Attached tower crane for building renovation and method for installing same

Abstract

The application relates to the technical field of repairing, demolishing or other work of original buildings, and discloses an attached tower crane for building reconstruction and a mounting method thereof. A tower crane base is arranged on the core tube side facade of a built core tube steel structure building and is integrated with the floor steel beam of a non-top floor of the building, the tower body penetrates at least two floors upwards and extends to the roof outside, the tower crane base is a rigid square box, the floor steel beam is arranged at the bottom of the square box, the square box is fixedly connected with the core tube peripheral steel column through multiple plane trusses, and a reinforcing connecting rod connected with the internal steel column of the core tube is arranged at the connecting position of the core tube peripheral steel column and the top of the left and right sides of the truss box. In the application, the base of the tower crane is arranged on the high floor, then is connected with the core tube to increase the maximum lifting weight, the tower body is low and causes small damage to the building, and the cost is low. Meanwhile, the area needed to avoid under the lifting arm is small, and the tower body does not need to damage the elevator shaft, allowing the residents to normally live during the construction.

Description

Technical Field

[0001] This invention relates to the technical field of repair, demolition or other work on existing buildings, and in particular to an attached tower crane for building renovation and its installation method. Background Technology

[0002] Tower cranes are the primary lifting equipment used in the construction of high-rise buildings. As the name suggests, they have a tower-like structure with a boom mounted on it for lifting operations.

[0003] Tower cranes generally fall into two categories: external climbing tower cranes and internal climbing tower cranes. External climbing tower cranes are the most common type, installed outside the building, with the tower body composed of interconnected standard truss sections. Internal climbing tower cranes, on the other hand, are installed in elevator shafts or other similar shafts, climbing upwards within the modified shaft. They don't require a very tall tower, but the shaft must be compatible with the tower, and construction must be carried out around this shaft. In addition, there are "roof tower cranes," installed on rooftops. They have a very small allowable lifting capacity (limited by the roof's load-bearing capacity), and most building components cannot be lifted using roof tower cranes. However, roof tower cranes offer faster and more flexible installation, serving as a supplement to the two types mentioned above.

[0004] However, all of the above-mentioned tower cranes have limitations in their use for building renovation and construction:

[0005] First, the cost is too high:

[0006] Building renovation differs significantly from new construction, involving a much smaller workload, although the required tower crane height remains the same. Furthermore, since the building already has completed finishing touches such as interior decoration, elevator installation, and plumbing (water, electricity, heating) installation, both types of tower crane installation require damage to these existing components. Restoration is necessary after the building renovation, adding substantial additional costs. For example, external climbing tower cranes damage the building's exterior wall insulation, waterproofing, and decorative panels with their ties, and their concrete foundations require disruption of the surrounding ground level. Internal climbing tower cranes require the entire elevator shaft to be damaged during installation, necessitating the creation of large openings in the shaft to transport standard tower sections.

[0007] Secondly, it affects the use of the building:

[0008] External climbing tower cranes need to be located outside the building and avoid structures such as basements. Therefore, their booms are the longest of all types of tower cranes, and the area below the boom where people cannot move is also the largest. Residents in the building need to take a long detour to avoid these inaccessible areas during building renovations. As for internal climbing tower cranes, elevators cannot be used during installation, which is unacceptable for residents of high-rise buildings.

[0009] Finally, not all buildings can be renovated using these two common tower cranes:

[0010] For external climbing tower cranes, because they need to be connected to the building using wall ties, if there are outward-protruding structures on the upper floors of the building, this type of tower crane cannot be installed. For internal climbing tower cranes, the hoistway needs to be compatible with the tower body, and the building needs to be constructed around this hoistway. For a building that did not use internal climbing tower cranes during construction, the location and structure of its hoistway may not meet the requirements for their use.

[0011] The application of this invention addresses the aforementioned problems. The renovation work requires preserving as many original components as possible, making the process complex and time-consuming. Therefore, it's crucial to ensure the continued usability of unrenovated floors during the renovation process to avoid prolonged disruption to residents' daily lives. This precludes the use of internal climbing tower cranes. Initially, external climbing tower cranes were used, but their high cost proved prohibitive; adopting them for subsequent cranes would be prohibitively expensive. Summary of the Invention

[0012] This invention provides an attached tower crane for building renovation and its installation method.

