CN108532592B - Post grouting pile head and post grouting construction method - Google Patents
Post grouting pile head and post grouting construction method Download PDFInfo
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- CN108532592B CN108532592B CN201810340103.0A CN201810340103A CN108532592B CN 108532592 B CN108532592 B CN 108532592B CN 201810340103 A CN201810340103 A CN 201810340103A CN 108532592 B CN108532592 B CN 108532592B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/72—Pile shoes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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Abstract
The invention discloses a post grouting pile head, which comprises: the upper part of the pile head is connected with a grouting pipe; the lower part of the pile head and the upper part of the pile head form an internal part hollow cavity, and a grouting channel is formed; the torsion device is arranged in the hollow cavity and is used for storing elastic deformation energy; the first concave-convex buckle is arranged on the upper part of the pile head; the second concave-convex buckle is arranged on the lower part of the pile head; the pile head upper part and the pile head lower part are connected with the second concave-convex buckle through the first concave-convex buckle in a clamping way, and the pile head upper part and the pile head lower part can be separated or connected in a clamping way along the axial direction; and when the upper part of the pile head and the lower part of the pile head are separated along the axial direction, the grouting pipe, the internal hollow cavity and the grouting channel are communicated. The invention enables the post grouting process to exert better effect at the pile end, the cement slurry of the post grouting can enter a larger soil range to form a denser post grouting expansion head, and a pile-soil mixture with higher cement slurry proportion is formed, so that the bearing performance of the pile is effectively improved.
Description
Technical Field
The invention relates to the technical field of pile foundation engineering, in particular to a post grouting pile head and a post grouting construction method.
Background
At present, pile foundation engineering is widely used in modern construction, and is convenient to construct and high in bearing capacity. The post grouting technology is used as an effective technology in pile foundation engineering construction, and can play a role in solidifying pile bottom sediment and pile side mud skin in a cast-in-place pile through the effects of permeation consolidation, filling compaction, splitting and the like of slurry, and can also strengthen peripheral soil bodies through an enlarged head consolidation body formed by pile end grouting and pile side grouting in a precast pile, thereby having obvious effects in improving the bearing capacity of the pile, reducing sedimentation and improving construction quality. According to the prior researches, when pile end and pile side grouting is adopted, the improvement range of post grouting on the limit bearing capacity is generally between 30% and 150%, the economic benefit is considerable, the application range is continuously expanded, the effect of the post grouting in an egg gravel layer is better than that of a silt layer and is better than that of a clay layer, and the post grouting has wide application in the aspects of high-rise buildings, large bridges and the like in recent years.
However, for the prefabricated pipe pile, because the static pressure process is adopted in most cases, the soil body below the elevation of the designed pile end is basically undisturbed, and one of the important grouting principles of the grouting technology is to fill the soil body pores, so that the pile end expansion head formed by the prior art and research results has a larger lifting space for the practical effect.
Disclosure of Invention
Aiming at the defects, the invention provides the post grouting pile head with the torsion device and the post grouting construction method realized by the post grouting pile head, so that the post grouting process has better effect at the pile end, and the cement slurry of the post grouting can enter a larger soil range to form a more compact and stable post grouting expansion head, thereby effectively improving the bearing capacity of the pile.
In order to achieve the above purpose, the present invention provides the following technical solutions:
there is provided a post-grouting pile head comprising:
the pile head is arranged at the upper part, and the center of the upper part of the pile head is connected with a grouting pipe;
the pile head lower part and the pile head upper part form an internal hollow cavity, and a grouting channel is formed on the pile head lower part;
the torsion device is arranged in the hollow cavity and used for storing elastic deformation energy, and one end of the torsion device is connected with the lower part of the pile head;
the first concave-convex buckle is arranged on the upper part of the pile head, and the other end of the torsion device is connected with the first concave-convex buckle;
the second concave-convex buckle is arranged on the lower part of the pile head;
the pile head upper part and the pile head lower part are connected through the clamping of the first concave-convex buckle and the second concave-convex buckle to form the internal hollow cavity, and the pile head upper part and the pile head lower part can be separated or clamped and connected along the axial direction;
and when the upper part of the pile head and the lower part of the pile head are axially separated, the grouting pipe, the internal hollow cavity and the grouting channel are communicated.
