CN218088680U - Pre-buried nested combination formula tower crane festival device - Google Patents

Abstract

The utility model discloses a pre-embedded nested combined tower crane section device, which comprises an upper bearing platform, a large lattice tower crane section, a small lattice tower crane section, a first connecting frame, a first fixing frame, a lattice column, a connecting mechanism, a fixing block and a filling pile, wherein the lattice column is fixedly connected with the bottom end of the upper bearing platform, the outer wall of the lattice column is fixedly connected with the first connecting frame, and the outer wall of the first connecting frame is fixedly connected with the first fixing frame; big lattice tower crane festival fixed mounting and the inside of last cushion cap, coupling mechanism sets up in the inner wall of big lattice tower crane festival, coupling mechanism and little lattice tower crane festival fixed connection, the fixed block is installed in the outer wall of big lattice tower crane festival, the bored concrete pile is installed in the upper end of last cushion cap. The utility model discloses not only the cost of transportation is low, and the construction progress is fast moreover.

Description

Pre-buried nested combination formula tower crane festival device

Technical Field

The utility model relates to a pre-buried nested combination formula tower crane festival device belongs to tower crane technical field.

Background

With the gradual popularization and application of building industrialization, the prefabricated concrete structure is developed rapidly, large-scale hoisting machinery is urgently needed to be matched, the demand of a tower crane is particularly outstanding, the demand of the large-scale tower crane is insufficient due to the development of PC, and the lease price of the tower crane rises linearly.

The existing embedded bushing type tower crane joint is not convenient for replacing a small-sized tower crane and a large-sized tower crane, the traditional construction requires the whole process to use a large-sized tower crane (the large-sized tower crane cannot completely utilize the hoisting working condition of the large-sized tower crane) or redesign construction is carried out on an original tower crane foundation bearing platform to carry out secondary replacement of the large-sized tower crane (limited by the site and large potential safety hazard), so that the increase of construction cost and the delay of construction progress are caused.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the condition that cost of transportation is high among the prior art, the construction progress is slow, the utility model provides a pre-buried nested combination formula tower crane festival device.

The technical scheme is as follows: in order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a pre-buried nested combination formula tower crane festival device, includes that upper bearing platform, big lattice tower crane festival, little lattice tower crane festival, first link, first mount, lattice column, coupling mechanism, fixed block and bored concrete pile, wherein:

the lattice column is fixedly connected to the bottom end of the upper bearing platform, the outer wall of the lattice column is fixedly connected with the first connecting frame, and the outer wall of the first connecting frame is fixedly connected with the first fixing frame;

big lattice tower crane festival fixed mounting and the inside of last cushion cap, coupling mechanism sets up in the inner wall of big lattice tower crane festival, coupling mechanism and little lattice tower crane festival fixed connection, the fixed block is installed in the outer wall of big lattice tower crane festival, the bored concrete pile is installed in the upper end of last cushion cap.

The upper end surface of the main chord of the small lattice tower crane section is higher than the upper end surface of the main chord of the lattice tower crane section by more than 350 mm.

Preferably: big lattice tower crane festival is including first heel post, fixed disk, bearing pile, the fixed disk is installed in the bottom of first heel post, bearing pile fixed mounting is in the bottom of fixed disk.

Preferably: the outer wall fixedly connected with of first heel post is fixed detaining, the outer wall fixedly connected with of first heel post is fixed pincers.

Preferably: the outer wall of first heel post is fixed you and is connected with the second link, the outer wall fixedly connected with second mount of first heel post.

Preferably: small lattice tower crane festival includes third link, second heel post, connecting block and third mount, connecting block fixed mounting is on the second heel post, third link and connecting block fixed connection, third mount fixed mounting is in the outer wall of second heel post.

Preferably: the connecting mechanism comprises angle steel, channel steel and a square steel pipe, one side face of the channel steel is fixedly connected with the angle steel, and the other side face of the channel steel is fixedly connected with the square steel pipe.

