Construction method of tower crane foundation of super-high reverse construction method pile column temporary concrete composite structure

Abstract

This invention discloses a construction method for a temporary concrete composite structure tower crane foundation using a reverse construction method for ultra-high-rise buildings. The method includes the following steps: Step 1: Constructing an integrated pile-column structure within the foundation pit according to the construction drawings to form several pile foundations; Step 2: Selecting three pile foundations outside the pre-installation location of the tower crane foundation as the main supports for the entire tower crane. A cushion layer is poured on the three pile foundations at the location of the natural ground. A structural beam formwork system is constructed on top of the three pile foundations. A support frame is constructed between the cushion layer and the structural beam formwork system to support the structural beam formwork system; Step 3: Constructing a positioning frame for the pre-installation of the tower crane foundation within the structural beam formwork system. The pre-embedded bolts of the tower crane foundation fixing platform are fixed within the positioning frame, and the structural beam formwork system is then poured with concrete; Step 4: Placing the tower crane foundation fixing platform on the positioning frame using a crane and fixing it with the pre-embedded bolts. This method addresses the challenges of site constraints, tower crane installation and dismantling, and economic efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of tower crane foundation construction methods, specifically relating to a construction method for a temporary concrete composite structure tower crane foundation using a reverse construction method for pile columns in ultra-high-rise buildings. Background Technology

[0002] In construction projects, tower cranes are commonly used and crucial transportation tools. Their installation and use require a safe and reliable vertical support foundation. According to the "Technical Specification for Safety of Installation, Use and Dismantling of Tower Cranes in Building Construction" (JGJ196-2010), common tower crane foundation types include slab concrete foundations, pile-cap reinforced concrete foundations, and composite foundations. With continuous innovation and advancements in modern construction technology, the country's requirements for green construction are becoming increasingly stringent, placing higher demands on installation costs, installation speed, and operational safety.

[0003] In some cases, due to the surrounding environment of certain projects, it is not possible to set up the tower crane outside the foundation pit, and the tower crane must be set up inside the foundation pit. Therefore, conventional tower crane foundations, such as natural slab foundations or natural beam foundations, cannot be used. Instead, lattice steel platform foundations, lattice concrete platform foundations, climbing foundations, permanent-temporary combined foundations, or permanent-temporary combined steel structure platforms can be considered.

[0004] However, these types of tower crane foundations are too expensive. Taking a 20,000-square-meter plot of land as an example, assuming that a combination of permanent and temporary steel structure platforms is used to set up the tower crane foundation, the steel structure platform requires 20 tons of steel, which costs about 200,000 yuan. The concrete structure platform requires about 50 cubic meters of concrete and 6 tons of steel bars, which costs about 80,000 yuan. This shows that there is a problem with high costs. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a construction method for a temporary concrete composite structure tower crane foundation using the reverse construction method for ultra-high-rise buildings, which can solve the problems of site constraints, tower crane installation and dismantling, and economy.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A construction method for a temporary concrete composite structure tower crane foundation using the reverse construction method for ultra-high-rise buildings includes the following steps:

[0008] Step 1: Construct several pile foundations by integrating pile and column construction within the foundation pit according to the construction drawings;

[0009] Step 2: Select three pile foundations outside the pre-installation position of the tower crane foundation as the main support of the tower crane as a whole. Pour a cushion layer on the three pile foundations at the position of the natural ground. Construct a structural beam formwork system on the top of the three pile foundations. Construct a support frame between the cushion layer and the structural beam formwork system to support the structural beam formwork system.

[0010] Step 3: Construct a positioning frame for the pre-installation of the tower crane foundation in the structural beam formwork system, fix the pre-embedded bolts of the tower crane foundation fixing platform in the positioning frame, and then pour concrete to build the structural beam formwork system.

[0011] Step 4: Use a crane to place the tower crane foundation fixing platform on the positioning frame, and then install and fix the tower crane foundation fixing platform using pre-embedded bolts.

[0012] Furthermore, in the second step, the elevation of the subbase is 6 meters, the thickness of the subbase is 100mm ± 5mm, and the elevation of the top surface of the structural beam formwork system is 10 meters.

[0013] Furthermore, in the second step, after pouring and constructing the cushion layer on the three pile foundations at the location of the natural ground, draw line marks on the projection position of the structural beam formwork system on the cushion layer, and draw a mark frame on the projection position of the positioning frame of the pre-installed foundation on the cushion layer. At the same time, draw the center position of the tower crane foundation and the installation position of the pre-embedded bolts of the tower crane foundation fixing platform within the mark frame.

