Cavity type mixed tower fan foundation template construction method

Abstract

The invention discloses a cavity type mixed tower fan foundation formwork construction method. Comprising the steps of cushion layer pouring, pay-off, cavity foundation slab steel bar binding, annular support system erecting, foundation lower inner formwork supporting and inner support frame body arranging, cantilever anchoring end bottom formwork frame body supporting, cantilever anchoring end bottom formwork installing, foundation upper inner formwork supporting and inner support arranging, anchor backing plate and prestressed pipe installing, steel bar binding and annular support system erecting. And a foundation outer formwork is installed. Compared with the prior art, formwork erecting is formed at a time, a foundation is integrally poured, and the overall construction quality is guaranteed; the problem of leakage caused by two-time pouring of a construction joint part is avoided, water stop steel plates are reduced, and materials are saved; the inner supporting frame bodies are radially arranged with the center of the circle and the center of the stand column as a supporting point, and structural stress is reasonable. The supporting frame body is simple in structure, neat, attractive, reasonable in stress and easy to operate, the center stand column is recycled, and construction is efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of the construction of the foundation of a hybrid tower fan, and particularly relates to a construction method for the formwork of the foundation of a cavity-type hybrid tower fan. Background Art

[0002] At present, the wind power foundations all adopt the prestressed anchor cage type foundation in the form of a pure steel cylinder or the cavity type foundation of a steel-concrete composite structure. Especially with the increase of the fan capacity, the fans with large impellers and high hubs are born, and almost all of their wind power fan foundations adopt the cavity type foundation form. The cavity type foundation is characterized by a large weight of the cantilever concrete (generally with a cantilever of 1.0 - 1.3 m and a height of 2 - 2.5 m), belonging to the category of high formwork construction with significant risks. The conventional concrete pouring process for the foundation adopts two pourings, that is, first pour the lower cavity foundation floor slab, and then pour the upper part of the bearing platform foundation. A construction joint is formed between the two pourings. Even if a water stop steel plate is set, it is inevitable to have quality hidden dangers of leakage, affecting the safety of the prestressed system of the steel-concrete tower. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a construction method for the formwork of the foundation of a cavity-type hybrid tower fan, the support frame body has a simple structure, is neat and beautiful, has reasonable stress, is easy to operate, the central column can be reused repeatedly, and the construction is efficient.

[0004] To achieve this technical purpose, the present invention adopts the following scheme: The present invention provides a construction method for the formwork of the foundation of a cavity-type hybrid tower fan, including the following steps: The first step: Pouring the cushion layer and setting out the lines Pour the cushion layer at the designed position of the fan foundation as required. After pouring, measure and set out the lines on the cushion layer; The second step: Binding the steel bars of the cavity foundation floor slab According to the distribution lines set out on the cushion layer, lay the radial steel bars and circumferential steel bars respectively in sequence according to the drawings; The third step: Erecting the annular support system According to the positions of the ring beam support vertical poles set out on the cushion layer, erect the ring beam support vertical poles and the ring beam horizontal cross bars to form an annular support system; The fourth step: Installing the inner formwork of the foundation and setting up the inner support frame body Align and install the customized inner steel formwork of the foundation in sequence according to the inner formwork edge lines, assemble it into a circle, and use the central column to cooperate with the inner support cross bars and inner support connecting rods of the cavity foundation to form an inner support frame body; The fifth step: Erecting the bottom formwork frame of the cantilever anchorage end Insert the vertical pole support into the upper end of the ring beam support vertical pole, and radially place the ring beam support cross bars inside the vertical pole support. The ring beam support cross bars are radially distributed; Step 6: Installation of the bottom formwork at the cantilever anchorage end Adjust the elevation and levelness through the vertical rod support, and then sequentially place the customized fan-shaped steel formwork to form a circular structure; after the installation and adjustment of the bottom formwork at the cantilever anchorage end, mark the positions of the cable anchor holes on the circular formwork; Step 7: Erection of the inner formwork and setting of the inner support on the foundation Erect the inner formwork on the foundation according to the method of erecting the inner formwork under the foundation and the setting of the inner support frame; Step 8: Installation of the anchor backing plate and prestressed pipe Install the anchor backing plate at the positions of the cable anchor holes marked on the bottom formwork at the cantilever anchorage end, and install the prestressed pipe on the anchor backing plate; Step 9: Binding of steel bars After the erection of the entire inner formwork of the cavity is completed, sequentially bind the steel bars at the bottom of the foundation and the upper pedestal column; Step 10: Installation of the outer formwork of the foundation After the binding of the entire foundation steel bars is completed, close the formwork at the bottom of the foundation and around the pedestal column. The outer formwork uses steel formwork.

