Scaffold and method for reconstruction and repair construction of external facade of old cultural relic building

Abstract

The invention discloses a scaffold and a method for reconstruction and repair construction of an external facade of an old cultural relic building, and belongs to the technical field of design and manufacturing of technological equipment for reconstruction and repair construction of constructional engineering. According to the scaffold and the method, internal stress can be remarkably reduced, and building damage can be effectively avoided. The scaffold comprises a scaffold body, the scaffold body is arranged on the outer side of an old building and / or a cultural relic building needing to be transformed and / or repaired in the circumferential direction, the scaffold further comprises a flexible unbonded prestress stabilizing system, and the flexible unbonded prestress stabilizing system at least comprises a protection assembly and a binding tensioning stabilizing mechanism. The scaffold body erected on the outer side of the old building and / or the cultural relic building is reinforced and kept stable through the binding, tensioning and stabilizing mechanism under the cooperation of an external corresponding foundation, and the side faces, connected with the old building and / or the cultural relic building in an abutting or attaching mode, of the scaffold body are connected to the protection assemblies in a cushioned mode.

Description

Technical Field

[0001] The present invention relates to a scaffold, in particular to a scaffold used for renovation and restoration of the facade of an old cultural relic building, belonging to the technical field of design and manufacturing of construction equipment for renovation and restoration of construction projects. The present invention also relates to a construction method for erecting the scaffold used for renovation and restoration of the facade of an old cultural relic building. Background Art

[0002] At present, scaffolding is often used in construction projects, especially for building facade renovation. In order to ensure the overall rigidity and stability of the scaffolding, the scaffolding is generally rigidly connected to the main building with wall ties. This method will increase the internal stress of the entire scaffolding system after the scaffolding is loaded, which is not conducive to the overall stability of the scaffolding. At the same time, it will cause certain damage to the main structure of the building, especially for old buildings or cultural relics.

[0003] The invention patent with the publication number CN100441782C and the invention name "New prestressed scaffolding system" uses supporting components, piles, beams, steel bar bundles, etc. to form a prestressed system, which is mainly used for underground engineering construction and is not suitable for ground construction projects. The invention patent with the publication number CN117489090A and the invention name "A scaffolding fixture" uses a wall connection seat fixed on the building structure. The wall connection seat can move up and down, but it uses rigid components. After the load is applied, the internal force of the scaffolding system will increase, which is not conducive to the overall stability of the scaffolding and will cause certain damage to the main structure of the building. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a scaffold for renovation and repair of the facades of old cultural relic buildings, which can significantly reduce internal stress and effectively avoid damage to the building, and a construction method for erecting the scaffold for renovation and repair of the facades of old cultural relic buildings.

[0005] The technical solution adopted to solve the above-mentioned technical problems is: a scaffold used for the renovation and restoration construction of the facades of old cultural relic buildings, comprising a scaffold body, the scaffold body is erected circumferentially on the outside of the old building and / or cultural relic building that needs to be renovated and / or repaired, the scaffold also includes a flexible non-bonded prestressed stabilization system, the flexible non-bonded prestressed stabilization system at least includes a protective component and a binding and tensioning stabilization mechanism, the scaffold body erected on the outside of the old building and / or cultural relic building is reinforced and kept stable by the binding and tensioning stabilization mechanism with the cooperation of the corresponding external foundation, and the sides where the scaffold body is top-jointed or attached to the old building and / or cultural relic building are padded with the protective components.

[0006] Furthermore, the corresponding external foundation is other buildings or structures that are suitable for the location of the old building and / or the cultural relic building, or the inner wall of the old building and / or the cultural relic building where windows or door openings are opened; the protective component at least includes rubber pads, and the contact points between the scaffolding body and the outer wall of the old building and / or the cultural relic building are respectively padded with rubber pads.

[0007] The preferred embodiment of the above scheme is that the binding tensioning and stabilizing mechanism comprises at least a tensioning drive assembly and unbonded prestressed stirrups, and at least two groups of unbonded prestressed stirrups are arranged vertically on the scaffolding body at intervals from each other, and each group of unbonded prestressed stirrups is tensioned by a set of tensioning drive assemblies and is detachably fixedly connected to a corresponding external foundation.

[0008] Furthermore, each group of unbonded prestressed stirrups is composed of a flexible steel wire rope, and each set of tensioning drive components includes at least one tensioner and two groups of fixed support structures. The anchoring end of the flexible steel wire rope is detachably arranged on a corresponding external foundation through a group of fixed support structures, and the tensioning end of the flexible steel wire rope can be tightened or loosened and arranged on a corresponding external foundation through the tensioner with the cooperation of another group of fixed support structures.

