CN111074883A - Post-grouting permeable concrete pipe pile and construction method thereof - Google Patents
Post-grouting permeable concrete pipe pile and construction method thereof Download PDFInfo
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- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
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Abstract
The invention relates to the technical field of geotechnical engineering and discloses a post-grouting pervious concrete pipe pile and a construction method thereof. The post-grouting permeable concrete pipe pile comprises a prefabricated permeable concrete pipe pile, a slurry consolidation layer fixedly connected in an inner hole of the prefabricated permeable concrete pipe pile and a soil consolidation layer arranged on the periphery of the prefabricated permeable concrete pipe pile. The construction method comprises the following steps: 1) drilling by a drilling machine to obtain a pile hole; 2) implanting a prefabricated water-permeable tubular pile into the pile hole; 3) inserting a grouting pipe into the prefabricated water-permeable tubular pile, and performing low-pressure grouting on the inner hole of the prefabricated water-permeable tubular pile through the grouting pipe to fill the inner hole of the prefabricated water-permeable tubular pile with slurry; 4) and (3) closing the hole opening of the inner hole of the prefabricated water-permeable tubular pile, performing high-pressure grouting through the grouting pipe, allowing partial grout to permeate from the pipe wall of the prefabricated water-permeable tubular pile to the outer side of the tubular pile, allowing the partial grout to enter a gap between the prefabricated water-permeable tubular pile and the pile hole and soil around the pile hole, and allowing partial grout to stay in the inner hole of the prefabricated water-permeable tubular pile. The post-grouting permeable concrete pipe pile is high in strength and strong in bearing capacity of a single pile.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a post-grouting pervious concrete pipe pile and a construction method thereof.
Background
The foundation treatment technology is widely used in foundation reinforcement of buildings, roads, railways, hydraulic engineering and other fields, and is an important component of the building engineering technology. Two most widely used technologies in the foundation treatment technology are drainage consolidation technology and composite foundation technology. The drainage consolidation technology is characterized in that a drainage channel is provided for soil consolidation through pre-driving plastic drainage plates, sand piles and the like, and the soil consolidation is accelerated under the action of surcharge or vacuum preloading, so that the consolidation effect of improving the mechanical property of foundation soil is achieved. The composite foundation technology is that part of soil body is reinforced or replaced in foundation soil to form vertical reinforcement (pile body) to bear upper load together with the surrounding soil body. The vertical reinforcement (pile) engineering application can be generally divided into discrete piles (such as compacted gravel piles, vibration compacted sand piles and the like), flexible piles (such as cement mixing piles, jet grouting piles and the like) and rigid piles (such as plain concrete piles, reinforced concrete piles and the like).
In pile foundation engineering, the bearing capacity and the uplift resistance of a pile body are improved by adopting a method of grouting after filling the pile, but the hole forming of the pile in a soft soil area is difficult, and hole collapse and pile body extrusion are easy to occur, so that the pile forming is difficult or local defects are caused. Ordinary precast tubular pile can solve above-mentioned problem well, but often has the not enough problem of bearing capacity. The general grouting precast pile is difficult to achieve a good grouting effect, such as uneven slurry distribution, insufficient diffusion radius, insufficient strength of a grouting solidification body, serious foundation uplift, serious pile position deviation and the like, and meanwhile, the underground water level of the bottom of a foundation pit in a soft soil area is high, the bearing capacity is poor, the mechanical construction is inconvenient, and the construction difficulty of the post-grouting precast pile is further increased.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention aims to provide a post-grouting pervious concrete pipe pile and a construction method thereof.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the rear grouting permeable concrete pipe pile comprises a prefabricated permeable concrete pipe pile with a hollow structure, a slurry consolidation layer fixedly connected in an inner hole of the prefabricated permeable concrete pipe pile and a soil consolidation layer arranged on the periphery of the prefabricated permeable concrete pipe pile.
According to the post-grouting permeable concrete pipe pile, preferably, a gravel consolidation layer is further arranged between the prefabricated permeable concrete pipe pile and the soil consolidation layer, the prefabricated permeable concrete pipe pile is fixedly connected with the gravel consolidation layer, and the gravel consolidation layer is fixedly connected with the soil consolidation layer.
