Overhanging tower crane foundation structure

Abstract

The utility model provides a kind of cantilever type tower crane foundation structure.The cantilever type tower crane foundation structure includes cantilever platform, be located on the cantilever platform on tower crane foundation, connect multiple first steel pipe piles and multiple second steel pipe piles in the lower end of the cantilever platform, multiple first steel pipe piles and multiple second steel pipe piles are in the length direction X of the two ends of being separately arranged in cantilever platform;The lower end of the second steel pipe pile is filled with concrete, the concrete is pre-buried with vertically upward extending pull rod, the top of the pull rod is fixed above the cantilever platform;Sand is filled in the first steel pipe pile, the cantilever platform extends horizontally from first steel pipe pile to outside, and the tower crane foundation is arranged on the upper end of the cantilever platform outside.The utility model can stably support tower crane foundation on riverbed, and is suitable for soft soil, rock stratum and complex geological conditions involving water.

Description

Technical Field

[0001] This utility model relates to the field of building and bridge construction technology, and in particular to a cantilevered tower crane foundation structure. Background Technology

[0002] Traditional tower crane foundations mostly use cast-in-place concrete piles, which have problems such as long construction periods, large land occupation, and high costs. Especially in narrow spaces (such as dense urban areas or waterfront areas), traditional foundation structures are difficult to meet the needs of tower crane installation.

[0003] For example, a cantilevered tower crane foundation structure disclosed in existing patent publication number CN222375487U involves a cantilever beam installed on a pier, with a diagonal brace connecting the cantilever beam and the pier. The tower crane foundation is installed on the upper end of the cantilever beam. This structure is only suitable for tower cranes erected on piers and is not applicable to tower cranes used on riverbeds. Utility Model Content

[0004] The purpose of this invention is to provide a cantilevered tower crane foundation structure that can be used on a riverbed.

[0005] The technical solution of this utility model is: a cantilevered tower crane foundation structure, including a cantilevered platform, a tower crane foundation disposed on the cantilevered platform, and multiple first steel pipe piles and multiple second steel pipe piles connected to the lower end of the cantilevered platform. The multiple first steel pipe piles and multiple second steel pipe piles are respectively disposed at both ends of the cantilevered platform in the length direction X. The lower end of the second steel pipe piles is filled with concrete, and a vertically upward extending tie rod is pre-embedded in the concrete. The top of the tie rod is fixed above the cantilevered platform. The first steel pipe piles are filled with sand. The cantilevered platform extends horizontally from the first steel pipe piles to the outside, and the tower crane foundation is disposed at the upper end of the outer cantilevered platform.

[0006] In the above scheme, by setting up steel pipe piles and filling the steel pipe piles on the side closer to the tower crane foundation with sand, and filling the steel pipe piles on the side farther away from the tower crane foundation with concrete and tie rods that connect the concrete to the cantilever platform, the tower crane foundation can be stably supported on the riverbed. This scheme is suitable for soft soil, rock strata and complex geological conditions involving water.

[0007] Preferably, an anchor plate and a nut are connected to the end of the tie rod that extends into the concrete, and an anchor plate and a nut are connected to the end of the tie rod above the cantilever platform.

[0008] Preferably, an anchor beam is provided above the second steel pipe pile, the anchor beam is connected to the upper end of the cantilever platform along the width direction Y, and the tie rod is fixed after passing through the anchor beam.

[0009] Preferably, both the first and second steel pipe piles are provided with a pile top steel plate, and the cantilever platform is placed on the pile top steel plate and fixed with bolts.

[0010] Preferably, the top steel plate of the first steel pipe pile extends horizontally to the outside of the first steel pipe pile, and the top steel plate of the second steel pipe pile extends horizontally to the outside of the second steel pipe pile; multiple connecting plates are connected between the first steel pipe pile and the top steel plate, and between the second steel pipe pile and the top steel plate.

[0011] Preferably, the first steel pipe pile is connected to the cantilever platform by a diagonal brace, and the cantilever platform, the tower crane foundation and the diagonal brace are vertically connected by a bolt.

[0012] Preferably, the screw is a double-ended screw, the upper end of which is fixed to the tower crane foundation by a nut, and the lower end is fixed to the diagonal brace by a wedge block and a nut. A safety pin is inserted into the lower end of the screw, the safety pin abuts against the lower surface of the nut, and the wedge block abuts against the diagonal brace.

[0013] Preferably, the cantilever platform includes at least two steel beams spaced apart in the width direction Y, and a steel beam connection system connecting each pair of adjacent steel beams, the steel beam connection system being located near the tower crane foundation.

