Construction Method of Tall and Heavy Load Aerial Formwork Support System

Abstract

The present invention relates to the technical field of support system construction, specifically a construction method for an aerial high and heavy formwork support system, which includes the following steps: embedding anchor bolts, erecting a vertical support system. The vertical support system is composed of several layers of columns. The columns of the same layer are connected by horizontal tie rods. The upper and lower ends of the columns are connected by connecting flanges, connecting bolts and connecting nuts; a support platform is installed on the vertical support system, and a number of socket cylinders are arranged on the support platform; struts are inserted into the socket cylinders at preset positions, and a number of struts together form an external support for the formwork for pouring. An internal support, structural steel bars and a formwork for pouring are provided. The present invention uses a combination of a vertical support system and a support platform to replace the full hall scaffold. The combination of the vertical support system and the support platform can be installed, disassembled and rebuilt multiple times, realizing the turnover of construction materials and reducing the construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of support system construction, and specifically relates to a construction method for an aerial high and heavy formwork support system. Background Art

[0002] During construction, large concrete funnels are characterized by large volume and heavy mass, and are usually constructed by in-situ casting; before pouring concrete, it is necessary to bind steel bars and install formwork for pouring. Since the concrete funnel needs to be suspended, the setting of the formwork support system usually becomes the key and difficult points in construction. In existing construction, a full hall scaffold is used as the support system for support. For the construction of suspended concrete structures with large volume and heavy mass, such as large concrete funnels, cantilever beams, etc., in order to ensure the support performance and prevent deformation after concrete pouring, the step distance and span of the vertical poles will be reduced; therefore, the existing aerial high and heavy formwork support system has defects such as more materials used, long operation time, inconvenient installation and removal operations, etc., which affect the construction progress and the economy is worrying. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a construction method for an aerial high and heavy formwork support system that is convenient and fast for support and has strong turnover performance.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] A construction method for an aerial high and heavy formwork support system includes the following steps:

[0006] S1, embedding anchor bolts: Pour the foundation raft and embed anchor bolts at preset positions in the foundation raft;

[0007] S2, erection of the vertical support system: The vertical support system is composed of several layers of columns. The columns are installed layer by layer. The columns of the same layer are connected by horizontal tie rods. Connecting flanges are provided at the upper and lower ends of the columns. The upper and lower layers of columns are connected by connecting flanges, connecting bolts and connecting nuts. Between the lowermost layer of columns and the foundation raft, they are connected by connecting flanges, anchor bolts and connecting nuts;

[0008] S3, installation of the support platform: Install the support platform on the vertical support system, and several insertion cylinders are arranged on the support platform;

[0009] S4, formwork erection: Insert struts on the insertion cylinders at preset positions. Several struts together form the external support of the formwork for pouring, and set internal supports, structural steel bars and formwork for pouring;

[0010] S5, concrete pouring: Pour concrete. After reaching the form removal strength, remove the internal support, external support and formwork for pouring;

[0011] S6, Demolition of the support system: Demolish the underpinning platform and the vertical support system.

[0012] Preferably, in step S1, the steps of embedding anchor bolts include: pouring the cushion layer of the foundation raft; after the pouring of the cushion layer of the foundation raft is completed, project the cross-shaped center line points on it, and preliminarily position the anchor bolts according to the center line points, tie the raft steel bars, and fix the anchor bolts on the raft steel bars according to the center line points; in order to prevent damage to the threads of the anchor bolts, it is advisable to use protective sleeves to protect the threads of the anchor bolts; in order to ensure the correct position and elevation of the anchor bolts, watch and observe during concrete pouring, and if any changes are found, notify the construction personnel in time for handling.

[0013] Preferably, in step S2, the specific process of installing the columns layer by layer is that each layer of columns in a transverse bay is a hoisting unit, and each hoisting unit needs to be pre-assembled integrally on the ground, and the columns of each layer are connected and fixed by transverse tie beams; install layer by layer from bottom to top, and the bottom layer of columns is connected and fixed to the anchor bolts through connecting nuts. After each layer of columns is installed in place, adjust the installation elevation of the next layer of columns by adding cushion plates on the top of the columns.

