PHC prestressed pipe pile head plugging process

Abstract

The application relates to a PHC prestressed pipe pile head plugging process, which comprises the following steps: step 1, measuring and lofting the construction site to determine the hole position; step 2, spraying and filling polyurethane foaming agent on the inner wall of the prefabricated pile until the internal space of the prefabricated pile is filled to saturation, and spraying water or sprinkling water on the inner wall of the prefabricated pile during the spraying and filling; step 3, welding and fixing the pile tip piece with the prefabricated pile; step 4, hole drilling at the hole position; and step 5, pile pressing of the prefabricated pile, and the prefabricated pile is pressed into the hole from the hole position. The application can improve the anti-seepage effect of the pipe pile.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of building construction, in particular to a PHC prestressed pipe pile head plugging process. BACKGROUND

[0002] With the continuous development and innovation of building process and other related technologies, the prefabricated pipe pile technology is applied more and more widely in pile foundation construction. In construction, the prefabricated pipe pile is usually sent into the soil by using the static pressure method or the hammering method. In order to prevent the infiltration of rainwater or surface water and other water sources into the bearing layer and cause the bearing capacity damage, the pipe pile is usually filled with concrete for bottom sealing. At present, the common method for bottom sealing is to fill the expanded fine aggregate concrete into the pile bottom. After the pressure on the first pile is completed, the fine aggregate concrete is filled into the pipe. The concrete is easy to segregate in the falling process. The pipe pile is long, and the vibration rod cannot be used for compaction. The concrete is scattered on the inner wall of the long pipe pile or the concrete at the pipe bottom is loose and cannot form an effective whole, so that the anti-seepage effect is poor. Moreover, the filling construction process is staggered with the pile pressing construction, so that the construction quality is difficult to guarantee, the ideal anti-seepage effect is difficult to achieve, and the construction efficiency is affected. SUMMARY

[0003] In order to improve the anti-seepage effect of the pipe pile, the application provides a PHC prestressed pipe pile head plugging process.

[0004] In one aspect, the application provides a PHC prestressed pipe pile head plugging process, which adopts the following technical scheme:

[0005] A PHC prestressed pipe pile head plugging process, comprising:

[0006] Step 1: measuring and laying out the construction site to determine the hole position;

[0007] Step 2: spraying and filling polyurethane foaming agent on the inner wall of the prefabricated pile until the internal space of the prefabricated pile is filled full. Water is sprayed or sprinkled on the inner wall of the prefabricated pile during the spraying and filling;

[0008] Step 3: welding and fixing the pile tip piece to the prefabricated pile;

[0009] Step 4: hole drilling at the hole position;

[0010] Step 5: pressing the prefabricated pile into the hole from the hole position.

[0011] By adopting the technical scheme, the prefabricated pile is filled before pile pressing construction, the sprayed polyurethane foaming agent adheres and expands on the inner wall of the prefabricated pile, the expanded polyurethane foaming agent can play a blocking role on water, and after the inner wall of the prefabricated pile is filled with the polyurethane foaming agent, an effective whole is formed, water is difficult to infiltrate, the anti-seepage effect is improved, compared with the existing construction technology, the bottom sealing is completed before pile pressing, the situation that the bottom sealing construction is inserted in the pile pressing process can be avoided, the cross operation situation is reduced, the influence on the construction efficiency and the construction quality is reduced, and the construction cost is reduced, the environment is protected, and the method is practical.

[0012] Optionally, a step 1a is added between the step 1 and the step 2: cutting the hard paper skin into a shape that meets the temporary sealing and plugging position of the inner bottom of the prefabricated pile, then putting the cut hard paper skin into the inner bottom of the prefabricated pile, and fixing the hard paper skin at the inner bottom of the prefabricated pile.

[0013] By adopting the technical scheme, the polyurethane foaming agent can be easily filled in the pile core, when the polyurethane foaming agent is filled to a sufficient amount, the hard paper skin can block the polyurethane foaming agent, so that the filling height of the polyurethane foaming agent can be controlled, the situation that the polyurethane foaming agent leaks out of the prefabricated pile due to excessive spraying of the polyurethane foaming agent is reduced, and the waste of the polyurethane foaming agent is reduced.

[0014] Optionally, the step 2 includes a step 2.1 and a step 2.2, the step 2.1 is: spraying the polyurethane foaming agent on the inner wall of the prefabricated pile, filling the inner wall of the prefabricated pile into a closed ring or a pipe, and forming a foaming agent layer; and the step 2.2 is: after the first-sprayed polyurethane foaming agent is hardened, the second-sprayed polyurethane foaming agent is sprayed again, the inner part of the prefabricated pile is filled to be full, and a foaming agent core is formed.