Preferably, the pile head upper part comprises: the middle part of the connecting plate is provided with a through hole; and one end of the annular extension part is connected to the end face of the connecting plate, which faces the lower part of the pile head, and the other end of the annular extension part extends towards the lower part of the pile head, and one side of the annular extension part, which is close to the internal hollow cavity, is provided with a notch part for accommodating the first concave-convex buckle.
Preferably, the pile head lower part includes: a body portion having a hollow interior; the fixing part is connected to the middle part of the end surface of the main body part, which is close to the upper part of the pile head, so that one end of the torsion device is connected; and a tapered portion connected to an end surface of the main body portion remote from the pile head upper portion;
the second concave-convex buckle is arranged on the end face of the main body part, which is close to the upper part of the pile head, and a clamping groove for accommodating the corresponding annular extension part at the notch part is formed between the second concave-convex buckle and the inner wall surface of the main body part.
Preferably, the height of the first concave-convex buckle is half of the depth of the notch, and the height of the annular extension part is larger than the depth of the notch.
Preferably, the grouting channel penetrates through the clamping groove and the conical part.
Preferably, a plugging plate is arranged on the conical part and is used for sealing a slurry outlet of a slurry injection channel formed on the conical part.
Preferably, the outer wall surface of the conical part is provided with a plurality of arc plates which are uniformly distributed, the opening ends of the arc plates face to the slurry outlet, and the protruding direction of the arc plates on the horizontal plane projection is consistent with the torsion direction when the torsion device releases elastic deformation energy.
Preferably, the opening end of the arc-shaped plate is 60-120 mm away from the pulp outlet.
Preferably, the torsion device is a spiral spring.
On the other hand, the post grouting construction method comprises the following steps:
s1, preparing an upper part of a pile head, a lower part of the pile head, a torsion device, a first concave-convex buckle, a second concave-convex buckle and a grouting pipe, and arranging a grouting channel; checking the performance of the torsion device, screwing the torsion device by using external equipment to store elastic deformation energy, and assembling according to the structural arrangement mode of the rear grouting pile head;
s2, connecting the assembled post grouting pile head with a first section of pipe pile, connecting the first section of grouting pipe with the upper part of the pile head, hoisting the pipe pile and the pile head, and gradually pressing and splicing the pile until the depth is designed;
s3, the grouting pipe is connected with a grouting pump, the grouting pump is started, post grouting is carried out according to the designed grouting pressure and grouting amount, and static load test is carried out after grouting is finished and maintenance is carried out for 25-30 days to check the bearing capacity of the single pile.
Compared with the prior art, the invention has the beneficial effects that: the invention is especially suitable for soft soil areas with low pile end resistance, the elastic deformation of the torsion device can be released through the post grouting process, thereby driving the lower part of the pile head to twist a certain angle, and the soil body is disturbed through the arc-shaped steel plate to be in a looser state and generate more pores, thereby forming a denser and bigger pile end post grouting type enlarged head through post grouting; meanwhile, after the cavity formed by the upper part and the lower part of the pile head and the interior of the pile head are subjected to grouting and solidification, the pile head has good compression performance and stability all the time, and a pile soil mixture with higher cement paste proportion is formed at the pile end, so that the grouting effect is better, and the ultimate bearing capacity of a single pile is higher.
Drawings
FIG. 1 is a cross-sectional view of a post grouting pile head and a pipe pile according to a first embodiment of the present invention;
FIG. 2 is a front view and a half-sectional view of an upper portion of a pile head according to a first embodiment of the present invention;
FIG. 3 is a top view of the lower portion of the pile head according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of the first embodiment of the present invention when the lower part of the pile head moves down after grouting, the buckle is tripped, and grout starts to enter the grouting channel;
FIG. 5 is a rotary cross-sectional view of the lower part of the pile head according to the first embodiment of the present invention;
fig. 6 is a bottom view of a lower portion of a pile head according to a first embodiment of the present invention.
