CN110016909B - Construction method for expanding reinforced bored pile by hydraulic squeezing and expanding combined bag grouting pile body - Google Patents
Construction method for expanding reinforced bored pile by hydraulic squeezing and expanding combined bag grouting pile body Download PDFInfo
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- CN110016909B CN110016909B CN201910344087.7A CN201910344087A CN110016909B CN 110016909 B CN110016909 B CN 110016909B CN 201910344087 A CN201910344087 A CN 201910344087A CN 110016909 B CN110016909 B CN 110016909B
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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
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Abstract
The invention relates to a construction method for expanding reinforced bored pile by hydraulic extrusion and expansion combined bag grouting pile body, which is characterized by comprising the following steps: after drilling is finished, placing the manufactured steel reinforcement cage and hydraulic equipment in the drill hole, wrapping the bag grouting extruding and expanding body with a bag, then lowering the steel reinforcement cage into the hole, performing hydraulic extruding and expanding, and finally performing bag grouting and concrete pouring; the construction method comprises drilling and hole forming, steel reinforcement cage manufacturing, steel sleeve, expansion plate, bag installation and the like, hydraulic equipment installation, steel reinforcement cage lowering, hydraulic extrusion and expansion construction, bag grouting, concrete pouring and hydraulic equipment cleaning and maintenance. The squeezing and expanding body can be unfolded in a corresponding soil layer, and the reinforcement is arranged in the squeezing and expanding body, so that the strength of the squeezing and expanding body and the interface strength between the squeezing and expanding body and a pile body are improved, the contact area between the squeezing and expanding body and the soil body is increased, the uplift bearing capacity is improved, the length and the distance of the cast-in-place pile are reduced, the cost is reduced, and resources are saved.
Description
Technical Field
The invention relates to the technical field of cast-in-place pile construction in pile foundation engineering, in particular to a construction method for enlarging a reinforced bored pile body by hydraulic extrusion and expansion combined bag grouting.
Background
The uplift pile is widely applied to uplift of large basement anti-floating and high-rise buildings (structures). With the general application of uplift pile construction technology, mismatching of pile body strength and uplift bearing capacity and soil body friction is paid more and more attention, the general design is to calculate pile length and single pile design uplift bearing capacity according to the design tensile strength of a map-collected pile body and combining geological survey data, a large-diameter cast-in-place pile design scheme is generally adopted for uplift piles in areas with friction bearing layers of silt clay and high-water-content low-permeability soft soil, because the diameter of the cast-in-place pile is larger, the cost of the uplift pile is increased due to overlong pile body, and the material waste phenomenon is serious due to low utilization rate of lower uplift reinforcement.
In order to solve the problems, the invention patent with the application number of 201410060511.2 discloses a cast-in-situ bored pile structure in a karst area, which is specific to the karst area, but can also be used as an uplift pile of a large basement anti-floating and high-rise building (structure), and mainly comprises the cast-in-situ bored pile, a bag-shaped grouting body and a prestressed steel cable; the original karst cave is backfilled with a clay and rubble mixture; the top of the bored pile is provided with a pile top expanding pile body, and the position of the karst cave is provided with a bag grouting body; an extruding and expanding reinforcement cage is arranged in the bag grouting body; prestressed steel cable holes are formed in the periphery of the cast-in-situ bored pile, and the top of each prestressed steel cable penetrates through the pile top to expand the pile body. The invention not only has the advantages of high construction speed, low cost and the like, but also increases the bearing capacity of a single pile by changing the action mechanism of the cast-in-situ bored pile, thereby achieving the purpose of reinforcing the foundation.
The structure realizes the improvement of the uplift resistance through the enlarged grouting body of the bag. However, the expansion degree of the bag grouting body is influenced by the soil pressure around the pile and the grouting pressure, when the soil pressure around the pile is large or the grouting pressure is small, the expansion degree is not enough, and the due effect cannot be achieved, so that the structure has strict requirements on the grouting pressure, the expansion degree of the bag grouting body is not easy to control, and the improvement of the pulling resistance is limited.
