A carbon-negative pipe pile based on high-strength grouting material and a construction method thereof

Abstract

The present application relates to a kind of negative carbon pipe piles based on high-strength grouting material, including high-strength grouting material matched with prefabricated pipe pile (1), circulating grouting device (9) and joint device (8), prefabricated pipe pile (1) is equipped with matched grouting pipe (2), grout hole (4), pile side grouting device (5), pile side protective reinforcement (6) and optical fiber temperature sensor (7);Two prefabricated pipe piles (1) adjacent are connected by joint device (8), the middle part of combined prefabricated pipe pile (1) and the middle part of joint flange (81) are through, and through hole (11) is matched with circulating grouting device (9), circulating grouting device (9) includes matched grouting core tube (91), high-pressure rubber capsule bag (92), grout plug (94), water pipe (95) and water inlet (96).The present application has the advantages of improving the durability of pipe pile under high-frequency vibration, so that it has the effect of negative carbon shock absorption.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, and in particular to a negative carbon precast pile based on a new high-strength grouting material and its construction and testing methods. Background Technology

[0002] Pile foundation engineering is a crucial part of the construction industry, directly determining the quality of the project. Precast piles, characterized by high strength, convenient and quick construction, and high single-pile bearing capacity, are a common type of pile foundation in structures. However, the production process of precast pipe piles generates a large amount of carbon dioxide, which is detrimental to carbon neutrality. Patent CN11465214A discloses a method for preparing carbon-negative concrete precast piles, which exhibit excellent mechanical properties and durability.

[0003] With the continuous development of high-speed railways, the high-frequency vibrations caused by superload and natural environmental factors pose a significant challenge to the strength of piles. Large excitation forces or impacts can easily cause pile tilting or even breakage. To further improve pile performance, post-grouting technology has been widely used in pile foundation engineering. Post-grouting technology injects grout around the pile to improve the mechanical properties of the surrounding soil, thereby increasing the bearing capacity of the pile foundation. During pile foundation construction, soft soil foundations requiring drainage are frequently encountered, especially saline-alkali soils in coastal areas. These soils have high water content and are highly corrosive. If large amounts of water are not drained during construction, they will react chemically with the soil, increasing carbon dioxide emissions, increasing construction difficulty, and affecting the quality of the pipe piles. For example, patent CN112627162A discloses a drainage composite pile based on geopolymer grouting, which combines composite pile technology with geopolymer materials to achieve the dual functions of foundation reinforcement and drainage.

[0004] However, in recent years, the use of large direct piles has become more and more widespread, with lengths often exceeding 30m. Therefore, pile splicing is required. Since pipe piles are often connected by mechanical connection and manual welding, coupled with the corrosive effect of saline-alkali soil, it is difficult to guarantee the construction quality and the strength of the pipe pile connection. Secondly, the existing grouting technology has failed to ensure that the injected grout fully covers the pile body and has failed to achieve the purpose of negative carbon effect and energy dissipation and vibration reduction at the same time. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of low strength at the joint of existing precast pipe piles, high difficulty in grouting, and poor pile performance. It provides a negative carbon pipe pile based on high-strength grouting material, which improves the durability of the pipe pile under high-frequency vibration and gives it the effect of negative carbon vibration reduction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A negative carbon pipe pile based on high-strength grouting material includes high-strength grouting material that is used in conjunction with precast pipe piles, a circulating grouting device, and a joint device.

[0008] The precast pipe pile is equipped with a grouting pipe, which is evenly distributed along the inner wall of the pile side. The pile side is provided with grout outlet holes, which are also evenly distributed vertically along the pile body. The opening position of the grouting pipe corresponds to the grout outlet hole. A matching pile side grouting device is connected to the grout outlet hole. The pile side grouting device is provided with pile side protective steel bars. A set of fiber optic temperature sensors is connected to the pile side. The fiber optic temperature sensors are located on the pile side near the grout outlet hole to detect the solidification of the grout based on the temperature change of the soil on the pile side.

