Pile side grouting system of implantable post-grouting pile

Abstract

The utility model discloses a pile side grouting system of an implantable post-grouting pile, which comprises a plurality of longitudinal grouting guide pipes, a plurality of circles of grouting annular pipes and a plurality of fabric bags, the upper end of each longitudinal grouting guide pipe is connected with a grouting device through a valve, the lower end of each longitudinal grouting guide pipe is connected with a circle of grouting annular pipe in a sealed mode, each circle of grouting annular pipe is arranged on the outer side of a pile body of the prefabricated pipe pile in a sleeving mode, and a plurality of grouting outlets are formed in the circumferential direction of each circle of grouting annular pipe at intervals. A circle of grouting annular pipe is arranged in an annular cavity defined by the inner surface of each fabric bag and the outer surface of the pile body of the prefabricated pipe pile. The grouting system is easy to construct, low in cost and environmentally friendly, post-grouting is implemented in the fabric bag on the pile side, the pile-soil contact area can be increased, the side friction resistance of a pile foundation and the bearing capacity of the pile foundation can be improved, the mud cake effect on the pile side is solved, the exertion coefficient of side resistance is improved, the pulling resistance of the pile foundation is improved, and overall settlement of the pile foundation is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of pile foundation construction, and in particular relates to a pile side grouting system for an implantable post-grouting pile. Background Art

[0002] The most commonly used pile foundation types in coastal areas are bored cast-in-place piles and precast piles. Bored cast-in-place piles require slurry discharge, posing environmental challenges. Conventional precast pile construction techniques generate significant vibration and noise, limiting their use in specialized locations. Embedded piles, a new precast pile construction technology developed in recent years, effectively address vibration and noise issues while minimizing slurry discharge, resulting in green and low-carbon development. Embedded pile technology involves pre-drilling a hole, injecting cement slurry with a specific water-cement ratio into the hole to create a cement-soil structure. High-strength prestressed concrete pipe piles are then embedded using the pile's own weight. Embedded piles address the excessive soil compaction problem associated with traditional precast pile construction, making them a green and environmentally friendly new type of pile foundation. However, in coastal soft soil areas with high organic matter or high water content, the cement-soil structure of static drilled rooted piles can harden slowly or poorly, compromising the bearing capacity of the pile foundation. Therefore, some researchers have proposed adding drainage channels to the cement-soil structure to create embedded drainage piles, thereby improving the bearing capacity of the pile foundation.

[0003] Post-grouting technology for pile foundation usually refers to the process of using a high-pressure grouting pump to press cement slurry of a certain pressure into the soil layer on the side or end of the pile through a pre-buried grouting channel after the bored pile is formed. The soil layer on the side or end of the pile is reinforced through the effects of slurry infiltration, filling, compaction, and consolidation, thereby improving the bearing capacity of the pile foundation.

[0004] In recent years, some experts have tried to use post-grouting technology based on implanted piles. However, the existing post-grouting system for implanted piles is not perfect. After the slurry enters the cement soil, it will diffuse and distribute unevenly, and will not be closely integrated with the pile body. In addition, the compaction effect on the soil is not good, and it may even cause the quality of the cement soil itself to decline, with limited improvement in bearing capacity. In addition, directly extending the grouting pipe into the cement soil may cause blockage, affecting the slurry output rate and pressure, and thus affecting the post-grouting effect. Based on the above problems, the utility model proposes a pile side grouting system for implanted post-grouting piles, which solves the above problems by optimizing the combination of the grouting system and the implanted piles. Utility Model Content