[0013] The technical problem to be solved is that existing tower cranes are too expensive during building renovation, affect the use of the building, and not all buildings can use existing tower cranes during renovation.

[0014] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an attached tower crane for building renovation, comprising a tower crane base, a tower body set on the tower crane base, and a boom set on the tower body. The tower crane base is set on the side facade of the core tube of the existing core tube steel structure building and is integrated with the floor steel beams of the non-top floor of the building. The tower body extends upward through at least two floors and then extends to the outside of the roof.

[0015] The tower crane base is a rigid square box, and the floor steel beams pass through the bottom of the square box. The side elevation of the core tube where the tower crane base is located is called the tower crane installation surface. The four sides of the square box are set perpendicular to the tower crane installation surface and are called the extension connection surface. The extension connection surface extends to the tower crane installation surface and is fixedly connected to the outer peripheral steel column of the core tube at the position of the tower crane installation surface through a planar truss.

[0016] The connection points between the outer steel columns of the core tube and the top of the left and right sides of the truss box are called column tie nodes. The column tie nodes are also equipped with reinforcing connecting rods that connect to the steel columns inside the core tube.

[0017] Further, the tower crane base is a truss box enclosed by six planar trusses. Four planar trusses perpendicular to the tower crane installation surface extend towards the tower crane installation surface and are fixedly connected to the peripheral steel columns of the core tube at the tower crane installation surface position. The floor steel beams are arranged in the planar trusses at the bottom of the truss box and become the members in the planar trusses;

[0018] At least two in-box planar trusses for further enhancing the stiffness of the tower crane base are also arranged inside the truss box. The in-box planar trusses are arranged inside the truss box perpendicular to the tower crane installation surface.

[0019] Further, the tower body of the tower crane is connected to the tower crane base through a flange. The flange is arranged at the position of the edge of the truss box and above the in-box planar trusses.

[0020] Further, the floor steel beam is an I-shaped steel beam. At the connection position with the vertical members in the truss box, gusset plates for avoiding fracture at the connection position are arranged. The gusset plates are arranged on the left and right sides of the web, the plate surface is perpendicular to the I-shaped steel beam, and are respectively welded to the web and the upper and lower flange plates.

[0021] Further, the welds at the connection positions between the tower crane base and the peripheral steel columns of the core tube, the welds at the connection positions between the reinforcement connecting rods and the peripheral steel columns of the core tube, and the welds at the connection positions between the reinforcement connecting rods and the internal steel columns of the core tube are all vertical welds.

[0022] Further, the connection positions between the peripheral steel columns of the core tube and the internal steel columns of the core tube and each member all include two vertical welds located on the left and right sides of the end face of the member. The end of the member in the truss box increases the section to increase the spacing between the two vertical welds on the left and right. The reinforcement connecting rod increases the spacing between the two vertical welds on the left and right by using a lattice column structure; each reinforcement connecting rod is a lattice column enclosed by four angle steels, and there is no connection between the adjacent angle steels on the left and right.

[0023] Further, connecting rods are arranged at intervals on the tower body and are detachably fixedly connected to the peripheral steel columns of the core tube through the connecting rods.

[0024] Further, the tower body passes through the floor upwards along the floor hole on the floor. An additional steel beam for strengthening the truncated floor steel beam is arranged at the bottom of the floor steel beam truncated during the floor hole opening process. The additional steel beam is a T-shaped beam and is welded to the floor steel beam to form a steel beam with a cross-section in the shape of a "king"; a hole reinforcement steel beam is arranged around the bottom of the floor hole. The hole reinforcement steel beam is welded to the original floor steel beam at the intersection position.

