Formwork-free and support-free tower crane foundation structure

Abstract

The utility model discloses a formwork-free and support-free tower crane foundation structure which comprises a prefabricated outer frame, the prefabricated outer frame comprises four corner type prefabricated parts which are distributed in a rectangular mode, and a plurality of T-shaped prefabricated parts are spliced between the adjacent corner type prefabricated parts. The corner type prefabricated part comprises an angle type base and a right-angle type side plate vertically arranged on the angle type base, and the T-shaped prefabricated part comprises a linear type base and a linear type side plate vertically arranged on the linear type base; the channel steel is connected between the linear side plates of the opposite T-shaped prefabricated parts and between the corner side plates of the right-angle side plates of the opposite corner-type prefabricated parts in a transversely and longitudinally staggered mode; the four tower crane ground feet are distributed in the prefabricated outer frame in a vertical rectangle mode and used for being connected with a tower crane; and the concrete covers the channel steel and is poured in the prefabricated outer frame, and the tower crane foot margin is exposed. The utility model has the advantages of high construction efficiency, short period, low cost, low carbon and environmental protection.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, and particularly relates to a tower crane foundation structure without formwork and support. Background Technique

[0002] The conventional construction method of the tower crane foundation is conventional processes such as pouring a cushion layer, erecting formwork and support facilities, tying steel bars and pouring concrete. Among them, the formwork usually adopts a masonry structure or a wooden formwork structure and is erected on site. After the concrete reaches the strength standard, the formwork and support facilities need to be removed and transported outside the site. Due to the removal and transportation processes of the formwork and support facilities, the construction process of the tower crane foundation is cumbersome, the efficiency is low, a large amount of manpower and transportation equipment are required, resulting in high labor costs and transportation costs. Moreover, when the formwork and support facilities are removed during construction, there are problems of polluting the surrounding environment and being not low-carbon and not environmentally friendly. Content of the Utility Model

[0003] The purpose of the utility model is to provide a tower crane foundation structure without formwork and support, so as to solve the problems of cumbersome construction, low efficiency, high cost and environmental unfriendliness caused by the removal and transportation processes of the formwork and support facilities during the construction of the traditional tower crane foundation.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is: a tower crane foundation structure without formwork and support, including:

[0005] A precast outer frame, the precast outer frame includes four corner-shaped precast components distributed in a rectangle, and a plurality of T-shaped precast components are spliced between adjacent corner-shaped precast components. The corner-shaped precast component includes a corner-shaped base and a right-angled side plate vertically arranged thereon. The T-shaped precast component includes a straight base and a straight side plate vertically arranged thereon;

[0006] Channel steels, which are multiple channels horizontally and vertically connected between the straight side plates of the opposite T-shaped precast components and between the corner side plates of the opposite right-angled side plates of the corner-shaped precast components;

[0007] Tower crane anchor bolts, which are four vertically arranged in a rectangle in the precast outer frame and are used to connect with the tower crane, and the tower crane anchor bolts are exposed outside the precast outer frame;

[0008] Concrete, which is poured in the precast outer frame covering the channel steels and exposes the tower crane anchor bolts.

[0009] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, the precast outer frame further includes: a plurality of second ear plates vertically arranged on the inner side of the end face at the splicing position of adjacent straight side plates and on the inner side of the end face at the splicing position of the straight side plates and the corner side plates of the right-angle side plates. Adjacent straight side plates and the corner side plates between the straight side plates and the right-angle side plates are connected by high-strength bolts passing through their respective second ear plates.

[0010] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, the precast outer frame further includes: a plurality of tie bars horizontally penetrating and connecting the straight side plates and the corner side plates of the right-angle side plates located on the same straight line. A plurality of reserved holes for the tie bars to penetrate are provided at the thickness centers of the corresponding straight side plates and the corner side plates of the right-angle side plates.

[0011] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, the channel steel is connected by first ear plates embedded on the inner surfaces of the straight side plates and the corner side plates of the right-angle side plates.

