A PHC pipe pile support column and construction method

Abstract

The present invention discloses a PHC pipe pile support column and a construction method, which relates to the technical field of support columns. A PHC pipe pile support column comprises two vertically distributed cement columns, wherein the top of the cement column is provided with an inner hole, and further comprises: two pairs of end caps, which are fixedly sleeved on both ends of the two cement columns, wherein each end cap is provided with a circular hole aligned with the inner hole, and the cement column is fixed with a plurality of metal wires distributed circumferentially; a steel pipe, which is provided between the two cement columns, wherein both ends of the steel pipe are fixedly connected with an annular plate, and the annular plate and the end cap are fixedly connected by welding; the present invention can make the stress between the two cement columns not only rely on the steel pipe to transmit stress, effectively reduce stress concentration, significantly improve the overall strength, and facilitate construction and installation, while preventing water from flowing into the cement column from the incision of the steel pipe, thereby ensuring the support strength of the cement column and the base.

Description

Technical Field

[0001] The present invention belongs to the technical field of supporting columns, and in particular relates to a PHC pipe pile supporting column and a construction method. Background Art

[0002] To ensure the waterproof effect of the foundation slab, the supporting column piles in the traditional foundation pit are generally made of concrete bored piles with lattice columns inserted on them. However, when all the pile foundations are PHC pipe piles, this solution requires additional on-site bored pile construction machinery, which takes a long construction period and is costly.

[0003] The prior art Chinese patent 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 located within the foundation bottom plate to solve the water-stopping problem), the engineering pipe piles can be used as column piles. However, there are still problems that have not been solved during the application process. For example, the steel structure conversion layer is mainly composed of steel pipes and reinforcement bars, which will result in the upper and lower PHC columns only being able to pass through the steel pipes. Although anchor bars are provided inside, the anchor bars are mainly connected to the ends of the PHC columns by welding, and the ends of the PHC columns are mainly connected to the cement structure through metal end caps. This easily leads to the stress points being mainly concentrated at the ends of the PHC columns, resulting in stress concentration. 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 the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] A PHC pipe pile support column comprises two vertically distributed cement columns, each of the tops of the cement columns being provided with an inner hole, and further comprising: two pairs of end caps, respectively fixedly sleeved on the two ends of the two cement columns, wherein each of the end caps is provided with a circular hole aligned with the inner hole, and a plurality of circumferentially distributed metal wires are fixedly provided in the cement columns; a steel pipe is provided between the two cement columns, wherein both ends of the steel pipe are fixedly connected to an annular plate, the annular plate and the end caps are fixedly connected by welding, and a reinforcement portion connected to the two groups of metal wires is provided in the steel pipe.

[0007] Preferably, the reinforcement portion includes a plurality of reinforcement wires fixedly connected between two annular plates, both ends of the reinforcement wires are fixedly connected with annular wires, and a hook is provided on the top of the metal wire, and the hook is suspended on the annular wire.

[0008] 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.

[0009] 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 splint, and the metal wire is clamped between two pairs of splints, 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 splint.

[0010] Preferably, the outer wall of each metal wire 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.

[0011] 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.

[0012] Furthermore, an annular disk is fixedly connected to the outer wall of the lower end of the steel pipe, and 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, and 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.

[0013] Furthermore, an annular welding groove is provided on the end edges of the end cover and the annular plate, and the inner bottom of the annular welding groove is provided with circumferentially distributed T-shaped grooves, and two mutually aligned T-shaped grooves form an I-shaped groove.

[0014] Furthermore, a protective cover is sleeved on the top of the end cover at the top, and the inner wall of the protective cover is bonded to the end cover by structural adhesive.