According to the post-grouting permeable concrete tubular pile, preferably, the prefabricated permeable tubular pile is a hollow circular ring-shaped cross-section pile made of permeable concrete, the outer diameter of the prefabricated permeable tubular pile is 400 mm-800 mm, and the wall thickness is 80 mm-150 mm.
According to the post-grouting permeable concrete pipe pile, the concrete strength grade of the prefabricated permeable concrete pipe pile is preferably C15C 30.
The construction method of the post-grouting permeable concrete pipe pile comprises the following steps:
(1) forming a hole at the pile position by using a drilling machine to obtain a pile hole, wherein the depth of the pile hole is the same as the designed pile bottom elevation;
(2) implanting a prefabricated water-permeable tubular pile into the pile hole, wherein the prefabricated water-permeable tubular pile is of a hollow structure;
(3) inserting a grouting pipe into the inner hole of the prefabricated water-permeable tubular pile to the bottom of the tubular pile, and then performing low-pressure grouting on the inner hole of the prefabricated water-permeable tubular pile through the grouting pipe to fill the inner hole of the prefabricated water-permeable tubular pile with grout, wherein part of the grout permeates into the outer side of the tubular pile from the pile bottom of the prefabricated water-permeable tubular pile;
(4) and (3) closing the hole opening of the inner hole of the prefabricated water-permeable tubular pile, performing high-pressure grouting through a grouting pipe, allowing part of grout to permeate from the pipe wall of the prefabricated water-permeable tubular pile to the outer side of the tubular pile, allowing the part of grout to enter a gap between the prefabricated water-permeable tubular pile and the pile hole and a soil body around the pile hole, forming a bonding layer at the periphery of the prefabricated water-permeable tubular pile, and allowing part of grout to remain in the inner hole of the prefabricated water-permeable tubular.
According to the construction method, the prefabricated water-permeable tubular pile is preferably a hollow circular ring-shaped cross-section pile made of water-permeable concrete.
According to the construction method, preferably, the prefabricated water-permeable tubular pile has an outer diameter of 400 mm-800 mm and a wall thickness of 80 mm-150 mm.
According to the construction method, the concrete strength grade of the prefabricated permeable tubular pile is preferably C15-C30.
According to the construction method, the pressure of the low-pressure grouting in the step (3) is preferably 0.1-0.5 MPa.
According to the construction method, the pressure of the high-pressure grouting in the step (4) is preferably 1.5-3.0 MPa.
According to the construction method, preferably, the aperture of the pile hole is smaller than or equal to the outer diameter of the prefabricated water-permeable tubular pile, and the prefabricated water-permeable tubular pile is implanted into the pile hole by adopting a static pressure or vibration method in the step (2).
According to the construction method, preferably, when the diameter of the pile hole is larger than the outer diameter of the prefabricated water-permeable tubular pile, after the prefabricated water-permeable tubular pile is implanted in the step (2), graded broken stones are filled in the gap between the outer wall of the prefabricated water-permeable tubular pile and the wall of the pile hole, so that the gap between the outer wall of the prefabricated water-permeable tubular pile and the wall of the pile hole is filled with the graded broken stones. More preferably, the particle size of rubble is no longer than the interval between prefabricated permeable tubular pile outer wall and the stake hole pore wall.
According to the construction method, preferably, when the diameter of the pile hole is larger than the outer diameter of the prefabricated water-permeable tubular pile, the prefabricated water-permeable tubular pile is positioned in the center of the pile hole when the prefabricated water-permeable tubular pile is implanted into the pile hole.
