Steel trestle foundation truss girder supporting device

Abstract

The utility model relates to a steel trestle foundation truss girder supporting device which comprises a truss type steel pipe pile, a plurality of pile foundations arranged at the bottom of the truss type steel pipe pile and trestle piers fixed to the pile foundations in a pouring mode. The pile foundation comprises an upper pipe pile fixed to the bottom end of the truss type steel pipe pile, a lower pipe pile used for driving the tip end of the lower pipe pile into bare rock, a connecting steel pipe installed between the upper pipe pile and the lower pipe pile and provided with a plurality of adjusting openings, and a lead screw pair arranged in the connecting steel pipe at intervals and installed on the lower pipe pile in a self-rotating mode. And the anchoring parts are hinged to the moving ends of the lead screw pairs, and the moving ends of the anchoring parts penetrate through the adjusting openings in a clearance mode and are fixedly connected to the trestle pier in an inserted mode. By optimizing the pile foundation connecting mode, additionally arranging a reinforcing structure, adopting the adjustable lead screw pair and reasonably designed anchoring parts and the like, the foundation stability, the shear capacity and the installation firmness are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of deep - water bare - rock steel trestle construction, in particular to a steel trestle foundation truss support device. Background Art

[0002] With the development of cities, the construction of super - large bridges across large rivers and bays is increasing day by day. The force on the deep - water bare - rock foundation of the steel trestle has become a rather difficult problem. In order to solve problems such as the unevenness of the steel truss beam foundation of the steel trestle, the difficulty of self - stability of single steel pipe piles, the insecure connection, the weak shear resistance of the steel trestle, and the inclination and deformation of the deep - water bare - rock foundation, through the design of the upper structure of the steel trestle, the layout of stiffeners on the Bailey truss beam and the optimization design of the foundation truss support can be carried out. However, this method has defects such as large deviation in the installation of steel pipe piles, poor foundation stability and stiffness in deep - water bare - rock areas, and insecure installation. Therefore, a suitable foundation truss support device is needed to improve the construction efficiency.

[0003] Chinese Patent with the authorization announcement number CN110409281B discloses a deep - water bare - rock steel trestle, including a trestle and steel pipe piles supporting the trestle. The steel pipe piles are arranged on the trestle piers; the steel pipe piles are provided with tips driven into the bare rock, and a steel cofferdam is arranged around the steel pipe piles. Concrete trestle piers are poured in the steel cofferdam; the section of the steel pipe piles extending into the trestle piers is provided with reinforcing bars protruding from the outer wall of the steel pipe piles; the steel cofferdam is a rectangular box body with an open bottom. The bottoms of the four walls of the steel cofferdam are respectively provided with baffles. The baffles are vertically movable baffles and are also baffles with an inclination angle in the vertical plane; each side wall of the steel cofferdam is provided with two baffle pins, and the baffles are provided with two baffle adjustment holes corresponding to the baffle pins. The baffle adjustment holes are long holes. The two baffle adjustment holes are respectively sleeved on the two baffle pins, so that the baffles can move vertically and generate an inclination angle.

[0004] The above - mentioned prior - art solution has the following defects: The above - mentioned steel pipe piles make the trestle piers and the bare rock at the bottom of the riverbed closely combined through the rheology of the bottom - sealed concrete in the rectangular box. Since the pile tip at the end of the steel pipe pile can slightly enter the rock stratum, under the action of the gravity of the bottom - sealed concrete, a large lateral displacement resistance is formed, and a stable foundation is formed at the bottom of the riverbed. However, since the connection method between the steel pipe piles, the bottom - sealed concrete and the steel cofferdam is relatively simple, mainly relying on the surface adhesion force between the steel pipe piles, the reinforcing bars, the baffles and the bottom - sealed concrete, the strength and stability of this connection method may be challenged in the complex and changeable deep - water bare - rock environment. Especially when encountering extreme natural conditions such as strong currents and earthquakes, the concrete trestle piers and the steel pipe piles are prone to looseness or even damage, thus affecting the safety and stability of the entire steel trestle, and there are problems such as poor foundation stability, weak shear resistance and insecure installation in deep - water bare - rock areas. Summary of the Utility Model

[0005] The problem to be solved by the present utility model is to provide a steel trestle foundation truss beam support device in view of the above deficiencies in the prior art, which has the advantages of improving the foundation stability, having better shear resistance and being firmly installed.

