PHC pipe pile supporting stand column and construction method

Abstract

The invention discloses a PHC pipe pile supporting stand column and a construction method, and relates to the technical field of supporting stand columns. A PHC pipe pile supporting stand column comprises two cement columns which are vertically distributed, inner holes are formed in the tops of the cement columns in a penetrating mode, the PHC pipe pile supporting stand column further comprises two pairs of end covers which are fixedly arranged at the two ends of the two cement columns in a sleeving mode respectively, each end cover is provided with a round hole aligned with the corresponding inner hole, and the two ends of each end cover are provided with a through hole. A plurality of metal wires which are circumferentially distributed are fixedly arranged in the cement column; the steel pipe is arranged between the two cement columns, the two ends of the steel pipe are fixedly connected with annular plates, and the annular plates are fixedly connected with the end covers in a welding mode; stress can be transmitted between the two concrete columns not only through the steel pipes, the stress concentration phenomenon is effectively reduced, the overall strength is remarkably improved, construction and installation are facilitated, meanwhile, water can be prevented from flowing into the concrete columns from notches of the steel pipes, and the supporting strength of the concrete columns and the bearing platform is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of support columns, and specifically relates to a PHC pipe pile support column and a construction method thereof. Background Art

[0002] To ensure the waterproof effect at the foundation slab, traditional support columns for foundation pits generally use concrete cast-in-place piles with inserted lattice columns. However, when all the pile foundations are PHC pipe piles, additional construction machinery for cast-in-place piles needs to be brought in, resulting in a long construction period and high costs.

[0003] In the prior art, the Chinese patent with the authorization number CN219862850U discloses a common connection node for engineering pipe piles and column piles. By adding a steel structure conversion layer between the engineering pipe piles (making the steel structure conversion layer within the foundation slab range to solve the water stop problem), the engineering pipe piles can be used as column piles. However, there are still problems to be solved in the application process. For example, the steel structure conversion layer is mainly composed of steel pipes and reinforcing bars, which causes the force to be transmitted only through the steel pipes between the upper and lower PHC pipe columns. Although anchor bars are provided inside, the anchor bars are mainly connected to the ends of the PHC pipe columns by welding, and the ends of the PHC pipe columns are mainly connected to the cement structure through end caps made of metal materials. This easily leads to the stress concentration mainly at the ends of the PHC pipe columns, resulting in stress concentration phenomenon. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a PHC pipe pile support column that can overcome or at least partially solve the above problems.

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A PHC pipe pile support column includes two vertically distributed cement columns. Inner holes are provided through the tops of the cement columns. The support column further includes: two pairs of end caps, respectively fixedly sleeved at both ends of the two cement columns. Among them, a circular hole aligned with the inner hole is provided on each end cap. A plurality of metal wires are fixedly arranged in a circumferential distribution inside the cement columns; a steel pipe is arranged between the two cement columns. Among them, annular plates are fixedly connected to both ends of the steel pipe, and the annular plates are fixedly connected to the end caps by welding. A strengthening part connected to the two groups of metal wires is provided inside the steel pipe.

[0006] Preferably, the strengthening part includes a plurality of strengthening wires fixedly connected between the two annular plates. Annular wires are fixedly connected to both ends of the strengthening wires. Hooks are provided at the tops of the metal wires, and the hooks are hung on the annular wires.

[0007] Preferably, an annular groove is provided on the top of the end cover, a through hole is provided on the inner bottom of the annular groove, and the hook extends into the annular groove through the through hole.

[0008] Preferably, the inner wall of the end cover is fixedly connected with a plurality of circumferentially distributed support plates, the end of each support plate is fixedly connected with a symmetrically arranged clamping plate, and the metal wire is clamped between two pairs of clamping plates, wherein the outer wall of the metal wire is fixedly connected with a pair of limit plates, and the limit plates are arranged on the upper and lower sides of the clamping plate.

[0009] Preferably, the outer wall of each of the metal wires is provided with a bending area, and the bending areas on the plurality of metal wires form an annular limiting area, and a circular ring is fixedly sleeved on the annular limiting area.

[0010] Preferably, the outer shape of the bending area is in the shape of the letter W, and the turning point of the bending area is transitioned through an arc.

