Cantilever scaffold structure for reinforcing building and construction method thereof

Abstract

The invention provides an overhanging scaffold structure for reinforcing a building and a construction method of the overhanging scaffold structure. The overhanging scaffold structure comprises an overhanging scaffold system and a back-supporting and back-jacking system. The overhanging scaffold system comprises a rear anchoring point ground beam, a front anchoring point ground beam, overhanging I-shaped steel and an outer scaffold system; the overhanging I-shaped steel is fixed on a ground cushion layer or a paving ground of the original old building through the front anchoring point ground beam and the rear anchoring point ground beam, and is horizontally overhung to the outside of the original old building; the external scaffold system is mounted on a plurality of pieces of cantilever I-shaped steel outside the original old building and is fixedly connected with the original old building; the lower end of the back-supporting jacking system is fixedly installed on a plurality of pieces of cantilever I-shaped steel inside the original old building, and the upper end of the back-supporting jacking system is supported on the bottom face of an upper floor of the original old building. The invention relates to the technical field of building construction, and can solve the problems that in the prior art, during old building transformation, an overhanging scaffold is difficult to anchor, and safety is insufficient.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a cantilever scaffolding structure for reinforcing a building and a construction method thereof. Background Art

[0002] With the saturation of the construction industry, new construction projects are gradually decreasing, while old renovation projects are increasing. When reinforcing and renovating old buildings near rivers and lakes, it is necessary to set up external cantilever scaffolding to assist in construction.

[0003] When erecting cantilever scaffolding, two front and rear cantilever anchor points must be established on the base plate or ground to securely connect the cantilever scaffolding to the building structure. However, older buildings often lack a foundation base plate structure, have sparse ground structures, and only have a single foundation beam around the perimeter. This makes it difficult to secure these front and rear anchor points or their load-bearing capacity insufficient, making the cantilever scaffolding system unsafe. Furthermore, if an additional anchor beam is added, its own weight alone would be insufficient to meet the calculated load requirements, rendering it unsafe.

[0004] Chinese utility model patent CN201921601567.9 discloses a cantilever scaffolding top-up support system for top-up cantilever scaffolding. However, this is a simple force-balancing structure that cannot be directly applied to the actual construction conditions of old buildings near rivers and banks. The cantilever scaffolding is not safe enough to use. Therefore, it is necessary to provide a cantilever scaffolding structure and construction method for reinforcing buildings, which can solve the problems of difficult anchoring and insufficient safety of cantilever scaffolding in the renovation of old buildings in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a cantilever scaffolding structure for reinforcing buildings and a construction method thereof, which can solve the problems of difficult anchoring and insufficient safety of cantilever scaffolding during renovation of old buildings in the prior art.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A cantilever scaffolding structure for reinforcing a building comprises: a cantilever scaffolding system and a back-supporting system; the cantilever scaffolding system comprises a rear anchoring point ground beam, a front anchoring point ground beam, a cantilever I-beam and an external scaffolding system; the rear anchoring point ground beam and the front anchoring point ground beam are both constructed on the ground cushion or paved ground of the original old building, and the front anchoring point ground beam and the rear anchoring point ground beam are installed at intervals along the length direction of the cantilever I-beam, so that the cantilever I-beam is fixed to the ground by the front anchoring point ground beam and the rear anchoring point ground beam. The cantilevered I-beams are arranged on the ground cushion or paved ground of the original old building, and the cantilevered I-beams are horizontally cantilevered to the outside of the original old building; a number of cantilevered I-beams are arranged at intervals along the length direction of the external scaffolding system, so that the external scaffolding system is installed on the several cantilevered I-beams on the outside of the original old building and is connected and fixed to the original old building; the lower end of the anti-supporting and back-to-top system is fixedly installed on the several cantilevered I-beams inside the original old building, and the upper end of the anti-supporting and back-to-top system is supported on the bottom surface of the upper floor of the original old building.

[0008] The top elevations of the rear anchor point ground beam and the front anchor point ground beam are consistent with the top elevations of the ground cushion or paved ground of the original old building;

[0009] The rear anchor point ground beam is located at the structural ground ring beam of the original old building, and the rear anchor point ground beam is fixedly connected to the structural ground ring beam of the original old building through embedded reinforcement to form a whole.

[0010] The front anchor point ground beam is set close to the outer wall of the original old building, and the front anchor point ground beam and the reinforced foundation of the outer wall are constructed simultaneously into a whole;

[0011] A pre-buried hole wooden box is pre-buried in the exterior wall, so that the cantilevered I-beam passes through the pre-buried hole wooden box and penetrates the exterior wall.