[0006] The above utility model object of the present utility model is achieved by the following technical solutions:

[0007] A steel trestle foundation truss beam support device, including a truss-type steel pipe pile, a plurality of pile foundations arranged at the bottom of the truss-type steel pipe pile, and a trestle pier cast and fixed on the plurality of pile foundations. The pile foundation includes an upper pipe pile fixed to the bottom end of the truss-type steel pipe pile, a lower pipe pile for driving the tip into the bare rock, a connecting steel pipe installed between the upper pipe pile and the lower pipe pile and provided with a plurality of adjustment openings, a lead screw pair arranged in the connecting steel pipe at intervals and rotatably installed on the lower pipe pile, and a plurality of anchor members hinged to the moving end of the lead screw pair. The moving end of the anchor member passes through the adjustment opening at intervals and is inserted and fixed on the trestle pier.

[0008] By adopting the above technical solutions, in the actual use process, through an underwater robot to scan the underwater riverbed or according to the on-site underwater lifting equipment and construction conditions, it is determined to accurately measure the underwater topography by the steel pipe sounding method, draw a deep-water bare rock operation planning diagram, and import it into the positioning system. When the bedrock surface is inclined or uneven, in order to ensure that the support device can fit the riverbed surface to the greatest extent after being lowered, the bottom of the support device is made into a trestle pier corresponding to the rock surface, and the pile driving is carried out by hammering to ensure that the single-pile hammering bearing capacity of each steel pipe pile meets the design requirements. The truss-type steel pipe pile is supplemented with stiffening plates arranged inside the truss to optimize the support design and increase the shear deformation resistance of the support device; at the same time, the upper pipe pile, the connecting steel pipe and the lower pipe pile are length-matched according to the lowering depth and the actual situation of the rock surface. After the trestle pier is cast by a mold, under the limiting action of the adjustment opening, the anchor member realizes the lifting of its moving end by rotating the lead screw pair, and then can realize the umbrella-shaped expansion and contraction of the anchor member at the adjustment opening, so as to drive the anchor member to be inserted into the cast concrete, and force part of the concrete to enter the inside of the connecting steel pipe through the adjustment opening to strengthen the installation firmness. Thus, the support device is erected on the deep-sea bare rock, and the pile foundation and the trestle pier complete the fixation on the bare rock, and the truss-type steel pipe pile completes the support of the upper trestle structure, significantly improving the foundation stability, shear resistance and installation firmness.

[0009] The present utility model is further provided that: the outer surface of the trestle pier is set as a stepped surface.

[0010] By adopting the above technical solutions, the design of the stepped surface not only provides a more stable attachment surface for concrete pouring during the construction process, reducing the risk of concrete slipping, but also increases the contact area between the trestle pier and the surrounding environment, further enhancing the stability of the entire support device; during the hardening process of the concrete, the stepped surface can form multiple occluding points, enhancing the bonding force between the concrete and the steel structure and effectively resisting the destructive effects of external factors such as water flow scouring and seismic fluctuations on the structure.

[0011] The present utility model is further configured such that: the connecting steel pipe is a double-flange steel pipe, flange plates are respectively provided at the ends of the upper pipe pile and the lower pipe pile, and the flange plates are fixedly connected to the flanges at the ends of the connecting steel pipe through fasteners.