[0009] The preferred embodiment of the above scheme is that each set of tensioning drive components also includes a back rib support steel, each set of fixed structures includes a set of anchors, a gasket and a pair of clamps, the tensioner is composed of a set of hydraulic jacks, two mounting holes are provided on the back rib support steel, the anchor end of the flexible steel wire rope is detachably fixed in one mounting hole of the back rib support steel through the anchor, gasket and clamp, the hydraulic jack of the flexible steel wire rope can be tightened or loosened and fixed in another mounting hole of the back rib support steel through the tensioner with the cooperation of the anchor, gasket and clamp, and the back of the back rib support steel is connected to the corresponding external foundation.

[0010] Furthermore, the flexible non-bonded prestressed stabilization system also includes a limiting hook, and the binding and tensioning stabilization mechanism also includes a supporting pad ring. Each flexible steel wire rope is located at each corner of the scaffolding body and is supported and tied to the scaffolding body through a set of supporting pad rings; the flexible steel wire rope between two adjacent supporting pad rings is respectively maintained in straightness by at least one limiting hook hung on the scaffolding body at the upper end.

[0011] The preferred embodiment of the above scheme is that each set of supporting pad rings respectively includes a pulley and a set of rolling bearings, and each pulley is respectively provided with a wire groove. Each pulley is movably arranged on the scaffolding body at a corresponding position through the corresponding rolling bearings, and the flexible steel wire rope at the corner is bridged in the corresponding wire groove. The binding tensioning and stabilizing mechanism also includes a tensioning platform, and at least the hydraulic drive component of the hydraulic jack is arranged on the tensioning platform.

[0012] The invention discloses a construction method for erecting a scaffold for renovation and restoration of the facade of an old cultural relic building, the construction method comprising determining the number of sets of unbonded prestressed stirrups to be provided based on calculation, determining the arrangement position of the tensioning drive assembly based on the situation of the building to be renovated or repaired, erecting the scaffold body in sections and layers, arranging the flexible unbonded prestressed stabilization system in sections and layers, and tensioning and fixing the scaffold body until the erection of the entire scaffold body is completed.

[0013] Furthermore, when determining the number of sets of unbonded prestressed stirrups to be installed based on calculation, the installation position and tensioning force of each flexible steel wire rope are determined; when determining the layout position of the tensioning drive assembly based on the situation of the building to be renovated or repaired, it is also determined whether the tensioning end and the anchoring end of each flexible steel wire rope are to be separately installed or centrally installed;

[0014] When erecting the scaffolding body, rubber pads are installed at the ends of the transverse horizontal bars inside the scaffolding body; supporting pad rings are provided on the outermost vertical bars and the vertical bars at the corners of the scaffolding body.

[0015] The preferred method of the above scheme is that the flexible non-bonded prestressed stabilization system is arranged layer by layer and tensioned and fixed according to the following steps:

[0016] 1) Installation of support components: setting up a tensioning platform on the selected corresponding foundation, and installing back rib support steel on the tensioning platform;

[0017] 2) Installation of unbonded prestressed stirrups: along the previously designed prestressed position, set a limit hook on the longitudinal horizontal rod just above the unbonded prestressed stirrup laying path, and lay the unbonded prestressed stirrups on the limit hook. The hanging position of the limit hook must ensure that the unbonded prestressed stirrups and the supporting liner ring are on the same horizontal plane. The unbonded prestressed stirrups are laid along the limit hook and the supporting liner ring. The unbonded prestressed stirrups must completely cover the scaffolding body to be reinforced;

[0018] 3) Install the tensioning end and anchoring end of the flexible steel wire rope. The anchors include tool anchors and working anchors according to their uses. Install gaskets, tool anchors and clamps on the anchoring end in sequence and temporarily fix them on the back rib support steel; install gaskets, working anchors, clamps, hydraulic jacks and tool anchors on the tensioning end in sequence. All components on the tensioning end and anchoring end must be perpendicular to the unbonded prestressed tendons;

[0019] 4) Prestressing: After checking the scaffolding body, unbonded prestressed stirrups, support pad rings, and rubber pads, operate the hydraulic jack to apply prestress and finally anchor according to the unbonded prestressing construction process, and then remove the hydraulic jack, tensioning end tool anchor and its clamp;

[0020] 5) Continue to erect the scaffolding body to the position of the unbonded prestressed stirrups of the previous layer, and apply prestress according to the above process;

[0021] 6) When dismantling the scaffolding, it should be dismantled from top to bottom; when dismantling the unbonded prestressed stirrups, first remove a vertical pole at the specified position to loosen the unbonded prestressed tendons, then remove the other components of the binding tensioning and stabilizing mechanism, and recycle the various components of the binding tensioning and stabilizing mechanism, thus completing the construction of the scaffolding body and its unbonded prestressed reinforcement.