[0005] Compared with the prior art, the beneficial effects of the present invention are as follows: The formwork erection of the present invention is formed at one time, and the foundation is integrally poured, ensuring the overall construction quality; avoiding the leakage problems caused by the construction joints in the two-time pouring, reducing the water stop steel plates, and saving materials; the inner support frame is arranged in a top support type radial shape with the center column fulcrum of the circle as the center, and the structure is reasonably stressed. The support frame of the present invention has a simple structure, is neat and beautiful, is reasonably stressed, is easy to operate, the center column can be reused repeatedly, and the construction is efficient.

[0006] Further, bottom support vertical rods are arranged inside the cavity foundation bottom plate. The bottom support vertical rods are arranged below the ring beam support vertical rods and are connected to the ring beam support vertical rods.

[0007] Further, a bracket formed by double-sided and double-sided lapping is arranged on the upper part of the bottom support vertical rod. A water stop ring is arranged below the bracket. A cushion plate is arranged at the bottom of the bottom support vertical rod. The cushion plate is arranged on the cushion layer. The ring beam support vertical rod is inserted into the bracket, and the insertion length is not less than 150 mm.

[0008] Further, the center column is arranged at the center position of the fan foundation. A middle column base is arranged at the bottom of the center column. The middle column base is located on the cushion layer.

[0009] Further, anti-slip positioning nails are arranged around the center column. One end of the inner support cross bar of the cavity foundation is inserted into the anti-slip positioning nails, and an adjustable top support is arranged at the other end of the inner support cross bar of the cavity foundation. The two cooperate to adjust and reinforce the formwork; the outer end of the inner support cross bar of the cavity foundation is connected to the inner support connecting rod, and the middle is connected to the ring beam support vertical rod to ensure the stability of the entire inner support frame.

[0010] Furthermore, one end of the upper foundation internal support cross bar is inserted with an anti-slip positioning nail, and the other end is installed with an adjustable jack. The two cooperate to adjust and reinforce the formwork; the outer end of the upper foundation internal support cross bar is connected to the internal support connecting rod, and the middle is connected to the scaffolding vertical pole to form an overall stable internal support frame.

[0011] Furthermore, stud bolts are used to connect the steel formworks.

[0012] Furthermore, during the installation of the outer formwork, steel wire ropes are used in cooperation with manual hoists for locking and reinforcement. Description of the Drawings

[0013] Figure 1 It is a schematic elevation view of the fan foundation formwork construction in the embodiment of the present invention.

[0014] Figure 2 It is a schematic top view of the lower foundation internal support frame in the embodiment of the present invention.

[0015] Figure 3 It is a schematic view of the bottom support vertical pole in the embodiment of the present invention.

[0016] Figure 4 It is a schematic view of the central column in the embodiment of the present invention.

[0017] Figure 5 It is the A-A view.

[0018] Figure 6 It is a schematic view of the fan foundation steel bar arrangement in the embodiment of the present invention.

[0019] Figure 7 It is a schematic view of the cross bar arrangement in the cavity in the embodiment of the present invention.

[0020] Figure 8 It is a schematic view of the internal support cross bar arrangement in the embodiment of the present invention.

[0021] Figure 9 It is a schematic view of the outer formwork locking in the embodiment of the present invention.