[0012] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, both ends of the lowermost channel steel are connected to the straight bases of the T-shaped precast members instead of connecting to the straight side plates and are connected to the angular bases of the corner precast members instead of connecting to the right-angle side plates.

[0013] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, the horizontally and vertically intersecting channel steels are vertically crossed and overlapped with each other, and tie bolts are vertically connected between the cross nodes of each channel steel.

[0014] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, a plurality of short reinforcing bars distributed on both sides of the web are welded between the web and the flange of the channel steel.

[0015] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, lifting lugs are provided on the upper end faces of the corner side plates of the straight side plates and the right-angle side plates.

[0016] Furthermore, for the tower crane foundation structure without formwork and shoring provided by the present utility model, the precast outer frame is buried in the soil body.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] The tower crane foundation structure provided by the utility model without formwork and support is constructed by prefabricating an outer frame on the construction site, connecting channel steels distributed in a crisscross pattern horizontally and vertically inside the prefabricated outer frame, and arranging tower crane anchor bolts at corresponding positions inside the prefabricated outer frame to connect with the tower crane. Then, concrete is poured inside the prefabricated outer frame to cover the channel steels and expose the tower crane anchor bolts, thereby forming the tower crane foundation structure. During the construction of the entire tower crane foundation structure, the prefabricated outer frame is used as the formwork system for the cast-in-place concrete. After the concrete is poured, it adheres to the prefabricated outer frame to jointly form the concrete structure of the tower crane foundation, eliminating the need to remove the prefabricated outer frame, without an additional formwork system or formwork support facilities, reducing the construction procedures of removing and transporting the formwork system and its support facilities that are necessary after the traditional tower crane foundation construction. Therefore, it avoids the problems of high labor costs, high transportation costs, and pollution to the surrounding environment when removing the formwork system and its support facilities of the traditional tower crane foundation. It not only has the effect of low-carbon environmental protection but also improves the construction efficiency of the tower crane foundation and shortens the project cycle.

[0019] The tower crane foundation structure provided by the utility model without formwork and support is composed of four corner-shaped prefabricated components and several T-shaped prefabricated components spliced together to form the prefabricated outer frame, realizing the rapid construction of the prefabricated outer frame and having the advantages of convenient construction and high construction efficiency.

[0020] The tower crane foundation structure provided by the utility model without formwork and support has the corner-shaped base of the corner-shaped prefabricated component and the straight-shaped base of the T-shaped prefabricated component set on the ground, and the prefabricated outer frame is tied by channel steels distributed in a crisscross pattern horizontally and vertically, improving the stability of the prefabricated outer frame set on the ground; by using channel steels instead of the horizontal and vertical steel bars during the traditional tower crane foundation construction as the steel skeleton, on the one hand, it improves the structural strength of the channel steels as the steel skeleton, thereby enhancing the structural strength of the tower crane foundation structure, on the other hand, it improves the bonding property between the channel steels and the concrete; and on the other hand, it improves the tying force on the prefabricated outer frame, ensuring the structural stability of the prefabricated outer frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the tower crane foundation structure without formwork and support;

[0022] Figure 2 is a plan structural schematic diagram of the tower crane foundation structure without formwork and support;

[0023] Figure 3 is an elevation structural schematic diagram of the tower crane foundation structure without formwork and support;

[0024] Figure 4 is a three-dimensional structural schematic diagram of the corner-shaped prefabricated component;

[0025] Figure 5 is a three-dimensional structural schematic diagram of the T-shaped prefabricated component;

[0026] Figure 6 It is a three-dimensional structure schematic diagram of a T-shaped precast component penetrating a tie bar.

[0027] Figure 7 It is an enlarged view of the joint of two adjacent T-shaped precast components and the connection of the bottom channel steel to the T-shaped precast component.

[0028] Figure 8 It is an enlarged view of the joint of the top channel steel connected to the T-shaped precast component.

