Fabricated foundation for large-diameter steel pipe pole and construction method thereof

Abstract

The invention belongs to the technical field of power transmission tower foundations, and provides a fabricated foundation for a large-diameter steel pipe pole and a construction method of the fabricated foundation. The prefabricated body comprises a plurality of prefabricated blocks, U-shaped steel bars are arranged among the prefabricated blocks, and the anti-seismic property of the foundation is improved through gaps between the adjacent prefabricated blocks; on the basis, the assembly auxiliary plate is arranged, the limiting holes in the two ends of the plate body correspond to the bolt connecting holes in the two adjacent precast blocks in number and position, when the precast blocks are assembled on site, foundation bolts can be arranged in the limiting holes and the bolt connecting holes in advance, and the dislocation problem occurring when the precast blocks are assembled on site is avoided; the problem that after the precast blocks are staggered, the bolt connecting holes and the radial steel pipe rods are staggered, and foundation bolts cannot be installed is solved, meanwhile, the end of the pile body is connected to the gap between every two adjacent precast blocks, certain installation errors exist between the pile body and the precast blocks, and the field assembly difficulty is lowered.

Description

Technical Field

[0001] The invention belongs to the technical field of transmission tower foundations, and in particular relates to an assembled foundation for a large-diameter steel pipe pole and a construction method thereof. Background Art

[0002] Concrete foundations are difficult to adapt to the current development of power transmission line construction due to their long construction period, high labor costs, and dependence on geological conditions. Large diameter steel pipe pole foundation, also known as steel pipe pole or steel pipe tower, is a tower structure used for power transmission and distribution. It has multiple advantages, including: strong bearing capacity, design flexibility, high construction efficiency, easy transportation and installation, good anti-corrosion performance, long-term cost-effectiveness, and suitable for a variety of environments.

[0003] In modern power transmission and communication networks, steel pipe poles are widely used due to their excellent bearing capacity and corrosion resistance. However, the installation of large-diameter steel pipe poles usually requires large machinery and complex on-site operations, resulting in long construction periods, high costs and great environmental impacts. With the help of prefabricated foundations, the construction efficiency of on-site installation of large-diameter steel pipe poles can be improved, and related costs can be reduced. However, the current prefabricated foundations are characterized by large assembly parts, which are still difficult to transport and install on site, and the overall seismic effect of the foundation is poor. The main reason why the current prefabricated foundations are characterized by large assembly parts is that if the assembly parts are set as a large number of small volume blocks, although it is convenient to transport and reduce the difficulty of on-site assembly, it is easy to misalign adjacent assembly parts during the assembly process, which makes it difficult to connect and fix the assembly parts, and even causes problems that cannot be installed. Summary of the invention

[0004] In order to solve the above-mentioned problems, the present invention proposes an assembled foundation for large-diameter steel pipe rods and a construction method thereof. The prefabricated body includes multiple prefabricated blocks, and the seismic resistance of the foundation is improved by the gaps between adjacent prefabricated blocks. On this basis, an assembly auxiliary plate is provided, and the limiting holes at both ends of the plate body respectively correspond to the number and positions of the bolt connection holes on the two adjacent prefabricated blocks. When the prefabricated blocks are assembled on site, the anchor bolts can be set in the limiting holes and the bolt connection holes in advance to avoid the misalignment problem that occurs when the prefabricated blocks are assembled on site. At the same time, the end of the pile body is connected to the gap between the two adjacent prefabricated blocks, so that a certain installation error is allowed between the pile body and the prefabricated blocks, thereby reducing the difficulty of on-site assembly.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention provides an assembled foundation for large-diameter steel pipe rods, which adopts the following technical solution:

[0006] An assembled foundation for large-diameter steel pipe rods, comprising a prefabricated body, a pile body, anchor bolts and an assembly auxiliary plate;

[0007] The prefabricated body comprises a plurality of prefabricated blocks, each of which is provided with a bolt connection hole matched with the anchor bolt, and both sides of the prefabricated block are provided with a U-shaped steel bar;

[0008] The assembly auxiliary plate includes a plate body and limiting holes arranged at both ends of the plate body; the limiting holes at both ends of the plate body respectively correspond to the number and positions of the bolt connection holes on two adjacent prefabricated blocks; the end of the pile body is connected to the gap between two adjacent prefabricated blocks.

