Fabricated bearing platform suitable for transmission tower pile foundation in soft soil area and construction method of fabricated bearing platform

Abstract

The invention discloses a fabricated bearing platform suitable for a transmission tower pile foundation in a soft soil area and a construction method of the fabricated bearing platform. The fabricated bearing platform comprises a prefabricated bearing platform body and a grouting steel pipe. An electric pole tower is arranged at the top of the prefabricated bearing platform, and a positioning support is arranged on the surface of the electric pole tower; prefabricated connecting beams are arranged on the side edges of the grouting steel pipes; a bolt A penetrates through a mounting block to enter the mounting block and a grouting steel pipe to be fixed, a gap between a hole in the surface of a prefabricated connecting beam and a main shaft steel pipe is filled with ultra-high-performance concrete, and after the main shaft steel pipe completely penetrates through the prefabricated connecting beam, a pressure bearing disc is welded; therefore, the mounting block, the grouting steel pipe, the prefabricated connecting beam and the main shaft steel pipe are assembled; the prefabricated bearing platform can be adjusted according to the number of the main shaft steel pipes, a fabricated structure is adopted, site construction operation is reduced, efficiency is improved, the extending grouting steel pipes, the prefabricated connecting beams and the main shaft steel pipes are arranged, the distribution area is enlarged, the contact face of the prefabricated bearing platform is enlarged, and stress is uniform.

Description

Technical Field

[0001] The invention belongs to the technical field of power transmission tower piles, and in particular relates to an assembled foundation cap suitable for power transmission tower pile foundations in soft soil areas and a construction method thereof. Background Art

[0002] Micro piles are currently widely used in power transmission and distribution projects in soft soil areas because of their small pile body, large bearing capacity, small construction equipment, high construction efficiency, and ease of construction in soft soil areas. The cap is the connecting part between the lower foundation piles and the upper structure, and plays an important role in connecting the upper and lower parts. The lower foundation piles in the power transmission and distribution project are constructed quickly on site; the upper steel poles or steel towers in the power transmission and distribution project are also finished products processed in the factory, and the on-site installation speed is also relatively fast; but the reinforced concrete cap located between the lower foundation piles and the upper structure is mostly cast-in-place, and the cast-in-place reinforced concrete cap requires a long period of maintenance to reach its design strength. The cast-in-place reinforced concrete cap has become the main factor that seriously restricts the construction speed of the power transmission and distribution tower.

[0003] In the related technology, a scheme of a transmission line combined structure assembled cap anchor foundation (Announcement No.: CN207714358U) was found through searching. When in use, the transmission line combined structure assembled cap anchor foundation adopts a prefabricated cap to replace the existing cast cap, which greatly reduces the amount of concrete pouring on site and greatly reduces wet operations. At the same time, under the premise of ensuring that the structural reliability is not reduced, the anchor end is set as a bolt anchor end, which can effectively reduce the height of the cap and further reduce the volume of the cap. In addition, the bracket is placed on the assembled cap and connected to the assembled cap with anchor bolts, so that the assembled cap and the bracket form a combined cap, which greatly reduces the volume and mass of the cap, changes the single concrete structure into a combined structure, and decomposes the original single cap individual foundation into multiple detachable and easy-to-transport prefabricated components.

[0004] However, the above technology is mainly used in areas with good geological conditions such as mountainous areas or hills. The lower part is an anchor rod, and the piles must be connected to the prefabricated pedestal in the soft soil area. They must provide both upward force to avoid foundation settlement caused by poor geological conditions under the pedestal, and downward force to avoid foundation overturning due to excessive horizontal loads of transmission lines. At the same time, the above technology cannot adjust and assemble multiple groups of anchor rods, resulting in a smaller contact surface of the prefabricated pedestal, uneven force, and a greater overall impact on the environment, making it inconvenient to use.