[0009] Two adjacent precast pipe piles are connected by a joint device, which is a joint flange with matching openings and flange grout outlets. The openings correspond to the grouting pipes and are located on the same axis. The flange grout outlets are evenly distributed around the joint flange, and each flange grout outlet is connected to a flange grouting device.

[0010] The assembled precast pipe pile is connected to the middle of the joint flange, and the through hole is matched with the circulating grouting device. The circulating grouting device includes a grouting core tube, which extends into the through hole and is connected to a pair of high-pressure rubber bags at its bottom. The high-pressure rubber bags are arranged vertically along the axis of the through hole and there is a gap between the two high-pressure rubber bags. The gap is matched with the grout outlet. A grout stop plug is connected to the bottom of the high-pressure rubber bags and a water pipe is connected to the top. The water pipe extends upward along the through hole and has a water inlet at its upper end to ensure that the grout is evenly distributed on the side of the pile.

[0011] Furthermore, the precast pipe piles include embedded precast pipe piles and driven precast pipe piles. The embedded precast pipe piles have four grouting pipes evenly arranged along the inner wall of the pile side, and each grouting pipe is fixed to the inner wall of the pile side by angle steel. The driven precast pipe piles have grouting pipes reserved inside the pile body, with four grouting pipes evenly reserved according to the pile body.

[0012] Furthermore, the grout outlet holes are set in four groups, and at least four grouting pipes are provided on the same cross section of the pile body. The four groups of grout outlet holes are evenly distributed around the pile body, and each group of grout outlet holes is evenly arranged vertically every 1 to 2 meters along the pile body. The number of holes is set according to the specific pile length.

[0013] Furthermore, the grouting pipe is equipped with an intelligent distributor, which is monitored by a pressure sensor and a flow meter and connected to a computer. The grouting volume and grouting pressure of the grouting pipe are controlled by the background system to ensure that the amount of cement in the grout and the grouting pressure are constant, and that the amount of grout discharged from each grouting pipe is consistent, so that each grouting hole in the same cross section has the same effect.

[0014] Furthermore, the high-strength grouting material is composed of modified epoxy resin, polyether polyol, polyisocyanate and catalyst in a certain proportion. The additives per 100 grams of base material are 75g to 90g of polyether polyol, 10g to 20g of modified epoxy resin and 80.3g to 88.45g of polyisocyanate. Among them, the modified epoxy resin uses 10g of epoxy resin and 13.27g of 3-aminopropyltriethoxysilane as raw materials.

[0015] To further achieve the objectives of this invention, a construction method for negative carbon pipe piles based on high-strength grouting materials is also provided, the specific steps of which are as follows:

[0016] (1) Setting out and positioning: The pile driver is positioned, and according to the diameter and length of the precast pipe pile, the drilling rig is used to drill the pile hole to the preset depth in the soft stratum;

[0017] (2) Grouting pipe installation: If pre-embedded precast pipe piles are used, the grouting pipes are fixed to the inner wall of the pile side with angle steel, and four pipes are evenly arranged on the side wall to ensure uniform grouting at the same cross section. When connecting the pipes, they can be connected by flanges. If driven precast pipe piles are used, the grouting pipes are pre-reserved inside the pile body, and four pipes are evenly arranged to ensure that the opening position of the grouting pipe corresponds to the grout outlet hole. After the grouting pipes are connected, the pile is driven.

[0018] (3) Using the pile driver pulley to lift the pile: When the bottom of the pile is 30-50cm above the ground, move or adjust the pile driver to align the pipe pile with the pile position and then drive the pile. The pile cap, pile body and the center line of the pile driving should coincide. The pipe pile is connected by flange connection. First, use bolts to fix it and then weld it. The weld should be full, continuous and the root must be fully welded.

[0019] (4) Start the grouting system and grout the pile side through the grouting pipe. The grout containing high-strength grouting material is injected into the soil on the pile side through the pre-set grout outlet hole on the pile side.

