Rigid connecting device, spiral anchor single anchor foundation and overhead transmission line iron tower foundation

Abstract

The utility model discloses a rigid connecting device, a spiral anchor single anchor foundation and an overhead transmission line iron tower foundation. The rigid connecting device comprises a hoop, a connecting plate and a connecting rod piece, wherein the connecting plate is combined and fixed on the peripheral surface of the hoop; the hoop comprises two hoop profiles, and the two hoop profiles are spliced to form a hoop shape and configured to enable the rigid connecting device to be fixedly arranged on an anchor rod of the single-screw anchor in a sleeving mode, and the hoop profiles and the anchor rod are coaxially arranged; the direction of an opening formed between the two hoop profiles is perpendicular to the center direction of the tower position; the connecting plates are combined and fixed to the outer surface of one hoop profile and comprise the first connecting plate and the second connecting plate, an angle is formed between the first connecting plate and the second connecting plate, and the center line of the included angle between the first connecting plate and the second connecting plate passes through the center of the tower position; the connecting rod piece is fixedly combined with the first connecting plate, the second connecting plate is configured to be fixedly combined with the connecting rod piece of the rigid connecting device of the adjacent spiral anchor single anchor foundation, and the displacement of the top of the spiral anchor foundation can be remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to spiral anchor foundation technical field, more specifically, a rigid connecting device, spiral anchor single anchor foundation and overhead transmission line iron tower foundation. BACKGROUND

[0002] In the overhead transmission line construction, the iron tower foundation is the key part of ensuring the safe and stable operation of the transmission line. The traditional iron tower foundation mostly adopts the concrete step foundation, the concrete pile foundation and the like. However, these traditional foundations have significant disadvantages, among which the problem of long concrete setting time is particularly prominent. Generally, the iron tower foundation needs nearly a month from pouring to meeting the iron tower erection condition, which seriously delays the construction progress of the transmission line tower, increases the engineering construction period, and greatly increases the construction cost.

[0003] In recent years, the spiral anchor foundation gradually rises as a new type of foundation form and is widely applied. The spiral anchor foundation has many advantages, can be standardized processed in the factory, and the on-site construction is convenient and efficient, and 4-5 foundation iron towers can be constructed per day. Moreover, after the construction is completed, there is no need to wait for the long setting time, and the iron tower erection and stringing work can be immediately carried out, which greatly shortens the construction period and significantly improves the construction efficiency. Meanwhile, the spiral anchor foundation has simple structure and less damage to the environment, and is a new, environmentally friendly and efficient transmission line iron tower foundation. UTILITY MODEL CONTENTS

[0004] In view of the above problems, one purpose of the utility model is to provide a rigid connecting device of a spiral anchor single anchor foundation, which can effectively reduce the displacement of the top of the spiral anchor foundation and improve the stability of the iron tower foundation.

[0005] Another purpose of the utility model is to provide a spiral anchor single anchor foundation comprising the rigid connecting device.

[0006] Still another purpose of the utility model is to provide an overhead transmission line iron tower foundation comprising the spiral anchor single anchor foundation.

[0007] To achieve the above purposes, the utility model adopts the following technical solutions:

[0008] According to one aspect of the utility model, a rigid connecting device is provided, which comprises:

[0009] The hoop, the connecting plate fixed to the outer peripheral surface of the hoop, and the connecting rod;

[0010] The hoop comprises two hoop profiles, the two hoop profiles are spliced to form a hoop shape, and the hoop is configured to be sleeved and fixed on the anchor rod of the single spiral anchor and arranged coaxially with the anchor rod.

[0011] The direction of the opening formed between the two hoop profiles is perpendicular to the center direction of the tower site;

[0012] The connecting plate is fixedly combined to the outer surface of one of the hoop profiles, and the connecting plate comprises a first connecting plate and a second connecting plate, which are arranged at an angle, and the middle line of the included angle between the first connecting plate and the second connecting plate passes through the center of the tower site;

[0013] The connecting rod is fixedly combined to the first connecting plate, and the second connecting plate is configured to be fixedly combined to the connecting rod of the rigid connecting device of the adjacent single-anchor foundation of the spiral anchor.