Compared with the prior art, the invention has the following positive beneficial effects:
(1) the prefabricated water-permeable tubular pile is a hollow circular-ring-shaped cross-section pile made of water-permeable concrete, the pipe wall of the whole prefabricated water-permeable tubular pile has excellent permeability, water, slurry, cement mortar and the like can permeate through the pipe wall of the prefabricated water-permeable tubular pile, and the permeation is uniform; when the pile body is positioned in a weak water permeability soil layer, the prefabricated water permeable tubular pile is implanted into a pile hole, graded broken stones are filled between the prefabricated water permeable tubular pile and the pile hole (when the diameter of the pile hole is smaller than or equal to the outer diameter of the prefabricated water permeable tubular pile, the prefabricated water permeable tubular pile and the graded broken stones filled around the prefabricated water permeable tubular pile can be used as a vertical drainage body, water in a soil body around the tubular pile can enter the prefabricated tubular pile through the pipe wall of the prefabricated water permeable tubular pile to permeate downwards, the soil body is quickly drained and solidified, the strength of the soil body is increased, and therefore the reinforcing effect of improving the mechanical property of foundation soil is achieved.
(2) The wall thickness of the prefabricated water-permeable tubular pile is set to be 80-150 mm, the wall thickness is thin, the water-permeable path is short, water, slurry, cement paste and the like can smoothly penetrate through the wall of the prefabricated water-permeable tubular pile, and the water permeability can be guaranteed.
(3) The pipe wall of the prefabricated water-permeable pipe pile has excellent permeability and can be used as a rear grouting pipe, slurry injected into an inner hole of the prefabricated water-permeable pipe pile at high pressure can uniformly seep out of the pipe wall, and partial slurry permeates into a gravel layer (without the gravel layer when the diameter of the pile hole is smaller than or equal to the outer diameter of the prefabricated water-permeable pipe pile) and a soil body around the prefabricated water-permeable pipe pile from the pipe wall of the prefabricated water-permeable pipe pile, so that a gravel bonding layer and a soil body bonding layer are formed around the prefabricated water-permeable pipe pile, and the reinforcing effect on the gravel and the soil body around the prefabricated pipe pile; meanwhile, part of slurry can stay in the prefabricated water-permeable tubular pile and is solidified in the prefabricated water-permeable tubular pile to form a solidified body, so that the prefabricated water-permeable tubular pile, the solidified body inside the prefabricated water-permeable tubular pile, the broken stone solidified layer outside the prefabricated water-permeable tubular pile and the soil body solidified layer jointly form a vertical composite reinforcement of a foundation, namely the post-grouting water-permeable concrete tubular pile, the bearing capacity of a single pile is greatly improved, and the bearing capacity of the single pile is improved by 1.3-1.8 times according to the difference of soil bodies at the pile end and the pile side.
(4) The grouting pipe (steel pipe) of the first grouting in the invention can be repeatedly used for grouting without being pulled out, and the grouting quality can be better ensured.
(5) The construction method of the post-grouting permeable concrete pipe pile has strong soil adaptability, can be used for almost all soil layers such as soft soil, silt, sandy soil, silty clay and the like, is particularly suitable for a soft soil layer with higher water content at the upper part of the pile body and a strong-permeability soil layer at the lower part, and can be used as a vertical drainage body to quickly drain and consolidate the soft soil layer; meanwhile, the strength of the prepared post-grouting permeable concrete pipe pile can be conveniently adjusted by adjusting the strength of grouting liquid, and the technology is flexible.
(6) The invention adopts the pile bottom post-grouting technology to have compaction and consolidation effects, eliminates two defects of pile body mud skin and pile bottom sediment (waste soil) and the like inherent in the cast-in-place pile, can fundamentally solve the technical problems that the pile body mud skin and the pile bottom sediment affect the cast-in-place pile concrete pouring quality and reduce the pile end bearing capacity, effectively makes up the defects of the cast-in-place pile, improves the single-pile bearing capacity, reduces the sedimentation of a pile foundation and ensures the pile foundation engineering quality to have important significance; the method can be widely used for foundation reinforcement of buildings, highways, railways, water conservancy and other projects.
(7) The post-grouting pervious concrete tubular pile prepared by the invention can also be used as an uplift pile, when the post-grouting pervious concrete tubular pile is used as the uplift pile, an uplift tie bar is arranged in the tubular pile and is connected with a building foundation, and the pile integrally bears vertical uplift force.