[0005] To this end, we propose an assembled cap suitable for transmission tower pile foundation in soft soil areas and a construction method thereof to solve the problems mentioned in the above background technology. Summary of the invention

[0006] The object of the present invention is to provide an assembled foundation for a transmission tower pile foundation in soft soil areas and a construction method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: an assembled cap suitable for transmission tower pile foundation in soft soil area, comprising: a prefabricated cap and a grouting steel pipe;

[0008] An electric pole tower is arranged on the top of the prefabricated foundation, and a positioning bracket is arranged on the surface of the electric pole tower, and the positioning bracket is fixedly arranged with the electric pole tower;

[0009] A prefabricated connecting beam is arranged on the side of the grouting steel pipe, the prefabricated connecting beam and the grouting steel pipe are welded, and a main shaft steel pipe is arranged inside the prefabricated connecting beam;

[0010] The surface of the prefabricated foundation is provided with a mounting mechanism, and the grouting steel pipe is fixed to the side of the prefabricated foundation through the mounting block of the mounting mechanism by bolts A to form an installation.

[0011] Preferably, the mounting blocks are connected to the surface of the prefabricated foundation at equal intervals, the bolts A are connected to the surface of the mounting blocks at equal intervals, one end of multiple groups of the bolts A extends to the interior of the prefabricated foundation, and the bolts A are used to install the mounting blocks.

[0012] Preferably, a steel rib is connected to the surface of the main shaft steel pipe, and the steel rib is located on the surface of the prefabricated connecting beam.

[0013] Preferably, the top of the positioning bracket is connected with wire brackets at equal intervals, and the wire brackets are fixed to the positioning bracket.

[0014] Preferably, bolts B are connected to the surface of the prefabricated foundation at equal intervals.

[0015] Preferably, a grouting hole is opened on the surface of the main shaft steel pipe inside the prefabricated connecting beam, and the grouting hole and the prefabricated connecting beam are integrally formed.

[0016] Preferably, spiral blades are connected at equal intervals on the surface of the main shaft steel pipe. The spiral blades are denser below the main shaft steel pipe, while the spiral blades are sparser above the main shaft steel pipe. The top of the main shaft steel pipe passes through the prefabricated connecting beam and is welded with a pressure plate.

[0017] The present invention also provides a construction method for an assembled cap of a micropile foundation of a power transmission tower in a soft soil area, which specifically comprises the following steps:

[0018] S1. Factory produces prefabricated caps and electric pole towers;

[0019] S2. Transport the prefabricated foundation and electric pole tower to the construction site;

[0020] S3, construct the steel pipe connecting the grouting main shaft;

[0021] S4, welding the pressure plate on the top of the micro spindle steel tube;

[0022] S5. Hoist the prefabricated cap to the designed elevation;

[0023] S6. Hoist the prefabricated connecting beam to the designed elevation;

[0024] S7. The holes on the surface of the prefabricated connecting beam and the gaps between the main shaft steel pipes are filled with ultra-high performance concrete;

[0025] S8, the upper steel rib plate whose surface of the welded main shaft steel pipe is located on the surface of the prefabricated connecting beam;

[0026] S9. Weld the steel plates of the prefabricated foundation and prefabricated connecting beam and install them using bolts A.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides an assembled cap suitable for a micro-pile foundation of a power transmission tower in a soft soil area and a construction method thereof, wherein the present invention welds a grouting steel pipe to a mounting block, brings the mounting block with the grouting steel pipe close to the surface of the prefabricated cap, and allows bolts A to pass through the mounting block and enter the mounting block and the grouting steel pipe for fixing, thereby allowing the grouting steel pipe, the prefabricated connecting beam and the main shaft steel pipe to be installed, and ultra-high performance concrete is filled in the gap between the holes on the surface of the prefabricated connecting beam and the main shaft steel pipe, and after the main shaft steel pipe completely passes through the prefabricated connecting beam, a pressure plate is welded, thereby assembling the mounting block, the grouting steel pipe, the prefabricated connecting beam and the main shaft steel pipe, so that the installation is more convenient;