[0020] (5) After the grouting is completed, remove the grouting core tube, start the air injection device, inject carbon dioxide gas into the grouting tube, and control the pressure at 3-9 MPa. The gas will be pumped into the pipeline through the air pump and into the soil on the pile side through the pre-set holes on the pile side, squeezing the grout in the cross section, allowing it to penetrate radially along the cross section, accelerating the solidification reaction of the grout, and finally forming a bamboo-shaped solidified body on the pile side. At the same time, the solidification effect of carbon dioxide injection and grout is detected in real time by the fiber optic temperature sensor to explore the diffusion law of the solidified grout.

[0021] (6) If grouting returns during the grouting process, stop grouting immediately and use intermittent grouting, that is, pressurize every 15 minutes and resume grouting after one hour until the grouting conditions are met. After grouting is completed, remove excess gravel, sand and grout from the top of the pile and its vicinity to complete the construction of one pile.

[0022] Furthermore, in step (2), if driven precast pipe piles are used, the grouting pipe reserved on the inner wall of the pile side should correspond to the opening of the joint flange. When the precast pipe piles are connected, the grout outlet of the flange on the side of the joint flange should be vertically aligned with the grout outlet of the pile side. At this time, the grouting pipe and the joint device form a whole, and the grouting core pipe can pass through the middle of the joint device to facilitate its up and down movement for grouting operations.

[0023] Furthermore, in step (2), the joint flange is connected to the precast pipe pile by bolts, and then further sealed by spot welding. Finally, cement grout is injected through a preset flange grouting device to further form a layer of stone body with a thickness of not less than 5cm at the joint, thereby improving the durability of the precast pipe pile.

[0024] Further, in step (4), before grouting, the grouting core tube is placed in the precast pipe pile at the designed grouting position. A water pump is used to pump water from the inlet into the upper and lower high-pressure rubber bags. The high-pressure rubber bags expand and create a sealed space gap in the pile body within a certain range of the grout outlet. At this time, the grout is injected into the grouting core tube. The grout enters the sealed space inside the pile through the grout outlet between the two rubber bags. Finally, it is injected into the soil on the pile side by the pile side grouting device. When grouting at one elevation is completed, the grouting pipe is closed first, and then the water pump is closed. After the high-pressure rubber bags shrink, the grouting core tube is moved to the next designed grouting position. The above operation is repeated to achieve full-section grouting on the pile side.

[0025] Furthermore, in step (5), the fiber optic temperature sensor is fixed to the side of the pile before pile driving and connected to the data collection system. It is fixed in multiple layers using cementitious material to ensure that it is not easily damaged or detached during pile driving. The fiber optic cable is connected by heat fusion.

[0026] Compared with the prior art, the advantages of the technical solution of the present invention are as follows:

[0027] (1) Compared with traditional precast pipe piles, the grout outlet hole on the side of the pile of the present invention can be used as both an air injection hole and a drainage hole. After the grouting is completed, carbon dioxide gas can be injected to reinforce the grout. At the same time, during construction, the pore water in the soil can be effectively removed to achieve drainage and reinforcement. This accelerates the dissipation of excess pore water pressure generated by the soft clay around the pile under the action of squeezing and disturbance, thereby effectively reducing the harm of the soil squeezing effect to the project and forming a three-purpose hole.

[0028] (2) Compared with conventional grouting materials, the high-strength new grouting of the present invention avoids the disadvantages of long curing time and difficulty in quality assurance of traditional cement-soil materials. The new high-strength material has a maximum strength of up to 80MPa, extremely low initial grout viscosity, high toughness and good thermal stability, effectively improving the strength of the pile foundation and greatly improving the bearing capacity of the foundation.