[0014] In addition, the hoop profile comprises a semi-circular hoop body and connecting ears located on both sides of the hoop body, the end of the first connecting plate and the end of the second connecting plate are fixedly combined to the outer circumferential surface of the hoop body, and the reverse extension line of the first connecting plate and the reverse extension line of the second connecting plate converge on the central axis of the hoop body.

[0015] The connecting ears are provided with connecting holes, and bolts are connected in the connecting holes, and the axial direction of the connecting holes is perpendicular to the axial direction of the hoop body.

[0016] Two hoop profiles are connected by two parallel bolts to adjust the size of the opening between the two hoop bodies, and the hoop is fixedly sleeved on the anchor rod.

[0017] In addition, the inner diameter R of the hoop body is calculated by the following formula:

[0018] R = r + 3mm

[0019] Wherein, r is the outer diameter of the anchor rod connected by the hoop.

[0020] In addition, the hoop body and the connecting ear of the other hoop profile are fixedly combined with a stiffening rib.

[0021] The thickness of the hoop body and the connecting ear is the same, which is 8-12mm, and the thickness of the stiffening rib is 8mm.

[0022] In addition, the rigid connecting device further comprises a first stiffening plate fixedly combined between the first connecting plate and the hoop, and a second stiffening plate fixedly combined between the second connecting plate and the hoop.

[0023] One end of the first stiffening plate is fixedly combined to the end of the first connecting plate away from the hoop, and the other end is fixedly combined to the connecting ear of the hoop profile where the connecting plate is located and close to the first connecting plate.

[0024] One end of the second stiffening plate and the second connecting plate are combined and fixed away from the one end of the hoop, and the other end and the hoop profile where the connecting plate is located are combined and fixed close to the connecting lug of the second connecting plate;

[0025] The thickness of the first connecting plate and the second connecting plate is the same, and is 10-12mm;

[0026] The thickness of the first stiffening plate and the second stiffening plate is the same, and is 10-12mm.

[0027] In addition, the optional scheme is that a plurality of fixing holes are arranged on the first connecting plate and the second connecting plate, and the first connecting plate and the connecting rod are connected through fixing bolts, and the second connecting plate and the connecting rod of the rigid connecting device of the adjacent single anchor foundation of the spiral anchor are connected.

[0028] In addition, the optional scheme is that the hoop, the connecting plate and the connecting rod are all hot-dip galvanized steel materials.

[0029] According to another aspect of the utility model, a spiral anchor single anchor foundation is provided, which comprises a single spiral anchor and a rigid connecting device;

[0030] The rigid connecting device is combined and fixed on the anchor rod of the single spiral anchor through the hoop.

[0031] In addition, the optional scheme is that the angle between the first connecting plate and the central axis of the hoop and the angle between the second connecting plate and the central axis of the hoop change with the angle of the anchor rod rotating into the ground;

[0032] The angle between the first connecting plate and the central axis of the hoop is equal to the angle between the central axis of the anchor rod and the horizontal ground;

[0033] The angle between the second connecting plate and the central axis of the hoop is equal to the angle between the central axis of the anchor rod and the horizontal ground.

[0034] According to another aspect of the utility model, an overhead transmission line tower foundation is provided, which comprises four spiral anchor single anchor foundations, the four spiral anchor single anchor foundations are arranged in a rectangular structure, and the single spiral anchors of the four spiral anchor single anchor foundations are rigidly connected through the rigid connecting device;

[0035] The angle between the first connecting plate and the second connecting plate of the same spiral anchor single anchor foundation is 90°.

[0036] The utility model has the advantages of the following:

[0037] In view of the technical problems existing in the prior art, the utility model provides a rigid connecting device, a spiral anchor single anchor foundation and an overhead transmission line iron tower foundation, four single spiral anchors of the overhead transmission line iron tower foundation are connected into a rigid whole through the design of the rigid connecting device, the load borne by the tower is effectively dispersed and transmitted, and the displacement of the top of the spiral anchor foundation is significantly reduced. When the tower bears various complex loads, the rigid connecting device can coordinate the common stress of the single spiral anchors, avoid the displacement of the top steel bearing platform of the single spiral anchor caused by uneven stress, ensure that the stability of the iron tower foundation meets the specification requirements, and guarantee the safe and stable operation of the transmission line.