Compared with the prior art, the utility model, following beneficial effect has:

1. through the last cushion cap that sets up, big lattice tower crane festival, little lattice tower crane festival, first link, first mount, the lattice post, coupling mechanism, small-size tower crane and large-scale tower crane can conveniently be changed to fixed block and bored concrete pile, pre-buried nested combination formula tower crane festival in the tower crane foundation, nested combination formula tower crane festival is with the form global design of big lattice festival endotheca little lattice festival, preparation and installation, according to underground and overground part structure hoist and mount requirement, install inboard small-size tower crane in the basement stage, demolish inside small-size tower crane after the basement construction is accomplished, install the large-scale tower crane in the outside, can the perpendicular cost of transportation of effective control, and realize the big or small secondary replacement of tower crane safely.

2. The nested combined tower crane joint can effectively guarantee self stability through the upper bearing platform, the first connecting frame, the first fixing frame, the lattice column, the second connecting frame, the second fixing frame, the third connecting frame, the third fixing frame and the connecting mechanism, is integrally designed and manufactured by a tower crane manufacturer in a mode of sleeving the small lattice joint in the large lattice joint, and is a stable system in a rectangular lattice mode. The oblique web members at the bottom and the four sides of the top of the chord member between the large section and the small section are connected by profile steel, so that the nested combined tower crane section forms a self-stabilizing system. When pre-buried, set up the location steel pipe, the tower crane festival of being convenient for is pre-buried location, guarantees construction quality.

3. The upper bearing platform, the large lattice tower crane section and the small lattice tower crane section are arranged, so that energy can be effectively saved, the nested combined tower crane sections share one concrete bearing platform foundation, the tower crane sections can realize replacement of large and small tower cranes only by being pre-buried once, the construction progress can be accelerated, the cost is reduced, and the better economic benefit is achieved.

Drawings

FIG. 1 is a front sectional view of the present invention;

fig. 2 is a top view of the present invention;

FIG. 3 is a schematic structural view of a large lattice tower crane joint of the present invention;

FIG. 4 is a schematic structural view of a small lattice tower crane joint of the present invention;

fig. 5 is a schematic view of the structure of the connection mechanism of the present invention.

Fig. 6 is a schematic view of the construction process of the present invention.

In the figure: 1. an upper bearing platform; 2. a large lattice tower crane section; 3. a small lattice tower crane section; 4. a first connecting frame; 5. a first fixing frame; 6. a lattice column; 7. a connecting mechanism; 8. a fixed block; 9. filling piles; 201. a second link frame; 202. a fixing buckle; 203. fixing the pliers; 204. a first load-bearing column; 205. fixing the disc; 206. bearing piles; 207. a second fixing frame; 301. a third connecting frame; 302. connecting blocks; 303. a second load-bearing column; 304. a third fixing frame; 701. angle steel; 702. channel steel; 703. and (5) square steel pipes.

Detailed Description

The invention will be further elucidated with reference to the drawings and specific embodiments, it being understood that these examples are intended to illustrate the invention only and are not intended to limit the scope of the invention, and that modifications to the various equivalent forms of the invention, which may occur to those skilled in the art after reading the present invention, fall within the scope of the invention as defined in the claims appended hereto.

The utility model provides a pre-buried nested combination formula tower crane festival device, as shown in fig. 1-5, includes that upper bearing platform 1, big lattice tower crane festival 2, little lattice tower crane festival 3, first link 4, first mount 5, lattice post 6, coupling mechanism 7, fixed block 8 and bored concrete pile 9, wherein:

the lattice column 6 is fixedly connected to the bottom end of the upper bearing platform 1, the outer wall of the lattice column 6 is fixedly connected with the first connecting frame 4, and the outer wall of the first connecting frame 4 is fixedly connected with the first fixing frame 5;

2 fixed mounting of big lattice tower crane festival and the inside of last cushion cap 1, coupling mechanism 7 sets up in the inner wall of big lattice tower crane festival 2, 3 fixed connection of coupling mechanism 7 and little lattice tower crane festival, fixed block 8 is installed in the outer wall of big lattice tower crane festival 2, bored concrete pile 9 is installed in the upper end of last cushion cap 1.

Through the last cushion cap 1 that sets up, big lattice tower crane festival 2, little lattice tower crane festival 3, first link 4, first mount 5, lattice column 6, coupling mechanism 7, small-size tower crane and large-scale tower crane can conveniently be changed to fixed block 8 and bored concrete pile 9, pre-buried nested combination formula tower crane festival in the tower crane foundation, nested combination formula tower crane festival is with the form global design of big lattice section endotheca little lattice section, preparation and installation, according to underground and overground part structure hoist and mount requirement, at the inboard small-size tower crane of basement stage installation, the inside small-size tower crane is demolishd after the basement construction is accomplished, install the large-scale tower crane in the outside, can the perpendicular cost of transportation of effective control, and realize big or small tower crane secondary replacement safely.