[0009] Furthermore, the cross section of the prefabricated block is a trapezoidal cross section; U-shaped steel bars are respectively provided at both ends of both sides of the prefabricated block.

[0010] Furthermore, a plurality of bolt connection holes are provided on the prefabricated block at one end close to the lower bottom of the trapezoidal cross section.

[0011] Furthermore, arc grooves are provided on both sides of the prefabricated block; and the diameter of the circle where the arc grooves are located is greater than the diameter of the pile body.

[0012] Furthermore, concrete is poured into the gaps between adjacent prefabricated blocks.

[0013] Furthermore, the pile body includes a pile shaft and steel bars arranged at the ends of the pile shaft; and connecting parts corresponding to the steel bars are pre-embedded on both sides of the prefabricated block.

[0014] Furthermore, one end of the pile body is detachably provided with a pile driving head, and the other end is sleeved with a positioning tube; the pile driving head is a cylindrical structure; the positioning tube includes a base for contacting the ground, a tube body arranged on the base, and a plurality of reinforcing ribs arranged between the base and the tube body, the outer diameter of the base is larger than the outer diameter of the tube body, and the inner diameter of the base is equal to the inner diameter of the tube body.

[0015] Furthermore, the anchor bolt includes a stud and a bolt head arranged at the end of the stud.

[0016] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a method for constructing an assembled foundation for large-diameter steel pipe rods, which adopts the following technical solution:

[0017] A method for constructing an assembled foundation for large-diameter steel pipe rods uses the assembled foundation for large-diameter steel pipe rods as described in the first aspect, comprising: setting a plurality of pile bodies in the ground at preset positions by hammering; setting an assembly auxiliary plate on two adjacent prefabricated blocks, and setting anchor bolts in bolt connection holes and limit holes; connecting the two prefabricated blocks by U-shaped steel bars, and connecting the ends of the pile bodies to the gaps between the two prefabricated blocks; continuing to add prefabricated blocks to one of the prefabricated blocks by adding assembly auxiliary plates until all prefabricated blocks are connected and all pile bodies are connected to the corresponding gaps; removing all assembly auxiliary plates, and connecting the prefabricated blocks to flanges on the steel pipe rods by delivery bolts.

[0018] Furthermore, before the pile body is hammered, the positioning tube is set at a preset position on the ground, and the pile hammering head is set at the hammering end of the pile body; the pile body is inserted into the positioning tube for hammering; after hammering, the positioning tube is removed for assembly of prefabricated blocks.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, the prefabricated body includes a plurality of prefabricated blocks, and the plurality of prefabricated blocks are connected by U-shaped steel bars, and the gaps between adjacent prefabricated blocks improve the seismic resistance of the foundation; on this basis, an assembly auxiliary plate is provided, and the limiting holes at both ends of the plate body respectively correspond to the number and positions of the bolt connection holes on the two adjacent prefabricated blocks. When the prefabricated blocks are assembled on site, the anchor bolts can be arranged in the limiting holes and the bolt connection holes in advance, so as to avoid the misalignment problem when the prefabricated blocks are assembled on site, and solve the problem that the bolt connection holes and the diameter steel pipe rods are misaligned after the prefabricated blocks are misaligned and the anchor bolts cannot be installed. At the same time, the end of the pile body is connected to the gap between the two adjacent prefabricated blocks, so that a certain installation error is allowed between the pile body and the prefabricated blocks, thereby reducing the difficulty of on-site assembly.

