Fabricated miniature pile foundation for power transmission line engineering

Abstract

The invention relates to an assembly type micro pile foundation for power transmission line engineering. The assembly type micro pile foundation comprises a first connecting main body, a second connecting main body and micro piles which form a square bearing platform. The first connecting body is a cube with a rectangular groove in the middle and is composed of two identical parts. The second connecting main body is a cube with four bolt holes, and the second connecting main body and the square groove in the middle of the first connecting main body are mutually embedded and spliced. The third connecting main body is a tower foot and is arranged above the second connecting main body, bolt holes in the third connecting main body correspond to bolt holes in the second connecting main body, and the first connecting main body, the second connecting main body and the third connecting main body are fixedly connected through embedded bolts and nuts. The fabricated power transmission line miniature pile foundation is prefabricated in a factory and spliced and assembled on site, the transportation size is small, construction is easy and convenient, the influence on the environment is small, manpower and material resources are saved, transportation is convenient, and full-mechanical construction of power transmission line foundation engineering is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation engineering construction, and in particular to an assembled micro pile foundation for power transmission line engineering and a construction method thereof. Background Art

[0002] Traditional construction technology mainly involves on-site construction, which not only pollutes the environment, but also requires a large amount of manpower. Large machinery is difficult to reach the construction site. At the same time, affected by the construction environment, it is difficult to construct the project in accordance with the specifications, and the quality of the project cannot be guaranteed.

[0003] With the development of society, the country has more and more requirements for power grid construction. All aspects are constantly accelerating and improving, and the quality requirements for construction are getting higher and higher. At present, with the rapid development of society and the rapid growth of labor costs, the State Grid is moving towards the direction of fully mechanized line construction. However, while promoting mechanization, it is necessary not only to improve the convenience of construction, but also to improve the quality of the project and reduce the impact on the environment.

[0004] Compared with the traditional construction process, the cap blocks and micro piles of the assembled micro pile foundation are mass-produced in the factory. The cap blocks, piles and construction tools are small, the environment is not restricted, and they are easy to transport and have guaranteed quality. The cap blocks are prefabricated on site, assembled and connected, and the micro piles are pressed into the foundation soil through the pile holes, realizing mechanized construction throughout the process, saving construction costs, shortening construction period, and reducing pollution to the environment. Summary of the invention

[0005] The purpose of the present invention is to provide an assembled transmission line micropile foundation that realizes fully mechanized construction, so as to address the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the assembled transmission line micro pile foundation designed by the present invention is special in that it includes a first connecting body and a second connecting body constituting a square cap, the first connecting body is a square structure with a square groove in the middle, a screw rod is embedded in the groove and a prestressed tendon reserved channel is left on the two opposite sides, and it is composed of two identical parts assembled and connected to each other, and is connected by pre-embedded screw rods, connecting steel plates and nuts and fixing prestressed tendons. The second connecting body is provided with one, which is distributed in the square groove of the first connecting body, and is connected to the first connecting body by a screw rod. The second connecting body is square as a whole, and a bolt hole is left longitudinally in the middle of the square second connecting body; the first connecting body and the second connecting body are connected by a longitudinal screw rod and a transverse prestressed tendon. The tower foot is directly above the second connecting body, and the screw rod embedded in the first connecting body passes through the second connecting body to reach the bolt hole set in the tower foot and is connected by a nut. The pile body is pressed into the foundation soil section by section through the pile pressing hole, and the top of the pile body is connected and fixed to the first connecting body by a cover plate and a connecting bolt.

[0007] Furthermore, the first connection body is assembled from two first connection components with exactly the same structure, a rectangular groove is provided in the center of the first connection component, a screw is embedded in the groove, and three prestressed tendon reserved channels are provided on the side of the long side end of the first connection component.

[0008] Furthermore, the tower foot is in a cross shape, is placed on the upper surface of the second connection body, and is preset with bolt holes corresponding to the bolt holes of the second connection body.