[0011] Furthermore, an annular disk is fixedly connected to the outer wall of the lower end of the steel pipe, a reinforcing rib is fixedly connected between the top surface of the annular disk and the outer wall of the steel pipe, and the outer wall of the reinforcing rib is provided with a wire threading hole; the outer wall of the reinforcing wire is fixedly connected to a V-shaped wire that penetrates the outer wall of the steel pipe, the outer wall of the steel pipe is fixedly connected to a sleeve mounted on both ends of the V-shaped wire, and the outer wall of the V-shaped wire is fixedly connected to a ring.

[0012] Furthermore, an annular welding groove is provided at the end edges of the end cover and the annular plate, and a circumferentially distributed T-shaped groove is provided at the inner bottom of the annular welding groove, and two mutually aligned T-shaped grooves form an I-shaped groove.

[0013] Furthermore, a protective cover is sleeved on the top of the end cover located at the top, and the inner wall of the protective cover is bonded to the end cover by structural adhesive.

[0014] A construction method for a PHC pipe pile support column comprises the following steps: S1. First, one of the cement columns is pressed into the pile hole by a static pile driver; S2, placing a steel pipe with an annular plate on top of the current cement column; S3, causing the annular wire to be stuck into the hooks of the multiple metal wires under pressure; S4, welding the edge of the annular plate to the edge of the end cover by welding equipment; S5. Next, another cement column is installed on the top of the steel pipe; S6. Complete the pouring construction of the cap and the base plate, and place the annular plate, reinforcing ribs and V-shaped wires in the cap; S7. Fix the protective cover to the top of the cement column by structural adhesive, and then weld the steel joist to the top of the protective cover; S8. When the cement columns and steel beam brackets on the upper end face of the bottom plate are not needed, cut the steel pipes along the surface of the bottom plate; S9. Pour cement mortar into the inner holes of the steel pipes and the cement columns; S10. Weld the metal plate to the cut of the steel pipe to complete the sealing of the steel pipe.

[0015] After adopting the above technical solutions, the present invention has the following beneficial effects compared with the prior art: 1. In the present invention, the annular wires at both ends of the reinforcing wire are respectively buckled in two groups of hooks, so that the metal wires in the two cement columns can also be connected by the reinforcing wire. In this way, the stress between the two cement columns is not only transmitted by the steel pipe, effectively reducing the stress concentration phenomenon, significantly improving the overall strength, and facilitating construction and installation.

[0016] 2. In the present invention, the annular plate, the reinforcing rib and the V-shaped wire are placed in the bearing platform, and the steel bars in the bearing platform pass through the wire passing holes and the sleeve rings, so that the connection between the bearing platform and the steel pipe can be made closer.

[0017] 3. Through the arrangement of the V-shaped wire and the reinforcing wire in the present invention, the stress of the metal wire can be directly transmitted to the steel wire and the steel bar in the bearing platform, so that the integrity between the cement column and the bearing platform is better, and the strength is significantly improved. The V-shaped wire and the reinforcing wire can form a triangular structure, and the triangular structure will further improve the integrity and the connection strength.

[0018] 4. In the present invention, the steel pipe is cut along the surface of the bottom plate, then cement mortar is poured into the inner holes of the steel pipe and the cement column, and finally the metal plate is welded to the cut of the steel pipe to complete the sealing of the steel pipe. In this way, water can be prevented from flowing into the cement column through the cut of the steel pipe, ensuring the support strength of the cement column and the bearing platform. Description of the Drawings

