Construction method for removing gate tower beam slab and gate tower stairway

Abstract

The invention discloses a construction method for dismantling a door building beam plate and a door building stair. The construction method comprises the steps that firstly, construction preparation is conducted; secondly, a back-to-top full space supporting frame is erected; step 3, removing greening and soil; fourthly, the stone decoration layer and the leveling layer are removed; fifthly, the cantilever plate is dismantled; sixthly, the inclined plate and the platform plate are dismantled; seventhly, the secondary beams of the gate building are dismantled; eighthly, the main beam is dismantled; ninthly, the back-to-top full space supporting frame is dismantled; tenthly, stairs at the lower end of the door building are dismantled; eleventhly, construction waste is cleared and transported; aiming at the problems that a dismantling site is narrow, surrounding buildings are dense, large dismantling mechanical equipment cannot pass through and the mobility is poor, a machine without amplitude or with low amplitude is provided for dismantling operation, so that disturbance and damage to structures such as reserved beams, plates and columns in the dismantling process can be effectively avoided; and the safety and accuracy of construction are guaranteed, and before dismantling, a back-to-top full space supporting frame is erected firstly.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and specifically to a construction method for demolishing the beam-slab of a gateway building and the staircase of the gateway building. Background Technique

[0002] As an important part of a building, the beam-slab, staircase and other structures of a gateway building may need to be demolished due to being old, having unreasonable design or functional changes. For example, during the protective restoration of some historical buildings, in order to restore their original appearance or adjust the internal space, it is necessary to demolish or transform structures such as gateway buildings. In addition, commercial buildings, office buildings, etc. may also need to demolish or reconstruct the gateway building in order to improve the usage efficiency or aesthetics.

[0003] The existing construction methods for demolishing the beam-slab of a gateway building and the staircase of the gateway building have the following defects: First, the limitation of the access road has become a major bottleneck restricting construction. Due to the narrow road and the need to pass under an existing municipal bridge, large demolition machinery and equipment simply cannot pass. This limitation not only increases the construction difficulty, but also severely restricts the progress and efficiency of the demolition work, forcing the construction team to look for alternative solutions, which may increase the construction cost and time. Second, the environmental complexity around the demolition site also poses quite a challenge. The surrounding buildings are dense and often closely connected to the beam-slab and staircase of the gateway building to be demolished. Traditional demolition methods, such as using large machinery for overall demolition, are very likely to cause irreversible damage to the surrounding buildings and may even lead to safety accidents. Third, the traditional demolition methods themselves also have many potential safety hazards and efficiency problems. Due to the lack of effective mechanized means, the demolition process is often time-consuming and laborious, with low efficiency. This not only prolongs the construction period, but also may increase the uncertainty and risk during the construction process. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction method for demolishing the beam-slab of a gateway building and the staircase of the gateway building to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A construction method for demolishing the beam-slab of a gateway building and the staircase of the gateway building, including Step 1, construction preparation; Step 2, erecting a full hall formwork support for back propping; Step 3, clearing the greenery and soil; Step 4, removing the stone decoration layer and the leveling layer; Step 5, demolishing the cantilever slab; Step 6, demolishing the inclined slab and the platform slab; Step 7, demolishing the secondary beam of the gateway building; Step 8, demolishing the main beam; Step 9, demolishing the full hall formwork support for back propping; Step 10, demolishing the lower-end staircase of the gateway building; Step 11, transporting away the construction waste. Among them, in the above Step 1, the workers take their positions, prepare the scaffolding materials and auxiliary materials, and the truck crane, wall cutting machine, electric drill, oxygen cutting torch, electric hammer, small-piece transport vehicle equipment arrive at the site, and the on-site standardized guardrail enclosure is completed. In the above step two, compact the soil layer in the formwork cushion area, detect the compaction degree, and set up the support frame. For the beam area, set up the vertical poles according to the requirements in the calculation book. For the slab area, set up to a certain height below the slab top elevation to form an operation platform. In the above step three, use a logging saw to cut the green plants, then manually dig out the roots, remove the planting soil of the green plants, and use a crane to hoist them to the ground for stacking. In the above step four, remove the stone decorative surface layer and use a crane to hoist it to the ground for stacking. Remove the leveling layer and hoist it by crane. In the above step five, use a concrete wall cutting machine to cut the cantilever slab and divide it into blocks according to certain dimensions. The operators tighten the lifting ring bolts, connect them with lifting U-shaped fasteners, and then use a crane to transfer them to the ground. In the above step six, use a concrete wall cutting machine to cut the floor slab of the gatehouse and divide it into blocks according to certain dimensions. Tighten the lifting ring bolts in the same way, connect them with lifting U-shaped fasteners, and transfer them to the ground by crane. In the above step seven, use a concrete wall cutting machine to cut the secondary beams of the gatehouse, layer by layer and section by section. If the main reinforcement is too large to be cut, use a pickaxe to break it and then cut it with acetylene gas welding. The demolition sequence is symmetrically demolished from both sides to the middle. In the above step eight, cut the main beams in the same way as the demolition of the secondary beams. Use a pickaxe to remove the concrete of the main reinforcement and cut the main reinforcement with acetylene gas welding. In the above step nine, after completing the demolition of the floor slabs, secondary beams, main beams and staircase components of the gatehouse, demolish the back-topping full hall support frame. In the above step ten, after cutting the connecting floor slabs with the first experimental building, use an excavator breaker to mechanically demolish from top to bottom. In the above step eleven, for horizontal floor transportation, use manual handling. For construction waste, use an excavator to load the truck, and use a transport vehicle to clean it up on the road.