[0014] Furthermore, in the second step, a structural beam formwork system is constructed on top of the three pile foundations using the following method:

[0015] Column caps are installed on the top of the three pile foundations, and then a structural beam formwork system is installed on the three column caps. The structural beam formwork system adopts a disc buckle support system. Several interconnected 48 steel pipes are tied between the tops of the three column caps with 48 steel bars according to the lines marked on the cushion layer to form the bottom surface of the disc buckle support system. Then, several U-shaped steel pipes are tied along the length of the lines marked on the bottom surface of the disc buckle support system to serve as the central support of the disc buckle support system. Finally, several connected 48 steel pipes are tied to the top surface of the U-shaped steel pipes with 48 steel bars to form the top surface of the disc buckle support system.

[0016] Furthermore, in the third step, the structural beam formwork system is used to construct a positioning frame for the pre-installation of the tower crane, and the pre-embedded bolts of the tower crane foundation fixing platform are fixed in the positioning frame, using the following method:

[0017] Based on the marked lines on the subbase, four frame plates are constructed on the top surface of the structural beam formwork system to form a positioning frame. Then, the installation positions of the pre-embedded bolts drawn on the subbase are connected to the bottom surface of the structural beam formwork system through the elevation lines. The verticality of the elevation lines is checked. Then, based on the connection position of the elevation lines in the structural beam system, the pre-embedded bolts of the tower crane foundation are fixed in the structural beam formwork system at the corresponding elevation line connection positions.

[0018] Furthermore, in the third step, after constructing the positioning frame for the pre-installation of the tower crane foundation in the structural beam formwork system and fixing the pre-embedded bolts of the tower crane foundation fixing platform in the positioning frame, the following method is also included:

[0019] Top plates, bottom plates, and side plates are constructed on the top, bottom, and sides of the structural beam formwork system using connecting ropes and connecting bars to surround the structural beam formwork system. The top plate needs to be machined with a frame-shaped opening to avoid gaps in the positioning frame. At the same time, an inner bottom plate needs to be set at the bottom of the positioning frame and cover the top surface of the pre-embedded bolts.

[0020] Furthermore, in the third step, before the concrete pouring of the structural beam formwork system, the following methods are also included:

[0021] Galvanized flat steel is pre-embedded in the structural beam formwork system, and round steel lightning protection down conductors are pre-embedded at the column corners of the pile foundation. Two pre-embedded bolts at opposite corners of the tower crane foundation fixing platform are connected to the galvanized flat steel through copper wires. The galvanized flat steel is then connected to the round steel lightning protection down conductors through copper wires, and finally the round steel lightning protection down conductors are guided to the steel pipe columns of the pile foundation.

[0022] The present invention has the following beneficial effects:

[0023] The construction of the temporary concrete composite structure tower crane foundation using the reverse construction method for ultra-high-rise buildings mainly follows the construction method of drawing measurement and layout → pile foundation construction → cushion layer construction → structural beam formwork system construction → construction positioning frame and installation of tower crane pre-embedded bolts → correction and fixing of pre-embedded bolts → concrete pouring, thereby realizing the construction of the tower crane foundation within the foundation pit. The pile foundation, constructed as an integrated pile and column structure, serves as the main support to suspend the tower crane foundation. By constructing a temporary structural beam formwork system on three pile foundations, only the concrete platform of the structural beam formwork system needs to be removed during the dismantling of the tower crane foundation, without dismantling the pile foundation structure used for subsequent floor construction. Furthermore, the dismantled structural beam formwork system contains a significant amount of recyclable steel reinforcement, and the concrete can be used for backfilling or reuse, greatly saving construction costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the pile foundation and cast-in-place structural beam formwork system of the present invention.

[0025] Figure 2 This is a top view schematic diagram of the structural beam formwork system of the present invention.

[0026] Figure 3 This is a plan view of the erection layout of the structural beam formwork system of the present invention.

[0027] Figure 4 This is a schematic diagram of the support frame between the cushion layer and the structural beam formwork system of the present invention.

[0028] Figure 5 This is a schematic diagram of the pre-embedded bolts installed in the restructured beam system of the present invention.

[0029] Figure 6 This is a schematic diagram of the positioning frame and pre-embedded bolts of the present invention.