Drawings
Fig. 1 is one of the structural schematic diagrams of a post-grouting permeable concrete pipe pile prepared in embodiment 1 of the present invention;
fig. 2 is a second schematic structural view of a post-grouting permeable concrete pipe pile prepared in example 1 of the present invention;
fig. 3 is a schematic view of a construction process of a post-grouting permeable concrete pipe pile in embodiment 1 of the present invention;
fig. 4 is one of the structural schematic diagrams of the post-grouting permeable concrete pipe pile prepared in embodiment 2 of the present invention;
fig. 5 is a second schematic structural view of a post-grouting permeable concrete pipe pile prepared in example 2 of the present invention;
fig. 6 is a schematic view of a construction process of a post-grouting permeable concrete pipe pile in embodiment 2 of the present invention.
In the figure, 1 is a prefabricated permeable tubular pile, 2 is a soil body consolidation layer, 3 is a broken stone consolidation layer, 4 is a grouting pipe, 5 is a plugging device, and 6 is a slurry consolidation layer.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are not intended to limit the scope of the present invention.
Example 1:
a post-grouting permeable concrete pipe pile is shown in figures 1 and 2 and comprises a hollow annular prefabricated permeable pipe pile 1, a slurry consolidation layer 6 fixedly connected (fixedly connected) in the prefabricated permeable pipe pile 1 and a soil consolidation layer 2 fixedly connected to the periphery of the prefabricated permeable pipe pile 1. The prefabricated water-permeable tubular pile 1 is made of water-permeable concrete, the outer diameter of the prefabricated water-permeable tubular pile 1 is 400-800 mm, the wall thickness is 80-150 mm, and the concrete strength grade of the prefabricated water-permeable tubular pile is C15-C30.
The construction method of the post-grouting permeable concrete pipe pile shown in fig. 3 specifically comprises the following steps:
(1) forming a hole at the pile position by using a drilling machine to obtain a pile hole, wherein the depth of the pile hole is the same as the designed pile bottom elevation;
(2) implanting a prefabricated water-permeable tubular pile 1 into a pile hole by adopting a static pressure or vibration method, wherein the diameter of the pile hole is less than or equal to the outer diameter of the prefabricated water-permeable tubular pile 1, the prefabricated water-permeable tubular pile 1 is a hollow circular cross-section pile made of water-permeable concrete, the outer diameter of the prefabricated water-permeable tubular pile 1 is 400-800 mm, the wall thickness is 80-150 mm, and the concrete strength grade of the prefabricated water-permeable tubular pile 1 is C15-C30;
(3) inserting a grouting pipe 4 into the inner hole of the prefabricated water-permeable tubular pile 1 to the bottom of the tubular pile, and then performing low-pressure grouting on the inner hole of the prefabricated water-permeable tubular pile 1 through the grouting pipe 4, wherein the grouting pressure is 0.2MPa, so that the inner hole of the prefabricated water-permeable tubular pile 1 is filled with grout, and part of the grout permeates into the outer side of the tubular pile from the pile bottom of the prefabricated water-permeable tubular pile 1;
(4) after low-pressure grouting is finished, immediately sealing an opening of an inner hole of the prefabricated water-permeable tubular pile 1 by using a plugging device 5, then performing high-pressure grouting through a grouting pipe 4, wherein the grouting pressure is 2.0MPa, part of grout permeates from the pipe wall of the prefabricated water-permeable tubular pile 1 to the outer side of the tubular pile and enters a gap between the prefabricated water-permeable tubular pile 1 and the pile hole and soil around the pile hole, a soil consolidation layer 2 is formed on the periphery of the prefabricated water-permeable tubular pile 1 after consolidation, part of grout stays in the inner hole of the prefabricated water-permeable tubular pile 1, and a grout consolidation layer 6 is formed after consolidation.
Example 2:
a post-grouting permeable concrete pipe pile is shown in figures 4 and 5 and comprises a hollow annular prefabricated permeable pipe pile 1, a slurry consolidation layer 6 fixedly connected (fixedly connected) in the prefabricated permeable pipe pile, and a gravel consolidation layer 3 and a soil consolidation layer 2 which are fixedly connected to the periphery of the prefabricated permeable pipe pile 1, wherein the prefabricated permeable pipe pile 1 is fixedly connected with the gravel consolidation layer 3, and the gravel consolidation layer 3 is fixedly connected with the soil consolidation layer 2. The prefabricated water-permeable tubular pile 1 is made of water-permeable concrete, the outer diameter of the prefabricated water-permeable tubular pile 1 is 400-800 mm, the wall thickness is 80-150 mm, and the concrete strength grade of the prefabricated water-permeable tubular pile 1 is C15-C30.
