A precast concrete pipe pile with a precast stepped inclined surface at the pile top for overhead transmission lines

Abstract

The invention discloses a precast concrete pipe pile with a precast stepped inclined plane at the pile top for overhead transmission lines, which relates to the field of electric power construction. It solves the problems in the prior art that when embedding anchor short steel bars into the main body of the pipe pile, the processing is rather cumbersome, and the anchor bolts in the above patent are simply fixed in the concrete, with insufficient contact area with the concrete, unable to ensure the fixing strength of the anchor bolts. The precast pipe pile includes a pile bottom section and a pile top section arranged from top to bottom in the precast pipe pile. By means of a prefabrication and forming method, a stepped inclined plane is formed on the inner wall of the precast pipe pile. Compared with embedding anchor short steel bars in the precast pipe pile, the processing is more convenient. And an adjustable cage is fixed between the stepped inclined planes. After fixing the anchor bolt on the adjustable cage through a height adjusting ring, concrete is cast between the adjustable cage and the pile top section, thereby increasing the contact area between the anchor bolt and the concrete in effect and enhancing its fixing strength.

Description

Technical Field

[0001] The invention relates to the field of electric power construction, in particular to a prefabricated concrete pipe pile with a prefabricated step slope on the pile top for an overhead power transmission line. Background Art

[0002] Precast concrete pipe pile foundation is an excellent foundation type for overhead transmission line towers. This type of foundation has the advantages of high pile bearing capacity, low unit bearing capacity cost, fast construction speed, high pile quality, safety and reliability. It conforms to the concept of green construction and is beneficial to promoting the transformation and upgrading of power transmission and transformation project construction from traditional modes to green construction methods, building a new "clean, low-carbon, safe and efficient" power system, and realizing green and sustainable development of the power grid.

[0003] There are generally two forms of anchoring anchor bolts for this type of foundation in the case of a single pile: the first is to cast a concrete cap on site after the pile is sunk and the core is filled, and the anchor bolts are anchored in the cap after precise positioning; the second is to weld a section of steel cylinder with operation holes and connecting steel plates on the top of the concrete precast pile in advance, and after the pile is sunk, the position of the anchor bolts is determined according to the precise positioning of the tower root, and holes are drilled on site at the corresponding positions. After the tower is in place, the operation holes are used to assist in fixing the tower anchor bolts. The first method involves on-site excavation and concrete pouring operations, which to a certain extent reduces the green and environmentally friendly advantages of the pile foundation. The second method requires the pre-welding of heavy steel cylinders and steel plate connectors at the pile end, and requires drilling of thicker steel plates on site, which is very difficult to construct, and the anti-corrosion treatment of the on-site holes is also difficult.

[0004] In the patent application with application number CN202211261835.3, a transmission line tower pile foundation and a construction method thereof are disclosed, which relate to the technical field of power grid equipment. A transmission line tower pile foundation, comprising: a prefabricated pipe pile body, short steel bars, core-filled concrete, anchor bolts and concrete; the prefabricated pipe pile body is a hollow structure, and the core-filled concrete and the concrete are filled into the hollow part of the prefabricated pipe pile body; the short steel bars are pre-embedded and anchored in the prefabricated pipe pile body at one end close to the ground, and the short steel bars extend to the hollow part of the prefabricated pipe pile body; the anchor bolts are fixedly arranged at one end of the prefabricated pipe pile body close to the ground. The above invention provides a transmission line tower pile foundation and a construction method thereof, which strengthens the bonding force between concrete and the prefabricated pipe pile body by pre-embedded and anchored short steel bars in the prefabricated pipe pile body, thereby ensuring the stability of the transmission line tower.

