Foundation for temporary power transmission pole erection

Abstract

The invention relates to the technical field of building structures, and mainly provides a foundation for erecting a temporary power transmission pole. Comprising a straight steel beam, a cantilever steel beam and a balancing weight, steel beam connecting pieces are arranged on the two sides of the middle of the straight steel beam respectively, mounting grooves are formed in the steel beam connecting pieces, and first bolt holes communicated with the mounting grooves are formed in the side portions of the steel beam connecting pieces. The two cantilever steel beams are arranged corresponding to the steel beam connecting pieces, the cantilever steel beams are perpendicular to the straight steel beams, one ends of the cantilever steel beams are embedded into the mounting grooves of the corresponding steel beam connecting pieces, second bolt holes are formed in one ends of the cantilever steel beams, and the cantilever steel beams are fixedly connected with the steel beam connecting pieces through the second bolt holes and the first bolt holes; the multiple balancing weights are detachably installed below the straight steel beams and the cantilever steel beams. The technical problems that an existing power transmission pole foundation structure is long in erection construction time and causes resource waste can be solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building structures, and particularly relates to a foundation for temporary power transmission pole erection. BACKGROUND

[0002] In the operation and maintenance of power systems, power departments often need to carry out circuit reconstruction or emergency repair work. During such work, it is often necessary to temporarily erect a section of line outside the original line path to ensure power supply or bypass the fault point. At this time, a temporary power transmission pole (or electric pole) needs to be quickly erected for effective bearing, support and space guidance of the cable and wire, thereby forming a temporary but safe and reliable power supply channel.

[0003] When erecting a power transmission pole, in order to ensure the verticality after erection and the balance and stability of the overall structure, and to prevent tilting or even collapse under the action of lateral loads such as wind force and wire tension, a firm foundation structure must be provided at the bottom of the pole. In the existing traditional technology, the most common and basic method is to use a concrete pouring foundation. This structure generally includes a foundation pit excavated in advance or on site, a steel reinforcement cage placed in the foundation pit, and a concrete body poured into the foundation pit and wrapped around the root of the power transmission pole. This foundation relies on the solidification and hardening of the concrete and the embedding action with the soil foundation to provide a fixed and rigid support point for the power transmission pole.

[0004] However, when the above-mentioned traditional concrete pouring foundation is applied to the erection of a temporary power transmission pole, its inherent technical defects become particularly prominent. First, concrete requires a long pouring, vibrating, curing and solidification time, which significantly prolongs the overall construction time in time-critical situations such as emergency repair, affecting the efficiency of power supply restoration. Second, after the temporary work is completed, the concrete foundation loses its purpose, but because it is integrated with the pole root and deeply buried underground, it is extremely difficult to remove and often can only be abandoned. This results in the inability to recycle building materials such as concrete and steel reinforcement, causing resource waste and generating construction waste. Finally, from a full-cycle perspective, the long construction and subsequent disposal process together result in high construction costs and low overall efficiency of temporary power facilities. Therefore, there is an urgent need for a new foundation structure suitable for temporary power transmission pole erection that can overcome the above-mentioned defects. SUMMARY

[0005] The embodiment of the present application provides a foundation for temporary power transmission pole erection, which can solve the technical problems of long construction time and resource waste of the existing power transmission pole foundation structure. The specific technical solution is as follows: This invention provides a foundation for erecting temporary power transmission poles, comprising a straight steel beam, a cantilevered steel beam, and counterweights. Steel beam connectors are respectively provided on both sides of the middle portion of the straight steel beam. Each steel beam connector has an installation groove perpendicular to the straight steel beam, and a first bolt hole communicating with the installation groove is provided on its side. Two cantilevered steel beams are provided corresponding to the steel beam connectors. Each cantilevered steel beam is perpendicular to the straight steel beam, with one end embedded in the installation groove of the corresponding steel beam connector. One end of each cantilevered steel beam has a second bolt hole matching the first bolt hole, and is fixedly connected to the steel beam connector through the second bolt hole and the first bolt hole. Multiple counterweights are provided and detachably installed below the straight steel beam and the cantilevered steel beam.

[0006] Optionally, the steel beam connector includes a horizontally arranged base plate and side plates vertically connected to both sides of the base plate. The base plate and the two side plates are welded and fixed to the straight steel beam on one side in the horizontal direction. The top surface of the base plate and the opposite surfaces of the two side plates define the mounting groove.

[0007] Optionally, the first bolt holes are disposed on the two side plates, and each side plate is provided with a plurality of the first bolt holes in an array.

[0008] Optionally, the steel beam connector further includes a central connecting bracket, comprising a circular central base plate and a central top cover plate. Multiple fixing screws protrude from the central base plate. A fourth bolt hole matching the fixing screw is provided on the straight steel beam. The straight steel beam spans the central base plate and is connected to the corresponding fixing screw through the fourth bolt hole. A fifth bolt hole matching the fixing screw is provided on the cantilevered steel beam. One end of the cantilevered steel beam is located on the central base plate and is connected to the corresponding fixing screw through the fifth bolt hole. A sixth bolt hole matching the multiple fixing screws is provided on the central top cover plate. The central top cover plate covers the central base plate, the straight steel beam, and one end of the cantilevered steel beam. The central top cover plate is connected to the corresponding fixing screw through the sixth bolt hole and locked in place by a nut. A transmission pole sleeve protrudes from the top of the central top cover plate.

[0009] Optionally, the plurality of fixing screws are configured as multiple groups, each group of fixing screws including an array of multiple fixing screws, and the multiple groups of fixing screws are arranged at uniform intervals around the central base plate in the circumferential direction.