[0015] A construction method for a PHC pipe pile support column comprises the following steps:

[0016] S1. First, one of the cement columns is pressed into the pile hole by a static pile driver;

[0017] S2, placing the steel pipe with the annular plate on top of the current cement column;

[0018] S3, causing the looped wire to be stuck into the hooks of the multiple metal wires under pressure;

[0019] S4. Welding the edge of the annular plate to the edge of the end cover using welding equipment;

[0020] S5. Then install another cement column on the top of the steel pipe;

[0021] 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;

[0022] S7. Fix the protective cover to the top of the concrete column using structural adhesive, and then weld the steel joist to the top of the protective cover;

[0023] S8. When the cement columns and steel joists on the upper end of the bottom plate are not needed, cut the steel pipe along the surface of the bottom plate;

[0024] S9, pouring cement mortar into the inner holes of the steel pipe and the cement column;

[0025] S10. Weld the metal plate to the cutout of the steel pipe to complete the sealing of the steel pipe.

[0026] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0027] 1. The present invention makes the annular wires at both ends of the reinforcing wire buckle into two sets of hooks respectively, so that the metal wires in the two cement columns can be connected by the reinforcing wire. In this way, the stress between the two cement columns is not only transmitted by the steel pipe, but also effectively reduces the stress concentration phenomenon, significantly improves the overall strength, and facilitates construction and installation.

[0028] 2. The present invention places an annular disk, reinforcing ribs and V-shaped wires on the cap, and passes the steel bars in the cap through the wire holes and the rings, thereby making the connection between the cap and the steel pipe tighter.

[0029] 3. The present invention can directly transfer the stress of the metal wire to the steel wire and steel bar in the pedestal through the arrangement of V-shaped wire and reinforcing wire, so that the integrity of the cement column and the pedestal is better and the strength is significantly improved. The V-shaped wire and reinforcing wire can form a triangular structure, which will further improve the integrity and connection strength.

[0030] 4. The present invention cuts the steel pipe along the surface of the bottom plate, then pours cement mortar into the inner holes of the steel pipe and the cement column, and finally welds the metal plate 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 from the cut of the steel pipe, thereby ensuring the supporting strength of the cement column and the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In the attached figure:

[0032] Figure 1 This is a schematic diagram of the axonometric structure of a PHC pipe pile support column proposed in the present invention;

[0033] Figure 2 This is a structural diagram of a PHC pipe pile support column proposed by the present invention in use;

[0034] Figure 3 This is a schematic diagram of the axonometric structure of a cement column and a steel pipe of a PHC pipe pile support column proposed in the present invention;

[0035] Figure 4 This is a schematic diagram of a partially cutaway axonometric structure of a PHC pipe pile support column proposed in the present invention;

[0036] Figure 5 A PHC pipe pile support column proposed by the present invention Figure 4 Schematic diagram of the structure of part A;

[0037] Figure 6 This is a schematic diagram of the isometric structure of the metal wire and reinforcing wire of a PHC pipe pile support column proposed in the present invention;

[0038] Figure 7 A PHC pipe pile support column proposed by the present invention Figure 6 Schematic diagram of the local structure;

[0039] Figure 8 This is a schematic diagram of the partial axonometric structure of a steel pipe of a PHC pipe pile support column proposed in the present invention;

[0040] Figure 9 This is a schematic diagram of the axonometric structure of the end cover of a PHC pipe pile support column proposed in the present invention;

[0041] Figure 10 This is a schematic diagram of the steel pipe axonometric structure of a PHC pipe pile support column proposed in the present invention;

[0042] Figure 11 This is a schematic diagram of the steel pipe cutaway axonometric structure of a PHC pipe pile support column proposed in the present invention;

[0043] Figure 12 This is a schematic diagram of the axonometric structure of a protective cover for a PHC pile support column proposed in the present invention;

[0044] Figure 13 This is a structural schematic diagram of a PHC pipe pile support column proposed in the present invention in the final construction state.