[0029] (3) The present invention adopts a circulating grouting method, which uses grout outlet holes evenly arranged on the pile side to achieve full-section grouting on the pile side, ensuring that the amount of cement in the grout and the grouting pressure are constant, so that each grout outlet hole in the same section has the same effect, ensuring that the grout distribution on the pile side is uniform, realizing the grout covering the entire pile body, forming an effective pile-grout-soil structure layer, thereby realizing effective bonding and load transfer between the pipe pile and the soil, and further improving the strength of the pile body;

[0030] (4) In this invention, carbon dioxide gas is injected after grouting to compact the grout on the side section of the permeable pile. The injected carbon dioxide reacts with the grouting material to form a high-strength elastic solidified soil, which ultimately forms a bamboo-shaped reinforced body. At the same time, the solidification effect of the grout is detected in real time using an optical fiber temperature sensor. During earthquakes or high-frequency vibrations, the bamboo-shaped reinforced body can weaken the impact of radial impact force on the superstructure and has a good energy dissipation and vibration reduction effect.

[0031] (5) Compared with traditional connection joints, the modified flange joint is equipped with a grout outlet and a grouting device, so that the grouting area is around the pipe pile connection, which can strengthen the connection area and form a triple reinforcement of bolts, welding and grout, which greatly improves the bending stiffness and bending bearing capacity of the connection structure, and improves the connection strength of the pipe pile. At the same time, the high-strength new grouting has high durability and corrosion resistance, which can prevent the connection device from being damaged by corrosion for a long time.

[0032] (6) The high-strength new grouting of the present invention greatly improves the strength of the large-diameter negative carbon precast pipe pile. When designing the pipe pile, the pile length can be optimized, the pile diameter can be reduced, the amount of concrete material can be reduced, the cost can be reduced and the carbon dioxide emission can be reduced. At the same time, carbon dioxide gas can be effectively used to strengthen the pile body strength, achieve the negative carbon effect, and is green and low carbon, which is forward-looking. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the pre-embedded precast pipe pile structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the driven precast pipe pile structure of the present invention;

[0035] Figure 3 This is a structural diagram of the connector flange of the present invention;

[0036] Figure 4 This is a cross-sectional view of the connector flange of the present invention;

[0037] Figure 5 This is a diagram showing the layout of the grouting pipes for the pre-embedded precast pipe piles of the present invention.

[0038] Figure 6 This is a cross-sectional view of one side wall of the driven precast pipe pile of the present invention;

[0039] Figure 7This is an overall structural diagram of the precast pipe pile grouting device of the present invention;

[0040] Figure 8 This is a diagram illustrating the effect of carbon dioxide injection in this invention;

[0041] Figure 9 This is a final effect diagram of the reinforcement effect of the present invention;

[0042] Figure 10 This is a partially enlarged view of the reinforcement effect of the present invention. Detailed Implementation Example 1

[0043] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a negative carbon pipe pile based on high-strength grouting material and its construction method. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0044] See Figure 1 , Figure 2 , Figure 3 and Figure 6 A carbon negative pipe pile based on high-strength grouting material, comprising high-strength grouting material for use with precast pipe pile 1, a circulating grouting device 9, and a joint device 8, characterized in that:

[0045] See Figure 1 , Figure 2 and Figure 5 The precast pipe pile 1 is provided with four grouting pipes 2. The grouting pipes 2 are evenly distributed on the inner wall of the pile side along the pile body. The precast pipe pile 1 includes a pre-embedded precast pipe pile 1a and a driven precast pipe pile 1b. The grouting pipes 2 of the pre-embedded precast pipe pile 1a are evenly arranged along the inner wall of the pile side. Each grouting pipe 2 is fixed to the inner wall of the pile side by an angle steel 10. The grouting pipes 2 of the driven precast pipe pile 1b are reserved inside the pile body. Four grouting pipes 2 are evenly reserved along the pile body.

[0046] The grouting pipe 2 is equipped with an intelligent distributor 12. The intelligent distributor 12 is a pressure sensor and flow meter that are monitored and connected to a computer. The back-end controls the grouting volume and grouting pressure of the grouting pipe to ensure that the amount of cement in the grout and the grouting pressure are constant, and that the amount of grout coming out of each grouting pipe is consistent, so that each grouting hole in the same cross section has the same effect.