[0029] Figure 9 It is an enlarged view of the connection of the channel steels distributed horizontally and vertically through tie bolts.

[0030] Figure 10 It is a three-dimensional structure schematic diagram of a precast outer frame spliced in a pit body.

[0031] Figure 11 It is a three-dimensional structure schematic diagram of backfilling the pit body and embedding the precast outer frame in the wall.

[0032] Figure 12 It is a three-dimensional structure schematic diagram of connecting each channel steel inside the precast outer frame.

[0033] Figure 13 It is a three-dimensional structure schematic diagram of constructing a tower crane anchor bolt inside the precast outer frame.

[0034] As shown in the figure:

[0035] 10. Tower crane foundation structure without formwork and shoring;

[0036] 100. Precast outer frame, 110. Corner-shaped precast component, 111. Corner base, 112. Right-angled side plate, 120. T-shaped precast component, 121. Straight base, 122. Straight side plate, 130. Second ear plate, 140. High-strength bolt, 150. Tie bar, 160. Reserved hole, 170. First ear plate, 180. Lifting ear, 190. Embedded bolt hole;

[0037] 200. Channel steel, 210. Tie bolt, 220. Short reinforcing bar;

[0038] 300. Tower crane anchor bolt;

[0039] 400. Pit body;

[0040] 500. Soil mass. Specific implementation method

[0041] The present utility model will be described in detail below with reference to the accompanying drawings: According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0042] Please refer to Figures 1 to 9 , an embodiment of the present utility model provides a tower crane foundation structure 10 without formwork and without bracing, including a precast outer frame 100, channel steels 200, and tower crane anchor bolts 300, wherein:

[0043] The precast outer frame 100, the precast outer frame 100 includes four corner-type precast members 110 distributed in a rectangle, and a plurality of T-shaped precast members 120 are spliced between adjacent corner-type precast members 110. The corner-type precast member 110 includes a corner base 111 and a right-angle side plate 112 vertically arranged thereon. The T-shaped precast member 120 includes a straight base 121 and a straight side plate 122 vertically arranged thereon. That is, the precast outer frame 100 is a rectangular frame structure spliced by four corner-type precast members 110 and several T-shaped precast members 120. The rectangular distribution includes a rectangular distribution and a square distribution; the thickness specifications of the corner base 111 and the straight base 121 are the same, and the height specifications of the right-angle side plate 112 and the straight side plate 122 are the same. The corner-type precast member 110 and the T-shaped precast member 120 can both be precast with a φ6mm@100 steel mesh and C20 concrete, and the size specifications can be 1m wide, 0.1m thick, and 1.7m high. Figure 1 Four spliced T-shaped precast members 120 are exemplified between adjacent corner-type precast members 100 on each outer side of each side of the precast outer frame 100 in [[ ]], but it is not limited to four, and can be adjusted according to the specifications and dimensions of the tower crane.

[0044] The channel steels 200 are multiple channels that are horizontally and vertically connected between the straight side plates 122 of the opposing T-shaped precast members 120 and between the corner side plates of the opposing right-angle side plates 112 of the corner-type precast members 110. That is, channel steels 200 are connected between the straight side plates 122 of every two opposing T-shaped precast members 120, and channel steels 200 are connected between the corner side plates of the opposing right-angle side plates 112 of the two opposing corner-type precast members 110. Four channel steels 200 are exemplified in the figure, two of which are horizontal channel steels and two are vertical channel steels. The openings of the horizontal channel steels face upward, and the openings of the vertical channel steels face the straight side plates 122, that is, the horizontal channel steels are horizontally arranged and the vertical channel steels are vertically arranged.

[0045] The tower crane foot 300 is four vertical rectangular feet arranged in the prefabricated outer frame 100, which are used to connect with the tower crane, and the tower crane foot 300 is exposed from the prefabricated outer frame 100. The tower crane foot 300 can be a steel column or a reinforced concrete column. In order to improve the stability of the tower crane foot 300, the steel column can be welded to the channel steel 200, or the steel cage of the reinforced concrete column can be welded to the channel steel 200.