[0028] The present invention is suitable for situations where there are a large number of main shaft steel pipes on the surface of the prefabricated pedestal. It can be adjusted according to the number of main shaft steel pipes and adopts an assembled structure. The on-site construction work is reduced and the efficiency is improved. The strength of UHPC is higher than that of ordinary concrete, and the stability may be improved. The matching operation has better adaptability to soft soil areas. Extended grouting steel pipes, prefabricated connecting beams and main shaft steel pipe parts are arranged to expand the distribution area, so that the contact surface of the prefabricated pedestal becomes larger, the force is evenly distributed, and the overall impact on the environment is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the prefabricated cap, the grouting steel pipe and the main shaft steel pipe when they are connected in the present invention;

[0031] Figure 3 It is a structural schematic diagram of the connection between the prefabricated bearing platform and the electric pole tower of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the prefabricated cap and the prefabricated connecting beam of the present invention when they are three-dimensionally connected;

[0033] Figure 5 This is a schematic diagram of the structure of the prefabricated cap and the installation block when they are three-dimensionally connected;

[0034] Figure 6 It is a schematic diagram of the structure of the four piles in the plane diagram of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of the twelve piles in the present invention;

[0036] Figure 8 It is a schematic diagram of the structure of the three piles in the plane diagram of the present invention;

[0037] Fig. 9 It is a schematic diagram of the structure when the main shaft steel pipe and the spiral blade are connected in the present invention.

[0038] In the figure: 1. Prefabricated pedestal; 2. Mounting block; 3. Grouting steel pipe; 4. Main shaft steel pipe; 5. Prefabricated connecting beam; 6. Bolt A; 7. Steel rib plate; 8. Electric pole tower; 9. Positioning bracket; 10. Conductor bracket; 11. Bolt B; 12. Grouting hole; 13. Spiral blade; 14. Pressure plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The present invention provides Figure 1-9 An assembled cap suitable for a micro-pile foundation of a power transmission tower in a soft soil area, comprising: a prefabricated cap 1, a power tower 8 is arranged on the top of the prefabricated cap 1, a positioning bracket 9 is arranged on the surface of the power tower 8, and the positioning bracket 9 is fixedly arranged with the power tower 8;

[0041] A grouting steel pipe 3, a prefabricated connecting beam 5 is arranged on the side of the grouting steel pipe 3, the prefabricated connecting beam 5 and the grouting steel pipe 3 are welded, and a main shaft steel pipe 4 is arranged inside the prefabricated connecting beam 5;

[0042] The surface of the prefabricated foundation 1 is provided with a mounting mechanism, and the grouting steel pipe 3 is fixed to the side of the prefabricated foundation 1 by bolts A6 through the mounting block 2 of the mounting mechanism to form an installation.

[0043] The mounting blocks 2 are connected to the surface of the prefabricated foundation 1 at equal intervals, the bolts A6 are connected to the surface of the mounting blocks 2 at equal intervals, one end of multiple groups of the bolts A6 extend to the interior of the prefabricated foundation 1, and the bolts A6 are used to install the mounting blocks 2.

[0044] The surface of the main shaft steel pipe 4 is connected with a steel rib plate 7 , and the steel rib plate 7 is located on the surface of the prefabricated connecting beam 5 .

[0045] The top of the positioning bracket 9 is connected with a wire bracket 10 at equal intervals, and the wire bracket 10 and the positioning bracket 9 are fixedly arranged.

[0046] Bolts B11 are connected at equal intervals on the surface of the prefabricated foundation 1 .

[0047] A grouting hole 12 is provided inside the prefabricated connecting beam 5 on the surface of the main shaft steel pipe 4 , and the grouting hole 12 and the prefabricated connecting beam 5 are integrally formed.

[0048] The surface of the main shaft steel pipe 4 is connected with spiral blades 13 at equal intervals. The spiral blades 13 are densely distributed below the main shaft steel pipe 4, while the spiral blades 13 are sparsely distributed above the main shaft steel pipe 4. The top of the main shaft steel pipe 4 passes through the prefabricated connecting beam 5 and is welded with a pressure plate 14.