[0022] The beneficial effects of the present invention are as follows: the technical solution provided in the present application is based on the existing scaffolding body, and combined with the structural characteristics that the scaffolding body is erected circumferentially on the outside of old buildings and / or cultural relics buildings that need to be renovated and / or repaired, the scaffolding of the present application is formed by adding a flexible non-bonded prestressed stabilization system, and the flexible non-bonded prestressed stabilization system is set to a structure that at least includes a protective component and a binding and tensioning stabilization mechanism, and then the scaffolding body erected on the outside of the old building and / or cultural relics building is reinforced and kept stable by the binding and tensioning stabilization mechanism with the cooperation of the corresponding external foundation, and the outer sides of the scaffolding body and the old building and / or cultural relics building where they are top-jointed or attached are padded with the protective components. In this way, since the stability of the scaffolding body provided by the present application is guaranteed by the binding and tensioning stabilization mechanism with the cooperation of the corresponding external foundation, the problem of internal stress after the scaffolding body rigidly connected to the building wall through the wall connecting parts is solved, which not only effectively reduces the structural instability problem caused by the increase of internal stress of the scaffolding body, but also because the scaffolding body of the present application is reinforced by the binding and tensioning stabilization mechanism, not only the scaffolding body is strengthened, but also its connection with the external foundation is increased, thereby significantly reducing the internal stress. At the same time, since the scaffolding body of the present application itself is not directly connected to the building, and at the same time, the contact between the scaffolding body and the building is also padded with protective components, it can also effectively avoid damage to the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of a scaffold used for the renovation and restoration of the facade of an old cultural relic building according to the present invention;

[0024] Figure 2 It is a structural schematic diagram of the scaffolding body and the building wall and the installation of the support pad ring involved in the scaffolding used for the renovation and restoration of the facade of an old cultural relic building of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a tensioning drive assembly involved in a scaffold used for renovation and restoration of the facade of an old cultural relic building according to the present invention;

[0026] Figure 4 , Figure 5A detailed diagram of fixing both ends of a flexible steel wire rope involved in a scaffold used in the renovation and restoration construction of an old cultural relic building facade according to the present invention;

[0027] Figure 6 The present invention is a detailed drawing of a support cushion ring involved in a scaffold used for renovation and restoration of the facade of an old cultural relic building.

[0028] Marked in the figure are: rubber support pad 1, unbonded prestressed stirrups 2, tensioner 3, back rib support steel 4, anchor 5, gasket 6, clamp 7, limit hook 8, pulley 9, rolling bearing 10, tensioning platform 11, transverse horizontal rod 12, vertical rod 13, longitudinal horizontal rod 14, support pad ring 15, wire groove 16. DETAILED DESCRIPTION

[0029] like Figure 1 to Figure 6The scaffolding provided by the present invention can significantly reduce internal stress and effectively avoid damage to the building, and is used for the renovation and repair of the facade of an old cultural relic building. The scaffolding includes a scaffolding body, which is circumferentially erected on the outside of the old building and / or cultural relic building that needs to be renovated and / or repaired. The scaffolding also includes a flexible non-bonded prestressed stabilization system, which includes at least a protective component and a binding tensioning stabilization mechanism. The scaffolding body erected on the outside of the old building and / or cultural relic building is reinforced and kept stable by the binding tensioning stabilization mechanism with the cooperation of the corresponding external foundation, and the protective components are padded on the sides where the scaffolding body is top-jointed or attached to the old building and / or cultural relic building. The technical solution provided in the present application is based on the existing scaffolding body, and is combined with the structural characteristics of the scaffolding body being erected circumferentially on the outside of old buildings and / or cultural relics buildings that need to be renovated and / or repaired. The scaffolding of the present application is formed by adding a flexible non-bonded prestressed stabilization system, and the flexible non-bonded prestressed stabilization system is set to a structure that at least includes a protective component and a binding and tensioning stabilization mechanism. Then, the scaffolding body erected on the outside of the old buildings and / or cultural relics buildings is reinforced and kept stable by the binding and tensioning stabilization mechanism with the cooperation of the corresponding external foundation, and the outer sides of the scaffolding body and the old buildings and / or cultural relics buildings where they are top-jointed or attached are padded with the protective components. In this way, since the stability of the scaffolding body provided by the present application is guaranteed by the binding and tensioning stabilization mechanism with the cooperation of the corresponding external foundation, the problem of internal stress after the scaffolding body rigidly connected to the building wall through the wall connecting parts is solved, which not only effectively reduces the structural instability problem caused by the increase of internal stress of the scaffolding body, but also because the scaffolding body of the present application is reinforced by the binding and tensioning stabilization mechanism, not only the scaffolding body is strengthened, but also its connection with the external foundation is increased, thereby significantly reducing the internal stress. At the same time, since the scaffolding body of the present application itself is not directly connected to the building, and at the same time, the contact between the scaffolding body and the building is also padded with protective components, it can also effectively avoid damage to the building. In combination with the actual situation of the modification or renovation site, the corresponding foundation on the outside of the present application is preferably other buildings or structures that are suitable for the location of the old building and / or cultural relic building, or the inner wall of the old building and / or cultural relic building where windows or door openings are opened; when the building to be modified is a cultural relic building, the protective component should at least include rubber support pads 1, and rubber support pads 1 should be padded at the contact points between the scaffolding body and the outer wall of the old building and / or cultural relic building.

