CN111877789B - Construction method for integrally lifting, replacing and constructing new and old steel roof - Google Patents
Construction method for integrally lifting, replacing and constructing new and old steel roof Download PDFInfo
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- CN111877789B CN111877789B CN202010623291.5A CN202010623291A CN111877789B CN 111877789 B CN111877789 B CN 111877789B CN 202010623291 A CN202010623291 A CN 202010623291A CN 111877789 B CN111877789 B CN 111877789B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/06—Separating, lifting, removing of buildings; Making a new sub-structure
- E04G23/065—Lifting of buildings
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Abstract
The invention discloses a construction method for integrally lifting, replacing and constructing a new and old steel roof, which mainly comprises the following steps: integrally assembling the new steel roof on an assembling jig frame right below the old steel roof; arranging an integral lifting system; lifting the new steel roof to the bottom of the old steel roof by using a lifting system; arranging a plurality of section steel supports; removing the connection between the old steel roof and the peripheral permanent structure; lifting the new steel roof and the old steel roof together to lift the new steel roof to a designed elevation; fixing the new steel roof; and cutting and disassembling the old steel roof on an operation platform provided by the new steel roof. The construction method is less influenced by weather factors, has low requirement on the crane and fully protects the internal building structure in construction; in addition, the new steel roof provides a safe operation platform for the old steel roof dismantling work, the safety problem of high-altitude operation is solved, the dismantling difficulty of the old steel roof is reduced, a plurality of working surfaces can be constructed simultaneously, and the construction efficiency is effectively improved.
Description
Technical Field
The invention relates to a construction method for integrally lifting and replacing a new and old steel roof, belonging to the technical field of construction of building steel structures.
Background
Along with the continuous deep development of cities, the transformation and the updating of the existing buildings are more and more emphasized. Especially, steel structure building easily causes problems such as steel member corrosion, and along with steel structure building service life's continuous growth, these problems are outstanding day by day, and serious will influence whole structure safety. For this reason, in the renovation of old building steel structures, it is often necessary to perform safety checks and evaluations on existing steel structures and to perform corresponding reinforcements or replacements. For serious problems, even after the entire assembly has been removed and rebuilt.
The integral dismantling and rebuilding of large space steel roofs is a complex and high risk task. The traditional steel roof dismantling and rebuilding method is to dismantle the old roof and then build a new roof. At present, the common dismantling method of the steel roof has the following problems:
1. and arranging a temporary support group (or a full support), integrally supporting the old steel roof needing to be dismantled, then cutting the old steel roof, and adopting a crane to hoist in sections. The method needs to arrange a large number of temporary support groups, and if the steel roof is high above the ground, the temporary support consumption is large, which is time-consuming and expensive. And the large amount of temporary support weight puts additional demands on the bearing capacity of the substructure, and if the bearing capacity of the substructure of the temporary support group cannot be met, the substructure needs to be reinforced.
2. The old steel roof that utilizes whole lifting technology will need to demolish wholly transfers to ground, then demolishs old steel roof subaerial. The method needs to evaluate whether the bearing capacity of the old steel roof structure meets the requirements of overall descending stress and deformation, the old steel roof structure which needs to be integrally dismantled and rebuilt is generally seriously damaged, and in order to avoid serious safety accidents that may collapse in the overall descending process, the structure needs to be reinforced, so that the construction time and the construction cost are increased.
In addition, in both of the two dismantling methods, the old steel roof is dismantled firstly, and then a new steel roof is constructed, so that the internal structure of the building is exposed in the construction process, and the internal structure of the building can be damaged if the building meets severe weather such as heavy rain.
Disclosure of Invention
The invention provides a construction method for integrally lifting and replacing a new steel roof, which aims at the problems that the time and the expense are wasted, the internal structure of a building is possibly damaged in severe weather and the like in the construction of the method for integrally removing and rebuilding a large-space steel roof by removing an old roof firstly and then building a new roof.