[0047] The pile side 3 is provided with grout outlet holes 4, which are also evenly distributed vertically along the pile body. There are four groups of grout outlet holes 4, which are evenly distributed around the pile body. Each group of grout outlet holes 4 is evenly arranged vertically every 1 to 2 meters along the pile body. The number of holes is set according to the specific pile length.

[0048] The opening position on the grouting pipe 2 corresponds to the grout outlet hole 4. The grout outlet hole 4 is connected to a matching pile side grouting device 5, and a set of fiber optic temperature sensors 7 are connected to the pile side 3. The fiber optic temperature sensors 7 are located on the pile side 3 near the grout outlet hole 4 to detect the solidification of the grout based on the temperature change of the soil on the pile side.

[0049] See Figure 1 , Figure 3 and Figure 4 Two adjacent precast pipe piles 1 are connected by a joint device 8. The joint device 8 is a joint flange 81, which is provided with a matching opening 81a and a flange grout outlet 81b. The opening 81a corresponds to the grouting pipe 2 and the two are located on the same axis. The flange grout outlets 81b are evenly distributed around the joint flange 81, and each flange grout outlet 81b is connected to a flange grouting device 82.

[0050] See Figure 6 and Figure 7 The precast pipe pile 1 after assembly is connected to the middle of the joint flange 81, and the through hole 11 is matched with the circulating grouting device 9. The circulating grouting device 9 includes a grouting core tube 91, which extends into the through hole 11 and is connected to a pair of high-pressure rubber bags 92 at its bottom. The high-pressure rubber bags 92 are arranged vertically along the axis of the through hole 11 and a gap 93 is provided between the two high-pressure rubber bags 92. The gap 93 is matched with the grout outlet 4. A grout stop plug 94 is connected to the lower part of the high-pressure rubber bags 92 and a water pipe 95 is connected to the upper part. The water pipe 95 extends upward along the through hole 11 and is provided with a water inlet 96 at its upper end to make the grouting slurry on the pile side evenly distributed.

[0051] In this embodiment, the high-strength grouting material is composed of modified epoxy resin, polyether polyol, polyisocyanate and catalyst in a certain proportion. The additives per 100 grams of base material are 75g to 90g of polyether polyol, 10g to 20g of modified epoxy resin and 80.3g to 88.45g of polyisocyanate. The modified epoxy resin uses 10g of epoxy resin and 13.27g of 3-aminopropyltriethoxysilane as raw materials.

[0052] like Figure 6As shown, before grouting, the grouting core tube 91 is placed inside the grouting pipe 2 at the designed grouting position. A water pump is used to pump water through the water pipe 95 into the two high-pressure rubber bags 92 via the inlet 96. The bags expand, creating a sealed space within a certain range of the pile body at the grout outlet 4. At this point, grout is injected into the grouting core tube 91. The grout enters the sealed space inside the pile through the outlet between the two high-pressure rubber bags 92, and finally is injected into the soil along the pile side by the pile side grouting device 5. After grouting at one elevation is completed, the grouting core tube 91 is closed first, then the water pump is turned off. After the rubber bags shrink, the grouting core tube 91 is moved to the next designed grouting position. Repeating the above operation achieves full-section grouting of the pile side. At the start of grouting, the grout is mixed with the soil around the pile. The cement grout is injected into the voids of the granular soil, gradually replacing and expelling the air and water, binding the soil particles together, and enhancing the soil's strength and impermeability. Under the grouting pressure, the cement grout seeps back down along the pile body, further enveloping and covering the pile body, fully filling the weak mud cake layer between the pile body and the soil layer, and further enhancing the pile body's frictional resistance. Example 2

[0053] In the construction process of applying this invention, if pre-embedded precast pipe piles 1a are used, such as Figure 1 As shown, the grouting pipe 2 is then connected using angle steel 10 as follows: Figure 5 As shown, four pipes are fixed to the inner wall of the pipe pile and evenly arranged along the side wall to ensure uniform grouting at the same cross section. Short pipes should be used for pipe pile connection. When installing grouting pipe 2, the position of the grout outlet should correspond to the position of the grout outlet 4 of the pipe pile and the flange grout outlet 81b of the joint flange 8.

