A tower crane foundation and construction method thereof

Abstract

The present invention discloses a tower crane foundation and a construction method thereof, which relates to the technical field of building construction, and comprises four square piles, an upper cap and a lower cap, wherein the four square piles are arranged at four corners, and the outer side of each square pile is sleeved with a lattice column, and the upper cap is arranged at the upper end of each square pile and the upper end of each lattice column, and the upper cap is used to connect with the tower crane, and the lower end of each square pile and the lower end of each lattice column pass through the lower cap and extend into the bottom of the pit, and the lattice columns are connected by a shear brace system. The present invention is not only applicable to soft soil areas, but also can effectively avoid the problems caused by the construction of tower crane high pile foundation, which not only effectively guarantees the pile quality of the tower crane foundation pile, but also can effectively avoid the influence of the prior excavation, which is beneficial to the construction traffic organization and the general layout in the site.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a tower crane foundation and a construction method thereof. Background Art

[0002] In the engineering field, tower cranes play an important role in vertical transportation during construction. In order to facilitate construction and put them into use in a timely manner, tower cranes are excavated and constructed first. If the traditional tower crane foundation is lowered below the bottom plate, in areas of deep plastic saturated soft soil, the excavation of the tower crane foundation in the basement will easily cause construction difficulties and landslides on the site, and easily cause the engineering piles to tilt or cause damage to the engineering piles. Summary of the invention

[0003] The purpose of the present invention is to provide a tower crane foundation and a construction method thereof to solve the problems existing in the above-mentioned prior art, which can not only effectively ensure the pile quality of the tower crane foundation piles, but also effectively avoid the influence of prior excavation.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a tower crane foundation, comprising four square piles, an upper cap and a lower cap, wherein the four square piles are arranged at four corners, a lattice column is sleeved on the outer side of each square pile, the upper cap is arranged at the upper end of each square pile and the upper end of each lattice column, the upper cap is used to be connected with the tower crane, the lower end of each square pile and the lower end of each lattice column pass through the lower cap and extend into the bottom of a pit, and the lattice columns are connected by a shear brace system.

[0006] Preferably, the square pile comprises a steel cage, the steel cage is surrounded by a rectangular parallelepiped structure, the joints of the steel cage are connected by a plurality of stirrups, and concrete is poured in the steel cage.

[0007] Preferably, the lattice column includes four angle steels and a plurality of tie plates, each of the angle steels is located at each corner of the steel cage, each of the tie plates is evenly distributed on each side of the square pile along the length direction of the square pile, and each of the tie plates is connected to two adjacent angle steels.

[0008] Preferably, the length of the square piles extending into the pit bottom is greater than the length of the angle steels extending into the pit bottom, and the shear bracing system is located above the pit bottom.

[0009] Preferably, a water-stop structure is provided between the angle steel and the basement top plate or basement bottom plate.

[0010] Preferably, the shear brace system includes a plurality of shear brace structures, each of the shear brace structures includes three horizontal shear brace structures and two vertical shear brace structures, the three horizontal shear brace structures are arranged in sequence from top to bottom, and each vertical shear brace structure is arranged between two horizontal shear brace structures.

[0011] Preferably, each of the horizontal shear brace structures includes four first horizontal shear braces and two second horizontal shear braces, and the four first horizontal shear braces and the two second horizontal shear braces are all located in the same horizontal plane, one end of each of the first horizontal shear braces is connected to a lattice column, the other end of each of the first horizontal shear braces is connected to another adjacent lattice column on the same side, and both ends of each of the second horizontal shear braces are respectively connected to two diagonally arranged lattice columns.

[0012] Preferably, each of the facade shear brace structures includes four facade shear braces, each of the facade shear braces is arranged obliquely, one end of the same facade shear brace is connected to a lattice column, and the other end of the same facade shear brace is connected to an adjacent lattice column, and the four facade shear braces of the same facade shear brace structure are sequentially arranged in a broken line shape, and the adjacent facade shear braces located on the same side are arranged in a broken line shape.