[0006] As a further technical solution of the present invention, in the above step two, compact the soil layer in the formwork cushion area, and after being detected by a third-party testing unit that the compaction degree reaches 0.94, the formwork support cushion can be poured. The formwork support cushion is a 150 mm thick C20 concrete cushion.

[0007] As a further technical solution of the present invention, in the above step two, set up a back-topping full hall support frame. For the beam area, set up the vertical poles according to the requirements in the calculation book. However, for the slab area, the back-topping support frame does not need to be set up to the bottom of the slab, and only needs to be set up to 1.8 m below the slab top elevation and fully paved with formwork to form an operation platform for the subsequent beam demolition construction. At the same time, this platform forms a hard protection to ensure the construction safety of the operators.

[0008] As a further technical solution of the present invention, in step five, an AC8400 concrete wall cutting machine is used to cut the two-sided cantilever slabs (flower bed floor slabs). The cutting is carried out in blocks with a length of 1.45 m and a width of 1 m (weighing about 500 kg). The operator climbs onto the top platform of the support frame, tightens two M30 lifting ring bolts under the floor slab to fix the concrete slab to be lifted, then connects with a lifting U-shaped buckle, and finally uses a 25t crane to transfer it to the ground for stacking.

[0009] As a further technical solution of the present invention, in step five, the demolition sequence is from top to bottom, and the two sides are demolished symmetrically.

[0010] As a further technical solution of the present invention, in step six, an AC8400 concrete wall cutting machine is used to cut the floor slab of the gateway building. The cutting is carried out in blocks with a length of 2 m and a width of 1 m (weighing about 700 kg). The operator climbs onto the top platform of the support frame, tightens two M30 lifting ring bolts under the floor slab to fix the concrete slab to be lifted, then connects with a lifting U-shaped buckle, and finally uses a 25t crane to transfer it to the ground for stacking.

[0011] As a further technical solution of the present invention, in step six, the demolition sequence is symmetrically demolished from both sides to the middle.

[0012] As a further technical solution of the present invention, in step seven, the operator climbs onto the top platform of the support frame, and uses a 480 concrete wall cutting machine to cut the secondary beams of the gateway building. Along the beam length direction with a beam length of 1 m and a beam height of 0.3 m, the cutting is carried out in layers and sections from top. If the main beam bars are too large for the wall cutting machine to cut, an electric pickaxe should be used to pick and break the concrete of this layer of main beam bars, so that the main beam bars are completely exposed and then cut with acetylene gas welding.

[0013] As a further technical solution of the present invention, in step seven, the demolition sequence is to first demolish the vertical secondary beams on both sides, then demolish the horizontal cantilever beams on both sides, then demolish the remaining vertical secondary beams, and finally demolish the horizontal secondary beams. The demolition sequence is symmetrically demolished from both sides to the middle.