[0030] Accordingly, in order to maintain the stability of the scaffolding body as much as possible and reduce the internal stress, the binding tensioning and stabilizing mechanism of the present application at least includes a tensioning drive assembly and unbonded prestressed stirrups 2, and at least two groups of unbonded prestressed stirrups 2 are arranged vertically on the scaffolding body at intervals, and each group of unbonded prestressed stirrups 2 is tensioned and detachably fixedly connected to the corresponding external foundation through a set of tensioning drive assemblies. At this time, the preferred method is that each group of unbonded prestressed stirrups 2 is composed of a flexible steel wire rope, and each set of tensioning drive assemblies includes at least one tensioner 3 and two sets of fixed support structures. The anchoring end of the flexible steel wire rope is detachably arranged on the corresponding external foundation through a set of fixed support structures, and the tensioning end of the flexible steel wire rope can be arranged on the corresponding external foundation by tightening or loosening through the tensioner 3 with the cooperation of another set of fixed support structures.

[0031] Furthermore, the flexible non-bonded prestressed stabilization system also includes a limiting hook 8, and the binding and tensioning stabilization mechanism also includes a supporting pad ring 15. Each flexible steel wire rope is located at each corner of the scaffolding body and is supported and tied to the scaffolding body through a set of supporting pad rings 15; the flexible steel wire rope between two adjacent supporting pad rings 15 is respectively maintained in straightness by at least one limiting hook 8 hung on the scaffolding body at the upper end.

[0032] More specifically, each set of tensioning drive components also includes a back-rib support steel 4, each set of fixed structures includes a set of anchors 5, a gasket 6 and a pair of clamps 7, the tensioner 3 is composed of a set of hydraulic jacks, and two mounting holes are arranged on the back-rib support steel 4. The anchoring end of the flexible steel wire rope is detachably fixed in one mounting hole of the back-rib support steel 4 through the anchor 5, the gasket 6 and the clamp 7, and the tensioning end of the flexible steel wire rope can be tightened or loosened and fixed in the other mounting hole of the back-rib support steel 4 through the hydraulic jack with the cooperation of the anchor 5, the gasket 6 and the clamp 7. The back of the back-rib support steel 4 is connected to the corresponding external foundation. Each set of supporting pad rings 15 includes a pulley 9 and a set of rolling bearings 10, and each pulley 9 is provided with a wire groove 16. Each pulley 9 is movably arranged on the scaffolding body at the corresponding position through the corresponding rolling bearing 10. The flexible steel wire rope at the corner is bridged in the corresponding wire groove 16. The binding tensioning and stabilizing mechanism also includes a tensioning platform 11, and at least the hydraulic drive component of the hydraulic jack is arranged on the tensioning platform 11.