[0013] Preferably, the upper support is located above the basement roof, and a pre-buried tower crane bracket is provided in the upper support, and the pre-buried tower crane bracket is used to be connected to the tower crane; the upper surface of the lower support is in contact with the lower surface of the basement floor.

[0014] The present invention also provides a construction method of the tower crane foundation, comprising the following steps:

[0015] S1: Determine the center distance between adjacent square piles according to the model of the tower crane;

[0016] S2: prefabricate the square piles;

[0017] S3: transporting the prefabricated square piles to the site for pile sinking;

[0018] S4: constructing an upper bearing platform at the upper end of each of the square piles and setting up a tower crane;

[0019] S5: As the basement soil is excavated layer by layer, the shear support system is set up layer by layer;

[0020] S6: After excavating to the bottom of the pit, carry out the construction of the lower pedestal to form the tower crane foundation.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The present invention is not only suitable for soft soil areas, but also can effectively avoid the problems caused by the construction of tower crane high pile foundations. It can effectively ensure the pile quality of the tower crane foundation piles, and can effectively avoid the influence of prior excavation, which is beneficial to the construction traffic organization and general layout within the site. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the tower crane foundation of the present invention;

[0025] Figure 2 It is a schematic diagram of the position of the square piles of the present invention;

[0026] Figure 3 It is a schematic diagram of the construction of the upper platform of the present invention;

[0027] Figure 4 It is a schematic diagram of the upper platform structure of the present invention;

[0028] Figure 5 It is a schematic cross-sectional view of a square pile of the present invention;

[0029] Figure 6 is a schematic diagram of a lattice column of the present invention;

[0030] Figure 7 is a schematic cross-sectional view of a lattice column of the present invention;

[0031] Figure 8 It is a schematic cross-sectional view of a square pile and a lattice column of the present invention;

[0032] Fig. 9 It is a schematic diagram of the square pile, lattice column and water-stop structure of the present invention;

[0033] Fig.10 A schematic diagram of the shear bracing system of the present invention;

[0034] Fig.11 It is a schematic diagram of the shear bracing system of the present invention;

[0035] Fig.12 It is a schematic diagram of the horizontal shear brace structure of the present invention;

[0036] Fig.13 for Fig.11 A schematic diagram of the structure at I in the direction of A;

[0037] Fig.14 for Fig.11 Ⅱ B direction and Fig.12 Schematic diagram of the C-direction structure at position III;

[0038] Fig.15 for Fig.12 Schematic diagram of the D-direction structure at IV;

[0039] Among them: 100-tower crane foundation, 1-square pile, 2-upper pedestal, 3-lower pedestal, 4-lattice column, 5-reinforcement cage, 6-angle steel, 7-hoops, 8-stitched plate, 9-waterstop structure, 10-horizontal shear brace structure, 11-vertical shear brace structure, 12-first horizontal shear brace, 13-second horizontal shear brace, 14-vertical shear brace, 15-basement top plate, 16-basement bottom plate, 17-pad, 18-anchor structure, 19-double-layer bidirectional steel bars. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The purpose of the present invention is to provide a tower crane foundation and a construction method thereof to solve the problems existing in the above-mentioned prior art, which can not only effectively ensure the pile quality of the tower crane foundation piles, but also effectively avoid the influence of prior excavation.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Embodiment 1

[0044] like Figure 1-Figure 15 As shown: This embodiment provides a tower crane foundation 100, including four square piles 1, an upper pedestal 2 and a lower pedestal 3. The four square piles 1 are arranged at four corners, that is, the four square piles 1 are located at the four corners of a rectangle. Lattice columns 4 are sleeved on the outside of each square pile 1. The upper pedestal 2 is arranged at the upper end of each square pile 1 and the upper end of each lattice column 4. The upper pedestal 2 is used to connect with the tower crane. The lower end of each square pile 1 and the lower end of each lattice column 4 pass through the lower pedestal 3 and extend into the bottom of the pit. The lattice columns 4 are connected by a shear brace system.