[0054] If driven precast pipe piles 1b are used, such as Figure 2 As shown, grouting pipes 2 are pre-installed on the inner wall of the precast pipe pile, with four pipes evenly arranged along the side wall. The position of the grouting pipes 2 pre-installed on the side wall of the pipe pile should correspond to the opening 81a on the upper part of the joint flange 81. The diameter of the through hole 11 is greater than 28mm, allowing the circulating grouting core pipe to pass through. See [reference needed]. Figure 7 Simultaneously, pile-side grouting devices 5 are installed at the designed grout outlet locations, and pile-side protective steel bars 6 are used to protect the pile-side grouting devices 5. During the splicing of pipe piles, the grouting devices and fiber optic temperature sensors 7 should be protected to prevent them from falling off during transportation and pile driving. During grouting construction, grouting core tubes 91 of the circulating grouting device 9 are simply inserted into the reserved grouting pipes for grouting. During grouting operations, grout is injected into the soil along the pile side through the grout outlet 4, and a small amount of grout is also injected into the interior of the pile side, forming a grout-enriched body on the inner wall of the pile, further increasing the pile side friction resistance.

[0055] When connecting two types of pipe piles, the position of the flange outlet 81b of the joint flange 81 should be vertically aligned with the position of the grout outlet 4 of the pipe pile. At this time, the grouting pipe 2 and the joint device 8 form a whole. The grouting core pipe 91 can pass through the joint device 8, which is convenient for it to move up and down to carry out grouting operations. Finally, it is injected into the soil on the side of the pile by the pile side grouting device 5. Example 3

[0056] During the construction process of applying this invention, such as Figure 1 As shown, the fiber optic temperature sensor 7 is fixed to the pile side 3 with adhesive and connected to the back-end equipment; a heat fusion method can be used for connection. After grouting is completed, the grouting pipe is cleaned with water. See also... Figure 8 Subsequently, carbon dioxide gas 13 is injected using an air pump, with the pressure controlled at 3-9 MPa. That is, carbon dioxide is injected into the soil side of the pile through the vent hole under high pressure. The high-pressure carbon dioxide gas has a dissolving effect, which enhances the mass transfer of the grouting material, promotes the solidification reaction of the material, and causes the grout to be squeezed and penetrated into the soil cross section through the vent hole. Finally, a bamboo-shaped solidified body is formed on the pile side, which has a diameter expansion effect and improves the strength of the soil side of the pile.

[0057] Simultaneously, a fiber optic temperature sensor 7 is used to detect the solidification effect of the carbon dioxide-reinforced grout. This technology can detect the grout diffusion range and infer the solidification status of the grout through temperature. If the detection effect is unsatisfactory, grout can be replenished using a circulating grouting device to ensure that the grout evenly covers the entire pile body, thereby effectively resisting dynamic loads such as impact forces or vibration forces under high load levels. Due to the high strength characteristics of the grouting material, after the injection of carbon dioxide, a high-strength elastic reinforced body is formed, such as... Figure 9 As shown, it can weaken the radial excitation force or impact force brought about by high-frequency vibration, so that the pile is in the elastic deformation stage when subjected to excitation force within a certain range, such as... Figure 10 As shown, the area covered by grout is less affected by vibration loads and has higher seismic resistance and better damping effect.