In order to solve the technical problems, the invention comprises the following technical scheme:
a construction method for integrally lifting, replacing and constructing new and old steel roofs comprises the following steps:
step one, arranging an assembling jig frame under an old steel roof to be disassembled, and integrally assembling a new steel roof on the assembling jig frame; after the new steel roof is integrally assembled, an isolation protection device is laid on the new steel roof;
step two, arranging an integral lifting system, wherein the integral lifting system comprises a lifting support, a lifting power mechanism and a computer control system; the lifting support is arranged on a permanent structure at the periphery of the old steel roof or/and a temporary tower column support arranged in a span of a building structure; the lifting power mechanism is arranged on the lifting bracket; the computer control system is used for controlling the lifting power mechanism;
step three, after trial lifting and inspection are qualified, the computer control system controls a lifting power mechanism to enable the new steel roof to be lifted to the bottom of the old steel roof; temporarily fixing the periphery of the new steel roof;
step four, arranging a plurality of section steel supports between the new steel roof and the old steel roof, and integrally supporting the old steel roof by using the new steel roof to integrate the new steel roof and the old steel roof;
step five, removing the connection between the old steel roof and the peripheral permanent structure, and completely supporting the old steel roof on the new steel roof;
step six, removing the temporary fixation of the periphery of the new steel roof, lifting the new steel roof and the old steel roof together, and lifting the new steel roof to the designed elevation;
step seven, finishing the fixed connection of the new steel roof and the peripheral permanent structure;
eighthly, cutting and disassembling the old steel roof on an operation platform provided by the new steel roof, and removing the cut old steel roof component by using a crane to finish the removal work of the old steel roof;
and step nine, the integral lifting system quits working and is dismantled.
Furthermore, the lifting power mechanism comprises a plurality of through hydraulic jacks and steel strands, the through hydraulic jacks are arranged on the lifting support, one end of each steel strand is connected with the through hydraulic jack, and the other end of each steel strand is connected with the new steel roof; the feed-through hydraulic jack realizes self-locking and unlocking by utilizing the anchor sheet;
in the third step, the computer control system controls the anchor sheet of the through hydraulic jack to realize self-locking, so that the new steel roof is in a hovering state in the air;
and in the sixth step, before the new steel roof and the old steel roof are lifted together, the computer control system controls the anchor sheet of the through hydraulic jack to unlock.
The invention also provides another construction method, wherein the construction sequence of the sixth step to the eighth step is adjusted as follows:
sixthly, cutting and disassembling the old steel roof on an operation platform provided by the new steel roof, and removing the cut old steel roof component by using a crane to finish the removal work of the old steel roof;
seventhly, removing the temporary fixation of the periphery of the new steel roof, and controlling a lifting power mechanism by a computer control system to lift the new steel roof to the designed elevation;
and step eight, finishing the fixed connection of the new steel roof and the peripheral permanent structure.
Furthermore, the lifting power mechanism comprises a plurality of through hydraulic jacks and steel strands, the through hydraulic jacks are arranged on the lifting support, one end of each steel strand is connected with the through hydraulic jack, and the other end of each steel strand is connected with the new steel roof; the feed-through hydraulic jack realizes self-locking and unlocking by utilizing the anchor sheet;
in the third step, the computer control system controls the anchor sheet of the through hydraulic jack to realize self-locking, so that the new steel roof is in a hovering state in the air;
and seventhly, before the lifting operation of the new steel roof, the computer control system controls the anchor sheet of the through hydraulic jack to unlock.
Furthermore, the lifting power mechanism comprises a plurality of through hydraulic jacks and steel strands, the through hydraulic jacks are arranged on the lifting support, one end of each steel strand is connected with the through hydraulic jack, and the other end of each steel strand is connected with the new steel roof.
Further, the center-penetrating hydraulic jack realizes self-locking and unlocking by utilizing the anchor sheet;
in the third step, the computer control system controls the anchor sheet of the through hydraulic jack to realize self-locking, so that the new steel roof is suspended in the air;
and in the sixth step, before the new steel roof and the old steel roof are lifted together, the computer control system controls the anchor sheet of the through hydraulic jack to unlock.
And further, in the fifth step, removing the connection between the old steel roof and the peripheral permanent structure, and specifically, removing the steel members at the connection between the old steel roof and the peripheral permanent structure by adopting an oxygen-acetylene gas cutting or mechanical cutting method.