The construction method of the post-grouting permeable concrete pipe pile shown in fig. 6 specifically comprises the following steps:
(1) forming a hole at the pile position by using a drilling machine to obtain a pile hole, wherein the depth of the pile hole is the same as the designed pile bottom elevation;
(2) implanting a prefabricated water-permeable tubular pile 1 into a pile hole by adopting a static pressure or vibration method, implanting the prefabricated water-permeable tubular pile 1 into the center of the pile hole when the diameter of the pile hole is larger than the outer diameter of the prefabricated water-permeable tubular pile 1, and filling graded broken stones into a gap between the outer wall of the prefabricated water-permeable tubular pile 1 and the wall of the pile hole so that the graded broken stones are filled into the gap between the outer wall of the prefabricated water-permeable tubular pile 1 and the wall of the pile hole, wherein the particle size of the broken stones is not more than the distance between the outer wall of the prefabricated water-permeable tubular pile and; the prefabricated permeable tubular pile 1 is a hollow circular cross-section pile made of permeable concrete, the outer diameter of the prefabricated permeable tubular pile 1 is 400-800 mm, the wall thickness is 80-150 mm, and the concrete strength grade of the prefabricated permeable tubular pile 1 is C15-C30;
(3) inserting a grouting pipe 4 into the inner hole of the prefabricated water-permeable tubular pile 1 to the bottom of the tubular pile, then performing low-pressure grouting on the inner hole of the prefabricated water-permeable tubular pile 1 through the grouting pipe 4, wherein the grouting pressure is 0.5MPa, so that the inner hole of the prefabricated water-permeable tubular pile 1 is filled with grout, and part of the grout permeates into the outer side of the tubular pile from the pile bottom of the prefabricated water-permeable tubular pile 1;
(4) after low-pressure grouting is finished, immediately sealing an inner hole orifice of the prefabricated water-permeable tubular pile 1 by using a plugging device 5, then performing high-pressure grouting through a grouting pipe 4, wherein the grouting pressure is 3.0MPa, part of slurry permeates from the pipe wall of the prefabricated water-permeable tubular pile 1 to the outer side of the tubular pile, enters graded broken stones between the prefabricated water-permeable tubular pile 1 and the pile hole and soil around the pile hole, and forms a broken stone bonding layer 3 and a soil bonding layer 4 after bonding respectively; and part of the slurry is left in the inner hole of the prefabricated water-permeable tubular pile 1 and forms a slurry consolidation layer 6 after consolidation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, but rather as the following description is intended to cover all modifications, equivalents and improvements falling within the spirit and scope of the present invention.
Claims (10)
1. The rear grouting permeable concrete pipe pile is characterized by comprising a prefabricated permeable pipe pile with a hollow structure, a slurry consolidation layer fixedly connected in the prefabricated permeable pipe pile and a soil consolidation layer arranged on the periphery of the prefabricated permeable pipe pile.
2. The post-grouting permeable concrete pipe pile of claim 1, wherein a gravel bonding layer is further arranged between the prefabricated permeable pipe pile and the soil body bonding layer, the prefabricated permeable pipe pile is fixedly connected with the gravel bonding layer, and the gravel bonding layer is fixedly connected with the soil body bonding layer.
3. The post-grouting permeable concrete tubular pile according to claim 1 or 2, wherein the prefabricated permeable tubular pile is a hollow circular ring-shaped cross-section pile made of permeable concrete, the prefabricated permeable tubular pile has an outer diameter of 400mm to 800mm and a wall thickness of 80mm to 150 mm.