[0021] 2. The present invention provides a positioning cylinder. Before the pile body is hammered down, the pile body is inserted into the pre-placed positioning cylinder. This can ensure to a certain extent that the verticality of the pile body entering the soil is reduced, thereby avoiding the problem that the pile body cannot be smoothly assembled with the prefabricated block when the inclination is too large. At the same time, it can avoid the problem of misalignment between the prefabricated blocks when the pile body is assembled with the prefabricated blocks when the inclination is too large.

[0022] 3 The present invention can reduce the difficulty of assembly by arranging the pile body in the gap between the prefabricated blocks, limiting the position of the pile body when hammering by the positioning cylinder, arranging the arc grooves on both sides of the prefabricated blocks and comprehensively arranging the assembly auxiliary plates, so as to solve the problem that the anchor bolts and the like cannot be accurately installed when the relative positions of the assembly blocks are misaligned due to unstable force or the influence of the filling process during the connection process between the pile body, the prefabricated blocks and the steel pipe rod. At the same time, the gap setting of the assembly blocks has a certain earthquake resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0024] Figure 1 This is a schematic diagram of the basic structure of Example 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the preform structure of Example 1 of the present invention;

[0026] Figure 3 This is a schematic diagram of the prefabricated block structure of Example 1 of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of an assembly auxiliary plate according to Embodiment 1 of the present invention;

[0028] Figure 5 This is a schematic diagram of the pile structure of Example 1 of the present invention;

[0029] Figure 6 This is a schematic diagram of the pile-driving head structure of Embodiment 1 of the present invention;

[0030] Figure 7 This is a schematic diagram of the positioning tube structure of Example 1 of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the anchor bolt according to Embodiment 1 of the present invention;

[0032] Among them, 1. prefabricated body; 101. prefabricated block; 102. bolt connection hole; 103. assembly auxiliary plate; 1031. plate body; 1032. limit hole; 104. arc groove; 2. pile body; 201. pile body; 202. steel bar; 203. pile head; 204. positioning tube; 2041. tube body; 2042. base; 2043. reinforcement rib; 3. anchor bolt; 301. stud; 302. bolt head; 4. U-shaped steel bar. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0035] Large diameter steel pipe pole, also known as steel pipe pole or steel pipe tower; the outer diameter of large diameter steel pipe pole ranges from 406.4mm to 12m, and the wall thickness ranges from 6mm to 100mm.

[0036] Embodiment 1:

[0037] As described in the background technology, the main reason why the assembled parts of the current prefabricated foundation are large is that if the assembled parts are set as a large number of small blocks, although it is convenient for transportation and reduces the difficulty of on-site assembly, it is easy to misalign the adjacent assembled parts during the assembly process, making it difficult to connect and fix the assembled parts, or even causing the problem of being unable to install. Based on this, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides an assembled foundation for large-diameter steel pipe rods, including a prefabricated body 1, a pile body 2, anchor bolts 3 and an assembly auxiliary plate 103;

[0038] like Figure 2 and Figure 3 As shown, the prefabricated body 1 includes a plurality of prefabricated blocks 101, each of which is provided with a bolt connection hole 102 that matches the anchor bolt 3, and both sides of the prefabricated block 101 are provided with a U-shaped steel bar 4;

[0039] like Figure 4 As shown, the assembly auxiliary plate 103 includes a plate body 1031 and limiting holes 1032 arranged at both ends of the plate body 1031; the limiting holes 1032 at both ends of the plate body 1031 respectively correspond to the number and positions of the bolt connection holes 102 on two adjacent prefabricated blocks 101; the end of the pile body 2 is connected to the gap between two adjacent prefabricated blocks 101.