[0010] Optionally, a seventh bolt hole is provided on the side wall of the power transmission pole sleeve, and a snap-fit ​​protrusion is provided on the inner wall of the power transmission pole sleeve.

[0011] Optionally, the counterweight is provided with an embedding groove, and the straight steel beam or the cantilever steel beam is embedded in the embedding groove.

[0012] Optionally, the top of the counterweight is provided with a figure-eight ring screw that spans above the embedding groove. The figure-eight ring screw includes a rod body and positioning rings located on both sides of the rod body. The rod body abuts against the straight steel beam or the cantilever steel beam. The top surface of the counterweight located on both sides of the embedding groove is provided with a third bolt hole that matches the positioning ring. The two ends of the figure-eight ring screw are fixedly connected to the counterweight through the positioning ring and the third bolt hole.

[0013] Optionally, the top of the straight steel beam is provided with a first groove that matches the rod body at even intervals along the extension direction, and the top of the cantilever steel beam is provided with a second groove that matches the rod body at even intervals along the extension direction.

[0014] Optionally, the counterweight block forms the third bolt hole by pre-embedding a bolt sleeve that communicates with the top surface.

[0015] Compared with the prior art, the beneficial effects of the embodiments of the present invention include at least the following: First, it is assembled from precast steel components and concrete counterweights, eliminating the need for on-site concrete pouring, thus avoiding the waiting time for concrete curing and significantly shortening the construction cycle. It is particularly suitable for emergency repairs and other urgent situations.

[0016] Secondly, all components are connected by detachable methods such as bolts. During dismantling, only the bolts need to be removed, and each component can be separated and recycled, realizing the recycling of materials and avoiding the waste of resources and construction waste caused by the difficulty of dismantling traditional concrete foundations.

[0017] Third, the counterweights can be flexibly increased or decreased according to actual load requirements, making them highly adaptable and ensuring both safety and avoiding excessive counterweight.

[0018] Fourth, the components can be transported separately, requiring less stringent conditions for transportation vehicles and road conditions, thus facilitating construction under limited site conditions. This technical solution effectively addresses the technical problems of long construction times and resource waste associated with existing power transmission pole foundation structures. Attached Figure Description

[0019] Figure 1 A three-dimensional structural diagram of a foundation for erecting temporary power transmission poles, provided as an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the straight steel beam and steel beam connector provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a straight steel beam provided in an embodiment of the present invention; Figure 4This is a schematic diagram of the cantilever steel beam provided in an embodiment of the present invention; Figure 5 A three-dimensional structural diagram of another foundation for erecting temporary power transmission poles provided in an embodiment of the present invention; Figure 6 for Figure 5 A schematic diagram of the structure where the upper cover plate of the center is lifted; Figure 7 An exploded view of the central connecting bracket provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the counterweight provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the figure-eight ring screw provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the ring head bolt provided in an embodiment of the present invention.

[0020] In the diagram: 1-Straight steel beam; 2-Cantilever steel beam; 3-Counterweight; 4-Steel beam connector; 4a-Mounting groove; 11-First notched groove; 12-Fourth bolt hole; 21-Second bolt hole; 22-Second notched groove; 23-Fifth bolt hole; 31-Embedded groove; 32-Figure-eight ring bolt; 33-Third bolt hole; 34-Ring head bolt; 41-First bolt hole; 42-Base plate; 43-Side plate; 44-Reinforcing rib plate; 45-Central connecting bracket; 46-Transmission pole sleeve; 321-Pole body; 322-Positioning ring; 451-Central base plate; 452-Central top cover plate; 461-Seventh bolt hole; 462-Snap-fit ​​protrusion; 4511-Fixing bolt; 4521-Sixth bolt hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Figure 1 A three-dimensional structural diagram of a foundation for erecting temporary power transmission poles, provided as an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the straight steel beam and steel beam connector provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a straight steel beam provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the cantilever steel beam provided in an embodiment of the present invention; Figure 5 A three-dimensional structural diagram of another foundation for erecting temporary power transmission poles provided in an embodiment of the present invention; Figure 6 forFigure 5 A schematic diagram of the structure where the upper cover plate of the center is lifted; Figure 7 An exploded view of the central connecting bracket provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the counterweight provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the figure-eight ring screw provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a ring head bolt provided in an embodiment of the present invention. Figures 1 to 6 As shown, an embodiment of the present invention provides a foundation for the erection of temporary power transmission poles, including a straight steel beam 1, a cantilevered steel beam 2, and a counterweight block 3.

[0023] Among them, steel beam connectors 4 are respectively provided on both sides of the middle part of the straight steel beam 1. The steel beam connectors 4 are provided with mounting grooves 4a perpendicular to the straight steel beam 1, and the side of the steel beam connectors 4 is provided with first bolt holes 41 that connect to the mounting grooves 4a.

[0024] Two cantilever steel beams 2 are provided with corresponding steel beam connectors 4. The cantilever steel beam 2 is perpendicular to the straight steel beam 1 and one end is embedded in the mounting groove 4a of the corresponding steel beam connector 4. One end of the cantilever steel beam 2 is provided with a second bolt hole 21 that matches the first bolt hole 41, and is fixedly connected to the steel beam connector 4 through the second bolt hole 21 and the first bolt hole 41.

[0025] Multiple counterweights 3 are provided and are detachably installed under the straight steel beam 1 and the cantilever steel beam 2.