Disclosure of Invention
The invention aims to provide a construction method for enlarging a reinforced cast-in-situ bored pile by combining hydraulic extrusion and expansion with bag grouting, aiming at solving the problems in the construction of the existing pile body enlarging reinforced cast-in-situ bored pile.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a construction method for expanding a reinforced bored pile body by hydraulic extrusion and expansion combined bag grouting, which comprises the following steps of:
step 5, fixing the upper opening of the bag at the top end of the steel sleeve by using a hoop, fixing the lower opening of the bag at the outer edge of the ring plate by using the hoop, and pumping out air in the bag;
and step 10, pouring concrete immediately after the grouting of the bag, when the concrete pouring surface exceeds the top of the hydraulic equipment, contracting the expansion arm, lifting the recovered hydraulic equipment, and continuously pouring the concrete to the pile top.
Preferably, the rubber ring in the step 3 is in a ring shape, the outer diameter of the rubber ring is larger than the diameter of the expansion hole, and the inner diameter of the rubber ring is smaller than the diameter of the expansion arm; in the step 6, when the extension arm passes through the rubber ring and the extension hole, the extension arm extrudes the rubber ring, and a closed water stop structure is formed between the extension arm and the extension hole.
Preferably, in step 4, the expansion plate is an arc plate with eight same block sizes, the expansion plate is spliced into a cylinder shape when not expanded, an arc base plate corresponding to the expansion arm is arranged on the inner wall of each expansion plate, a circular groove with the depth of 5mm matched with the expansion arm is arranged on the inner side of each arc base plate, and lines for enhancing the interface connection strength are arranged on the surface of the expansion plate.
Preferably, in the step 4, a telescopic closed bag is further arranged between the steel sleeve and the base plate corresponding to the expansion hole and the circular groove, the closed bag is cylindrical, and two ends of the closed bag are respectively connected with the outer wall of the steel sleeve and the inner wall of the base plate.
Preferably, in step 8, the extension plate is moved outward until the wire rope reaches a tightened state.
Preferably, the top end of the steel sleeve and the outer ring of the lower annular plate are both provided with fixing grooves, and in the step 5, the upper edge and the lower edge of the bag are respectively fixed in the upper fixing groove and the lower fixing groove.
Preferably, in the step 3, after the steel sleeve is welded to the reinforcement cage, a plurality of rows of uniformly arranged studs are welded to the inner side wall and the outer side wall of the steel sleeve.
Preferably, in the step 4, a reserved hole is reserved on the anchor connecting piece on the expansion plate and the steel sleeve, the anchor connecting piece is arranged at the reserved hole and is subjected to anti-leakage treatment, and two ends of the steel cable are fixed through the anchor connecting piece.
Preferably, in step 5, after the upper end and the lower end of the bag are fixed, the middle part of the bag is tightly attached to the outer surface of the expansion plate through the elastic cord.
Preferably, in the step 9, the grouting pressure is greater than 2.0 MPa.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the invention forms the squeezing and expanding body through the hydraulic device, the size of the squeezing and expanding body is controllable, the squeezing and expanding quality can be judged through the telescopic length of the expanding arm, the influence of the soil pressure around the pile and the grouting pressure is small, and the quality is easy to ensure.
2. The hydraulic extrusion-expansion body can be selected to extrude and expand in a better soil layer according to the soil layer condition, the height and the diameter of the extrusion-expansion can be controlled, and the construction adaptability is strong.
3. The hydraulic device forms the extruding and expanding body which can improve the uplift resistance, correspondingly reduce the length and the diameter of the cast-in-place pile or the distance between the cast-in-place piles, reduce the use amount of materials such as cement, reinforcing steel bars and the like and reduce the cost.
4. The squeezing and expanding body is unfolded in a corresponding soil layer, belongs to an end bearing friction uplift pile, increases the contact area of the pile body and the soil body, and improves the pile-soil friction force and the uplift bearing capacity of a single pile.
5. The bag wraps the squeezing and expanding body, so that the contact between the squeezing and expanding body and underground water is reduced, and the construction quality and the safety of the squeezing and expanding body are improved.
Drawings
FIG. 1 is a schematic diagram of the structure after completion of step 1;
FIG. 2 is a schematic diagram of the structure after completion of step 5;
FIG. 3 is a schematic diagram of the structure after completion of step 6;
FIG. 4 is a schematic diagram of the structure after completion of step 7;
FIG. 5 is a schematic diagram of the structure after completion of step 8;
FIG. 6 is an initial cross-sectional view (section A-A) of the reamed portion;
FIG. 7 is a cross-sectional view (B-B section) of a squeezed section after hydraulic squeezing;
FIG. 8 is a cross-sectional view (C-C section) of the reamed portion of the bladder after grouting;
FIG. 9 is a cross-sectional view (D-D section) of the reamed portion after pouring concrete;
FIG. 10 is a state diagram of the extension arm when the hydraulic companding device is installed;
FIG. 11 is a state diagram of the expanding arm after the hydraulic extruding and expanding device is extruded and expanded;
FIG. 12 is a state diagram of the extension arm when the hydraulic squeezing and expanding device is recovered;
fig. 13 is a flow chart of a construction method of a hydraulic squeezing and expanding combined bag grouting pile body expanding reinforced bored pile.