[0038] The rigid connecting device is connected with the single spiral anchor through a hoop and is fastened by bolts, and this movable connection mode brings great convenience to construction. After the single spiral anchor is constructed, the position of the hoop can be flexibly adjusted by the construction personnel, fastening operation is carried out, and the operation is simple and fast, so that the construction efficiency is effectively improved, the construction difficulty is reduced, and the engineering construction period is shortened.

[0039] The fixed bolts are adopted between the connecting plates and the connecting rods, so that the whole rigid connecting device has good universality. In different engineering scenes, different specifications of connecting rods (such as different types of angle steels and steel pipes) can be flexibly selected according to actual needs to meet the connection requirements of various spiral anchor foundations and iron towers, and the application range of the device is improved.

[0040] The rigid connecting device is installed at a position of 0.5 m below the ground level of +0.00, the ditch is backfilled with the original soil after fastening is completed, the original ground surface is not affected, the passive resistance of the soil can be fully utilized, the effect similar to the "invisible ground beam" is formed, the friction between the connecting rods buried in the ground and the surrounding soil makes the soil mechanically stop the square frame structure formed, physically limits the movement space of the steel bearing platform, and the anti-sliding capacity of the single spiral anchor is enhanced. In addition, the environmental isolation effect can be achieved, the influence of the sudden change of the surface temperature on the deformation of the steel is avoided, when the temperature difference AT is 30 DEG C, the free expansion amount of 10 m long steel is 3.6 mm, and after being buried, the expansion amount can be reduced to 0.5 mm due to the constraint of the soil.

[0041] All the steel parts of the rigid connecting device are subjected to hot-dip galvanizing anticorrosion treatment. The hot-dip galvanizing process forms a dense zinc layer on the surface of the steel part, effectively prevents the corrosion of the steel part by air, moisture and the like, prevents the steel part from being corroded in the long-term use process, greatly prolongs the service life of the rigid connecting device, makes the rigid connecting device meet the safety period requirement of the project, reduces the later maintenance cost, and improves the reliability and stability of the whole transmission line iron tower foundation. BRIEF DESCRIPTION OF DRAWINGS

[0042] The specific embodiments of the utility model will be further described in detail below with reference to the drawings.

[0043] Figure 1 A structure diagram of a single helix anchor in the prior art is shown.

[0044] Figure 2 A layout diagram of a foundation of an overhead transmission line tower in the prior art is shown.

[0045] Figure 3 A diagram showing a conventional single helix anchor being screwed into the ground is shown.

[0046] Figure 4 A side view of the rigid connecting device is shown.

[0047] Figure 5 A top view of the rigid connecting device is shown.

[0048] Figure 6 A structure diagram of the first connecting plate is shown.

[0049] Figure 7 An assembly diagram of the rigid connecting device provided by the embodiment of the utility model for realizing rigid connection between single anchor foundations of helix anchors at a position of 0.5m below the ground ±0.00 is shown.

[0050] Figure 8 A structure diagram of the single anchor foundation of the helix anchor is shown.

[0051] Figure 9 A layout diagram of the foundation of the overhead transmission line tower provided by the embodiment of the utility model when the single helix anchor is vertically screwed in is shown.

[0052] Figure 10 A layout diagram of the foundation of the overhead transmission line tower provided by the embodiment of the utility model when the single helix anchor is obliquely screwed in is shown DETAILED DESCRIPTION

[0053] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings rather than all the structures.

[0054] In the description of the utility model, unless another definite provision and limitation, the term "connect", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integral; can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship. For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning in the utility model.

[0055] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, can also include the first and second features are not direct contact but contact through the additional feature between them.

[0056] In the description of the embodiment, the terms "on", "under", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0057] The single helical anchor 1 of the conventional overhead transmission line tower spiral anchor single anchor foundation is as shown in Figure 1 The anchor rod 11 adopts straight seam welded pipe or seamless steel pipe, the anchor disc 12 adopts steel plate and is pressed and processed through special equipment. The anchor rod 11 and the anchor disc 12 are matched according to the drawing requirements and then welded. According to the size of the stress of the tower and the geological conditions of the site, according to the root opening size, the base anchor of the single helical anchor is vertically or at a certain angle into the soil, and then the steel bearing platform 14 is arranged at the top end of the base anchor, and the tower foot of the tower is connected with the bolt, and the assembly of the tower and the helical anchor foundation is completed.