[0012] The rear anchor point ground beam and the front anchor point ground beam are both reinforced concrete structures, and a number of tensile strength horizontal bars are arranged at intervals in the rear anchor point ground beam and the front anchor point ground beam; the rear anchor point embedded compression ring steel bars are embedded on the rear anchor point ground beam, and the stirrups in the rear anchor point ground beam at the rear anchor point embedded compression ring steel bars are densely arranged, and the cantilevered I-beam is connected and fixed to the rear anchor point ground beam through the rear anchor point embedded compression ring steel bars; the front anchor point embedded compression ring steel bars are embedded on the front anchor point ground beam, and the stirrups in the front anchor point ground beam at the front anchor point embedded compression ring steel bars are densely arranged, and the cantilevered I-beam is connected and fixed to the front anchor point ground beam through the front anchor point embedded compression ring steel bars.

[0013] The external scaffolding system is connected and fixed to the outer side of the balcony beam of the original old building through the wall connecting piece.

[0014] A wire rope eye is implanted and installed on the internal beam of the original old building. One end of the wire rope is connected to the internal beam of the original old building through the wire rope eye, and the other end of the wire rope is connected to the cantilever I-beam located outside the original old building.

[0015] The several cantilevered I-beams are located at one end of the original old building and are spaced apart by several I-beam connecting beams, so that the several cantilevered I-beams are connected into a whole through the I-beam connecting beams, which serve as the anti-support and return top base of the anti-support and return top system, and the anti-support and return top system is installed on the several I-beam connecting beams.

[0016] The described back-support and top-returning system includes top-returning scaffolding uprights, longitudinal and transverse horizontal bars, foot sleeves and adjustable top supports; the foot sleeves are fixedly arranged on the I-steel connecting beam, the lower ends of the top-returning scaffolding uprights are inserted into the foot sleeves, and the adjustable top supports are installed on the upper ends of the top-returning scaffolding uprights, and the adjustable top supports are supported on the bottom surface of the upper floor of the original old building through the top supporting members; a number of top-returning scaffolding uprights are vertically arranged between the I-steel connecting beam and the upper floor of the original old building, and multiple top-returning scaffolding uprights arranged horizontally and longitudinally are connected into a whole through longitudinal and transverse horizontal bars.

[0017] A construction method for a cantilever scaffolding structure for reinforcing a building comprises the following steps:

[0018] Step 1: Based on the building parameters, use engineering software to calculate and select the specifications of the cantilever I-beam, the pre-embedded compression ring reinforcement at the rear anchor point, and the pre-embedded compression ring reinforcement at the front anchor point;

[0019] Step 2: According to the reinforcement construction plan for the original old building, position and lay out the cantilever scaffolding system, and mark the positions of the rear anchor points and the front anchor points;

[0020] Step 3: Drill holes on the exterior wall according to the positioning line and install the pre-buried hole wooden box;

[0021] Step 4: Add a rear anchorage point ground beam at the rear anchorage point, and add a front anchorage point ground beam at the front anchorage point. The reinforced foundation of the exterior wall and the front anchorage point ground beam are constructed simultaneously.

[0022] Step 5: Tie the ground beam reinforcement of the rear anchorage point ground beam and the front anchorage point ground beam, and install the rear anchorage point embedded compression ring reinforcement of the rear anchorage point ground beam and the front anchorage point embedded compression ring reinforcement of the front anchorage point ground beam;

[0023] Step 6: Pour the concrete of the rear anchor point beam and the front anchor point beam and cure for at least 7 days;

[0024] Step 7: Install the cantilever I-beam. Connect and fix the cantilever I-beam to the ground beam at the rear anchor point through the pre-embedded compression ring reinforcement at the rear anchor point. Connect and fix the cantilever I-beam to the ground beam at the front anchor point through the pre-embedded compression ring reinforcement at the front anchor point. Use wooden blocks to plug the gaps between the pre-embedded compression ring reinforcement at the rear anchor point, the pre-embedded compression ring reinforcement at the front anchor point, and the cantilever I-beam.

[0025] Step 8: Install an I-beam coupling beam at the tail end of the cantilevered I-beam located inside the original old building. Weld the I-beam coupling beam to the cantilevered I-beam to form a whole, which serves as the back-support base of the back-support system.