[0025] An installation method for an attached tower crane for building renovation, used for constructing an attached tower crane for building renovation as described in claim 2, and includes the following steps:

[0026] Step 1: Drill holes in the floor slab where the tower crane base is located and remove the floor slab at the location of the tower crane base;

[0027] Step 2: Assemble the tower crane base;

[0028] Step 3: Cut a hole in the floor slab above the tower crane base for the tower crane to pass through;

[0029] Step 4: Install the tower body and crane boom.

[0030] Furthermore, the floor steel beams that interfere with the tower body are designated as steel beams to be cut off. The portion of the steel beams to be cut off that falls within the floor opening area of ​​step three is designated as the portion to be removed, and the remaining portion is designated as the portion to be retained. Step three is detailed as follows:

[0031] Step 3.1: Weld additional steel beams below the section to be retained for reinforcement;

[0032] Step 3.2: Reverse-push the end of the section to be retained that is closest to the floor opening;

[0033] Step 3.2: Remove the portion to be removed;

[0034] Step 3.2: Install reinforcing steel beams around the bottom of the floor opening and weld them to the existing floor steel beams at the intersection.

[0035] Compared with the prior art, the attached tower crane for building renovation and its installation method of the present invention have the following advantages:

[0036] In this invention, by setting the base of the tower crane on the floor slab near the top of the building and then connecting it to the core tube to increase the maximum lifting capacity, it is not necessary to set up a very tall tower body like an external climbing tower crane, nor is it necessary to damage the elevator shaft like an internal climbing tower crane. The damage to the building during the entire construction process is only a few holes in the floor slabs, which significantly reduces both material and labor costs.

[0037] In this invention, the tower crane's tower body is located in the middle of the building, the boom is short, and the area below the boom that needs to be avoided is small; at the same time, the tower crane does not affect the use of the elevator, nor does it affect the normal living and working of the residents.

[0038] In this invention, the installation of the tower crane is not affected by the protrusions on the exterior of the building, nor by the location and structure of the elevator shaft; it can be used as long as the building has a core tube.

[0039] In this invention, the tower crane base is located on the floor slab, and the floor slab can be used as a construction platform during the tower crane installation process; at the same time, the building's elevator is in normal operation, and construction materials can be transported by the elevator, thus making construction convenient. Attached Figure Description

[0040] Figure 1 This is a structural diagram of the tower crane base and reinforcing rods. The tower body and boom of the tower crane are the same as those of a conventional tower crane. For ease of reading, the tower body and boom are not drawn again, and the same applies below.

[0041] Figure 2 A schematic diagram showing the connection method between the tower crane base and reinforcing rods and the outer and inner steel columns of the core tube;

[0042] Figure 3 This is a schematic diagram of the tower crane base and reinforcing rods during use. To avoid obstruction, all walls and floors have been removed here.

[0043] In the diagram, 1-floor steel beam, 21-outer steel column of core tube, 22-inner steel column of core tube, 3-tower crane base, 31-rib plate, 32-inner plane truss of box, 33-flange, 4-reinforcing connecting rod. Detailed Implementation

[0044] like Figure 1-3 As shown, an attached tower crane for building renovation includes a tower crane base 3, a tower body set on the tower crane base 3, and a boom set on the tower body. The tower crane base 3 is set on the side facade of the core tube of the existing core tube steel structure building and is integrated with the floor steel beam 1 of the non-top floor of the building. The tower body extends upward through at least two floors and out to the roof.

[0045] The tower crane base 3 is a rigid square box. The floor steel beam 1 passes through the bottom of the square box. The side elevation of the core tube where the tower crane base 3 is located is called the tower crane installation surface. The four sides of the square box are set perpendicular to the tower crane installation surface and are called the extension connection surface. The extension connection surface extends to the tower crane installation surface and is fixedly connected to the outer peripheral steel column 21 of the core tube at the position of the tower crane installation surface through a planar truss.

[0046] Here, part of the load on the tower crane is borne by the floor steel beam 1, and the other part is borne by the core tube. If the cantilever structure is not stable enough, the load on the floor steel beam 1 will gradually increase during use. Therefore, multiple planar trusses are used to cantilever the tower crane base 3 to avoid this.