[0026] In this embodiment of the invention, the straight steel beam 1 serves as the main beam of the foundation structure, extending horizontally along the direction of the power line guy wire. Its main function is to bear the vertical load transmitted by the transmission pole and the overturning moment in the direction of the guy wire. The straight steel beam 1 is preferably made of cold-formed hollow steel with a U-shaped cross-section. This cross-section effectively reduces its weight while ensuring strength and stiffness, facilitating transportation and installation. The length of the straight steel beam 1 is determined according to the actual engineering requirements, providing sufficient anti-overturning moment arm.

[0027] The middle section of the straight steel beam 1 is the installation location for the transmission pole. Steel beam connectors 4 are symmetrically arranged on both sides of the straight steel beam 1 at this location. The steel beam connectors 4 are key components for achieving a detachable connection between the straight steel beam 1 and the cantilevered steel beam 2. They are fixedly connected to the straight steel beam 1 by welding, forming an integrated structure to ensure the reliability of the connection and the effectiveness of force transmission.

[0028] Each steel beam connector 4 is provided with an installation groove 4a, the groove opening of which is perpendicular to the extension direction of the straight steel beam 1, i.e., perpendicular to the direction of the guy wire. This perpendicular arrangement allows the cantilever steel beam 2 to be inserted and installed in the installation groove 4a along a direction perpendicular to the guy wire, thereby achieving an orthogonal configuration between the straight steel beam 1 and the cantilever steel beam 2. The groove depth and width dimensions of the installation groove 4a match the cross-sectional dimensions of the cantilever steel beam 2, ensuring that the cantilever steel beam 2 has sufficient embedment depth after insertion, achieving reliable positioning and force transmission.

[0029] The steel beam connector 4 has a first bolt hole 41 on its side, which connects to the mounting groove 4a, allowing the bolt to pass through the first bolt hole 41 and be securely connected to the cantilevered steel beam 2 inserted into the mounting groove 4a. The location and number of the first bolt holes 41 are carefully designed to effectively restrict the relative movement of the cantilevered steel beam 2 relative to the steel beam connector 4 after the bolt connection, achieving a firm and reliable mechanical connection.

[0030] Two cantilever steel beams 2 are provided corresponding to the two steel beam connectors 4, extending from both sides of the straight steel beam 1 along a direction perpendicular to the guy wire. The two cantilever steel beams 2 and the straight steel beam 1 together form a cross-shaped planar layout, which ensures that the foundation structure has sufficient overturning resistance in all directions in the horizontal plane. The cantilever steel beams 2 are also preferably made of cold-formed hollow steel sections, with the same or similar U-shaped cross section as the straight steel beam 1, ensuring the overall structural coordination and mechanical performance matching.

[0031] Each cantilevered steel beam 2 is configured perpendicularly to the straight steel beam 1 at a 90-degree angle, with its end closest to the straight steel beam 1 serving as a connecting end. This connecting end is embedded in the mounting groove 4a of the corresponding steel beam connector 4. This embedded installation method ensures that after the cantilevered steel beam 2 is inserted into the mounting groove 4a, its lower surface and left and right sides are restricted by the inner wall of the mounting groove 4a, thereby achieving initial positioning and support.

[0032] The connecting end of the cantilever steel beam 2 is provided with a second bolt hole 21, the position and number of which correspond to and match the first bolt holes 41 on the steel beam connector 4. When the connecting end of the cantilever steel beam 2 is fully inserted into the mounting groove 4a, the second bolt hole 21 and the first bolt hole 41 are aligned in space. At this time, by passing a bolt through the second bolt hole 21 and the first bolt hole 41 and tightening it with a nut, a firm connection between the cantilever steel beam 2 and the steel beam connector 4 can be achieved, thereby realizing the overall connection between the cantilever steel beam 2 and the straight steel beam 1. This bolt connection method has the advantages of reliable connection and convenient assembly and disassembly, and is particularly suitable for the rapid construction and subsequent dismantling needs of temporary projects.

[0033] Multiple counterweights 3 are provided to increase the weight of the foundation structure, improve its anti-overturning capacity, and enhance overall stability. The counterweights 3 are preferably precast concrete blocks, with each block typically weighing 50-200 kg. The specific number and total weight are determined based on factors such as the height of the transmission pole, the weight of the conductor it carries, and wind loads. The counterweights 3 are detachably installed beneath the straight steel beam 1 and the cantilevered steel beam 2. This detachable installation method allows for flexible adjustment of the number and position of the counterweights 3 according to actual load requirements, ensuring necessary stability while avoiding transportation and installation difficulties caused by excessive counterweighting.

[0034] In practical use, the straight steel beam 1 is first placed horizontally at the pole erection location, aligning its center with the pole's installation point, extending along the guy wire direction. Then, two cantilevered steel beams 2 are inserted from both sides of the straight steel beam 1 into the corresponding mounting slots 4a of the steel beam connectors 4, and secured with bolts to complete the assembly of the cross-shaped foundation frame. Next, according to actual load requirements, counterweights 3 are installed at appropriate positions at each end and in the middle of the straight steel beam 1 and cantilevered steel beams 2. The counterweights 3 are fixed by friction with the steel beams through their own weight or through a specialized connection structure. Finally, the pole is erected and fixed at the center of the straight steel beam 1, thus completing the erection of the temporary pole foundation.