[0014] Preferably, in step S3, the support platform includes an underpinning platform and a column top platform, and both the underpinning platform and the column top platform are made of I-beams. The specific installation process includes;

[0015] S301: First install the underpinning platform. The underpinning platform is in a mesh structure and is connected and fixed to the connecting flange at the top of the vertical support system through connecting bolts. When connecting the underpinning platform and the vertical support system, tighten the connection nodes along the longitudinal axis from the middle to both ends;

[0016] S302: After the underpinning platform is fixed, install the column top platform on the underpinning platform. The column top platform consists of an intermediate section fixed to the underpinning platform and extension sections connected to both sides of the intermediate section. The intermediate section includes several first cross beams, and the extension sections include several second cross beams. The second cross beams are connected to both ends of the first cross beams and are coaxially arranged with the first cross beams; the insertion cylinders are arranged on the upper flanges of the first cross beams and the second cross beams; several through holes are arranged at intervals along the length direction of the second cross beams, and the full-length longitudinal ribs are inserted through the through holes. The full-length longitudinal ribs are perpendicular to the second cross beams and provide further connection for several second cross beams on the left or right side of the intermediate section.

[0017] Preferably, walkway plates are laid in the gaps between the first cross beams and the gaps between the second cross beams; it is convenient for construction personnel to walk on the support platform.

[0018] Preferably, both ends of the web of the first cross beam are hingedly connected to the end of the web of the second cross beam through a pin shaft seat and a pin shaft; limiting plates are further provided on the top surfaces of both ends of the upper flange plate of the first cross beam and the bottom surfaces of both ends of the lower flange plate; a diagonal bracing rod is further included, the lower end of the diagonal bracing rod is hinged to the column of the vertical support system, and the upper end is hinged to the lower flange plate of the extension joint second cross beam; after the intermediate section and the underpinning platform are fixed in step S302, it further includes; S303: the output end of the diagonal bracing extends, and extends until the extension joints on both sides and the intermediate section are on the same horizontal plane. At this time, the upper flange of the second cross beam fits under the limiting plate of the first cross beam, and the limiting plate and the upper flange of the second cross beam are fixed by bolts.

[0019] Preferably, the diagonal bracing is a jack push rod or a hydraulic push rod.

[0020] The present invention adopting the above technical solution, compared with the prior art, its prominent features are:

[0021] The present invention uses a combination of a vertical support system and a support platform to replace the full hall formwork. The combination of the vertical support system and the support platform can be installed, disassembled and modified multiple times, realizing the turnover of construction materials and reducing the construction cost; in addition, the tooling designed by this construction method is easy to modify and can also be applied to the support system of conventional high formwork for beams and slabs; compared with erecting a full hall formwork, this method can greatly shorten the construction period, is safe and efficient, saves a large amount of manpower and material resources, and creates good conditions for the further development of the project. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the vertical support system in the embodiment of the present invention;

[0023] Figure 2 is a schematic connection structure diagram of the support platform and the vertical support system in the embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of the underpinning platform in the embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of the column top platform in the embodiment of the present invention;

[0026] Figure 5 is another schematic structural diagram of the column top platform in the embodiment of the present invention;

[0027] Figure 6 is a schematic connection structure diagram of the first cross beam and the second cross beam in the embodiment of the present invention;

[0028] Figure 7 is a schematic structural diagram of the high and heavy formwork support system in the air in the embodiment of the present invention.

[0029] Description of reference numerals: 1, vertical column; 2, horizontal tie rod; 3, connecting flange; 4, underpinning platform; 401, connecting bottom plate; 5, column top platform; 501, first cross beam; 502, second cross beam; 503, continuous longitudinal rib; 6, diagonal brace; 7, pin shaft seat; 8, limit plate; 9, connecting ear; 10, insertion cylinder; 11, external support; 12, casting formwork; 13, jack. Detailed implementation manners

[0030] The present invention will be further described below in conjunction with specific embodiments. The purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0031] As Figures 1 to 7 shown, this embodiment provides a construction method for an aerial high and heavy load formwork support system, including the following steps:

[0032] S1, embedding anchor bolts: Pour the foundation raft slab and embed anchor bolts at preset positions in the foundation raft slab; specifically, it includes:

[0033] S101: Pour the cushion layer of the foundation raft slab.

[0034] S102: Project the cross-shaped center line points on the cushion layer of the foundation raft slab, and preliminarily position the anchor bolts according to the center line points.