[0012] By adopting the above technical solutions, the upper pipe pile and the lower pipe pile are tightly connected through a high-strength double-flange connecting steel pipe, ensuring their stability; the densely distributed bolt holes on the flange plates, in cooperation with high-quality fasteners such as bolts and nuts, achieve the close fitting and high-strength connection between the flanges, effectively resisting the complex stress effects from the deep-water bare rock area.

[0013] The present utility model is further configured such that: reinforcing rings are respectively provided at the ends of the upper pipe pile and the lower pipe pile, and a plurality of reinforcing ribs are provided between the reinforcing rings and the flange plates, and the diameter of the reinforcing rings is smaller than the diameter of the flange plates, so that the structure formed by connecting the reinforcing rings, the flange plates and the plurality of reinforcing ribs is in a convex platform shape.

[0014] By adopting the above technical solutions, reinforcing rings and a plurality of reinforcing ribs are respectively added at the ends of the upper pipe pile and the lower pipe pile. These structures not only increase the local stiffness of the pile body, but also optimize the force transmission path through their convex platform shape design, enabling the entire support device to more evenly disperse stress when subjected to external forces, improving the stability and safety of the overall structure.

[0015] The present utility model is further configured such that: the lead screw pair includes a lead screw shaft rotatably installed on the lower pipe pile and a transmission nut threadedly connected to the lead screw shaft, and the anchor is hinged to the surface of the transmission nut.

[0016] By adopting the above technical solutions, the design of the lead screw pair further enhances the adjustability and adaptability of the support device. When it is necessary to adjust the protruding length of the anchor, on the basis of roughly limiting through the adjustment opening, only by rotating the lead screw shaft, the transmission nut can be driven to move up and down along the lead screw shaft, and then the oblique telescopic movement of the anchor can be realized. This design greatly simplifies the installation and adjustment process and improves the construction efficiency.

[0017] The present utility model is further configured such that: a hexagonal sleeve is provided at the top end of the lead screw shaft, and a hexagonal limit hole adapted to be fitted with the hexagonal sleeve is formed at the bottom end of the upper pipe pile.

[0018] By adopting the above technical solution, the hexagonal sleeve provided at the top end of the lead screw shaft is fitted with the hexagonal limit hole at the bottom end of the upper pipe pile, which not only ensures the precise positioning of the lead screw pair in the vertical direction but also facilitates installation and disassembly.

[0019] The present utility model is further configured such that: a positioning block is rotatably connected to the bottom end of the lead screw shaft, and a hexagonal positioning hole adapted to be fitted with the positioning block is formed at the top end of the lower pipe pile.

[0020] By adopting the above technical solution, the combination of the positioning block at the bottom end of the lead screw shaft and the hexagonal positioning hole at the top end of the lower pipe pile ensures that the lead screw pair will not deviate from the predetermined axis during rotation, thereby achieving precise control of the protruding length of the anchor.

[0021] The present utility model is further configured such that: the anchor is provided as a U-shaped anchor ring, and the adjustment opening is provided as a strip-shaped opening in clearance fit with the U-shaped anchor ring.

[0022] By adopting the above technical solution, the anchor is in the form of a U-shaped anchor ring, and its movable end passes through the strip-shaped adjustment opening on the connecting steel pipe by means of clearance fit and is inserted and fixed on the trestle pier; this design not only ensures the stability of the anchor in the horizontal direction but also allows it to be finely adjusted within a certain range to meet the requirements of different terrains and working conditions; under extreme natural conditions, such as strong water flow or earthquake, the firm connection between the U-shaped anchor ring and the trestle pier can effectively resist external impacts, prevent the support device from loosening or being damaged, and ensure the overall safety and stability of the steel trestle.

[0023] In summary, the beneficial technical effects of the present utility model are as follows: by optimizing the pile foundation connection method, adding a strengthening structure, adopting an adjustable lead screw pair, and designing a reasonable anchor, the foundation stability, shear resistance, and installation firmness are significantly improved. This support device is not only applicable to the construction of super-large bridges in deep-water bare rock areas but also can be popularized and applied under other complex geological conditions, providing a strong guarantee for the safe construction of bridge projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural view of the steel trestle foundation truss beam support device of the present utility model.