The figure is marked with: 1-ground, 2-drilling, 3-steel reinforcement cage, 4-steel sleeve, 41-fixing groove, 42-stud, 43-expanding hole, 44-grouting hole, 45-rubber ring, 51-ring plate, 52-inner clamping plate, 53-outer clamping plate, 6-bag, 7-expanding plate, 8-backing plate, 9-sealing bag, 101-steel cable, 102-anchoring piece, 11-hydraulic equipment, 111-expanding arm, 112-lifting rope, 113-lifting ring, 114-hydraulic pipe, 12-grouting pipe, 13-cement paste, 14-concrete and 15-pile soil body.
Detailed Description
In order to further understand the present invention, the following embodiments will be described in detail with reference to fig. 1 to 13, and the following embodiments are implemented on the premise of the technical solution of the present invention, and the detailed embodiments are given, but the scope of the present invention is not limited to the following embodiments.
The invention relates to a hydraulic extrusion-expansion combined bag grouting pile body expansion reinforced cast-in-situ bored pile, which is shown by combining with accompanying drawings 5 and 9 and comprises a cast-in-situ pile body, wherein the cast-in-situ pile body comprises a steel reinforcement cage 3 and concrete 14, the length of the cast-in-situ pile is 22m, the diameter of the cast-in-situ pile is 1m, longitudinal bars of the steel reinforcement cage are hot-rolled ribbed HRB400 phi 16, stirrups are spiral hoops HPB235 phi 8@100, and the strength grade of the concrete is C30. The pile body of the cast-in-place pile is circumferentially provided with at least one bag grouting squeezing body (in the embodiment, a bag grouting squeezing body is arranged as an example), the maximum diameter of the bag grouting squeezing body is 1.25m, the bag grouting squeezing body comprises a steel sleeve 4, an expansion plate 7, a bag 6 and cement slurry 13, the height of the steel sleeve 4 is 1.1m, the thickness of the steel sleeve 4 is 5mm, and the height of the expansion plate 7 is 1 m.
The steel sleeve 4 is welded with the steel reinforcement cage 3, a grouting hole 44 and two rows of expansion holes 43 are arranged on the steel sleeve 4, 8 expansion holes 43 are arranged in each row, the aperture of each expansion hole 43 is 2cm, a plurality of layers of studs 42 uniformly distributed according to the circumference are arranged on the inner wall and the outer wall of the steel sleeve 4 and used for enhancing the connection strength of the steel sleeve 4 with concrete 14 and cement slurry 13, a rubber ring 45 is arranged on the inner side of each expansion hole 43, the outer diameter of each rubber ring 45 is 4cm, the inner diameter of each rubber ring is 1.5cm, a grouting pipe 12 communicated with the grouting hole 44 is arranged at the position of the steel reinforcement cage 3, and a check valve is arranged at the lower end of each grouting pipe 12 and only allows the cement slurry to move downwards and prevents the cement slurry.
The expansion plate 7 is annularly arranged on the outer side of the steel sleeve 4, reserved holes are reserved in the steel sleeve 4 and the expansion plate 7, an anchoring piece 102 is arranged at the reserved holes and is subjected to anti-leakage treatment, the steel sleeve 4 and the expansion plate 7 are connected through a steel cable 101, and two ends of the steel cable 101 are connected with the anchoring piece 102. Expansion plate 7 establish eight altogether, and every expansion plate 7's structure and size are all the same, expansion plate 7 is the arc structure, expansion plate 7's inboard is equipped with backing plate 8, backing plate 8 is the arc structure, the size is 10 x 2cm, and the position one-to-one of position and expansion hole 43, the position that corresponds every expansion hole 43 between steel sleeve 4 and the expansion plate 7 all is equipped with sealing bag 9, sealing bag 9's outside one end is connected on backing plate 8's medial surface, inboard one end lug connection is at steel sleeve 4 lateral wall, sealing bag 9 is scalable.