[0045] In the figure: 1. Cement column; 2. Inner hole; 3. End cover; 4. Metal wire; 5. Circular ring; 6. Bending area; 7. Support plate; 8. Clamp; 9. Limit plate; 10. Annular groove; 11. Hook; 12. Perforation; 13. Steel pipe; 14. Annular plate; 15. Reinforcement wire; 16. Annular wire; 17. Annular disk; 18. Threading hole; 19. V-shaped wire; 20. Ring; 21. Annular welding groove; 22. T-shaped groove; 23. Reinforcement rib; 24. Circular hole; 25. Protective cover; 26. Cap; 27. Bottom plate; 28. Steel support beam; 29. ​​Metal plate; 30. Casing. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the 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.

[0047] Example 1: Reference Figures 1-13 A PHC pipe pile support column includes two vertically distributed cement columns 1, the cement column 1 is equivalent to the PHC pipe pile, the top of the cement column 1 is penetrated by an inner hole 2, the axial cross-section of the inner hole 2 is circular, and also includes: two pairs of metal end covers 3, respectively fixedly mounted on the two ends of the two cement columns 1, wherein each end cover 3 is provided with a circular hole 24 aligned with the inner hole 2, a plurality of circumferentially distributed metal wires 4 are fixedly arranged in the cement column 1, and 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, wherein both ends of the steel pipe 13 are fixedly connected with an annular plate 14, the annular plate 14 and the end cover 3 are fixedly connected by welding, and a reinforcement part connected to the two groups of metal wires 4 is provided in the steel pipe 13.

[0048] Specifically, when in use, first, one of the cement columns 1 is pressed into the pile hole by a static pile driver, and 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 cover 3, and then the steel pipe 13 and the metal wire 4 are connected by the reinforcement part to complete the rapid positioning of the steel pipe 13, which significantly improves the construction efficiency, and then the edge of the annular plate 14 is welded to the edge of the end cover 3 by welding equipment, and then another cement column 1 is placed on the top of the steel pipe 13, and the top of the steel pipe 13 is connected to the other cement column 1 in a similar way, and the end cover 3 on the other is welded to the annular plate by welding equipment. 14 welding, the assembly of the two cement columns 1 can be completed. Due to the setting of the reinforcement part, the metal wires 4 in the two cement columns 1 can also be connected through the reinforcement part, so that the stress between the two cement columns 1 is not only transmitted by the steel pipe 13, but also the stress concentration phenomenon is effectively reduced, the overall strength is significantly improved, and it is convenient for construction and installation. After the construction of the two cement columns 1 is completed, the pouring construction of the base 26 and the bottom plate 27 is completed immediately. During the construction process, the steel pipe 13 is placed in the base 26, and the top of the steel pipe 13 is exposed to the bottom plate 27, and then the steel joist 28 is installed on the top of the top cement column 1.

[0049] An annular welding groove 21 is provided at the end edges of the end cover 3 and the annular plate 14 , and a circumferentially distributed T-shaped groove 22 is provided at the inner bottom of the annular welding groove 21 . Two mutually aligned T-shaped grooves 22 form an I-shaped groove.

[0050] Specifically, when welding the annular plate 14 to the end cover 3, the two aligned annular welding grooves 21 eliminate the need for a reserved weld between the two, making the welding work more convenient and the connection strength between the two better. The I-shaped groove formed by the two groups of T-shaped grooves 22 will cause the welding material to form an I-shaped structure, thereby making the connection between the annular plate 14 and the end cover 3 tighter and the strength significantly improved.

[0051] A protective cover 25 is sleeved on the top of the end cover 3 at the top, and the inner wall of the protective cover 25 is bonded to the end cover 3 by structural adhesive; after the base 26 and the base plate 27 are cast, 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 support 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 sealed to prevent water from leaking into the interior of the cement column 1, thereby ensuring the service strength of the cement column 1.