Further, calculation and analysis of the whole lifting process of the new and old steel roof are carried out before construction, and the lifting capacity of the whole lifting system meets the requirement; the number of the lifting power mechanisms is distributed according to the required maximum lifting force; according to the maximum allowable deformation of the new steel structure, the position of a lifting power mechanism is arranged;
when the calculation analysis shows that the self-structure safety can not be met in the construction process, structural reinforcement is required, or temporary tower column supports are arranged in the structural span, so that the number of lifting points in the new steel roof span is increased.
Further, the isolation protection device is a compression-molded steel plate or a safety operation scaffold walkway plate.
Further, make new steel roof promote to the design elevation in step six, include the step of carrying out automatic accurate adjustment to new steel roof elevation, specifically include:
a plurality of measurement control points are arranged on a new steel roof in advance; the new steel roof is roughly lifted to the designed elevation, the coordinates of each control point are measured by a total station, and the measured data are automatically transmitted to a computer; the computer compares the measured data with theoretical coordinates of each control point and calculates a difference value, and the computer control system controls a corresponding lifting power mechanism to realize fine adjustment and eliminate the difference value or limit the difference value in an allowable range according to the difference value; the lifting power mechanism is locked, and the accurate adjustment of the new steel roof is completed.
And further, in the third step, the stress and the deformation of the lifting system and the new steel roof are monitored in real time in the lifting process, and when the stress or the deformation exceeds a set safety value, the lifting system automatically alarms and stops working.
Furthermore, a stress acquisition device is arranged at a key stress node on the new steel roof.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
(1) the new steel roof is assembled on the ground by the crane, so that the safety risk is small, the requirement on hoisting machinery is low, and in addition, when the new steel roof is assembled, because the old steel roof is not disassembled, the construction can not be influenced by wind and rain, the all-weather construction can be realized, the working environment is favorable for high-altitude installation, the efficiency is high, and the construction period is quick; and when the old steel roof is disassembled, the new steel roof is installed, and the internal building structure is not exposed in the whole construction process, so that the weather adaptability is strong, and the internal building structure can be fully protected.
(2) After the new steel roof is lifted in place and fixed, the old steel roof is dismantled from the new steel roof, the new steel roof provides a safe operation platform for the dismantling work of the old steel roof, the safety problem of high-altitude operation is solved, the dismantling difficulty of the old steel roof is reduced, a plurality of working surfaces can be constructed simultaneously, and the construction efficiency is effectively improved; because old steel roof can cut into the steel member of arbitrary size as required, can adopt hoisting machinery to hang and remove, effectively reduced the requirement of hoist, practice thrift the cost.
Drawings
Fig. 1 to 10 are schematic flow charts of a construction method for integrally lifting and replacing a new and old steel roof.
The numbers in the figures are as follows:
1-old steel roof; 2-peripheral permanent structure; 3-assembling a jig frame; 4-new steel roof; 5-a crane; 6-isolation protection device; 7-lifting the support; 8-lifting the power mechanism; 81-straight-through hydraulic jack; 82-steel strand wires; 9-a computer control system; 10-temporary tower column; 11-a steel wire rope; 12-supporting the section steel; 13-peripheral members.
Detailed Description
The construction method for integrally lifting and replacing the new and old steel roof provided by the invention is further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent in conjunction with the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
With reference to fig. 1 to 10, the construction method for integrally lifting and replacing the new and old steel roof provided by the present embodiment includes the following steps:
step one, as shown in figure 1, arranging an assembling jig frame 3 under an old steel roof 1 to be disassembled, and integrally assembling a new steel roof 4 on the assembling jig frame 3; after the new steel roof 4 is integrally assembled, the isolation protection device 6 is laid on the new steel roof 4.
For large space steel structure building, old steel roof 1 provides the support through the peripheral permanent structure 2 of building, and peripheral permanent structure 2 can be the structural column, and old steel roof 1 has the characteristics that the span is big, weight is big.