[0058] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A negative carbon pipe pile based on high-strength grouting material, comprising high-strength grouting material for use with precast pipe piles (1), a circulating grouting device (9), and a joint device (8), characterized in that: The precast pipe pile (1) is provided with a grouting pipe (2), which is evenly distributed along the pile body on the pile side. The pile side (3) is provided with a grout outlet hole (4), which is evenly distributed vertically along the pile body. The opening position on the grouting pipe (2) corresponds to the grout outlet hole (4). The grout outlet hole (4) is connected to a matching pile side grouting device (5). The pile side grouting device (5) is provided with a pile side protective steel bar (6). A set of fiber optic temperature sensors (7) is connected to the pile side (3). The fiber optic temperature sensors (7) are located on the pile side (3) near the grout outlet hole (4). Two adjacent precast pipe piles (1) are connected by a joint device (8). The joint device (8) is a joint flange (81), which is provided with a matching opening (81a) and a flange grout outlet (81b). The opening (81a) corresponds to the grouting pipe (2) and the two are located on the same axis. The flange grout outlets (81b) are evenly distributed around the joint flange (81), and each flange grout outlet (81b) is connected to a flange grouting device (82). The precast pipe pile (1) after assembly is connected to the middle of the joint flange (81), and the through hole (11) is matched with the circulating grouting device (9). The circulating grouting device (9) includes a grouting core pipe (91). The grouting core pipe (91) extends into the through hole (11) and its bottom is connected to a pair of high-pressure rubber bags (92). The high-pressure rubber bags (92) are arranged up and down along the axis of the through hole (11) and there is a gap (93) between the two high-pressure rubber bags (92). The gap (93) is matched with the grout outlet (4). The bottom of the high-pressure rubber bag (92) is connected to a grout stop plug (94) and the top is connected to a water pipe (95). The water pipe (95) extends upward along the through hole (11) and its upper end is provided with a water inlet (96).

2. The negative carbon pipe pile based on high-strength grouting material according to claim 1, characterized in that: The precast pipe pile (1) includes embedded precast pipe pile (1a) and driven precast pipe pile (1b). The grouting pipe of the embedded precast pipe pile (1a) is evenly arranged along the inner wall of the pile side. Each grouting pipe (2) is fixed to the inner wall of the pile side by angle steel (10). The grouting pipe of the driven precast pipe pile (1b) is reserved inside the pile body. Four grouting pipes (2) are evenly reserved according to the pile body.

3. The negative carbon pipe pile based on high-strength grouting material according to claim 1, characterized in that: The grout outlet holes (4) are set in four groups. At least four grouting pipes (2) are provided on the same cross section of the pile body. The four groups of grout outlet holes (4) are evenly distributed around the pile body, and each group of grout outlet holes (4) is evenly arranged vertically every 1 to 2 m along the pile body. The number of holes is set according to the specific pile length.

4. The negative carbon pipe pile based on high-strength grouting material according to claim 1 or 2, characterized in that: The grouting pipe (2) is equipped with an intelligent distributor (12). The intelligent distributor (12) is a pressure sensor and flow meter that are monitored and connected to a computer. The grouting volume and grouting pressure of the grouting pipe are controlled by the background system.

5. The negative carbon pipe pile based on high-strength grouting material according to claim 1 or 2, characterized in that: The high-strength grouting material is composed of modified epoxy resin, polyether polyol, polyisocyanate and catalyst in a certain proportion. The additives per 100 grams of base material are 75g to 90g of polyether polyol, 10g to 20g of modified epoxy resin and 80.3g to 88.45g of polyisocyanate. The modified epoxy resin uses 10g of epoxy resin and 13.27g of 3-aminopropyltriethoxysilane as raw materials.