[0005] The purpose of the utility model is to provide a pile side grouting system for implantable post-grouting piles. The grouting system has simple construction, low cost, and is green and environmentally friendly. The post-grouting is implemented in a fabric bag on the side of the pile, which can increase the pile-soil contact area, improve the side friction resistance and pile foundation bearing capacity of the pile foundation, solve the mud skin effect on the pile side, increase the utilization coefficient of the side resistance, and enhance the pull-out resistance of the pile foundation, thereby reducing the overall settlement of the pile foundation.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a pile side grouting system for implanted post-grouting piles, comprising a plurality of longitudinal grouting conduits, a plurality of grouting annular tubes and a plurality of fabric bags, wherein the plurality of longitudinal grouting conduits are fixed to the outside of the pile body of the prefabricated pipe pile to be grouted after the pile is planted by binding belts, each of the longitudinal grouting conduits is arranged along the length direction of the prefabricated pipe pile, the upper end of each longitudinal grouting conduit is connected to the grouting device through a valve, the grouting device is used to inject grouting material into each longitudinal grouting conduit, the lower end of each longitudinal grouting conduit is sealed with a circle of the grouting annular tube, and each circle of the grouting annular tube is sleeved on the pile body of the prefabricated pipe pile. The outer side of the body, each circle of the grouting annular tube is provided with a plurality of grouting outlets at circumferential intervals, the plurality of fabric bags are respectively sleeved on the outer side of the pile body of the prefabricated pipe pile at upper and lower intervals, the upper end and the lower end of each of the fabric bags are respectively fixed to the outer side of the pile body of the prefabricated pipe pile by binding belts and are respectively fixed for a second time by waterproof tapes, the inner surface of each of the fabric bags and the outer surface of the pile body of the prefabricated pipe pile form an annular cavity, and a circle of the grouting annular tube is arranged in each of the annular cavities. When grouting the pile side, the grouting material is poured into the corresponding annular cavity through the multiple grouting outlets on each circle of the grouting annular tube, thereby forming a plurality of enlarged bulbs on the outer side of the prefabricated pipe pile.

[0007] The utility model relates to a grouting system that fixes a longitudinal grouting conduit, a grouting annular tube, a fabric bag and a prefabricated pipe pile as a whole. During pile construction, the prefabricated pipe pile is implanted into a drilled hole together with the longitudinal grouting conduit, the grouting annular tube and the fabric bag. After the cement slurry on the pile side of the prefabricated pipe pile is initially solidified, the valve is first opened, and a water pressure test is performed on the grouting system using a grouting device to dredge the grouting system. After the grouting system is dredged, the valve is closed, and then post-grouting operation under high pressure can be performed. During post-grouting, the valve is opened, and the grouting material is poured into the corresponding annular cavity through a plurality of grouting outlets on each circle of the grouting annular tube, thereby forming a plurality of expanded bulbs on the outside of the prefabricated pipe pile. After all the cement slurry, grouting material and the like are fully solidified, the prefabricated pipe pile, the grouting material injected around the pile and the fabric bag are solidified to form a whole and bear the load together.

[0008] After the post-grouting operation, the grouting material injected into the annular cavity inside the fabric bag will tightly wrap the prefabricated pipe pile, so that the pile end of the implanted pile and the pile side part within a certain range above the pile end form a strong nodule, thereby effectively improving the bearing capacity of the pile foundation of the implanted pile. The fabric bag can prevent the slurry from spreading everywhere. The enlarged bulb can increase the pile-soil contact area, play the role of a cement reinforcement layer, and the increased cement soil solidification area around the pile can increase the lateral friction resistance of the pile foundation, solidify the mud skin on the pile side, and solve the mud skin effect on the pile side. At the same time, the enlarged bulb increases the squeezing effect on the surrounding soil, which will evenly compact and reinforce the soil around the pile, further improve the coefficient of lateral resistance, enhance the pull-out resistance of the pile foundation, and reduce the overall settlement of the pile foundation. In addition, the use of the utility model grouting system for post-grouting can also reduce the pile diameter and pile length of the pile foundation under the condition of the same bearing capacity value, thereby saving construction costs and achieving better economy.