[0058] The overhead transmission line tower foundation is generally composed of four helical anchor single anchor foundations, and is generally arranged in a square or rectangular cross section, as shown in Figure 2 .

[0059] However, the conventional helical anchor single anchor foundation exposes a serious problem in practical application. Whether the single helical anchor rod is vertically rotated into the soil (as shown in Figure 3 Figure a), or in the case of inclined rotation (as shown in Figure 3As shown in FIG. 2, when the tower bears various loads, the displacement of the steel bearing platform 14 at the top of the anchor rod 11 is prone to be too large. Such displacement may exceed the requirements of relevant specifications, which not only affects the stability of the tower foundation, but also may cause safety hazards such as tower inclination and line failure, greatly limiting the widespread application of the single-anchor foundation of the screw anchor in practical engineering.

[0060] As a key force transmission component in the foundation of the overhead transmission line tower, the steel bearing platform is used to connect the tower leg and the screw anchor foundation, and bears the important role of transmitting the tower body load (vertical pressure, horizontal force, bending moment, etc.) to the foundation. The mechanical nature of the displacement of the steel bearing platform is actually the imbalance between the external load and the reaction force of the foundation. Since the test of the Electric Power Research Institute (EPRI) shows that the horizontal stiffness of the four-anchor linkage system is only increased by 15% compared with the independent anchor rod, in the general understanding, the synergistic effect between the single screw anchors is limited, and therefore in the existing technology, the displacement problem of the steel bearing platform is mainly focused on the bearing capacity and uplift performance of the single anchor, and the optimization of the overall synergistic effect of the overhead transmission line tower foundation is rarely considered.

[0061] In view of the defects of the prior art, the utility model provides a rigid connection device 2 for realizing the rigid connection between the single-anchor foundations of screw anchors, which is located at a position of 0.5 m below the ground level 0.00, after four single screw anchors 1 are screwed into the soil, a ditch is excavated between the single screw anchors 1, then the rigid connection device 2 is fastened between the four single screw anchors 1 to form a rigid connection, and finally the original soil is backfilled to complete the construction.

[0062] In combination with Figures 4-7 As shown in FIG. 1, the rigid connection device comprises a hoop 21, a connecting plate fixedly combined with the outer circumferential surface of the hoop 21, and a connecting rod 22.

[0063] The hoop 21 comprises two hoop profiles which are spliced to form a hoop shape and are coaxially arranged with the anchor rod 11 and configured to be sleeved on the anchor rod 11 of the single screw anchor 1.

[0064] The direction of the opening 210 formed between the two hoop profiles is perpendicular to the center direction of the tower site.

[0065] The connecting plate is fixedly combined with the outer surface of one of the two hoop profiles, which faces the space enclosed by the plurality of single screw anchors 1. The connecting plate comprises a first connecting plate 23 and a second connecting plate 24, which are arranged at an angle therebetween, and the middle line of the included angle a between the first connecting plate 23 and the second connecting plate 24 passes through the center O of the tower site. Figure 5 The midpoint dash line passes through the center O of the tower site.

[0066] The connecting rod 22 is fixedly combined with the first connecting plate 23, and the second connecting plate 24 is configured to be fixedly combined with the connecting rod 22 of the rigid connecting device 2 of the adjacent single-anchor foundation of the spiral anchor, so that the plurality of single-anchor foundations of the spiral anchor constituting the foundation of the overhead transmission line tower can be rigidly connected in a head-to-tail manner.

[0067] In one specific embodiment, as shown in Figure 5 The hoop profile includes a semi-circular hoop body 211 and connecting ears 212 on both sides of the hoop body 211. The hoop profile is made of steel plate by folding and welding, and the material is selected from Q235B or Q355B.

[0068] In this embodiment, the end portions of the first connecting plate 23 and the second connecting plate 24 are fixedly welded to the outer circumferential surface of the hoop body 211, and the reverse extension lines of the first connecting plate 23 and the second connecting plate 24 converge on the central axis of the hoop body 211.