Big lattice tower crane festival 2 is including first heel post 204, fixed disk 205, bearing pile 206, fixed disk 205 installs in the bottom of first heel post 204, bearing pile 206 fixed mounting can support whole big lattice tower crane festival 2 in the bottom of fixed disk 205.

The outer wall fixedly connected with of first heel post 204 is detained 202 fixedly, the outer wall fixedly connected with of first heel post 204 is fixed pincers 203, can dock with large-scale tower crane.

The outer wall of first spandrel column 204 is fixed you and is connected with second link 201, the outer wall fixedly connected with second mount 207 of first spandrel column 204 lets the overall structure of big lattice tower crane festival 2 more stable.

Little lattice tower crane festival 3 includes third link 301, second heel post 303, connecting block 302 and third mount 304, connecting block 302 fixed mounting is on second heel post 303, third link 301 and connecting block 302 fixed connection, third mount 304 fixed mounting is in the outer wall of second heel post 303, and the overall structure that lets little lattice tower crane festival 3 is more stable.

The upper end surface of the main chord of the small lattice tower crane section 3 is higher than the upper end surface of the main chord of the lattice tower crane section 2 by more than 350 mm.

The connecting mechanism 7 comprises angle steel 701, channel steel 702 and a square steel pipe 703, one side face of the channel steel 702 is fixedly connected with the angle steel 701, the other side face of the channel steel 702 is fixedly connected with the square steel pipe 703, and the large lattice tower crane section 2 and the small lattice tower crane section 3 can be connected.

When the large-scale tower crane is used, the first connecting frame 4, the first fixing frame 5, the large-scale lattice tower crane section 2, the small-scale lattice tower crane section 3 and the lattice columns 6 are installed in a foundation, then the reinforcing steel bars and the reinforcing steel bars are used for fixing and binding, then cement is injected, layered pouring is carried out, when the small-scale tower crane needs to be installed, the small-scale tower crane needs to be hoisted by a truck crane, the small-scale tower crane and the connecting blocks 302 above the small-scale lattice tower crane section 3 are overlapped, then fixing is carried out, when the large-scale tower crane needs to be installed, the small-scale tower crane needs to be dismantled firstly, then the large-scale tower crane is butted with the fixing clamps 203 on the large-scale lattice tower crane section 2 by the truck crane, and then the large-scale tower crane and the fixing clamps 203 are fixed through the fixing buckles 202.

A construction process of an embedded and nested combined tower crane section device is shown in figure 6 and comprises the following steps:

1. tower crane foundation design

The tower crane foundation adopts a combined tower crane foundation of a steel lattice column and an upper concrete bearing platform and a lower concrete bearing platform, and the bearing capacity of the tower crane foundation is designed according to a large-scale tower crane. The tower crane foundation can be implemented through the rear part through expert demonstration. The concrete parameters of the tower crane foundation are shown in a table 5.2.1-1:

TABLE 5.2.1-1 Tower crane basic parameter Table

2. Design and manufacture of nested combined tower crane section

The nested combined tower crane joint 1 is designed and manufactured integrally by a tower crane manufacturer in a mode that a large lattice joint is sleeved with a small lattice joint.

2, designing a tower crane section: the upright rods of the large-lattice tower crane sections are angle steels, and the width of the angle steels is 1800 x 1800; the small lattice tower crane section upright rod is a square steel pipe, and the width is 1600 × 1600. Eight point locations total are arranged at the bottom and the top of the chord member of the large and small lattice tower crane sections and are in full-welded connection with channel steel, and four point locations total are arranged at the intersection of two tower crane sections and diagonal web members on four sides and are in full-welded connection with angle steel. The upper end surface of the small lattice section main chord is higher than the upper end surface of the large lattice section main chord by more than 350 mm.

3, manufacturing a tower crane section: before the nested combined tower crane section is welded, rust, moisture, oil stain, dust oxide skin, cutting slag and the like on the surface of a welding line are removed; strictly forbidding the arc striking on the parent metal. The appearance of the welding seam should be uniform and compact, and the surface should not have burn, crack, air hole and pit.

