Method for erecting ultrahigh floor type scaffold in continuous multi-layer cooling tower

Abstract

The invention discloses a method for erecting an ultrahigh floor type scaffold in a continuous multi-layer cooling tower. A full hall type floor type scaffold is erected in the cooling tower, a scaffold body is erected through a steel pipe, construction scaffolds are erected on the periphery of the cooling tower, access channels are arranged on the two sides of a tower body, and the ends of the access channels are connected with the outer wall of the tower through wall connecting rods; the frame body is constructed layer by layer according to construction layers during erection, the frame body is not dismantled after construction of each layer is completed, and the vertical rods are arranged in a full-length mode, that is, the vertical rods on the 7m layer fall on a foundation raft; the positions of the beams of the 13m layer and the roof layer completely correspond to each other, the vertical rods of the frame body also fall on the foundation raft, and the added reinforcing vertical rods fall on the constructed beams of all the layers. The full hall type floor scaffold main body supporting system is provided for a structure with beams and without plates on internal floors of a continuous multi-layer cooling tower, and the stability and the construction efficiency of overall construction of the cooling tower are improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for erecting an ultra-high ground-type scaffold in a continuous multi-layer cooling tower. Background Art

[0002] Continuous multi-layer cooling tower is widely used in large coking plants, large salt chemical plants and other similar factories and mines due to its good water-saving, economy and durability. It consists of a cast-in-place reinforced concrete water storage tank, a tower body (including main beam, ring beam, inner and outer walls), a sprinkler device and ancillary supporting devices.

[0003] Because the continuous multi-layer cooling tower has a high tower height and thin walls, a large span, and different layer heights, the vertical transportation volume of the inner and outer walls of the tower is large, the construction is high-altitude work, and a large amount of turnover materials are consumed, which are basically a one-time amortization. Special construction technology and equipment are required, the construction process is complicated, and the construction is difficult. Summary of the invention

[0004] In order to solve the problem of how to use on-site materials to economically and effectively erect scaffolding supported by beams but no plate formwork in complex towers in small and medium-sized cooling towers, the present invention provides a method for erecting ultra-high ground-standing scaffolding in a continuous multi-layer cooling tower.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for erecting an ultra-high floor-standing scaffold in a continuous multi-layer cooling tower comprises the following steps: The cooling tower includes a top plate and a tower wall. The 7m and 13m layers are plate-free beam frame structures. The 11m layer has drainage ditches on both sides of the frame. The 15m layer is a roof layer. A full-height floor-standing scaffolding is set up inside the cooling tower. The main body of the scaffolding is set up through steel pipes. Construction scaffolding is set up around the cooling tower. The access passage is arranged on both sides of the tower body. The ends of the access passage are connected to the outer wall of the tower through wall connecting rods. The frame is erected layer by layer according to the construction layer. After each layer is completed, the frame is not dismantled, and the poles are set up in full length, that is, the poles of the 7m layer fall on the foundation raft; the beam positions of the 13m layer and the roof layer are completely corresponding, and the frame poles also fall on the foundation raft, and the added reinforcement poles fall on the completed beams of each layer; A lightning protection round steel is provided in the column of the tower wall and penetrates up and down, and a steel bar anchor claw of at least one embedded steel plate connected to the wall connecting rod is welded to the lightning protection round steel.

[0006] Furthermore, one end of the wall connecting rod is connected to the embedded steel plate, and the other end is connected to the steel pipe at the end of the access passage through a fastener.

[0007] Furthermore, the access passage is provided with a zigzag access ladder and a turning platform, and a ladder shaft is provided between the access ladder and the turning platform.

[0008] Furthermore, at the 7m floor, the scaffolding supporting the bottom formwork of the beam is: the secondary keel is a 40×80mm wooden square, with a total of 4 pieces at the bottom of the beam; the main keel is a Φ48×3.0mm steel pipe with a spacing of 700mm; 2 rows of vertical poles are set at the bottom of the beam, with a spacing of 700mm between the vertical poles; the scaffolding of the side formwork of the beam is: the secondary keel is a 40×80mm wooden square with a vertical spacing of 200mm; the main keel is a Φ48×3.0mm double steel pipe with a horizontal spacing of 300mm.