[0069] In one specific example, the first connecting plate 23 and the second connecting plate 24 are symmetrically arranged, and the shapes and thicknesses of the two are the same. For example, the thicknesses of the first connecting plate 23 and the second connecting plate 24 are both 10-12 mm. The appropriate thickness design enables the connecting plate to have sufficient carrying capacity when connecting the connecting rod, stably transmits the acting force between the components, ensures firm connection, and further enhances the overall performance of the rigid connecting device 2.

[0070] The connecting ears 212 are provided with connecting holes, and bolts 3 are connected in the connecting holes. The axial direction of the connecting hole is perpendicular to the axial direction of the hoop body 211. As shown in Figure 5 Two parallel bolts 3 are used to connect the connecting ears 212 on the same side of two hoop profiles to adjust the size of the gap between the two hoop bodies 211, so as to fix the hoop 21 on the corresponding anchor rod 11. During construction, the bolts 3 are tightened to tightly hold the anchor rod 11 by the hoop 21, ensuring the tight and reliable connection between the hoop 21 and the anchor rod 11, effectively transmitting the load, and ensuring the stable operation of the entire rigid connecting device 2.

[0071] In one specific embodiment, the inner diameter R of the hoop body 211 is calculated by the following formula:

[0072] R = r + 3 mm

[0073] Wherein, r is the outer diameter of the anchor rod 11 connected by the hoop 21.

[0074] The inner diameter design not only facilitates the fastening connection of the hoop 21 with the anchor rod 11 after the construction of the anchor rod 11 is completed, but also ensures that the hoop 21 and the anchor rod 11 have appropriate holding force, avoids the hoop 21 from shaking or falling off the anchor rod 11, and effectively enhances the stability of the connection between the rigid connection device 2 and the single helix anchor 1, so as to ensure that the hoop 21 can stably hold the anchor rod 11 under various working conditions, and reduce the displacement risk.

[0075] In a specific embodiment, the hoop profile is made of steel plate by folding and welding, that is, the thickness of the hoop body 211 and the connecting lug 212 is the same. In this embodiment, the thickness of the hoop body 211 and the connecting lug 212 is 8-12 mm, which can ensure the strength of the hoop 21 while taking into account the material cost and processing difficulty, so as to ensure that the hoop 21 is not easy to deform or damage when bearing external force, thereby ensuring the reliability of the entire rigid connection device 2.

[0076] In a specific embodiment, as shown in Figures 4-5 The hoop body 211 and the connecting lug 212 of one hoop profile without the mounting plate are fixed with the stiffening rib 213, and the plate thickness of the stiffening rib 213 is 8 mm, which plays a reinforcing role and can enhance the structural strength of the hoop profile, so that the hoop 21 can maintain good structural integrity when holding the anchor rod 11 and bearing external force, reduce the risk of local deformation of the hoop 21, and further improve the stability of the rigid connection device 2.

[0077] In a specific embodiment, as shown in Figures 4-5 The rigid connection device 2 further includes a first stiffening plate 25 fixed between the first connecting plate 23 and the hoop 21, and a second stiffening plate 26 fixed between the second connecting plate 24 and the hoop 21.

[0078] In this embodiment, one end of the first stiffening plate 25 is combined and fixed with the end of the first connecting plate 23 away from the hoop 21, and the other end is combined and fixed with the connecting lug 212 of the hoop profile close to the first connecting plate 23, forming a triangular stable structure. The thickness of the first stiffening plate 25 is 10-12 mm, and the main role of the first stiffening plate 25 is to strengthen the first connecting plate 23, which can effectively improve the anti-deformation ability of the first connecting plate 23 in the actual stress process, prevent the first connecting plate 23 from bending or breaking when bearing large load, thereby ensuring the reliability and stability of the entire rigid connection device 2 and prolonging the service life of the rigid connection device 2.