4. The construction method of the post-grouting pervious concrete pipe pile according to claim 1 or 2, characterized by comprising the following steps:
(1) forming a hole at the pile position by using a drilling machine to obtain a pile hole, wherein the depth of the pile hole is the same as the designed pile bottom elevation;
(2) implanting a prefabricated water-permeable tubular pile into the pile hole, wherein the prefabricated water-permeable tubular pile is of a hollow structure;
(3) inserting a grouting pipe into the inner hole of the prefabricated water-permeable tubular pile to the bottom of the tubular pile, and then performing low-pressure grouting on the inner hole of the prefabricated water-permeable tubular pile through the grouting pipe to fill the inner hole of the prefabricated water-permeable tubular pile with grout, wherein part of the grout permeates into the outer side of the tubular pile from the pile bottom of the prefabricated water-permeable tubular pile;
(4) and (3) closing the hole opening of the inner hole of the prefabricated water-permeable tubular pile, performing high-pressure grouting through a grouting pipe, allowing part of grout to permeate from the pipe wall of the prefabricated water-permeable tubular pile to the outer side of the tubular pile, allowing the part of grout to enter a gap between the prefabricated water-permeable tubular pile and the pile hole and a soil body around the pile hole, forming a bonding layer at the periphery of the prefabricated water-permeable tubular pile, and allowing part of grout to remain in the inner hole of the prefabricated water-permeable tubular.
5. The construction method according to claim 4, wherein the prefabricated water-permeable tubular pile is a hollow circular ring-shaped cross-section pile made of water-permeable concrete.
6. The construction method according to claim 5, wherein the prefabricated water-permeable pipe pile has an outer diameter of 400mm to 800mm and a wall thickness of 80mm to 150 mm.
7. The construction method according to claim 4, wherein the pressure of the low-pressure grouting in the step (3) is 0.1-0.5 MPa; and (4) performing high-pressure grouting under the pressure of 1.5-3.0 MPa.
8. The construction method according to claim 4, wherein the diameter of the pile hole is smaller than or equal to the outer diameter of the prefabricated water-permeable tubular pile, and the prefabricated water-permeable tubular pile is planted in the pile hole by static pressure or vibration in the step (2).
9. The construction method according to claim 4, wherein when the diameter of the pile hole is larger than the outer diameter of the prefabricated water-permeable tubular pile, after the prefabricated water-permeable tubular pile is implanted in the step (2), graded broken stones are filled in the gap between the outer wall of the prefabricated water-permeable tubular pile and the wall of the pile hole, so that the graded broken stones are filled in the gap between the outer wall of the prefabricated water-permeable tubular pile and the wall of the pile hole.
10. The construction method according to claim 9, wherein the particle size of the broken stone does not exceed the distance between the outer wall of the precast water-permeable tubular pile and the wall of the pile hole.
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| CN111608171A (en) * | 2020-05-27 | 2020-09-01 | 中国一冶集团有限公司 | Sandbar underground soft base pipe, well precipitation anti-floating pipe pile structure and construction method |
| CN112663631A (en) * | 2020-12-09 | 2021-04-16 | 交通运输部公路科学研究所 | Highway slope anti-sliding assembly type double-row pile forming method |
| CN112663631B (en) * | 2020-12-09 | 2022-04-22 | 交通运输部公路科学研究所 | Highway slope anti-sliding assembly type double-row pile forming method |
| CN113089627A (en) * | 2021-03-10 | 2021-07-09 | 中电建路桥集团有限公司 | Construction method of prestressed pipe pile composite foundation for deep soft soil surcharge preloading |
| CN113152418A (en) * | 2021-03-10 | 2021-07-23 | 中电建路桥集团有限公司 | Preloading tubular pile composite foundation suitable for deep soft soil area |
| CN113123329A (en) * | 2021-05-13 | 2021-07-16 | 黄伟志 | Post-grouting process for implanted tubular pile |
| CN113356195A (en) * | 2021-06-18 | 2021-09-07 | 黄伟志 | Prefabricated prestressed concrete hollow anchor rod and construction method thereof |
| CN114482029A (en) * | 2022-02-14 | 2022-05-13 | 安徽省交通规划设计研究总院股份有限公司 | Hole-expanding implanted slurry rock consolidation root solid-expanding prefabricated pile |
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Application publication date: 20200428 |