[0005] The above patent is relatively complicated when pre-embedding short steel bars into the pipe pile body, and the anchor bolts in the above patent are simply fixed in the concrete, and the contact area with the concrete is insufficient, and the fixing strength of the anchor bolts cannot be guaranteed. Summary of the invention

[0006] The object of the present invention is to provide a precast concrete pipe pile with a precast stepped inclined surface at the pile top for overhead transmission lines, which is used to solve the problems that in the prior art, when embedding anchor short steel bars into the main body of the pipe pile, the processing is relatively cumbersome, and the anchor bolts in the above patent are only simply fixed in the concrete, and the contact area with the concrete is insufficient, unable to ensure the fixing strength of the anchor bolts.

[0007] The technical solution adopted by the present invention is as follows: A precast concrete pipe pile with a precast stepped inclined surface at the pile top for overhead transmission lines, including a precast pipe pile sunk into the ground. A pile bottom section and a pile top section are sequentially arranged in the precast pipe pile from top to bottom. The pile bottom section is provided with core filling concrete, and stepped inclined surfaces are uniformly arranged on the inner wall of the pile top section. A positioning rod is coaxially arranged in the pile top section;

[0008] The positioning rod is sequentially provided with a threaded section and a ratchet section from top to bottom. Ratchets are uniformly arranged on the ratchet section. Multiple groups of adjustable cages are arranged on the ratchet section from top to bottom. The outer side of the adjustable cage extends to the surface of the stepped inclined surface, and the adjustable cage is clamped between the stepped inclined surfaces to fix its position. A height adjustment ring is arranged between the adjustable cages. Anchor bolts are arranged on the outer side of the height adjustment ring. Concrete is poured between the adjustable cage and the precast pipe pile. The threaded section is provided with a positioning bolt for restricting the axial position of the adjustable cage;

[0009] The adjustable cage includes a group of one-way collar rings. Each group of one-way collar rings has two. The two one-way collar rings are connected by a cage skeleton that is hinged to each other. Among them, rotating ears are uniformly arranged on the outer side of the one-way collar ring. The cage skeleton is connected by a pin shaft between the rotating ears. One end of the cage skeleton away from the rotating ear is movably connected by a pin shaft;

[0010] The one-way collar ring includes a limiting ring sleeved on the outer side of the ratchet section. An installation groove is opened on the inner wall of the limiting ring on the side close to the ratchet. A ratchet claw matched with the ratchet is arranged in the installation groove through a rotating shaft. A movable limiting block is arranged on the side of the rotating end of the ratchet claw. A fixed limiting block is arranged on the inner wall of the installation groove above the movable limiting block for restricting the counterclockwise rotation of the ratchet claw.

[0011] Further, the anchor bolt includes fixing frames symmetrically arranged on both sides of the height adjustment ring, and a bolt body is arranged on the fixing frame.

[0012] Further, the step height of the stepped inclined surface is 50 mm.

[0013] Further, the length of the pile top section is greater than the length of the bolt body.

[0014] Further, an adjustment groove is formed in the fixing frame, the bolt body is arranged vertically in the adjustment groove, and the upper end of the bolt body extends out of the upper surface of the precast pipe pile, so that the transmission line tower on the ground can be connected through the bolt body. A limit bolt is arranged on the threaded section at the upper end of the bolt body, and the limit bolt is located above the fixing frame.

[0015] Further, the slope of the stepped inclined surface is 1:6 - 1:8.

[0016] Further, chamfers are arranged at the joint of the stepped inclined surface and the precast pipe pile and at the convex part of the stepped inclined surface.

[0017] Further, the inclined surface of the stepped inclined surface is provided with a rough surface.

[0018] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0019] 1. The present invention forms a stepped inclined surface on the inner wall of the precast pipe pile by a prefabrication method. Compared with embedding anchor short steel bars in the precast pipe pile, the processing is more convenient. An adjustable cage is fixed between the stepped inclined surfaces. After fixing the anchor bolt on the adjustable cage through a height adjustment ring, concrete is cast between the adjustable cage and the pile top section, thereby increasing the contact area between the anchor bolt and the concrete and enhancing its fixing strength.