[0026] Step 9: Install foot sleeves on the I-beam coupling beams to connect the lower ends of the return scaffolding uprights; install adjustable top supports on the upper ends of the return scaffolding uprights, fill the adjustable top supports with top support members and press them tightly against the bottom surface of the upper floor of the original old building;

[0027] Step 10: Erect an external scaffolding system on the cantilevered I-beams on the exterior of the original old building;

[0028] Step 11: The external scaffolding system is connected and fixed to the outer side of the balcony beam of the original old building through wall connectors;

[0029] Step 12: Install the wire rope through the wire rope eye embedded in the internal beam of the original old building, and connect the lower end of the wire rope to the end of the cantilevered I-beam outside the original old building.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention is provided with a cantilever scaffolding system and a reverse support and top-up system. By adding a rear anchor point ground beam and a front anchor point ground beam and connecting them with the structural ground ring beam of the original old building to form an integral whole, the structure is stable and reliable. The cantilever I-beam located at one end inside the original old building is fixed by the pre-embedded compression ring steel bars at the rear anchor point and the pre-embedded compression ring steel bars at the front anchor point, thereby improving the structural safety of the external scaffolding system on the cantilever I-beam located outside the original old building, solving the problems of difficult anchoring and installation of cantilever I-beams and insufficient safety of cantilever scaffolding in the prior art. At the same time, the reverse support and top-up system is used to top up the end of the cantilever I-beam located inside the original old building, further improving the overall safety of the external scaffolding system, achieving a double insurance effect, and solving the problem of insufficient safety of cantilever scaffolding in the prior art.

[0032] 2. The present invention carries out the reinforcement construction of the ground beam at the front anchor point and the original foundation of the outer wall simultaneously, which advances the process and avoids secondary construction disturbance. The present invention connects the I-beam connecting beam to the cantilevered I-beam at the ground beam at the rear anchor point to form a well-integrated anti-support and top-return base to ensure the anti-support and top-return effect.

[0033] 3. The cantilever scaffolding system and the reverse support and top-returning system of the present invention have simple structure, are easy to construct, convenient to operate, and have strong feasibility. They can be widely used in the processing and construction of old buildings and have good promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0035] Figure 1 is a cross-sectional view of a cantilever scaffolding structure for reinforcing a building according to the present invention;

[0036] Figure 2 It is a schematic diagram of the internal top-return elevation of the cantilever scaffolding structure for reinforcing a building according to the present invention;

[0037] Figure 3 This is a large-scale drawing of the ground beam at the rear anchor point in the cantilever scaffolding structure used to reinforce a building according to the present invention;

[0038] Figure 4 This is a large-scale drawing of the front anchorage point ground beam in the cantilever scaffolding structure used to reinforce buildings according to the present invention;

[0039] Figure 5 This is a large-scale drawing of a reinforced foundation in a cantilever scaffolding structure used to reinforce a building according to the present invention;

[0040] Figure 6 This is a large-scale drawing of the connection between the rear anchorage point ground beam in the cantilever scaffolding structure used to reinforce the building by the present invention and the structural ring beam of the original old building.

[0041] In the figure, 101 is the upper floor of the original old building; 102 is the ground cushion or paved ground of the original old building; 103 is the top supporting member; 104 is the upright pole of the return scaffolding; 105 is the vertical and horizontal rod; 106 is the foot sleeve; 107 is the I-beam; 108 is the embedded compression ring steel bar at the rear anchorage point; 109 is the ground beam at the rear anchorage point; 1091 is the anchor bar; 1092 is the Class A structural adhesive; 110 is the exterior wall; 111 is the embedded wooden box for the opening; 112 is the embedded compression ring steel bar at the front anchorage point; 113 is the ground beam at the front anchorage point; 114 is the reinforced foundation; 115 is the cantilever I-beam; 116 is the wire rope eye; 117 is the wall connection member; 118 is the wire rope; 119 is the external scaffolding system; 120 is the adjustable top support; 121 is the structural ground ring beam of the original old building. DETAILED DESCRIPTION

[0042] The following, in conjunction with the accompanying drawings and specific embodiments, further details the cantilever scaffolding structure for reinforcing buildings and its construction method, as proposed by the present invention. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are highly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0043] Please see the attached Figure 1A cantilever scaffolding structure for reinforcing a building comprises a cantilever scaffolding system and a back-supporting system; the cantilever scaffolding system comprises a rear anchoring point ground beam 109, a front anchoring point ground beam 113, a cantilever I-beam 115 and an external scaffolding system 119; the rear anchoring point ground beam 109 and the front anchoring point ground beam 113 are both constructed on the ground cushion or paved ground 102 of the original old building, and the front anchoring point ground beam 113 and the rear anchoring point ground beam 109 are installed at intervals along the length direction of the cantilever I-beam 115, so that the cantilever I-beam 115 passes through the front anchoring point ground beam 113 and the rear anchoring point ground beam The ground beam 109 is fixed on the ground cushion or paved ground 102 of the original old building, and the cantilevered I-beam 115 is horizontally cantilevered to the outside of the original old building; a plurality of cantilevered I-beams 115 are arranged at intervals along the length direction of the external scaffolding system 119, so that the external scaffolding system 119 is installed on the plurality of cantilevered I-beams 115 outside the original old building and is connected and fixed to the original old building; the lower end of the anti-supporting and back-to-top system is fixedly installed on the plurality of cantilevered I-beams 115 inside the original old building, and the upper end of the anti-supporting and back-to-top system is supported on the bottom surface of the upper floor 101 of the original old building.