[0019] In the drawings: Figure 1 is an axonometric structural schematic diagram of a PHC pipe pile support column proposed by the present invention; Figure 2 is a structural schematic diagram of a PHC pipe pile support column in the use state proposed by the present invention; Figure 3 is an axonometric structural schematic diagram of the cement column and the steel pipe of a PHC pipe pile support column proposed by the present invention; Figure 4 is a partial sectional axonometric structural schematic diagram of a PHC pipe pile support column proposed by the present invention; Figure 5 is a PHC pipe pile support column proposed by the present invention Figure 4 structural schematic diagram of part A; Figure 6Schematic axonometric structure diagram of the wire and reinforcing wire of a PHC pipe pile support column proposed by the present invention; Figure 7 A PHC pipe pile support column proposed by the present invention Figure 6 Schematic diagram of the local structure in; Figure 8 Schematic axonometric structure diagram of the local steel pipe of a PHC pipe pile support column proposed by the present invention; Figure 9 Schematic axonometric structure diagram of the end cap of a PHC pipe pile support column proposed by the present invention; Figure 10 Schematic axonometric structure diagram of the steel pipe of a PHC pipe pile support column proposed by the present invention; Figure 11 Schematic axonometric structure diagram of the cut steel pipe of a PHC pipe pile support column proposed by the present invention; Figure 12 Schematic axonometric structure diagram of the protective cover of a PHC pipe pile support column proposed by the present invention; Figure 13 Schematic structure diagram of a PHC pipe pile support column in the final construction state proposed by the present invention.

[0020] In the figure: 1, cement column; 2, inner hole; 3, end cap; 4, wire; 5, ring; 6, bending area; 7, support plate; 8, clamping plate; 9, limiting plate; 10, annular groove; 11, hook; 12, perforation; 13, steel pipe; 14, annular plate; 15, reinforcing wire; 16, annular wire; 17, annular disc; 18, wire passing hole; 19, V-shaped wire; 20, collar; 21, annular welding groove; 22, T-shaped groove; 23, reinforcing rib; 24, round hole; 25, protective cover; 26, bearing platform; 27, bottom plate; 28, profiled steel supporting beam; 29, metal plate; 30, sleeve. Detailed implementation method

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0022] Example 1: Refer to Figures 1 - 13, a PHC pipe pile support column, including two cement columns 1 vertically distributed. The cement columns 1 are equivalent to PHC pipe piles. An inner hole 2 is penetrated through the top of the cement column 1. The axial cross-sectional shape of the inner hole 2 is circular. It also includes: two pairs of end caps 3 made of metal, respectively fixedly sleeved at both ends of the two cement columns 1. Among them, a circular hole 24 aligned with the inner hole 2 is provided on each end cap 3. A plurality of metal wires 4 distributed in a circle are fixedly arranged in the cement column 1. The material of the metal wires 4 is steel wire or steel bar; a steel pipe 13 is arranged between the two cement columns 1. Among them, annular plates 14 are fixedly connected to both ends of the steel pipe 13. The annular plates 14 and the end caps 3 are fixedly connected by welding. A strengthening part connected to the two groups of metal wires 4 is arranged in the steel pipe 13.

[0023] Specifically, during use, first, one of the cement columns 1 is pressed into the pile hole by a static pile driver. Then, the steel pipe 13 with the annular plate 14 is placed on the top of the current cement column 1, that is, the top of the end cap 3. Then, the steel pipe 13 and the metal wire 4 are connected through the strengthening part, and the rapid positioning of the steel pipe 13 can be completed, significantly improving the construction efficiency. Then, the edge of the annular plate 14 and the edge of the end cap 3 are welded by welding equipment. Immediately afterwards, the other cement column 1 is placed on the top of the steel pipe 13, and the steel pipe 13 is connected to the other cement column 1 in a similar manner, and the end cap 3 on the other one and the annular plate 14 are welded by welding equipment, and the assembly of the two cement columns 1 can be completed. Due to the setting of the strengthening part, the metal wires 4 in the two cement columns 1 can also be connected through the strengthening part. In this way, the stress can be transmitted not only by the steel pipe 13 between the two cement columns 1, effectively reducing the stress concentration phenomenon, significantly improving the overall strength, and facilitating construction and installation. After the construction of the two cement columns 1 is completed, the casting construction of the bearing platform 26 and the bottom plate 27 is immediately completed. During the construction process, the steel pipe 13 is placed in the bearing platform 26, and the top of the steel pipe 13 is exposed from the bottom plate 27. Immediately afterwards, the profiled steel supporting beam 28 is installed on the top of the top cement column 1.

[0024] The end edges of the above-mentioned end cap 3 and the annular plate 14 are provided with annular welding grooves 21, and the inner bottom of the annular welding grooves 21 is provided with T-shaped grooves 22 distributed in a circle. Two mutually aligned T-shaped grooves 22 form an I-shaped groove.