[0045] Specifically, in this embodiment, the square pile 1 includes a steel cage 5, which is surrounded by a rectangular structure. The joints of the steel cage 5 are connected by a plurality of stirrups 7. Concrete is poured in the steel cage 5. The stirrups 7 correspond to the positions of an angle steel 6 of the lattice column 4. Each stirrup 7 is fully welded to the corresponding angle steel 6 by a fillet weld. The weld leg size is the diameter of the stirrup 7 minus 2 mm, and the weld grade is not lower than level 2.

[0046] In this embodiment, the lattice column 4 includes four angle steels 6 and a plurality of gusset plates 8. The size of the angle steel 6 is 140 mm × 12 mm, and the size of the gusset plates 8 is 380 mm × 300 mm × 12 mm. Each angle steel 6 is located at each corner of the steel cage 5. Each gusset plate 8 is evenly distributed on each side of the square pile 1 along the length direction of the square pile 1. Each gusset plate 8 is connected to two adjacent angle steels 6.

[0047] In this embodiment, the length of the square pile 1 extending into the pit bottom is greater than the length of the angle steel 6 extending into the pit bottom. The angle steel 6 extends 3m below the pit bottom. The shear support system is located above the pit bottom. Specifically, the lowest shear support structure is located above the pit bottom.

[0048] In this embodiment, a water stop structure 9 is welded between the angle steel 6 and the basement top plate 15 or the basement bottom plate 16 .

[0049] In this embodiment, the shear brace system includes a plurality of shear brace structures, each of which includes three horizontal shear brace structures 10 and two vertical shear brace structures 11. The three horizontal shear brace structures 10 are arranged in sequence from top to bottom, and each vertical shear brace structure 11 is arranged between the two horizontal shear brace structures 10.

[0050] In the present embodiment, each horizontal shear strut structure 10 includes four first horizontal shear struts 12 and two second horizontal shear struts 13. The four first horizontal shear struts 12 are parallel to each other. The four first horizontal shear struts 12 and the four lattice columns 4 form a rectangular structure. The four first horizontal shear struts 12 and the two second horizontal shear struts 13 are generally located in the same horizontal plane. The height of one second horizontal shear strut 13 is slightly higher than the height of another second horizontal shear strut 13. One end of each first horizontal shear strut 12 is connected to a lattice column 4, and the other end of each first horizontal shear strut 12 is connected to another adjacent lattice column 4 on the same side. The two ends of each second horizontal shear strut 13 are respectively connected to two lattice columns 4 arranged diagonally. The four first horizontal shear struts 12 and the two second horizontal shear struts 13 in the same horizontal shear strut structure 10 are respectively connected to the supporting plate 8 and the angle steel 6 located at the same height segment.

[0051] In this embodiment, each facade shear brace structure 11 includes four facade shear braces 14, each facade shear brace 14 is arranged at an angle, one end of the same facade shear brace 14 is connected to a lattice column 4, and the other end of the same facade shear brace 14 is connected to an adjacent lattice column 4. The four facade shear braces 14 of the same facade shear brace structure 11 are arranged in a broken line shape in sequence, and the adjacent facade shear braces 14 located on the same side are arranged in a broken line shape. The upper ends of the facade shear braces 14 of the facade shear brace structure 11 of the upper layer are approximately located at the same horizontal plane as the horizontal shear brace structure 10 above them, the lower ends of the facade shear brace structures 14 of the upper layer and the upper ends of the facade shear brace structures 14 of the facade shear brace structure 11 of the lower layer are approximately located at the same horizontal plane as the horizontal shear brace structure 10 between the two layers of facade shear brace structures 11, and the lower ends of the facade shear brace structures 14 of the facade shear brace structure 11 of the lower layer are approximately located at the same horizontal plane as the horizontal shear brace structure 10 below them.

