Combined foundation structure of high tower crane

Abstract

The utility model discloses a combined foundation structure of a high tower crane, and relates to the technical field of building construction. Comprising more than two cast-in-place piles arranged at the bottom of a foundation pit, a steel framework column arranged on the cast-in-place piles, a tower crane bearing platform arranged on the steel framework column, a foundation pit supporting horizontal supporting structure, foundation pit supporting piles arranged on the peripheral wall of the foundation pit and a foundation pit waterproof curtain. The foundation pit supporting horizontal supporting structure is connected between the tower crane bearing platform and the foundation pit supporting pile. The utility model has the advantages that the safety and stability of the foundation structure in the whole construction process of the tower crane are met, and vertical diagonal bracings and horizontal diagonal bracings at the periphery of the outer side of the combined high pile cap foundation stand column can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of building technology, and in particular to a combined foundation structure for high tower cranes. Background Technology

[0002] In building construction, the foundations of commonly used tower cranes typically include slab foundations, pile foundations, concrete cap foundations, and composite foundations.

[0003] Among them, the composite foundation used in building construction (which can be a high-platform foundation support structure composed of concrete pile caps or steel platforms, lattice steel columns or steel pipe columns, steel scissor braces and cast-in-place piles or steel pipe piles, etc., and the support structure is generally from the top of the basement roof to the bottom of the basement floor structure) has the characteristics of fast construction speed and strong adaptability. However, because there are many connection parts in the composite foundation, improper handling of the connection parts or failure to install scissor braces in time can easily occur during construction, which will affect its overall stability and safety, especially under strong wind conditions.

[0004] Each type of tower crane foundation has its unique advantages and applicable conditions. However, in terms of safety, pile foundation concrete foundation (composed of a concrete cap and cast-in-place piles or precast piles) is more mature and safer and is widely used in the selection of tower crane foundations because it can effectively resist uneven settlement and lateral displacement of the foundation soil, effectively cope with various complex geological conditions and provide higher stability.

[0005] like Figure 9 As shown in Figure 10, in the construction of a tower crane combined high-pile foundation in the basement of a building, the construction of the vertical support structure (such as lattice steel columns + cast-in-place piles or steel pipe columns + cast-in-place piles, etc., with the lattice steel columns or steel pipe columns needing to penetrate the basement floor slab and vertically connect to the pile foundation) of the tower crane combined high-pile foundation (without horizontal constraints at the upper end and subject to lateral displacement during operation) is usually completed during the foundation pile construction stage. The construction of the concrete foundation or steel platform at the upper end of the combined foundation is completed before the large-scale excavation of the basement. Subsequently, the tower crane on the upper part of the foundation is installed and put into use ahead of schedule. As the large-scale layered excavation of the building foundation pit reaches the basement floor slab, it is necessary to promptly install corresponding vertical steel scissor braces and horizontal scissor braces around the outside of the steel columns, as well as reinforced and thickened concrete pads at the bottom of the pit, to ultimately form a complete combined high-pile foundation support structure to resist the torsional, overturning, vertical, and horizontal loads transmitted by the tower crane.

[0006] Therefore, it is evident that during the excavation of the foundation pit to the basement floor slab, the combined foundation structure of the tower crane (containing only the vertical support structure and the concrete cap or steel platform at the top of the combined foundation) is incomplete. At this stage, the overall stability of the combined foundation is poor. This is because the earthwork beneath the concrete cap or steel platform has not yet been excavated, failing to provide the necessary working surface for the vertical steel scissor bracing, horizontal scissor bracing, and the reinforced concrete cushion layer at the bottom of the pit. Consequently, the combined foundation's ability to resist horizontal and torsional forces is poor during the foundation pit excavation phase, affecting its overall stability and safety. Furthermore, due to the incompleteness of the combined foundation structure during the excavation phase, acceptance conditions are not met, making it impossible to implement the pre-acceptance and post-use construction procedure for the overall integrity of the combined foundation. Summary of the Invention

[0007] The purpose of this utility model is to provide a foundation structure for tower cranes that meets the safety and stability requirements of the entire construction process of tower cranes, and can eliminate the need for vertical and horizontal scissor bracing around the outer perimeter of the columns of the combined high-pile foundation.

[0008] The combined foundation structure for this utility model of a high tower crane is implemented as follows:

[0009] It includes two or more cast-in-place piles at the bottom of the foundation pit, steel structure columns on the cast-in-place piles, tower crane piers on the steel structure columns, horizontal support structure for foundation pit support, foundation pit support piles and foundation pit water-stop curtains on the perimeter of the foundation pit, and the horizontal support structure for foundation pit support is connected between the tower crane piers and the foundation pit support piles.