[0079] Correspondingly, one end of the second stiffening plate 26 is combined and fixed with the end of the second connecting plate 24 away from the hoop 21, and the other end is combined and fixed with the connecting lug 212 of the hoop profile where the connecting plate is located, close to the second connecting plate 24, forming a triangular stable structure. The thickness of the second stiffening plate 26 is 10-12mm. The main function of the second stiffening plate 26 is to strengthen the second connecting plate 24. In the actual stress process, the second connecting plate 24 can effectively improve the anti-deformation ability, prevent the second connecting plate 24 from bending or breaking when bearing a large load, thereby ensuring the reliability and stability of the entire rigid connecting device 2, and prolonging the service life of the rigid connecting device 2.

[0080] In a specific embodiment, as shown in Figure 6 A plurality of fixing holes 20 are formed in the first connecting plate 23 and the second connecting plate 24, as shown in Figure 5 The first connecting plate 23 and the connecting rod 22 are connected by the fixing bolt 4, and the second connecting plate 24 and the connecting rod 22 of the rigid connecting device of the adjacent single-anchor foundation of the spiral anchor are connected, so that the plurality of single-anchor foundations of the spiral anchor constituting the overhead transmission line tower foundation can be connected end to end in a rigid manner.

[0081] In a specific embodiment, in order to ensure the structural strength of the rigid connecting device 2, the connecting rod 22 is preferably a steel pipe or a round steel.

[0082] In an embodiment, the hoop 21, the connecting plate, the connecting rod 22, the stiffening rib 213, the first stiffening plate 25 and the second stiffening plate 26 are all hot-dip galvanized steel materials. The hot-dip galvanizing process can form a dense zinc layer on the surface of the steel part, effectively preventing the steel part from being corroded during long-term use, prolonging the service life of the rigid connecting device 2, meeting the safety period requirement of the project, reducing the later maintenance cost, and improving the reliability and stability of the entire overhead transmission line tower foundation.

[0083] Another embodiment of the utility model provides a single-anchor foundation of a spiral anchor, which is combined with Figure 8 As shown in the figure, the single-anchor foundation of the spiral anchor comprises a single spiral anchor 1 and the rigid connecting device 2 provided in the above embodiment. The rigid connecting device 2 is combined and fixed on the anchor rod 11 of the single spiral anchor 1 through the hoop 21 and is located at a position close to the top end of the anchor rod 11.

[0084] During construction, the single spiral anchor 1 comprises two rotating modes, vertical rotation and inclined rotation, Figure 8 Fig. a is a structural schematic view of the rigid connecting device 2 configured on the single spiral anchor 1 in the vertical rotation mode, and Fig. b is a structural schematic view of the rigid connecting device 2 configured on the single spiral anchor 1 in the inclined rotation mode. Figure 8It can be seen that, no matter the single helix anchor 1 is vertically rotated into the ground or is obliquely rotated into the ground, the first connecting plate 23 and the second connecting plate 24 of the rigid connecting device 2 corresponding to the single helix anchor 1 are both arranged perpendicularly to the horizontal ground.

[0085] In a specific embodiment, the angle β between the first connecting plate 23 and the central axis of the hoop 21 changes with the angle at which the anchor rod 11 is rotated into the ground. Specifically, the angle β between the first connecting plate 23 and the central axis of the hoop 21 is equal to the angle γ between the central axis of the anchor rod 11 and the horizontal ground. When the single helix anchor 1 is vertically rotated into the ground, the first connecting plate 23 is welded and fixed to the outer circumferential surface of the hoop 21 along the radial direction of the hoop 21.

[0086] Similarly, the second connecting plate 24, specifically, the angle between the second connecting plate 24 and the central axis of the hoop 21 changes with the angle at which the anchor rod 11 is rotated into the ground. Specifically, the angle between the second connecting plate 24 and the central axis of the hoop 21 is equal to the angle γ between the central axis of the anchor rod 11 and the horizontal ground. When the single helix anchor 1 is vertically rotated into the ground, the second connecting plate 24 is welded and fixed to the outer circumferential surface of the hoop 21 along the radial direction of the hoop 21.

[0087] Another embodiment of the utility model provides a kind of overhead transmission line tower foundation, as shown in figure Figures 9-10 Four single helix anchor foundations 100 provided by the above embodiment are arranged in square structure or matrix structure, and the single helix anchors 1 of the four single helix anchor foundations 100 are rigidly connected by the rigid connecting device 2. The angle between the first connecting plate 23 and the second connecting plate 24 located in the same single helix anchor foundation 100 is 90°. It should be noted that the angle between the first connecting plate 23 and the second connecting plate 24 located in the same single helix anchor foundation 100 is affected by the number and arrangement structure of the single helix anchor foundation 100, and can be adjusted according to actual conditions.