[0025] Figure 2 is a schematic view of the use state of the steel trestle foundation truss beam support device of the present utility model.

[0026] Figure 3 is a three-dimensional structural view of the pile foundation of the present utility model.

[0027] Figure 4 It is a schematic diagram of the explosion structure of the pile foundation of the present utility model.

[0028] Figure 5 It is a bearing capacity test diagram of the steel trestle of the present utility model.

[0029] In the figure, 1. Truss-type steel pipe pile; 2. Pile foundation; 21. Upper pipe pile; 211. Hexagonal limit hole; 22. Lower pipe pile; 221. Hexagonal positioning hole; 23. Connecting steel pipe; 231. Adjusting port; 24. Lead screw pair; 241. Lead screw shaft; 242. Transmission nut; 243. Hexagonal sleeve; 244. Positioning block; 25. Anchor; 26. Flange; 27. Reinforcing ring; 28. Reinforcing rib; 3. Trestle pier. Specific embodiments

[0030] In order to make the technical means, creative features, achieved purposes and functions realized by the present utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Refer to Figure 1 , a steel trestle foundation truss beam support device disclosed by the present utility model, comprising a truss-type steel pipe pile 1, four pile foundations 2 arranged at the bottom of the truss-type steel pipe pile 1, and a trestle pier 3 cast and fixed on the four pile foundations 2. Among them, the outer surface of the trestle pier 3 is set as a stepped surface, and the pile foundation 2 includes an upper pipe pile 21 fixed at the bottom end of the truss-type steel pipe pile 1, a lower pipe pile 22 for driving the tip into the bare rock, a connecting steel pipe 23 installed between the upper pipe pile 21 and the lower pipe pile 22 and provided with a plurality of adjusting ports 231, a lead screw pair 24 arranged at intervals in the connecting steel pipe 23 and rotatably installed on the lower pipe pile 22, and a plurality of anchors 25 hinged to the moving end of the lead screw pair 24. The adjusting ports 231 and the anchors 25 are arranged in one-to-one correspondence, and the moving end of the anchor 25 passes through the adjusting port 231 at intervals and is inserted and fixed on the trestle pier 3.

[0032] Refer to Figure 2, during actual use, the underwater terrain is accurately measured by the steel pipe sounding method through the scanning of the underwater riverbed by an underwater robot or according to the on-site underwater lifting equipment and construction conditions, and a deep-water bare rock operation planning map is drawn and imported into the positioning system. When the bedrock surface is inclined or uneven, to ensure that the support device can fit the riverbed surface to the greatest extent after being lowered, the bottom of the support device is made into a stack bridge pier 3 corresponding to the rock surface, and the pile driving is carried out by hammering to ensure that the single-pile hammering bearing capacity of each steel pipe pile meets the design requirements. The truss-type steel pipe pile 1 is supplemented with stiffening steel plates arranged inside the truss to optimize the design of the support and increase the shear deformation resistance of the support device; at the same time, the upper pipe pile 21, the connecting steel pipe 23 and the lower pipe pile 22 are length-matched according to the lowering depth and the actual situation of the rock surface. After the stack bridge pier 3 is cast by a mold, under the limiting action of the adjusting port 231, the anchor 25 realizes the lifting of its moving end by rotating the screw pair 24, and then the umbrella-shaped expansion of the anchor 25 at the adjusting port 231 can be realized, so as to drive the anchor 25 to be inserted into the cast concrete, and force part of the concrete to enter the inside of the connecting steel pipe 23 through the adjusting port 231 to strengthen the installation firmness. Thus, the support device is erected on the deep-sea bare rock, and the fixation on the bare rock is completed by the pile foundation 2 and the stack bridge pier 3, and the support of the upper trestle structure is completed by the truss-type steel pipe pile 1, significantly improving the foundation stability, shear resistance and installation firmness.