[0015] By adopting the technical scheme, the first-sprayed polyurethane foaming agent is first attached to the inner wall of the prefabricated pile, and is fixed to the inner wall of the prefabricated pile after being hardened, the possible gaps between the polyurethane foaming agents are reduced, the second-sprayed polyurethane foaming agent is bonded to the first-sprayed polyurethane foaming agent, and the pile tip piece can be welded to the prefabricated pile after the second-sprayed polyurethane foaming agent is sprayed, without waiting for the second-sprayed polyurethane foaming agent to be completely expanded.

[0016] On the other hand, the application provides a PHC prestressed pipe pile, which adopts the following technical scheme:

[0017] The utility model provides a kind of PHC prestressed pipe pile, including prefabricated pile, the inside of the prefabricated pile is provided with foaming agent layer and foaming agent core, the foaming agent layer is consistent with the inner side wall of prefabricated pile, the foaming agent layer is located between foaming agent core and prefabricated pile, the side wall of foaming agent layer is consistent with foaming agent core, the bottom end of the prefabricated pile is provided with pile tip piece.

[0018] By adopting the above technical scheme, the prefabricated pile is filled with foaming agent instead of concrete, forming a foaming agent layer and a foaming agent core inside the prefabricated pile, which together form an effective whole with the prefabricated pile, and are not prone to water seepage. Moreover, the foaming agent can be filled before pile pressing, avoiding the mutual interlacing of bottom sealing construction and pile pressing construction, reducing the occurrence of cross operation, and reducing the adverse effects on the construction quality of bottom sealing construction, thereby improving the anti-seepage effect.

[0019] Optionally, the bottom end of the prefabricated pile is provided with a plug welding column, the pile tip piece includes a baffle and a pile tip plate, the plug welding column is inserted through the baffle, the baffle abuts against the bottom end of the prefabricated pile, the baffle is fixed to the prefabricated pile, the pile tip plate is fixed to the baffle, the inner side wall of the prefabricated pile is provided with a sealing plate, and the foaming agent layer and the foaming agent core are located between the sealing plate and the baffle.

[0020] By adopting the above technical scheme, the sealing plate can be arranged on the inner side wall of the prefabricated pile before the foaming agent is sprayed, and the sealing plate can block the foaming agent when it is sprayed, thereby facilitating the control of the amount of foaming agent and reducing the leakage of foaming agent. After the interior of the prefabricated pile is filled with foaming agent, the baffle can be abutted against the bottom end of the prefabricated pile, the plug welding column can be inserted through the baffle, and the baffle and the prefabricated pile can be welded, so that the interior of the prefabricated pile has good airtightness and is not prone to water seepage.

[0021] Optionally, the top end of the prefabricated pile is provided with a connecting pile, and the end of the connecting pile is provided with a connecting barrel, the axis of the connecting barrel coincides with the axis of the connecting pile, and the connecting barrel is inserted into the top end of the prefabricated pile.

[0022] By adopting the above technical scheme, the top end of the prefabricated pile can be connected to the connecting pile during pile pressing, the connecting barrel can be inserted into the prefabricated pile during pile connection, and the connecting barrel and the prefabricated pile can be positioned relative to each other, so that the prefabricated pile and the connecting pile are not prone to deviation, and the prefabricated pile and the connecting pile can be easily welded.

[0023] Optionally, the end of the connecting barrel away from the connecting pile is provided with a clamping sliding block, the top end of the prefabricated pile is provided with a connecting groove for inserting the connecting barrel, the groove bottom of the connecting groove is provided with an insertion groove for inserting the clamping sliding block, the side wall of the insertion groove is provided with a clamping groove, and the shape and size of the clamping groove are adapted to the shape and size of the clamping sliding block.

[0024] By adopting the technical scheme, when the pile is connected, the connecting barrel is inserted into the connecting groove, the clamping sliding block is inserted into the insertion groove, then the connecting pile is rotated, the clamping sliding block is slid into the clamping groove, and the connecting pile is not easy to be separated from the precast pile, thereby facilitating the welding of the precast pile and the connecting pile.