[0049] The present invention also provides a construction method for an assembled cap of a micropile foundation of a power transmission tower in a soft soil area, which specifically comprises the following steps:

[0050] S1, the factory produces prefabricated foundation 1 and electric pole tower 8;

[0051] S2, transporting the prefabricated foundation 1 and the electric pole tower 8 to the construction site;

[0052] S3, construct the connecting grouting main shaft steel pipe 4;

[0053] S4, welding the pressure plate 14 on the top of the micro spindle steel tube 4;

[0054] S5. Hoist the prefabricated cap 1 to the designed elevation;

[0055] S6. Hoist the prefabricated connecting beam 5 to the designed elevation;

[0056] S7, filling the holes on the surface of the prefabricated connecting beam 5 and the gap between the main shaft steel pipe 4 with ultra-high performance concrete;

[0057] S8, welding the upper steel rib 7 of the main shaft steel pipe 4 on the surface of the prefabricated connecting beam 5;

[0058] S9. Weld the steel plates of the prefabricated cap 1 and the prefabricated connecting beam 5 and install them using bolts A6.

[0059] In summary, compared with the existing technology:

[0060] Example 1

[0061] The present invention welds the grouting steel pipe 3 to the mounting block 2, then brings the three groups of mounting blocks 2 with the grouting steel pipe 3 close to the surface of the prefabricated cap 1, then screws in the bolts A6, and allows the bolts A6 to pass through the mounting block 2 and enter the mounting block 2 and the grouting steel pipe 3 to be fixed, so that the grouting steel pipe 3, the prefabricated connecting beam 5 and the main shaft steel pipe 4 are installed, and the UHPC material (ultra-high performance concrete) is filled in the gap between the holes on the surface of the prefabricated connecting beam 5 and the main shaft steel pipe 4, and after the main shaft steel pipe 4 completely passes through the prefabricated connecting beam 5, the pressure plate 14 is welded, so that the three groups of mounting blocks 2, the grouting steel pipe 3, the prefabricated connecting beam 5 and the main shaft steel pipe 4 (such as Figure 8 Status shown), making installation more convenient;

[0062] Example 2

[0063] The present invention welds the grouting steel pipe 3 to the mounting block 2, then brings the four groups of mounting blocks 2 with the grouting steel pipe 3 close to the surface of the prefabricated cap 1, then screws in the bolts A6, and allows the bolts A6 to pass through the mounting block 2 and enter the mounting block 2 and the grouting steel pipe 3 to be fixed, so that the grouting steel pipe 3, the prefabricated connecting beam 5 and the main shaft steel pipe 4 are installed, and the UHPC material (ultra-high performance concrete) is filled in the gap between the holes on the surface of the prefabricated connecting beam 5 and the main shaft steel pipe 4, and after the main shaft steel pipe 4 completely passes through the prefabricated connecting beam 5, the pressure plate 14 is welded, so that the four groups of mounting blocks 2, the grouting steel pipe 3, the prefabricated connecting beam 5 and the main shaft steel pipe 4 (such as Figure 6 Status shown), making installation more convenient;

[0064] Example 3

[0065] The present invention welds the grouting steel pipe 3 to the mounting block 2, then brings the twelve groups of mounting blocks 2 with the grouting steel pipe 3 close to the surface of the prefabricated cap 1, then screws in the bolts A6, and allows the bolts A6 to pass through the mounting block 2 and enter the mounting block 2 and the grouting steel pipe 3 to be fixed, so that the grouting steel pipe 3, the prefabricated connecting beam 5 and the main shaft steel pipe 4 are installed, and the UHPC material (ultra-high performance concrete) is filled in the gap between the holes on the surface of the prefabricated connecting beam 5 and the main shaft steel pipe 4, and after the main shaft steel pipe 4 completely passes through the prefabricated connecting beam 5, the pressure plate 14 is welded, so that the twelve groups of mounting blocks 2, the grouting steel pipe 3, the prefabricated connecting beam 5 and the main shaft steel pipe 4 (such as Figure 7 Status shown), making installation more convenient;