[0009] Furthermore, at the 11m floor, the supporting scaffolding for the cantilevered ditch slab beams outside the towers on both sides is: the secondary keel is 40×80mm wooden square, with a total of 10 pieces at the bottom; the main keel is Φ48×3.0mm steel pipe with a spacing of 400mm; the support height is 7.0m and 11.0m; the supporting scaffolding for the cantilevered section beam side formwork is: the secondary keel is 40×80mm wooden square, with a vertical spacing of 100mm; the main keel is Φ48×3.0mm double steel pipe with a horizontal spacing of 400mm.

[0010] Furthermore, the position of the beam at the 13m floor completely corresponds to that at the 7m floor. During construction, the supporting vertical poles in the beam are shared with the beam body below and fall on the foundation raft.

[0011] Furthermore, the floor at the 15m level: the floor thickness is 100mm, the main keel is 40×80mm wooden square, the secondary keel is 40×80mm wooden square, the spacing is 300mm, the vertical distance of the scaffolding uprights is 0.7m, the horizontal distance of the uprights is 0.7m, the horizontal bar pitch is 1.5m, the top horizontal bar is less than 500mm from the formwork support point, and the protruding length of the jacking screw is less than 200mm.

[0012] Furthermore, at the 15m level, the scaffolding support for the tower top ring beam formwork is as follows: 40mm×80mm×3000mm square timber is neatly laid according to the design spacing requirements, and then the beam bottom formwork is laid. When laying, it is first connected to the column head and nailed firmly, and 40㎜×80mm square timber strips are used as vertical files and vertical file supports. Then the side formwork is hung straight. According to the different cross-sectional areas of the beams, φ14 through-wall screws are added in the middle of the beam height. For the curved beam, 35mm×75mm×3000mm square timber is first neatly laid on the ring steel bar mold, and it is fixed step by step with iron side form hooks. Then a steel pipe is used to push against the ring beam side formwork and converge at the center of the circle and fixed to the vertical pole.

[0013] Aiming at the structure with beams but no plates on the internal floors of a continuous multi-layer cooling tower, the present invention proposes a full-height ground-type scaffolding main body support system, thereby improving the stability and construction efficiency of the overall construction of the cooling tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0015] Figure 1 is an elevation view of a cooling tower according to the present invention; Figure 2 This is a schematic diagram of the 7m-story beam support. Figure 2 (a) is a schematic diagram of the side support. Figure 2 (b) is a schematic diagram of the front support; Figure 3 This is a schematic diagram of the scaffolding support for the 7m-storey cantilevered inclined slab beam; Figure 4 This is a schematic diagram of the scaffolding support for the cantilevered ditch outside the 11m-story tower; Figure 5 This is a schematic diagram of the 13m beam support. Figure 5 (a) is a schematic diagram of the side support. Figure 5 (b) is a schematic diagram of the front support; Figure 6 This is a schematic diagram of the 15m layer formwork scaffolding support; Figure 6 (a) is a plane diagram. Figure 6 (b) Figure 6 (a) Section 1-1, Figure 6 (c) Figure 6 (a) Section 2-2; Figure 7 This is a schematic diagram of the Master's passage.

[0016] In the figure, 1-formwork; 2-wooden planks; 3-top support; 4-vertical poles; 5-transverse horizontal poles; 6-longitudinal horizontal poles; 7-scissors braces; 8-sweeping poles; 9-boards; 10-beams. DETAILED DESCRIPTION

[0017] The cooling tower involved in this embodiment is a cast-in-place reinforced concrete inner and outer wall with complex and varied shapes, such as Figure 1 As shown, the main structure of the cooling tower is 5 layers, reinforced concrete frame support structure, the pit bottom elevation is -0.75m, there is a water collection well in some parts (-2.5m, channel steel is used for layout, and the pole is erected on the channel steel), and the depth of the drainage ditch is -1.35m. The first layer is 2.15m high and 1.40m high; the second layer is 5.6m high and 7.00m high; the third layer is 2.45m high and 9.45m high; the fourth layer is 3.55m high and 13.00m high; the roof is 2.00m high and 15.00m high.