And a crane 5 is adopted for auxiliary construction in the integral assembly of the new steel roof 4. The orthographic projection area of the main body structure of the new steel roof 4 is smaller than that of the old steel roof 1, so that the new steel roof 4 can be lifted inside the peripheral permanent structure 2 below the old steel roof 1. The new steel roof 4 is finally formed by providing peripheral members around the main structure of the new steel roof 4 in a subsequent step.
Keep apart protector 6 and form the protective layer on new steel roof 4, prevent that the thing that weighs down appears in the work progress and damage new steel roof 4, can also provide constructor simultaneously and provide safe operation platform. The isolation guard 6 may be a profiled steel sheet or a safety operating scaffold walkway plate.
Step two, as shown in fig. 2, an integral lifting system is arranged, and the integral lifting system comprises a lifting support 7, a lifting power mechanism 8 and a computer control system 9; the lifting support 7 is arranged on the peripheral permanent structure 2 of the old steel roof 1 or/and a temporary tower column support 10 arranged in a building structure span; the lifting power mechanism 8 is arranged on the lifting bracket 7; the computer control system 9 is used to control the lifting power mechanism 8.
Before construction, calculation and analysis of the whole lifting process of the new and old steel roof are carried out, and the lifting capacity of the whole lifting system is required to meet the requirement; the number of the lifting power mechanisms 8 is distributed according to the required maximum lifting force; and arranging the position of the lifting power mechanism 8 according to the maximum allowable deformation of the new steel structure. When the calculation analysis shows that the self-structure safety can not be met in the construction process, structural reinforcement is required, or a temporary tower column support 10 is arranged in the structural span, so that the number of lifting points in the new steel roof 4 span is increased.
The lifting power mechanism 8 comprises a plurality of through hydraulic jacks 81 and steel strands 82, the through hydraulic jacks 81 are arranged on the lifting support 7, one end of each steel strand 82 is connected with the through hydraulic jack 81, and the other end of each steel strand 82 is connected with the new steel roof 4. The feed-through hydraulic jack is mainly used for tensioning the whole group anchor, and in the embodiment, the feed-through hydraulic jack is used for lifting the whole old steel roof 1, and can be realized by adopting the prior art without expanding description. Of course, the lifting power mechanism 8 may also be in the form of an electric hoist, a winch, or the like. Promote support 7 and include the horizontal pole that supports through the montant, the one end setting of encorbelmenting of horizontal pole, the vertical setting of punching hydraulic jack is at the end of encorbelmenting of horizontal pole, conveniently promotes the steel strand wires.
Step three, as shown in fig. 3, after trial lifting and qualification inspection, the computer control system 9 controls the lifting power mechanism 8 to lift the new steel roof 4 to the bottom of the old steel roof; as shown in fig. 4, the new steel roof 4 is temporarily fixed around it.
The computer control system 9 controls the lifting of the straight-through hydraulic jack or the lifting of the electric hoist or the lifting of the winch, which can be realized by the prior art, and the specific structure and the working principle of the hydraulic jack are not described.
The computer control system 9 controls the anchor sheet of the through hydraulic jack 81 to realize self-locking, so that the new steel roof 4 hovers in the air. The periphery of the new steel roof 4 is reliably tied with the peripheral permanent structure 2 by adopting the steel wire ropes 11, so that the shaking is avoided. The new steel roof 4 relies primarily on the steel strands 82 to provide vertical support.
After the new steel roof 4 is lifted, the assembling jig frame 3 can be disassembled.
In order to ensure the safety and controllability of the whole lifting process, a remote automatic monitoring system can be arranged to monitor the stress and deformation of the lifting system and the new steel roof in real time, and a stress acquisition device is arranged at a key stress node on the new steel roof. The stress acquisition device can adopt a strain gauge or a strain gauge to acquire data, and the deformation monitoring can adopt a total station to measure in real time. When the stress or the deformation exceeds a set safety value, the lifting system automatically alarms and stops working, and safety is ensured.
Step four, as shown in fig. 5, a plurality of section steel brackets 12 are arranged between the new steel roof 4 and the old steel roof 1, and the new steel roof 4 is used to integrally support the old steel roof 1, so that the new steel roof 4 and the old steel roof 1 are integrated.