6. A construction method for negative carbon pipe piles based on high-strength grouting material as described in claim 1, comprising the following specific steps, characterized in that: Step 1, laying out and positioning: The pile driver is positioned, and according to the pile diameter and pile length of the precast pipe pile (1), a drilling rig is used to drill pile holes in the soft strata to the preset depth; Step 2, Grouting pipe installation: If pre-embedded precast pipe piles (1a) are used, the grouting pipes (2) are fixed to the inner wall of the pile side using angle steel (10), and four pipes are evenly arranged on the side wall to ensure uniform grouting at the same cross section. When connecting the pipes, they are connected through the joint flange (81). If driven precast pipe piles (1b) are used, the grouting pipes (2) are pre-reserved inside the pile body, and four pipes are evenly arranged to ensure that the opening position of the grouting pipe corresponds to the grout outlet. After the grouting pipes are connected, the pile is driven. Step 3: Use the pile driver pulley to lift the pile: When the bottom of the pile is 30-50cm above the ground, move or adjust the pile driver to align the pipe pile with the pile position and then drive the pile. The pile cap, pile body and the center line of the pile driving should be coincident. The pipe pile is connected by flange connection. First, fix it with bolts and then weld it. The weld should be full, continuous and the root must be fully welded. Step 4: Start the grouting system and grout the pile side (3) through the grouting pipe (2). The grout containing high-strength grouting material is injected into the soil on the pile side through the pre-set grout outlet hole (4) on the pile side. Step 5: After grouting is completed, remove the grouting core tube (91), start the air injection device, inject carbon dioxide gas (13) into the grouting pipe (2), and control the pressure at 3-9 MPa. The gas will be pumped into the pipeline through the air pump and into the soil on the pile side through the pre-set holes on the pile side, squeezing the grout in the cross section, allowing it to penetrate radially along the cross section, accelerating the solidification reaction of the grout, and finally forming a bamboo-shaped solidified body (14) on the pile side. At the same time, the solidification effect of carbon dioxide injection and grout is detected in real time by the fiber optic temperature sensor (7) to explore the diffusion law of the solidified grout. Step 6: If grout returns during the grouting process, stop grouting immediately and use intermittent grouting, that is, apply instantaneous pressure every 15 minutes and resume grouting after one hour until the grouting termination conditions are met. After grouting is completed, remove excess gravel, sand and grout from the top of the pile and its vicinity, thus completing the construction of one pile.

7. The construction method for negative carbon pipe piles based on high-strength grouting material according to claim 6, characterized in that: In step two, if a driven precast pipe pile (1b) is used, the grouting pipe (2) reserved on the inner wall of the pile side should correspond to the opening (81a) of the joint flange (81). When the precast pipe pile (1) is connected, the flange grout outlet (81b) on the side of the joint flange (81) should be vertically aligned with the grout outlet (4) on the pile side (3). At this time, the grouting pipe (2) and the joint device (8) form a whole. The grouting core pipe (91) passes through the middle of the joint device (8) to facilitate its up and down movement for grouting operations.

8. The construction method for negative carbon pipe piles based on high-strength grouting material according to claim 7, characterized in that: In step two, the joint flange (81) is connected to the precast pipe pile (1) by bolts, and then further sealed by spot welding. Finally, cement grout is injected through the preset flange grouting device (82) to further form a stone body with a thickness of not less than 5cm at the joint.

9. The construction method for negative carbon pipe piles based on high-strength grouting materials according to any one of claims 6 to 8, characterized in that: In step four, before grouting, the grouting core tube (91) is placed in the precast pipe pile (1) at the designed grouting position. A water pump is used to pump water from the inlet (96) into the upper and lower high-pressure rubber bags (92) through the water pipe (95). The high-pressure rubber bags (92) expand and form a sealed space gap in the pile body within a certain range of the grout outlet. At this time, the grout is injected into the grouting core tube (91). The grout enters the sealed space inside the pile through the grout outlet (4) between the two high-pressure rubber bags (92). Finally, it is injected into the soil on the pile side by the pile side grouting device (5). When grouting at one elevation is completed, the grouting core tube (91) is closed first, and then the water pump is turned off. After the high-pressure rubber bags (92) shrink, the grouting core tube (91) is moved to the next designed grouting position. The above operation is repeated to achieve full-section grouting on the pile side.

10. The construction method for negative carbon pipe piles based on high-strength grouting materials according to any one of claims 6 to 8, characterized in that: In step five, the fiber optic temperature sensor (7) is fixed to the side of the pile (3) before the pile is driven and connected to the data collection system. It is fixed in multiple layers with cementitious material to ensure that it is not easily damaged or detached during pile driving. The fiber optic is connected by heat fusion.

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