[0025] Specifically, when welding the annular plate 14 and the end cap 3, the two mutually aligned annular welding grooves 21 can make no weld seam need to be reserved between them, making the welding work more convenient and the connection strength between them better. The I-shaped groove formed by the two groups of T-shaped grooves 22 will make the welding material form an I-shaped structure, thereby making the connection between the annular plate 14 and the end cap 3 tighter and the strength will also be significantly improved.

[0026] A protective cover 25 is sleeved on the top of the end cap 3 at the topmost position, and the inner wall of the protective cover 25 is bonded to the end cap 3 with structural adhesive; after the casting of the bearing platform 26 and the bottom plate 27 is completed, structural adhesive is applied to the inside of the protective cover 25, and then the protective cover 25 is sleeved on the top of the cement column 1, and then the steel section beam 28 is welded to the top of the protective cover 25, so that the inner hole 2 at the top of the cement column 1 can be effectively blocked, preventing water from leaking into the inside of the cement column 1 and ensuring the service strength of the cement column 1.

[0027] Example 2: Refer to Figures 3 - 6 , a PHC pipe pile support column, which is basically the same as Example 1. Furthermore: The above-mentioned strengthening part includes a plurality of strengthening wires 15 fixedly connected between two annular plates 14. Both ends of the strengthening wires 15 are fixedly connected with annular wires 16. A hook 11 is provided at the top of the metal wire 4, and the hook 11 is hung on the annular wire 16. The materials of the strengthening wires 15, the annular wires 16 and the hooks 11 are all steel wires or steel bars, and the annular wire 16 is connected to the strengthening wire 15 by welding. An annular groove 10 is provided at the top of the end cap 3, and a through hole 12 is provided at the inner bottom of the annular groove 10. The hook 11 extends into the annular groove 10 through the through hole 12.

[0028] During use, first, one of the cement columns 1 is pressed into the pile hole by a static pile press, and then the steel pipe 13 with the annular plate 14 is placed on the top of the current cement column 1, that is, on the top of the end cap 3, and the annular wire 16 is located in the annular groove 10, so that the positioning of the steel pipe 13 can be quickly completed. Then, the steel pipe 13 is pressed down so that the annular wire 16 is clamped into the hooks 11 of a plurality of metal wires 4 under the action of pressure, and the quick positioning of the steel pipe 13 can be completed, significantly improving the construction efficiency. Then, the edge of the annular plate 14 is welded to the edge of the end cap 3 by welding equipment. Immediately afterwards, another cement column 1 is placed on the top of the steel pipe 13, and in a similar manner, the annular wire 16 at the top of the steel pipe 13 is clamped into the hook 11 of the other cement column 1, and the end cap 3 on the other one is welded to the annular plate 14 by welding equipment, and the assembly of the two cement columns 1 can be completed. Since the annular wires 16 at both ends of the strengthening wire 15 are respectively buckled into two groups of hooks 11, the metal wires 4 in the two cement columns 1 can also be connected by the strengthening wire 15. In this way, the stress between the two cement columns 1 is not only transmitted by the steel pipe 13, effectively reducing the stress concentration phenomenon, and the overall strength is significantly improved, and it is also convenient for construction and installation.

[0029] Example 3: Refer to Figures 4 - 7 , a PHC pipe pile support column, which is basically the same as Example 2. Furthermore: The inner wall of the above-mentioned end cap 3 is fixedly connected with a plurality of circumferentially distributed support plates 7. The end of each support plate 7 is fixedly connected with symmetrically arranged clamping plates 8. The metal wire 4 is clamped between a pair of two clamping plates 8. Among them, a pair of limiting plates 9 are fixedly connected to the outer wall of the metal wire 4, and the limiting plates 9 are arranged on the upper and lower sides of the clamping plates 8.

[0030] Specifically, when pouring the PHC pipe pile, the positioning of the metal wire 4 can be quickly completed through the arrangement of the clamping plates 8, so as to facilitate the rapid pouring of the PHC pipe pile. Moreover, the support plates 7 will make the connection between the end cap 3 and the metal wire 4 tighter. In practice, in order to improve the strength, the metal wire 4 and the clamping plates 8 can also be welded together.