The steel section support 12 is arranged, and mainly aims to enable a certain distance to be formed between the new steel roof 4 and the old steel roof 1 in the disassembling and dismantling construction of the old steel roof 1, so that the new steel roof 4 is prevented from being influenced by oxygen cutting in the disassembling construction.
The new steel roof 4 and the old steel roof 1 are integrated together, so as to meet the construction safety when the new steel roof 4 and the old steel roof 1 are lifted together, for example, the upper and lower ends of some or all of the section steel brackets 12 can be respectively and fixedly connected with the new steel roof 4 and the old steel roof 1 through bolts or welding.
And step five, as shown in fig. 6, removing the connection between the old steel roof 1 and the peripheral permanent structure 2, so that the old steel roof 1 is completely supported on the new steel roof 4.
The connection between the old steel roof and the peripheral permanent structure is removed, and particularly, a steel member at the connection position between the old steel roof and the peripheral permanent structure can be removed by adopting an oxygen-acetylene gas cutting or mechanical cutting method.
After the connection between the old steel roof 1 and the peripheral permanent structure 2 is removed, the gravity of the old steel roof 1 is completely transmitted to the new steel roof 4 through the section steel support bracket 12, so that when the calculation and analysis of the whole lifting process of the new and old steel roof are carried out before construction, factors such as the new steel roof, the old steel roof, the section steel support bracket, an isolation protection device, dynamic load in the construction process and the like need to be considered, and a certain safety factor is considered.
Sixthly, as shown in fig. 7, the temporary fixation of the periphery of the new steel roof 4 is released, the new steel roof 4 and the old steel roof 1 are lifted together, and the new steel roof 4 is lifted to the designed elevation.
Before the new steel roof 4 and the old steel roof 1 are lifted, the computer control system 9 controls the anchor sheet of the through hydraulic jack 81 to realize unlocking.
Make new steel roof 4 promote to the design elevation, include the step of carrying out automatic accurate adjustment to new steel roof elevation, specifically do: a plurality of measurement control points are arranged on a new steel roof in advance; the new steel roof 4 is roughly lifted to the designed elevation, the coordinates of each control point are measured by a total station, and the measured data are automatically transmitted to a computer; the computer compares the measured data with theoretical coordinates of each control point and calculates a difference value, the computer control system 9 controls the corresponding lifting power mechanism 8 to realize fine adjustment and eliminate the difference value or limit the difference value within an allowable range according to the difference value, and then the lifting power mechanism 8 is locked to finish the accurate adjustment of the new steel roof.
And seventhly, as shown in fig. 8, finishing the fixed connection of the new steel roof 4 structure and the peripheral permanent structure 2.
In order to facilitate lifting, the size of the new steel roof 4 in construction is smaller than that after final forming, after the new steel roof 4 is hoisted in place, peripheral members 13 of the new steel roof 4 need to be supplemented, so that the new steel roof 4 is finally formed, and the new steel roof 4 which is finally formed is fixed on the peripheral permanent structure 2.
Step eight, as shown in fig. 9, cutting and disassembling the old steel roof 1 on an operation platform provided by the new steel roof, and hoisting the cut old steel roof 1 by using a crane 5 to finish the dismantling work of the old steel roof 1.
The new steel roof provides operation platform for the construction of old steel roof, and old steel roof can cut wantonly as required and demolish, and the component under the cutting adopts hoist (like the tower crane) to hang and removes, because the steel component can be cut into the smallclothes wantonly at the high altitude, has effectively reduced the requirement of hoist, practices thrift the cost.
Step nine, as shown in fig. 10, the entire lifting system is taken out of service and removed.
In summary, the construction method for integrally lifting and replacing the new and old steel roof provided by the embodiment includes the steps of firstly installing the new steel roof truss and then disassembling and dismantling the old steel roof truss, and compared with the prior art, the construction method has the following advantages:
(1) the new steel roof 4 is assembled on the ground by the crane 5, so that the safety risk is small, the mechanical requirement of the crane 5 is low, and the old steel roof is not yet disassembled when the new steel roof 4 is assembled, so that the construction can not be influenced by wind and rain, the all-weather construction can be realized, the high-altitude installation of the working environment is facilitated, the efficiency is high, and the construction period is quick; and when old steel roof 1 disintegrates the construction, new steel roof 4 has already been installed, in the whole work progress, the building structure of inside has not been exposed, to weather strong adaptability, the building structure of inside can fully be protected.