[0046] Concrete (not shown) covering the channel steel 200 is poured inside the prefabricated outer frame 100 and the tower crane foot 300 is exposed.

[0047] The formwork-free and support-free tower crane foundation structure 10 provided in the embodiment of the utility model is formed by constructing a prefabricated outer frame 100, connecting channel steels 200 that are distributed horizontally and vertically in the prefabricated outer frame 100, and arranging tower crane feet 300 connected to the corresponding positions of the tower crane in the prefabricated outer frame 100, covering the channel steels 200, pouring concrete in the prefabricated outer frame 100 and exposing the tower crane feet 300, thereby forming a tower crane foundation structure. During the construction of the entire tower crane foundation structure, the prefabricated outer frame 100 is used as the formwork system for cast-in-place concrete. After the concrete is poured, it is bonded to the prefabricated outer frame 100 to form a concrete structure of the tower crane foundation. There is no need to dismantle the prefabricated outer frame 100, no additional formwork system, and no formwork support facilities, that is, no formwork and no support, which reduces the construction process of dismantling and transporting the formwork system and its support facilities after the construction of the traditional tower crane foundation, thereby avoiding the high labor cost and high transportation cost when dismantling the formwork system and its support facilities of the traditional tower crane foundation, as well as the pollution of the surrounding environment. It not only has the effect of low carbon and environmental protection, but also improves the construction efficiency of the tower crane foundation and shortens the project period.

[0048] The formwork-free and support-free tower crane foundation structure 10 provided in the embodiment of the utility model is composed of a prefabricated outer frame 100 spliced ​​by four corner prefabricated components 110 and a plurality of T-shaped prefabricated components 120, thereby realizing the rapid construction of the prefabricated outer frame 100 and having the advantages of convenient construction and high construction efficiency.

[0049] The tower crane foundation structure 10 without formwork and shoring provided by the embodiment of the utility model has the angular base 111 of the corner-shaped precast member 110 and the linear base 121 of the T-shaped precast member 120 arranged on the ground, and the precast outer frame 100 is tied by the channel steels 200 distributed in a horizontal and vertical staggered manner, thereby improving the stability of the precast outer frame 100 arranged on the ground; the channel steels 200 are used to replace the horizontal and vertical steel bars in the traditional tower crane foundation construction as the steel skeleton. On the one hand, the structural strength of the channel steels 200 as the steel skeleton is improved, thereby improving the structural strength of the tower crane foundation structure. On the other hand, the bonding property between the channel steels 200 and the concrete is improved; on the other hand, the tying force on the precast outer frame 100 is improved, ensuring the structural stability of the precast outer frame 100; on the other hand, the channel steels 200 can play roles such as bearing force, shear resistance, crack resistance, and punching shear resistance.

[0050] Please refer to Figure 2 , Figures 4 to 5 , Figures 7 to 8 , in order to improve the reliability of the splicing between the linear precast members 120 of the precast outer frame 100 and between them and the corner-shaped precast member 110, the tower crane foundation structure 10 without formwork and shoring provided by the embodiment of the utility model, the precast outer frame 100 may further include: a plurality of second ear plates 130 vertically arranged on the inner side of the end face at the splicing position of the adjacent linear side plates 122 and on the inner side of the end face at the splicing position of the linear side plate 122 and the corner side plate of the right-angle side plate 112. The adjacent linear side plates 122 and the corner side plates between the linear side plate 122 and the right-angle side plate 112 are connected by high-strength bolts 140 passing through their respective second ear plates 130. That is, the outer surface of the second ear plate 130 is aligned with the end faces of the linear side plate 122 and the corner side plate of the right-angle side plate 112.