[0047] The floor steel beam 1 equipped with tower crane base 3 bears a greater load than when it is not equipped with tower crane base 3. Initially, we anticipated that the deflection of floor steel beam 1 would increase, potentially causing a hazard. However, calculations and actual construction results proved this view to be a technical bias. The deflection of floor steel beam 1 decreased after the installation of tower crane base 3, and even after subsequently breaking floor steel beam 1 with tower crane base 3, its deflection remained controllable.

[0048] Analysis revealed that the tower crane base 3 has high rigidity. The integration of the tower crane base 3 with the floor steel beam 1 further increases the rigidity of the floor steel beam 1, leading to the counterintuitive result described above. Therefore, the tower crane base 3 was constrained to be a rigid square box.

[0049] In this embodiment, the tower crane base 3 is a truss box formed by six planar trusses. Four planar trusses of the truss box, perpendicular to the tower crane mounting surface, extend toward the tower crane mounting surface and are fixedly connected to the outer steel column 21 of the core tube at the tower crane mounting surface. The floor steel beam 1 passes through the planar truss at the bottom of the truss box and becomes a member of the planar truss. At least two internal planar trusses 32 are also provided inside the truss box to further enhance the rigidity of the tower crane base 3. The internal planar trusses 32 are arranged inside the truss box perpendicular to the tower crane mounting surface.

[0050] The connection points between the outer steel columns 21 of the core tube and the top of the left and right sides of the truss box are called column tie nodes. The column tie nodes are also equipped with reinforcing connecting rods 4 that connect to the steel columns 22 inside the core tube.

[0051] It is dangerous to allow fewer columns to bear the horizontal load from the tower crane base 3. Therefore, a reinforcing link 4 is used here to allow more columns to participate in bearing the horizontal load.

[0052] The tower body of the tower crane is connected to the tower crane base 3 via flange 33. It is common practice to connect the four uprights in the tower body of the tower crane with flange 33. However, here it is necessary to set flange 33 at the position of the truss box edge and above the plane truss 32 inside the box, so that the most advantageous position for stress can bear the tower body.

[0053] The floor steel beam 1 is an I-beam. The I-beam is provided with ribs 31 at the connection position with the vertical members in the truss box to prevent the connection position from breaking. The ribs 31 are located on the left and right sides of the web, the plate surface is perpendicular to the I-beam, and they are welded to the web and the upper and lower flanges respectively.

[0054] The welds at the connection points of the tower crane base 3 and the outer steel column 21 of the core tube, the welds at the connection points of the reinforcing rod 4 and the outer steel column 21 of the core tube, and the welds at the connection points of the reinforcing rod 4 and the inner steel column 22 of the core tube are all vertical welds.

[0055] The reason why all the welds used here are vertical and horizontal welds are avoided is that there are vertical loads on the outer steel columns 21 of the core tube and the inner steel columns 22 of the core tube. If horizontal welds are used, the molten pool during the welding process will break these steel columns locally in a short time, which may cause the steel columns to bend or even overturn at the molten pool location.

[0056] The connection positions of the steel columns 21 on the outer periphery of the core tube and the steel columns 22 inside the core tube with each member all include two vertical welds located on the left and right sides of the end face of the member. The end of the member in the truss box increases the cross-section to increase the spacing between the two vertical welds on the left and right, and the reinforcement link 4 increases the spacing between the two vertical welds on the left and right by using a lattice column structure; each reinforcement link 4 is a lattice column formed by enclosing four angle steels, and there is no connection between the adjacent angle steels on the left and right.

[0057] The reason for increasing the spacing between the two vertical welds on the left and right here is that if the distance between these two welds is too close, the steel column will be locally subjected to a large tensile force, which may cause local yield / instability / failure. At the same time, during welding, the two vertical welds that are too close will have an effect similar to a transverse weld, which will temporarily interrupt the steel column and cause danger.