(2) After the new steel roof 4 is lifted in place and fixed, the old steel roof 1 is dismantled on the new steel roof 4, the new steel roof 4 provides a safe operating platform for the dismantling work of the old steel roof 1, the safety problem of high-altitude operation is solved, the dismantling difficulty of the old steel roof 1 is reduced, a plurality of working surfaces can be constructed simultaneously, and the construction efficiency is effectively improved; because old steel roof 1 can cut into the steel member of arbitrary size as required, can adopt 5 machinery of hoist to hang and remove, effectively reduced 5 requirements of hoist, practice thrift the cost.
Example two
The difference between the present embodiment and the first embodiment is that the construction sequence of the sixth step to the eighth step in the first embodiment is adjusted. The specific adjustment is as follows:
sixthly, cutting and disassembling the old steel roof on an operation platform provided by the new steel roof, and removing the cut old steel roof component by using a crane to finish the removal work of the old steel roof;
seventhly, removing the temporary fixation of the periphery of the new steel roof, and controlling a lifting power mechanism by a computer control system to lift the new steel roof to the designed elevation;
and step eight, finishing the fixed connection of the new steel roof and the peripheral permanent structure.
It can be seen that step six of this embodiment is based on step five, demolish old steel roof on new steel roof first, then lift new steel roof to design elevation alone again, and realize that new steel roof is fixed.
Furthermore, the lifting power mechanism comprises a plurality of through hydraulic jacks and steel strands, the through hydraulic jacks are arranged on the lifting support, one end of each steel strand is connected with the through hydraulic jack, and the other end of each steel strand is connected with the new steel roof; the feed-through hydraulic jack realizes self-locking and unlocking by utilizing the anchor sheet;
in the third step, the computer control system controls the anchor sheet of the through hydraulic jack to realize self-locking, so that the new steel roof is in a hovering state in the air;
and seventhly, before the lifting operation of the new steel roof, the computer control system controls the anchor sheet of the through hydraulic jack to unlock.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A construction method for integrally lifting, replacing and constructing new and old steel roofs is characterized by comprising the following steps:
step one, arranging an assembling jig frame under an old steel roof to be disassembled, and integrally assembling a new steel roof on the assembling jig frame; after the new steel roof is integrally assembled, an isolation protection device is laid on the new steel roof;
step two, arranging an integral lifting system, wherein the integral lifting system comprises a lifting support, a lifting power mechanism and a computer control system; the lifting support is arranged on a permanent structure at the periphery of the old steel roof or/and a temporary tower column support arranged in a span of a building structure; the lifting power mechanism is arranged on the lifting bracket; the computer control system is used for controlling the lifting power mechanism;
step three, after trial lifting and inspection are qualified, the computer control system controls a lifting power mechanism to enable the new steel roof to be lifted to the bottom of the old steel roof; temporarily fixing the periphery of the new steel roof;
step four, arranging a plurality of section steel supports between the new steel roof and the old steel roof, and integrally supporting the old steel roof by using the new steel roof to integrate the new steel roof and the old steel roof;
step five, removing the connection between the old steel roof and the peripheral permanent structure, and completely supporting the old steel roof on the new steel roof;
step six, removing the temporary fixation of the periphery of the new steel roof, lifting the new steel roof and the old steel roof together, and lifting the new steel roof to the designed elevation;
step seven, finishing the fixed connection of the new steel roof and the peripheral permanent structure;
eighthly, cutting and disassembling the old steel roof on an operation platform provided by the new steel roof, and removing the cut old steel roof component by using a crane to finish the removal work of the old steel roof;
and step nine, the integral lifting system quits working and is dismantled.