[0025] Optionally, the top of the connecting pile is provided with a top abutment, the outer wall of the top abutment abuts against the inner side wall of the connecting pile, the outer wall of the top abutment is provided with a sliding groove, an inner insertion block is slidably connected in the sliding groove, the inner insertion block is inserted into the inner side wall of the connecting pile, the side wall of the sliding groove is provided with an outer top elastic member, the outer top elastic member is connected with the inner insertion block, the top surface of the top abutment is provided with a limiting groove, the limiting groove is in communication with the sliding groove, a limiting plate is slidably connected in the limiting groove, the side wall of the limiting plate is provided with a through hole, and the size of the through hole is greater than the size of the slot of the sliding groove.

[0026] By adopting the technical scheme, after the connecting pile is connected with the precast pile, the connecting pile can be pressed, after the pressing is completed, the top abutment can be placed in the inside of the connecting pile, the sliding groove is aligned with the inner side wall of the connecting pile, the limiting plate is slid, the through hole of the limiting plate is in communication with the sliding groove, the inner insertion block is slid under the pushing of the outer top elastic member, the inner insertion block passes through the through hole and penetrates the outer side wall of the top abutment, and then is inserted into the inner side wall of the connecting pile, so that the top abutment is fixed on the connecting pile. The top abutment can block the upper part of the connecting pile, reduce the water inflow of the connecting pile, and improve the waterproofness of the connecting pile.

[0027] Optionally, the bottom of the limiting groove is provided with an upper top elastic member, the upper top elastic member is connected with the limiting plate, and the inner side wall of the connecting pile is provided with an inner insertion groove for inserting the inner insertion block along the extension direction of the connecting pile.

[0028] By adopting the technical scheme, when the top abutment is not installed with the precast pile, the upper top elastic member can make the limiting plate top out of the top surface of the top abutment, the inner insertion block is pushed against the side wall of the limiting plate under the pushing of the outer top elastic member, and is difficult to move out of the outer wall of the top abutment, so as to facilitate the placement of the top abutment in the connecting pile for fixation. The inner insertion groove is provided along the extension direction of the connecting pile, so that the top abutment can be installed after the connecting pile is cut at any height.

[0029] Optionally, the outer wall of the top abutment is provided with a leakage prevention ring, and the side wall of the leakage prevention ring is connected with the inner side wall of the connecting pile.

[0030] By adopting the technical scheme, the waterproofness of the inside of the connecting pile can be further improved.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] 1. Before the pile pressing construction of the prefabricated pile, the prefabricated pile is filled first, and the sprayed polyurethane foaming agent adheres and expands on the inner wall of the prefabricated pile, the expanded polyurethane foaming agent can play a blocking role on water, and after the inner wall of the prefabricated pile is filled with polyurethane foaming agent, an effective whole is formed, so that water is difficult to infiltrate, thereby improving the anti-seepage effect, and compared with the existing construction technology, the bottom sealing is completed before the pile pressing, which can avoid the situation that the bottom sealing construction is inserted in the pile pressing process, reduce the cross operation, reduce the influence on the construction efficiency and construction quality, and at the same time, the sprayed polyurethane foaming agent is used instead of traditional concrete for bottom sealing, which can reduce the construction cost and is environmentally friendly and practical.

[0033] 2. When the polyurethane foaming agent is filled enough, the hard paper skin can block the polyurethane foaming agent, so that the filling height of the polyurethane foaming agent can be controlled, the situation that the polyurethane foaming agent leaks out of the prefabricated pile due to too much polyurethane foaming agent is reduced, and the waste of polyurethane foaming agent is reduced.

[0034] 3. The prefabricated pile is filled with foaming agent instead of concrete to form a foaming agent layer and a foaming agent core in the prefabricated pile, and together with the prefabricated pile, an effective whole is formed, which is not easy to seep water, and the foaming agent can be filled before the pile pressing, avoiding the mutual insertion of the bottom sealing construction and the pile pressing construction, reducing the cross operation, reducing the adverse influence on the construction quality of the bottom sealing construction, and thereby improving the anti-seepage effect. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a partial sectional view of the prefabricated pile and the connecting pile in the embodiment of the application.

[0036] Figure 2 It is a partial sectional view of the top abutment in the embodiment of the application.

[0037] BRIEF DESCRIPTION OF DRAWINGS:

[0038] 1, prefabricated pile; 11, foaming agent layer; 12, foaming agent core; 13, plug welding column; 14, sealing plate; 15, connecting groove; 16, insertion slot; 161, clamping groove; 17, first clamping block; 18, second clamping block; 21, baffle; 22, pile tip plate; 3, connecting pile; 31, connecting cylinder; 32, clamping sliding block; 33, inner insertion groove; 4, top abutment; 41, sliding slot; 42, inner insertion block; 43, outer top elastic member; 44, limiting groove; 45, limiting plate; 451, through hole; 452, upper top elastic member; 46, leakage prevention ring. DETAILED DESCRIPTION

[0039] The application will be described in further detail below with reference to the accompanying drawings. Figures 1-2 The application will be described in further detail below with reference to the accompanying drawings.