[0035] The working principle of this foundation structure is as follows: When the transmission pole is subjected to a vertical load (such as the weight of the conductor), the load is transferred through the transmission pole to the middle of the straight steel beam 1. The straight steel beam 1 achieves force balance through its bending stiffness and the support reaction force provided by the counterweight 3. When the transmission pole is subjected to a horizontal tensile force along the direction of the guy wire, an overturning moment is generated. This overturning moment is balanced by the anti-overturning moment provided by the counterweight 3 at the end of the straight steel beam 1. The longer the straight steel beam 1, the larger the anti-overturning moment arm, and the stronger the anti-overturning capacity. When the transmission pole is subjected to a lateral wind load perpendicular to the direction of the guy wire, an overturning moment is generated in that direction. At this time, the anti-overturning moment is provided by the two cantilever steel beams 2 and the counterweight 3 at their ends, achieving lateral stability. Therefore, through the cross-shaped configuration of the straight steel beam 1 and the cantilever steel beam 2, combined with the reasonable arrangement of multiple counterweights 3, this foundation can have sufficient load-bearing capacity and anti-overturning capacity in all directions in the horizontal plane, ensuring the safety and stability of the temporary transmission pole.

[0036] The technical advantages of this embodiment are as follows: First, it is assembled using precast steel components and concrete counterweights, eliminating the need for on-site concrete pouring, avoiding concrete curing time, and significantly shortening the construction cycle, making it particularly suitable for emergency repairs and other urgent situations. Second, all components use detachable connections such as bolts; during dismantling, only the bolts need to be removed, allowing each component to be separated and recycled, achieving material recycling and avoiding resource waste and construction waste problems caused by the difficulty of dismantling traditional concrete foundations. Third, the counterweights can be flexibly added or removed according to actual load requirements, offering strong adaptability while ensuring safety and avoiding excessive weighting. Fourth, the components can be transported separately, with lower requirements for transportation vehicles and road conditions, facilitating construction under limited site conditions. Through the above technical solutions, the technical problems of long construction time and resource waste caused by existing power transmission pole foundation structures are effectively solved.

[0037] Optionally, the steel beam connector 4 includes a horizontally arranged base plate 42 and side plates 43 vertically connected to both sides of the base plate 42. The base plate 42 and the two side plates 43 are welded and fixed to the straight steel beam 1 on one side in the horizontal direction. The top surface of the base plate 42 and the opposing surfaces of the two side plates 43 define an installation groove 4a. Exemplarily, in this embodiment of the invention, the base plate 42 is a rectangular steel plate, horizontally arranged, with its plane parallel to the ground. The length direction of the base plate 42 is consistent with the extension direction of the cantilever steel beam 2, and the width direction is consistent with the extension direction of the straight steel beam 1. The length of the base plate 42 is slightly larger than the cross-sectional width of the cantilever steel beam 2, and the width is slightly larger than the embedding depth requirement of the cantilever steel beam 2, ensuring that the cantilever steel beam 2 can be stably supported on the base plate 42 after insertion.

[0038] Two side plates 43 are provided, which are perpendicularly connected to the two long sides of the base plate 42 respectively. The two side plates 43 are arranged in parallel, and their spacing matches the cross-sectional width of the cantilever steel beam 2. The side plates 43 are connected to the base plate 42 by welding or integral casting to form a strong rigid connection, ensuring that the steel beam connector 4 as a whole has sufficient strength and rigidity.

[0039] The base plate 42 and the two side plates 43 are welded and fixed to the side of the straight steel beam 1 on one side in the horizontal direction, so as to ensure that the steel beam connector 4 can be reliably fixed on the straight steel beam 1 and can effectively transmit various loads from the cantilever steel beam 2.

[0040] The top surface of the base plate 42 and the inner surfaces of the two side plates 43 together define the mounting groove 4a. The mounting groove 4a is an upward-opening groove-shaped space, with the bottom of the groove being the top surface of the base plate 42 and the groove walls being the inner surfaces of the two side plates 43, with the groove opening facing upwards. The width of the mounting groove 4a (the distance between the two side plates 43) is closely matched with the cross-sectional width of the cantilever steel beam 2, generally with a 1-3mm assembly gap reserved, which ensures that the cantilever steel beam 2 can be smoothly inserted while avoiding loosening caused by excessive gaps. The depth of the mounting groove 4a (the distance from the top surface of the base plate 42 to the top of the side plates 43) is equivalent to the cross-sectional height of the cantilever steel beam 2, ensuring that the cantilever steel beam 2 can obtain sufficient support and constraint after insertion.

[0041] When the connecting end of the cantilever steel beam 2 is inserted into the mounting slot 4a, the bottom surface of the cantilever steel beam 2 is supported on the top surface of the base plate 42, and the two side walls of the cantilever steel beam 2 are constrained by the inner surfaces of the two side plates 43 respectively. This three-sided constraint structure effectively restricts the vertical and horizontal movement of the cantilever steel beam 2, achieving reliable positioning. Furthermore, the bolt connection through the first bolt hole 41 and the second bolt hole 21 further restricts the axial movement of the cantilever steel beam 2, thus achieving complete constraint and fixation of the cantilever steel beam 2 in three-dimensional space.

[0042] The steel beam connector 4 adopts a U-shaped cross-section structure composed of a base plate 42 and side plates 43, which is simple to manufacture and easy to process and weld. The mounting groove 4a formed by the U-shaped structure can provide three-sided constraint for the cantilever steel beam 2, ensuring accurate and reliable positioning. The base plate 42 provides bottom support for the cantilever steel beam 2, directly bearing the vertical load transmitted from the cantilever steel beam 2, with clear force distribution. The two side plates 43 restrict the lateral displacement of the cantilever steel beam 2 and provide bolt connection surfaces for axial fixation. The entire steel beam connector 4 is integrated with the straight steel beam 1 through multi-point welding, resulting in a clear force transmission path, reasonable structural stress distribution, and the ability to meet the bearing requirements of temporary power transmission pole foundations.