[0044] By adding rear anchoring point ground beams 109 and front anchoring point ground beams 113 to the original old building, which are used to install and anchor cantilever I-beams 115, the cantilever I-beams 115 are horizontally cantilevered to the exterior of the original old building and have a high load-bearing capacity. Thus, an external scaffolding system 119 is erected on the cantilever I-beams 115 on the exterior of the original old building. The external scaffolding system 119 is connected and reinforced to the original old building. At the same time, a back-supporting and top-returning system is installed between the cantilever I-beams 115 inside the original old building and the bottom surface of the upper floor 101 of the original old building, and the top-returning force is used to further improve the load-bearing capacity of the cantilever I-beams 115.

[0045] Old buildings generally only have structural ground ring beams 121 on all four sides, and the ground is sparsely paved. When a cantilever scaffolding system is used for facade construction, by adding a front anchorage ground beam 113 and a rear anchorage ground beam 109 at the front anchorage point, combined with the scaffolding structure of the back-supporting system, the structural strength is high, doubly ensuring the safety of the cantilever scaffolding system.

[0046] The external scaffolding system 119 can adopt a traditional scaffolding structure and be erected using conventional technology, and its specific structure and erection process will not be described in detail here.

[0047] The top surface elevations of the rear anchor point ground beam 109 and the front anchor point ground beam 113 are consistent with the top surface elevations of the ground cushion or paved ground 102 of the original old building, and do not affect the appearance and use of the ground cushion or paved ground 102 of the original old building.

[0048] Preferably, the rear anchor point ground beam 109 and the front anchor point ground beam 113 are both cast with C30 concrete, the specification of the internal longitudinal reinforcement is C18, the specification of the stirrups is C8@200 / 100, the size of the rear anchor point ground beam 109 can be 400×300mm, and the size of the front anchor point ground beam 113 can be 200×300mm.

[0049] Please see the attached Figure 6 The rear anchoring point ground beam 109 is located at the structural ground ring beam 121 of the original old building, and the rear anchoring point ground beam 109 is fixedly connected to the structural ground ring beam 121 of the original old building through the embedded steel bars 1091 to form a whole.

[0050] The embedded reinforcement depth of the rear anchor point ground beam 109 is 12d (i.e. 12 times the diameter of the embedded reinforcement 1091), and the embedded reinforcement part is sealed with Class A structural adhesive 1092 to form a whole, ensuring the connection reliability and integrity of the rear anchor point ground beam 109 and the structural ground ring beam 121 of the original old building, thereby improving the anchoring installation reliability at the rear anchor point of the cantilever I-beam 115.

[0051] Please see the attached Figure 1 and attached Figure 5 The front anchoring point ground beam 113 is set close to the outer wall 110 of the original old building. The front anchoring point ground beam 113 and the reinforced foundation 114 of the outer wall 110 are constructed synchronously into a whole to avoid later excavation.

[0052] When reinforcing the old building, the outer wall 110 is reinforced and thickened. Figure 5 As shown in 1101 , the original foundation 1102 of the exterior wall 110 is thickened and reinforced to form a reinforced foundation 114 .

[0053] Please see the attached Figure 1 A pre-buried hole wooden box 111 is pre-buried in the exterior wall 110 , so that the cantilevered I-beam 115 passes through the pre-buried hole wooden box 111 and penetrates the exterior wall 110 .

[0054] Preferably, the size of the pre-buried hole wooden box 111 can be determined according to the cross-sectional size of the cantilevered I-beam 115 to ensure that the cantilevered I-beam 115 can be installed through it, so as to avoid the cantilevered I-beam 115 being difficult to pull out after the reinforcement construction of the exterior wall 110. After the construction is completed, the cantilevered I-beam 115 is pulled out and the pre-buried hole wooden box 111 is filled and sealed.