[0052] Example 2: Reference Figure 3-Figure 6 , a PHC pipe pile support column, which is basically the same as Example 1, further comprising:

[0053] The above-mentioned reinforcement part includes a plurality of reinforcing wires 15 fixedly connected between the two annular plates 14, and both ends of the reinforcing wire 15 are fixedly connected with an annular wire 16. A hook 11 is provided at the top of the metal wire 4, and the hook 11 is suspended on the annular wire 16. The reinforcing wire 15, the annular wire 16 and the hook 11 are all made of steel wire or steel bar, and the annular wire 16 is connected to the reinforcing wire 15 by welding. An annular groove 10 is provided at the top of the end cover 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.

[0054] When in use, first, one of the cement columns 1 is pressed into the pile hole by a static pile driver, and 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 cover 3, and the annular wire 16 is located in the annular groove 10, which can quickly complete the positioning of the steel pipe 13, and then press the steel pipe 13 downward so that the annular wire 16 is stuck in the hooks 11 of the multiple metal wires 4 under the action of pressure, which can complete the rapid positioning of the steel pipe 13, significantly improving the construction efficiency, and then weld the edge of the annular plate 14 to the edge of the end cover 3 by welding equipment, and then put another cement column 1 Place it on the top of the steel pipe 13, and use a similar method to make the annular wire 16 on the top of the steel pipe 13 stuck in the hook 11 of another cement column 1, and weld the end cover 3 on the other one to the annular plate 14 through welding equipment, and the assembly 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 in the two groups of hooks 11, the metal wires 4 in the two cement columns 1 can also be connected through the reinforcing wire 15, so that the stress between the two cement columns 1 is not only transmitted by the steel pipe 13, but also effectively reduces the stress concentration phenomenon, significantly improves the overall strength, and facilitates construction and installation.

[0055] Example 3: Reference Figure 4-Figure 7 , a PHC pipe pile support column, which is basically the same as Example 2, further comprising:

[0056] The inner wall of the above-mentioned end cover 3 is fixedly connected with a plurality of circumferentially distributed support plates 7, and the end of each support plate 7 is fixedly connected with a symmetrically arranged clamping plate 8, and the metal wire 4 is clamped between the two pairs of clamping plates 8, wherein the outer wall of the metal wire 4 is fixedly connected with a pair of limit plates 9, and the limit plates 9 are arranged on the upper and lower sides of the clamping plate 8.

[0057] Specifically, when casting the PHC pile, the positioning of the metal wire 4 can be quickly completed by setting the splint 8, thereby facilitating the rapid casting of the PHC pile, and the support plate 7 will make the connection between the end cover 3 and the metal wire 4 tighter. In practice, in order to improve the strength, the metal wire 4 and the splint 8 can also be welded together.

[0058] The outer wall of each metal wire 4 is provided with a bending area 6, and the bending areas 6 on the 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 point of the bending area is transitioned through an arc.

[0059] Specifically, after completing the layout of the metal wire 4, the metal ring 5 is placed in the annular limiting area formed by the bending area 6, so that the stability between the multiple metal wires 4 is higher, thereby improving the supporting strength of the PHC pile. In practice, the ring 5 and the metal wire 4 are welded together, which can improve the connection strength between the ring 5 and the metal wire 4, and the design of the bending area 6 makes the positioning and installation of the ring 5 more convenient.

[0060] Example 4: Reference Figure 1-Figure 4 as well as Figure 6 、 Figure 8 、 Figure 11 , a PHC pipe pile support column, which is basically the same as Example 3, further comprising:

[0061] The outer wall of the lower end of the above-mentioned steel pipe 13 is fixedly connected with an annular disk 17, and 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. The outer wall of the reinforcing rib 23 is provided with a wire threading hole 18; the outer wall of the reinforcing wire 15 is fixedly connected with a V-shaped wire 19 that penetrates the outer wall of the steel pipe 13. The material of the V-shaped wire 19 is steel wire or steel bar. The outer wall of the steel pipe 13 is fixedly connected with a sleeve 30 that is sleeved on both ends of the V-shaped wire 19, and the outer wall of the V-shaped wire 19 is fixedly connected with a ring 20.