[0043] Optionally, the first bolt holes 41 are provided on the two side plates 43, and each side plate 43 has a plurality of first bolt holes 41 arranged in an array. Exemplarily, in this embodiment of the invention, the first bolt holes 41 are provided on the two side plates 43 of the steel beam connector 4. Each side plate 43 has a plurality of first bolt holes 41 arranged in an array, and these first bolt holes 41 are regularly arranged along the height direction and / or length direction of the side plate 43. Preferably, each side plate 43 has four first bolt holes 41, which can be arranged in a rectangular array or similar manner.

[0044] The technical solution of using an array of multiple first bolt holes 41 has the following advantages: First, multiple bolt connections can provide greater connection strength and rigidity, effectively resisting the relative displacement and rotation of the cantilever steel beam 2 under various loads, ensuring the reliability of the connection. Second, the multiple first bolt holes 41 are distributed at different positions, allowing for flexible selection of appropriate first bolt holes 41 for connection when there are manufacturing deviations in the height or length of the connection end of the cantilever steel beam 2, improving the adaptability and fault tolerance of the assembly. Third, in different engineering application scenarios, different load conditions may be faced. By selectively using some or all of the first bolt holes 41, the connection strength can be adjusted, satisfying the load-bearing requirements while avoiding over-design.

[0045] Optionally, both the straight steel beam 1 and the cantilever steel beam 2 are cold-formed hollow steel sections. Multiple second bolt holes 21, matching multiple first bolt holes 41, are arrayed on the opposite side walls of the cantilever steel beam 2. Exemplarily, in this embodiment of the invention, both the straight steel beam 1 and the cantilever steel beam 2 are made of cold-formed hollow steel sections. Cold-formed hollow steel sections are profiles with hollow cross-sections, processed from steel plates or strips using a cold-forming process. Common cross-sectional shapes include square and rectangular, and this invention preferably uses a rectangular (U-shaped) cross-section. Cold-formed hollow steel sections have the following advantages: First, the cross-sectional shape is regular, with high dimensional accuracy, facilitating connection and assembly. Second, the hollow cross-section reduces self-weight while maintaining the moment of inertia, improving material utilization. Third, the hollow cross-section has good bending and torsional resistance, making it suitable for use as beam components. Fourth, the cold-forming process has high production efficiency and relatively low cost, making it suitable for mass production.

[0046] Multiple second bolt holes 21 are arrayed on both opposite sidewalls of the connecting end of the cantilever steel beam 2. The position and number of these second bolt holes 21 match the multiple first bolt holes 41 on the two side plates 43 of the steel beam connector 4. Specifically, when the connecting end of the cantilever steel beam 2 is fully inserted into the mounting groove 4a of the steel beam connector 4, the second bolt holes 21 on the left side wall of the cantilever steel beam 2 are aligned with the first bolt holes 41 on the left side plate 43, and the second bolt holes 21 on the right side wall are aligned with the first bolt holes 41 on the right side plate 43, so that a fastening connection can be achieved by bolts passing through the aligned holes.

[0047] Using cold-formed hollow steel sections as the straight steel beam 1 and the cantilever steel beam 2 ensures both the necessary load-bearing capacity and structural rigidity while reducing self-weight and simplifying transportation and installation. Multiple second bolt holes 21 are arrayed on the opposite side walls of the cantilever steel beam 2, which, in conjunction with multiple first bolt holes 41 on the steel beam connector 4, form a multi-point bolted connection. This connection offers high strength, good shear and tensile resistance, and can meet the stress requirements of the temporary transmission pole under various load conditions, ensuring the safety and reliability of the foundation structure.

[0048] Optionally, the tops of the two side plates 43 are provided with horizontally arranged reinforcing ribs 44 extending in opposite directions, and one end face of the reinforcing ribs 44 in the horizontal direction is welded and fixed to the straight steel beam 1. Exemplarily, in this embodiment of the invention, by providing horizontally arranged reinforcing ribs 44 extending in opposite directions on the tops of the two side plates 43 and welding and fixing the reinforcing ribs 44 to the straight steel beam 1, the overall rigidity and strength of the steel beam connector 4 are significantly improved, the connection reliability between the steel beam connector 4 and the straight steel beam 1 is enhanced, the load-bearing capacity of the connection between the cantilever steel beam 2 and the straight steel beam 1 is improved, and the safety and stability of the temporary transmission pole foundation under heavy loads or harsh working conditions are ensured.