[0031] A bending area 6 is provided on the outer wall of each metal wire 4. The bending areas 6 on multiple metal wires 4 form an annular limiting area. A circular ring 5 is fixedly sleeved on the annular limiting area. The shape of the bending area 6 is in the shape of the letter "W", and the turning points at the bends are transitioned by arcs.

[0032] Specifically, after the layout of the metal wires 4 is completed, the metal circular ring 5 is sleeved on the annular limiting area formed by the bending areas 6. Thus, the stability between multiple metal wires 4 is higher, and further the support strength of the PHC pipe pile can be improved. And in practice, welding the circular ring 5 and the metal wire 4 together can improve the connection strength between the circular ring 5 and the metal wire 4, and the design of the bending area 6 will make the positioning and installation of the circular ring 5 more convenient.

[0033] Example 4: Refer to Figures 1 - 4 and Figure 6 、 Figure 8 、 Figure 11 , a PHC pipe pile support column, which is basically the same as that in Example 3. Further: An annular disc 17 is fixedly connected to the outer wall of the lower end of the above-mentioned steel pipe 13. A reinforcing rib 23 is fixedly connected between the top surface of the annular disc 17 and the outer wall of the steel pipe 13. A wire passing hole 18 is provided on the outer wall of the reinforcing rib 23; a V-shaped wire 19 penetrating through the outer wall of the steel pipe 13 is fixedly connected to the outer wall of the reinforcing wire 15. The V-shaped wire 19 is made of steel wire or steel bar. Sleeve pipes 30 sleeving the two ends of the V-shaped wire 19 are fixedly connected to the outer wall of the steel pipe 13. A collar 20 is fixedly connected to the outer wall of the V-shaped wire 19.

[0034] During the construction process of the bearing platform 26 and the bottom plate 27, the annular plate 17, the reinforcing rib 23 and the V-shaped wire 19 are placed inside the bearing platform 26, and the steel bars inside the bearing platform 26 pass through the wire passing holes 18 and the collar 20. Thus, the connection between the bearing platform 26 and the steel pipe 13 can be made closer, and through the arrangement of the V-shaped wire 19 and the reinforcing wire 15, the stress of the metal wire 4 can be directly transmitted to the steel wire and the steel bars inside the bearing platform 26. In this way, the integrity of the cement column 1 and the bearing platform 26 is better, and the strength is significantly improved. The V-shaped wire 19 and the reinforcing wire 15 can form a triangular structure, and the triangular structure will further improve the integrity and the connection strength. After pouring is completed, the top of the steel pipe 13 will protrude from the bottom plate 27.

[0035] Example 5: Refer to Figures 1 - 13 , a construction method for a PHC pipe pile support column, including the following steps: S1. First, press one of the cement columns 1 into the pile hole by a static pile press; S2. Place the steel pipe 13 with the annular plate 14 on the top of the current cement column 1; S3. Make the annular wire 16 be stuck into the hooks 11 of the plurality of metal wires 4 under pressure; S4. Weld the edge of the annular plate 14 and the edge of the end cap 3 by welding equipment; S5. Immediately install another cement column 1 on the top of the steel pipe 13; S6. Complete the pouring construction work of the bearing platform 26 and the bottom plate 27, and place the annular plate 17, the reinforcing rib 23 and the V-shaped wire 19 inside the bearing platform 26; S7. Fix the protective cover 25 on the top of the cement column 1 by structural adhesive, and then weld the profiled steel supporting beam 28 on the top of the protective cover 25; S8. When the cement column 1 and the profiled steel supporting beam 28 on the upper surface of the bottom plate 27 are not needed, cut the steel pipe 13 along the surface of the bottom plate 27; S9. Pour cement mortar into the inner holes 2 of the steel pipe 13 and the cement column 1; S10. Weld the metal plate 29 to the cut of the steel pipe 13 to complete the sealing of the steel pipe 13.

[0036] More specifically, the calculation method for the height and wall thickness of the steel structure conversion layer, that is, the steel pipe 13 (taking values according to the "Steel Structure Design Standard" GB50017-2017).