[0018] Among them, the second to fourth floors are plate-free frame structures. The B axis, 1 axis, 3 axis, 5 axis, 7 axis, and 8 axis are designed as 150mm wide shear walls along the full height. The maximum cross-sectional size of the beam is 300mm*800mm, the maximum cross-sectional size of the frame column is 650mm*650mm, the cross-sectional width of the structural edge column and the shear wall is 400mm, the plate thickness is 100mm, and the full-floor frame is supported on the concrete raft. Two ditches are cantilevered between 9m-10m on both sides of the building, with a cantilever length of 1.2m and a height of 1.5m. The cross-sectional size of the roof frame beam is 300mm*800mm, and a 300mm*750mm ring beam is arranged on the B axis. The building is surrounded by cantilevered beams and slabs. The maximum cantilevered length of the 15m-story roof is 2.950m, and the maximum slab thickness is 130mm. There are drainage ditches on the east and west sides of the 11m-story frame. The ditch width is 1050mm, the height is 1700mm, and the beam there is 200*400mm.

[0019] In this embodiment, since there are beams but no plates on the internal floors of the cooling tower, the scaffolding adopts an integral ground-based support method. The scaffolding body is erected by steel pipes, and the steel pipes of the scaffolding body include uprights 4, crossbars, vertical scissor braces and horizontal scissor braces connected by fasteners.

[0020] Scaffolding is set up around the cooling tower for use in the construction process of formwork, steel bars, concrete, etc. The vertical and horizontal transportation of construction materials, turnover materials, etc. are all completed by tower cranes.

[0021] The frame is connected to the inner frame, and the support pole 4 falls on the backfill soil. When the frame is erected, it is constructed layer by layer according to the construction layer. After each layer is completed, the frame is not dismantled. The pole 4 is set up in full length, that is, the pole 4 of the 7m layer falls on the foundation raft slab, and the beam positions of the 13m layer and the roof layer are completely corresponding, so the frame poles also fall on the foundation raft slab, and the added reinforcement poles fall on the beams of each layer.

[0022] A lightning protection round steel bar is provided in the column of the tower wall, and at least one steel bar anchor claw of the embedded steel plate connected to the wall connecting rod is welded to the lightning protection round steel bar to form a lightning protection system for the scaffold body. Specifically, one end of the wall connecting rod is connected to the embedded steel plate, and the other end is connected to the steel pipe at the end of the access passage through a fastener.

[0023] In a relatively specific implementation manner, the method for erecting an ultra-high ground-standing scaffold in a continuous multi-layer cooling tower described in the present invention is as follows.

[0024] Scaffolding layout: First construct the reinforced concrete pool floor, the ground-type full-floor scaffolding is arranged to stand on the cooling tower pool floor, the crossbar is placed on the inside of the vertical pole 4, the crossbar is fastened with the vertical pole 4 with a right-angle fastener, the crossbars are connected with the crossbars with butt fasteners, and the vertical and horizontal sweeping rods 8 are set at the bottom. The top elevation of the water pool under the tower is 1.4m.

[0025] The 7m layer is a non-plate beam. Figure 2 As shown, the scaffolding uprights 4 used fall on the foundation raft slab. Channel steel is set under the uprights 4 at the bottom water collection well and other places. The beam formwork 1 and support frame are designed as follows: the cross-sectional size of the beam is 400×900mm, and the beam bottom formwork support scaffolding is: (1) The secondary keel is 40×80mm wooden square, with a total of 4 pieces at the bottom of the beam; (2) The main keel is made of Φ48×3.0mm steel pipe with a spacing of 700mm; (3) Two rows of uprights 4 are set at the bottom of the beam, and the spacing of the uprights 4 is 700mm. The beam side formwork scaffolding is: (1) The secondary keel is 40×80mm wooden square, with a vertical spacing of 200mm; (2) The main keel is made of Φ48×3.0mm double steel pipe, with a horizontal spacing of 300mm. There are 6 M14 tension bolts, with a spacing of 300mm+300mm from bottom to top, and a spacing of 450mm along the beam span, see Figure 2 See the 7m-story cantilever water retaining inclined slab beam support scaffolding for details. Figure 3 .

