Tower crane foundation structure in wide foundation pit

Abstract

The utility model discloses a tower crane foundation structure in a wide and large foundation pit, which comprises a tower crane foundation positioned at the central position of the foundation pit; the peripheral bottom plate is arranged on the periphery of the tower crane foundation in a surrounding manner and is used for enhancing the strength of the tower crane foundation; the tower crane foundation comprises upper-layer reinforcing steel bars, lower-layer reinforcing steel bars and lower-layer reinforcing steel bars, the middle-layer reinforcing steel bars are arranged below the upper-layer reinforcing steel bars; the lower-layer reinforcing steel bars are arranged below the middle-layer reinforcing steel bars; and the vertical tie bars are arranged between the upper-layer steel bars and the middle-layer steel bars at certain intervals and between the middle-layer steel bars and the lower-layer steel bars at certain intervals, and are used for connecting and reinforcing the steel bars of different layers. The utility model can solve the problems that the construction is complicated, the safety is poor, the tower crane plays a role later, the secondary construction is needed in the later period and the like in the tower crane infrastructure construction.

Description

Technical Field

[0001] The utility model relates to the field of tower crane foundation construction, in particular to a tower crane foundation structure in a wide foundation pit. Background Art

[0002] For tower crane foundations in wide foundation pits, placing them at the edge requires designing independent piles and considering the impact of pit deformation (including the effects of the crane foundation load). Furthermore, the crane radius is large, and covering the center of the pit is often impossible. Therefore, tower crane foundations are often placed in wide pits. Four common layouts exist: 1. The crane foundation is located below the main structure's baseplate; 2. The crane foundation is placed on the main structure's baseplate; 3. The crane foundation is suspended using lattice columns; and 4. The structure's baseplate is directly used as the crane foundation.

[0003] Among the four tower crane foundation arrangements, the tower crane foundation is arranged under the main body bottom plate. Although this arrangement can be put into use when the foundation pit is excavated, the foundation pit depth increases significantly, and it is necessary to make long-term reservations for waterproofing and structural connection. During the entire use period, the tower crane foundation is the deepest area, which is prone to water accumulation, resulting in water soaking of the tower crane foundation section and anchor bolts, which is not conducive to the tower crane maintenance and affects the safety of the tower crane; for the tower crane foundation is placed on the main body bottom plate, although this arrangement can reduce the foundation pit depth, it will affect the main structure construction of the tower crane foundation because it takes effect later, and it is difficult to break and takes a long time to break. It is time-consuming and labor-intensive; for the use of lattice column suspended erection, this type of arrangement needs to be constructed before the foundation pit is excavated, and special design is required. The investment cost is high, the tower crane idle period is long, and its safety risk increases with the increase of the foundation pit depth; for the direct use of the structural bottom plate as the tower crane foundation, although this type of arrangement is convenient for construction and saves materials and labor, it is subject to many restrictions such as the thickness of the structural bottom plate, the foundation form and the structural strength, and it can only play a role when the strength of the structural bottom plate reaches the design strength, which is not conducive to the advancement of construction progress, and may have an impact on the structural quality, and there are certain safety risks.

[0004] Therefore, the utility model proposes a tower crane foundation structure in a wide foundation pit. This structure is an improvement and optimization of directly using the structural bottom plate as the tower crane foundation. This structure is simpler and safer to construct, and the tower crane can function earlier, without the need for secondary construction in the later stage. Utility Model Content

[0005] The purpose of the utility model is to provide a tower crane foundation structure in a wide foundation pit, which can solve the problems of cumbersome construction, poor safety, late functioning of the tower crane, and the need for secondary construction in the later stage in the construction of the tower crane foundation.

[0006] To achieve the above-mentioned purpose, the utility model provides a tower crane foundation structure in a wide foundation pit, comprising:

[0007] a tower crane foundation, located at the center of the foundation pit;

[0008] A peripheral bottom plate is arranged around the four sides of the tower crane foundation to enhance the strength of the tower crane foundation;

[0009] Wherein, the tower crane foundation comprises:

[0010] A grid-like upper layer of steel bars, the upper layer of steel bars being formed by connecting transverse upper layer steel bars and longitudinal upper layer steel bars at a certain distance;

[0011] A grid-like middle layer of steel bars is provided below the upper layer of steel bars, wherein the middle layer of steel bars is formed by connecting transverse middle layer steel bars and longitudinal middle layer steel bars at a certain distance;

[0012] A grid-like lower layer of steel bars is provided below the middle layer of steel bars, the lower layer of steel bars being formed by connecting a transverse lower layer of steel bars and a longitudinal lower layer of steel bars at a certain distance;

[0013] A plurality of vertical tie bars are arranged at a certain distance between the upper steel bars and the middle steel bars, and at a certain distance between the middle steel bars and the lower steel bars, for connecting and strengthening the steel bars of different layers.