[0009] Furthermore, the embedded bolt rod of the first connecting body corresponds to the embedded bolt hole of the second body; the transverse reserved prestressed tendon reserved channel of the first connecting body corresponds to the transverse prestressed tendon reserved channel of the second connecting body; the tower foot is placed above the second body, and the embedded screw rod of the first connecting body passes through the second connecting body and is fixed to the tower foot by a nut.

[0010] Furthermore, the second connection body is located in a groove in the middle of the first connection body, and a depth of the groove is half of a height of the first connection body.

[0011] Furthermore, the two first connection members are connected and fixed by top surface embedded bolt rods through connecting pieces and transverse prestressed tendons.

[0012] Furthermore, the prestressed tendon anchoring method can be mechanical anchoring, adhesive anchoring, steel plate anchoring and expansion anchoring, etc.

[0013] Furthermore, the bolt rods embedded in the top surfaces of the two first connecting members are symmetrically arranged along the contact surface.

[0014] Furthermore, the top surface of the first connecting member is provided with four embedded bolts connected to the cover plate, and the four embedded bolts are arranged in a square; the top of the pile body is provided with an embedded bolt sleeve; the cover plate is provided with bolt holes corresponding to the positions of the embedded bolts on the pile top; the cover plate is provided with bolt holes corresponding to the embedded bolts on the top surface of the first connecting member; the embedded screws on the top surface of the first connecting member pass through the corresponding bolt holes on the cover plate and are connected and fixed by nuts; the embedded bolts on the pile top pass through the corresponding bolt holes on the cover plate and are connected and fixed by nuts, thereby realizing the mechanized connection and fixation of the pile and the base.

[0015] Furthermore, the embedded bolts at the pile top are arranged symmetrically on the top surface of the first connecting body, and the specifications and embedding depths of the embedded bolts are consistent. The micro-pile with embedded bolts refers to a pile body frame formed by the pile body longitudinal reinforcement and the pile body stirrups, the embedded bolts are welded to the pile body longitudinal reinforcement, and concrete is poured into the pile body frame.

[0016] Furthermore, the micro piles include square piles, round piles, steel pipe piles, etc. The pile bottom shapes include cross shape, inverted cone shape and flat bottom shape. The pile body and pile bottom are not limited to square piles and flat bottom shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the first connection body.

[0018] Figure 2 Schematic diagram of the first connecting member.

[0019] Figure 3 Schematic diagram of the second connection body.

[0020] Figure 4 This is a schematic diagram after the square base is spliced ​​together.

[0021] Figure 5 This is a schematic diagram of the tower foot.

[0022] Figure 6 This is a schematic diagram of the connection between the tower foot and the pedestal.

[0023] Figure 7 Schematic diagram of the cover plate and micropiles.

[0024] Figure 8 Schematic diagram of other types of micropiles.

[0025] Fig. 9 This is a schematic diagram of the assembled transmission line micropile foundation after splicing is completed.

[0026] In the figure: a first connecting body 1, a first connecting member 1.1, three prestressed tendon reserved channels 1.1.2 in the groove, two first connecting member contact surface end faces with embedded bolts 1.1.3, a middle groove 1.1.4, the first connecting member pile hole end faces with embedded screws 1.1.5, pile holes 1.1.6, the first connecting member is preset with prestressed tendon channels 1.1.7 near the bottom; a second connecting body 2, a longitudinal preset through bolt hole 2.1, a transverse preset prestressed tendon channel 2.2, a third connecting body tower foot 3, a tower foot preset bolt hole 3.1; a micropile 4, embedded bolts 4.1; a micropile connecting steel plate 5; a cap connecting steel plate 6, the first connecting member transversely penetrates the prestressed tendon 7 and fixes the two first connecting members 1.1 through the anchoring end. DETAILED DESCRIPTION