[0040] The embodiment of the application discloses a PHC prestressed pipe pile.

[0041] Referring to Figure 1 A PHC prestressed pipe pile, comprising a prefabricated pile 1, the inside of the prefabricated pile 1 is provided with a foaming agent layer 11, the foaming agent layer 11 is made of polyurethane foaming agent, the foaming agent layer 11 is formed by spraying and then solidifying, the outer side wall of the foaming agent layer 11 is attached to the inner side wall of the prefabricated pile 1, the foaming agent layer 11 is in a tubular shape, the inside of the prefabricated pile 1 is further provided with a foaming agent core 12, the foaming agent core 12 is made of polyurethane foaming agent, the foaming agent core 12 is formed by spraying and then solidifying, the foaming agent core 12 is in a columnar shape, the foaming agent layer 11 is located between the outer side wall of the foaming agent core 12 and the inner side wall of the prefabricated pile 1, and the outer side wall of the foaming agent core 12 is attached to the inner side wall of the foaming agent layer 11.

[0042] When the prefabricated pile 1 needs to be poured and bottom-sealed, the concrete bottom-sealing can be abandoned, and the polyurethane foaming agent can be used to replace the concrete, the polyurethane foaming agent can be sprayed twice, the polyurethane foaming agent is sprayed on the inner side wall of the prefabricated pile 1 in the first spraying, so that the polyurethane foaming agent covers the inner side wall of the prefabricated pile 1, after the polyurethane foaming agent is hardened, the foaming agent layer 11 is formed, the second spraying can be performed, after the polyurethane foaming agent sprayed in the second spraying is expanded and hardened, the foaming agent core 12 is formed, the remaining space in the prefabricated pile 1 is filled, and thus the bottom-sealing of the prefabricated pile 1 is completed, the polyurethane foaming agent has the characteristics of high expansion and waterproof, the prefabricated pile 1, the foaming agent layer 11 and the foaming agent core 12 form an integrated whole, the gap in the prefabricated pile 1 is greatly reduced, the prefabricated pile 1 is not easy to produce segregation, the sealing is dense, the polyurethane foaming agent has a good anti-seepage effect on water, and thus the anti-seepage effect of the prefabricated pile 1 is improved.

[0043] Compared with the concrete, the polyurethane foaming agent has a lighter quality, the prefabricated pile 1 can be bottom-sealed before being pressed, the prefabricated pile 1 is pressed after the bottom-sealing is completed, and thus the bottom-sealing and the pressing can be avoided from being staggered, the construction process of the prefabricated pile 1 has good continuity, and the construction efficiency is improved.

[0044] Compared with the concrete bottom-sealing, the polyurethane foaming agent has a lighter quality, the tank-type polyurethane foaming agent is convenient to carry and use, has a lower cost, and has a lower construction difficulty during the bottom-sealing, and thus the construction cost can be greatly reduced.

[0045] The bottom end of the prefabricated pile 1 is fixedly provided with a plug-welding column 13, the bottom end of the prefabricated pile 1 is provided with a pile tip piece, the pile tip piece comprises a baffle 21 and a pile tip plate 22, the pile tip plate 22 is fixed to the side, away from the prefabricated pile 1, of the baffle 21, the plug-welding column 13 is inserted into the baffle 21, the side, away from the pile tip plate 22, of the baffle 21 abuts against the bottom end face of the prefabricated pile 1, and the baffle 21 is fixed to the prefabricated pile 1 by welding.

[0046] The baffle plate 21 can be abutted to the bottom end of the precast pile 1 after the bottom sealing is completed, the plug welding column 13 is inserted through the baffle plate 21, the baffle plate 21 and the bottom end of the precast pile 1 are abutted to each other, the baffle plate 21 and the precast pile 1 are welded, the baffle plate 21 seals and blocks the bottom end of the precast pile 1, the foaming agent layer 11 and the foaming agent core 12 inside the precast pile 1 are protected, the damage of the foaming agent layer 11 and the foaming agent core 12 is reduced, and when the pile is pressed, the pile tip plate 22 can break the soil layer below the precast pile 1, so that the precast pile 1 is conveniently pressed downward.