[0062] During the construction of the pedestal 26 and the base plate 27, the annular disk 17, the reinforcing ribs 23 and the V-shaped wire 19 are placed in the pedestal 26, and the steel bars in the pedestal 26 are passed through the wire holes 18 and the rings 20, so that the connection between the pedestal 26 and the steel pipe 13 can be made tighter, and the stress of the metal wire 4 can be directly transferred to the steel wire and the steel bars in the pedestal 26 through the arrangement of the V-shaped wire 19 and the reinforcing wire 15. In this way, the integrity of the cement column 1 and the pedestal 26 is better, and the strength is significantly improved. The V-shaped wire 19 and the reinforcing wire 15 can form a triangular structure, which will further improve the integrity and connection strength. After the pouring is completed, the top of the steel pipe 13 will extend out of the base plate 27.

[0063] Example 5: Reference Figures 1-13 A construction method for a PHC pipe pile supporting column comprises the following steps:

[0064] S1, firstly, one of the cement columns 1 is pressed into the pile hole by a static pile driver;

[0065] S2, placing the steel pipe 13 with the annular plate 14 on the top of the current cement column 1;

[0066] S3, the loop wire 16 is clamped into the hooks 11 of the plurality of metal wires 4 under pressure;

[0067] S4. Weld the edge of the annular plate 14 to the edge of the end cover 3 using welding equipment;

[0068] S5, then install another cement column 1 on the top of the steel pipe 13;

[0069] S6. Complete the pouring construction of the cap 26 and the base plate 27, and place the annular plate 17, the reinforcing ribs 23 and the V-shaped wire 19 in the cap 26;

[0070] S7. Fix the protective cover 25 to the top of the cement column 1 using structural adhesive, and then weld the steel joist 28 to the top of the protective cover 25;

[0071] S8. When the cement column 1 and the steel joist 28 on the upper end surface of the bottom plate 27 are no longer needed, the steel pipe 13 is cut along the surface of the bottom plate 27;

[0072] S9, pouring cement mortar into the inner hole 2 of the steel pipe 13 and the cement column 1;

[0073] S10 , welding the metal plate 29 to the cutout of the steel pipe 13 to complete the sealing of the steel pipe 13 .

[0074] More specifically, the calculation method for the height and wall thickness of the steel structure conversion layer, that is, the steel pipe 13 (according to the "Steel Structure Design Standard" GB50017-2017).

[0075] ①Method for determining the height of steel structure transfer layer:

[0076] The height of the transfer layer h = the height of the pedestal 26 - the height of the pile top buried in the pedestal 26 + 30 to 50 mm. This method reserves construction errors while ensuring that the requirements of the specifications are met, and the steel structure transfer layer is higher than the bottom plate 27, which facilitates subsequent cutting operations.

[0077] ②Method for determining the wall thickness of steel structure conversion layer:

[0078] (1) Preliminary estimation of wall thickness

[0079] The thickness of the steel structure transfer layer 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, the bearing capacity design value of the 600mm diameter PHC pile is 4500KN. When Q235 steel (the compressive strength design value is 205N / mm2 / ) is used, the required steel structure area A=4500000 / 205=21951.22mm2 / , that is, the wall thickness t=12mm can meet the bearing capacity requirements.

[0080] (2) Stability review

[0081] Overall stability calculation: If the height of pedestal 26 is 1000mm, the PHC pile with a diameter of 600mm is buried 50mm into pedestal 26, the thickness of the steel structure transfer layer is h=1000-50+50=1000mm, the turning radius of the round steel pipe with a wall thickness of 12mm is i=√I / A=208mm, the slenderness ratio is l=100 / 208=4.81, and the stability coefficient is 0.999 from the table. The required steel structure area A=4500000 / (205×0.999)=21973.19 is recalculated, and the wall thickness t=12mm can meet the overall stability requirements.