[0033] In this way, the present application can be carried out according to the following steps when setting up the scaffolding used for the renovation and restoration of the facade of the old cultural relic building, that is, determining the number of sets of unbonded prestressed stirrups required to be set according to calculation, determining the layout position of the tensioning drive assembly according to the situation of the building to be renovated or repaired, setting up the scaffolding body in sections and layers, and arranging the flexible unbonded prestressed stabilization system in sections and layers, and tensioning and fixing the scaffolding body until the entire scaffolding body is set up. And while determining the number of sets of unbonded prestressed stirrups required to be set according to calculation, determine the setting position and tensioning force of each flexible steel wire rope; when determining the layout position of the tensioning drive assembly according to the situation of the building to be renovated or repaired, determine whether the tensioning end and the anchoring end of each flexible steel wire rope are set separately or centrally; when setting up the scaffolding body, install the rubber pad 1 at the end of the horizontal horizontal rod 12 on the inner side of the scaffolding body; and set the support pad ring on the outermost vertical pole 13 of the scaffolding body and the vertical pole 13 at the corner.

[0034] In order to improve the binding effect of the flexible non-bonded prestressed stabilization system on the scaffold body, the flexible non-bonded prestressed stabilization system is set layer by layer and tensioned and fixed according to the following steps:

[0035] 1) Support component installation: set up a tensioning platform on the selected corresponding foundation, and install the back rib support steel 4 on the tensioning platform;

[0036] 2) Installation of unbonded prestressed stirrups: along the previously designed prestressed position, a limit hook 8 is set on the longitudinal horizontal rod 14 just above the unbonded prestressed stirrup laying path, and the unbonded prestressed stirrups are laid on the limit hook 8. The hanging position of the limit hook 8 must ensure that the unbonded prestressed stirrups and the supporting liner ring are on the same horizontal plane. The unbonded prestressed stirrups are laid along the limit hook 8 and the supporting liner ring. The unbonded prestressed stirrups must completely cover the scaffolding body to be reinforced;

[0037] 3) Install the tensioning end and anchoring end of the flexible steel wire rope. The anchors include tool anchors and working anchors according to their uses. Install the gasket 6, tool anchor and clamp 7 on the anchoring end in sequence and temporarily fix it on the back rib support steel 4; install the gasket 6, working anchor, clamp 7, hydraulic jack and tool anchor on the tensioning end in sequence. All components on the tensioning end and anchoring end must be perpendicular to the unbonded prestressed tendons;

[0038] 4) Apply prestressing force. After checking the scaffold body, unbonded prestressing stirrups, support pad rings, and rubber pads 1, operate the hydraulic jack to apply prestressing force and finally anchor it according to the unbonded prestressing construction process, and then remove the hydraulic jack, tensioning end tool anchor and its clamp 7;

[0039] 5) Continue to erect the scaffolding body to the position of the unbonded prestressed stirrups of the previous layer, and apply prestress according to the above process;

[0040] 6) When dismantling the scaffolding, it should be dismantled in a downward order; when dismantling the unbonded prestressed stirrups, first remove a vertical pole 13 at the specified position to loosen the unbonded prestressed tendons, then remove the other components of the binding tensioning and stabilizing mechanism, and recycle the various components of the binding tensioning and stabilizing mechanism, thus completing the construction of the scaffolding body and its unbonded prestressed reinforcement.

[0041] In summary, the technical solution provided by this application also has the following advantages:

[0042] 1. The rigid wall ties are eliminated, which prevents damage to the building structure. It is especially suitable for the renovation of old buildings and cultural relics buildings, avoiding the risk of rigid wall ties damaging the building.

[0043] 2. The rigid wall connecting parts of conventional scaffolding are eliminated, and the scaffolding is reinforced with non-bonded prestressed technology, which greatly reduces the internal stress of the scaffolding system and improves the overall stability and safety of the scaffolding.

[0044] 3. The positions of the tensioning ends and fixed ends of the unbonded prestressed tendons can be flexibly selected according to the characteristics of different building structures. The tensioning ends or fixed ends can even be set on other buildings or structures outside the construction building, which has strong applicability.

[0045] 4. Prestressing, anchoring and removal of prestressed tendons are simple, saving construction time.

[0046] 5. Components such as gasket rings, rubber pads, prestressed tendons, anchors, and clamps can be recycled, which helps reduce construction costs.

[0047] The technical solution of the present application is further described below through specific embodiments:

[0048] In view of the characteristics that various scaffolding systems will increase internal stress of the scaffolding after load is applied, which is not conducive to the overall stability of the scaffolding and will cause damage to the main structure of the building, the present invention organically combines the non-bonded prestressing technology with the scaffolding engineering and adopts a flexible component to reinforce the scaffolding. The purposes of the present invention are as follows:

[0049] 1. For the renovation of old buildings and cultural relics buildings, non-bonded prestressed steel is used to replace traditional rigid wall ties, which fundamentally prevents the damage of wall ties to the building structure and avoids the risk of rigid wall ties damaging old buildings or cultural relics buildings.