[0014] Optionally, the thickness of the tower crane foundation is not less than twice the thickness of the surrounding base plate.

[0015] Optionally, the peripheral base plate includes:

[0016] The upper peripheral bottom plate is in a grid-like shape, which is formed by connecting the transverse upper peripheral bottom plate steel bars and the longitudinal upper peripheral bottom plate steel bars at a certain distance;

[0017] A grid-like lower peripheral bottom plate, which is formed by connecting transverse lower peripheral bottom plate steel bars and longitudinal lower peripheral bottom plate steel bars at a certain distance;

[0018] Wherein, the upper peripheral bottom plate and the lower peripheral bottom plate are connected by reinforcement bars and concrete.

[0019] Optionally, the upper peripheral bottom plate is connected to the upper steel bars of the tower crane foundation, and the lower peripheral bottom plate is connected to the middle steel bars of the tower crane foundation.

[0020] Optionally, the upper layer of steel bars and the upper peripheral bottom plate use the same steel bar model, arrangement and connection method.

[0021] Optionally, the diameter of the steel bars used in the upper layer is larger than the diameter of the steel bars used in the upper peripheral bottom plate, and the arrangement density of the steel bars on the upper peripheral bottom plate is increased.

[0022] Optionally, the middle layer steel bars and the lower layer peripheral bottom plate use the same steel bar model, arrangement and connection method.

[0023] Optionally, a waterstop steel plate is welded horizontally in the middle position of the vertical tie bars connecting the upper and middle steel bars; one side of the waterstop steel plate is cast into the surrounding bottom plate, and the other side is cast into the tower crane foundation to prevent moisture from penetrating into the tower crane foundation.

[0024] Optionally, a plurality of tower crane foundations may be arranged at intervals within the range covered by the peripheral bottom plate.

[0025] Optionally, the cross-section of the tower crane foundation structure is T-shaped;

[0026] When the tower crane foundation and the peripheral bottom plate are connected, the upper surface of the tower crane foundation is flush with the upper surface of the peripheral bottom plate, and the lower surface of the tower crane foundation protrudes downward from the lower surface of the peripheral bottom plate.

[0027] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The utility model provides a tower crane foundation structure in a wide foundation pit, which can design the thickness of the surrounding bottom plate and can coordinate with the design and arrangement of the tower crane foundation to better play its role.

[0029] 2. The utility model provides a tower crane foundation structure in a wide foundation pit, which integrates the surrounding bottom plate and the tower crane foundation. It not only strengthens the structural strength of the tower crane foundation during construction, but also can be directly used as the structural bottom plate of the building structure after construction, eliminating the need for secondary construction treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a cross-sectional view of the tower crane foundation structure in a wide foundation pit of the utility model;

[0031] Figure 2 It is a top view of the tower crane foundation structure in a wide foundation pit of the utility model. DETAILED DESCRIPTION

[0032] The following will be combined with the attached Figures 1-2 , the technical content, structural features, achieved objectives and effects of the utility model are described in detail through preferred embodiments.

[0033] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the implementation methods of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0034] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0036] The utility model provides a tower crane foundation structure in a wide foundation pit, which is used to better install the tower crane 7 and can be directly used as the structural base plate of the building structure after construction. Figure 2 As shown, the tower crane foundation structure in the wide foundation pit includes: a tower crane foundation 1, located at the center of the foundation pit; a peripheral base plate 2, which serves as a structural base plate to strengthen the strength of the tower crane foundation 1 and is arranged around the tower crane foundation 1.