[0010] By combining the horizontal support structure of the foundation pit with the tower crane pier, the horizontal support structure of the foundation pit is used to resist the lateral displacement of the tower crane pier. This solves the problem that the upper end of the steel structure column is in a state of no horizontal restraint for a long time, and transforms the working condition of the tower crane pier into the working condition of a safe pile foundation type concrete foundation. This eliminates the need for vertical and horizontal scissor bracing around the outside of the columns of the combined high pile foundation. It also meets the requirement that the construction procedures and equipment, including the installation of the tower crane, can be put into use quickly after the overall acceptance of the combined high pile foundation is qualified before the earthwork excavation of the concrete pier of the tower crane combined high pile foundation. Furthermore, it provides the necessary conditions for the early closure of the openings on the basement level.

[0011] Preferably, a first vertical steel plate waterstop is installed on the steel frame column corresponding to the basement floor slab to facilitate the later construction of the basement floor slab.

[0012] Preferably, a closed steel cylinder is installed on the steel frame column at the location of the first vertical steel plate waterstop corresponding to the steel frame column. The upper cover plate is located above the basement floor slab, and the lower cover plate is located below the basement floor cushion layer to protect the first vertical steel plate waterstop and the interior of the steel frame column from soil contamination. After the surrounding soil is excavated, the steel cylinder is removed according to the working surface requirements, and the interior of the steel frame column and the first vertical steel plate waterstop are unfolded to connect with the basement floor slab.

[0013] Preferably, a partial basement wall panel with a second vertical steel plate waterstop and reserved basement wall panel reinforcement is provided on the horizontal support structure of the foundation pit corresponding to the basement wall panel, so as to facilitate the construction of the basement wall panel later.

[0014] Preferably, the tower crane platform is equipped with a horizontal steel plate waterstop and reserved basement panel reinforcement to facilitate the later construction of the basement panel.

[0015] Preferably, the concrete foundation surface is slightly higher than the basement panel structure to facilitate drainage of the equipment foundation, and the bottom is level with the horizontal support structure of the foundation pit.

[0016] The construction method of the combined foundation structure for high tower cranes of this utility model is implemented as follows, including:

[0017] S1: During the construction phase of engineering piles and foundation pit support structure piles, foundation pit support structure piles and foundation pit water-stop curtains are driven on the ground according to the special construction plan for foundation pit support. At the same time, cast-in-place piles of tower crane combined foundation are driven. After the concrete pouring of the cast-in-place piles is completed, steel frame columns with the first vertical steel plate water-stop and closed steel cylinder are inserted into the cast-in-place piles to ensure that the first vertical steel plate water-stop of the steel frame column is located at the basement panel position.

[0018] S2: When the concrete strength of the cast-in-place pile reaches the condition that the excavation can be carried out, the first layer of soil is excavated. The first layer of soil is excavated to the bottom of the horizontal support structure of the foundation pit. After leveling the soil, the horizontal support structure of the foundation pit and the tower crane platform with horizontal steel plate waterstop of the tower crane combined foundation are constructed.

[0019] S3: When the concrete cap of the tower crane's combined foundation reaches the strength required for tower crane installation, the tower crane is installed and the acceptance process is completed. When the strength of all the horizontal support structures of the foundation pit reaches the level required for excavation of the next layer of earthwork, the excavation of the soil under the horizontal support structure of the foundation pit continues, and the tower crane is put into use. At this time, the top of the tower crane's combined foundation is horizontally constrained by the horizontal support structure of the foundation pit, which means that the working condition of the combined high pile cap foundation is changed to the working condition of a safe pile cap concrete foundation, until the tower crane is dismantled.

[0020] S4: After the earthwork is excavated to the basement floor slab and the basement floor slab cushion layer is completed, the outer wall of the steel cylinder is cut off according to the working surface requirements, while the upper and lower cover plates are retained. The steel frame columns and the first vertical steel plate waterstop are unfolded until the cross-sectional requirements of the basement floor slab structure connection are met. Then the construction of the basement floor slab and basement wall panels is carried out.

[0021] S5: Cast the tower crane platform of the tower crane combined foundation together with the basement panel.

[0022] S6: Once the basement panel structure reaches its design strength, all steel frame columns will be removed to provide conditions for other professional construction operations in the basement section below the tower crane.

[0023] S7: After the tower crane is dismantled, remove the horizontal support structure of the foundation pit around the tower crane platform and the tower crane platform itself to ensure that all temporary structures used in construction are completely separated from the permanent structure of the building.

[0024] Preferably, during the construction of the horizontal support structure for the foundation pit in step S2, a partial basement wall panel with a second vertical steel plate waterstop and reserved basement wall panel reinforcement is installed on the horizontal support structure for the foundation pit. The construction of the basement wall panel is completed in step S4, so that the horizontal support structure for the foundation pit around the tower crane platform is connected to the vertical structure of the building, including the basement wall panel, and the connection between the foundation pit support piles and the vertical structure of the building is removed.