[0037] ① Method for taking the value of the height of the steel structure conversion layer: The height h of the conversion layer = the height of the bearing platform 26 - the height of the pile top buried in the bearing platform 26 + 30 - 50 mm. This method reserves construction errors while ensuring compliance with the specification requirements, and the steel structure conversion layer being higher than the bottom plate 27 facilitates later cutting operations.

[0038] ② Wall thickness determination method for steel structure transfer floor: (1) Preliminary estimation of wall thickness The thickness of the steel structure transfer floor is determined according to the bearing capacity of the pile foundation. The required steel structure area is calculated according to A = F / f. For example, when the bearing capacity design value of a PHC pipe pile with a diameter of 600 is 4500 KN and Q235 steel (the compressive strength design value is taken as 205 N / mm2 / ) is used, the required steel structure area A = 4500000 / 205 = 21951.22 mm2 / , that is, the wall thickness t = 12 mm can meet the bearing capacity requirements.

[0039] (2) Stability review Overall stability calculation: For example, the height of the pile cap 26 is 1000 mm, the PHC pile with a diameter of 600 mm is embedded in the pile cap 26 with a height of 50 mm, the thickness h of the steel structure transfer floor = 1000 - 50 + 50 = 1000 mm, the radius of gyration i of the circular steel pipe with a wall thickness of 12 mm = √I / A = 208 mm, the slenderness ratio l = 100 / 208 = 4.81. Looking up the table, the stability coefficient is 0.999. Recalculating the required steel structure area A = 4500000 / (205×0.999) = 21973.19, and the wall thickness t = 12 mm can meet the overall stability requirements.

[0040] Local stability calculation: When the wall thickness is taken as 12 mm, the diameter-to-thickness ratio of the steel structure transfer floor at this time = 600 / 12 = 50 ≤ 50, meeting the requirements of section S1 and no local buckling failure will occur.

[0041] (3) Selection of wall thickness 1. Considering the safety factor, the actual wall thickness is selected as 1.2 times the calculated wall thickness.

[0042] 2. Install a rotatable intelligent laser rangefinder above the pile hole position of the static pile press. When the precast pipe pile is sent to the design elevation by the pile feeder, rotate the laser rangefinder above the pile hole, and monitor the distance from the rangefinder to the top steel plate of the pile feeder in real time through the laser rangefinder, so as to achieve the purpose of accurately controlling the pile top elevation, as Figure 1 shown.

[0043] 3. By setting the steel structure annular plate 17 and the stiffener 23, the bonding ability between the concrete of the pile cap 26 and the transfer floor is increased, and the bottom steel bars of the pile cap 26 are welded to the ring plate to ensure the smooth transfer of the upper load to the lower pipe pile.

[0044] 4. The connection between the pipe pile and the steel support is realized by setting the protective cover 25 to sleeve the top of the pipe pile. For details, see Figure 3 .

[0045] 5. After the pipe pile columns are cut off, use P8 impermeable concrete to densely fill the cavities inside the pipe piles and the steel structure transfer layer, and weld an additional steel plate on the upper part of the steel structure transfer layer to completely seal the cavities, ensuring that no water seeps out from the cavities.

[0046] The following problems can also be solved by the above method: 1. The thickness of the foundation slab 27 and the force requirements of PHC pipe piles are different for each project. How to reasonably determine the height and wall thickness of the steel structure transfer layer; 2. During the pile foundation construction process, how to accurately control the steel structure transfer layer to be exactly within the elevation range of the foundation slab 27. What to do if it is lower than the bottom elevation of the foundation slab 27, and what to do if it is higher than the top elevation of the foundation; 3. The design requires that the large-diameter pipe piles extend into the foundation slab 27 by no less than 100 mm, and the small- and medium-diameter pipe piles extend into the foundation slab 27 by no less than 50 mm to ensure the smooth transfer of the upper load to the piles. How to smoothly transfer the upper load to the piles when using the steel structure transfer layer; 4. When using engineering pipe piles and column piles in common, the force problem of the engineering piles as column piles not on the foundation pit support axis is solved by setting the steel section bearing beam 28. However, how to effectively connect the steel section bearing beam 28 and the engineering pipe piles to ensure the stability of the steel internal support; 5. After the internal support and the PHC pipe pile columns are removed, since both the pipe piles and the steel structure transfer layer are hollow, groundwater is likely to seep into the basement from the hollow parts. How to ensure the waterproof effect here.