The top of steel sleeve 4 is provided with fixed slot 41, and the bottom and the upper portion of steel sleeve 4 all are equipped with by the crown plate 51, and the crown plate height is 5cm, and the outward flange of crown plate 51 of below also is equipped with fixed slot 41, and fixed slot 41 groove depth is 3 mm. The opposite surfaces of the ring plate 51 are respectively provided with an inner clamping plate 52 and an outer clamping plate 53 which vertically correspond to each other, the inner clamping plate 52 is fixed with the ring plate 51, the outer clamping plate 53 is detachably connected with the ring plate 51, and the outer clamping plate 53 is separated from the ring plate 51 due to the fact that the expansion plate 7 is unfolded in figure 1, so that the outer clamping plate 53 cannot be seen in figure 1. The upper end and the lower end of the bag 6 are respectively fixed in the upper fixing groove 41 and the lower fixing groove 41 through hoops, so that slurry leakage caused by separation of the bag 6 is prevented, a closed space is formed between the bag 6 and the steel sleeve 4, and the cement slurry 13 is injected into the closed space through the grouting holes 44. The surface of the expansion plate 7 is provided with grains, and after the cement paste 13 is injected, the grains increase the connection strength between the expansion plate 7 and the cement paste 13.
Aiming at the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored concrete pile, the construction steps of the invention are explained by combining the attached drawing 13:
step 5, fixing the upper part and the lower part of the bag 6 on the fixing grooves 41 on the steel sleeve 4 and the lower annular plate 51 respectively by using hoops, plugging the upper opening of the grouting pipe 12 after air in the bag 6 is removed, and tightly attaching the middle part of the bag 6 to the outer surface of the expansion plate 7 by using an elastic rope, as shown in fig. 6;
fig. 10 to 12 show that when the hydraulic device is installed, a certain hydraulic thrust is applied in advance to fix the hydraulic device on the reinforcement cage, and at this time, the front end of the extension arm extends into the circular groove on the base plate, as shown in fig. 10; when the squeezing and expanding construction is carried out, the expansion arm can be expanded according to the construction requirement, and the diameter of the expansion arm is 20-40 cm larger than that of the steel sleeve at the moment, as shown in fig. 11; when the hydraulic device is recycled, the extension arm can retract, and the diameter of the extension arm is 5-20 cm smaller than that of the steel sleeve at the moment, as shown in figure 12.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A construction method for expanding a reinforced bored pile by hydraulic extrusion and expansion combined with bag grouting of a pile body is characterized by comprising the following steps:
step 1, drilling to form a hole;
step 2, manufacturing a reinforcement cage (3);
step 3, welding a steel sleeve (4) with a reserved grouting hole (44) and an expansion hole (43) at a position corresponding to the diameter expansion position on the steel reinforcement cage (3), installing a rubber ring (45) at the inner side of the expansion hole (43), installing a grouting pipe (12) in the steel reinforcement cage (3), and arranging a check valve at the lower end of the grouting pipe (12) and connecting the check valve to the grouting hole (44);
step 4, welding ring plates (51) at the upper end and the lower end of the outer wall of the steel sleeve (4), welding corresponding inner clamping plates (52) on the opposite surfaces of the upper ring plate and the lower ring plate (51), connecting a plurality of expansion plates (7) at the outer side of the steel sleeve (4) by using steel cables (101), and temporarily fixing the inner side surfaces of the upper end and the lower end of each expansion plate (7) by using outer clamping plates (53);
step 5, fixing the upper opening of the bag (6) at the top end of the steel sleeve (4) by using a hoop, fixing the lower opening of the bag (6) at the outer edge of a ring plate (51) by using the hoop, and exhausting air in the bag (6);
step 6, hoisting the hydraulic equipment (11) to an expanding position, aligning an expansion arm (111) of the hydraulic equipment (11) with an expansion hole (43), applying initial hydraulic pressure to enable the expansion arm (111) to penetrate through a rubber ring (45) and the expansion hole (43), and enabling the end part of the expansion arm (111) to extend into a circular groove on a backing plate (8) on the inner side of an expansion plate (7) to maintain the current hydraulic state;
step 7, putting the reinforcement cage (3) and the hydraulic equipment (11) into the drill hole (2) together;
step 8, applying hydraulic pressure through a hydraulic pipe (114) on the hydraulic equipment (11) to enable the expansion arm (111) to synchronously push outwards, and enabling the expansion plate (7) to synchronously move outwards and extrude and expand the soil body (15) around the pile;
9, grouting into the bag (6) through a grouting pipe (12) to form cement paste (13);
and 10, pouring concrete (14) immediately after the grouting of the bag, when the pouring surface of the concrete (14) exceeds the top of the hydraulic equipment (11), contracting the expansion arm (111), hoisting and recovering the hydraulic equipment (11), and continuously pouring the concrete (14) to the pile top.
2. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: the rubber ring (45) in the step (3) is in a circular ring shape, the outer diameter of the rubber ring is larger than the diameter of the expansion hole (43), and the inner diameter of the rubber ring is smaller than the diameter of the expansion arm (111); in the step 6, when the extension arm (111) passes through the rubber ring (45) and the extension hole (43), the extension arm (111) presses the rubber ring (45), and a sealed water stop structure is formed between the extension arm (111) and the extension hole (43).
3. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: in step 4, expansion plate (7) are the same arc of eight piece sizes, and it is cylindric to splice each other when expansion plate (7) do not expand, all is equipped with arc backing plate (8) corresponding with expansion arm (111) on every expansion plate (7) inner wall, and the inboard of arc backing plate (8) all is equipped with the circular recess of the 5mm of degree of depth with expansion arm (111) complex, and expansion plate (7) surface is equipped with the line that is used for reinforcing interface connection intensity.
4. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1 or 3, characterized in that: in the step 4, a telescopic closed bag (9) is further arranged between the steel sleeve (4) and the backing plate (8) corresponding to the expansion hole (43) and the circular groove, the closed bag (9) is cylindrical, and two ends of the closed bag are respectively connected with the outer wall of the steel sleeve (4) and the inner wall of the backing plate (8).
5. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: in the step 8, the expansion plate (7) moves outwards until the steel cable (101) reaches a tightening state.
6. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: fixing grooves (41) are formed in the top end of the steel sleeve (4) and the outer ring of the annular plate (51) below the steel sleeve, and in the step 5, the upper edge and the lower edge of the bag (6) are respectively fixed in the upper fixing groove and the lower fixing groove (41).
7. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: in the step 3, after the steel sleeve (4) is welded on the reinforcement cage (3), a plurality of rows of uniformly arranged studs (42) are welded on the inner side wall and the outer side wall of the steel sleeve (4).
8. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: in the step 4, a reserved hole is reserved on the expansion plate (7) and the anchoring piece (102) on the steel sleeve (4), the anchoring piece (102) is arranged at the reserved hole and is subjected to anti-leakage treatment, and two ends of the steel cable (101) are fixed through the anchoring piece (102).
9. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: in the step 5, after the upper end and the lower end of the bag (6) are fixed, the middle part of the bag (6) is tightly attached to the outer surface of the expansion plate (7) through the elastic rope.
10. The construction method of the hydraulic squeezing and expanding combined bag grouting pile body expansion reinforced bored pile according to claim 1, characterized in that: in the step 9, the grouting pressure is more than 2.0 MPa.
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| CN201910344087.7A CN110016909B (en) | 2019-04-26 | 2019-04-26 | Construction method for expanding reinforced bored pile by hydraulic squeezing and expanding combined bag grouting pile body |
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| CN201910344087.7A CN110016909B (en) | 2019-04-26 | 2019-04-26 | Construction method for expanding reinforced bored pile by hydraulic squeezing and expanding combined bag grouting pile body |
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| CN110016909B true CN110016909B (en) | 2021-04-09 |
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Families Citing this family (4)
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| CN110805034A (en) * | 2019-11-14 | 2020-02-18 | 江苏长江机械化基础工程有限公司 | Circumferential rotation swinging grouting reinforcement construction method for defected cast-in-place pile composite pipe combined pile |
| CN110820734B (en) * | 2019-11-26 | 2021-05-07 | 江西博慧工程技术服务有限公司 | High-performance combined friction pile structure and construction method |
| CN112878318A (en) * | 2019-12-01 | 2021-06-01 | 江苏建院营造股份有限公司 | Pocket type body expanding device and construction process applying same |
| CN113653084A (en) * | 2021-08-10 | 2021-11-16 | 北京市市政一建设工程有限责任公司 | Cast-in-situ bored pile water stopping structure and cast-in-situ bored pile construction method |
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