[0055] Please see the attached Figure 3 and attached Figure 4The rear anchor point ground beam 109 and the front anchor point ground beam 113 are both reinforced concrete structures, and a number of tensile strength horizontal bars (not shown in the figure) are arranged at intervals in the rear anchor point ground beam 109 and the front anchor point ground beam 113; the rear anchor point embedded compression ring steel bar 108 is pre-embedded on the rear anchor point ground beam 109, and the stirrups in the rear anchor point ground beam 109 at the rear anchor point embedded compression ring steel bar 108 are densely arranged, and the cantilevered I-beam 115 is connected and fixed to the rear anchor point ground beam 109 through the rear anchor point embedded compression ring steel bar 108; the front anchor point embedded compression ring steel bar 112 is pre-embedded on the front anchor point ground beam 113, and the stirrups in the front anchor point ground beam 113 at the front anchor point embedded compression ring steel bar 112 are densely arranged, and the cantilevered I-beam 115 is connected and fixed to the front anchor point ground beam 113 through the front anchor point embedded compression ring steel bar 112.

[0056] The reinforced concrete structure of the rear anchorage beam 109 and the front anchorage beam 113 has high structural strength and is connected to the original structural ring beam 121 of the old building to form a high-strength integral structure to ensure the installation reliability of the fixed end of the cantilevered I-beam 115. Preferably, the specification of the tensile strength horizontal reinforcement can be C18.

[0057] The front anchor point embedded compression ring steel bars 112 and the rear anchor point embedded compression ring steel bars 108 are used to fix the cantilever I-beam 115 on the front anchor point ground beam 113 and the rear anchor point ground beam 109. The number of the front anchor point embedded compression ring steel bars 112 and the rear anchor point embedded compression ring steel bars 108 can be adaptively adjusted according to actual fixing requirements, preferably two front anchor point embedded compression ring steel bars 112 and one rear anchor point embedded compression ring steel bar 108.

[0058] Please see the attached Figure 1 The external scaffolding system 119 is connected and fixed to the outer side of the balcony beam of the original old building through the wall connecting piece 117.

[0059] Preferably, the wall ties 117 can be a bolt-type wall tie system according to existing technology and can be arranged according to the calculation requirements. The wall ties 117 connect and fix the external scaffolding system 119 to the balcony beams of the original old building, further improving the structural stability and safety of the external scaffolding system 119.

[0060] Please see the attached Figure 1 A wire rope eye 116 is implanted and installed on the internal beam of the original old building. One end of the wire rope 118 is connected to the internal beam of the original old building through the wire rope eye 116, and the other end of the wire rope 118 is connected to the cantilevered I-beam 115 located outside the original old building.

[0061] Preferably, the wire rope eye 116 can be implanted into the internal beam of the original old building using M20 bolts, and the implantation depth of the wire rope eye 116 is not less than 200 mm to ensure the reliability of the connection between the wire rope 118 and the original old building.

[0062] The other end of the steel wire rope 118 is connected to the cantilevered I-beam 115 outside the original old building, so as to transfer the load of the cantilevered I-beam 115 to the original old building, thereby improving the safety of the external scaffolding system 119.

[0063] Please see the attached Figure 1 The several cantilevered I-beams 115 are located at one end of the original old building and are spaced apart by several I-beam connecting beams 107, so that the several cantilevered I-beams 115 are connected into a whole through the I-beam connecting beams 107, serving as the back-supporting and top-returning base of the back-supporting and top-returning system, and the back-supporting and top-returning system is installed on the several I-beam connecting beams 107.

[0064] Preferably, the I-beam connecting beam 107 and the cantilevered I-beam 115 are connected by welding to form a solid and stable structure as a whole, which serves as a back-supporting and top-returning base to ensure that the back-supporting and top-returning base can meet the installation and top-returning requirements of the back-supporting and top-returning system.

[0065] Please see the attached Figure 1 and attached Figure 2 The described back-supporting and back-to-top system includes a back-to-top scaffolding upright 104, a longitudinal and transverse horizontal rod 105, a foot sleeve 106 and an adjustable top support 120; the foot sleeve 106 is fixedly arranged on the I-steel coupling beam 107, the lower end of the back-to-top scaffolding upright 104 is inserted into the foot sleeve 106, and the adjustable top support 120 is installed at the upper end of the back-to-top scaffolding upright 104, and the adjustable top support 120 is supported on the bottom surface of the upper floor 101 of the original old building through the top supporting member 103; a plurality of back-to-top scaffolding uprights 104 are vertically arranged between the I-steel coupling beam 107 and the upper floor 101 of the original old building, and multiple back-to-top scaffolding uprights 104 arranged horizontally and longitudinally are connected into a whole through the longitudinal and transverse horizontal rods 105.