[0022] The labels in the figure are: 1, fan foundation; 2, cushion; 3, central column; 301, anti-slip positioning nail; 4, scaffolding vertical pole; 5, ring beam support vertical pole; 6, ring beam horizontal cross bar; 7, upper foundation internal support cross bar; 8, cavity foundation internal support cross bar; 9, bottom support vertical pole; 901, backing plate; 902, water stop ring; 903, bracket; 10, middle column base; 11, ring beam support cross bar; 12, vertical pole support; 13, adjustable jack; 14, steel formwork; 15, foundation ring beam; 16, internal support connecting rod; 17, steel wire rope; 18, manual hoist; 19, anchor backing plate; 20, prestressed pipe. Detailed Embodiments

[0023] To fully understand the purpose, features, and effects of the present invention, the present invention will be described in detail through the following specific embodiments. However, the present invention is not limited thereto.

[0024] See Figures 1 to 9 , the present invention provides a construction method for the formwork of a cavity-type hybrid tower fan foundation, including: cushion pouring, layout - steel bar binding for the cavity foundation bottom slab - erection of the annular support system - erection of the inner formwork and inner support system under the foundation - erection of the bottom formwork support for the cantilever anchorage end - installation of the bottom formwork for the cantilever anchorage end - erection of the inner formwork and inner support on the foundation - installation of the anchor plate and prestressed pipe - steel bar binding - installation of the outer formwork of the foundation. Specifically: The first step: Pouring the cushion 2 and layout Pour the cushion 2 at the designed position of the fan foundation 1 as required. After pouring, measure and layout on the cushion 2. One is to lay out the radial steel bar distribution line at the bottom of the cavity foundation bottom slab and the circumferential steel bar spacing distribution line in the radial direction, and the other is to lay out the positions of the ring beam support vertical poles 5 and the central column 3 and the inner formwork edge line under the fan foundation 1.

[0025] The second step: Steel bar binding for the cavity foundation bottom slab According to the distribution lines laid out on the cushion 2, lay the radial steel bars and circumferential steel bars in sequence according to the drawings.

[0026] The third step: Erection of the annular support system According to the positions of the ring beam support vertical poles 5 laid out on the cushion 2, erect the ring beam support vertical poles 5 and the ring beam horizontal crossbars 6 to form an annular support system. Measure its elevation levelness and the surrounding radian to ensure that there is an appropriate adjustment space for the upright support 12 and the adjustable top support 13.

[0027] Since the concrete of the fan foundation 1 is poured in one go, bottom support vertical poles 9 are set in the cavity foundation bottom slab. The bottom support vertical poles 9 are set at the positions of the ring beam support vertical poles 5 laid out on the cushion 2 and are connected to the ring beam support vertical poles 5. The bottom of the bottom support vertical poles 9 is rooted on the concrete cushion 2, and the bottom support vertical poles 9 are welded and fixed to the bottom and top steel bar meshes of the bottom slab with annular steel bars.

[0028] Furthermore, the bottom support vertical poles 9 are made of φ25 HRB400E deformed steel bars. A double-sided and double-lap formed bracket 903 is provided at the upper part of the bottom support vertical poles 9. A water-swelling type water stop ring 902 is provided at the lower part of the bracket 903 to ensure the waterproof requirement of the concrete bottom slab. A base plate 901 is provided at the bottom of the bottom support vertical poles 9. The base plate 901 is a 60×60×5mm Q235 steel plate base. The base plate 901 is set on the concrete cushion 2. The length of the ring beam support vertical pole 5 inserted into the bracket 903 is not less than 150mm. After the support system is removed, cut off the bottom exposed support head and level it with polymer waterproof mortar.

[0029] Step 4: Erection of the inner formwork template under the foundation and setting of the inner support frame The customized inner steel formwork 14 under the foundation is successively installed in alignment with the inner formwork side line and assembled into a circle. The central column 3, the inner support cross bar 8 of the cavity foundation, and the inner support connecting rod 16 are used in combination to form the inner support frame. The central column 3 is arranged at the center of the fan foundation 1. A central column base 10 is provided at the bottom of the central column 3, and the central column base 10 is rooted on the concrete cushion 2. Anti-slip positioning pins 301 are arranged around the central column 3. One end of the inner support cross bar 8 of the cavity foundation is inserted into the anti-slip positioning pin 301, and an adjustable top support 13 is arranged at the other end of the inner support cross bar 8 of the cavity foundation. The two cooperate to adjust and reinforce the formwork. The outer end of the inner support cross bar 8 of the cavity foundation is connected to the inner support connecting rod 16, and the middle is connected to the ring beam support vertical rod 5 to ensure the stability of the entire inner support frame. The inner steel formworks 14 are connected by stud bolts. The central column 3 can adopt a thick-walled steel pipe with a diameter of more than DN200, and the central column base 10 can adopt a combination of a bottom support vertical rod 9 and a buried part welded together.