[0014] Preferably, the steel beam is an I-beam, with multiple stiffening plates connecting its web and flanges, the stiffening plates being positioned close to the first and second steel pipe piles respectively.

[0015] Preferably, multiple pile connection systems are used to connect the multiple first steel pipe piles and the multiple second steel pipe piles.

[0016] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0017] I. This utility model, by setting up steel pipe piles and filling the steel pipe piles on the side closer to the tower crane foundation with sand, and filling the steel pipe piles on the side farther away from the tower crane foundation with concrete and tie rods connecting the concrete to the cantilever platform, can stably support the tower crane foundation on the riverbed. It is suitable for soft soil, rock strata and complex geological conditions involving water.

[0018] Second, this utility model sets a tie rod inside the steel pipe pile, which can distribute part of the vertical force of the cantilever platform and improve the overturning resistance performance of the cantilever tower crane foundation.

[0019] Third, this utility model sets up diagonal bracing between the cantilever platform and the steel pipe pile, which can decompose and transfer part of the vertical force on the cantilever end of the cantilever platform to the steel pipe pile, forming a stable triangular support structure. Attached Figure Description

[0020] Figure 1A schematic diagram of the cantilevered tower crane foundation structure provided by this utility model;

[0021] Figure 2 for Figure 1 The diagram on the left;

[0022] Figure 3 for Figure 1 The diagram on the right;

[0023] Figure 4 for Figure 1 Top view;

[0024] Figure 5 This is a detailed enlarged schematic diagram of the cantilever end of the cantilever platform.

[0025] In the attached diagram: 1. First steel pipe pile; 2. Tie rod; 3. Concrete; 4. Sand; 5. Pile connection system; 6. Anchor plate; 7. Nut; 8. Bracing plate; 9. Pile top steel plate; 10. Bolt; 11. Steel beam; 12. Diagonal brace; 13. Connecting steel plate; 14. Screw rod; 15. Wedge block; 16. Steel beam connection system; 17. Steel pad plate; 18. Tower crane foundation; 19. Stiffening plate; 20. Anchor beam; 21. Cantilever platform; 22. Second steel pipe pile. Detailed Implementation

[0026] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0027] like Figure 1 As shown, this embodiment provides a cantilevered tower crane foundation structure including a cantilevered platform 21, a tower crane foundation 18 disposed on the cantilevered platform 21, and two first steel pipe piles 1 and two second steel pipe piles 22 connected to the lower end of the cantilevered platform 21. The first steel pipe piles 1 are disposed at one end of the cantilevered platform 21 in the length direction X (close to the tower crane foundation 18) and are spaced apart in the width direction Y. The second steel pipe piles 22 are disposed at the other end of the cantilevered platform 21 in the length direction (away from the tower crane foundation 18) and are spaced apart in the width direction Y.

[0028] The first steel pipe pile 1 and the second steel pipe pile 22 are both made of Q235B grade steel. The positions of the four steel pipe piles (including two first steel pipe piles 1 and two second steel pipe piles 22) are arranged according to the spacing of the tower crane foundation 18. The depth of the steel pipe piles driven into the riverbed is determined based on the site geological conditions and calculations. One end of the cantilever platform 21 is connected to the first steel pipe pile 1 and the second steel pipe pile 22, and the other end extends outwards, with the tower crane foundation 18 installed at the upper end of the cantilever. The cantilever length of the cantilever platform 21 needs to be determined based on the site space.

[0029] like Figure 4 As shown, the cantilever platform 21 includes two steel beams 11 spaced apart in the width direction Y and a steel beam connecting system 16 connected between the two steel beams 11 by welding. The steel beam connecting system 16 is located near the tower crane foundation 18 (e.g., Figure 1 (As shown). The cantilever platform 21 can be a prefabricated structure, assembled, welded, drilled, and surface-treated for corrosion protection in the factory, and then assembled on site. The steel beams 11 and the steel beam connection system 16 should be confirmed by finite element stress analysis based on parameters such as the model and weight of the tower crane to be installed, to determine their steel material and specifications. Figure 1 The steel beam 11 is an I-beam, with multiple stiffening plates 19 connecting its web and flanges. These stiffening plates 19 are respectively positioned close to the first steel pipe pile 1 and the second steel pipe pile 22. The steel beam connection system 16 can be made of I-beams or channel steel.