[0040] Specifically, U-shaped steel bars 4 are passed between multiple prefabricated blocks 101, and the gaps between adjacent prefabricated blocks 101 improve the seismic resistance of the foundation; on this basis, an assembly auxiliary plate 103 is set, and the limiting holes 1032 at both ends of the plate body 1031 respectively correspond to the number and positions of the bolt connection holes 102 on the two adjacent prefabricated blocks 101. When the prefabricated blocks 101 are assembled on site, the anchor bolts 3 can be set in the limiting holes 1032 and the bolt connection holes 102 in advance to avoid the misalignment problem that occurs when the prefabricated blocks 101 are assembled on site, and the problem that the bolt connection holes 102 and the diameter steel pipe rods are misaligned after the prefabricated blocks 101 are misaligned and the anchor bolts cannot be installed is solved. At the same time, the end of the pile body 2 is connected to the gap between the two adjacent prefabricated blocks 101, allowing a certain installation error between the pile body 2 and the prefabricated blocks 101, thereby reducing the difficulty of on-site assembly.

[0041] In view of the problems that the steel plate type foundation and the steel bottom plate-screw anchor combination foundation currently used in the foundation of the transmission tower are high in cost, low in rigidity and easy to deform, in this embodiment, the prefabricated body 1 and the pile body 2 are partially made of prefabricated components, and the prefabricated body 1 includes a plurality of prefabricated blocks 101, which avoids on-site casting, improves the stability of the foundation and reduces the foundation cost while shortening the construction period.

[0042] In order to ensure that the large-diameter steel pipe rod foundation is accurately connected to the upper structure, an assembly auxiliary plate 103 is made according to the flange hole of the upper large-diameter steel pipe. The position of each component is adjusted during the construction process to ensure that the error between each prefabricated block 101 does not exceed 50mm. Optionally, a gap is left between the prefabricated blocks 101 as a post-casting strip, and the width of the post-casting strip can be selected to be 200mm-300mm, and the allowable construction error is relatively large. The upper steel bars 202 of the prefabricated pile body 2 extend into the gap between the prefabricated blocks 101. Small-diameter pipe piles are used, the pile diameter is 300mm-400mm, and the distance between the steel bars 202 is 100mm-150mm. The joint width between the prefabricated blocks 101 is 200mm-300mm, and the horizontal position of the pile body 2 allows a construction error of about 100mm. During the construction of the pile body 2, a positioning cylinder 204 can be added to reduce the construction error of the horizontal position of the pile body 2; after the construction of the pile body 2, if there is an elevation error, it is leveled through a 50mm post-plain concrete cushion.

[0043] Optionally, the prefabricated body 1 includes nine prefabricated blocks 101 of trapezoidal concrete reinforced steel structure. The prefabricated blocks 101 are prefabricated in a factory and tied and connected by U-shaped steel bars 4. There are gaps between the components, and the gaps and the spaces in between are cast on site.

[0044] like Figure 2 and Figure 3 As shown, the cross section of the prefabricated block 101 is a trapezoidal cross section; U-shaped steel bars 4 are respectively provided at both ends of both sides of the prefabricated block 101. Optionally, the prefabricated block 101 is prefabricated in a factory and transported to the site for assembly. The U-shaped steel bars 4 can be prefabricated in the prefabricated block 101. The cross section of the prefabricated block 101 is set to a trapezoidal cross section, which can ensure the gap between the prefabricated blocks 101 and the gap in the middle of the prefabricated body 1; after the on-site assembly, concrete is poured into the gap. By distinguishing between prefabricated materials and pouring materials, and different prefabrication times, the gap in the prefabricated body 1 can be allowed to have a certain earthquake resistance effect.

[0045] like Figure 2As shown, the prefabricated block 101 is provided with a plurality of bolt connection holes 102 at one end near the lower bottom of the trapezoidal cross section. The prefabricated block 101 is provided with arc grooves 104 on both sides; the diameter of the circle where the arc grooves 104 are located is larger than the diameter of the pile body 2. Specifically, the diameter of the circle where the arc grooves 104 are located is larger than the diameter of the pile body 2, which can meet the installation requirements when the pile body 2 has a certain inclination due to unstable force under hammering, reduces the impact on the prefabricated block 101, and avoids the misalignment between adjacent prefabricated blocks 101.