[0047] In the present invention, during use, first press one of the cement columns 1 into the pile hole by a static pile press, then place the steel pipe 13 with the annular plate 14 on the top of the current cement column 1, that is, on the top of the end cap 3, and make the annular wire 16 located in the annular groove 10, then the positioning work of the steel pipe 13 can be quickly completed. Then press down the steel pipe 13, so that the annular wire 16 is clamped into the hooks 11 of the plurality of metal wires 4 under the action of pressure, and the quick positioning work of the steel pipe 13 can be completed, significantly improving the construction efficiency. Then weld the edge of the annular plate 14 and the edge of the end cap 3 by welding equipment. Immediately place another cement column 1 on the top of the steel pipe 13, and in a similar manner, make the annular wire 16 at the top of the steel pipe 13 clamped into the hooks 11 of the other cement column 1, and weld the end cap 3 on the other one and the annular plate 14 by welding equipment, then the assembly work of the two cement columns 1 can be completed. Since the annular wires 16 at both ends of the reinforcing wire 15 are respectively buckled into the two groups of hooks 11, the metal wires 4 in the two cement columns 1 can also be connected by the reinforcing wire 15. In this way, not only the stress is transmitted only by the steel pipe 13 between the two cement columns 1, effectively reducing the stress concentration phenomenon, but also the overall strength is significantly improved, and it is convenient for construction and installation.

[0048] After the construction of the two cement columns 1 is completed, the pouring construction of the bearing platform 26 and the bottom plate 27 is immediately carried out. During the construction process, the annular plate 17, the reinforcing rib 23 and the V-shaped wire 19 are placed in the bearing platform 26, and the steel bars in the bearing platform 26 pass through the wire-passing holes 18 and the collar 20. Thus, the connection between the bearing platform 26 and the steel pipe 13 can be made closer. And through the arrangement of the V-shaped wire 19 and the reinforcing wire 15, the stress of the metal wire 4 can be directly transmitted to the steel wire and steel bars in the bearing platform 26. In this way, the integrity of the cement column 1 and the bearing platform 26 is better, and the strength is significantly improved. The V-shaped wire 19 and the reinforcing wire 15 can form a triangular structure, and the triangular structure will further improve the integrity and connection strength. After pouring, the top of the steel pipe 13 will protrude from the bottom plate 27.

[0049] After the pouring of the bearing platform 26 and the bottom plate 27 is completed, structural adhesive is applied to the inside of the protective cover 25, and then the protective cover 25 is sleeved on the top of the cement column 1, and then the profiled steel bearing beam 28 is welded to the top of the protective cover 25. Thus, the inner hole 2 at the top of the cement column 1 can be effectively blocked to prevent water from leaking into the inside of the cement column 1 and ensure the service strength of the cement column 1. When the cement column 1 and the profiled steel bearing beam 28 on the upper end surface of the bottom plate 27 are not needed, the steel pipe 13 is cut along the surface of the bottom plate 27, and then cement mortar is poured into the inner hole 2 of the steel pipe 13 and the cement column 1. Finally, the metal plate 29 is welded to the cut of the steel pipe 13 to complete the blocking of the steel pipe 13. In this way, water can be prevented from flowing into the cement column 1 from the cut of the steel pipe 13 and ensure the support strength of the cement column 1 and the bearing platform 26.

[0050] The above are only the preferred embodiments of the present invention, and there is no any form of limitation to the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to be equivalent embodiments with the equivalent changes within the scope of the technical solution of the present invention by using the technical content prompted above. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. A PHC pipe pile support column, comprising two vertically distributed cement columns (1), wherein the top of each cement column (1) is provided with an inner hole (2), characterized in that: Also includes: Two pairs of end covers (3) are respectively fixedly mounted on the two ends of the two cement columns (1). Wherein, each of the end covers (3) is provided with a circular hole (24) aligned with the inner hole (2), and a plurality of metal wires (4) distributed in a circumference are fixedly arranged in the cement column (1); The steel pipe (13) is arranged between the two cement columns (1). Wherein, both ends of the steel pipe (13) are fixedly connected to an annular plate (14), the annular plate (14) and the end cover (3) are fixedly connected by welding, and a reinforcement part connected to two groups of metal wires (4) is provided inside the steel pipe (13); The reinforcement portion comprises a plurality of reinforcement wires (15) fixedly connected between two annular plates (14), both ends of the reinforcement wires (15) being fixedly connected to annular wires (16), and a hook (11) is provided at the top of the metal wire (4), and the hook (11) is suspended on the annular wire (16).