[0035] S102: Bind the raft slab steel bars, and fix the anchor bolts on the raft slab steel bars according to the center line points; first, preliminarily bind and fix the anchor bolts to the raft slab steel bars, then conduct position review. After the review is completed, weld and fix the anchor bolts to the raft slab steel bars. To prevent damage to the threads of the anchor bolts during welding and concrete pouring, it is advisable to use protective sleeves to protect the threads of the anchor bolts; to ensure the correct position and elevation of the anchor bolts, watch and observe should be carried out during the pouring of the raft slab concrete. If any change is found, the construction personnel should be notified immediately for timely handling.

[0036] S2, erection of the vertical support system: As Figure 1 shown, the vertical support system is composed of several layers of vertical columns 1. The vertical columns 1 are installed layer by layer. Connecting flanges 3 are provided at the upper and lower ends of the vertical columns 1. The upper and lower layers of vertical columns 1 are connected through the connecting flanges 3, connecting bolts and connecting nuts. Between the lowermost vertical column 1 and the foundation raft slab, they are connected through the connecting flange 3, anchor bolts and connecting nuts.

[0037] In step S2, the specific process of installing the columns 1 layer by layer is as follows: for each layer, one lateral bay of columns 1 is taken as a hoisting unit. Each hoisting unit needs to be pre-assembled integrally on the ground. A number of columns 1 on each layer are connected and fixed by transverse tie beams. The installation is carried out layer by layer from bottom to top. The bottommost columns 1 are connected and fixed to the anchor bolts through connecting nuts. After each layer of columns 1 is installed in place, the installation elevation of the next lower layer of columns 1 is adjusted by adding cushion plates on the tops of the columns 1.

[0038] S3. Installation of the support platform: As Figure 2 shown, install the support platform on the vertical support system. A number of socket cylinders 10 are arranged on the support platform. Among them, the support platform includes a replacement platform 4 and a column top platform 5, and both the replacement platform 4 and the column top platform 5 are made of I-beams.

[0039] The specific installation process of the support platform includes:

[0040] S301: First, install the replacement platform 4. As Figure 3 shown, the replacement platform 4 has a mesh structure, and the I-beams arranged horizontally and vertically on the replacement platform 4 are welded and fixed. A connecting bottom plate 401 is provided at the bottom of the replacement platform 4 corresponding to the connecting flange 3 at the top of the vertical support system. The replacement platform 4 is connected and fixed to the connecting flange 3 at the top of the vertical support system through the connecting bottom plate 401 by connecting bolts and connecting nuts. When connecting the replacement platform 4 to the vertical support system, the connection nodes are tightened from the middle to both ends along the longitudinal axis.

[0041] S302: After the replacement platform 4 is fixed, install the column top platform 5 on the replacement platform 4. As Figure 4 shown, the column top platform 5 is composed of a middle section fixed to the replacement platform 4 and extension sections connected to both sides of the middle section. The middle section includes a number of first cross beams 501, and the extension sections include a number of second cross beams 502. The first cross beams 501 are welded and fixed on the replacement platform 4. The second cross beams 502 are connected to both ends of the first cross beams 501 and are coaxially arranged with the first cross beams 501. A number of socket cylinders 10 are also provided on the column top platform 5. The socket cylinders 10 are arranged perpendicular to the column top platform 5, and the bottoms of the socket cylinders 10 are welded and fixed on the upper flanges of the first cross beams 501 or the second cross beams 502. A number of jacks 13 for supporting the casting formwork 12 are also provided on the first cross beams 501. The jacks can also be replaced by sand boxes or U-shaped supports.

[0042] As Figure 5 shown, a number of through holes are arranged at intervals along the longitudinal direction of the second cross beams 502. A continuous longitudinal rib 503 is inserted through the through holes. The continuous longitudinal rib 503 is arranged perpendicular to the second cross beams 502 to provide further connection for a number of second cross beams 502 in the extension sections on both sides of the middle section. In this embodiment, the diameter of the through holes is 45 mm, the interval is 450 mm, and the continuous longitudinal rib 503 is made of D42 steel pipes.