[0052] In this embodiment, the first horizontal shear brace 12, the second horizontal shear brace 13 and the vertical shear brace 14 are all made of channel steel, and the two ends of the first horizontal shear brace 12, the two ends of the second horizontal shear brace 13 and the two ends of the vertical shear brace 14 are respectively connected to the angle steel 6 by fillet welds.

[0053] When it is a multi-story basement, such as Fig.10 As shown, the facade shear braces 14 should all form a closed independent system within the layer. In the construction of multi-layer basements, the basement floor 16 of each middle layer is the basement top 15 of the next layer.

[0054] In this embodiment, the upper pedestal 2 and the lower pedestal 3 are both made of double-layer bidirectional steel bars 19 and poured with concrete. A cushion layer 17 is provided at the bottom of the upper pedestal 2. The upper pedestal 2 is located above the basement roof 15, which is convenient for later demolition construction and greatly facilitates the later demolition of the upper pedestal 2. The upper pedestal 2 is at least 600mm higher than the basement roof 15, which is convenient for later demolition construction. A pre-buried tower crane bracket is provided in the upper pedestal 2, and the pre-buried tower crane bracket is used to connect with the tower crane. The pre-buried tower crane bracket includes an anchoring structure 18. The length of the anchoring structure 18 is less than the thickness of the upper pedestal 2. The anchoring structure 18 is an angle steel. The angle steel in the upper pedestal 2 and the end plate of the square pile 1 are connected by full welding on both sides of the fillet weld. The weld leg size is the thickness of the angle steel plate in the upper pedestal 2 minus 2mm, and the cutting length is greater than or equal to 900mm; the upper surface of the lower pedestal 3 is in contact with the lower surface of the basement floor 16, and the thickness of the lower pedestal 3 is 300mm.

[0055] This embodiment is not only applicable to soft soil areas, but can also effectively avoid the problems caused by the construction of tower crane high pile foundations.

[0056] Embodiment 2

[0057] This embodiment provides a construction method of a tower crane foundation 100 according to Embodiment 1, comprising the following steps:

[0058] S1: Determine the center distance between adjacent square piles 1 according to tower cranes of different manufacturers and models. When determining the center distance, calculate it according to the most unfavorable operating load of the tower crane;

[0059] S2: Prefabricate square pile 1, tie steel cage 5, connect with stirrup 7 at the joint of steel cage 5, weld angle steel 6, stirrup 7 and angle steel 6 are fully welded on both sides, weld angle steel 6 at each corner of square pile 1, angle steel 6 is angle steel 6 of lattice column 4, then pour pile body concrete, maintain and remove formwork, weld gusset plate 8 on each side of square pile 1;

[0060] S3: transport the prefabricated square pile 1 to the site, study the stratum distribution of the geological survey before sinking the pile, ensure the pile elevation, and then use hammering or static pressure to sink the pile;

[0061] S4: construct the upper platform 2 at the upper end of each pile 1, and erect the tower crane after the maintenance meets the requirements;

[0062] S5: As the basement earthwork is excavated layer by layer, the horizontal shear support structure 10 and the vertical shear support structure 11 are set up layer by layer;

[0063] S6: After excavating to the bottom of the pit, the lower cap 3 is constructed to form a tower crane foundation 100.

[0064] The square piles 1 of this embodiment are prefabricated in the factory, and hammering or static pressure pile sinking construction is carried out on site, which effectively shortens the maintenance period and ensures the quality of the pile body; the upper bearing platform 2 is cast at the natural ground elevation in the site to avoid the adverse effects of prior excavation and construction on the main project piles and the site, which is beneficial to the construction traffic organization and general layout in the site; compared with the design concept of lowering the traditional tower crane foundation to below the bottom of the base plate, this embodiment can effectively avoid the safety hazards of prior excavation and prior review of dangerous and major projects, effectively speed up the construction progress and reduce the cost of related dangerous and major projects; the basement floor 16 and the basement roof 15 are cast at one time, which effectively avoids the secondary entry caused by leaving a hole for the second time, and the water-stop structure 9 reduces the risk of water seepage.