[0049] Optionally, refer to Figures 5 to 7The steel beam connector 4 also includes a central connecting bracket 45, comprising a circular central base plate 451 and a central upper cover plate 452. Multiple fixing screws 4511 protrude from the central base plate 451. The straight steel beam 1 has fourth bolt holes 12 that match the fixing screws 4511. The straight steel beam 1 spans the central base plate 451 and is connected to the corresponding fixing screws 4511 through the fourth bolt holes 12. The cantilevered steel beam 2 has fifth bolt holes 23 that match the fixing screws 4511. One end of the cantilevered steel beam 2 is located at... The central base plate 451 is connected to the corresponding fixing screw 4511 via the fifth bolt hole 23; the central upper cover plate 452 is provided with a sixth bolt hole 4521 that matches the multiple fixing screws 4511. The central upper cover plate 452 covers one end of the central base plate 451, the straight steel beam 1, and the cantilever steel beam 2. The central upper cover plate 452 is connected to the corresponding fixing screw 4511 via the sixth bolt hole 4521 and is locked in place with a nut. A transmission pole sleeve 46 protrudes from the top of the central upper cover plate 452. For example, based on the cross-shaped support formed by connecting one cantilever steel beam 2 to each side of the middle of the straight steel beam 1, the straight steel beam 1 and multiple cantilever beams 2 can be combined by setting a central connecting bracket 45 to achieve the combined installation of more cantilever steel beams 2. In this scheme, after determining the location of the transmission pole, a central base plate 451 is first installed. Both the central base plate 451 and the central top cover plate 452 are disc-shaped, and eight sets of fixing screws 4511 are arranged at equal angles around the center on top. Each set of fixing screws 4511 includes four fixing screws 4511 arranged in a rectangular array. Correspondingly, two sets of fourth bolt holes 12 are symmetrically arranged on both sides of the straight steel beam 1 near the center. Each set of fourth bolt holes 12 includes four fourth bolt holes 12 arranged in a rectangular array, corresponding to the two sets of fixing screws 4511 arranged on the central base plate 451. The end of the cantilever steel beam 2 used for connecting with the straight steel beam 1 is also provided with four fifth bolt holes 23 arranged in a rectangular array. After the straight steel beam 1 and the cantilever steel beam 2 are placed on the central base plate 451, the straight steel beam 1 is connected to the two sets of fixing screws 4511 on the central base plate 451 through the two sets of fourth bolt holes 12, forming a preliminary positioning installation. The cantilevered steel beams 2, which were originally vertically connected to both sides of the straight steel beam 1 via U-shaped steel beam connectors 4, can now be directly installed by engaging with two sets of fixing screws 4511 through the fifth bolt holes 23 at the ends. Furthermore, four additional cantilevered steel beams 2 can be installed, corresponding to the remaining four sets of fixing screws 4511 on the central base plate 451 via the fifth bolt holes 23 at the ends, thus achieving a combined assembly of one straight steel beam 1 and six cantilevered steel beams 2.Next, the central top cover plate 452 is coaxially placed above the central bottom plate 451. At this time, multiple sets of fixing screws 4511 extending above the straight steel beam 1 and the cantilever steel beam 2 will be further inserted into the sixth bolt holes 4521 on the central top cover plate 452. After the central top cover plate 452 is installed in place and pressed onto the upper end faces of the straight steel beam 1 and the six cantilever steel beams 2, the top ends of the multiple sets of fixing screws 4511 will finally extend from the top of the central top cover plate 452. At this time, the straight steel beam 1 and the six cantilever steel beams 2 can be longitudinally and tightly fixed by tightening the nuts respectively. After the assembly of the lower foundation structure is completed, the upper transmission pole can be positioned and installed through the top transmission pole sleeve 46.

[0050] In other possible implementation methods, in order to facilitate standardized prefabrication and assembly, the straight steel beam 1 may not be selected. Instead, multiple cantilever steel beams 2 may be selected and axially configured through a central connecting bracket 45. This invention does not limit this.

[0051] Optionally, a seventh bolt hole 461 is provided on the side wall of the transmission pole sleeve 46, and a snap-fit ​​protrusion 462 is provided on the inner wall of the transmission pole sleeve 46. Exemplarily, in this embodiment of the invention, the inner wall of the transmission pole sleeve 46 is roughened to form a toothed snap-fit ​​protrusion 462, increasing the friction between the protrusion and the side wall of the transmission pole inserted inside, ensuring stable assembly. Simultaneously, by providing the seventh bolt hole 461 on the side wall, a fixing screw can be laterally screwed into a pre-drilled hole on the transmission pole for fixation, resulting in a simple structure and convenient assembly.

[0052] Optionally, the counterweight 3 is provided with an embedding groove 31, into which the straight steel beam 1 or the cantilever steel beam 2 is embedded. Exemplarily, in this embodiment of the invention, each counterweight 3 has an embedding groove 31 at its top. The embedding groove 31 is a groove-shaped structure recessed downwards from the top surface of the counterweight 3, and its cross-sectional shape matches the outer contour of the straight steel beam 1 or the cantilever steel beam 2. Since both the straight steel beam 1 and the cantilever steel beam 2 have rectangular hollow cross-sections, the cross-section of the embedding groove 31 is also rectangular, and its internal dimensions (groove width and groove depth) closely match the external dimensions (cross-sectional width and height) of the straight steel beam 1 or the cantilever steel beam 2. When installing the counterweight 3, the counterweight 3 is moved upwards from below the straight steel beam 1 or the cantilever steel beam 2, causing the straight steel beam 1 or the cantilever steel beam 2 to embed into the embedding groove 31 at the top of the counterweight 3. After being embedded in place, the bottom and two side walls of the straight steel beam 1 or cantilever steel beam 2 are surrounded and constrained by the bottom and two walls of the embedded groove 31. This three-sided constraint effectively restricts the lateral movement (perpendicular to the axial direction of the steel beam) of the counterweight 3 relative to the steel beam, preventing lateral slippage or swaying of the counterweight 3 during use. This improves the stability and reliability of the counterweight 3 installation. The embedded connection structure is simple, requiring no additional connectors, and is easy to install and disassemble, reducing construction difficulty, shortening construction time, and further improving the rapid erection capability and economy of temporary power transmission pole foundations.