[0050] 2. Eliminate the rigid wall ties of conventional scaffolding and use non-bonded prestressed technology to reinforce the scaffolding, reduce the internal stress of the scaffolding system, and improve the overall stability and safety of the scaffolding.

[0051] 3. The tensioning end and fixed end positions of the unbonded prestressed tendons can be flexibly selected according to the characteristics of different building structures. The tensioning end or fixed end can even be set on other buildings or structures outside the construction building, which has strong applicability.

[0052] 4. Save construction time and costs to the maximum extent possible.

[0053] The overall technical solution adopted by the present invention is: to eliminate the traditional scaffolding wall connecting parts and adopt non-bonded prestressed reinforced scaffolding to ensure the stability and safety of the scaffolding, and fundamentally eliminate the damage caused by the wall connecting parts to the buildings (especially old buildings and cultural relics buildings).

[0054] The specific technical solutions are as follows:

[0055] 1. Set up a non-bonded prestressed system, and use non-bonded prestressed to constrain the scaffolding, prevent the scaffolding from deformation and lateral displacement, enhance the overall rigidity and stability of the scaffolding, and prevent the scaffolding from deformation, overturning and collapse. The non-bonded prestressed system consists of non-bonded prestressed tendons, tensioning ends, anchoring ends, anchors, clamps, etc. The non-bonded prestressed tendons are set at the outermost side of the scaffolding; the tensioning ends and anchoring ends can be set at appropriate indoor locations facing the door and window openings of the building, or set on other existing buildings and structures outdoors.

[0056] 2. As the scaffolding is erected to a certain height, the non-bonded prestressed system is installed to apply prestress; when the scaffolding is dismantled, the non-bonded prestressed system is dismantled simultaneously to ensure the stability and safety of the scaffolding.

[0057] 3. To prevent or reduce the loss of prestress during the tensioning process, a gasket ring is set at the outermost pole and corner of the scaffolding, and the unbonded prestressed tendons are clamped in the gasket ring. To reduce the sagging of the unbonded prestressed tendons due to their own gravity, a hook is set on the longitudinal horizontal rod of the scaffolding to restrain the vertical displacement of the unbonded prestressed tendons.

[0058] 4. In order to prevent the horizontal bars of the scaffolding from damaging the building when prestress is applied, a flexible rubber pad is installed at the end of the horizontal bar close to the building to prevent the lateral load of the scaffolding from causing mechanical damage to the building.

[0059] Embodiment 1

[0060] The present invention will be further described below in conjunction with the accompanying drawings:

[0061] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6As shown, a construction method for reinforcing scaffolding with unbonded prestressed material is composed of a building (structure), a scaffolding, an unbonded prestressed system, and auxiliary components. The auxiliary components include a liner ring, a hook, a tensioning platform, a steel back rib, and the like. The specific implementation method is as follows:

[0062] Before the scaffolding is erected, the number, location, and tension of the unbonded prestressed tendons should be calculated in advance according to the existing conditions such as the height, structural form, and layout of the door and window openings of the on-site buildings or structures, and the locations of the prestressed tensioning end and anchorage end should be preselected. The tensioning end and anchorage end can be set at appropriate locations indoors facing the door and window openings of the building, or they can be set on other existing buildings and structures outdoors; the tensioning end and anchorage end can be set separately or centrally; the method of anchoring at one end and tensioning at the other end can also be selected according to the circumference of the scaffolding, or the method of tensioning at both ends can be selected to apply prestress.

[0063] When erecting the scaffold, install rubber pads on the steel pipes inside the horizontal bars to prevent the scaffold from damaging the building's exterior walls; set pad rings on the outermost poles and corners of the scaffold to reduce the loss of prestress during tensioning. The pad rings and the unbonded prestressed tendons are set in the same horizontal plane; to prevent the pad rings from moving downward, fasteners can be installed on the poles below the pad rings, or other measures can be taken to limit the vertical displacement of the pad rings.

[0064] After the scaffolding is erected to the designed height of the unbonded prestressed tendons, the unbonded prestressed tendons can be constructed in the following order:

[0065] 1. Install the prestressing system and set up a tensioning platform at the selected indoor location facing the door and window openings. If the indoor structure is convenient for prestressing construction, the tensioning platform can be cancelled. Install the steel back ribs on the tensioning platform, or set the steel back ribs on other building structures that have little impact, or set them outside the building at other locations suitable for anchoring and applying prestress.