[0014] As a further technical solution of the present invention, in step eight, the operator climbs onto the top platform of the support frame, and uses a 480 concrete wall cutting machine to cut the main beam of the gateway building. Along the beam length direction with a beam length of 1 m and a beam height of 0.3 m, the cutting is carried out in layers and sections from top. An electric pickaxe is used to remove the concrete of this layer of main beam bars, so that the main beam bars are completely exposed and then cut with acetylene gas welding.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: in view of the problems of narrow demolition site, dense surrounding buildings, inaccessibility of large-scale demolition machinery and equipment and poor mobility, the present invention proposes the use of machinery with no amplitude or low amplitude for demolition operations, which can effectively avoid disturbance and damage to retained beams, slabs, columns and other structures during the demolition process, thereby ensuring the safety and accuracy of construction. Before demolition, a full-height support frame is first erected to provide a stable operating platform for subsequent demolition operations, thereby improving the efficiency of demolition operations and ensuring the construction safety of workers. At the same time, the formation of the support frame also plays a role of hard protection, further reducing construction risks. For components such as gatehouse beams, cantilever slabs, inclined slabs and platform slabs, the present invention adopts a method of block cutting and lifting. The components are cut into blocks of a certain size by a concrete wall cutter and then lifted by a crane. This method not only avoids the problem that large-scale machinery and equipment cannot enter narrow sites, but also improves the flexibility and efficiency of demolition operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the method of the present invention; Figure 2 This is a schematic diagram of the location of soil removal for green plants in step three of the embodiment; Figure 3 This is a schematic diagram of the positions of removing the stone decorative layer and the leveling layer in step 4 of the embodiment; Figure 4 This is a construction diagram of removing the cantilever plate in step five of the embodiment; Figure 5 This is a schematic diagram of the location of the cantilever plate area in step five of the embodiment; Figure 6 This is a construction diagram of removing the inclined plate and the platform plate in step six of the embodiment; Figure 7 Schematic diagram of the positions of the inclined plate and the platform plate area in step six of the embodiment; Figure 8 This is a construction diagram of the removal of the secondary beam of the gatehouse in step seven of the embodiment; Figure 9 It is a construction schematic diagram of the main beam removal in step eight of the embodiment. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Please refer to the attachedFigure 1 - Attachment Figure 9 An embodiment provided by the present invention: A construction method for demolishing a gatehouse beam slab and a gatehouse staircase, including Step 1, construction preparation; Step 2, erecting a full-span back-supporting formwork; Step 3, removing greenery and soil; Step 4, chiseling off the stone decoration layer and the leveling layer; Step 5, demolishing the cantilever slab; Step 6, demolishing the inclined slab and the platform slab; Step 7, demolishing the secondary beams of the gatehouse; Step 8, demolishing the main beams; Step 9, demolishing the full-span back-supporting formwork; Step 10, demolishing the lower-end staircase of the gatehouse; Step 11, clearing the construction waste; Among them, in the above Step 1, the workers take their positions, prepare the scaffolding materials and auxiliary materials, and the truck crane, wall cutting machine, electric drill, oxygen cutting torch, electric hammer, and small-piece transport vehicle equipment arrive at the site to complete the on-site standardized guardrail enclosure; Among them, in the above Step 2, the soil layer in the formwork cushion area is rammed, and after being tested by a third-party testing unit and the compaction degree reaches 0.94, the formwork cushion of the support can be poured. The formwork cushion of the support is a 150-mm-thick C20 concrete cushion. Erect a full-span back-supporting formwork. The vertical poles in the beam area are erected according to the requirements of the calculation book. However, for the back-supporting formwork in the slab area, the erection height does not need to be erected to the bottom of the slab. It only needs to be erected to 1.8 m below the slab top elevation and the formwork is fully paved to form an operation platform for the later beam demolition construction. At the same time, this platform forms a hard protection to ensure the construction safety of the operators; Among them, in the above Step 3, use a logging saw to cut off the green plants, then manually dig out the roots, remove the green plant planting soil, and use a crane to hoist it to the ground for stacking; Among them, in the above Step 4, chisel off the stone decoration surface layer and use a crane to hoist it to the ground for stacking. Chisel off the leveling layer and hoist it by crane; Among them, in the above Step 5, use an AC8400 concrete wall cutting machine to cut the two cantilever slabs (flower bed floor slabs). Cut them into blocks according to a length of 1.45 m and a width of 1 m (weighing about 500 kg). The operators climb onto the top platform of the support, tighten two M30 lifting ring bolts under the floor slab to fix the concrete slab to be hoisted, then connect it with a lifting U-shaped buckle, and finally use a 25-t crane to transfer it to the ground for stacking. The demolition sequence is from top to bottom, and the two sides are demolished symmetrically; Among them, in the above Step 6, use an AC8400 concrete wall cutting machine to cut the gatehouse floor slab. Cut it into blocks according to a length of 2 m and a width of 1 m (weighing about 700 kg). The operators climb onto the top platform of the support, tighten two M30 lifting ring bolts under the floor slab to fix the concrete slab to be hoisted, then connect it with a lifting U-shaped buckle, and finally use a 25-t crane to transfer it to the ground for stacking. The demolition sequence is symmetrically from both sides to the middle; In the above step 7, the operator climbs onto the top platform of the support frame and uses a 480 concrete wall cutting machine to cut the secondary beam of the gatehouse. Along the beam length direction with a beam length of 1m and a beam height of 0.3m, cut it in layers and sections from top to bottom. If the main beam bars are too large and cannot be cut by the wall cutting machine, an electric pickaxe should be used to pick and break the concrete of this layer of main beam bars until the main beam bars are completely exposed and then cut by acetylene gas welding. The demolition sequence is to first demolish the vertical secondary beams on both sides, then demolish the horizontal cantilever beams on both sides, then demolish the remaining vertical secondary beams, and finally demolish the horizontal secondary beams. The demolition sequence is to demolish symmetrically from both sides to the middle; In the above step 8, the operator climbs onto the top platform of the support frame and uses a 480 concrete wall cutting machine to cut the main beam of the gatehouse. Along the beam length direction with a beam length of 1m and a beam height of 0.3m, cut it in layers and sections from top to bottom, and use an electric pickaxe to remove the concrete of this layer of main beam bars until the main beam bars are completely exposed and then cut by acetylene gas welding; In the above step 9, after completing the demolition work of the gatehouse floor slab, secondary beams, main beams and stair components, the full hall support frame for back topping is demolished; In the above step 10, after cutting the connecting floor slab with the first experimental building, use an excavator breaker to mechanically demolish from top to bottom; In the above step 11, manual handling is used for horizontal transportation on the floor, an excavator is used to load construction waste, and a transport vehicle is used for cleaning on the road.