The reference numerals are explained as follows: the grouting pipe comprises a grouting pipe 1, a grouting channel 2, a twisting device 3, a first concave-convex buckle 4, a second concave-convex buckle 4', a connecting plate 5, a through hole 6, a circumferential extension part 7, a notch part 8, a main body part 9, a fixing part 10, a conical part 11, a clamping groove 12, a plugging plate 13, a grouting outlet 14, an arc-shaped plate 15, a pipe pile 16, an internal hollow cavity S, a pile head upper part 100 and a pile head lower part 200.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Embodiment one:
fig. 1 shows a post-grouting pile head according to the invention, which is particularly suitable for soft soil areas with low pile tip resistance, comprising: a pile head upper part 100, wherein a grouting pipe 1 is arranged in the middle of the pile head upper part 100;
a pile head lower part 200, which forms an internal hollow cavity S with the pile head upper part 100, and a grouting channel 2 is arranged on the pile head lower part 200;
a torsion device 3 disposed in the inner hollow cavity S for storing elastic deformation energy, and having one end connected to the pile head lower portion 200; in the embodiment, the torsion device is a spiral spring, and a III-level heat treatment spring steel belt is adopted and consists of carbon tool steels T7-T10 or high-elasticity alloy steel 60Si 2 The spiral spring is made of MnA and other materials, a larger output torque Ts is preferable during material selection, the output torque Ts is determined by soil properties, soil structures and the like, meanwhile, requirements on performances such as rust resistance, tolerance and the like are reduced during material selection of the spiral spring so as to save cost, the longitudinal section of the spiral spring is rectangular, and adjacent rings are non-contact;
a first concave-convex buckle 4 which is arranged on the pile head upper part 100, and the other end of the torsion device 3 is connected with the first concave-convex buckle 4;
a second male and female clasp 4' disposed on the pile head lower portion 200;
the pile head upper part 100 and the pile head lower part 200 are connected through the clamping of the first concave-convex buckle 4 and the second concave-convex buckle 4' to form the internal hollow cavity S, and the pile head upper part 100 and the pile head lower part 200 can be separated or connected in a clamping way along the axial direction; and when the pile head upper part 100 and the pile head lower part 200 are separated by a certain distance along the axial direction, the grouting pipe 1, the internal hollow cavity S and the grouting channel 2 are communicated.
Specifically, as shown in fig. 1 and 2, the pile head upper portion 100 includes: the connecting plate 5 is provided with a through hole 6 at the middle part, and the grouting pipe 1 is communicated with the internal hollow cavity S through the through hole 6; one end of the annular extension part 7 is connected to the end face of the connecting plate 5, which faces the pile head lower part 200, the other end of the annular extension part extends towards the pile head lower part 200, and a notch part 8 for accommodating the first concave-convex buckle 4 is formed on one side, close to the inner hollow cavity S, of the annular extension part 7; .
As shown in fig. 3, 5 and 6, the pile head lower portion 200 includes: a body portion 9 having a hollow interior; a fixing portion 10 connected to the middle portion of the end surface of the main body 9 near the pile head upper portion 100, so that one end of the torsion device 3 is fixedly connected by a hook/clasp/bayonet/welding; and a tapered portion 11 connected to an end surface of the main body portion 9 remote from the pile head upper portion 100; the second concave-convex buckle 4' is connected to the end surface of the main body 9 near the pile head upper portion 100, and a clamping groove 12 for accommodating the corresponding annular extension portion 7 at the notch portion 8 is formed between the second concave-convex buckle and the inner wall surface of the main body 9.