[0030] like Figure 1 , Figure 2 As shown, the lower end of the second steel pipe pile 22 is filled with concrete 3. Vertically upward-extending tie rods 2 are pre-embedded in the concrete 3. During construction, the tie rods 2 are installed using a pre-embedded method and then poured into the concrete 3 to form a unified structure. The grade of the concrete 3 is not less than C30, and the pouring depth of the concrete 3 needs to be determined by calculation. A set of anchor plates 6 and nuts 7 are connected to the end of the tie rod 2 that extends into the concrete 3. Both the first steel pipe pile 1 and the second steel pipe pile 22 are equipped with a pile top steel plate 9. The thickness of the pile top steel plate 9 is generally 20mm. The cantilever platform 21 is placed on the pile top steel plate 9 and fixed by bolts 10. The bolts 10 are high-strength bolts. An anchor beam 20 is connected between the upper ends of the two steel beams 11. The anchor beam 20 coincides with the pile position of the second steel pipe pile 22. The anchor beam 20 can be made of I-beams or channel steel. The vertically extending tie rod 2 passes through the steel beam 11 and the anchor beam 20, and is then fixed in sequence by another set of anchor plates 6 and nuts 7, thus forming a whole that can share part of the vertical force on the cantilever end of the cantilever platform. The tie rod 2 is made of precision-rolled threaded steel, and its model needs to be determined by calculation. Its installation must be vertical to improve the bearing capacity of the second steel pipe pile 22 at the stress node.

[0031] like Figure 1 , Figure 3As shown, the first steel pipe pile 1 is filled with sand 4, which can improve the bearing capacity of the first steel pipe pile 1 at the stress node. The cantilever platform 21 extends horizontally from the first steel pipe pile 1 to the outside, and the tower crane foundation 18 is set at the upper end of the cantilever platform 21 on the outside.

[0032] The pile top steel plate 9 extends horizontally to the outside of the corresponding connected steel pipe pile, and multiple connecting plates 8 connect the steel pipe pile and the pile top steel plate 9. Multiple inter-pile connection systems 5 connect the first steel pipe pile 1 and the second steel pipe pile 22. For example... Figures 1-4 As shown, the pile connection system 5 is horizontally connected in the X and Y directions, and also diagonally connected.

[0033] like Figure 1 , Figure 5 As shown, a diagonal brace 12 connects the first steel pipe pile 1 to the cantilever platform 21. A connecting steel plate 13 connects the diagonal brace 12 to the first steel pipe pile 1. A bolt 14 vertically connects the cantilever platform 21, the tower crane foundation 18, and the diagonal brace 12. The bolt 14 is a high-strength bolt, a double-ended bolt. Its upper end is fixed to the steel beam 11 and the tower crane foundation 18 by a steel pad 17 and a nut. The lower end of the bolt 14, located on the diagonal brace 12, is fixed to the diagonal brace 12 by a wedge block 15 and a nut. The wedge block 15 abuts against the diagonal brace 12. The lower end of the bolt 14, not located at the diagonal brace 12, is fixed to the steel beam 11 by a steel pad 17 and a nut. A safety pin is inserted into the lower end of the bolt 14, which abuts against the lower surface of the nut to prevent the nut from falling off.

[0034] The construction method for the cantilevered tower crane foundation structure provided by this utility model includes the following steps:

[0035] S1, four spiral steel pipe piles with a diameter of 800mm (including the first steel pipe pile 1 and the second steel pipe pile 22) are arranged in a rectangle with a spacing of 3000×1440mm between the piles. When entering the rock, an impact drill is used to guide the hole. The first steel pipe pile 1 and the second steel pipe pile 22 also serve as casings. The depth of each steel pipe pile into the riverbed is not less than 8m.

[0036] S2, remove the sediment inside each steel pipe pile, install A32 precision rolled threaded steel tie rod 2 inside the second steel pipe pile 22, the verticality deviation of the tie rod 2 installation is less than 1% of the tie rod length, and install anchor plate 6 and nut 7 at the lower end of tie rod 2;

[0037] S3, pour C30 underwater concrete 3 into the second steel pipe pile 22, with a pouring height of 5m, and pour sand 4 into the first steel pipe pile 1 up to the top of the pile.

[0038] S4. Weld a 20mm thick pile top steel plate 9 to the top of each steel pipe pile. Weld a gusset plate 8 every 10cm around the steel pipe pile. Open four bolt holes with a diameter of 20mm and a tie rod hole with a diameter of 40mm on the pile top steel plate 9.