3. Tower crane section entrance acceptance check

And (1) after the nested combined tower crane section enters the field, quality inspection and acceptance are required. And after the acceptance is qualified, the product can be put into use. The tower crane has the advantages that the quality guarantee data is saved, and the model and the specification must meet the design requirements. The quality inspection data of the manufacturing process must be complete according to the product qualification certificate of the same product. And (3) checking and accepting the external dimension of the tower crane section: the size deviation of the tower crane section is in accordance with the requirements of the acceptance standard of construction quality of steel structure engineering (GB 50205-2020). The tolerance deviations were performed as per Table 5.2.3-1.

TABLE 5.2.3-1 allowable deviation table (mm) of external dimension of nested combination type tower crane section

2, quality acceptance of the welding seam of the nested combined section: the welding wave on the surface of the welding seam is uniform, the defects of cracks, slag inclusion, welding beading, burn-through, craters, needle-shaped air holes and the like are avoided, and splashing substances are also avoided in the welding area. The appearance standard of the welding line meets the requirement of grade II welding line quality standard in acceptance Standard of construction quality of Steel structures (GB 50205-2020).

4. Tower crane section paying-off positioning

1, firstly, the central cross line of the tower crane is released. And rotating 45 degrees on the basis of the center of the cross line, and discharging the other two cross lines of the base. The dimension lines and other line segments of the base two end points are paid out with the center as a reference.

And 2, marking the cross line of the tower crane joint positioning center by a factory. The center line of the tower crane section is determined by the theodolite, and the positioning elevation of the embedded part is measured on each tower crane section by the level gauge so as to control and adjust the elevations of the four connecting end surfaces of the tower crane section.

5. Tower crane joint installation

And 1, hoisting the tower crane section by adopting a 25-ton truck crane. Four-point hoisting is adopted, and during hoisting, the steel wire rope is directly tied to the upper end of the chord member of the small tower crane inside, so that wrap angles can be made at four corners of the member to protect the member and the steel wire rope so as to prevent the steel wire rope from being worn and broken.

And 2, coinciding the cross line of the tower crane foundation positioning center with the cross center line marked on the support. A500 x 500 steel plate is fixed below each supporting leg position of a tower crane section, 1 positioning steel pipe is welded on each steel plate according to the installation position of the small-lattice tower crane section, the upper opening of each steel pipe is made into a 45-degree groove so as to reduce the friction force between the tower crane section and the positioning steel pipe during hoisting, and the positioning steel pipe is only required to be 1cm higher than the lower surface of the double-lattice tower crane section so as to reduce the probability of collision with the positioning steel pipe when the tower crane section is in place.

6. Leveling and fixing tower crane joint

2 theodolites are erected on two vertical directions of the central line of the tower crane section, the tower crane section is adjusted through the theodolites to be installed and positioned, and the elevation of the tower crane section is measured through a level gauge.

2 adjust tower crane festival landing leg and bed course steel sheet position with the parallels, the horizontal deviation of control tower crane festival is not more than 2mm, and the straightness deviation of remaining perpendicular is not more than 5mm. The tower crane sections are welded and fixed with the steel plates and the sizing blocks, and each tower crane section supporting leg is firmly welded with the upper iron steel bar and the lower iron steel bar through the diagonal draw steel bar.

7. Tower crane bearing platform construction

1 during reinforcement, can suitably adjust the reinforcing bar interval if reinforcing bar and landing leg conflict let the reinforcing bar avoid tower crane festival landing leg, if can't avoid the time-out really should cut conflict reinforcing bar and add the strengthening rib around according to the similar tower crane festival reinforcement method of design change.

And 2, immediately pouring the concrete mixture into a mold after the concrete mixture is conveyed to a pouring place. When the concrete is poured in layers, the thickness of each layer of concrete is controlled within 300 mm. When the concrete is poured, the concrete is uniformly poured around the embedded member as much as possible, and the lateral pressures of the concrete to the member in all directions are offset.