[0051] Please refer to Figures 5 to 6, in order to further improve the structural stability of the spliced precast outer frame 100, for the tower crane foundation structure 10 without formwork and shoring provided by the embodiments of the present utility model, the precast outer frame 100 may further include: a plurality of tie bars 150 horizontally penetrating and connecting at the corner side plates of the linear side plate 122 and the right-angle side plate 112 located on the same straight line, and a plurality of reserved holes 160 for the tie bars 150 to penetrate are provided at the thickness centers of the corresponding corner side plates of the linear side plate 122 and the right-angle side plate 112. The tie bars 150 can ensure that the corner side plates of the linear side plate 122 and the right-angle side plate 112 are connected in a straight line, and avoid the problem that the second ear plate 130 is inclined under the action of external force during splicing, resulting in gaps between adjacent linear side plates 122 and between the adjacent linear side plate 122 and the corner side plate of the right-angle side plate 112, thereby improving the structural stability of the spliced precast outer frame 100. 5 reserved holes 160 are illustrated in the figure, corresponding to 5 tie bars 150 penetrating through. Among them, the second ear plate 130 is embedded at the corresponding positions of the T-shaped precast member 120 and the corner-shaped precast member 110.

[0052] Please refer to Figure 1 , Figures 4 to 8 , Figures 10 to 13 , in order to facilitate the connection of the channel steel 200 to the precast outer frame 100, for the tower crane foundation structure 10 without formwork and shoring provided by the embodiments of the present utility model, the channel steel 200 is connected through the first ear plates 170 embedded on the inner surfaces of the linear side plate 122 and the corner side plate of the right-angle side plate 112. Among them, the first ear plates 170 adjust their directions according to the distribution direction of the channel steel 200, that is, the directions of the first ear plates 170 corresponding to the horizontal channel steel 200 and the first ear plates 170 corresponding to the vertical channel steel 200 are different and there is a height difference. Among them, the first ear plates 170 and the channel steel 200 can be connected by bolts.

[0053] Please refer to with emphasis Figures 4 to 7 , in order to improve the structural stability of the spliced precast outer frame 100, for the tower crane foundation structure 10 without formwork and shoring provided by the embodiments of the present utility model, both ends of the bottommost channel steel 200 are connected to the linear base 121 of the T-shaped precast member 120 to replace the connection to the linear side plate 122 and to the angular base 111 of the corner-shaped precast member 110 to replace the connection to the right-angle side plate 112, and embedded bolt holes 190 are provided on the corresponding linear base 121 and angular base 111. The channel steel 200 is connected to the embedded bolt holes 190 by bolts. At this time, the bottommost channel steel 200 fixes the base of the precast outer frame 100 and presses down on the base by gravity, thereby improving the structural stability of the precast outer frame 100 and its stability when set on the ground.

[0054] Please refer toFigures 8 to 9 Figures 8 to 9 , in order to improve the reliable connection between the channel steels 200, the tower crane foundation structure 10 without formwork and without support provided by the embodiment of the present utility model has the channel steels 200 connected in a horizontal and vertical cross pattern, which are vertically crossed and overlapped with each other, and tie bolts 210 are vertically connected between the cross nodes of each channel steel 200.

[0055] Please refer to Figures 8 to 9 Figures 8 to 9 , in order to improve the bonding property between the channel steel 200 and the concrete, the tower crane foundation structure 10 without formwork and without support provided by the embodiment of the present utility model has a plurality of short reinforcing bars 200 distributed on both sides of the web plate welded between the web plate and the flange plate of the channel steel 200.

[0056] Please refer to Figures 4 to 5 Figures 4 to 5 , in order to facilitate the hoisting of the corner-shaped precast member 110 and the T-shaped precast member 120, the tower crane foundation structure 10 without formwork and without support provided by the embodiment of the present utility model has lifting lugs 180 arranged on the upper end surfaces of the corner side plates of the straight side plates 122 and the right-angle side plates 112.