[0046] On this basis, if Figure 5 As shown, the pile body 2 includes a pile body 201 and a steel bar 202 arranged at the end of the pile body 201; connecting parts corresponding to the steel bars 202 are pre-embedded on both sides of the prefabricated block 101, such as pre-embedded steel bars; when pouring concrete in the gap between adjacent prefabricated blocks 101, the pile body 2 is connected to the prefabricated block 101 through the steel bars 202, and the steel bars 202 are poured into the concrete. Regardless of whether the pile body 2 is vertical or inclined, as long as it is arranged in the arc groove 104, the connection strength between the pile body 2 and the prefabricated body 1 can be guaranteed.

[0047] like Figure 6 and Figure 7 As shown, one end of the pile body 2 is detachably provided with a pile head 203, and the other end is sleeved with a positioning tube 204. Specifically, before the pile body 2 is hammered, the positioning tube 204 is set at a preset position on the ground, and the pile head 203 is set at the hammering end of the pile body 2 to protect the pile body 2 from deformation during the hammering process; the pile body 2 is sleeved in the positioning tube 204 for hammering to ensure the verticality of the pile body 2 after hammering; after hammering, the positioning tube 204 is removed to assemble the prefabricated block 101.

[0048] The pile driving head 203 is a cylindrical structure; the positioning tube 204 includes a base 2042 for contacting the ground, a tube body 2041 arranged on the base 2042, and a plurality of reinforcing ribs 2043 arranged between the base 2042 and the tube body 2041. The outer diameter of the base 2042 is greater than the outer diameter of the tube body 2041, and the inner diameter of the base 2042 is equal to the inner diameter of the tube body 2041; the outer diameter of the base 2042 is greater than the outer diameter of the tube body 2041, which ensures the stability of the positioning tube 204 and prevents the positioning tube 204 from moving during the hammering process.

[0049] The steel bar 202 is embedded in the pile body 2, and the steel bar 202 extends out of the pile body 2 and is connected to the prefabricated block 101. The pile body 2 is first driven into the foundation through the positioning tube 204 for positioning. When hammering, the pile head 203 is added to the top of the pile body 2 to prevent the steel bar 202 from being damaged during the hammering process. The prefabricated block 101 is installed at the position corresponding to the pile body 2. After being connected by the steel bar 202, high-strength concrete is poured to connect the steel bars to improve the bearing capacity of the pile. After the U-shaped steel bar 4 is tied, the nine prefabricated blocks 101 become a whole, and the middle part is grouted on site.

[0050] like Figure 8 As shown, in order to enhance the bearing capacity, the bottom of the anchor bolt 3 is provided with a circular bottom plate. The anchor bolt 3 includes a stud 301 and a bolt head 302 arranged at the end of the stud 301; it can be understood that a groove corresponding to the bolt head 302 is provided on the bolt connection hole 102 to ensure the stability and beauty of the connection; the flange on the steel pipe rod is provided with a connection hole corresponding to the bolt connection hole 102, and the anchor bolt 3 is fixed by a nut after passing through the bolt connection hole 102 and the connection hole.

[0051] Embodiment 2:

[0052] The present embodiment provides a method for constructing an assembled foundation for large-diameter steel pipe rods, using the assembled foundation for large-diameter steel pipe rods as described in Example 1, including: setting a positioning tube at a preset position on the ground, and setting a pile head at the hammering end of the pile body; inserting the pile body into the positioning tube for hammering; and removing the positioning tube after hammering to assemble the prefabricated blocks.