[0030] In the diagram: 1. Pile foundation; 2. Column cap; 3. Structural beam formwork system; 4. Positioning frame; 5. Embedded bolts; 6. Subbase. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Terms such as “upper,” “inner,” “middle,” “left,” “right,” and “one” used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0032] A construction method for tower crane foundations using a reverse construction method with piles and columns for temporary concrete composite structures, such as... Figures 1 to 6 As shown, it includes the following steps:

[0033] Step 1: As Figures 1 to 2 As shown, pile-column integrated construction is carried out in the foundation pit according to the construction drawings to form several pile foundations 1.

[0034] In this embodiment, the pile foundation 1 project adopts bored cast-in-place piles. The diameters of the pile foundation 1 are φ1200, φ1400 and φ1800 rotary bored cast-in-place piles, and the bearing layer at the pile tip is moderately weathered or slightly weathered gravelly sandstone. During construction, a rotary drilling machine is first used to drill the hole, a crawler crane is used to hoist and place the steel cage, and then the pile core concrete is poured. Before the pile core concrete initially sets, the steel pipe column is inserted into the bored cast-in-place pile using the post-insertion method. Finally, the pile foundation 1 is formed by pouring concrete to form an integrated pile column.

[0035] Step 2: As Figures 1 to 4As shown, three pile foundations 1 are selected outside the pre-installation position of the tower crane foundation as the main support for the entire tower crane. A cushion layer 6 is poured and constructed on the three pile foundations 1 at the natural ground level. The cushion layer 6 extends approximately 100mm beyond the outer edge enclosed by the three pile foundations 1. The elevation of the cushion layer 6 is 6 meters, and the thickness of the cushion layer 6 is 100mm ± 5mm. Then, a structural beam formwork system 3 is constructed on top of the three pile foundations 1. The top surface of the structural beam formwork system 3 is at an elevation of 10 meters. A support frame is constructed between the cushion layer 6 and the structural beam formwork system 3 to support the structural beam formwork system 3.

[0036] In the second step, after pouring and constructing the cushion layer 6 on the three pile foundations 1 at the location of the natural ground, draw line marks on the cushion layer 6 to mark the projection position of the structural beam formwork system 3, so as to facilitate the construction of the structural beam formwork system 3 according to the line marks later; and draw the marking frame on the cushion layer 6 to mark the projection position of the positioning frame 4 of the pre-installed foundation, and draw the center position of the tower crane foundation and the installation position of the pre-embedded bolts 5 of the tower crane foundation fixing platform within the marking frame, so as to facilitate the construction of the positioning frame 4 and the installation and fixing of the pre-embedded bolts 5 later.

[0037] In the second step, a structural beam formwork system 3 is constructed on top of the three pile foundations 1 using the following method: Column caps 2 are installed on top of the three pile foundations 1, and then the structural beam formwork system 3 is installed on the three column caps 2. The structural beam formwork system 3 uses a disc-lock support system. Several interconnected 48mm steel pipes are tied between the tops of the three column caps 2 according to the lines marked on the cushion layer 6 to form the bottom surface of the disc-lock support system. Then, several U-shaped steel pipes are tied along the length of the lines marked on the bottom surface of the disc-lock support system to serve as the central support of the disc-lock support system. Finally, several connected 48mm steel pipes are tied to the top surfaces of the U-shaped steel pipes to form the top surface of the disc-lock support system. During this installation process, it is necessary to avoid the expected installation position of the pre-embedded bolts 5 of the tower crane foundation.

[0038] Step 3: As Figures 1 to 6 As shown, a positioning frame 4 for pre-installation of the tower crane foundation is constructed within the structural beam formwork system 3, and the pre-embedded bolts 5 of the tower crane foundation fixing platform are fixed within the positioning frame 4. During this process, based on the marked lines on the pad 6, four frame plates are constructed on the top surface of the structural beam formwork system 3 to enclose and form the positioning frame 4. This facilitates accurate location of the positioning frame 4 within the structural beam system and also facilitates subsequent installation and positioning of the tower crane foundation. Then, the installation positions of the pre-embedded bolts 5 marked on the pad 6 are tied to the bottom surface of the structural beam formwork system 3 using elevation lines. Simultaneously, the verticality of the elevation lines is checked. Based on the connection positions of the elevation lines within the structural beam system, the pre-embedded bolts 5 of the tower crane foundation are fixed within the structural beam formwork system 3 at the corresponding elevation line connection positions. The pre-embedded bolts 5 can be fixed by welding or steel reinforcement welding, which facilitates timely location of the pre-embedded bolts 5 of the tower crane foundation, thus improving installation efficiency.