2. A PHC pipe pile support column according to claim 1, characterized in that: An annular groove (10) is provided at the top of the end cover (3), a through hole (12) is provided at the inner bottom of the annular groove (10), and the hook (11) extends into the annular groove (10) through the through hole (12).

3. A PHC pipe pile support column according to claim 1, characterized in that: The inner wall of the end cover (3) is fixedly connected to a plurality of circumferentially distributed support plates (7), the end of each support plate (7) is fixedly connected to a symmetrically arranged clamping plate (8), and the metal wire (4) is clamped between two pairs of clamping plates (8). Wherein, a pair of limit plates (9) are fixedly connected to the outer wall of the metal wire (4), and the limit plates (9) are arranged on the upper and lower sides of the clamping plate (8).

4. A PHC pipe pile support column according to claim 1, characterized in that: The outer wall of each metal wire (4) is provided with a bending area (6), and the bending areas (6) on the plurality of metal wires (4) form an annular limiting area, and a circular ring (5) is fixedly sleeved on the annular limiting area.

5. A PHC pipe pile support column according to claim 4, characterized in that: The outer shape of the bending area (6) is in the shape of the letter W, and the turning point of the bending area is transitioned through an arc.

6. A PHC pipe pile support column according to claim 1, characterized in that: An annular disk (17) is fixedly connected to the outer wall of the lower end of the steel pipe (13); a reinforcing rib (23) is fixedly connected between the top surface of the annular disk (17) and the outer wall of the steel pipe (13); and a threading hole (18) is provided on the outer wall of the reinforcing rib (23); The outer wall of the reinforcing wire (15) is fixedly connected to a V-shaped wire (19) penetrating the outer wall of the steel pipe (13); the outer wall of the steel pipe (13) is fixedly connected to a sleeve (30) sleeved on both ends of the V-shaped wire (19); and the outer wall of the V-shaped wire (19) is fixedly connected to a sleeve ring (20).

7. A PHC pipe pile support column according to claim 1, characterized in that: An annular welding groove (21) is provided at the end edges of the end cover (3) and the annular plate (14), and the inner bottom of the annular welding groove (21) is provided with circumferentially distributed T-shaped grooves (22), and two mutually aligned T-shaped grooves (22) form an I-shaped groove.

8. A PHC pipe pile support column according to claim 1, characterized in that: A protective cover (25) is sleeved on the top of the end cover (3) located at the top, and the inner wall of the protective cover (25) is bonded to the end cover (3) by means of structural adhesive.

9. A construction method for a PHC pipe pile support column, characterized in that: Using a PHC pipe pile support column as described in any one of claims 1 to 8 comprises the following steps: S1. First, one of the cement columns (1) is pressed into the pile hole by a static pile driver; S2, placing a steel pipe (13) with an annular plate (14) on the top of the current cement column (1); S3, causing the annular wire (16) to be stuck into the hooks (11) of the plurality of metal wires (4) under pressure; S4, welding the edge of the annular plate (14) to the edge of the end cover (3) by means of a welding device; S5, then installing another cement column (1) on the top of the steel pipe (13); S6, completing the pouring construction work of the cap (26) and the base plate (27), and placing the annular plate (17), the reinforcing ribs (23) and the V-shaped wire (19) in the cap (26); S7, fixing the protective cover (25) to the top of the cement column (1) by means of structural adhesive, and then welding the steel support beam (28) to the top of the protective cover (25); S8, when the cement column (1) and the steel beam (28) on the upper end surface of the bottom plate (27) are no longer needed, cutting the steel pipe (13) along the surface of the bottom plate (27); S9, pouring cement mortar into the inner hole (2) of the steel pipe (13) and the cement column (1); S10, welding the metal plate (29) to the cutout of the steel pipe (13) to complete the sealing of the steel pipe (13).

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