[0043] Furthermore, as Figure 6 shown, both ends of the web of the first cross beam 501 are hinged to the end of the web of the second cross beam 502 through a pin shaft seat 7 and a pin shaft; limiting plates 8 are arranged on the top surfaces of both ends of the upper flange plate of the first cross beam 501 and on the bottom surfaces of both ends of the lower flange plate; it further includes a diagonal brace 6 rod, the lower end of the diagonal brace 6 rod is hinged to the column 1 of the vertical support system through a connecting ear 9 and a pin shaft, and the upper end is hinged to the lower flange plate of the extended section second cross beam 502 through a connecting ear 9 and a pin shaft; wherein, the diagonal brace 6 can adopt a jack push rod or a hydraulic push rod.

[0044] The column top platform 5 is installed by means of integral hoisting, and four lifting points are set, which are arranged on both sides of the middle section, at the 1 / 5 and 4 / 5 positions of the longitudinal side span midspan.

[0045] S303: After the middle section and the underpinning platform 4 are fixed, the extended sections are installed on both sides of the middle section, and then the diagonal brace 6 is installed. The output end of the diagonal brace 6 extends, so that the extended section and the middle section are on the same horizontal plane. When the middle section and the extended section are connected, the upper flange of the second cross beam 502 is attached to the lower side of the limiting plate 8 of the upper flange of the first cross beam 501, and the lower flange of the second cross beam 502 is attached to the upper side of the limiting plate 8 of the lower flange of the first cross beam 501. The limiting plate 8 and the upper flange and lower flange of the second cross beam 502 are fixed by bolts.

[0046] S304: To facilitate the construction personnel to walk on the support platform, walkway plates are laid in the gaps between the first cross beams 501 and the gaps between the second cross beams 502.

[0047] S4, formwork erection: As Figure 7 shown, struts are inserted on the socket cylinders 10 at the preset positions, and a number of struts together form an external support 11 for the casting formwork 12; an internal support of the structure, structural steel bars and the casting formwork 12 are arranged; in this embodiment, the socket cylinder 10 is made of D63 steel pipe and has a height of 100 mm - 150 mm.

[0048] S5, concrete pouring: During concrete pouring, after reaching the form removal strength, the internal support, the external support 11 and the casting formwork 12 are removed.

[0049] S6, removal of the support system: The steps during removal include;

[0050] S601: First, unload the jack 13 and remove the walkway plates and the continuous longitudinal ribs 503 on the support platform, and then remove the diagonal brace 6.

[0051] S602: Use a chain block to remove the second cross beam 502. One end of the chain block is hung on the embedded plate of the concrete structure, and the other end is hung in the through hole of the web of the second cross beam 502. Remove the connection node of the pin shaft and the limiting plate between the first cross beam 501 and the second cross beam 502, and slowly lower the second cross beam 502 to the ground by using the chain block.

[0052] S603: Connect the first cross beam 501 with a fall chain, with one end of the fall chain hung on the embedded concrete structure plate and the other end hung in the pin hole of the first cross beam 501 .

[0053] S604: Remove the connecting bolts between the bottom column 1 and the second-to-last column 1, use the fall chain to lift the replacement platform 4 and the vertical support system except the first section, disassemble the bottom column 1 one by one, and then lower the vertical support system. At this time, the original second-to-last column 1 is the bottom layer.

[0054] S605: Repeat S604 until only the uppermost columns and the underpinning platform 4 are left, and lower the uppermost columns and the underpinning platform 4 to the ground using a fall chain for dismantling.

[0055] It should be noted that when an external retaining wall is designed on the outside of the aerial concrete structure, if there is a conflict between the supporting platform and the external retaining wall, the external retaining wall needs to be cast and constructed in sections. First, the external retaining wall on the lower side of the supporting platform should be constructed, and then the external retaining wall and rib wall above the supporting platform should be constructed.

[0056] The present invention uses a vertical support system and a support platform to replace the full-floor scaffolding on the lower side of the aerial concrete structure, which makes disassembly and assembly simpler and more convenient, improves construction efficiency, and the system can be used cyclically, saving construction costs.