[0019] Based on the above, the advantages of the present invention are as follows: The present invention has strong adaptability. For complex environments such as narrow access roads, inability of large demolition machinery and equipment to pass, and dense surrounding buildings and poor mobility of the demolition site, this method provides an effective solution and has strong environmental adaptability; it has strong protection. By using machinery with no or low amplitude for demolition, such as using tools like concrete wall cutting machines and electric pickaxes, it effectively avoids disturbing and damaging the retained structures (such as the gatehouse platform, etc.) during the demolition process and protects the safety of surrounding buildings; it is efficient and orderly. The construction steps are clear and definite. From construction preparation to construction waste cleaning, each link has a detailed operation guide, ensuring the efficient and orderly progress of the demolition work. At the same time, the design of the demolition sequence also improves the demolition efficiency; it has high safety. During the demolition process, a full hall support frame for back topping is set up to form an operation platform and hard protection, ensuring the construction safety of the operators. In addition, connecting parts such as lifting ring bolts and lifting U-shaped buckles are also used to enhance the safety of lifting operations; In summary, the construction method for demolishing the gatehouse floor slab and the gatehouse stairs has the advantages of strong adaptability, strong protection, efficient and orderly, and high safety.

[0020] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A construction method for dismantling gatehouse beams and gatehouse stairs, comprising step 1, construction preparation; step 2, setting up a full-house support frame; step 3, removing greenery and soil; step 4, removing the stone decorative layer and the leveling layer; step 5, dismantling the cantilever plate; step 6, dismantling the inclined plate and the platform plate; step 7, dismantling the secondary beam of the gatehouse; step 8, dismantling the main beam; step 9, dismantling the full-house support frame; step 10, dismantling the stairs at the lower end of the gatehouse; step 11, clearing and transporting construction waste; characterized in that: In the above step 1, workers are in place to prepare scaffolding materials and auxiliary materials, and truck cranes, wall cutters, hand drills, oxygen cutting guns, electric hammers, and small transport vehicles are on site to complete the site-standardized guardrail enclosure; In the above step 2, the soil layer in the frame cushion area is compacted and the compaction degree is tested, the support frame is erected, the beam area is erected according to the calculation requirements, and the slab area is erected to a certain height below the slab top elevation to form an operating platform; In the above step 3, the green plants are cut with a logging chainsaw, the roots are dug out manually, the soil for planting the green plants is removed, and the green plants are hoisted to the ground for stacking with a crane; In the above step 4, the stone decorative surface layer is removed and hoisted to the ground for stacking by a crane, and the leveling layer is removed and hoisted by a crane; In the above step 5, a concrete wall cutter is used to cut the cantilever slab and divide it into blocks according to a certain size. The operator tightens the eyebolts, connects them with a lifting U-shaped buckle, and then transports them to the ground with a crane; In the above step 6, a concrete wall cutter is used to cut the gatehouse floor slab and divide it into blocks according to a certain size. The eyebolts are tightened in the same way, connected with a lifting U-shaped buckle, and transported to the ground by a crane; In the above step 7, a concrete wall cutter is used to cut the secondary beam of the gatehouse, and the process is carried out in layers and sections. If the main reinforcement is too large to be cut, an electric pick is used to cut it off and then an acetylene gas welder is used to cut it off. The removal order is symmetrical removal from both sides to the middle; In the above step eight, the main beam is cut in the same way as the secondary beam is removed, the main reinforcement concrete is removed using an electric pick, and the main reinforcement is removed using an acetylene gas welder; In the above step nine, after the gatehouse beams, secondary beams, main beams and staircase components are removed, the top-return full-hall support frame is removed; In the above step 10, after cutting off the beam slab connected to the first experimental building, an excavator breaker hammer is used to mechanically dismantle it from top to bottom; In the above step 11, manual handling is used for horizontal transportation on the floor, construction waste is loaded by excavators, and transport vehicles are used for transportation on the road.

2. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 1, characterized in that: In the step 2, the soil layer in the frame cushion area is compacted, and the compaction degree is tested by a third-party testing unit to reach 0.94 before the support frame cushion can be poured. The support frame cushion is a 150mm thick C20 concrete cushion.

3. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 2, characterized in that: In the step 2, a full-height support frame is erected, and the vertical poles in the beam area are erected according to the calculation requirements. However, the height of the support frame in the slab area does not need to be erected to the bottom of the slab. It only needs to be erected to 1.8m below the elevation of the top of the slab and fully covered with formwork to form an operating platform for the subsequent beam removal construction. At the same time, the platform forms a hard protection to ensure the safety of construction workers.

4. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 1, characterized in that: In the step 5, an AC8400 concrete wall cutter is used to cut the cantilever slabs on both sides, i.e., the flower bed floor slabs, and cut them into blocks with a length of 1.45m, a width of 1m, and a weight of 500kg. The operator climbs onto the top platform of the support frame, tightens two M30 eyebolts under the floor slab to fix it to the concrete slab to be lifted, and then connects it with a lifting U-shaped clip, and finally uses a 25t crane to transport it to the ground for stacking.

5. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 4, characterized in that: In the step 5, the dismantling order is from top to bottom, and the two sides are dismantled symmetrically.

6. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 1, characterized in that: In step six, an AC8400 concrete wall cutter is used to cut the gatehouse floor slab, and the slab is cut into blocks of 2m in length, 1m in width, and 700kg in weight. The operator climbs onto the top platform of the support frame, tightens two M30 eyebolts under the floor slab to fix it to the concrete slab to be lifted, and then connects it with a lifting U-shaped clip, and finally uses a 25t crane to transport it to the ground for stacking.

7. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 6, characterized in that: In step six, the dismantling sequence is symmetrical dismantling from both sides toward the middle.

8. The construction method for dismantling gatehouse beams and gatehouse stairs according to claim 1, characterized in that: In the step seven, the operator climbs onto the top platform of the support frame and uses a 480 concrete wall cutter to cut the secondary beam of the gatehouse. The beam is cut in layers and sections from the top along the length of the beam, with a length of 1m and a height of 0.3m. If the main reinforcement of the beam is too large and cannot be cut by the wall cutter, an electric pick should be used to knock out the concrete of the main reinforcement layer, so that the main reinforcement is completely exposed and then cut with acetylene gas welding.

9. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 8, characterized in that: In the step seven, the demolition sequence is to first demolish the vertical secondary beams on both sides, then demolish the horizontal cantilever beams on both sides, then demolish the remaining vertical secondary beams, and finally demolish the horizontal secondary beams. The demolition sequence is to demolish symmetrically from both sides to the middle.

10. A construction method for dismantling gatehouse beams and gatehouse stairs according to claim 1, characterized in that: In the step eight, the operator climbs onto the top platform of the support frame and uses a 480 concrete wall cutter to cut the main beam of the gatehouse. The beam is 1m long and 0.3m high, and is cut in layers and sections from the top along the length of the beam. An electric pick is used to remove the main reinforcement layer of concrete, so that the main reinforcement is completely exposed and then removed using acetylene gas welding.

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