[0009] Preferably, the grouting device includes an air compressor, an air outlet pipe, a grouting pump, a mixing barrel and a slurry outlet pipe. The air outlet of the air compressor is connected to the air inlet of the grouting pump via the air outlet pipe. The grouting material is contained in the mixing barrel. The slurry inlet of the grouting pump is communicated with the inner cavity of the mixing barrel. The slurry outlet of the grouting pump is connected to the slurry outlet pipe. The slurry outlet pipe is used to connect to the upper end of any one of the longitudinal grouting conduits.

[0010] Preferably, the multiple grouting outlets are of different sizes to avoid the occurrence of a situation where all the grouting outlets are blocked.

[0011] Preferably, the prefabricated pipe pile is a bamboo pile or a static drilled root pile. Further, the pile end of the prefabricated pipe pile is provided with an enlarged end or directly uses an enlarged head pile to increase the pile end resistance.

[0012] Preferably, the prefabricated pipe piles are formed by connecting multiple prefabricated pipe pile segments, and the connection position of two prefabricated pipe pile segments is located inside one of the annular cavities, so that the gap at the connection between the two prefabricated pipe pile segments can be squeezed by pressure grouting, so that the two prefabricated pipe pile segments become a whole.

[0013] Preferably, the grouting material is cement soil discharged during on-site construction. This not only reuses on-site materials, reducing costs, but also reduces the total amount of mud discharged during construction, thereby minimizing environmental pollution.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1) The grouting system of the present invention is simple to construct, low in cost, and green and environmentally friendly, and can realize efficient and reliable post-grouting on the pile side of prefabricated pipe piles. After the post-grouting operation, the grouting material injected into the annular cavity inside the fabric bag will tightly wrap the prefabricated pipe pile, forming an expanded bulb on the outside of the prefabricated pipe pile. The expanded bulb can increase the pile-soil contact area, play the role of a cement reinforcement layer, and the cement soil solidification area around the pile is increased, which can improve the side friction resistance and pile foundation bearing capacity of the pile foundation, solidify the mud skin on the pile side, and solve the mud skin effect on the pile side. At the same time, the expanded bulb increases the squeezing effect of the surrounding soil, which will evenly compact and reinforce the soil around the pile, further improve the utilization coefficient of the side resistance, enhance the pull-out resistance of the pile foundation, and reduce the overall settlement of the pile foundation;

[0016] 2) The use of the grouting system of the present invention for post-grouting can also reduce the pile diameter and pile length under the condition of the same bearing capacity, thereby saving construction costs and achieving better economic efficiency;

[0017] 3) The grouting system of the utility model innovatively utilizes the advantages of implanted piles without affecting the quality of the piles, that is, the holes are drilled first and then the piles are planted, the pile sinking resistance is small, the longitudinal grouting conduit, the grouting annular tube, the fabric bag and the like are implanted smoothly and conveniently, and the post-grouting is implemented in the fabric bag on the side of the pile, the slurry diffusion effect is relatively ideal, is not affected by the surrounding cement soil, and is more closely integrated with the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the effect after the installation of the pile side grouting system and the construction of the implanted piles in the embodiment;

[0019] Figure 2 Schematic diagram of the relative positions of the longitudinal grouting conduit and the grouting annular pipe in the embodiment after installation and the prefabricated pipe piles in the cross section;

[0020] The specific reference numerals in the figures are as follows:

[0021] 1-longitudinal grouting conduit, 2-grouting annular pipe, 21-grouting outlet, 3-fabric bag, 31-waterproof tape, 4-prefabricated pipe pile, 41-cement slurry on the side of prefabricated pipe pile, 5-expanded bulb, 61-air compressor, 62-air outlet pipe, 63-grouting pump, 64-mixing barrel, 65-slurry outlet pipe. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0023] The pile side grouting system of the implanted post-grouting pile of the embodiment is as follows: Figure 1 and Figure 2As shown, it includes two longitudinal grouting pipes 1, two circles of grouting annular pipes 2 and two fabric bags 3. The two longitudinal grouting pipes 1 are fixed to the outside of the pile body of the prefabricated pipe pile 4 to be grouted after the pile is planted by binding belts. Each longitudinal grouting pipe 1 is arranged along the length direction of the prefabricated pipe pile 4. The upper end of each longitudinal grouting pipe 1 is connected to the grouting device through a valve. The valve and the grouting device are both arranged on the ground. The grouting device is used to inject grouting material into each longitudinal grouting pipe 1. The lower end of each longitudinal grouting pipe 1 is sealed with a circle of grouting annular pipe 2. Each circle of grouting annular pipe 2 is sleeved on the outside of the pile body of the prefabricated pipe pile 4. Each circle of grouting annular pipe 2 is circumferentially spaced apart with a plurality of grouting outlets 21 of different sizes. The two fabric bags 3 are sleeved on the outside of the pile body of the prefabricated pipe pile 4 at intervals up and down (for the convenience of the view, Figure 1 The cement slurry 41 on the pile side of the prefabricated pipe pile 4 was longitudinally sectioned and the woven bag 3 at the lower position was removed. The upper and lower ends of each fabric bag 3 were respectively fixed to the outside of the pile body of the prefabricated pipe pile 4 by binding belts and were secondarily fixed by waterproof tape 31. The inner surface of each fabric bag 3 and the outer surface of the pile body of the prefabricated pipe pile 4 formed an annular cavity. A circle of grouting annular tubes 2 was arranged in each annular cavity. When grouting the pile side, the grouting material was poured into the corresponding annular cavity through the multiple grouting outlets 21 on each circle of grouting annular tubes 2, thereby forming two enlarged bulbs 5 on the outside of the prefabricated pipe pile 4.

[0024] In this embodiment, the grouting device includes an air compressor 61, an air outlet pipe 62, a grouting pump 63, a mixing barrel 64 and a slurry outlet pipe 65. The air outlet of the air compressor 61 is connected to the air inlet of the grouting pump 63 through the air outlet pipe 62. The mixing barrel 64 is filled with grouting material, which is cement soil discharged during the on-site construction process. The slurry inlet of the grouting pump 63 is connected to the inner cavity of the mixing barrel 64. The slurry outlet of the grouting pump 63 is connected to the slurry outlet pipe 65, and the slurry outlet pipe 65 is used to connect to the upper end of any longitudinal grouting conduit 1.

[0025] In this embodiment, the prefabricated pipe pile 4 is a bamboo-jointed pile to enhance the engagement between the pile and the grouting material and the surrounding cement soil. The pile end can be provided with an enlarged end or directly use an enlarged head pile. When the prefabricated pipe pile 4 is formed by connecting multiple prefabricated pipe pile segments, the connection point between two prefabricated pipe pile segments is preferably located inside an annular cavity.

[0026] In this embodiment, when the soil layer around the binding position of the fabric bag 3 is silt, sand, etc., the compaction effect is obvious, it is easier to form a complete enlarged bulb 5, and the lateral friction resistance is significantly improved.

[0027] The construction process of implanting piles: first, use a single-axis drilling rig to drill holes according to the set depth; then plant the piles, inject a certain amount of cement slurry into the drilled hole according to the proportion, and lift the drill while grouting; after the drilling is completed, a hole containing cement soil is formed, and the prepared prefabricated pipe pile 4 is implanted into the drilled hole together with the longitudinal grouting guide tube 1, the grouting annular tube 2, and the fabric bag 3. After the cement slurry 41 on the pile side of the prefabricated pipe pile 4 is initially solidified, the valve is opened first, and the grouting system is subjected to a water pressure test using the grouting device to clear the grouting system. After the grouting system is cleared, the valve is closed, and then the post-grouting operation under high pressure can be carried out. During the post-grouting, the valve is opened, and the grouting material is poured into the corresponding annular cavity through the multiple grouting outlets 21 on each circle of the grouting annular tube 2, thereby forming two enlarged bulbs 5 on the outside of the prefabricated pipe pile 4. After all the cement slurry 41, grouting materials, etc. are completely solidified, the prefabricated pipe pile 4 and the grouting material injected around the pile and the fabric bag 3 are solidified to form a whole and bear the load together.