[0065] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A construction method for a tower crane foundation, characterized in that: The tower crane foundation includes four square piles, an upper cap and a lower cap. The four square piles are arranged at four corners. A lattice column is sleeved on the outside of each square pile. The upper cap is arranged at the upper end of each square pile and the upper end of each lattice column. The upper cap is used to connect with the tower crane. The lower end of each square pile and the lower end of each lattice column pass through the lower cap and extend into the bottom of the pit. The lattice columns are connected by a shear brace system. The square pile includes a steel cage, which is surrounded by a rectangular parallelepiped structure, the joints of the steel cage are connected by a plurality of stirrups, and concrete is poured in the steel cage; The lattice column includes four angle steels and a plurality of gussets, each of the angle steels is located at each corner of the steel cage, the angle steels are welded to the steel cage, each of the gussets is evenly distributed on each side of the square pile along the length direction of the square pile, and each of the gussets is connected to two adjacent angle steels; The length of the square pile extending into the pit bottom is greater than the length of the angle steel extending into the pit bottom; The construction method includes the following steps: S1: Determine the center distance between adjacent square piles according to the model of the tower crane; S2: Prefabricate the square piles, tie the steel cages, connect the steel cages with stirrups, weld angle steels, fully weld the stirrups and angle steels on both sides, weld angle steels at each corner of the square piles, the angle steels are angle steels of lattice columns, then pour the pile body concrete, maintain and remove the formwork, and weld gussets on each side of the square piles; S3: transporting the prefabricated square piles to the site for pile sinking; S4: constructing an upper bearing platform at the upper end of each of the square piles and setting up a tower crane; S5: As the basement soil is excavated layer by layer, the shear support system is set up layer by layer; S6: After excavating to the bottom of the pit, carry out the construction of the lower pedestal to form the tower crane foundation.

2. The construction method of the tower crane foundation according to claim 1, characterized in that: The shear brace system is located above the pit bottom.

3. The construction method of the tower crane foundation according to claim 1, characterized in that: A water-stop structure is arranged between the angle steel and the basement top plate or the basement bottom plate.

4. The construction method of the tower crane foundation according to claim 1, characterized in that: The shear brace system includes a plurality of shear brace structures, each of which includes three horizontal shear brace structures and two vertical shear brace structures. The three horizontal shear brace structures are arranged in sequence from top to bottom, and each vertical shear brace structure is arranged between two horizontal shear brace structures.

5. The construction method of the tower crane foundation according to claim 4, characterized in that: Each of the horizontal shear brace structures includes four first horizontal shear braces and two second horizontal shear braces. The four first horizontal shear braces and the two second horizontal shear braces are all located in the same horizontal plane. One end of each of the first horizontal shear braces is connected to a lattice column, and the other end of each of the first horizontal shear braces is connected to another adjacent lattice column on the same side. Both ends of each of the second horizontal shear braces are respectively connected to two diagonally arranged lattice columns.

6. The construction method of the tower crane foundation according to claim 4, characterized in that: Each of the facade shear brace structures includes four facade shear braces, each of the facade shear braces is arranged obliquely, one end of the same facade shear brace is connected to a lattice column, and the other end of the same facade shear brace is connected to an adjacent lattice column. The four facade shear braces of the same facade shear brace structure are sequentially arranged in a broken line shape, and the adjacent facade shear braces located on the same side are arranged in a broken line shape.

7. The construction method of tower crane foundation according to claim 1, characterized in that: The upper bearing platform is located above the basement roof, and a pre-buried tower crane bracket is arranged in the upper bearing platform, and the pre-buried tower crane bracket is used to be connected to the tower crane; the upper surface of the lower bearing platform contacts the lower surface of the basement floor.

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