[0020] 2. The state of the adjustable cage in the present invention is adjustable. The cage skeleton in the adjustable cage is originally in a contracted state. At this time, the adjustable cage can be conveniently placed into the precast pipe pile. Then, by moving the one-way sleeve ring, the cage skeleton is opened, and the adjustable cage is fixed in the precast pipe pile, which is convenient to use and reduces the working difficulty.

[0021] 3. The bolt body in the present invention is arranged in the adjustment groove arranged in the radial direction. Therefore, before casting concrete, according to the position of the screw holes at the base of the transmission line tower, the position of the bolt body can be adjusted by sliding the bolt body in the adjustment groove.

[0022] 4. In order to avoid stress concentration in the present invention, chamfers are made at the joint of the stepped inclined surface and the precast pipe pile and at the convex part of the stepped inclined surface. And in order to increase the bonding force of the concrete, a rough surface treatment is carried out on the inclined surface of the stepped inclined surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural view of the present invention;

[0024] Figure 2 is a top view of the present invention;

[0025] Figure 3 is Figure 1 a partial enlarged view of part A in

[0026] Figure 4 is Figure 1 A partial enlarged view at position B in

[0027] Figure 5 is a schematic structural view when the rotating ear in the present invention is not fully unfolded;

[0028] Figure 6 is Figure 5 A partial enlarged view at position C in

[0029] Explanation of reference numerals:

[0030] 1, precast pipe pile; 2, stepped inclined surface; 3, core-filled concrete; 4, anchor bolt; 41, bolt body; 42, adjustment groove; 43, limit bolt; 44, fixing bracket; 5, adjustable cage; 51, limit ring; 52, installation groove; 53, ratchet pawl; 54, rotating ear; 55, cage skeleton; 56, movable limit block; 57, fixed limit block; 6, positioning rod; 61, ratchet teeth; 7, height adjustment ring; 8, positioning bolt. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] Figures 1 - 6 As shown: A precast concrete pipe pile with a precast stepped inclined surface at the pile top for an overhead transmission line includes a precast pipe pile 1 sunk into the ground. The pile driving is completed according to the normal process, and then core-filled concrete 3 is poured into the precast pipe pile 1 until a certain range at the pile top, so that a pile bottom section and a pile top section are sequentially arranged in the precast pipe pile 1 from top to bottom. Stepped inclined surfaces 2 are uniformly arranged on the inner wall of the pile top section, and a positioning rod 6 is coaxially arranged in the pile top section;

[0035] When a series of step-shaped slopes 2 are prefabricated at the pile end of the prefabricated pipe pile 1, it is only necessary to process the mold used to produce the prefabricated pipe pile 1. The inner walls of the prefabricated pipe piles 1 produced subsequently will all be formed with the step-shaped slopes 2. Therefore, compared with pre-embedded anchoring short steel bars in the prefabricated pipe pile 1, the processing is more convenient.

[0036] The positioning rod 6 is provided with a threaded section and a ratchet section in sequence from top to bottom, and ratchets 61 are evenly provided on the ratchet section. A plurality of groups of adjustable cages 5 are provided on the ratchet section from top to bottom, and the outer side of the adjustable cage 5 extends to the surface of the step-shaped inclined plane 2. The adjustable cage 5 is clamped between the step-shaped inclined plane 2 to fix its position. A height adjustment ring 7 for controlling the axial distance thereof is provided between the adjustable cages 5, and an anchor bolt 4 is provided on the outer side of the height adjustment ring 7. The threaded section is provided with a positioning bolt 8 for limiting the axial position of the adjustable cage 5. After the anchor bolt 4 is fixed to the adjustable cage 5 through the height adjustment ring 7, concrete is cast between the adjustable cage 5 and the pile top section, thereby increasing the contact area between the anchor bolt 4 and the concrete in disguised form and increasing its fixing strength.

[0037] The adjustable cage 5 includes a group of one-way rings, each group of one-way rings is provided with two one-way rings, and the two one-way rings are connected by a cage frame 55 that is hinged to each other, wherein rotating ears 54 are evenly arranged on the outside of the one-way rings, and the cage frame 55 is connected between the rotating ears 54 through a pin shaft, and the end of the cage frame 55 away from the rotating ear 54 is movably connected through a pin shaft.