[0039] Next, galvanized flat steel is pre-embedded within the structural beam formwork system 3, and φ12 round steel lightning protection down conductors are pre-embedded at the column corners of pile foundation 1. Two pre-embedded bolts 5 at opposite corners of the tower crane foundation fixing platform are connected to the galvanized flat steel via copper wires. The galvanized flat steel is then connected to the round steel lightning protection down conductors via copper wires, and finally, the round steel lightning protection down conductors are guided to the steel pipe column of pile foundation 1. The galvanized flat steel is 40mm*40mm in size and must not be directly or directly welded to the anchor bolts. The copper wires used as the connecting conductors have a grounding resistance of less than 4Ω. Thus, by connecting the two pre-embedded bolts 5 at opposite corners of the tower crane foundation fixing platform to the galvanized flat steel via copper wires, and finally connecting them to the steel pipe column of pile foundation 1, the effect of lightning protection grounding is achieved.

[0040] Next, the horizontal height difference and position of the positioning frame 4, as well as the horizontal height difference and position of the pre-embedded bolts 5, are further inspected. After the inspection is qualified, the following operations are performed: top plates, bottom plates and side plates are constructed on the top, bottom and all sides of the structural beam formwork system 3 through connecting ropes and connecting bars to surround the structural beam formwork system 3. The top plate needs to be made with a frame-shaped opening to avoid the positioning frame 4. At the same time, an inner bottom plate needs to be set at the bottom of the positioning frame 4 and cover the top surface of the pre-embedded bolts 5.

[0041] Finally, a concrete pouring system 3 for the structural beam formwork was constructed using a high-pressure pump, thus integrating the structural beam formwork system 3 and the pre-embedded bolts 5 into a single structure. The top slab, bottom slab, side slabs, and inner bottom slab are all made of wood for easy dismantling and reuse. After dismantling the top slab, bottom slab, inner bottom slab, and frame slabs, the top of the overall structure has a positioning frame 4 for positioning the tower crane foundation fixing platform. The positioning frame 4 also contains pre-embedded bolts 5 for installing the tower crane foundation fixing platform, facilitating subsequent installation and fixing of the tower crane foundation.

[0042] Step 4: Place the tower crane foundation fixing platform on the positioning frame 4 using a crane, and fix the tower crane foundation fixing platform by pre-embedded bolts 5, thereby completing the construction operation of the tower crane foundation of the temporary concrete composite structure of pile columns in the reverse construction method for super high-rise buildings.

[0043] In summary, the construction of the temporary concrete composite structure tower crane foundation using the reverse construction method for ultra-high-rise buildings is mainly carried out according to the following steps: drawing measurement and layout → pile foundation 1 construction → cushion layer 6 construction → structural beam formwork system 3 construction → construction positioning frame 4 and installation of tower crane pre-embedded bolts 5 → correction and fixing of pre-embedded bolts 5 → concrete pouring. This allows for the construction of the tower crane foundation within the foundation pit. The pile foundation 1, constructed as an integrated pile and column structure, serves as the main support, suspending the tower crane foundation. By constructing a temporary structural beam formwork system 3 on the three pile foundations 1, only the concrete platform of the structural beam formwork system 3 needs to be removed during the dismantling of the tower crane foundation, without dismantling the pile foundation 1 structure used for subsequent floor construction. Furthermore, the dismantled concrete structure of the structural beam formwork system 3 contains a significant amount of recyclable steel reinforcement, and the concrete can be used for backfilling or reuse, greatly reducing construction costs.

[0044] The embodiments of the present invention are not limited thereto. Based on the above description of the present invention, and using common technical knowledge and conventional means in the field, the present invention can be modified, replaced or combined in various other forms without departing from the basic technical idea of ​​the present invention, and all such modifications, replacements or combinations fall within the scope of protection of the present invention.

Claims

1. A construction method for a temporary concrete composite structure tower crane foundation using the reverse construction method for ultra-high-rise buildings, characterized in that, Includes the following steps: Step 1: Construct several pile foundations by integrating pile and column construction within the foundation pit according to the construction drawings; Step 2: Select three pile foundations outside the pre-installation position of the tower crane foundation as the main support of the tower crane as a whole. Pour a cushion layer on the three pile foundations at the position of the natural ground. Construct a structural beam formwork system on the top of the three pile foundations. Construct a support frame between the cushion layer and the structural beam formwork system to support the structural beam formwork system. Step 3: Construct a positioning frame for the pre-installation of the tower crane foundation in the structural beam formwork system, fix the pre-embedded bolts of the tower crane foundation fixing platform in the positioning frame, and then pour concrete to build the structural beam formwork system. Step 4: Use a crane to place the tower crane foundation fixing platform on the positioning frame, and then install and fix the tower crane foundation fixing platform using pre-embedded bolts.