[0053] Optionally, the counterweight 3 is provided with a figure-eight ring screw 32 spanning above the embedded groove 31. The figure-eight ring screw 32 includes a rod body 321 and positioning rings 322 located on both sides of the rod body 321. The rod body 321 abuts against the straight steel beam 1 or the cantilevered steel beam 2. The top surface of the counterweight 3 located on both sides of the embedded groove 31 is provided with third bolt holes 33 that match the positioning rings 322. The two ends of the figure-eight ring screw 32 are fixedly connected to the counterweight 3 through the positioning rings 322 and the third bolt holes 33. The figure-eight ring screw 32 is fixedly connected to the counterweight 3 through the positioning rings 322 and the third bolt holes 33 at both ends. The specific connection method is as follows: the figure-eight ring screw 32 is placed horizontally on the top surface of the counterweight 3, so that the rod body 321 spans the embedded groove 31 and abuts against the top surface of the steel beam, and the two positioning rings 322 are respectively aligned with the third bolt holes 33 on both sides of the embedded groove 31. Then, a bolt is inserted through each positioning ring 322, and after passing through the positioning ring 322, the bolt is screwed into the third bolt hole 33. After tightening the bolt, the bolt head presses against the positioning ring 322, and the positioning ring 322 presses down on the steel beam through the rod body 321, thereby securing the counterweight 3, the figure-eight ring screw 32, and the steel beam together. The figure-eight ring screw 32 forms a transverse tension member, with both ends fixed to the counterweight 3 by ring head bolts 34, and the middle rod body 321 pressing against the steel beam. When the ring head bolts 34 are tightened, the positioning ring 322 is subjected to the tension of the ring head bolts 34, and this tension is transmitted through the rod body 321 as pressure on the steel beam, pressing the steel beam downward against the bottom of the embedded groove 31. This pressing action prevents the steel beam from coming out of the embedded groove 31, and increases the normal pressure between the steel beam and the bottom of the embedded groove 31, thereby increasing the friction and further restricting the axial slippage of the steel beam relative to the counterweight 3.

[0054] This fixing method not only prevents the counterweight from moving laterally, but also effectively prevents the counterweight from detaching from the steel beam, significantly improving the stability and safety of the counterweight installation and ensuring the reliable operation of the temporary transmission pole foundation under various complex load conditions. Meanwhile, the figure-eight ring bolts 32 are easy to install and remove, requiring only tightening or loosening of the bolts, maintaining the advantages of rapid construction and dismantling.

[0055] Optionally, the top of the straight steel beam 1 is provided with a first groove 11 that matches the rod body 321, and the top of the cantilever steel beam 2 is provided with a second groove 22 that matches the rod body 321. Exemplarily, in this embodiment of the invention, the first groove 11 that matches the rod body 321 is provided on the top of the straight steel beam 1, and the second groove 22 that matches the rod body 321 is provided on the top of the cantilever steel beam 2, allowing the rod body 321 of the figure-eight ring screw 32 to be partially embedded in the groove. This achieves shape matching and mechanical locking between the counterweight 3 and the steel beam, greatly improving the counterweight's ability to resist axial slippage, ensuring that the counterweight is more firmly and reliably fixed on the steel beam, and further enhancing the overall stability and safety of the temporary power transmission pole foundation.

[0056] Optionally, multiple first notched grooves 11 are provided and evenly spaced along the extension direction of the straight steel beam 1, and multiple second notched grooves 22 are provided and evenly spaced along the extension direction of the cantilever steel beam 2. Exemplarily, in this embodiment of the invention, the technical solution of evenly spaced multiple notched grooves allows the counterweight 3 to be installed and fixed at multiple predetermined positions along the axial direction of the steel beam. In different engineering application scenarios, the load conditions of the transmission pole may be different, and the direction of the guy wire may be different; therefore, different numbers of counterweights need to be arranged at different positions on the steel beam. By setting multiple notched grooves, counterweights can be installed at any suitable notched groove position according to actual needs, achieving flexible configuration and optimized arrangement of the counterweight.

[0057] For example, when the tension in the guy wire is large, more counterweights can be placed at the end of the straight steel beam 1 furthest from the transmission pole to increase the anti-overturning lever arm; when the lateral wind load is large, more counterweights can be placed at the end of the cantilever steel beam 2. By flexibly installing counterweights at different groove positions, the stress state of the foundation can be precisely controlled. The number of counterweights used can be optimized while ensuring safety, and the use of counterweights can be optimized while ensuring the safety and stability of the foundation, thus improving the system's economy, versatility, and maintainability.

[0058] Optionally, the counterweight 3 forms a third bolt hole 33 by pre-embedding a bolt sleeve communicating with the top surface. Exemplarily, in this embodiment of the invention, the counterweight 3 forms a third bolt hole 33 by pre-embedding a bolt sleeve communicating with the top surface. Specifically, during the manufacturing process of the counterweight 3, i.e., during the concrete pouring and molding stage, a bolt sleeve is pre-placed at a corresponding position in the counterweight mold, and then concrete is poured. After the concrete solidifies, the bolt sleeve is firmly embedded inside the counterweight 3, with the upper end of the bolt sleeve flush with or slightly lower than the top surface of the counterweight 3, thereby forming a third bolt hole 33 communicating with the top surface.

[0059] Bolt sleeves provide precise internal threads, allowing bolts to be easily screwed in and achieving a reliable threaded connection with high strength and resistance to loosening. Drilling directly into concrete creates rough, unthreaded holes, requiring bolts to be tightened only with nuts, which is prone to loosening. Furthermore, bolt sleeves are made of steel, whose strength and rigidity far exceed that of concrete, enabling them to withstand greater tensile and shear forces and resist damage. Drilling directly into concrete, with its concrete walls, is susceptible to breakage under repeated tightening and loads, leading to connection failure. Finally, bolt sleeves are pre-embedded during concrete pouring, forming a single, secure unit that prevents them from detaching from the concrete. Pre-drilling or pre-drilling methods carry the risk of hole wall cracking or hole enlargement.