[0058] The reinforcement link 4 only needs to bear tensile force, and its role is equivalent to a stiffening cable. Using a lattice column is light in weight and convenient for installation. The four angle steels of the lattice column do not need to be all connected together. The two adjacent angle steels up and down are connected together to facilitate simultaneous welding, and the two on the left and right do not need to be connected together, and their distance can be widened to make the distance between the two vertical welds at the end farther. If a lattice column is used for the member in the truss box, it will affect the assembly of the truss box. Therefore, the cross-section of the end is increased to make the weld distance farther.

[0059] The tower body is provided with connecting rods at intervals and is detachably and fixedly connected to the steel columns 21 on the outer periphery of the core tube through the connecting rods. This is a conventional method for fixing the tower body and will not be elaborated here. Do not connect the tower body to the floor slab with a connecting rod, as the restraint effect will be poor and it may damage the floor slab.

[0060] The tower body passes through the floor slab upward along the floor hole on the floor slab. An additional steel beam for reinforcing the cut-off floor beam 1 is provided at the bottom of the floor beam 1 cut off during the process of opening the floor hole. The additional steel beam is a T-shaped beam and is welded to the floor beam 1 to form a steel beam with a cross-section in the shape of a "king". A hole reinforcing steel beam is provided around the bottom of the opening of the floor hole, and the hole reinforcing steel beam is welded to the original floor beam 1 at the intersection position.

[0061] Here, the tower body will inevitably interfere with a part of the floor beam 1 and needs to break these beams. After breaking, multiple aspects of reinforcement are required, including reinforcing the cut-off beams and setting a hole reinforcing steel beam around the opening. This is a standard practice and will not be elaborated here. However, it is worth mentioning that if the deflection of the floor beam 1 with the tower crane base 3 exceeds the standard in the calculation, a similar additional steel beam can also be used to reinforce it. However, since the floor beam 1 with the tower crane base 3 is not broken, the additional steel beam is a whole continuous steel beam when setting it.

[0062] An installation method for an attached tower crane used in building renovation, for constructing an attached tower crane for building renovation as described in claim 2, includes the following steps:

[0063] Step 1: Drill a hole in the floor slab where the tower crane base 3 is located and remove the floor slab at the location of the tower crane base 3;

[0064] Step 2: Assemble the tower crane base 3;

[0065] Step 3: Create a hole in the floor slab above the tower crane base 3 for the tower crane to pass through;

[0066] Step 4: Install the tower body and crane boom.

[0067] The floor steel beam 1 that interferes with the tower body is designated as the steel beam to be cut off. The portion of the steel beam to be cut off that is located within the floor opening in step three is designated as the portion to be removed, and the remaining portion is designated as the portion to be retained. Step three is as follows:

[0068] Step 3.1: Weld additional steel beams below the section to be retained for reinforcement;

[0069] Step 3.2: Reverse-push the end of the section to be retained that is closest to the floor opening;

[0070] Step 3.2: Remove the portion to be removed;

[0071] Step 3.2: Install reinforcing steel beams around the bottom of the floor opening and weld them to the existing floor steel beam 1 at the intersection.

[0072] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An attached tower crane for building renovation, comprising a tower crane base (3), a tower body mounted on the tower crane base (3), and a boom mounted on the tower body, characterized in that: The tower crane base (3) is set on the side facade of the core tube of the completed core tube steel structure building and is integrated with the floor steel beam (1) of the non-top floor of the building. The tower body extends upward through at least two floors and then extends to the outside of the roof. The tower crane base (3) is a rigid square box. The floor steel beam (1) passes through the bottom of the square box. The side elevation of the core tube where the tower crane base (3) is located is called the tower crane installation surface. The four sides of the square box are set perpendicular to the tower crane installation surface and are called the extension connection surface. The extension connection surface extends to the tower crane installation surface and is fixedly connected to the outer peripheral steel column (21) of the core tube at the position of the tower crane installation surface through a planar truss. The connection position between the outer steel column (21) of the core tube and the top of the left and right sides of the truss box is called the column tie node. The column tie node is also provided with a reinforcing connecting rod (4) that connects to the steel column (22) inside the core tube. The tower crane base (3) is a truss box formed by six planar trusses. The four planar trusses of the truss box, which are perpendicular to the tower crane installation surface, extend toward the tower crane installation surface and are fixedly connected to the outer steel column (21) of the core tube at the tower crane installation surface. The floor steel beam (1) passes through the planar truss at the bottom of the truss box and becomes a member in the planar truss. The truss box is also provided with at least two in-box planar trusses (32) for further enhancing the rigidity of the tower crane base (3). The in-box planar trusses (32) are arranged inside the truss box perpendicular to the tower crane mounting surface. Here, part of the load on the tower crane is borne by the floor steel beam (1), and the other part is borne by the core tube. If the cantilever structure is not stable enough, the load on the floor steel beam (1) will gradually increase during use. Therefore, multiple planar trusses are used to cantilever the tower crane base (3) to avoid this.