[0033] Refer to Figure 3 , to realize the detachable installation of the connecting steel pipe 23 between the upper pipe pile 21 and the lower pipe pile 22, the connecting steel pipe 23 is set as a double-flange steel pipe, and flange plates 26 are respectively arranged at the ends of the upper pipe pile 21 and the lower pipe pile 22. The flange plates 26 and the flanges at the ends of the connecting steel pipe 23 are connected and fixed by fasteners (not shown in the figure). The upper pipe pile 21 and the lower pipe pile 22 are tightly connected by the high-strength double-flange connecting steel pipe 23 to ensure their stability; the bolt holes densely distributed on the flange plates 26, in cooperation with high-quality fasteners such as bolts and nuts, realize the tight fit and high-strength connection between the flanges, effectively resisting the complex stress action from the deep-water bare rock area.

[0034] In addition, reinforcing rings 27 are respectively arranged at the ends of the upper pipe pile 21 and the lower pipe pile 22, and a plurality of reinforcing ribs 28 are arranged between the reinforcing rings 27 and the flange plates 26. The diameter of the reinforcing ring 27 is smaller than the diameter of the flange plate 26, so that the structure formed by connecting the reinforcing ring 27, the flange plate 26 and the plurality of reinforcing ribs 28 is in a boss shape. Reinforcing rings 27 and a plurality of reinforcing ribs 28 are respectively added at the ends of the upper pipe pile 21 and the lower pipe pile 22. These structures not only increase the local stiffness of the pile body, but also optimize the force transmission path through their boss-shaped design, enabling the entire support device to more evenly disperse stress when subjected to external forces, and improving the stability and safety of the overall structure.

[0035] Refer toFigure 4 The design of the lead screw pair 24 further enhances the adjustability and adaptability of the support device. The lead screw pair 24 includes a lead screw shaft 241, a transmission nut 242 threadedly connected to the lead screw shaft 241, a hexagonal sleeve 243 provided at the top end of the lead screw shaft 241, and a positioning block 244 provided at the bottom end of the lead screw shaft 241. Among them, the anchor 25 is hinged to the surface of the transmission nut 242. A hexagonal limit hole 211 adapted to be fitted with the hexagonal sleeve 243 is provided at the bottom end of the upper pipe pile 21, and a hexagonal positioning hole 221 adapted to be fitted with the positioning block 244 is provided at the top end of the lower pipe pile 22. When it is necessary to adjust the protruding length of the anchor 25, on the basis of roughly limiting through the adjustment port 231, only by rotating the lead screw shaft 241 can the transmission nut 242 be driven to move up and down along the lead screw shaft 241, thereby realizing the oblique expansion and contraction of the anchor 25. This design greatly simplifies the installation and adjustment process and improves the construction efficiency. At the same time, the hexagonal sleeve 243 provided at the top end of the lead screw shaft 241 is fitted with the hexagonal limit hole 211 at the bottom end of the upper pipe pile 21, which not only ensures the precise positioning of the lead screw pair 24 in the vertical direction but also facilitates installation and disassembly. In addition, the combination of the positioning block 244 at the bottom end of the lead screw shaft 241 and the hexagonal positioning hole 221 at the top end of the lower pipe pile 22 ensures that the lead screw pair 24 will not deviate from the predetermined axis during rotation, thereby realizing the precise control of the protruding length of the anchor 25.

[0036] The anchor 25 is set as a U-shaped anchor ring, and the adjustment port 231 is set as a strip-shaped port in clearance fit with the U-shaped anchor ring. The anchor 25 is in the form of a U-shaped anchor ring, and its movable end passes through the strip-shaped adjustment port 231 on the connecting steel pipe 23 by means of clearance fit and is inserted and fixed on the trestle pier 3; this design not only ensures the stability of the anchor 25 in the horizontal direction but also allows it to be finely adjusted within a certain range to meet the requirements of different terrains and working conditions; under extreme natural conditions, such as strong water flow or earthquake, the firm connection between the U-shaped anchor ring and the trestle pier 3 can effectively resist external impacts, prevent the support device from loosening or being damaged, and ensure the overall safety and stability of the steel trestle.