[0066] 2. Installation of unbonded prestressed tendons: Install a hook on the longitudinal horizontal rod just above the prestressed tendon laying path along the previously designed prestressed position, and lay the unbonded prestressed tendons on the hook. The length of the hook must ensure that the prestressed tendons and the liner ring are on the same horizontal plane. Lay the unbonded prestressed tendons along the hook and the liner ring, and the prestressed tendons must completely cover the scaffolding to be reinforced.

[0067] 3. Install the tensioning end and anchoring end, such as Figure 3As shown, anchors are divided into tool anchors and working anchors according to their uses. Gaskets, tool anchors and clamps are installed at the anchoring end and temporarily fixed on the back rib of the steel section; gaskets, working anchors, clamps, jacks, tool anchors and clamps are installed in sequence at the tensioning end. All tensioning end and anchoring end components must be perpendicular to the unbonded prestressed tendons (31).

[0068] 4. Apply prestress, check the scaffolding, prestressing system, lining ring, rubber pad, and operate the jack according to the unbonded prestressing construction process to apply prestress and finally anchor. Then remove the jack, tensioning end tool anchor and its clamp.

[0069] 5. Continue to erect the scaffolding to the position of the unbonded prestressed tendons on the previous layer and apply prestress according to the above process.

[0070] 6. When dismantling the scaffolding, dismantle it from top to bottom; when dismantling the prestressed system, first remove a vertical pole at an appropriate position to loosen the unbonded prestressed tendons, and then dismantle the entire prestressed system. All components of the prestressed system can be recycled. This completes the construction of the scaffolding and its unbonded prestressed tendons.

Claims

1. A scaffold used for renovation and restoration of the facade of an old cultural relic building, comprising a scaffold body, which is circumferentially erected on the outside of the old building and / or cultural relic building that needs to be renovated and / or restored, and is characterized by: The scaffolding also includes a flexible non-bonded prestressed stabilization system, which includes at least a protective component and a binding and tensioning stabilization mechanism. The scaffolding body erected on the outside of the old building and / or the cultural relic building is reinforced and kept stable by the binding and tensioning stabilization mechanism with the cooperation of the corresponding external foundation, and the sides where the scaffolding body is top-connected or attached to the old building and / or the cultural relic building are padded with the protective component.

2. The scaffolding for renovation and restoration of the facade of an old cultural relic building according to claim 1 is characterized in that: The corresponding external foundation is other buildings or structures that are suitable for the location of the old building and / or the cultural relic building, or the inner wall of the old building and / or the cultural relic building where a window or door opening is opened; the protective component at least includes a rubber pad (1), and the contact points between the scaffolding body and the outer wall of the old building and / or the cultural relic building are respectively padded with rubber pads (1).

3. The scaffolding for renovation and restoration of the facade of an old cultural relic building according to claim 1 or 2 is characterized in that: The binding tensioning and stabilizing mechanism comprises at least a tensioning driving assembly and unbonded prestressed stirrups (2). At least two groups of unbonded prestressed stirrups (2) are arranged vertically on the scaffold body at intervals from each other. Each group of unbonded prestressed stirrups (2) is tensioned by a set of tensioning driving assemblies and is detachably fixedly connected to a corresponding external foundation.

4. The scaffolding for renovation and restoration of the facade of an old cultural relic building according to claim 3 is characterized by: Each group of unbonded prestressed stirrups (2) is composed of a flexible steel wire rope, and each set of tensioning drive components includes at least one tensioner (3) and two groups of fixed support structures. The anchoring end of the flexible steel wire rope is detachably arranged on a corresponding external foundation through one group of fixed support structures, and the tensioning end of the flexible steel wire rope can be arranged on a corresponding external foundation in a manner that it can be tightened or loosened through the tensioner (3) in cooperation with another group of fixed support structures.

5. The scaffolding for renovation and restoration of the facade of an old cultural relic building according to claim 4 is characterized in that: Each set of tensioning drive components also includes a back rib support steel (4), each set of fixed structures includes an anchor (5), a gasket (6) and a pair of clamps (7), the tensioner (3) is composed of a set of hydraulic jacks, two mounting holes are arranged on the back rib support steel (4), the anchor end of the flexible steel wire rope is detachably fixed in one mounting hole of the back rib support steel (4) through the anchor (5), the gasket (6) and the clamp (7), the tensioning end of the flexible steel wire rope is tightened or loosened and fixed in another mounting hole of the back rib support steel (4) through the hydraulic jack in cooperation with the anchor (5), the gasket (6) and the clamp (7), and the back rib support steel (4) is back-connected to a corresponding external foundation.