[0039] S5, cantilever platform 21 is prefabricated in the factory. The platform steel beam 11 adopts a three-section I45a, and the steel beam connection system 16 adopts I20a, which is temporarily fixed to the pile top steel plate 9 by M16 high-strength bolts 10;

[0040] S6, use a jack to tension the tie rod 2 to 150KN, install the anchor plate 6 on the upper end of the tie rod 2, and then anchor it to the anchor beam 20 with a nut 7;

[0041] S7, the diagonal brace 12 of the I-beam 45a is fully welded to the steel beam 11 and the first steel pipe pile 1, and the steel plate 13 is used to reinforce the node;

[0042] S8. Install the tower crane foundation section, adjust the wedge block 15, ensure that the verticality deviation of the tower base screw 14 is less than 1%, and tighten the nut to complete the fixing.

[0043] This utility model, through the use of precision-rolled threaded steel tie rods and diagonal braces, makes it more feasible to prevent overturning of cantilever tower crane foundations in limited spaces. Furthermore, the modular tower crane foundation structure is easy to install and disassemble, can be reused, and saves costs.

[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A cantilevered tower foundation structure comprising a cantilevered platform (21) and a tower foundation (18) arranged on the cantilevered platform (21), characterized in that, It also includes multiple first steel pipe piles (1) and multiple second steel pipe piles (22) connected to the lower end of the cantilever platform (21), the multiple first steel pipe piles (1) and multiple second steel pipe piles (22) being respectively located at both ends of the length direction X of the cantilever platform (21); the lower end of the second steel pipe pile (22) is filled with concrete (3), and a vertically upward extending tie rod (2) is pre-embedded in the concrete (3), the top of the tie rod (2) being fixed above the cantilever platform (21); the first steel pipe pile (1) is filled with sand (4), the cantilever platform (21) extends horizontally from the first steel pipe pile (1) to the outside, and the tower crane foundation (18) is set at the upper end of the cantilever platform (21) on the outside.

2. The overhung tower foundation structure according to claim 1, characterized in that, An anchor plate (6) and a nut (7) are connected to the end of the tie rod (2) that extends into the concrete (3), and the anchor plate (6) and the nut (7) are connected to the end of the tie rod (2) above the cantilever platform (21).

3. The overhanging tower foundation structure according to claim 1, characterized in that, An anchor beam (20) is provided above the second steel pipe pile (22). The anchor beam (20) is connected to the upper end of the cantilever platform (21) along the width direction Y. The tie rod (2) passes through the anchor beam (20) and is fixed.

4. The overhanging tower foundation structure according to claim 1, characterized in that, The top of the first steel pipe pile (1) and the second steel pipe pile (22) are both provided with pile top steel plates (9), and the cantilever platform (21) is placed on the pile top steel plates (9) and fixed by bolts (10).

5. The overhanging tower foundation structure according to claim 4, characterized in that The top steel plate (9) on the first steel pipe pile (1) extends horizontally to the outside of the first steel pipe pile (1), and the top steel plate (9) on the second steel pipe pile (22) extends horizontally to the outside of the second steel pipe pile (22); multiple connecting plates (8) are connected between the first steel pipe pile (1) and the top steel plate (9), and between the second steel pipe pile (22) and the top steel plate (9).

6. The overhung tower foundation structure according to claim 1, wherein A diagonal brace (12) is connected between the first steel pipe pile (1) and the cantilever platform (21), and a screw rod (14) is vertically connected between the cantilever platform (21), the tower crane foundation (18) and the diagonal brace (12).

7. The overhung tower base structure according to claim 6, characterized in that The screw (14) is a double-ended screw. Its upper end is fixed to the tower crane foundation (18) by a nut, and its lower end is fixed to the diagonal brace (12) by a wedge block (15) and a nut. A safety pin is inserted into the lower end of the screw (14). The safety pin abuts against the lower surface of the nut. The wedge block (15) abuts against the diagonal brace (12).

8. The overhung tower foundation structure of claim 1, wherein, The cantilever platform (21) includes at least two steel beams (11) spaced apart in the width direction Y, and a steel beam connection system (16) connecting each two adjacent steel beams (11), the steel beam connection system (16) being located near the tower crane foundation (18).

9. The overhanging tower base structure according to claim 8, characterized in that, The steel beam (11) is an I-beam, and multiple stiffening plates (19) are connected between its web and flange. The stiffening plates (19) are respectively located close to the first steel pipe pile (1) and the second steel pipe pile (22).

10. The cantilevered tower crane foundation structure according to claim 1, characterized in that, Multiple pile connection systems (5) connect multiple first steel pipe piles (1) and multiple second steel pipe piles (22).

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