[0047] The plug welding column 13 can position the baffle plate 21, so that the baffle plate 21 and the precast pile 1 are not easy to deviate, after insertion, the plug welding column 13 and the baffle plate 21 can be welded, the welding area between the precast pile 1 and the baffle plate 21 is increased, and the stability between the precast pile and the baffle plate 21 is improved.

[0048] The inner side wall of the precast pile 1 is provided with the sealing plate 14, the inner side wall of the precast pile 1 is fixed with the first clamping block 17 and the second clamping block 18, the side wall of the sealing plate 14 is provided with a notch through which the first clamping block 17 passes, the shape and size of the second clamping block 18 are larger than those of the notch on the sealing plate 14, the sealing plate 14 is clamped between the first clamping block 17 and the second clamping block 18, the foaming agent layer 11 and the foaming agent core 12 are located between the sealing plate 14 and the baffle plate 21, the side of the foaming agent layer 11 away from the baffle plate 21 abuts against the side of the sealing plate 14 close to the baffle plate 21, and the side of the foaming agent core 12 away from the baffle plate 21 abuts against the side of the sealing plate 14 close to the baffle plate 21.

[0049] The sealing plate 14 can be clamped between the first clamping block 17 and the second clamping block 18 before the foaming agent is sprayed, so that the sealing plate 14 is fixed in the precast pile 1, then the inside of the precast pile 1 is sprayed with the foaming agent, and the sealing plate 14 can block the foaming agent during the spraying process, so that the amount of the foaming agent can be controlled, the leakage of the foaming agent is reduced, after the spraying and filling of the foaming agent are completed, the inside of the precast pile 1 is filled with the foaming agent, the baffle plate 21 can be welded and fixed to the bottom end of the precast pile 1, so that the bottom end of the precast pile 1 is sealed, and the anti-seepage effect is improved.

[0050] The sealing plate 14 is provided with a handle, so that the sealing plate 14 can be put into the precast pile 1 for clamping.

[0051] The top of the precast pile 1 is provided with the connecting pile 3, one end of the connecting pile 3 close to the precast pile 1 is provided with the connecting barrel 31, the axis of the connecting barrel 31 coincides with the axis of the connecting pile 3, the connecting barrel 31 is inserted into the top end of the precast pile 1, the top end of the precast pile 1 is provided with the connecting groove 15, the connecting groove 15 can be inserted into the connecting barrel 31, and the connecting barrel 31 is inserted into the connecting groove 15.

[0052] When the precast pile 1 is pressed, the connecting pile 3 can be used to connect the top end of the precast pile 1, when connecting, the connecting barrel 31 can be inserted into the connecting groove 15, and then the precast pile 1 and the connecting pile 3 can be welded, and the connecting barrel 31 can limit the connecting pile 3 and the precast pile 1, so that the connecting pile 3 and the precast pile 1 are not easy to deviate during welding.

[0053] The end of the connecting barrel 31 away from the connecting pile 3 is provided with a clamping sliding block 32, and the groove bottom of the connecting groove 15 is provided with an insertion groove 16, which can be inserted into the clamping sliding block 32. The side wall of the insertion groove 16 is provided with a clamping groove 161, and the shape and size of the clamping groove 161 are matched with the shape and size of the clamping sliding block 32. After the clamping sliding block 32 is inserted into the insertion groove 16, it can be moved into the clamping groove 161.

[0054] When connecting, the connecting barrel 31 is inserted into the connecting groove 15, so that the clamping sliding block 32 is inserted into the insertion groove 16, and then the connecting pile 3 is rotated, so that the clamping sliding block 32 slides into the clamping groove 161, so that the connecting pile 3 and the precast pile 1 are not easy to separate, and the precast pile 1 and the connecting pile 3 are convenient for welding.

[0055] Refer to Figure 1 With Figure 2 , the top of the connecting pile 3 is provided with a top seat 4, the outer side wall of the top seat 4 abuts with the inner side wall of the connecting pile 3, the outer side wall of the top seat 4 is provided with a sliding groove 41, the inner wall of the sliding groove 41 is slidably connected with an inner insertion block 42, the inner insertion block 42 is inserted with the inner side wall of the connecting pile 3, the side of the sliding groove 41 away from the outer side wall of the top seat 4 is provided with an outer top elastic element 43, the outer top elastic element 43 is a spring, and the outer top elastic element 43 is connected with the inner insertion block 42.