In this embodiment, before the pile head upper portion 100 is engaged with the pile head lower portion 200, the torsion device 3 stores elastic deformation energy by torsion, on this basis, the number of the first concave-convex buckles 4 and the second concave-convex buckles 4 'corresponds to that of the two, for example, the two can be 12 groups, and the two are both in tooth-shaped structures, and the convex parts and the concave parts of the two are engaged with each other to prevent the pile head upper portion 100 and the pile head lower portion 200 from rotating, in this embodiment, the tooth-shaped parts of the first concave-convex buckles 4 and the second concave-convex buckles 4' are all preferably in right trapezoid structures, and two adjacent right trapezoids are in reverse contact through oblique sides; meanwhile, as shown in fig. 4, since both ends of the torsion device 3 are fixed by the fixing portion 10 and the first concave-convex buckle 4, respectively, it can maintain the twisted state (i.e., the direction indicated by the broken line bending arrow in fig. 3) by the engagement limiting action of the first concave-convex buckle 4 and the second concave-convex buckle 4', continuously stores the elastic deformation energy, and the direction of the release trend (i.e., the direction indicated by the solid line bending arrow in fig. 3) when releasing the deformation energy is opposite to the direction of the twisting trend.
Further, as shown in fig. 2, the height (b/2) of the first concave-convex buckle 4 is half the depth (b) of the notch 8, and the height (a) of the annular extension 7 is greater than the depth (b) of the notch 8, so as to prevent the slurry from leaking from the joint of the pile head upper part 100 and the pile head lower part 200 during post grouting.
Thus, as shown in fig. 1 and 4, during post grouting, the inner wall of the inner hollow cavity S is subjected to grouting pressure, so that when the annular extension part 7 of the pile head upper part 100 and the main body part 9 of the pile head lower part 200 are separated from each other in the axial direction and the separation distance (b/2) is equal to the height (b/2) of the first concave-convex buckle 4, the annular extension part 7 of the pile head upper part 100 just escapes from the clamping groove 12, the whole pile head upper part 100 just breaks away from the pile head lower part 200, the grouting pipe 1, the inner hollow cavity S and the grouting channel 2 are communicated, and grouting slurry just can flow into the grouting channel 2 through the grouting pipe 1 and the inner hollow cavity S.
In addition, as shown in fig. 4-6, the grouting channels 2 are disposed through the clamping groove 12 and the taper part 11, and in this embodiment, the grouting channels 2 have 3 channels; preferably, the conical portion 11 is provided with plugging plates 13 corresponding to the grouting channels 2 in number, which are used for closing the grouting outlets 14 of the grouting channels 2 formed on the conical portion 11 and can be propped up under grouting pressure, so that soil impurities are prevented from entering the grouting channels 2 when the pile head is pressed in; in addition, the sum of the cross-sectional areas of all grouting channels 2 is smaller than the cross-sectional area of the grouting pipe 1, thereby ensuring that adequate grouting pressure and flow are provided.
In addition, the outer wall surface of the conical portion 11 is provided with a plurality of arc plates 15 (preferably arc steel plates) which are uniformly distributed (for example, 3), the open end of each arc plate 15 faces the grout outlet 14, the distance between the open end and the grout outlet 14 is 60-120 mm (preferably 100 mm), the protruding direction of each arc plate 15 on the horizontal plane projection is consistent with the twisting direction when the twisting device 3 is loosened to release elastic deformation energy, so that the connection portion between each arc plate 15 and the conical portion 11 is prevented from being broken due to overlarge stress when the arc plates 15 are contacted with soil, meanwhile, the arc plates 15 can be inserted into the soil along with static pressure, the twisting device 3 can disturb the soil at the lower portion when the elastic deformation energy is released, so that the soil is in a looser state, more holes are generated, more holes can be filled, permeated and compacted through the grouting channel 2, and a denser and bigger pile end post grouting expansion head can be formed.