3 use of a plug-in vibrator should be fast-plugging and slow-unplugging. The insertion points are uniformly arranged and moved point by point, the insertion points are sequentially carried out without omission, uniform compaction is realized, the movement distance is not more than 1.5 times (generally 300-400 mm) of the action radius of the vibrating spear, and the insertion of 50mm of the concrete surface of the lower layer is carried out when the upper layer is vibrated so as to eliminate the seam between the two layers. The steel bars at the mutual crossing position of the underground sections are dense, and the HZ6X-30 insertion type vibrator can be used for vibrating instead of an HZ-50 insertion type vibrator. And the steel bars, tower crane sections and the like are avoided as much as possible during vibration. The accurate vibration time of each insertion point is controlled according to the concrete surface level, no obvious settlement, no bubbles and mortar overflow on the surface.

8. Tower crane installation and replacement

1 after the construction of the tower crane foundation is finished, the tower crane must be inspected and accepted by a project manager department, a tower crane manufacturer, a tower crane installation unit and the like, the strength reaches more than 90%, and the tower crane installation can be carried out.

2 after the tower crane foundation construction is completed, firstly installing the small tower crane, and connecting the embedded section, the foundation section and the standard section through the M30 high-strength bolt.

And 3, after the construction of the basement is finished, dismantling the small tower crane, installing the large tower crane, and connecting the embedded section, the foundation section and the standard section of the large tower crane through a phi 55 pin shaft.

4, in the construction of the foundation concrete, settlement and displacement observation points are made at four corners of the top surface of the foundation, and original records are made. The tower crane should be observed and recorded regularly (once a day) after installation, and the settlement and the inclination rate should not exceed the regulation. If the requirements of the tower crane exceed the standard, the tower crane should be immediately stopped to be used, reasons are searched, and the monitoring frequency is encrypted. A level gauge is adopted for settlement monitoring of the foundation bearing platform surface, and a total station is adopted for perpendicularity monitoring of the tower body. The settlement of the foundation bearing platform is not more than 5mm, and the verticality deviation of the tower body is not more than 1/1000 of the height of the tower.

The utility model discloses a pre-buried nested combination formula tower crane festival realizes the replacement of big or small tower crane in the tower crane basis. The type of a large-sized tower crane is determined according to the hoisting requirements of underground and overground part structures, and the foundation of the tower crane is designed according to the load requirements of the large-sized tower crane. The nested combined tower crane joint is designed and manufactured integrally by a tower crane manufacturer in a mode that a large lattice joint is sleeved with a small lattice joint. The large lattice tower crane section vertical rod is an angle steel, the width is 1800 x 1800, the small lattice tower crane section vertical rod is a square steel pipe, and the width is 1600 x 1600. The bottom and the top of the chord member of the large and small latticed tower crane sections are provided with channel steel welded connection (full welding), and the intersection of two tower crane sections and diagonal web members on four sides is provided with angle steel welded connection (full welding), so that the nested combined tower crane sections form a self-stabilizing system.

When the tower crane sections of the tower crane are embedded, the length of the tower crane sections embedded into the foundation is installed according to the specification requirements, the upper end surfaces of the main chord members of the small lattice sections are higher than the upper end surfaces of the main chord members of the large lattice sections by more than 350mm, the large and small tower cranes are guaranteed to be safely replaced, and the large and small tower cranes can be normally installed and used. Firstly, mounting an internal small tower crane, and connecting the embedded section, the foundation section and the standard section through high-strength bolts; and after the basement construction is finished, the small tower crane is dismantled, the external large tower crane is installed, and the embedded section, the foundation section and the standard section of the large tower crane are connected through the pin shaft.

The utility model has the characteristics of it is following:

1. self-stabilizing system: the nested combined tower crane section is designed and manufactured integrally by a tower crane manufacturer in a mode that a small latticed section is sleeved in a large latticed section. The large and small sections are in rectangular lattice form and are stable systems. The inclined web members at the bottom and the top of the chord member between the large section and the small section are connected by profile steel, so that the nested combined tower crane section forms a self-stabilizing system. When pre-buried, set up the location steel pipe, the tower crane festival of being convenient for is pre-buried location, guarantees construction quality.

2. Guarantee convenient and safe replacement of tower crane: the tower crane foundation is designed according to the load requirement of a large tower crane. The width of the large lattice section on the plane is 100mm larger than that of the small lattice section, and the upper end surface of the main chord member of the small lattice section on the vertical surface is higher than that of the main chord member of the large lattice section by more than 350mm, so that the convenience and the safety of large and small tower cranes during replacement are ensured.