[0025] Preferably, during the construction of the basement negative n-level layer between steps S3 and S4, the basement negative n-level layer is directly poured together with the steel structure columns, where n = 1, 2, 3, ...

[0026] Compared with existing technologies, this utility model has the advantages of ensuring the safety and stability of the foundation structure throughout the entire construction process of tower cranes, and eliminating the need for vertical and horizontal scissor bracing around the outer perimeter of the columns of the combined high-pile foundation. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of the combined foundation structure for the high tower crane of this utility model;

[0028] Figure 2 for Figure 1 A magnified view of point A;

[0029] Figure 3 for Figure 1 A magnified view of point B;

[0030] Figure 4 for Figure 1 A magnified view of point C;

[0031] Figure 5 for Figure 2 DD section view;

[0032] Figure 6 Construction method for combined foundation structure of high tower crane Figure 1 ;

[0033] Figure 7 Construction method for combined foundation structure of high tower crane Figure 2 ;

[0034] Figure 8 for Figure 6 A magnified view of point F;

[0035] Figure 9 Construction methods for combined foundation structures of existing high tower cranes Figure 1 ;

[0036] Figure 10 Construction methods for combined foundation structures of existing high tower cranes Figure 2 .

[0037] Explanation of icon numbers:

[0038] 1-Foundation pit; 2-Cast-in pile; 3-Steel structure column; 4-Tower crane foundation; 5-Horizontal support structure for foundation pit; 6-Foundation pit support pile; 601-Cap beam; 7-Foundation pit water-stop curtain; 8-Basement floor slab; 9-First vertical steel plate waterstop; 10-Steel cylinder; 1001-Lower cover plate; 11-Basement floor slab cushion layer; 12-Basement wall panel; 13-Second vertical steel plate waterstop; 14-Basement wall panel reinforcement; 15-Partial basement wall panel; 16-Horizontal steel plate waterstop; 17-Reserved basement panel reinforcement; 18-Basement panel; 19-Engineering pile; 20-Soil; 21-Tower crane. Detailed Implementation

[0039] The combined foundation structure of the high tower crane of this utility model will now be described in further detail with reference to the accompanying drawings and embodiments:

[0040] like Figure 1 As shown in Figure 8, the combined foundation structure for the high tower crane of this utility model includes two or more cast-in-place piles 2 set at the bottom of the foundation pit 1, steel frame columns 3 (using lattice steel columns) set on the cast-in-place piles, a tower crane platform 4 set on the steel frame columns 3, a horizontal support structure 5 for foundation pit support, foundation pit support piles 6 with capping beams 601 set on the perimeter of the foundation pit 1, and a foundation pit water-stop curtain 7. The horizontal support structure 5 for foundation pit support is connected between the tower crane platform 4 and the foundation pit support piles 6.

[0041] Preferably, a first vertical steel plate waterstop 9 is provided on the steel frame column 3 at the location corresponding to the basement floor 8 to facilitate the later construction of the basement floor 8.

[0042] Preferably, a closed steel cylinder 10 is provided on the steel structure column 3 at the location corresponding to the first vertical steel plate waterstop 9 of the steel structure column 3. The upper cover plate is located on the upper part of the basement floor 8, and the lower cover plate 1001 is located on the lower part of the basement floor cushion layer 11, so as to protect the first vertical steel plate waterstop 9 and the interior of the steel structure column 3 from soil contamination. After the surrounding soil is excavated, the steel cylinder 10 is removed according to the needs of the working surface, and the interior of the steel structure column 3 and the first vertical steel plate waterstop 9 are unfolded so that they are connected to the basement floor 8.

[0043] Preferably, a partial basement wall panel 15 with a second vertical steel plate waterstop 13 and a reserved basement wall panel reinforcement 14 is provided on the horizontal support structure 5 of the foundation pit support at the location corresponding to the basement wall panel 12, so as to facilitate the construction of the basement wall panel 12 later.

[0044] Preferably, the tower crane platform 4 is provided with a horizontal steel plate waterstop 16 and a reserved basement panel reinforcement 17 on its side to facilitate the later construction of the basement panel.

[0045] Preferably, the top of the tower crane platform 4 is slightly higher than the basement panel 18 to facilitate drainage of the equipment foundation, and the bottom of the tower crane platform 4 is level with the horizontal support structure 5 of the foundation pit.