[0037] Among them, such as Figure 1As shown, the tower crane foundation 1 includes: a grid-like upper steel bar 3, which is formed by connecting a transverse upper steel bar and a longitudinal upper steel bar at a certain distance; a grid-like middle steel bar 4, which is arranged below the upper steel bar 3, and is formed by connecting a transverse middle steel bar and a longitudinal middle steel bar at a certain distance; a grid-like lower steel bar 5, which is arranged below the middle steel bar 4, and is formed by connecting a transverse lower steel bar and a longitudinal lower steel bar at a certain distance; a plurality of vertical tie bars 8, which are arranged at a certain distance between the upper steel bar 3 and the middle steel bar 4, and at a certain distance between the middle steel bar 4 and the lower steel bar 5, for connecting steel bars of different layers and strengthening the structural strength between steel bars of different layers; a waterstop steel plate 6, which is arranged between the upper steel bar 3 and the middle steel bar 4, for preventing and blocking moisture from entering the interior of the tower crane foundation 1 through the gap at the concrete joint position.

[0038] In a specific embodiment of the present invention, the size of the tower crane foundation 1, that is, the length×width is: 7.5m×7.5m; the size of the peripheral base plate 2, that is, the length×width is: 300m×200m.

[0039] In another embodiment of the present invention, a plurality of tower crane foundations 1 can be provided within the range covered by the peripheral bottom plate 2 and arranged at a certain distance. The peripheral bottom plate 2 is provided around each tower crane foundation 1, such as Figure 2 shown.

[0040] The thickness, length, and width of the tower crane foundation 1 are calculated using specialized structural software based on the crane's operating conditions. Furthermore, the length and width of the tower crane foundation 1 should be increased by 1-1.5 meters based on the calculated values. By appropriately increasing the thickness, length, and width of the tower crane foundation 1, the strength of the tower crane foundation 1 can be effectively improved.

[0041] The thickness of the peripheral bottom plate 2 is determined by the design plan; further, the thickness of the tower crane foundation 1 is not less than 2 times the thickness of the peripheral bottom plate 2.

[0042] Among them, such as Figure 1 As shown, the upper surface of the tower crane foundation 1 is flush with the upper surface of the peripheral bottom plate 2. Since the thickness H2 of the tower crane foundation 1 is greater than the thickness H1 of the peripheral bottom plate 2, the lower surface of the tower crane foundation 1 protrudes downward from the lower surface of the peripheral bottom plate 2. The tower crane foundation 1 and the peripheral bottom plate 2 fixed around it are aligned in a vertical section (as shown in FIG. Figure 1 A T-shaped structure is formed.

[0043] The peripheral floor 2 comprises an upper peripheral floor 21 formed in a grid pattern, comprised of horizontal upper peripheral floor reinforcement bars and vertical upper peripheral floor reinforcement bars connected at regular intervals, and a lower peripheral floor 22 formed in a grid pattern, comprised of horizontal lower peripheral floor reinforcement bars and vertical lower peripheral floor reinforcement bars connected at regular intervals. The upper and lower peripheral floor 21 and 22 are connected by reinforcing bars and concrete disposed therein. The upper peripheral floor 21 is connected to the upper reinforcement bars 3 of the tower crane foundation 1, while the lower peripheral floor 22 is connected to the middle reinforcement bars 4 of the tower crane foundation 1. Specifically, each horizontal upper peripheral floor reinforcement bar on the upper peripheral floor 21 is connected to each horizontal upper reinforcement bar on the upper reinforcement bar 3 via a straight threaded sleeve. Similarly, each horizontal lower peripheral floor reinforcement bar on the lower peripheral floor 22 is connected to each horizontal middle reinforcement bar on the middle reinforcement bar 4 via a straight threaded sleeve.

[0044] The configuration of the upper steel bars 3, middle steel bars 4 and lower steel bars 5 of the tower crane foundation 1 is set according to the operating conditions of the tower crane. Specifically,

[0045] Among them, the upper steel bars 3 and the upper peripheral bottom plate 21 of the tower crane foundation 1 can be pre-selected to use different steel bar models; specifically, if the steel bar model of the pre-selected upper steel bars 3 is smaller than the steel bar model used in the pre-selected upper peripheral bottom plate 21, that is, if the upper steel bars 3 are thinner than the steel bars used in the upper peripheral bottom plate 21, the upper steel bars 3 of the tower crane foundation 1 will be constructed according to the steel bar model used in the upper peripheral bottom plate 21; that is, the upper steel bars 3 and the upper peripheral bottom plate 21 use the same steel bar model, arrangement and connection method.