[0037] Refer to Figure 5 After using the above support device, the steel trestle is optimized by 3D software and the bearing capacity is calculated by Midas software. The driving speed, load capacity, and anti-deformation coefficient of the trestle have been significantly improved. It can be seen from this that before the support device was installed, the steel trestle had problems such as large potential safety hazards, settlement deformation data not meeting the requirements, insecure installation, and weak anti-overturning ability. Now, through self-developed support devices, which have the advantages of good stability, while improving the bearing capacity, the cost is reduced, the stability is enhanced, and the construction quality is guaranteed.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A steel trestle foundation truss support device, comprising a truss steel pipe pile (1), a plurality of pile foundations (2) arranged at the bottom of the truss steel pipe pile (1), and a trestle pier (3) cast and fixed on the plurality of pile foundations (2), characterized in that: The pile foundation (2) comprises an upper pipe pile (21) fixed to the bottom end of the truss-type steel pipe pile (1), a lower pipe pile (22) for driving the tip into bare rock, a connecting steel pipe (23) installed between the upper pipe pile (21) and the lower pipe pile (22) and having a plurality of adjustment openings (231), a lead screw pair (24) arranged in a gap in the connecting steel pipe (23) and installed on the lower pipe pile (22) so as to be rotatable, and a plurality of anchors (25) hinged to the movable end of the lead screw pair (24), wherein the movable end of the anchor (25) passes through the adjustment opening (231) in a gap and is plugged and fixed on the pier (3).

2. A steel trestle foundation truss support device according to claim 1, characterized in that: The outer surface of the pier (3) is arranged as a stepped surface.

3. A steel trestle foundation truss support device according to claim 1, characterized in that: The connecting steel pipe (23) is configured as a double-flange steel pipe, and flanges (26) are respectively provided at the ends of the upper pipe pile (21) and the lower pipe pile (22), and the flanges (26) are connected and fixed to the flanges at the ends of the connecting steel pipe (23) by fasteners.

4. A steel trestle foundation truss support device according to claim 3, characterized in that: The ends of the upper pipe pile (21) and the lower pipe pile (22) are respectively provided with a reinforcement ring (27) and a plurality of reinforcement ribs (28) arranged between the reinforcement ring (27) and the flange (26); the diameter of the reinforcement ring (27) is smaller than the diameter of the flange (26), so that the structure formed by connecting the reinforcement ring (27), the flange (26) and the plurality of reinforcement ribs (28) is in the shape of a boss.

5. The steel trestle foundation truss support device according to claim 1, characterized in that: The screw pair (24) comprises a screw shaft (241) rotatably mounted on the lower pipe pile (22), and a transmission nut (242) threadedly connected to the screw shaft (241), and the anchor (25) is hinged to the surface of the transmission nut (242).

6. A steel trestle foundation truss support device according to claim 5, characterized in that: The top end of the screw shaft (241) is provided with a hexagonal sleeve (243), and the bottom end of the upper pipe pile (21) is provided with a hexagonal limiting hole (211) which is engaged with the hexagonal sleeve (243).

7. A steel trestle foundation truss support device according to claim 5, characterized in that: The bottom end of the screw shaft (241) is rotatably connected to a positioning block (244), and the top end of the lower pipe pile (22) is provided with a hexagonal positioning hole (221) that is engaged with the positioning block (244).

8. The steel trestle foundation truss support device according to claim 1, characterized in that: The anchoring piece (25) is configured as a U-shaped anchor ring, and the adjustment opening (231) is configured as a strip-shaped opening that is clearance-matched with the U-shaped anchor ring.

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