[0046] like Figure 6 As shown in Figure 8, the construction method of the combined foundation structure for the high tower crane of this utility model is implemented as follows, including:

[0047] S1: During the construction phase of engineering piles 19 and foundation pit support structure piles 6, foundation pit support structure piles 6 and foundation pit water-stop curtains 7 are driven on the ground according to the special construction plan for foundation pit support. At the same time, cast-in-place piles 2 of the tower crane combined foundation are driven. After the concrete pouring of cast-in-place piles 2 is completed, steel frame columns 3 with the first vertical steel plate water-stop 9 and the closed steel cylinder 10 are inserted into the cast-in-place piles 2 to ensure that the first vertical steel plate water-stop 9 of the steel frame column 3 is located at the basement panel 18.

[0048] S2: When the concrete strength of the cast-in-place pile 2 reaches the condition that the excavation of the soil can be carried out, the first layer of soil 20 is excavated. The first layer of soil 20 is excavated to the bottom of the horizontal support structure 5 of the foundation pit. After leveling the soil, the horizontal support structure 5 of the foundation pit and the tower crane platform 4 with horizontal steel plate waterstop 16 of the tower crane combined foundation are constructed.

[0049] S3: When the concrete cap of the tower crane combined foundation reaches the strength required for the installation of the tower crane 21, the installation of the tower crane 21 is completed and the acceptance procedure is completed. When the strength of all the foundation pit support horizontal support structures 5 reaches the condition for excavating the next layer of soil, the excavation of the soil 20 under the foundation pit support horizontal support structure 5 continues. At the same time, the tower crane 21 is put into use. At this time, the top of the tower crane combined foundation is horizontally constrained by the foundation pit support horizontal support structure 5, that is, the working condition of the combined high pile cap foundation is changed to the working condition of the safe pile cap concrete foundation, until the tower crane 21 is dismantled.

[0050] S4: After the earthwork is excavated to the basement floor slab and the basement floor slab cushion layer 11 is completed, the outer wall of the steel cylinder 10 is cut off according to the working surface requirements, while the upper cover plate and lower cover plate 1001 of the steel cylinder 10 are retained. The steel frame column 3 and the first vertical steel plate waterstop 9 are unfolded until the cross-sectional requirements of the structural connection of the basement floor slab 8 are met. Then the construction of the basement floor slab 8 and the basement wall panel 12 is carried out.

[0051] S5: Cast the tower crane platform 4 of the tower crane combined foundation together with the basement panel 18.

[0052] S6: Once the basement panel 18 structure reaches the design strength, all steel frame columns 3 will be removed to provide conditions for other professional construction operations in the basement section below the tower crane 21.

[0053] S7: After the tower crane 21 is dismantled, remove the foundation pit support horizontal support structure 5 and the tower crane platform 4 around the tower crane platform 4 to ensure that all temporary structures are completely separated from the permanent structure of the building.

[0054] Preferably, during the construction of the horizontal support structure 5 for the foundation pit in step S2, a partial basement wall panel 15 with a second vertical steel plate waterstop 13 and reserved basement wall panel reinforcement 14 is provided on the horizontal support structure 5. The construction of the basement wall panel 12 is completed in step S4, so that the horizontal support structure 5 for the foundation pit around the tower crane platform 4 is connected to the vertical structure of the building, including the basement wall panel 12. The connection between the foundation pit support pile 6 and the vertical structure of the building in the horizontal support structure 5 for the foundation pit is removed.

[0055] Preferably, during the construction of the basement's negative n-level layer between steps S3 and S4, the basement's negative n-level layer is directly poured together with the steel frame column 3, where n = 1, 2, 3, ... (e.g., ...). Figure 8 As shown, the basement level 1 is directly cast together with the steel frame column 3.

Claims

1. A high tower crane composite foundation structure, characterized in that, The base pit supporting horizontal support structure is connected between the tower crane support platform and the base pit supporting pile.

2. The high tower crane composite foundation structure according to claim 1, characterized in that, A first vertical steel plate water stop belt is arranged on the steel frame column corresponding to the basement floor position, so as to facilitate the construction of the basement floor in the later period.

3. The high tower crane composite foundation structure according to claim 2, characterized in that, A closed steel cylinder is arranged on the steel frame column corresponding to the first vertical steel plate water stop belt of the steel frame column, the upper cover plate of which is located on the upper part of the basement floor, and the lower cover plate is located on the lower part of the basement floor cushion.

4. A high tower crane composite foundation structure according to claim 1 or 2 or 3, characterized in that, A local basement wall plate with a second vertical steel plate water stop belt and reserved basement wall plate steel bars is arranged on the base pit supporting horizontal support structure corresponding to the basement wall plate.

5. The high tower crane composite foundation structure according to claim 1 or 2 or 3, characterized in that, A horizontal steel plate water stop belt and reserved basement panel steel bars are arranged on the side surface of the tower crane support platform.

6. The high tower crane composite foundation structure according to claim 5, characterized in that, The tower crane support platform is higher than the basement panel structure, facilitating equipment foundation drainage, and the bottom of the tower crane support platform is level with the base pit supporting horizontal support structure.

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