[0060] In summary, this invention constructs a novel foundation structure suitable for temporary power transmission pole erection by using a cross-shaped foundation frame formed by the perpendicular cooperation of straight steel beams 1 and cantilever steel beams 2, combined with the flexible arrangement and reliable fixing of multiple counterweights 3. This foundation structure is assembled from prefabricated components, eliminating the need for on-site concrete pouring, enabling rapid construction, convenient dismantling, and material recycling. It effectively solves the technical problems of long construction time, difficult dismantling, and resource waste associated with traditional concrete foundations. It is particularly suitable for the needs of emergency repairs and temporary renovation projects in power systems, demonstrating significant technological advancement and practical value.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A foundation for the erection of temporary power transmission poles, characterized in that, include: Straight steel beam (1), cantilever steel beam (2) and counterweight (3). Steel beam connectors (4) are provided on both sides of the middle part of the straight steel beam (1). The steel beam connectors (4) are provided with mounting grooves (4a) perpendicular to the straight steel beam (1). The side of the steel beam connectors (4) is provided with first bolt holes (41) that connect to the mounting grooves (4a). The cantilever steel beam (2) is provided in two corresponding to the steel beam connector (4). The cantilever steel beam (2) is perpendicular to the straight steel beam (1) and one end is embedded in the mounting groove (4a) of the corresponding steel beam connector (4). One end of the cantilever steel beam (2) is provided with a second bolt hole (21) that matches the first bolt hole (41), and is fixedly connected to the steel beam connector (4) through the second bolt hole (21) and the first bolt hole (41). Multiple counterweights (3) are provided and are detachably installed below the straight steel beam (1) and the cantilever steel beam (2).

2. The foundation for erecting temporary transmission poles according to claim 1, characterized in that, The steel beam connector (4) includes a horizontally arranged base plate (42) and side plates (43) vertically connected to both sides of the base plate (42). The base plate (42) and the two side plates (43) are welded and fixed to the straight steel beam (1) on one side in the horizontal direction. The top surface of the base plate (42) and the opposite surfaces of the two side plates (43) define the mounting groove (4a).

3. The foundation for erecting temporary transmission poles according to claim 2, characterized in that, The first bolt hole (41) is provided on the two side plates (43), and each side plate (43) is provided with a plurality of the first bolt holes (41) in an array.

4. The foundation for erecting temporary transmission poles according to claim 2, characterized in that, The steel beam connector (4) also includes a central connecting bracket (45), comprising a circular central base plate (451) and a central upper cover plate (452). Multiple fixing screws (4511) protrude from the central base plate (451). A fourth bolt hole (12) matching the fixing screw (4511) is provided on the straight steel beam (1). The straight steel beam (1) spans the central base plate (451) and is connected to the corresponding fixing screw (4511) through the fourth bolt hole (12). A fifth bolt hole (23) matching the fixing screw (4511) is provided on the cantilever steel beam (2). One end of the cantilever steel beam (2) is located at... The central base plate (451) is connected to the corresponding fixing screw (4511) through the fifth bolt hole (23); the central upper cover plate (452) is provided with a sixth bolt hole (4521) that matches the plurality of fixing screws (4511); the central upper cover plate (452) is covered above one end of the central base plate (451), the straight steel beam (1) and the cantilever steel beam (2); the central upper cover plate (452) is connected to the corresponding fixing screw (4511) through the sixth bolt hole (4521) and is locked and fixed by a nut; a transmission pole sleeve (46) is provided on the top of the central upper cover plate (452).

5. The foundation for erecting temporary transmission poles according to claim 4, characterized in that, The plurality of fixing screws (4511) are configured in multiple groups, each group of fixing screws (4511) including an array of multiple fixing screws (4511), and the multiple groups of fixing screws (4511) are evenly spaced around the central base plate (451) in the circumferential direction.

6. The foundation for erecting temporary transmission poles according to claim 4, characterized in that, The transmission pole sleeve (46) has a seventh bolt hole (461) on its side wall and a snap-fit ​​protrusion (462) on its inner wall.

7. The foundation for erecting temporary transmission poles according to any one of claims 1 to 6, characterized in that, The counterweight (3) is provided with an embedding groove (31), and the straight steel beam (1) or the cantilever steel beam (2) is embedded in the embedding groove (31).

8. The foundation for erecting temporary transmission poles according to claim 7, characterized in that, The counterweight (3) is provided with a figure-eight ring screw (32) spanning above the embedded groove (31) at the top. The figure-eight ring screw (32) includes a rod body (321) and positioning rings (322) located on both sides of the rod body (321). The rod body (321) abuts against the straight steel beam (1) or the cantilever steel beam (2). The top surface of the counterweight (3) located on both sides of the embedded groove (31) is provided with a third bolt hole (33) that matches the positioning ring (322). The two ends of the figure-eight ring screw (32) are fixedly connected to the counterweight (3) through the positioning ring (322) and the third bolt hole (33).

9. The foundation for erecting temporary transmission poles according to claim 8, characterized in that, The top of the straight steel beam (1) is provided with a first groove (11) that matches the rod (321) at even intervals along the extension direction, and the top of the cantilever steel beam (2) is provided with a second groove (22) that matches the rod (321) at even intervals along the extension direction.

10. The foundation for erecting temporary transmission poles according to claim 8, characterized in that, The counterweight (3) forms the third bolt hole (33) by pre-embedding a bolt sleeve that communicates with the top surface.

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