[0056] After connecting, the pile pressing can be continued, and the connecting pile 3 is pressed into the soil layer, and the connecting pile 3 presses the precast pile 1 into deeper soil layer. When the precast pile 1 and the connecting pile 3 are pressed to the preset depth, the connecting pile 3 can be cut, and after cutting, the top seat 4 can be placed in the connecting pile 3. After the top seat 4 is moved to the position to be inserted with the connecting pile 3, the outer top elastic element 43 pushes the inner insertion block 42, a part of the inner insertion block 42 is pushed out of the outer side wall of the top seat 4, and the inner insertion block 42 is inserted in the inner side wall of the connecting pile 3. The top seat 4 can be installed on the connecting pile 3. After the top seat 4 is installed, the top of the connecting pile 3 can play a blocking role, reducing the water inflow of the connecting pile 3, and improving the waterproofness of the connecting pile 3.

[0057] The top surface of the top seat 4 is provided with a limiting groove 44, the limiting groove 44 is communicated with the sliding groove 41, the limiting groove 44 is slidably connected with a limiting plate 45, the side wall of the limiting plate 45 is provided with a through hole 451, the size of the through hole 451 is greater than the size of the slot of the sliding groove 41, and the sliding direction of the limiting plate 45 is perpendicular to the top surface of the top seat 4.

[0058] Before the top seat 4 is placed into the connecting pile 3, the inner plug 42 can be pushed into the sliding groove 41, the limiting plate 45 is moved, the through hole 451 is staggered with the sliding groove 41, the inner plug 42 is abutted with the side of the limiting plate 45 away from the outer side wall of the top seat 4 under the pushing force of the outer top elastic piece 43, the top seat 4 is placed into the connecting pile 3 and moved to the position to be fixed, then the limiting plate 45 is moved, the through hole 451 is communicated with the sliding groove 41, at this time the limiting plate 45 no longer blocks the inner plug 42, the inner plug 42 is pushed out and inserted with the inner side wall of the connecting pile 3 under the pushing force of the outer top elastic piece 43, so that the top seat 4 can be fixed on the connecting pile 3.

[0059] The number of the limiting plate 45 is not less than four, and the number of the limiting plate 45 in the embodiment is four, in the state that the sliding groove 41 is staggered with the through hole 451, the upper part of the through hole 451 is located above the top seat 4, when the top seat 4 is placed into the connecting pile 3, the top seat 4 can be placed into the connecting pile 3 by holding or hooking the limiting plate 45 through the through hole 451, the limiting plate 45 can be sequentially loosened and moved, the through hole 451 is communicated with the sliding groove 41, and the inner plug 42 is inserted with the inner side wall of the connecting pile 3.

[0060] The bottom of the limiting groove 44 is provided with an upper top elastic piece 452, the upper top elastic piece 452 is a spring, one end of the upper top elastic piece 452 away from the bottom of the limiting groove 44 is connected with the limiting plate 45, the upper top elastic piece 452 can apply a pushing force to the limiting plate 45, so that the limiting plate 45 is not easy to fall in the state that the through hole 451 is staggered with the sliding groove 41, the limiting plate 45 remains in the state that the through hole 451 is staggered with the sliding groove 41, when the through hole 451 needs to be communicated with the sliding groove 41, the limiting plate 45 needs to be pushed, and the fault tolerance rate during installation of the top seat 4 is improved.

[0061] The inner side wall of the connecting pile 3 is provided with an inner insertion groove 33, the inner insertion groove 33 is arranged along the extension direction of the connecting pile 3, and the top seat 4 can be installed on the inner wall of the connecting pile 3 after the connecting pile 3 is connected at any height.

[0062] The outer wall of the top seat 4 is provided with a leakage prevention ring 46, the leakage prevention ring 46 is a rubber ring, one side of the leakage prevention ring 46 away from the top seat 4 is connected with the inner side wall of the connecting pile 3, and the sealing property between the top seat 4 and the connecting pile 3 is improved, so that the waterproof property of the connecting pile 3 is further improved.

[0063] The embodiment of the application further discloses a PHC prestressed pipe pile head plugging process.

[0064] The PHC prestressed pipe pile head plugging process comprises the following steps.

[0065] Step 1: The construction site is measured and laid out, and the hole position is determined.

[0066] Step 2: Spray polyurethane foaming agent to the inner wall of the precast pile 1 until the internal space of the precast pile 1 is filled, and spray water to the inner wall of the precast pile 1 during the spraying process.

[0067] Step 3: Weld the pile tip to the precast pile 1.

[0068] Step 4: Drill a hole at the hole position.

[0069] Step 5: Press the precast pile 1 into the hole from the hole position.