6. The scaffolding for renovation and restoration of the facade of an old cultural relic building according to claim 5 is characterized by: The flexible non-bonded prestressed stabilization system also includes a limit hook (8), and the binding tensioning stabilization mechanism also includes a support pad ring (15). Each flexible steel wire rope is located at each corner of the scaffold body and is supported and bound to the scaffold body through a set of support pad rings (15); the flexible steel wire rope between two adjacent support pad rings (15) is respectively connected to the scaffold body through at least one limit hook (8) with an upper end hung on the scaffold body to maintain the straightness of the section of the flexible steel wire rope.

7. The scaffolding for renovation and restoration of the facade of an old cultural relic building according to claim 6 is characterized by: Each set of supporting pad rings (15) includes a pulley (9) and a set of rolling bearings (10), and each pulley (9) is provided with a wire groove (16). Each pulley (9) is movably arranged on the scaffold body at a corresponding position through a corresponding rolling bearing (10), and the flexible steel wire rope at the corner is bridged in the corresponding wire groove (16). The binding tensioning and stabilizing mechanism also includes a tensioning platform (11), and at least the hydraulic drive component of the hydraulic jack is arranged on the tensioning platform (11).

8. A construction method for erecting a scaffold for renovation and restoration of the facade of an old cultural relic building as described in claim 7, characterized in that: The construction method includes determining the number of sets of unbonded prestressed stirrups to be set according to calculation, determining the arrangement position of the tensioning drive assembly according to the situation of the building to be renovated or repaired, erecting the scaffolding body in sections and layers, and arranging the flexible unbonded prestressed stabilization system in sections and layers and tensioning and fixing the scaffolding body until the erection of the entire scaffolding body is completed.

9. The construction method according to claim 8, characterized in that: While determining the number of unbonded prestressed stirrups required to be installed based on calculations, the installation position and tensioning force of each flexible steel wire rope are determined; When determining the arrangement position of the tension drive assembly according to the situation of the building to be renovated or repaired, it is also determined whether the tension end and the anchor end of each flexible steel wire rope are arranged separately or centrally; When erecting the scaffold body, a rubber pad (1) is installed at the end of the transverse horizontal rod (12) inside the scaffold body; and supporting pad rings are arranged on the outermost vertical rod (13) of the scaffold body and the vertical rod (13) at the corner.

10. The construction method according to claim 9, characterized in that: The flexible unbonded prestressed stabilization system is set up layer by layer and tensioned and fixed according to the following steps: 1) Support component installation: a tensioning platform is set on the selected corresponding foundation, and back rib support steel (4) is installed on the tensioning platform; 2) Installation of unbonded prestressed stirrups: along the previously designed prestressed position, a limit hook (8) is provided on the longitudinal horizontal rod (14) just above the unbonded prestressed stirrup laying path, and the unbonded prestressed stirrups are laid on the limit hook (8). The hanging position of the limit hook (8) must ensure that the unbonded prestressed stirrups and the supporting pad ring are on the same horizontal plane. The unbonded prestressed stirrups are laid along the limit hook (8) and the supporting pad ring, and the unbonded prestressed stirrups must completely cover the scaffolding body to be reinforced; 3) Install the tensioning end and anchoring end of the flexible steel wire rope. The anchors include tool anchors and working anchors according to their uses. Install a gasket (6), a tool anchor and a clamp (7) on the anchoring end in sequence and temporarily fix it on the back rib support steel (4). Install a gasket (6), a working anchor, a clamp (7), a hydraulic jack and a tool anchor on the tensioning end in sequence. All components on the tensioning end and the anchoring end must be perpendicular to the unbonded prestressed tendons. 4) Apply prestressing force. After checking the scaffold body, unbonded prestressing stirrups, support pad rings, and rubber pads (1), according to the unbonded prestressing construction process, operate the hydraulic jack to apply prestressing force and finally anchor it, and then remove the hydraulic jack, the tensioning end tool anchor and its clamp (7); 5) Continue to erect the scaffolding body to the position of the unbonded prestressed stirrups of the previous layer, and apply prestress according to the above process; 6) When dismantling the scaffold, it is dismantled in order from top to bottom; when dismantling the unbonded prestressed stirrups, first remove a vertical pole (13) at a specified position to loosen the unbonded prestressed tendons, then remove the other components of the binding tensioning and stabilizing mechanism, and recycle the various components of the binding tensioning and stabilizing mechanism, thus completing the construction work of the scaffold body and its unbonded prestressed tendons.

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