[0082] Local stability calculation: When the wall thickness is 12mm, the diameter-to-thickness ratio of the steel structure conversion layer = 600 / 12 = 50≤50, which meets the S1 section requirements and will not cause local buckling failure.

[0083] (3) Wall thickness selection

[0084] 1. Taking into account the safety factor, the actual wall thickness is selected as 1.2 times the calculated wall thickness.

[0085] 2. Install a rotatable intelligent laser distance meter above the pile hole of the static pile driver. When the prefabricated pipe pile is delivered to the designed elevation by the pile driver, rotate the laser distance meter to the top of the pile hole. The laser distance meter monitors the distance from the distance meter to the top steel plate of the pile driver in real time, thereby achieving the purpose of accurately controlling the pile top elevation. Figure 1 shown.

[0086] 3. The bonding capacity between the concrete of the pedestal 26 and the transfer layer is increased by setting the steel structure annular plate 17 and the reinforcement ribs 23, and the steel bars at the bottom of the pedestal 26 are welded to the annular plate to ensure that the upper load is smoothly transferred to the lower pipe piles.

[0087] 4. The connection between the pipe pile and the steel support is achieved by setting a protective cover 25 on the top of the pipe pile. Figure 3 .

[0088] 5. After the pipe pile columns are removed, P8 anti-seepage concrete is used to fill the cavity inside the pipe piles and the steel structure transfer layer tightly, and a steel plate is welded on the upper part of the steel structure transfer layer to completely seal the cavity to ensure that no water seeps out of the cavity.

[0089] The above method can also solve the following problems:

[0090] 1. The thickness of the foundation slab 27 and the force requirements of the PHC piles are different for each project. How to reasonably determine the height and wall thickness of the steel structure transfer layer?

[0091] 2. How to accurately control the steel structure transfer layer to be exactly within the 27-degree elevation range of the foundation bottom plate during the pile foundation construction process? If it is lower than the 27-degree elevation of the foundation bottom plate, how to deal with it? If it is higher than the top elevation of the foundation, how to deal with it?

[0092] 3. The design requires that large-diameter pipe piles extend into the foundation slab 27 to a height of at least 100 mm, and small and medium-diameter pipe piles extend into the foundation slab 27 to a height of at least 50 mm to ensure smooth transfer of upper loads to the piles. When using a steel structure transfer layer, how can the upper loads be smoothly transferred to the piles?

[0093] 4. When using engineering pipe piles and column piles together, the problem of the engineering piles being not on the foundation pit support axis is solved by setting up steel joists 28. However, how to effectively connect the steel joists 28 with the engineering pipe piles to ensure the stability of the steel internal support?

[0094] 5. After the internal support and PHC pipe pile columns are removed, since the pipe piles and steel structure transfer layer are hollow, groundwater can easily leak into the basement from the hollow parts. How to ensure the waterproof effect here?

[0095] The present invention, when in use, firstly press one of the cement columns 1 into the pile hole by a static pile driver, then place the steel pipe 13 with the annular plate 14 on the top of the current cement column 1, that is, the top of the end cap 3, and make the annular wire 16 be located in the annular groove 10, so that the positioning work of the steel pipe 13 can be completed quickly, and then press the steel pipe 13 downward so that the annular wire 16 is stuck in the hooks 11 of the multiple metal wires 4 under the action of pressure, so that the rapid positioning work of the steel pipe 13 can be completed, which significantly improves the construction efficiency, and then weld the edge of the annular plate 14 to the edge of the end cap 3 by welding equipment, and then put another cement column 13 on the top of the end cap 3. The column 1 is placed on the top of the steel pipe 13, and a similar method is used to make the annular wire 16 on the top of the steel pipe 13 stuck in the hook 11 of another cement column 1, and the end cover 3 on the other is welded to the annular plate 14 through welding equipment to complete the assembly of the two cement columns 1. Since the annular wires 16 at both ends of the reinforcing wire 15 are respectively buckled in the two groups of hooks 11, the metal wires 4 in the two cement columns 1 can also be connected through the reinforcing wire 15. In this way, the stress between the two cement columns 1 is not only transmitted by the steel pipe 13, but also the stress concentration phenomenon is effectively reduced, the overall strength is significantly improved, and it is convenient for construction and installation.