[0066] The overall structure is suitable for the situation where there are a large number of main shaft steel pipes 4 on the surface of the precast foundation 1. It can be adjusted according to the number of main shaft steel pipes 4. The assembled structure is adopted to reduce on-site construction work and improve efficiency. The strength of UHPC is higher than that of ordinary concrete, and the stability may be improved. The mixed operation has better adaptability to soft soil areas. The extended grouting steel pipe 3, precast connecting beam 5 and main shaft steel pipe 4 are set to expand the distribution area, so that the contact surface of the precast foundation 1 becomes larger, the force is evenly distributed, and the overall impact on the environment is small.

[0067] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled cap suitable for pile foundation of power transmission tower in soft soil area, characterized in that: include: A prefabricated foundation (1), wherein an electric pole tower (8) is arranged on the top of the prefabricated foundation (1), and a positioning bracket (9) is arranged on the surface of the electric pole tower (8); A grouting steel pipe (3), wherein a prefabricated connecting beam (5) is arranged on the side of the grouting steel pipe (3), and a main shaft steel pipe (4) is arranged inside the prefabricated connecting beam (5); The surface of the prefabricated foundation (1) is provided with a mounting mechanism, and the grouting steel pipe (3) is fixed to the side of the prefabricated foundation (1) by means of a mounting block (2) of the mounting mechanism through bolts A (6) to form an installation.

2. The assembled cap suitable for pile foundation of power transmission tower in soft soil area according to claim 1, characterized in that: The mounting blocks (2) are connected to the surface of the prefabricated support platform (1) at equal intervals, the bolts A (6) are connected to the surface of the mounting blocks (2) at equal intervals, and one end of a plurality of groups of the bolts A (6) extends into the interior of the prefabricated support platform (1).

3. The assembled cap suitable for pile foundation of power transmission tower in soft soil area according to claim 1, characterized in that: The surface of the main shaft steel pipe (4) is connected with a steel rib plate (7), and the steel rib plate (7) is located on the surface of the prefabricated connecting beam (5).

4. The assembled cap suitable for pile foundation of power transmission tower in soft soil area according to claim 1, characterized in that: The top of the positioning bracket (9) is connected with a wire bracket (10) at equal intervals.

5. The assembled cap suitable for pile foundation of power transmission tower in soft soil area according to claim 1, characterized in that: Bolts B (11) are connected at equal intervals on the surface of the prefabricated foundation (1).

6. The assembled cap suitable for pile foundation of power transmission tower in soft soil area according to claim 1, characterized in that: Grouting holes (12) are provided inside the prefabricated connecting beam (5) and on the surface of the main shaft steel pipe (4).

7. The assembled cap suitable for pile foundation of power transmission tower in soft soil area according to claim 1, characterized in that: The surface of the main shaft steel pipe (4) is connected with spiral blades (13) at equal intervals, and the top of the main shaft steel pipe (4) passes through the prefabricated connecting beam (5) and is welded with a pressure plate (14).

8. A construction method for an assembled cap for a transmission tower pile foundation in soft soil areas according to any one of claims 1 to 7, characterized in that: The specific steps include: S1, the factory produces prefabricated caps (1) and electric pole towers (8); S2, transporting the prefabricated foundation (1) and the electric pole tower (8) to the construction site; S3, constructing the connecting grouting main shaft steel pipe (4); S4, welding the pressure plate (14) on the top of the micro spindle steel tube (4); S5. hoisting the prefabricated cap (1) to the designed elevation; S6, hoisting the prefabricated connecting beam (5) to the designed elevation; S7, filling the holes on the surface of the prefabricated connecting beam (5) and the gap between the main shaft steel pipe (4) with ultra-high performance concrete; S8, the surface of the welded main shaft steel pipe (4) is located on the upper steel rib plate (7) on the surface of the prefabricated connecting beam (5); S9. Weld the steel plates of the prefabricated cap (1) and the prefabricated connecting beam (5) and install them using bolts A (6).

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