3. The economic benefit is good: the nested combined tower crane sections share one concrete bearing platform foundation, and the replacement of large and small tower cranes can be realized only by embedding the tower crane sections once, so that the construction progress can be accelerated, the cost expenditure is reduced, and the nested combined tower crane sections have better economic benefit.

The utility model discloses can conveniently change small-size tower crane and large-scale tower crane, pre-buried nested combination formula tower crane festival in the tower crane foundation, nested combination formula tower crane festival is with the form global design of big lattice festival endotheca little lattice festival, preparation and installation, according to underground and aboveground part structure hoist and mount requirement, at the inboard small-size tower crane of basement stage installation, demolish inside small-size tower crane after the basement construction is accomplished, the large-scale tower crane in the installation outside, can the perpendicular cost of transportation of effective control, and realize the replacement of big or small tower crane secondary of safety, can effectual assurance self-stabilization, nested combination formula tower crane festival is by tower crane producer global design with the form of big lattice festival endotheca little lattice festival, the preparation, it is big, the minor festival is the rectangle lattice form, self is stable system. The oblique web members at the bottom and the four sides of the top of the chord member between the large section and the small section are connected by profile steel, so that the nested combined tower crane section forms a self-stabilizing system. When pre-buried, set up the location steel pipe, the tower crane section of being convenient for is pre-buried the location, guarantees construction quality, can effectual resources are saved, and nested combination formula tower crane section shares a concrete cushion cap basis, and the tower crane section only needs once pre-buried just can realize the replacement of big or small tower crane, can accelerate the construction progress, reduces the cost expenditure, has better economic benefits.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (6)

1. The utility model provides a pre-buried nested combination formula tower crane festival device which characterized in that: including last cushion cap (1), big lattice tower crane festival (2), little lattice tower crane festival (3), first connecting frame (4), first mount (5), lattice post (6), coupling mechanism (7), fixed block (8) and bored concrete pile (9), wherein:

the lattice column (6) is fixedly connected to the bottom end of the upper bearing platform (1), the outer wall of the lattice column (6) is fixedly connected with the first connecting frame (4), and the outer wall of the first connecting frame (4) is fixedly connected with the first fixing frame (5);

the large lattice tower crane joint (2) is fixedly installed in the upper bearing platform (1), the connecting mechanism (7) is arranged on the inner wall of the large lattice tower crane joint (2), the connecting mechanism (7) is fixedly connected with the small lattice tower crane joint (3), the fixing block (8) is installed on the outer wall of the large lattice tower crane joint (2), and the filling pile (9) is installed at the upper end of the upper bearing platform (1);

the upper end face of the main chord of the small lattice tower crane section (3) is higher than the upper end face of the main chord of the lattice tower crane section (2) by more than 350 mm.

2. The embedded and nested combined type tower crane section device according to claim 1, characterized in that: big lattice tower crane festival (2) is including first heel post (204), fixed disk (205), bearing stake (206), the bottom in first heel post (204) is installed in fixed disk (205), bearing stake (206) fixed mounting is in the bottom of fixed disk (205).

3. The embedded and nested combined type tower crane section device according to claim 2, characterized in that: the outer wall of the first bearing column (204) is fixedly connected with a fixing buckle (202), and the outer wall of the first bearing column (204) is fixedly connected with a fixing clamp (203).

4. The embedded and nested combined type tower crane section device according to claim 3, characterized in that: the outer wall of the first bearing column (204) is fixedly connected with a second connecting frame (201), and the outer wall of the first bearing column (204) is fixedly connected with a second fixing frame (207).

5. The embedded and nested combined type tower crane section device according to claim 4, characterized in that: little lattice tower crane festival (3) include third link (301), second heel post (303), connecting block (302) and third mount (304), connecting block (302) fixed mounting is on second heel post (303), third link (301) and connecting block (302) fixed connection, third mount (304) fixed mounting is in the outer wall of second heel post (303).

6. The embedded and nested combined type tower crane section device according to claim 5, characterized in that: the connecting mechanism (7) comprises angle steel (701), channel steel (702) and a square steel pipe (703), one side face of the channel steel (702) is fixedly connected with the angle steel (701), and the other side face of the channel steel (702) is fixedly connected with the square steel pipe (703).

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