[0038] The one-way ring includes a limit ring 51 which is sleeved on the outside of the ratchet section. A mounting groove 52 is provided on the inner wall of the limit ring 51 on the side close to the ratchet 61. A pawl 53 cooperating with the ratchet 61 is provided in the mounting groove 52 through a rotating shaft. A movable limit block 56 is provided on the side of the rotating end of the pawl 53. A fixed limit block 57 is provided on the inner wall of the mounting groove 52 above the movable limit block 56 for limiting the counterclockwise rotation of the pawl 53. When the adjustable cage 5 is moved downward, the one-way ring located below cannot move further when it touches the core-filled concrete 3 or the height adjustment ring 7, and the one-way ring located above it continues to move downward, thereby expanding the cage frame 55 between the two and resting on the stepped slope 2. Since the pawl 53 cannot rotate counterclockwise, when the cage frame 55 is expanded, the restriction of the pawl 53 by the ratchet 61 prevents the one-way ring from moving upward, thereby ensuring that the cage frame 55 is expanded, thereby limiting the axial and circumferential position of the adjustable cage 5. At this time, high-strength concrete can be poured into the pile top section and tamped and vibrated to wrap the anchor bolts 4 connected to the adjustable cage 5 and fixed on the adjustable cage 5, and the contact area between the anchor bolts 4 and the concrete is increased through the adjustable cage 5, thereby enhancing the connection strength between the anchor bolts 4 and the prefabricated pipe pile 1.

[0039] In use, first fix the positioning rod 6 vertically in the pile top section, and then sleeved the adjustable cage body 5 on the positioning rod 6. Use a pipe with a diameter larger than that of the positioning rod 6 to push the first adjustable cage body 5 to the lowermost end of the positioning rod 6, and expand and fix the originally folded cage frame 55 between the positioning rods 6. Then, sequentially place other adjustable cage bodies 5 and repeat the above operations. Among them, in order to control the number of adjustable cage bodies 5, a height adjustment ring 7 is arranged between the adjustable cage bodies 5 to control the interval between the adjustable cage bodies 5.

[0040] The anchor bolt 4 includes fixing frames 44 symmetrically arranged on both sides of the height adjustment ring 7. An adjustment groove 42 is formed on the fixing frame 44. A bolt body 41 is arranged vertically in the adjustment groove 42. The upper end of the bolt body 41 extends out of the upper surface of the precast pipe pile 1, so that the bolt body 41 can be connected to the transmission line tower on the ground. A limit bolt 43 is arranged on the threaded section at the upper end of the bolt body 41. The limit bolt 43 is located above the fixing frame 44. After screwing the limit bolt 43 onto the threaded section at the top end of the bolt body 41, it prevents the bolt body 41 from falling out of the adjustment groove 42, thereby restricting the axial position of the bolt body 41. And before casting concrete, according to the position of the screw holes at the base of the transmission line tower, the position of the bolt body 41 can be adjusted by sliding the bolt body 41 in the adjustment groove 42.

[0041] Embodiment 2

[0042] The difference between this embodiment and Embodiment 1 is that: the step height of the stepped inclined surface 2 is 50 mm, and the slope of the inclined surface is 1:6 to 1:8; in order to avoid stress concentration, at the joint of the stepped inclined surface 2 and the precast pipe pile 1, chamfers should be made at the protruding parts of the stepped inclined surface 2. In order to increase the bonding force of the concrete, the inclined surface of the stepped inclined surface 2 should be treated with a rough surface, and the length of the pile top section is greater than the length of the bolt body 41.