[0066] The back-supporting and top-returning system is constructed by conventional techniques using the top-returning scaffolding uprights 104 and the longitudinal and transverse horizontal bars 105 to form a traditional scaffolding structure, and its construction process will not be described in detail here.

[0067] The bottom of the return scaffolding upright 104 is supported on the reverse support return base by the foot sleeve 106 fixed to the I-beam 107 by welding, and the top of the return scaffolding upright 104 is supported on the bottom surface of the upper floor 101 of the original old building by the adjustable top support 120 and the top supporting member 103 inside it, ensuring the stability and safety of the installation and use of the cantilevered I-beam 115.

[0068] Preferably, 48×3.6 steel pipes can be used for the top-return scaffolding uprights 104 and the vertical and horizontal bars 105. The top support member 103 can be made of wooden planks or small square steel pipes to increase the contact area while preventing relative sliding. The top-return position should be set as close as possible to the primary and secondary beams of the upper floor 101 of the original old building to ensure that the load-bearing performance of the top-return position meets the design requirements.

[0069] Preferably, the adjustable jacking support 120 can adopt a traditional jacking support structure that adjusts the height by rotating a thread.

[0070] Please see the attached Figure 1 To the attached Figure 6 , a construction method for a cantilever scaffolding structure for reinforcing a building, comprising the following steps:

[0071] Step 1: Based on parameters such as building height, use engineering software to calculate and select the specifications of the cantilever I-beam 115, the pre-embedded compression ring steel bars 108 at the rear anchor point, and the pre-embedded compression ring steel bars 112 at the front anchor point.

[0072] Step 2: According to the reinforcement construction plan for the original old building, the cantilever scaffolding system is positioned and laid out, and the positions of the rear anchor point and the front anchor point are marked, wherein the front anchor point is set close to the inner side of the outer wall 110.

[0073] Step 3: Drill a hole in the exterior wall 110 according to the location of the positioning line, and install a pre-buried hole wooden box 111 to prevent the cantilevered I-beam 115 from being difficult to pull out after the reinforcement construction.

[0074] Step 4: Add a rear anchoring point ground beam 109 at the rear anchoring point, add a front anchoring point ground beam 113 at the front anchoring point, and construct the reinforced foundation 114 of the exterior wall 110 and the front anchoring point ground beam 113 simultaneously.

[0075] Step 5: Tie the ground beam reinforcements of the rear anchorage point ground beam 109 and the front anchorage point ground beam 113 , and install the rear anchorage point embedded compression ring reinforcements 108 of the rear anchorage point ground beam 109 and the front anchorage point embedded compression ring reinforcements 112 of the front anchorage point ground beam 113 .

[0076] Step 6: Pour concrete of the rear anchorage point ground beam 109 and the front anchorage point ground beam 113 and cure for at least 7 days.

[0077] Step 7: Install the cantilever I-beam 115. The cantilever I-beam 115 is connected and fixed to the ground beam 109 at the rear anchor point through the pre-embedded compression ring steel bars 108 at the rear anchor point. The cantilever I-beam 115 is connected and fixed to the ground beam 113 at the front anchor point through the pre-embedded compression ring steel bars 112 at the front anchor point. The gaps between the pre-embedded compression ring steel bars 108 at the rear anchor point and the pre-embedded compression ring steel bars 112 at the front anchor point and the cantilever I-beam 115 are plugged with wooden planks.

[0078] By setting the rear anchor point and the front anchor point, it is convenient to set the rear anchor point ground beam 109 and the front anchor point ground beam 113, thereby facilitating the anchoring of the cantilevered I-beam 115 on the ground cushion layer or paved ground 102 of the original old building, and the cantilevered I-beam 115 is fixed by the pre-embedded compression ring steel bars 108 at the rear anchor point and the pre-embedded compression ring steel bars 112 at the front anchor point, thereby solving the problems of inconvenient anchoring and installation and insufficient safety of the cantilevered I-beam in the prior art.

[0079] Step 8: Install the I-beam coupling beam 107 at the tail of the cantilevered I-beam 115 located in the original old building. The I-beam coupling beam 107 is welded to the cantilevered I-beam 115 to form a whole, which serves as the back-supporting base of the back-supporting system.

[0080] Step 9: Install foot sleeves 106 on the I-beam 107 to receive the lower ends of the return scaffolding uprights 104. Install adjustable supports 120 on the upper ends of the return scaffolding uprights 104. Fill the adjustable supports 120 with top support members 103, such as wooden planks or small square steel pipes, and press them firmly against the bottom surface of the original upper floor 101 of the old building. Note that the return position of the adjustable supports 120 should be located as close as possible to the primary and secondary beams of the original upper floor 101 of the old building.