[0027] The present invention is described in more detail below according to the accompanying drawings and specific implementation process: The assembled transmission line micro pile foundation designed by the present invention comprises a first connection body 1 and a second connection body 2 constituting a square cap, wherein the first connection body 1 is a cube with a middle groove, and is assembled by two identical first connection members 1.1 through transverse prestressed tendons and embedded bolts on the contact surface end faces, and fixed by connecting steel plates 6 and nuts, wherein the first connection member 1.1 is provided with a square pile hole 1.1.6, and the second connection body 2 is a cube as a whole, and the second connection body 2 is provided with a longitudinal through bolt hole 2.1 corresponding to the embedded bolt 1.1.1 in the groove of the first connection body; a third connection body 3 tower foot, wherein the third connection body is provided with a bolt hole corresponding to the longitudinal through bolt hole of the second connection body, and the longitudinal embedded bolt in the center groove of the first connection body penetrates the second connection body to reach the third connection body and passes through its preset bolt hole, and is fixed by nuts. The micro pile 4 is pressed into the foundation soil section by section through the pile hole 1.1.6, and the top of the micro pile 4 is connected and fixed to the first connection member 1.1 through the cover plate 5.

[0028] Preferably, the first connecting body 1 includes two first connecting members 1.1 with the same structure, and the first connecting member 1.1 is provided with a groove 1.1.4 near the contact surface side, and a longitudinal embedded bolt 1.1.1 is provided in the groove, and the first connecting member 1.1 is transversely provided with a prestressed tendon channel 1.1.2 that penetrates the groove of the first connecting member, and the first connecting member 1.1 is provided with an embedded bolt rod 1.1.3 near the end face of the contact surface, and the first connecting member is provided with a pile hole 1.1.6, and four embedded bolts 1.1.5 distributed in a square shape are arranged around the pile hole, and the first connecting member is provided with three prestressed tendon reserved channels 1.1.7 near the lower end.

[0029] The second connection body 2 is a square structure, and is provided with bolt holes 2.1 corresponding to the embedded bolts 1.1.1 on the first connection body 1, and the prestressed tendon reserved holes 2.2 corresponding to the prestressed tendon reserved holes 1.1.2 preset on the first connection body 1 are preset.

[0030] Preferably, the groove 1.1.4 of the first connecting member 1.1 is located in the middle of the side wall of the first connecting member, and the depth of the groove 1.1.4 is half of the height of the first connecting member 1.1.

[0031] Preferably, the embedded bolts 1.1.1 of the first connecting member 1.1 are located inside the groove 1.1.4 of the first connecting member, and the embedded bolts 1.1.1 are symmetrically distributed along the first connecting member 1.1.

[0032] Preferably, the three reserved holes 1.1.2 for prestressed tendons of the first connecting member 1.1 are located on the side wall of the groove 1.1.4, and the height of the three reserved holes 1.1.2 for prestressed tendons is half of the depth of the groove 1.1.4.

[0033] Preferably, the three reserved holes 1.1.7 for prestressed tendons of the first connection member 1.1 are located in the lower half of the first connection member 1.1, and the height of the three reserved holes 1.1.7 for prestressed tendons is one quarter of the first connection height.

[0034] Preferably, symmetrical embedded bolts 1.1.3 connected to the connecting steel plate 6 are provided on the upper surfaces of the contacting ends of the two first connecting members 1.1.

[0035] Preferably, the first connecting member 1.1 is provided with two pile-pressing holes 1.1.6.

[0036] Preferably, the top surface of the first connecting member 1.1 is provided with embedded bolts 1.1.5 corresponding to the bolt holes 5.2 of the cover plate 5, and the embedded bolts 1.1.5 on the top surface of the first connecting member 1.1 are arranged in a square.

[0037] The advantages of the present invention are: Less impact on the environment. Compared with the traditional bored pile construction method, the finished product characteristics of micro piles and cap blocks make it unnecessary to store and transport mud during construction, thus reducing the pollution that may be generated during construction. Compared with large excavation foundations, the earthwork volume of micro piles and cap blocks is smaller, and the foundation excavation volume is also reduced accordingly, which reduces the drainage demand and is more conducive to environmental protection. In addition, micro pile machines have the advantages of low energy consumption, no vibration, no noise, and high safety, which is further conducive to protecting the environment of the construction site.