[0057] The above description is only the preferred embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made by using the contents of the present invention specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A construction method for a high and heavy-loaded aerial formwork support system, characterized in that: The method comprises the following steps: S1, pre-embedded anchor bolts: pouring a foundation raft slab and pre-embedded anchor bolts in the foundation raft slab at preset positions; S2, vertical support system erection: The vertical support system consists of several layers of columns, which are installed layer by layer. The columns on the same layer are connected by horizontal tie rods. The upper and lower ends of the columns are provided with connecting flanges. The upper and lower columns are connected by connecting flanges, connecting bolts and connecting nuts. The lowest column is connected to the foundation raft by connecting flanges, anchor bolts and connecting nuts. S3, support platform installation: install the support platform on the vertical support system, and arrange a number of plug-in tubes on the support platform; In step S3, the supporting platform includes a support platform and a column top platform, both of which are made of I-beams. The specific installation process includes: S301: first install the underpinning platform, which is a mesh structure and is connected and fixed to the connection flange at the top of the vertical support system by connecting bolts. When connecting the underpinning platform and the vertical support system, tighten the connection nodes from the middle to both ends along the longitudinal axis; S302: After the underpinning platform is fixed, a column top platform is installed on the underpinning platform. The column top platform is composed of an intermediate section fixed to the underpinning platform and an extension section connected to both sides of the intermediate section. The intermediate section includes a plurality of first beams, and the extension section includes a plurality of second beams. The second beams are connected to both ends of the first beams and are coaxially arranged with the first beams. The plug-in tube is arranged on the upper flanges of the first beams and the second beams. A plurality of through holes are arranged at intervals along the length of the second beams, and a through-length longitudinal rib is penetrated in the through holes. The through-length longitudinal rib is arranged perpendicular to the second beams to provide further connection for the plurality of second beams on the left or right side of the intermediate section. S4, formwork support: insert the support rods on the plug-in tubes at the preset positions, and several support rods together constitute the outer support of the casting formwork, and set the inner support, structural steel bars and casting formwork; S5, concrete pouring: After the concrete is poured and reaches the demoulding strength, the inner support, outer support and pouring formwork are removed; S6, dismantling of support system: dismantling of the support platform and vertical support system.

2. The construction method of the aerial high and heavy-load formwork support system according to claim 1 is characterized in that: In step S1, the steps of pre-embedding the anchor bolts include: pouring the foundation raft slab cushion layer; after the foundation raft slab cushion layer is poured, projecting a cross-shaped center line point on it, and preliminarily positioning the position of the anchor bolt according to the center line point, tying the raft slab steel bars, and fixing the anchor bolts on the raft slab steel bars according to the center line point; to prevent the anchor bolt threads from being damaged, protective sleeves should be used to protect the anchor bolt threads; to ensure the correct position and elevation of the anchor bolts, supervision and observation should be carried out during concrete pouring, and if any changes are found, the construction personnel should be notified immediately for timely processing.

3. The construction method of the aerial high and heavy-load formwork support system according to claim 1 is characterized in that: In step S2, the specific process of installing the columns layer by layer is as follows: each layer of columns is a horizontal frame as a lifting unit, each lifting unit needs to be pre-assembled on the ground, and each layer of columns is connected and fixed by a horizontal tie beam; install layer by layer from bottom to top, the bottom layer of columns is connected and fixed to the anchor bolts by connecting nuts, and after each layer of columns is installed in place, the installation elevation of the next layer of columns is adjusted by adding a pad on the top of the column.

4. The construction method of the aerial high and heavy-load formwork support system according to claim 1 is characterized in that: Walkway boards are laid in the gaps between the first cross beams and the gaps between the second cross beams.

5. The construction method of the aerial high and heavy-load formwork support system according to claim 1 is characterized in that: The two ends of the web of the first beam are hingedly connected to the ends of the web of the second beam through pin seats and pins; limit plates are also provided on the top surfaces of the two ends of the upper flange plate of the first beam and the bottom surfaces of the two ends of the lower flange plate; it also includes a diagonal brace rod, the lower end of the diagonal brace rod is hinged on the column of the vertical support system, and the upper end is hinged on the lower flange plate of the second beam of the extension section; after the middle section and the support platform are fixed in step S302, it also includes, S303: the output end of the diagonal brace is extended, and the extension sections on both sides are extended to the same horizontal plane as the middle section. At this time, the upper flange of the second beam is attached to the lower side of the limit plate of the first beam, and the limit plate and the upper flange of the second beam are fixed by bolts.

6. The construction method of the aerial high and heavy-load formwork support system according to claim 5 is characterized in that: The diagonal brace adopts jack push rod or hydraulic push rod.

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