[0070] Before the precast pile 1 is pressed into the hole, the precast pile 1 is filled with polyurethane foaming agent. The polyurethane foaming agent adheres and expands on the inner wall of the precast pile 1. The polyurethane foaming agent has high expansion and waterproof properties, and the expanded polyurethane foaming agent can block water. After the inner wall of the precast pile 1 is filled with polyurethane foaming agent, an effective whole is formed, making it difficult for water to infiltrate, thereby improving the anti-seepage effect. Compared with traditional construction techniques, the order of construction is changed, the bottom of the precast pile 1 is sealed before pressing, the operation is reduced, and the construction quality is improved. The sealing quality is higher, and the anti-seepage performance is better. The use of polyurethane foaming agent instead of concrete can reduce construction costs, is easy to carry, is more environmentally friendly and practical than traditional sealing construction, has higher sealing quality, and has better anti-seepage performance.

[0071] Step 1a is added between Step 1 and Step 2: cutting the hard paper skin into a shape that meets the temporary sealing of the internal sealing position of the precast pile 1, then placing the cut hard paper skin into the precast pile 1, and fixing the hard paper skin tightly at the sealing position of the precast pile 1.

[0072] When the polyurethane foaming agent is filled to a sufficient amount, the hard paper skin can block the polyurethane foaming agent, thereby controlling the filling height of the polyurethane foaming agent and reducing the leakage of the polyurethane foaming agent from the precast pile 1 caused by excessive spraying of the polyurethane foaming agent.

[0073] Step 2 includes Step 2.1 and Step 2.2. Step 2.1 is to spray polyurethane foaming agent to the inner wall of the precast pile 1 to fill the inner wall of the precast pile 1 into a closed ring or tube shape to form a foaming agent layer 11. Step 2.2 is to spray the polyurethane foaming agent again after the first spraying to fill the precast pile 1 to the brim to form a foaming agent core 12.

[0074] The injection filling of the polyurethane foaming agent is divided into two times, the first injection of the polyurethane foaming agent can form a foaming agent layer 11 on the inner side wall of the precast pile 1, covering the inner side wall of the precast pile 1, and the second injection is performed after the first injection of the polyurethane foaming agent is hardened, which can reduce the gap between the precast pile 1 and the polyurethane foaming agent, and the second injection of the polyurethane foaming agent is hardened, and the polyurethane foaming agent injected twice is bonded and fixed, so that the interior of the precast pile 1 is filled with the polyurethane foaming agent, the polyurethane foaming agent can expand after being injected, so that the precast pile 1, the foaming agent layer 11 and the foaming agent core 12 form an integrated whole, the polyurethane foaming agent has the characteristics of high expansion and waterproof, and can fill the internal space of the precast pile 1 and block water, thereby improving the anti-seepage effect of the precast pile 1.

[0075] The implementation principle of the embodiment of the present application is that when the interior of the precast pile 1 needs to be sealed, the polyurethane foaming agent is used instead of concrete, the polyurethane foaming agent is injected into the inner side wall of the precast pile 1, the polyurethane foaming agent can expand and harden after entering the precast pile 1, and is not easy to segregate, so that the polyurethane foaming agent forms a foaming agent layer 11 and a foaming agent core 12 in the interior of the precast pile 1, and forms an integrated whole with the precast pile 1, which is sealed and fixed, has a good water blocking effect, and thereby improves the anti-seepage effect of the precast pile 1.