[0088] The overall connection mode of the overhead transmission line tower foundation is as follows: during foundation construction, after four single helix anchors 1 are rotated into the soil, a trench is excavated between the single helix anchors 1 at a position 0.5 m below the ground level, and the trench is in square or rectangular shape. The hoop 21 is installed on the single helix anchor 1, the direction of the opening formed between the two hoop profiles is perpendicular to the center direction of the tower site, the hoop 21 is fastened using the bolt 3, the connecting rod member 22 (such as a steel pipe or a round steel) is installed on the connecting plate of the hoop 21, the single helix anchor 1, the hoop 21, the connecting plate, and the connecting rod member 22 form a whole rigid connecting device, and after the installation and fastening of the connecting device are completed, the trench is backfilled with undisturbed soil.

[0089] It should be noted that when the single helix anchor 1 is inclined to rotate, the inclined direction should point to the tower position center or be located on the reverse extension line of the tower position center. When the single helix anchor inclined to rotate points to the tower position center O or is located on the reverse extension line of the tower position center, the axis is in a collinear or small angle relationship with the tower leg force transmission direction, so that the horizontal load (such as wind load) is converted into axial tension through the inclination angle between the anchor rods, the bending moment component is reduced, and the uplift efficiency is improved.

[0090] In the overhead power transmission line tower foundation provided by the embodiment of the utility model, four single helix anchors are connected to form a closed square frame structure through the rigid connecting device, the originally independent anchor fixing points are integrated into a spatial steel frame structure, uniform distribution of load can be realized, single-point stress concentration can be avoided, horizontal torque and eccentric load can be resisted through the overall geometric stability, and the axial stiffness and bending resistance of the connecting rod are used to convert local deformation into cooperative deformation of the overall structure.

[0091] In addition, the four single helix anchors are connected through the rigid connecting device, the truss effect can be formed, the lateral displacement of the top of the anchor rod is limited, 80% of the horizontal load is converted into the axial force of the formed closed direction frame structure through the design of the embodiment, and the shear resistance of the steel bearing platform in the prior art is used to offset the horizontal load, so that the displacement of the steel bearing platform can be avoided, the bending moment generated by the asymmetric load can be internally offset, and the cumulative plastic deformation at the connection point of the anchor rod and the steel bearing platform can be avoided, so that the adverse displacement of the steel bearing platform can be avoided.

[0092] Since the rigid connecting device is located at 0.5m below the ground surface ±0.00, and the original soil needs to be backfilled after installation, the passive resistance of the soil can be fully utilized to form an effect similar to a "invisible ground beam", and the friction between the buried connecting rod and the surrounding soil makes the soil mechanically stop the formed square frame structure, physically limits the movement space of the steel bearing platform, and enhances the anti-sliding ability of the single helix anchor. In addition, it can also play an environmental isolation role, avoiding the influence of sudden changes in surface temperature on steel deformation. When the temperature difference ΔT is 30℃, the free expansion amount of 10m long steel is 3.6mm, and after being buried, the soil constraint can reduce it to 0.5mm.

[0093] The rigid connecting device, the single-anchor foundation of the screw anchor and the overhead transmission line tower foundation provided by the embodiment of the utility model change the traditional passive displacement resistance idea into the wisdom of active load path guidance through the design of soft against hard, and embody the essence of modern geotechnical engineering of "going with the flow". Through finite element analysis, the rigid connecting device provided by the utility model coordinates the deformation between single screw anchors, so that the horizontal stiffness of the four-anchor linkage system is increased by 30-50% than that of the independent anchor rod, and the displacement of the steel bearing platform is reduced by 20-40%. The four single screw anchors are connected by the rigid connecting device to form a closed square frame structure, which can form an overturning couple and improve the overturning coefficient of the overhead transmission line tower foundation by 1.2-1.5 times.

[0094] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the implementation mode of the utility model. For the ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description, and all the implementation modes cannot be exhausted here. Any change or variation derived from the technical solution of the utility model still falls within the protection scope of the utility model.