[0081] Step 10: Erect an external scaffolding system 119 on the cantilevered I-beam 115 on the exterior of the original old building.

[0082] Step 11: The external scaffolding system 119 is connected and fixed to the outside of the balcony beams of the original old building through wall ties 117. Wall ties 117 must not be installed on the masonry structure to avoid damaging the masonry structure.

[0083] Step 12: Install the steel wire rope 118 through the steel wire rope eye 116 embedded in the internal beam of the original old building. The lower end of the steel wire rope 118 is connected to the end of the cantilevered I-beam 115 outside the original old building.

[0084] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A cantilever scaffolding structure for reinforcing a building, characterized in that: include: Cantilever scaffolding system and counter-supporting system; The cantilever scaffolding system includes a rear anchoring point ground beam (109), a front anchoring point ground beam (113), a cantilever I-beam (115) and an external scaffolding system (119); the rear anchoring point ground beam (109) and the front anchoring point ground beam (113) are both constructed on the ground cushion or paved ground (102) of the original old building, and the front anchoring point ground beam (113) and the rear anchoring point ground beam (109) are installed at intervals along the length direction of the cantilever I-beam (115), so that the cantilever I-beam (115) is fixed to the original old building through the front anchoring point ground beam (113) and the rear anchoring point ground beam (109). The invention relates to a method for providing a scaffolding system for the construction of a building. The scaffolding system comprises a plurality of cantilevered I-beams (115) arranged at intervals along the length direction of the external scaffolding system (119), so that the external scaffolding system (119) is installed on the plurality of cantilevered I-beams (115) outside the original old building and is connected and fixed to the original old building. The lower end of the anti-supporting and top-returning system is fixedly installed on the plurality of cantilevered I-beams (115) inside the original old building, and the upper end of the anti-supporting and top-returning system is supported on the bottom surface of the upper floor (101) of the original old building.

2. The cantilever scaffolding structure for reinforcing a building according to claim 1, characterized in that: The top elevations of the rear anchoring point ground beam (109) and the front anchoring point ground beam (113) are consistent with the top elevations of the ground cushion or paved ground (102) of the original old building; The rear anchoring point ground beam (109) is located at the structural ground ring beam (121) of the original old building, and the rear anchoring point ground beam (109) is fixedly connected to the structural ground ring beam (121) of the original old building through planting bars (1091) to form a whole.

3. The cantilever scaffolding structure for reinforcing a building according to claim 1 or 2, characterized in that: The front anchoring point ground beam (113) is arranged close to the outer wall (110) of the original old building, and the front anchoring point ground beam (113) and the reinforced foundation (114) of the outer wall (110) are constructed synchronously to form a whole.

4. The cantilever scaffolding structure for reinforcing a building according to claim 3, wherein: A pre-buried hole wooden box (111) is pre-buried in the outer wall (110), so that the cantilevered I-beam (115) passes through the pre-buried hole wooden box (111) and penetrates the outer wall (110).

5. The cantilever scaffolding structure for reinforcing a building according to claim 1 or 2, characterized in that: The rear anchoring point ground beam (109) and the front anchoring point ground beam (113) are both reinforced concrete structures. A plurality of anti-pulling horizontal reinforcements are arranged at intervals in the rear anchoring point ground beam (109) and the front anchoring point ground beam (113); the rear anchoring point pre-embedded compression ring reinforcement (108) is pre-embedded on the rear anchoring point ground beam (109); the stirrups in the rear anchoring point ground beam (109) at the rear anchoring point pre-embedded compression ring reinforcement (108) are densely arranged; the cantilevered I-beam (1 15) is connected and fixed to the rear anchor point ground beam (109) through the rear anchor point pre-embedded compression ring steel bar (108); the front anchor point pre-embedded compression ring steel bar (112) is pre-embedded on the front anchor point ground beam (113), the stirrups in the front anchor point ground beam (113) are densely arranged at the front anchor point pre-embedded compression ring steel bar (112), and the cantilevered I-beam (115) is connected and fixed to the front anchor point ground beam (113) through the front anchor point pre-embedded compression ring steel bar (112).

6. The cantilever scaffolding structure for reinforcing a building according to claim 1, wherein: The external scaffolding system (119) is connected and fixed to the outer side of the balcony beam of the original old building through the wall connecting piece (117).