2. The construction method for tower crane foundations of super high-rise buildings using the reverse construction method with pile columns and temporary concrete composite structures as described in claim 1, characterized in that, In the second step, the elevation of the subbase is 6 meters, the thickness of the subbase is 100mm ± 5mm, and the elevation of the top surface of the structural beam formwork system is 10 meters.

3. The construction method for tower crane foundations of super high-rise buildings using the reverse construction method with pile columns and temporary concrete composite structures as described in claim 1, characterized in that... In the second step, after pouring and constructing the cushion layer on the three pile foundations at the location of the natural ground, draw line marks on the projection position of the structural beam formwork system on the cushion layer, and draw a mark frame on the projection position of the positioning frame of the pre-installed foundation on the cushion layer. At the same time, draw the center position of the tower crane foundation and the installation position of the pre-embedded bolts of the tower crane foundation fixing platform within the mark frame.

4. The construction method for tower crane foundations of super high-rise buildings using the reverse construction method with pile columns and temporary concrete composite structures as described in claim 3, characterized in that... In the second step, a structural beam formwork system is constructed on top of the three pile foundations using the following method: Column caps are installed on the top of the three pile foundations, and then a structural beam formwork system is installed on the three column caps. The structural beam formwork system adopts a disc buckle support system. Several interconnected 48 steel pipes are tied between the tops of the three column caps with 48 steel bars according to the lines marked on the cushion layer to form the bottom surface of the disc buckle support system. Then, several U-shaped steel pipes are tied along the length of the lines marked on the bottom surface of the disc buckle support system to serve as the central support of the disc buckle support system. Finally, several connected 48 steel pipes are tied to the top surface of the U-shaped steel pipes with 48 steel bars to form the top surface of the disc buckle support system.

5. The construction method for tower crane foundations of super high-rise buildings using the reverse construction method with pile columns and temporary concrete composite structures as described in claim 4, characterized in that... In the third step, the structural beam formwork system is used to construct a positioning frame for the pre-installation of the tower crane. The pre-embedded bolts of the tower crane foundation fixing platform are fixed in the positioning frame using the following method: Based on the marked lines on the subbase, four frame plates are constructed on the top surface of the structural beam formwork system to form a positioning frame. Then, the installation positions of the pre-embedded bolts drawn on the subbase are connected to the bottom surface of the structural beam formwork system through the elevation lines. The verticality of the elevation lines is checked. Then, based on the connection position of the elevation lines in the structural beam system, the pre-embedded bolts of the tower crane foundation are fixed in the structural beam formwork system at the corresponding elevation line connection positions.

6. The construction method for tower crane foundations of super high-rise buildings using the reverse construction method with pile columns and temporary concrete composite structures as described in claim 4, characterized in that... In the third step, after constructing the positioning frame for the pre-installation of the tower crane foundation in the structural beam formwork system and fixing the pre-embedded bolts of the tower crane foundation fixing platform in the positioning frame, the following method is also included: Top plates, bottom plates, and side plates are constructed on the top, bottom, and sides of the structural beam formwork system using connecting ropes and connecting bars to surround the structural beam formwork system. The top plate needs to be machined with a frame-shaped opening to avoid gaps in the positioning frame. At the same time, an inner bottom plate needs to be set at the bottom of the positioning frame and cover the top surface of the pre-embedded bolts.

7. The construction method for tower crane foundations of super high-rise buildings using the reverse construction method with pile columns and temporary concrete composite structures as described in claim 1, characterized in that... In the third step, before the concrete pouring of the structural beam formwork system, the following methods are also included: Galvanized flat steel is pre-embedded in the structural beam formwork system, and round steel lightning protection down conductors are pre-embedded at the column corners of the pile foundation. Two pre-embedded bolts at opposite corners of the tower crane foundation fixing platform are connected to the galvanized flat steel through copper wires. The galvanized flat steel is then connected to the round steel lightning protection down conductors through copper wires, and finally the round steel lightning protection down conductors are guided to the steel pipe columns of the pile foundation.

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