CN110952534A - Construction method of karst geological cast-in-place pile - Google Patents
Construction method of karst geological cast-in-place pile Download PDFInfo
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- CN110952534A CN110952534A CN201911302898.7A CN201911302898A CN110952534A CN 110952534 A CN110952534 A CN 110952534A CN 201911302898 A CN201911302898 A CN 201911302898A CN 110952534 A CN110952534 A CN 110952534A
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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 of a karst geological cast-in-place pile, which comprises the following steps: 1) measuring and lofting and pile positioning; 2) the first section is used for excavating earthwork and pouring a protection arm; 3) repeatedly digging soil, and constructing a protective wall to a small karst cave; 4) arranging a small karst cave rib frame and assembling an assembled type guard arm; 5) filling the small karst cave cavity by pouring; 6) repeatedly digging soil, and constructing a protective wall to a large karst cave; 7) assembling and supporting the arm protecting steel die; 8) pouring a large karst cave section protecting wall; 9) continuing to excavate earthwork, and constructing a retaining wall until the design depth is reached; 10) and (5) hoisting a reinforcement cage, and pouring concrete to form a pile. The invention has the beneficial effects that: the prefabricated slab is prefabricated in a factory and transported to a site for assembly, so that the construction efficiency is greatly improved, the construction period is shortened, and the technical benefit is remarkable; the built-in reinforcement frame and the cavity pouring filling structure in the karst cave can improve the overall stability of the karst cave, so that the stability of a pile foundation at the karst cave is improved.
Description
Technical Field
The invention relates to the field of pile foundation engineering, in particular to a construction method of a karst geological cast-in-place pile.
Background
The karst geology of China is mainly and intensively distributed in the cloud, noble and Sichuan provinces, two Guangdong and two lake partial areas and the like, along with the rapid development of the economy of China, the deep implementation of the western major development strategy, the construction strength of the infrastructure of the areas is continuously increased, and the large civil and public construction is continuously planned and constructed, so that a large number of engineering problems caused by the karst geology need to be processed. When the cast-in-place pile is constructed in the areas, the karst probability of different forms and different quantities and different hazards is extremely high, so that how to treat small and large karst caves on the sides of the pile in the construction process of the cast-in-place pile is important to ensure the construction safety and the construction quality. At present, no patent is provided for how to treat various types of karst caves on the side of the cast-in-place pile.
Therefore, a construction method of karst geological cast-in-place pile which can effectively treat various karst caves at the side of the cast-in-place pile and has rapid construction and high quality is needed to be found.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a construction method of a karst geological cast-in-place pile.
The construction method of the karst geological cast-in-place pile comprises the following construction steps:
firstly, carrying out measurement lofting and pile hole positioning according to advanced geological forecast;
excavating earthwork of a first section of pile hole, and pouring a standard section of protective wall; firstly excavating earthwork in the middle part of a pile hole, then expanding excavation towards the periphery, excavating to a designed pile diameter, binding reinforcing steel bars, supporting a template, pouring retaining wall concrete, and dismantling the retaining wall template after the strength of the concrete meets the requirement;
thirdly, continuing excavating earthwork, and constructing a standard joint protecting wall until encountering a small karst cave;
step four, hanging the built-in reinforcement frame into a small karst cave cavity for fixation, assembling the prefabricated slab in a ring-shaped closed structure, and adopting double-assembled-ring-beam reinforced connection;
pouring and filling a cavity of the karst cave; conveying concrete into the cavity of the karst cave through a concrete pouring port, vibrating and compacting, and pouring and filling the karst cave to integrate the karst cave rock body and the assembled dado;
step six, continuing excavating earthwork, and constructing a standard joint protecting wall until encountering a large karst cave;
step seven, adopting an annular assembled steel frame construction platform to construct assembly and support of the assembled and finalized inner supporting steel mould; the built-in temporary support frame and the outer side support system of the retaining wall steel mould jointly act to fix the retaining wall steel mould;
step eight, pouring the large-scale karst cave section retaining wall, and dismantling the retaining wall steel mould after the strength of the concrete meets the requirement;
step nine, continuing to excavate earthwork, and constructing a standard joint retaining wall until the design depth is reached;
step ten, binding a reinforcement cage, lifting the reinforcement cage into the pile hole, and pouring concrete to form the pile.
Preferably, the method comprises the following steps: and in the fourth step, the built-in reinforcement frame is a reinforcement cage manufactured according to the size of the small karst cave cavity, and the built-in reinforcement frame is fixedly connected with a vertical reinforcement arranged at the bottom of the karst cave.
Preferably, the method comprises the following steps: and in the fourth step, the annular closed structure of the prefabricated slab is formed by assembling the standard units of the prefabricated slab with bolt holes at two ends into an assembled retaining wall, and the joints of the retaining walls at the two ends of the standard units of the assembled prefabricated slab are connected by adopting mortar and assembled in a bolt reinforcing connection mode.