[0057] Please refer to Figures 10 to 13 Figures 10 to 13 , in order to improve the stability of the tower crane foundation structure 10, the tower crane foundation structure 10 without formwork and without support provided by the embodiment of the present utility model has the precast outer frame 100 buried in the soil body 500.

[0058] Please refer to Figures 10 to 13 and in combination with Figures 1 to 9 Figures 1 to 9 , the construction method of the tower crane foundation structure 10 without formwork and without support provided by the embodiment of the present utility model includes:

[0059] Step S601, please refer to Figure 10 Figure 10 , excavate the soil body to form a pit 400. In this step S601, a cushion layer can be cast in situ in the pit 400.

[0060] Step S602, please refer to Figure 10 Figure 10 , hoist the corner-shaped precast member 110 and the T-shaped precast member 120 onto the ground in the pit 400, and splice the corner-shaped precast member 110 and the T-shaped precast member 120 in the pit 400 to form a precast outer frame 100. Among them, the T-shaped precast members 120 and between the T-shaped precast member 120 and the corner-shaped precast member 110 are connected by high-strength bolts 140 passing through two second ear plates 130 that are mutually attached at the splicing part. In this step, the tie reinforcing bars 150 can be passed through the reserved holes 160 of the corner side plates of the straight side plates 122 and the right-angle side plates 112 on the same straight line to improve the structural stability of the splicing of the precast outer frame 100. When there is a cushion layer, the precast outer frame 100 is arranged on the cushion layer, that is, the angular base 111 of the corner-shaped precast member 110 and the straight base 121 of the T-shaped precast member 120 are arranged on the cushion layer.

[0061] Step S603, please refer to Figures 10 to 11 , backfill the pit 400 with soil, so that the soil 500 is pressed on the angle base 111 of the corner prefabricated component 110 and the straight base 121 of the T-shaped prefabricated component 120, so that the prefabricated outer frame 100 is buried in the soil 500, and the stability of the prefabricated outer frame 100 is improved. The horizon of the soil 500 can be at the upper elevation of the corner prefabricated component 110 and the T-shaped prefabricated component 120. In order to improve the embedding effect, the angle base 111 of the corner prefabricated component 110 is located at a wider distance on the outer side of the right-angled side plate 112, and the angle base 111 is located at a narrower distance on the inner side of the right-angled side plate 112; at the same time, the straight base 121 of the T-shaped prefabricated component 120 is located at a wider distance on the outer side of the straight side plate 122, and the straight base 121 is located at a narrower distance on the inner side of the straight side plate 122. The angled base 111 exposed on the outer side of the right-angled side plate 111 and the straight base 121 exposed on the outer side of the straight side plate 122 can be backfilled with soil better, so that more backfill soil is pressed against the base, thereby improving the stability of the prefabricated outer frame 100 buried in the soil 500.

[0062] Step S604, please refer to Figure 12 , install the channel steels 200 staggered in the horizontal and vertical directions in the prefabricated outer frame 100 from bottom to top. The channel steels 200 are connected by bolts through the first ear plate 170 or the embedded bolt hole 190. The order of step S604 and step S603 can be interchanged, that is, the channel steels 200 are constructed first, and then the soil is backfilled. In this way, when the lateral soil pressure of the backfill soil is applied to the outer surface of the prefabricated outer frame 100, the channel steels 200 can provide a counter force support for the soil pressure of the prefabricated outer frame 100, so as to ensure the structural stability of the prefabricated outer frame 100 when the soil is backfilled, and prevent the prefabricated outer frame 100 from being disconnected at each joint.

[0063] Step S605, please refer to Figure 13 , the tower crane foot 300 is constructed at the position corresponding to the tower crane in the prefabricated outer frame 100. Additional transverse and longitudinal steel bars can also be tied at the positions of the staggered channel steels 200 in the prefabricated outer frame 100 to improve the structural strength of the tower crane foundation structure 100.