[0030] Step 5: Erection of the bottom formwork frame of the cantilever anchorage end Insert the vertical rod support 12 at the upper end of the ring beam support vertical rod 5, and place the ring beam support cross bar 11 radially inside the vertical rod support 12. The ring beam support cross bars 11 are distributed radially.

[0031] Step 6: Installation of the bottom formwork of the cantilever anchorage end Adjust the elevation and level through the vertical rod support 12, and then successively place the customized fan-shaped steel formworks 14 to form a circular ring structure. The fan-shaped steel formworks 14 are connected by stud bolts.

[0032] After the installation of the bottom formwork of the cantilever anchorage end is completed and adjusted, the positions of the cable anchor holes are marked on the circular formwork.

[0033] Step 7: Erection of the inner formwork on the foundation and setting of the inner support Erect the inner formwork on the foundation according to the method of erecting the inner formwork under the foundation and the setting of the inner support frame.

[0034] The central column 3 of the inner support is shared with the lower support frame. One end of the upper inner support cross bar 7 of the foundation is inserted into the anti-slip positioning pin 301, and an adjustable top support 13 is installed at the other end. The two cooperate to adjust and reinforce the formwork. The outer end of the upper inner support cross bar 7 of the foundation is connected to the inner support connecting rod 16, and the middle is connected to the scaffold vertical rod 4 to form an integral and stable inner support frame.

[0035] Furthermore, during the combination of the vertical formwork, the inner formwork horizontal support system shall be installed in a timely manner, which is composed of the central column 3, the scaffold vertical rod 4, and the upper inner support cross bar 7 of the foundation connected together.

[0036] The vertical poles, the inner support cross bars and the inner support connecting rods 16 are all made of Φ48.3×3.6mm steel pipes. The specific number of layers to be set is determined according to the plan. In this embodiment, there are two layers of the foundation in the cavity and three layers of the upper foundation, ensuring that the inner support cross bars of each layer of the foundation are at the same horizontal height and that the inner support cross bars of each upper and lower layer inside are in the same vertical plane.

[0037] Step 8: Install the anchor backing plate 19 and the prestressed pipe 20 Install the anchor backing plate 19 according to the position of the cable anchor hole released on the bottom formwork of the cantilever anchorage end. Install the prestressed pipe 20 on the anchor backing plate 19 and fix it firmly. The prestressed pipe 20 is inside the foundation ring beam 15. The anchor backing plate 19 plays a positioning role and prevents the concrete from being locally crushed when tensioning the prestressed steel bars, dispersing the concentrated force.

[0038] Step 9: Bind the steel bars After the formwork erection in the entire cavity is completed, bind the steel bars at the bottom of the foundation and the upper pedestal columns in sequence.

[0039] Step 10: Install the outer formwork of the foundation After the binding of the entire foundation steel bars is completed, close the formwork at the bottom of the foundation and around the pedestal columns. The outer formwork uses steel formwork 14, and steel wire ropes 17 and manual hoists 18 can be used to lock and reinforce it.

[0040] Finally, it should be noted that: the above-listed are only the preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. Provided that these modifications and variations fall within the scope of the claims of the present invention and its equivalent technologies, they shall be considered as within the protection scope of the present invention.