[0076] The above are preferred embodiments of the present application, and the embodiments are only an explanation of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A PHC prestressed concrete pipe pile head sealing process, characterized in that, Includes the following steps: Step 1: Measure and lay out the construction site to determine the location of the pilot hole; Step 2: Spray polyurethane foam into the inner wall of the precast pile (1) until the internal space of the precast pile (1) is fully filled. Spray or sprinkle water on the inner wall of the precast pile (1) during the spraying process. Step 3: Weld the pile tip to the precast pile (1) for fixation; Step 4: Drill holes at the pilot hole locations; Step 5: Drive the precast pile (1) into the hole from the pilot hole position; The precast pile (1) is provided with a foaming agent layer (11) and a foaming agent core (12) inside. The foaming agent layer (11) is attached to the inner side wall of the precast pile (1). The foaming agent layer (11) is located between the foaming agent core (12) and the precast pile (1). The foaming agent core (12) is attached to the side wall of the foaming agent layer (11). The bottom end of the precast pile (1) is provided with a pile tip. The top of the precast pile (1) is provided with a connecting pile (3), and the end of the connecting pile (3) is provided with a connecting cylinder (31). The axis of the connecting cylinder (31) coincides with the axis of the connecting pile (3), and the connecting cylinder (31) is inserted into the top of the precast pile (1). The top of the connecting pile (3) is provided with a top support (4), the outer wall of the top support (4) abuts against the inner side wall of the connecting pile (3), the outer wall of the top support (4) is provided with a sliding groove (41), an inner insert (42) is slidably connected in the sliding groove (41), the inner insert (42) is inserted into the inner side wall of the connecting pile (3), the side wall of the sliding groove (41) is provided with an outer top elastic element (43), the outer top elastic element (43) is connected to the inner insert (42), the top surface of the top support (4) is provided with a limiting groove (44), the limiting groove (44) is connected to the sliding groove (41), the limiting plate (45) is slidably connected in the limiting groove (44), the side wall of the limiting plate (45) is provided with a through hole (451), the size of the through hole (451) is larger than the size of the groove opening of the sliding groove (41); The bottom of the limiting groove (44) is provided with an upper elastic member (452), which is connected to the limiting plate (45). The inner sidewall of the connecting pile (3) is provided with an inner slot (33) for the inner insert block (42) to be inserted along the extension direction of the connecting pile (3). Before placing the top connector (4) into the connecting pile (3), first push the inner insert (42) into the sliding groove (41), move the limiting plate (45) so that the through hole (451) and the sliding groove (41) are offset from each other. After placing the top connector (4) into the connecting pile 3 and moving it to the position that needs to be fixed, move the limiting plate (45) so that the through hole (451) and the sliding groove (41) are connected. At this time, the limiting plate (45) no longer blocks the inner insert (42). The inner insert (42) is pushed out under the thrust of the outer top elastic element (43) and is inserted into the inner wall of the connecting pile (3). The number of limiting plates (45) is not less than four. When the sliding groove (41) and the through hole (451) are staggered, the upper part of the through hole (451) is located above the top seat (4). When the top seat (4) is placed into the connecting pile (3), the top seat (4) is placed into the connecting pile (3) by holding or hooking the limiting plate (45) through the through hole (451). The limiting plates (45) are released and moved in sequence so that the through hole (451) is connected to the sliding groove (41) and the inner insert (42) is inserted into the inner wall of the connecting pile (3).

2. The PHC prestressed pipe pile head sealing process according to claim 1, characterized in that, Step 1a is added between step 1 and step 2: cut the hard cardboard, cut the hard cardboard into a shape that meets the requirements of temporarily sealing the bottom position inside the precast pile (1), and then put the cut hard cardboard into the inside of the precast pile (1) and fix the hard cardboard firmly in the bottom position of the precast pile (1).

3. The PHC prestressed pipe pile head sealing process according to claim 1, characterized in that, Step 2 includes steps 2.1 and 2.

2. Step 2.1 is: spraying polyurethane foaming agent onto the inner wall of the precast pile (1) to fill the inner wall of the precast pile (1) into a closed ring or tube shape, forming a foaming agent layer (11); Step 2.2 is: after the first sprayed polyurethane foaming agent hardens, a second spray is performed to fill the interior of the precast pile (1) to full, forming a foaming agent core (12).

4. The PHC prestressed pipe pile head sealing process according to claim 1, characterized in that, The bottom end of the precast pile (1) is provided with a welded column (13). The pile tip includes a baffle (21) and a pile tip plate (22). The welded column (13) and the baffle (21) are interlocked. The baffle (21) abuts against the bottom end of the precast pile (1). The baffle (21) is fixed to the precast pile (1). The pile tip plate (22) is fixed on the baffle (21). The inner side wall of the precast pile (1) is provided with a sealing plate (14). The foaming agent layer (11) and the foaming agent core (12) are both located between the sealing plate (14) and the baffle (21).

5. The PHC prestressed pipe pile head sealing process according to claim 1, characterized in that, A locking slider (32) is provided at the end of the connecting cylinder (31) away from the connecting pile (3). A connecting groove (15) for the connecting cylinder (31) to be inserted is provided at the top of the precast pile (1). An insertion groove (16) for the locking slider (32) to be inserted is provided at the bottom of the connecting groove (15). A locking groove (161) is provided on the side wall of the insertion groove (16). The shape and size of the locking groove (161) are adapted to the shape and size of the locking slider (32).

6. The PHC prestressed pipe pile head sealing process according to claim 1, characterized in that, The outer wall of the top connector (4) is provided with a leak-proof ring (46), and the side wall of the leak-proof ring (46) is connected to the inner side wall of the connecting pile (3).

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