2. The attached tower crane for building renovation according to claim 1, characterized in that: The tower body of the tower crane is connected to the tower crane base (3) via a flange (33), which is located at the edge of the truss box and above the plane truss (32) inside the box.

3. The attached tower crane for building renovation according to claim 1, characterized in that: The floor steel beam (1) is an I-beam. The I-beam is provided with ribs (31) at the connection position with the vertical members in the truss box to prevent the connection position from breaking. The ribs (31) are located on the left and right sides of the web, with the plate surface perpendicular to the I-beam, and are welded to the web and the upper and lower flanges respectively.

4. The attached tower crane for building renovation according to claim 1, characterized in that: The welds at the connection points of the tower crane base (3) and the outer steel column (21) of the core tube, the welds at the connection points of the reinforcing rod (4) and the outer steel column (21) of the core tube, and the welds at the connection points of the reinforcing rod (4) and the inner steel column (22) of the core tube are all vertical welds.

5. An attached tower crane for building renovation according to claim 4, characterized in that: The connection points of the outer perimeter steel column (21) and the inner steel column (22) of the core tube with each member include two vertical welds on the left and right sides of the member end face. The members in the truss box increase the spacing between the two vertical welds by increasing the cross section. The reinforcing link (4) increases the spacing between the two vertical welds by using a lattice column structure. Each reinforcing link (4) is a lattice column formed by four angle steels, and there is no connection between the adjacent angle steels on the left and right sides.

6. An attached tower crane for building renovation according to claim 1, characterized in that: The tower body is provided with connecting wall rods at intervals, and is detachably and fixedly connected to the steel columns (21) on the outer periphery of the core tube through the connecting wall rods.

7. An attached tower crane for building renovation according to claim 1, characterized in that: The tower body passes through the floor along the floor hole on the floor. An additional steel beam for strengthening the truncated floor beam (1) is provided at the bottom of the floor beam (1) truncated during the process of opening the floor hole. The additional steel beam is a T-shaped beam and is welded to the floor beam (1) to form a steel beam with a "king" - shaped cross-section; a hole - strengthening steel beam is provided around the bottom of the opening of the floor hole, and the hole - strengthening steel beam is welded to the original floor beam (1) at the intersection position.

8. An installation method for an attached tower crane used in building renovation, characterized in that: A method for constructing an attached tower crane for building renovation as claimed in claim 1, and comprises the following steps: Step 1: Drill a hole in the floor where the tower crane base (3) is located, and remove the floor at the position of the tower crane base (3). Step 2: Assemble the tower crane base (3) completely. Step 3: Open a floor hole on the floor above the tower crane base (3) for the tower body to pass through. Step 4: Install the tower body and the jib.

9. The installation method of an attached tower crane for building renovation according to claim 8, characterized in that: The floor beam (1) interfering with the tower body is denoted as the to - be - truncated steel beam. The part of the to - be - truncated steel beam within the range of the floor hole in Step 3 is denoted as the to - be - removed part, and the rest is denoted as the to - be - retained part. Step 3 is specifically as follows: Step 3.1: Weld an additional steel beam below the to - be - retained part for reinforcement. Step 3.2: Jack the end of the to - be - retained part close to the floor hole. Step 3.2: Cut off the to - be - removed part. Step 3.2: Install a hole - strengthening steel beam around the bottom of the opening of the floor hole, and weld it to the original floor beam (1) at the intersection position.

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