Embodiment two:
the embodiment also provides a post grouting construction method realized by the post grouting pile head, which comprises the following steps:
s1, as shown in FIG. 1, preparing a pile head upper part 100, a pile head lower part 200, a torsion device 3, a first concave-convex buckle 4, a second concave-convex buckle 4', a grouting pipe 1 and arranging a grouting channel 2; checking the performance of the torsion device 3, screwing the torsion device 3 by using external equipment to store elastic deformation energy, and assembling according to the structure of the first embodiment; specifically, step S1 includes: manufacturing a pile head upper part 100, a pile head lower part 200, a torsion device 3, a first concave-convex buckle 4 and a second concave-convex buckle 4' according to specifications, and arranging a grouting channel 2 and an arc-shaped plate 15; checking the performance of the torsion device 3, fixing the inner side end of the torsion device 3 on the fixing part 10, screwing the torsion device by using external equipment to reserve elastic deformation energy to the maximum extent, fixing the outer side end of the torsion device on the first concave-convex fastener 4, aligning the first concave-convex fastener 4 and the second concave-convex fastener 4', and clamping and connecting, thereby assembling and forming the post grouting pile head as in the first embodiment;
s2, connecting a tubular pile 16 (preferably a prestressed tubular pile or a non-prestressed tubular pile) on the end surface of the connecting plate 5 of the rear grouting pile head, which is far away from the lower part 200 of the pile head, connecting the grouting pipe 1 with the connecting plate 5 of the upper part 100 of the pile head, hoisting the tubular pile 16 and the rear grouting pile head, and gradually pressing and splicing the pile until the depth is designed; connecting the grouting pipe 1 with a grouting pump, starting the grouting pump, and performing post grouting according to the designed grouting pressure and grouting amount;
before post grouting, the first concave-convex buckle 4 and the second concave-convex buckle 4 'are completely clamped, so that the pile head upper part 100 and the pile head lower part 200 are prevented from rotating, the grouting channel 2 is blocked by the annular extension part 7 of the pile body upper part 200, the inner hollow cavity S is in a sealing state, and meanwhile, the two ends of the torsion device 3 are respectively fixed by the fixing part and the first concave-convex buckle 4, so that the torsion device can keep a torsion state through the clamping limiting effect of the first concave-convex buckle 4 and the second concave-convex buckle 4', and continuously store elastic deformation energy;
during grouting, cement slurry is pressed into the inner hollow cavity S, the lower pile head part 200 is pressed into soil under the action of grouting pressure, the first concave-convex buckle 4 is gradually separated from the clamping groove 12, so that the separation between the first concave-convex buckle 4 and the second concave-convex buckle 4 'is realized, the limit effect between the first concave-convex buckle 4 and the second concave-convex buckle 4' is relieved, the elastic deformation of the torsion device 3 can be released, the lower pile head part 200 is further driven to twist a certain angle, and the soil is driven to be disturbed by the arc-shaped plate 15, so that the soil is in a loose state and more pores are generated; simultaneously, the grouting channel 2 is communicated with the grouting pipe 1 and the inner hollow cavity S, cement slurry can flow through the grouting pipe 1, the inner hollow cavity S and the grouting channel 2, and grouting pressure is enough to open the plugging plate 13 and flow out the cement slurry; in the disturbed loose soil body, cement slurry can enter a larger soil body range, and more, larger and deeper pores can be filled, permeated and compacted, so that a denser and larger post-grouting expansion head is formed;
still further, because torsion device 3 elastic deformation can release the back and cause pile body lower part 200 to twist reverse, spacing effect between first unsmooth buckle 4 and the unsmooth buckle 4' of second is relieved, the convex part no longer corresponds the block with the depressed part, the contact of protruding buckle has guaranteed the axial pressure stability, and pile head upper portion 100 and pile head lower part 200 separation cavity and inside hollow cavity inside are after grouting and solidification, can have good compressive property all the time, and pile soil mixture that the grout ratio is higher has been formed at the pile end, grouting effect is better, single pile limit bearing capacity is also higher.
S3, after grouting is finished and curing is carried out for 25-30 days, static load test is carried out to check the bearing capacity of the single pile, and in the embodiment, the grouting termination pressure is 2-4 MPa in soft soil.
It should be noted that the technical features in the first and second embodiments may be combined arbitrarily, and the combined technical solutions all belong to the protection scope of the present application.