[0026] like Figure 4 As shown, the supporting scaffolding for the cantilevered gutter slab beams on both sides of the 11m-level tower is as follows: (1) The secondary keel is made of 40×80mm wooden squares, with a total of 10 at the bottom; (2) The main keel is made of Φ48×3.0mm steel pipes with a spacing of 400mm; (3) The supporting height is 7.0m and 11.0m. The supporting scaffolding for the cantilevered beam side formwork on the 11m-level is as follows: (1) The secondary keel is made of 40×80mm wooden squares with a vertical spacing of 100mm; (2) The main keel is made of Φ48×3.0mm double steel pipes with a horizontal spacing of 400mm. (3) There are 5 M14 tension bolts, with a spacing of 200mm from bottom to top, and a span spacing of 450mm. The horizontal bar pitch under the beam slab should be increased by an additional longitudinal and transverse horizontal bar 5 between the top pitches. The cantilever of the vertical bar 4 extending out of the horizontal bar at the top level should not be greater than 500.

[0027] The position of the beams on the 13m floor corresponds exactly to that on the 7m floor, e.g. Figure 5 As shown, during construction, the vertical pole 4 supporting the beam is shared with the beam below and falls on the foundation raft. Since the interlayer beam of the circulating water cooling tower is a plateless beam, the maximum size of the beam is 350*850mm, so the height-to-width ratio of the interlayer beam formwork is not greater than 3, which meets the requirements.

[0028] The 15m layer is the roof layer, and the floor thickness is 100mm. Figure 6As shown, the floor support scaffolding is: the main keel is 40×80mm wood square, the secondary keel is 40×80mm wood square, the spacing is 300mm, the vertical distance of the scaffolding pole 4 is 0.7m, the horizontal distance of the pole 4 is 0.7m, the horizontal pole step is 1.5m, the top horizontal pole is less than 500mm from the support point of the template 1, and the top support screw rod extends less than 200mm. Scaffolding support for the tower top ring beam template 1: neatly lay 40mm×80mm×3000mm square wood 2 according to the design spacing requirements, and then lay the beam bottom formwork. When laying, it should be connected with the column head and nailed firmly, and 40㎜×80mm square wood strips should be used as vertical files and vertical file supports, and the template 1 with a width of about 30mm and a thickness of 12mm is used as a presser foot to press the bottom of the side formwork (or use an iron side form hook to tighten step by step instead of the side form presser foot). Then hang the side formwork straight, and add a φ14 through-wall screw in the middle of the beam height according to the different cross-sectional areas of the beam. The curved beam first lays 35mm×75mm×3000mm square wood 2 neatly on the circular steel bar mold, and uses the iron side mold hook to tighten it step by step, then uses the steel pipe to push the side mold of the ring beam and converge at the center of the circle, and fix it with the vertical pole 4. In order to ensure that the beam does not sink or deform and other quality accidents, one to two rows of vertical poles 4 are added in the middle of the bottom mold of the beam to connect with the high support mold frame.

[0029] The access passage is arranged on both sides of the tower body, and the ends of the access passage are connected to the outer wall of the tower through a wall connecting rod. The access passage is provided with a zigzag access ladder and a turning platform, and a ladder shaft is between the access ladder and the turning platform.

[0030] The width of the pedestrian ramp shall not be less than 1m, and the slope is preferably 1:3. A platform shall be set at the corner, and its width shall not be less than the width of the ramp; handrails and footboards shall be set on both sides of the ramp and the periphery of the platform. The height of the handrail is 1.2m, and the height of the footboard is not less than 180mm; wall ties shall be set at 2 steps and 2 spans on both sides of the material transport ramp, the periphery of the platform and the end, and horizontal diagonal bars shall be added every two steps, and scissor braces 7 and transverse diagonal braces shall be set continuously.

[0031] When the scaffolding boards are laid horizontally, longitudinal support bars shall be added under the horizontal bars 5, and the spacing between the longitudinal support bars shall not be greater than 500mm; Figure 7 As shown, when scaffolding boards are laid, the joints should be overlapped; the lower board head should press the upper board head, and the convex edges of the board heads should be filled with triangular wood; an anti-slip wooden strip should be set every 250~300mm on the scaffolding boards of pedestrian ramps and material transport ramps, and the thickness of the wooden strip should be 20~30mm.