[0028] The aforementioned side-grouting system innovatively leverages the advantages of planted piles without compromising pile quality. This system involves drilling the hole before planting the pile, resulting in low pile sinking resistance. The longitudinal grouting conduit 1, grouting annular tube 2, and fabric bag 3 are all installed smoothly and conveniently. Post-grouting is performed in the fabric bag 3 on the side of the pile, resulting in ideal slurry diffusion, unaffected by the surrounding cement and soil, and a tighter bond with the pile body. The aforementioned side-grouting system leverages the advantages of planted piles, both in terms of their green, low-carbon nature and stable pile quality. Furthermore, post-grouting enhances pile-cement-soil interaction, improving the pile foundation's bearing capacity and deformation resistance.

Claims

1. A pile side grouting system for an implantable post-grouting pile, characterized in that: The utility model comprises a plurality of longitudinal grouting conduits, a plurality of grouting annular pipes and a plurality of fabric bags. The plurality of longitudinal grouting conduits are fixed to the outside of the pile body of the prefabricated pipe pile to be grouted after the pile is planted by binding belts. Each of the longitudinal grouting conduits is arranged along the length direction of the prefabricated pipe pile. The upper end of each longitudinal grouting conduit is connected to the grouting device through a valve. The grouting device is used to inject grouting material into each longitudinal grouting conduit. The lower end of each longitudinal grouting conduit is sealed with a circle of grouting annular pipes. Each circle of grouting annular pipes is sleeved on the outside of the pile body of the prefabricated pipe pile. The circumferential spacing of each circle of grouting annular pipes is 1 / 4. A plurality of grouting outlets are provided, and the plurality of fabric bags are respectively sleeved on the outside of the pile body of the prefabricated pipe pile at intervals in the upper and lower directions. The upper end and the lower end of each fabric bag are respectively fixed to the outside of the pile body of the prefabricated pipe pile by binding belts and are respectively fixed for a second time by waterproof tapes. The inner surface of each fabric bag and the outer surface of the pile body of the prefabricated pipe pile form an annular cavity. A circle of the grouting annular tube is arranged in each annular cavity. When grouting the pile side, the grouting material is poured into the corresponding annular cavity through the plurality of grouting outlets on each circle of the grouting annular tube, thereby forming a plurality of enlarged bulbs on the outside of the prefabricated pipe pile.

2. The pile side grouting system of the implantable post-grouting pile according to claim 1, characterized in that: The grouting device includes an air compressor, an air outlet pipe, a grouting pump, a mixing barrel and a slurry outlet pipe. The air outlet of the air compressor is connected to the air inlet of the grouting pump via the air outlet pipe. The grouting material is contained in the mixing barrel. The slurry inlet of the grouting pump is communicated with the inner cavity of the mixing barrel. The slurry outlet of the grouting pump is connected to the slurry outlet pipe. The slurry outlet pipe is used to connect the upper end of any one of the longitudinal grouting conduits.

3. The pile side grouting system of the implantable post-grouting pile according to claim 1, characterized in that: The multiple grouting outlets are of different sizes.

4. The pile side grouting system of the implantable post-grouting pile according to claim 1, characterized in that: The prefabricated pipe piles are bamboo piles or static drilled root piles.

5. The pile side grouting system of the implantable post-grouting pile according to claim 4, characterized in that: The pile end of the prefabricated pipe pile is provided with an enlarged end or an enlarged head pile is directly used.

6. The pile side grouting system of the implantable post-grouting pile according to claim 1, characterized in that: The prefabricated pipe pile is formed by connecting a plurality of prefabricated pipe pile segments, and the connection position of two prefabricated pipe pile segments is located inside one of the annular cavities.

7. The pile side grouting system of the implantable post-grouting pile according to claim 1, characterized in that: The grouting material is cement soil discharged during the on-site construction process.

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