In summary, the post grouting pile head and the post grouting construction method can form a denser post grouting expansion head on the basis of the prior art, form a pile-soil mixture with higher cement slurry proportion, effectively improve the bearing capacity of the pile end, reduce the settlement of the pile, improve the stability of the pile, have stronger practicability, and can be matched with a prestressed pipe pile or a non-prestressed pipe pile for use.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A post-grouting pile head, comprising:
the pile head is arranged at the upper part, and the center of the upper part of the pile head is connected with a grouting pipe;
the pile head lower part and the pile head upper part form an internal hollow cavity, and a grouting channel is formed on the pile head lower part;
the torsion device is arranged in the internal hollow cavity and used for storing elastic deformation energy, and one end of the torsion device is connected with the lower part of the pile head;
the first concave-convex buckle is arranged on the upper part of the pile head, and the other end of the torsion device is connected with the first concave-convex buckle;
the second concave-convex buckle is arranged on the lower part of the pile head;
the pile head upper part and the pile head lower part are connected through the clamping of the first concave-convex buckle and the second concave-convex buckle to form the internal hollow cavity, and the pile head upper part and the pile head lower part can be separated or clamped and connected along the axial direction;
when the upper part of the pile head and the lower part of the pile head are separated along the axial direction, the grouting pipe, the internal hollow cavity and the grouting channel are communicated;
the pile head upper part includes: the middle part of the connecting plate is provided with a through hole; one end of the annular extension part is connected to the end face of the connecting plate, which faces the lower part of the pile head, the other end of the annular extension part extends towards the lower part of the pile head, and a notch part for accommodating the first concave-convex buckle is formed in one side, close to the internal hollow cavity, of the annular extension part;
the pile head lower part includes: a body portion having a hollow interior; the fixing part is connected to the middle part of the end surface of the main body part, which is close to the upper part of the pile head, so that one end of the torsion device is connected; and a tapered portion connected to an end surface of the main body portion remote from the pile head upper portion;
the second concave-convex buckle is arranged on the end face of the main body part, which is close to the upper part of the pile head, and a clamping groove for accommodating the corresponding annular extension part at the notch part is formed between the second concave-convex buckle and the inner wall surface of the main body part;
the height of the first concave-convex buckle is half of the depth of the notch, and the height of the annular extension part is larger than the depth of the notch;
the grouting channel penetrates through the clamping groove and the conical part.
2. The post-grouting pile head of claim 1, wherein the tapered portion is provided with a blocking plate for blocking a grouting outlet of a grouting passage formed on the tapered portion.
3. The post-grouting pile head according to claim 2, wherein the outer wall surface of the conical part is provided with a plurality of evenly distributed arc plates, the open ends of the arc plates face the grout outlet, and the protruding direction of the arc plates on the horizontal plane projection is consistent with the torsion direction when the torsion device releases elastic deformation energy.
4. A post-grouting pile head as claimed in claim 3, characterised in that the open end of the arcuate plate is 60-120 mm from the grout outlet.
5. A post-grouting pile head as claimed in any one of claims 1 to 4, wherein the torsion device is a spiral spring.
6. The post grouting construction method is characterized by comprising the following steps of:
s1, preparing an upper part of a pile head, a lower part of the pile head, a torsion device, a first concave-convex buckle, a second concave-convex buckle and a grouting pipe, and arranging a grouting channel; checking the performance of a torsion device, screwing the torsion device by using external equipment to store elastic deformation energy, and assembling according to the structural arrangement mode of the post grouting pile head of any one of claims 1-5;
s2, connecting the assembled post grouting pile head with a first section of pipe pile, connecting the first section of grouting pipe with the upper part of the pile head, hoisting the pipe pile and the pile head, and gradually pressing and splicing the pile until the depth is designed;
s3, the grouting pipe is connected with a grouting pump, the grouting pump is started, post grouting is carried out according to the designed grouting pressure and grouting amount, and static load test is carried out after grouting is finished and maintenance is carried out for 25-30 days to check the bearing capacity of the single pile.
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| CN201810340103.0A CN108532592B (en) | 2018-04-16 | 2018-04-16 | Post grouting pile head and post grouting construction method |
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| CN109137891B (en) * | 2018-10-24 | 2020-08-14 | 东阳市天杨建筑工程设计有限公司 | Building foundation pile structure |
| CN110805037B (en) * | 2019-11-11 | 2021-06-01 | 宝山钢铁股份有限公司 | One-time pile sinking construction method for precast tubular pile |
| CN112942316A (en) * | 2021-01-29 | 2021-06-11 | 江苏地基工程有限公司 | Prefabricated square pile and construction process thereof |
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