[0064] Step S606, pouring concrete in the prefabricated outer frame 100 to cover the channel steel 200 and expose the tower crane foot 300. In this step S606, when there are additionally tied transverse and longitudinal steel bars, the transverse and longitudinal steel bars are simultaneously covered and poured into the prefabricated outer frame 100. Lightning protection facilities can be constructed on the tower crane foundation structure 10. In order to prevent the lifting lug 180 exposed on the horizon from affecting the passage of construction machinery or construction workers, the lifting lug 180 can be cut after the strength of the poured concrete reaches the standard.

[0065] The present utility model is not limited to the above specific embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model fall within the scope of protection of the present utility model. Those skilled in the art can make other levels of modifications and changes to the present utility model. Thus, if these modifications and changes of the present utility model are within the scope of the claims of the present utility model, the present utility model also intends to include these alterations and changes.

Claims

1. A formwork-free and support-free tower crane foundation structure, characterized in that: include: A prefabricated outer frame, wherein the prefabricated outer frame comprises four rectangularly distributed corner prefabricated components, wherein a plurality of T-shaped prefabricated components are spliced ​​between adjacent corner prefabricated components, wherein the corner prefabricated components comprise an angled base and a right-angled side plate vertically arranged thereon, and wherein the T-shaped prefabricated components comprise a straight base and a straight side plate vertically arranged thereon; Channel steel is a plurality of channels that are connected horizontally and vertically between the straight side plates of the opposite T-shaped prefabricated components and between each corner side plate of the right-angled side plates of the opposite corner prefabricated components; Tower crane footings are four vertical rectangular feet arranged in the prefabricated outer frame and used for connecting with the tower crane. The tower crane footings are exposed from the prefabricated outer frame. Concrete, covering channel steel, is poured in the prefabricated outer frame and exposes the tower crane foot.

2. The formwork-free and support-free tower crane foundation structure according to claim 1 is characterized in that: The prefabricated outer frame also includes: a plurality of second ear plates vertically arranged on the inner sides of the end faces of the joints of adjacent linear side panels and the inner sides of the end faces of the joints of the linear side panels and the corner side panels of the right-angle side panels, and the adjacent linear side panels and the corner side panels of the linear side panels and the right-angle side panels are connected by high-strength bolts passing through their respective second ear plates.

3. The formwork-free and support-free tower crane foundation structure according to claim 1 or 2, characterized in that: The prefabricated outer frame also includes: a plurality of tie steel bars that are horizontally connected and penetrate the corner side panels of the straight side panels and the right-angle side panels located on the same straight line, and a plurality of reserved openings for the tie steel bars to penetrate are provided at the thickness centers of the corresponding straight side panels and the corner side panels of the right-angle side panels.

4. The formwork-free and support-free tower crane foundation structure according to claim 1 is characterized in that: The channel steel is connected by a first ear plate pre-buried on the inner surface of the straight side plate and the inner surface of the corner side plate of the right-angle side plate.

5. The formwork-free and support-free tower crane foundation structure according to claim 1 is characterized in that: Both ends of the lowest channel steel are connected to the straight base of the T-shaped prefabricated component instead of being connected to the straight side plate and to the angle base of the corner prefabricated component instead of being connected to the right-angle side plate.

6. The formwork-free and support-free tower crane foundation structure according to claim 1 is characterized in that: The channel steels connected in a staggered manner horizontally and vertically cross each other and overlap each other, and tie bolts are vertically connected between the intersection nodes of each channel steel.

7. The formwork-free and support-free tower crane foundation structure according to claim 1 is characterized in that: A plurality of short steel bars distributed on both sides of the web are welded between the web and the wing of the channel steel.

8. The formwork-free and support-free tower crane foundation structure according to claim 1 is characterized in that: The upper end surface of each corner side plate of the straight side plate and the right-angle side plate is provided with a lifting ear.

9. The formwork-free and support-free tower crane foundation structure according to claim 1 is characterized in that: The prefabricated outer frame is buried in the soil.

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