Claims

1. A construction method for the formwork of a cavity-type hybrid tower fan foundation, characterized in that, It includes the following steps: The first step: Pouring the cushion layer and setting out the lines Pour the cushion layer at the designed position of the fan foundation as required. After pouring, measure and set out the lines on the cushion layer; The second step: Binding the steel bars of the cavity foundation bottom slab According to the distribution lines laid out on the cushion layer, lay the radial steel bars and circumferential steel bars separately in sequence according to the drawings; The third step: Erecting the ring support system According to the positions of the ring beam support vertical poles laid out on the cushion layer, erect the ring beam support vertical poles and the ring beam horizontal crossbars to form a ring support system; The fourth step: Erecting the inner formwork of the foundation and setting up the inner support frame Align and install the customized inner steel formwork of the foundation in sequence according to the inner formwork edge lines, assemble it into a circle, and use the central column to cooperate with the inner support crossbars and inner support connecting rods of the cavity foundation to form an inner support frame; The fifth step: Erecting the bottom formwork support frame of the cantilever anchorage end Insert the vertical pole support into the upper end of the ring beam support vertical pole, and radially place the ring beam support crossbars inside the vertical pole support. The ring beam support crossbars are radially distributed; The sixth step: Installing the bottom formwork of the cantilever anchorage end Adjust the elevation and level through the vertical pole support, and then place the customized fan-shaped steel formwork in sequence to form a circular ring structure; After the installation and adjustment of the bottom formwork of the cantilever anchorage end, mark the positions of the cable anchor holes on the circular formwork; The seventh step: Erecting the inner formwork of the upper part of the foundation and setting up the inner support Erect the inner formwork of the upper part of the foundation according to the method of erecting the inner formwork of the lower part of the foundation and the setting of the inner support frame; The eighth step: Installing the anchor backing plate and the prestressed pipe Install the anchor backing plate at the positions of the cable anchor holes marked on the bottom formwork of the cantilever anchorage end, and install the prestressed pipe on the anchor backing plate; The ninth step: Binding the steel bars After the erection of the entire inner formwork of the cavity is completed, bind the steel bars at the bottom of the foundation and the upper pedestal columns in sequence; The tenth step: Installing the outer formwork of the foundation After the binding of the entire foundation steel bars is completed, close the formwork at the bottom of the foundation and around the pedestal columns. The outer formwork uses steel formwork.

2. The construction method of the cavity-type hybrid tower fan foundation formwork according to claim 1, characterized in that, There are bottom support vertical poles arranged inside the cavity foundation bottom slab. The bottom support vertical poles are arranged below the ring beam support vertical poles and are connected to the ring beam support vertical poles.

3. The construction method of the cavity-type hybrid tower fan foundation formwork according to claim 2, characterized in that, There is a bracket formed by double-sided lap joint at the upper part of the bottom support vertical pole. There is a water stop ring at the lower part of the bracket. There is a base plate at the bottom of the bottom support vertical pole. The base plate is arranged on the cushion layer. The ring beam support vertical pole is inserted into the bracket, and the insertion length is not less than 150 mm.

4. The construction method of the cavity-type hybrid tower fan foundation formwork according to claim 1, characterized in that, The central column is arranged at the center position of the fan foundation. There is a central column base at the bottom of the central column. The central column base is located on the cushion layer.

5. The construction method of the cavity-type hybrid tower fan foundation formwork according to claim 4, characterized in that, Anti-slip positioning nails are arranged around the central column. One end of the inner support crossbar of the cavity foundation is inserted into the anti-slip positioning nails. There is an adjustable jack at the other end of the inner support crossbar of the cavity foundation. The two cooperate to adjust and reinforce the formwork; The outer end of the inner support crossbar of the cavity foundation is connected to the inner support connecting rod, and the middle is connected to the ring beam support vertical pole to ensure the stability of the entire inner support frame.

6. The construction method of the cavity-type hybrid tower fan foundation formwork according to claim 4, characterized in that, One end of the upper part of the inner support crossbar of the foundation is inserted into the anti-slip positioning nails, and an adjustable jack is installed at the other end. The two cooperate to adjust and reinforce the formwork; The outer end of the upper part of the inner support crossbar of the foundation is connected to the inner support connecting rod, and the middle is connected to the scaffold vertical pole to form an overall stable inner support frame.

7. The construction method of the cavity-type hybrid tower fan foundation formwork according to claim 1, characterized in that, The steel formworks are connected by stud bolts.

8. The construction method of the cavity-type hybrid tower fan foundation formwork according to claim 1, characterized in that, During the installation of the outer formwork, a steel wire rope and a manual hoist are used for locking and reinforcement.

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