Claims

1. A rigid connection device for rigid connection between screw anchor monopile foundations, characterized in that, The rigid connecting device comprises: a hoop, a connecting plate fixedly combined with the outer circumferential surface of the hoop, and a connecting rod; the hoop comprises two hoop profiles which are spliced to form a hoop shape and are coaxially arranged on the anchor rod of the single helical anchor; the direction of the opening formed between the two hoop profiles is perpendicular to the center direction of the tower site; the connecting plate is fixedly combined with the outer surface of one of the two hoop profiles, the connecting plate comprises a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are arranged at an angle, and the middle line of the included angle between the first connecting plate and the second connecting plate passes through the center of the tower site; the connecting rod is fixedly combined with the first connecting plate, and the second connecting plate is configured to be fixedly combined with the connecting rod of the rigid connecting device of the adjacent single-anchor foundation of the helical anchor.

2. The rigid connection device of claim 1, wherein, the hoop profile comprises a hoop body in the shape of a semicircular ring, and connecting ears located on both sides of the hoop body, the end portions of the first connecting plate and the second connecting plate are fixedly combined with the outer circumferential surface of the hoop body, and the reverse extension lines of the first connecting plate and the second connecting plate converge on the central axis of the hoop body; the connecting ears are provided with connecting holes, and bolts are connected in the connecting holes, and the axial direction of the connecting holes is perpendicular to the axial direction of the hoop body; two hoop profiles are connected by two parallel bolts to adjust the size of the opening between the two hoop bodies and fix the hoop on the anchor rod.

3. The rigid connection device of claim 2, wherein, the inner diameter R of the hoop body is calculated by the following formula: R = r + 3mm wherein r is the outer diameter of the anchor rod connected by the hoop.

4. The rigid connection device of claim 2, wherein, a stiffening rib is fixed between the hoop body and the connecting ear of the other hoop profile; the thickness of the hoop body and the connecting ear is the same, which is 8-12mm, and the thickness of the stiffening rib is 8mm.

5. The rigid connection device of claim 2, wherein, the rigid connecting device further comprises a first stiffening plate fixed between the first connecting plate and the hoop, and a second stiffening plate fixed between the second connecting plate and the hoop; one end of the first stiffening plate is fixedly combined with the end of the first connecting plate away from the hoop, and the other end is fixedly combined with the connecting ear of the hoop profile where the connecting plate is located and close to the first connecting plate; one end of the second stiffening plate is fixedly combined with the end of the second connecting plate away from the hoop, and the other end is fixedly combined with the connecting ear of the hoop profile where the connecting plate is located and close to the second connecting plate; the thickness of the first connecting plate and the second connecting plate is the same, which is 10-12mm; the thickness of the first stiffening plate and the second stiffening plate is the same, which is 10-12mm.

6. The rigid connection device of claim 1, wherein, a plurality of fixing holes are arranged on the first connecting plate and the second connecting plate, and the first connecting plate and the connecting rod and the second connecting plate and the connecting rod of the rigid connecting device of the adjacent single-anchor foundation of the helical anchor are connected by fixing bolts.

7. The rigid connection device of claim 1, wherein, the hoop, the connecting plate and the connecting rod are all made of hot-dip galvanized steel material.

8. A screw anchor single anchor foundation, characterized in that the single helical anchor and the rigid connecting device according to any one of claims 1-7 are comprised; the rigid connecting device is fixedly combined with the anchor rod of the single helical anchor by the hoop.

9. A screw anchor single pile foundation according to claim 8, c h a r a c t e r i s e d in that the angle between the first connection plate and the central axis of the clamp changes with the angle of the anchor rod into the ground; the angle between the first connection plate and the central axis of the clamp is equal to the angle between the central axis of the anchor rod and the horizontal ground; the angle between the second connection plate and the central axis of the clamp is equal to the angle between the central axis of the anchor rod and the horizontal ground.

10. An overhead power transmission line tower foundation, characterized by, the four single helix anchor foundations are arranged in a rectangular structure, and the single helix anchors of the four single helix anchor foundations are rigidly connected by the rigid connection device; the angle between the first connection plate and the second connection plate of the same single helix anchor foundation is 90°.

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