[0038] Using micropiles and cap blocks as the foundation construction method can also improve construction efficiency. Micropiles and cap blocks are both prefabricated reinforced concrete components, which can be mass-produced in advance, and production and maintenance will not take up construction time. The structure of these prefabricated components is symmetrical as a whole, and they are made into assembled components of similar size and weight, which makes later lifting and assembly very convenient and quick. Compared with the traditional bored cast-in-place pile foundation construction method, micropiles are pressed into the soil by anchor rods and jacks, which shortens the construction period and improves the construction efficiency.

[0039] Using micro piles and cap blocks as the foundation construction method can also ensure the reliability of construction quality. Since these components are mass-produced in factories, the quality is stable and reliable. The overall form is symmetrical, the force is evenly distributed, and the pile sinking process is slowly and evenly loaded. There is no impact and reflected stress wave, the impact stress on the pile body is small, and the pile body will not crack, making it easy to control the quality of the project.

[0040] The micro pile foundation construction method is also safer. Since the micro pile foundation pit excavation volume is small, it is not easy to cause collapse, thus reducing the potential safety hazards of construction.

[0041] The cost of micropiles and cap blocks as a foundation construction method is relatively low. Since the components are prefabricated in the factory, the construction process is highly mechanized and requires less manpower and material resources, thus reducing construction costs.

[0042] The above-described embodiments not only illustrate the advantages of micropiles and cap blocks as a foundation construction method, but any modifications or equivalent replacements based on the micropiles should also fall within the scope of protection of this invention.

Claims

1. A transmission line assembled micro pile foundation, characterized in that: The invention comprises a first connection body (1) and a second connection body (2) constituting a cap, wherein the first connection body (1) is composed of two identical parts (1.1) with a rectangular groove (1.1.4) in the middle and pile holes (1.1.6) at both ends, the second connection body (2) having bolt holes corresponding to the embedded bolts of the first connection body (1) in the longitudinal direction and prestressed tendon holes (2.2) corresponding to three prestressed tendon holes in the upper part of the first connection body in the transverse direction, the third connection body (3) having bolt holes corresponding to the embedded bolts of the first connection body (1), the first connection body (1) and the second connection body (2) having bolt holes corresponding to the embedded bolts of the first connection body (1), The connecting body (2) is fixed by embedded bolts (1.1.1) and nuts and prestressed tendons (7) through anchoring ends; the first connecting body (1), the second connecting body (2) and the third connecting body (3) are connected and fixed by embedded bolts (1.1.1) and nuts; the micro pile (4) is pressed into the foundation soil section by section through the pile pressing hole (1.1.6); the micro pile (4) is connected and fixed to the first connecting body (1) by embedded bolts (4.1) at the top, a cover plate (5) and bolts (1.1.5); the cover plate (5) is provided with bolt holes (5.1) corresponding to the embedded bolts (4.1) at the top of the micro pile (4); The first connection body (1) is composed of two first connection members (1.1) of identical structure, four bolts (1.1.1) are longitudinally embedded in the central part of the first connection member (1.1), three prestressed tendon holes (1.1.7) are transversely preset near the bottom part, and embedded bolts (1.1.3) are arranged near the contact surface, and the two identical (1.1) are connected and fixed by screws and nuts through the three prestressed tendon holes (1.1.7) near the bottom side and the prestressed tendon (7) and the connection member (6); The second connection body (2) is longitudinally provided with four bolt holes (2.1) corresponding to the four embedded bolts (1.1.1) of the first connection body (1), and transversely provided with prestressed tendon reserved holes (2.2) corresponding to the three prestressed tendon reserved holes (1.1.2) of the first connection body (1); The third connection body (3) is a tower foot plate and is provided with four bolt holes (3.1) corresponding to the second connection member (2.1).