[0032] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for erecting ultra-high floor-standing scaffolding in a continuous multi-layer cooling tower, characterized in that , including the following steps: The cooling tower includes a top plate and a tower wall. The 7m and 13m layers are plate-free beam frame structures. The 11m layer has drainage ditches on both sides of the frame. The 15m layer is a roof layer. A full-height floor-standing scaffolding is set up inside the cooling tower. The main body of the scaffolding is set up through steel pipes. Construction scaffolding is set up around the cooling tower. The access passage is arranged on both sides of the tower body. The ends of the access passage are connected to the outer wall of the tower through wall connecting rods. The frame is erected layer by layer according to the construction layer. After each layer is completed, the frame is not dismantled, and the poles are set up in full length, that is, the poles of the 7m layer fall on the foundation raft; the beam positions of the 13m layer and the roof layer are completely corresponding, and the frame poles also fall on the foundation raft, and the added reinforcement poles fall on the completed beams of each layer; A lightning protection round steel is provided in the column of the tower wall and penetrates up and down, and a steel bar anchor claw of at least one embedded steel plate connected to the wall connecting rod is welded to the lightning protection round steel.

2. The method according to claim 1, characterized in that: One end of the wall connecting rod is connected to the embedded steel plate, and the other end is connected to the steel pipe at the end of the access passage through a fastener.

3. The method according to claim 2, characterized in that: The access passage is equipped with a zigzag ladder and a turning platform, and there is a stairwell between the ladder and the turning platform.

4. The method according to claim 1, 2 or 3, characterized in that: At the 7m floor, the scaffolding supporting the bottom formwork of the beam is as follows: the secondary keel is a 40×80mm wooden square, with a total of 4 pieces at the bottom of the beam; the main keel is a Φ48×3.0mm steel pipe with a spacing of 700mm; there are 2 rows of vertical poles at the bottom of the beam, with a spacing of 700mm between the vertical poles; the scaffolding for the side formwork of the beam is as follows: the secondary keel is a 40×80mm wooden square with a vertical spacing of 200mm; the main keel is a Φ48×3.0mm double steel pipe with a horizontal spacing of 300mm.

5. The method according to claim 4, characterized in that: At the 11m floor, the supporting scaffolding for the cantilevered ditch slab beams outside the towers on both sides is: the secondary keel is 40×80mm wooden square, with a total of 10 pieces at the bottom; the main keel is Φ48×3.0mm steel pipe with a spacing of 400mm; the support height is 7.0m and 11.0m; the supporting scaffolding for the cantilevered section beam side formwork is: the secondary keel is 40×80mm wooden square, with a vertical spacing of 100mm; the main keel is Φ48×3.0mm double steel pipe with a horizontal spacing of 400mm.

6. The method according to claim 5, characterized in that: The position of the beam at the 13m floor completely corresponds to that at the 7m floor. During construction, the supporting vertical poles in the beam are shared with the beam below and fall on the foundation raft.

7. The method according to claim 6, characterized in that: Floor at 15m level: floor thickness 100mm, main purlin is 40×80mm wooden square, secondary purlin is 40×80mm wooden square, spacing is 300mm, vertical distance of scaffolding uprights is 0.7m, horizontal distance of uprights is 0.7m, horizontal bar spacing is 1.5m, the top horizontal bar is less than 500mm from the formwork support point, and the protruding length of the top support screw is less than 200mm.

8. The method according to claim 7, characterized in that: At the 15m floor, the scaffolding support for the ring beam formwork at the top of the tower: 40mm×80mm×3000mm square timber is neatly laid according to the design spacing requirements, and then the bottom formwork of the beam is laid. When laying, it is first connected with the column head and nailed firmly, and 40㎜×80mm square timber strips are used as vertical files and vertical file supports. Then the side formwork is hung straight. According to the different cross-sectional areas of the beams, φ14 through-wall screws are added in the middle of the beam height; for the curved beam, 35mm×75mm×3000mm square timber is first neatly laid on the circular steel bar mold, and it is fixed step by step with iron side form hooks, and then a steel pipe is used to push on the side formwork of the ring beam and converge at the center of the circle and fixed with the vertical pole.

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