[0053] A plurality of pile bodies are set in the ground at preset positions by hammering; an assembly auxiliary plate is set on two adjacent prefabricated blocks, and anchor bolts are set in bolt connection holes and limit holes; the two prefabricated blocks are connected by U-shaped steel bars, and the ends of the pile bodies are connected to the gap between the two prefabricated blocks; prefabricated blocks are continued to be added to one of the prefabricated blocks by adding assembly auxiliary plates until all prefabricated blocks are connected and all pile bodies are connected to the corresponding gaps; all assembly auxiliary plates are removed, and the prefabricated blocks are connected to the flanges on the steel pipe rods by delivery bolts.

[0054] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. An assembled foundation for large diameter steel pipe rods, characterized in that: It includes prefabricated body, pile body, anchor bolts and assembly auxiliary plate; The prefabricated body comprises a plurality of prefabricated blocks, each of which is provided with a bolt connection hole matched with the anchor bolt, and both sides of the prefabricated block are provided with a U-shaped steel bar; The assembly auxiliary plate includes a plate body and limiting holes arranged at both ends of the plate body; the limiting holes at both ends of the plate body respectively correspond to the number and positions of the bolt connection holes on two adjacent prefabricated blocks; the end of the pile body is connected to the gap between two adjacent prefabricated blocks.

2. The assembled foundation for large diameter steel pipe rods according to claim 1, characterized in that: The cross section of the prefabricated block is a trapezoidal cross section; U-shaped steel bars are respectively arranged at both ends of both sides of the prefabricated block.

3. An assembled foundation for large diameter steel pipe rods as claimed in claim 2, characterized in that: The prefabricated block is provided with a plurality of bolt connection holes at one end close to the lower bottom of the trapezoidal cross section.

4. The assembled foundation for large diameter steel pipe rods according to claim 1, characterized in that: Arc grooves are formed on both sides of the prefabricated block; the diameter of the circle where the arc grooves are located is greater than the diameter of the pile body.

5. The assembled foundation for large diameter steel pipe rods according to claim 4, characterized in that: Concrete is poured into the gaps between adjacent precast blocks.

6. The assembled foundation for large diameter steel pipe rods according to claim 5, characterized in that: The pile body comprises a pile shaft and steel bars arranged at the ends of the pile shaft; connecting parts corresponding to the steel bars are pre-embedded on both sides of the prefabricated block.

7. The assembled foundation for large diameter steel pipe rods according to claim 1, characterized in that: A pile driving head is detachably provided at one end of the pile body, and a positioning tube is sleeved at the other end; the pile driving head is a cylindrical structure; the positioning tube includes a base for contacting the ground, a tube body arranged on the base, and a plurality of reinforcing ribs arranged between the base and the tube body, the outer diameter of the base is larger than the outer diameter of the tube body, and the inner diameter of the base is equal to the inner diameter of the tube body.

8. The assembled foundation for large diameter steel pipe rods according to claim 1, characterized in that: The anchor bolt comprises a stud and a bolt head arranged at the end of the stud.

9. A method for constructing an assembled foundation for large-diameter steel pipe rods, characterized in that: An assembled foundation for large-diameter steel pipe rods as described in any one of claims 1 to 8 is used, comprising: setting a plurality of pile bodies in the ground at preset positions by hammering; setting an assembly auxiliary plate on two adjacent prefabricated blocks, and setting anchor bolts in bolt connection holes and limit holes; connecting the two prefabricated blocks by U-shaped steel bars, and connecting the ends of the pile bodies to the gap between the two prefabricated blocks; continuing to add prefabricated blocks to one of the prefabricated blocks by adding assembly auxiliary plates until all prefabricated blocks are connected and all pile bodies are connected to the corresponding gaps; removing all assembly auxiliary plates, and connecting the prefabricated blocks to the flanges on the steel pipe rods by delivering bolts.

10. A method for constructing an assembled foundation for large diameter steel pipe rods as claimed in claim 9, characterized in that: Before the pile body is hammered, the positioning cylinder is set at a preset position on the ground, and the pile hammering head is set at the hammering end of the pile body; the pile body is sleeved in the positioning cylinder for hammering; after hammering, the positioning cylinder is removed for assembly of prefabricated blocks.

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