Claims

1. A precast concrete pipe pile with a precast stepped inclined plane at the pile top for overhead transmission lines, characterized in that, It includes a precast pipe pile (1). A pile bottom section and a pile top section are sequentially arranged in the precast pipe pile (1) from top to bottom. The pile bottom section is provided with core-filled concrete (3). Step-shaped inclined surfaces (2) are uniformly arranged on the inner wall of the pile top section. A positioning rod (6) is coaxially arranged in the pile top section. The positioning rod (6) is sequentially provided with a threaded section and a ratchet section from top to bottom. Ratchets (61) are uniformly arranged on the ratchet section. Multiple sets of adjustable cages (5) are arranged on the ratchet section from top to bottom. The outer side of the adjustable cage (5) extends to the surface of the step-shaped inclined surface (2). The adjustable cage (5) is stuck between the step-shaped inclined surfaces (2) to fix its position. A height adjustment ring (7) is arranged between the adjustable cages (5). Anchor bolts (4) are arranged on the outer side of the height adjustment ring (7). Concrete is poured between the adjustable cage (5) and the precast pipe pile (1). The threaded section is provided with a positioning bolt (8) for restricting the axial position of the adjustable cage (5). The adjustable cage (5) includes a set of one-way collar rings. Each set of one-way collar rings has two. The two one-way collar rings are connected by a cage framework (55) that is hinged to each other. Among them, rotating ears (54) are uniformly arranged on the outer side of the one-way collar ring. The cage framework (55) is connected between the rotating ears (54) through a pin shaft. One end of the cage framework (55) away from the rotating ear (54) is movably connected through a pin shaft. The one-way collar ring includes a limiting ring (51) sleeved on the outer side of the ratchet section. An installation groove (52) is opened on the inner wall of the limiting ring (51) on the side close to the ratchet (61). A ratchet pawl (53) that cooperates with the ratchet (61) is arranged in the installation groove (52) through a rotating shaft. A movable limiting block (56) is arranged on the side of the rotating end of the ratchet pawl (53). A fixed limiting block (57) is arranged on the inner wall of the installation groove (52) above the movable limiting block (56) for restricting the counterclockwise rotation of the ratchet pawl (53).

2. The concrete precast pipe pile with a precast stepped inclined surface at the pile top for an overhead transmission line according to claim 1, wherein: The anchor bolt (4) includes fixing frames (44) symmetrically arranged on both sides of the height adjustment ring (7). A bolt body (41) is arranged on the fixing frame (44).

3. The concrete precast pipe pile with a precast stepped inclined plane at the pile top for an overhead transmission line according to claim 1, wherein: The step height of the step-shaped inclined surface (2) is 50 mm.

4. A precast concrete pipe pile with a precast stepped inclined surface at the pile top for an overhead transmission line according to claim 2, characterized in that: The length of the pile top section is greater than the length of the bolt body (41).

5. The concrete precast pipe pile with a precast stepped inclined plane at the pile top for an overhead transmission line according to claim 2, wherein: An adjustment groove (42) is opened on the fixing frame (44). The bolt body (41) is arranged in the adjustment groove (42) along the vertical direction. The upper end of the bolt body (41) extends out of the upper surface of the precast pipe pile (1). Thus, the bolt body (41) can be used to connect a transmission line tower on the ground. A limiting bolt (43) is arranged on the threaded section at the upper end of the bolt body (41). The limiting bolt (43) is located above the fixing frame (44).

6. A precast concrete pipe pile with a precast stepped inclined plane at the pile top for an overhead transmission line according to claim 3, characterized in that: The slope of the inclined surface of the step-shaped inclined surface (2) is 1:6 - 1:

8.

7. A precast concrete pipe pile with a precast stepped inclined plane at the pile top for an overhead transmission line according to claim 6, characterized in that: Chamfers are arranged at the joint of the step-shaped inclined surface (2) and the precast pipe pile (1) and at the convex part of the step-shaped inclined surface (2).

8. A precast concrete pipe pile with a precast stepped inclined surface at the pile top for an overhead transmission line according to claim 7, characterized in that: The inclined surface of the step-shaped inclined surface (2) is provided with a rough surface.

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