7. The cantilever scaffolding structure for reinforcing a building according to claim 1, wherein: A wire rope eye (116) is implanted and installed on the internal beam of the original old building, one end of the wire rope (118) is connected to the internal beam of the original old building through the wire rope eye (116), and the other end of the wire rope (118) is connected to the cantilevered I-beam (115) located outside the original old building.

8. The cantilever scaffolding structure for reinforcing a building according to claim 1, wherein: The plurality of cantilevered I-beams (115) are located at one end of the original old building and are spaced apart by a plurality of I-beam coupling beams (107), so that the plurality of cantilevered I-beams (115) are connected into a whole through the I-beam coupling beams (107), serving as a back-supporting and top-returning base of the back-supporting and top-returning system, and the back-supporting and top-returning system is installed on the plurality of I-beam coupling beams (107).

9. The cantilever scaffolding structure for reinforcing a building according to claim 8, wherein: The back-supporting and top-returning system comprises a top-returning scaffolding upright pole (104), a longitudinal and transverse horizontal pole (105), a foot sleeve (106) and an adjustable top support (120); the foot sleeve (106) is fixedly arranged on an I-steel coupling beam (107), the lower end of the top-returning scaffolding upright pole (104) is inserted into the foot sleeve (106), the adjustable top support (120) is installed on the upper end of the top-returning scaffolding upright pole (104), and the adjustable top support (120) is supported on the bottom surface of the upper floor (101) of the original old building through a top supporting member (103); a plurality of top-returning scaffolding upright poles (104) are vertically arranged between the I-steel coupling beam (107) and the upper floor (101) of the original old building, and a plurality of top-returning scaffolding upright poles (104) arranged transversely and longitudinally are connected into a whole through the longitudinal and transverse horizontal poles (105).

10. A construction method for a cantilever scaffolding structure for reinforcing a building, characterized in that: The following steps are involved: Step 1: According to the building parameters, the specifications of the cantilever I-beam (115), the specifications of the pre-embedded compression ring steel bars (108) at the rear anchorage point, and the specifications of the pre-embedded compression ring steel bars (112) at the front anchorage point are calculated and selected using engineering software; Step 2: According to the reinforcement construction plan for the original old building, position and lay out the cantilever scaffolding system, and mark the positions of the rear anchor points and the front anchor points; Step 3: Drill a hole on the outer wall (110) according to the position of the positioning line, and install the pre-buried hole wooden box (111); Step 4: Add a rear anchoring point ground beam (109) at the rear anchoring point, add a front anchoring point ground beam (113) at the front anchoring point, and construct the reinforced foundation (114) of the exterior wall (110) and the front anchoring point ground beam (113) simultaneously; Step 5: Tie the ground beam reinforcements of the rear anchoring point ground beam (109) and the front anchoring point ground beam (113), and install the rear anchoring point pre-buried compression ring reinforcements (108) of the rear anchoring point ground beam (109) and the front anchoring point pre-buried compression ring reinforcements (112) of the front anchoring point ground beam (113); Step 6: pouring concrete of the rear anchorage point ground beam (109) and the front anchorage point ground beam (113), and curing for at least 7 days; Step 7: Install the cantilever I-beam (115), the cantilever I-beam (115) is connected and fixed to the rear anchor point ground beam (109) through the rear anchor point pre-embedded compression ring steel bar (108), the cantilever I-beam (115) is connected and fixed to the front anchor point ground beam (113) through the front anchor point pre-embedded compression ring steel bar (112), and the gap between the rear anchor point pre-embedded compression ring steel bar (108) and the front anchor point pre-embedded compression ring steel bar (112) and the cantilever I-beam (115) is plugged with wood; Step 8: Install an I-beam coupling beam (107) at the tail of the cantilevered I-beam (115) located in the original old building, and weld the I-beam coupling beam (107) and the cantilevered I-beam (115) together to form a whole, which serves as the back-supporting base of the back-supporting system; Step 9: Install a foot cover (106) on the I-beam coupling beam (107) for plugging the lower end of the return scaffolding upright (104); install an adjustable top support (120) on the upper end of the return scaffolding upright (104), and fill the adjustable top support (120) with the top supporting member (103) and press it tightly against the bottom surface of the upper floor (101) of the original old building; Step 10: Erect an external scaffolding system (119) on the cantilevered I-beam (115) outside the original old building; Step 11: The external scaffolding system (119) is connected and fixed to the outer side of the balcony beam of the original old building through the wall connecting piece (117); Step 12: Install the steel wire rope (118) through the steel wire rope eye (116) implanted on the internal beam of the original old building, and connect the lower end of the steel wire rope (118) to the end of the cantilevered I-beam (115) outside the original old building.

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