[0046] If the pre-selected steel bar model of the upper steel bar 3 is larger than the pre-selected steel bar model used for the upper peripheral bottom plate 21, that is, if the upper steel bar 3 is thicker than the steel bar used for the upper peripheral bottom plate 21, the upper peripheral bottom plate 21 will be encrypted, that is, the upper peripheral bottom plate 21 will be arranged in a closer and more dense manner.

[0047] By adopting thicker upper steel bars 3 or increasing the arrangement density of the upper peripheral bottom plates 21 , the strength of the tower crane foundation 1 itself and its integrity with the peripheral bottom plates 2 can be further improved.

[0048] Among them, the middle layer steel bars 4 are a structure different from the traditional tower crane foundation. The middle layer steel bars 4 have the same steel bar model, arrangement and connection method as the lower peripheral bottom plate 22, so as to better form overall force after being connected to the lower peripheral bottom plate 22.

[0049] The lower layer of steel bars 5 are reinforced using the calculation results of the tower crane foundation 1 .

[0050] The structure of the tie bars 8 is set according to the conventional construction requirements of the tower crane foundation 1.

[0051] A waterstop steel plate 6 is welded transversely to the middle of the vertical tie bars 8 connecting the upper and middle layers of steel bars 3 and 4. This plate is perpendicular to the tie bars 8 and parallel to the upper layers of steel bars 3. After concrete is poured, one side of the plate is cast into the perimeter floor 2, and the other side is cast into the tower crane foundation 1. This effectively prevents moisture from penetrating through gaps in the concrete joints and entering the interior of the tower crane foundation 1. The plate is positioned exactly midway between the upper and lower perimeter floors 21 and 22.

[0052] In a specific embodiment of the present invention, the tower crane foundation 1 and the peripheral base plate 2 are integrated into one structure. Therefore, after the tower crane 7 is removed after use, the tower crane foundation 1 can be used as the structural base plate of the building structure without the need for secondary construction.

[0053] The utility model provides a layout form of a tower crane foundation in a wide foundation pit, and the layout process is as follows:

[0054] S1, independently design and calculate the tower crane foundation 1 to determine its thickness, length and width.

[0055] S2, determine the thickness of the peripheral bottom plate 2 according to the design plan;

[0056] Among them, the thickness of the tower crane foundation 1 is not less than 2 times the thickness of the surrounding base plate 2; the length and width of the tower crane foundation 1 should be expanded by 1-1.5 meters of redundancy based on the calculation results.

[0057] S3, determining the configuration of the upper steel bars 3, the middle steel bars 4 and the lower steel bars 5 of the tower crane foundation 1;

[0058] S3.1 Determine the steel bar type of the upper reinforcement 3 of the tower crane foundation 1 and the steel bar type of the upper peripheral base plate 21; if the steel bar type of the upper reinforcement 3 is smaller than the steel bar type of the upper peripheral base plate 21, construct the upper reinforcement 3 of the tower crane foundation 1 according to the steel bar type of the upper peripheral base plate 21; if the steel bar type of the upper reinforcement 3 is larger than the steel bar type of the upper peripheral base plate 21, then increase the density of the upper peripheral base plate 21 to further improve the strength of the tower crane foundation 1 itself and its integrity with the peripheral base plate 2;

[0059] S3.2, the structure and connection of the middle layer steel bars 4 are the same as those of the lower peripheral bottom plate 22;

[0060] S3.3, the lower layer steel bars 5 are reinforced using the calculation results of the tower crane foundation 1.

[0061] S4, connecting the designed tower crane foundation 1 and the peripheral bottom edge 2 to combine the two into one;

[0062] Specifically, the upper surface of the tower crane foundation 1 must be aligned with the upper surface of the peripheral bottom plate 2, and then the upper peripheral bottom plate 21 must be connected to the upper steel bars 3 of the tower crane foundation 1, and then the lower peripheral bottom plate 22 must be connected to the middle steel bars 3 of the tower crane foundation 1.

[0063] Furthermore, during construction, the tower crane foundation 1 can be constructed first, and the first section of the tower crane 7 close to the ground can be pre-cast in the tower crane foundation 1, and then the main components of the tower crane 7 and the first section of the tower crane 7 can be connected with the high-strength bolts; after the tower crane 7 is installed, the surrounding base plate 2 can be constructed according to the subsequent construction schedule to form a whole with the tower crane foundation 1.