2. The assembled transmission line micropile foundation according to claim 1, characterized in that: The first connecting member groove (1.1.4) is located in the middle of the first connecting member (1.1), and the depth of the groove (1.1.4) is half the height of the first connecting member (1.1).

3. The assembled transmission line micropile foundation according to claim 1, characterized in that: Embedded bolts (1.1.3) for fixing the two first connecting components (1.1) are provided around the upper parts of the contact surfaces of the two first connecting components (1.1), and the two first connecting components (1.1) are connected and fixed to the embedded bolts (1.1.3) via a connecting piece 6.

4. The assembled transmission line micropile foundation according to claim 1, characterized in that: The top surface of the first connecting member (1.1) is provided with embedded bolts (1.1.5) and are distributed in a square shape as a whole.

5. The construction method of a prefabricated transmission line micropile foundation according to claim 4, characterized in that The following steps are involved: S1 prefabricates the first main body, the second connection main body, the third connection main body, the micropile and the tower foot. When prefabricates the first connection member and the second connection member, the steel frames of each member are tied, the embedded screw rods are welded and connected to the steel frame, concrete is poured into the steel frame, and during pouring, the prestressed reinforcement channel is designed by the method of steel pipe core extraction and retention, so as to obtain each connection member containing the embedded screw rod. The tower foot is a steel structure. When prefabricates the tower foot, the preset bolt holes correspond to the embedded bolt rods, and the tower foot is cross-shaped. When prefabricates the micropile, the pile body longitudinal reinforcement and the pile body stirrups form a pile body frame, the embedded bolt sleeves are welded and connected to the pile body longitudinal reinforcement, and concrete is poured into the pile body frame to obtain the micropile containing the embedded bolt sleeves; S2 assembles and connects the first connection body and the second connection body on site respectively, and then splices the second connection body with the first connection body, thereby forming a square platform with a protruding middle portion; the protruding middle portion is for highlighting the embedded length of the four embedded bolts (1.1.1) in the middle, and for better connection and fixing with the embedded bolts (1.1.1); S3: The longitudinal embedded screw of the first connection body is passed through the longitudinal preset bolt hole of the second connection body, and the prestressed tendons are passed through the prestressed tendon reserved channels arranged transversely in the first connection body and the second connection body and fixed through the anchoring end, thereby realizing the connection and fixation between the first connection body and the second connection body; S4 allows the longitudinal embedded screw of the first connection body to pass through the preset bolt hole of the second connection member and the preset bolt hole of the tower foot, and then connect them through nuts, thereby achieving the connection between the tower foot and the cap; S5 uses the embedded screw on the top surface of the first connecting body to fix the pile-pressing frame in the pile-pressing hole to press the pile, or directly uses a small pile-pressing machine to statically press the micro-pile. After the micro-pile is pressed to the design requirement, the pile-pressing frame is removed or the pile-pressing machine is removed, and then fine stone concrete is filled in the pile-pressing hole, so that the embedded screw on the top surface of the first connecting body passes through the corresponding bolt hole on the cover plate and is connected with the nut, and the connecting bolt passes through the corresponding bolt hole on the cover plate and is connected and fixed with the embedded bolt sleeve on the pile top, thereby realizing the connection and fixation of the pile and the cap. The above-mentioned pile-pressing method also includes hammer pile sinking, vibration pile sinking, etc., and is not limited to static pile sinking; Before splicing and connecting the S6 components, sulfur cement needs to be applied on the connection surface; After the S7 components are assembled and connected, the gaps between the bolts and the concrete are filled by pressure grouting, and the grouting material is micro-expansion C60 high-strength grouting material.

6. The construction method of the assembled transmission line micropile foundation according to claim 5, characterized in that: In step S5, the micro pile can be a single pile, a two-section pile or a three-section pile. The micro pile type can be a prefabricated reinforced concrete pile or a steel pipe pile. The micro pile is pressed or sunk. After the pile is pressed or sunk, the embedded bolt sleeve on the pile top is connected and fixed to the cover plate by connecting bolts.

Images