2. The construction method according to claim 1,
the lifting power mechanism comprises a plurality of through hydraulic jacks and steel strands, the through hydraulic jacks are arranged on the lifting support, one ends of the steel strands are connected with the through hydraulic jacks, and the other ends of the steel strands are connected with the new steel roof; the feed-through hydraulic jack realizes self-locking and unlocking by utilizing the anchor sheet;
in the third step, the computer control system controls the anchor sheet of the through hydraulic jack to realize self-locking, so that the new steel roof is in a hovering state in the air;
and in the sixth step, before the new steel roof and the old steel roof are lifted together, the computer control system controls the anchor sheet of the through hydraulic jack to unlock.
3. The construction method as claimed in claim 1, wherein the construction sequence of the sixth to eighth steps is adjusted to:
sixthly, cutting and disassembling the old steel roof on an operation platform provided by the new steel roof, and removing the cut old steel roof component by using a crane to finish the removal work of the old steel roof;
seventhly, removing the temporary fixation of the periphery of the new steel roof, and controlling a lifting power mechanism by a computer control system to lift the new steel roof to the designed elevation;
and step eight, finishing the fixed connection of the new steel roof and the peripheral permanent structure.
4. The construction method according to claim 3,
the lifting power mechanism comprises a plurality of through hydraulic jacks and steel strands, the through hydraulic jacks are arranged on the lifting support, one ends of the steel strands are connected with the through hydraulic jacks, and the other ends of the steel strands are connected with the new steel roof; the feed-through hydraulic jack realizes self-locking and unlocking by utilizing the anchor sheet;
in the third step, the computer control system controls the anchor sheet of the through hydraulic jack to realize self-locking, so that the new steel roof is in a hovering state in the air;
and seventhly, before the lifting operation of the new steel roof, the computer control system controls the anchor sheet of the through hydraulic jack to unlock.
5. The construction method according to any one of the claims 1 to 4, wherein in the fifth step, the connection between the old steel roof and the peripheral permanent structure is removed, and the steel members at the connection between the old steel roof and the peripheral permanent structure are removed by means of oxygen-acetylene gas cutting or mechanical cutting.
6. The construction method according to any one of claims 1 or 2,
before construction, calculation and analysis of the whole lifting process of the new and old steel roof are carried out, and the lifting capacity of the whole lifting system is required to meet the requirement; the number of the lifting power mechanisms is distributed according to the required maximum lifting force; according to the maximum allowable deformation of the new steel structure, the position of a lifting power mechanism is arranged;
when the calculation analysis shows that the self-structure safety can not be met in the construction process, structural reinforcement is required, or temporary tower column supports are arranged in the structural span, so that the number of lifting points in the new steel roof span is increased.
7. The construction method according to any one of claims 1 to 4, wherein the insulation shield is a profiled steel sheet or a safety-operated scaffold board.
8. The construction method according to any one of claims 1 or 2, wherein the sixth step of raising the new steel roof to a design elevation comprises the step of automatically and precisely adjusting the elevation of the new steel roof, and specifically comprises the following steps:
a plurality of measurement control points are arranged on a new steel roof in advance; the new steel roof is roughly lifted to the designed elevation, the coordinates of each control point are measured by a total station, and the measured data are automatically transmitted to a computer; the computer compares the measured data with theoretical coordinates of each control point and calculates a difference value, and the computer control system controls a corresponding lifting power mechanism to realize fine adjustment and eliminate the difference value or limit the difference value in an allowable range according to the difference value; the lifting power mechanism is locked, and the accurate adjustment of the new steel roof is completed.
9. The construction method according to any one of claims 1 to 4, wherein in the third step, the stress and deformation of the lifting system and the new steel roof during the lifting process are monitored in real time, and when the stress or deformation exceeds a set safety value, the lifting system automatically alarms and stops working.
10. The construction method according to claim 9, wherein a stress collecting device is arranged at a key stress node on the new steel roof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010623291.5A CN111877789B (en) | 2020-07-01 | 2020-07-01 | Construction method for integrally lifting, replacing and constructing new and old steel roof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010623291.5A CN111877789B (en) | 2020-07-01 | 2020-07-01 | Construction method for integrally lifting, replacing and constructing new and old steel roof |
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