[0064] S5, after the tower crane 7 is dismantled after use, the tower crane foundation 1 is integrated with the surrounding bottom plate 2 and can be used as the structural bottom plate of the building structure without the need for secondary construction processing.

[0065] In summary, the utility model provides a tower crane foundation structure in a wide foundation pit, which is an improvement and optimization of directly using the structural bottom plate as the tower crane foundation. This structure is simpler and safer to construct, and the tower crane can function earlier, without the need for secondary construction in the later stage.

[0066] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be construed as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will become readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A tower crane foundation structure in a wide foundation pit, characterized in that: Include: A tower crane foundation (1) is located at the center of the foundation pit; A peripheral bottom plate (2) is arranged around the four sides of the tower crane foundation (1) to strengthen the strength of the tower crane foundation (1); Wherein, the tower crane foundation (1) comprises: An upper layer of steel bars (3) in a grid shape, wherein the upper layer of steel bars (3) is formed by connecting a transverse upper layer of steel bars and a longitudinal upper layer of steel bars at a certain distance; A grid-shaped middle layer of steel bars (4) is arranged below the upper layer of steel bars (3), and the middle layer of steel bars (4) is formed by connecting transverse middle layer steel bars and longitudinal middle layer steel bars at a certain distance; A grid-like lower layer of steel bars (5) is provided below the middle layer of steel bars (4), wherein the lower layer of steel bars (5) is formed by connecting a transverse lower layer of steel bars and a longitudinal lower layer of steel bars at a certain distance; A plurality of vertical tie bars (8) are arranged at a certain distance between the upper steel bars (3) and the middle steel bars (4), and at a certain distance between the middle steel bars (4) and the lower steel bars (5), for connecting and strengthening the steel bars of different layers.

2. The tower crane foundation structure according to claim 1, wherein: The thickness of the tower crane foundation (1) is not less than twice the thickness of the surrounding bottom plate (2).

3. The tower crane foundation structure according to claim 1, wherein: The peripheral bottom plate (2) comprises: An upper peripheral bottom plate (21) in a grid shape is formed by connecting transverse upper peripheral bottom plate steel bars and longitudinal upper peripheral bottom plate steel bars at a certain distance; A grid-like lower peripheral bottom plate (22) is formed by connecting transverse lower peripheral bottom plate steel bars and longitudinal lower peripheral bottom plate steel bars at a certain distance; The upper peripheral bottom plate (21) and the lower peripheral bottom plate (22) are connected by reinforcement bars and concrete.

4. The tower crane foundation structure according to claim 3, wherein: The upper peripheral bottom plate (21) is connected to the upper steel bars (3) of the tower crane foundation (1), and the lower peripheral bottom plate (22) is connected to the middle steel bars (4) of the tower crane foundation (1).

5. The tower crane foundation structure according to claim 3, wherein: The upper layer steel bars (3) and the upper layer peripheral bottom plate (21) adopt the same steel bar type, arrangement and connection method.

6. The tower crane foundation structure according to claim 3, wherein: The diameter of the steel bars used in the upper layer of steel bars (3) is greater than the diameter of the steel bars used in the upper layer of peripheral bottom plate (21), and the arrangement density of the steel bars on the upper layer of peripheral bottom plate (21) is increased.

7. The tower crane foundation structure according to claim 3, wherein: The middle layer steel bars (4) and the lower layer peripheral bottom plate (22) adopt the same steel bar type, arrangement and connection method.

8. The tower crane foundation structure according to claim 1, wherein: A water-stop steel plate (6) is welded transversely at the middle position of the vertical tie bars (8) connecting the upper steel bars (3) and the middle steel bars (4); one side of the water-stop steel plate (6) is cast into the surrounding bottom plate (2), and the other side is cast into the tower crane foundation (1) to prevent moisture from penetrating into the tower crane foundation (1).

9. The tower crane foundation structure according to claim 1, wherein: The tower crane foundation (1) can be arranged in plurality at intervals within the range covered by the peripheral bottom plate (2).

10. The tower crane foundation structure according to claim 2, wherein: The cross section of the tower crane foundation structure is T-shaped; When the tower crane foundation (1) and the peripheral bottom plate (2) are connected, the upper surface of the tower crane foundation (1) is flush with the upper surface of the peripheral bottom plate (2), and the lower surface of the tower crane foundation (1) protrudes downward from the lower surface of the peripheral bottom plate (2).

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