[0096] After the construction of the two cement columns 1 is completed, the pouring construction of the pedestal 26 and the base plate 27 is completed immediately. During the construction process, the annular disk 17, the reinforcing ribs 23 and the V-shaped wire 19 are placed in the pedestal 26, and the steel bars in the pedestal 26 are passed through the wire holes 18 and the rings 20, so that the connection between the pedestal 26 and the steel pipe 13 can be made tighter, and the arrangement of the V-shaped wire 19 and the reinforcing wire 15 can make the stress of the metal wire 4 directly transferred to the steel wire and the steel bars in the pedestal 26, so that the integrity of the cement column 1 and the pedestal 26 is better, and the strength is significantly improved, and the V-shaped wire 19 and the reinforcing wire 15 can form a triangular structure, which will further improve the integrity and connection strength. After the pouring is completed, the top of the steel pipe 13 will extend out of the base plate 27.

[0097] After the foundation 26 and the base plate 27 are cast, structural glue is applied to the inside of the protective cover 25, and then the protective cover 25 is put on the top of the cement column 1, and then the steel joist 28 is welded to the top of the protective cover 25. This can effectively seal the inner hole 2 at the top of the cement column 1 to prevent water from leaking into the interior of the cement column 1, thereby ensuring the service strength of the cement column 1. When the cement column 1 and the steel joist 28 on the upper end face of the base plate 27 are no longer needed, the steel pipe 13 is cut along the surface of the base plate 27, and then cement mortar is poured into the steel pipe 13 and the inner hole 2 of the cement column 1. Finally, the metal plate 29 is welded to the incision of the steel pipe 13 to complete the sealing of the steel pipe 13. This can prevent water from flowing into the cement column 1 from the incision of the steel pipe 13, thereby ensuring the supporting strength of the cement column 1 and the foundation 26.

[0098] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution 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 caps (3) are fixedly mounted on both ends of the two cement columns (1). Each of the end caps (3) is provided with a circular hole (24) aligned with the inner hole (2), and a plurality of metal wires (4) distributed circumferentially are fixedly provided 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 portion connected to two sets 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) are fixedly connected to annular wires (16), a hook (11) is provided at the top of the metal wire (4), and the hook (11) is suspended on the annular wire (16); The inner wall of the end cover (3) is fixedly connected to a plurality of circumferentially distributed support plates (7), and 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 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 plate (8).

2. A PHC pipe pile support column according to claim 1, characterized in that: An annular groove (10) is provided on the top of the end cover (3), a through-hole (12) is provided on 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 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.

4. A PHC pipe pile support column according to claim 3, 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.

5. The 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) that penetrates the outer wall of the steel pipe (13); the outer wall of the steel pipe (13) is fixedly connected to a sleeve (30) that is 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 collar (20).

6. 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.

7. The 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 structural adhesive.

8. A construction method for a PHC pipe pile supporting column, characterized in that: Using a PHC pipe pile supporting column as described in any one of claims 1 to 7 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 the steel pipe (13) with the annular plate (14) on top of the current cement column (1); S3, causing the ring wire (16) to be clamped 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) using a welding device; S5, then install another cement column (1) on the top of the steel pipe (13); S6, completing the pouring construction work of the pedestal (26) and the base plate (27), and placing the annular disk (17), the reinforcing ribs (23) and the V-shaped wire (19) in the pedestal (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 cut of the steel pipe (13) to complete the sealing of the steel pipe (13).

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