Preferably, the method comprises the following steps: in the fourth step, the double-spliced ring beam consists of two ring beam standard units and is used for reinforcing and connecting an upper section of assembled type retaining wall and a lower section of assembled type retaining wall, the concave-convex splicing positions of the ring beam and the retaining wall and the joint positions of the ring beam are connected through mortar, the concave-convex splicing positions of the ring beam and the retaining wall are positioned at the upper end and the lower end of the ring beam standard units, and the joint positions of the ring beam are positioned at two sides of the ring beam standard units.
Preferably, the method comprises the following steps: and seventhly, assembling and fixing the upright posts and the inclined support rods through bolts and nuts, and arranging an annular construction platform plate at the upper ends of the upright posts.
Preferably, the method comprises the following steps: and seventhly, fixedly assembling the retaining wall steel die unit into the retaining wall steel die according to the thickness requirement of the designed retaining wall by using a long bolt and a fixed adjusting nut.
Preferably, the method comprises the following steps: and seventhly, supporting the retaining wall steel mould on the karst cave rock body by a cross bar with a telescopic support arranged at one side of the karst cave through a rod end.
Preferably, the method comprises the following steps: and step seven, the built-in temporary support frame is formed by splicing an upright rod and a cross rod, wherein the rod end of the upright rod is provided with a telescopic support, and the upright rod and the cross rod are connected through bolts.
Preferably, the method comprises the following steps: and seventhly, the diameter of the assembly and sizing internal support steel mould of the karst cave section is larger than that of the standard section retaining wall of the pile hole.
The invention has the beneficial effects that:
(1) the prefabricated slab is prefabricated in a factory and transported to a site for assembly, so that the construction efficiency is greatly improved, the construction period is shortened, and the technical benefit is remarkable.
(2) The built-in reinforcement frame and the cavity pouring filling structure in the karst cave can improve the overall stability of the karst cave, so that the stability of a pile foundation at the karst cave is improved.
(3) The assembling and sizing internal support steel die is convenient to assemble, high in stability, reusable and remarkable in technical benefit.
(4) The telescopic support of the built-in temporary support frame can be used for adjusting the length of the rod in a telescopic mode, so that the template is convenient to bear better, the stress deformation of the template during concrete pouring is reduced, and the template is convenient to disassemble and assemble.
Drawings
FIG. 1 is a process flow diagram of construction of karst geological cast-in-place pile
FIG. 2 is a schematic illustration of a bored pile traversing karst geology;
FIG. 3 is a schematic view of a circumferential closed structure of the prefabricated panels;
FIG. 4 is a schematic view of a modular unit of prefabricated panels;
FIG. 5 is a schematic view of a double-split beam reinforced joint;
FIG. 6 is a schematic view of a ring beam standard cell;
FIG. 7 is a schematic view of a built-in reinforcing frame of a pile side karst cave;
FIG. 8 is a schematic diagram of pile side karst cave concrete pouring and filling;
FIG. 9 is a schematic view of a built-in temporary corbel;
FIG. 10 is a schematic view of a splicing and sizing internal bracing steel mold;
FIG. 11 is a schematic view of an annular assembled steel frame construction platform.
Description of reference numerals: 1, assembling type protecting wall; 2, pile hole; 3-seam of the protective wall; 4, standard units of prefabricated plates; 5-bolt hole; 6-double-spliced ring beam; 7, assembling the ring beam and the retaining wall in a concave-convex mode; 8, a ring beam standard unit; 9-ring beam joint; 10-cavern cavity; 11-karst cave outline; 12-pouring concrete in the karst cave into a filling area; 13-a built-in rib frame; 14-vertical ribs; 15-concrete pouring opening. 16-a wall protecting steel mould; 17-erecting a rod; 18-a cross-bar; 19-a telescopic support; 20-concave-convex splicing positions of the templates; 21-long bolt; 22-fixing the adjusting nut; 23-upright post; 24-diagonal brace rods; 25-bolt and nut; 26-large karst cave section protecting wall; 27-annular construction platform plate; 28-standard knot retaining wall.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The construction method of the karst geological cast-in-place pile comprises the following steps:
(1) and carrying out measurement lofting and pile hole positioning according to the advanced geological forecast.
(2) And excavating the earthwork of the first section of pile hole, and pouring a standard section of protective wall 28. The excavation depth is 1m, firstly, the earthwork of the middle part of the pile hole is excavated, then, the periphery is expanded and excavated, the pile diameter is excavated to the designed diameter, reinforcing steel bars are bound, a formwork is supported, the retaining wall concrete is poured, and the retaining wall formwork is dismantled after the strength of the concrete meets the requirement.
(3) And continuously excavating earthwork, and constructing a standard knot protecting wall 28 until meeting the small karst cave.
(4) And hanging the built-in reinforcement frame into a small karst cave cavity 10 for fixation, assembling the prefabricated slab into a ring-shaped closed structure, and adopting double-assembled-ring beams 6 for reinforced connection, as shown in figures 3,5 and 7.
(5) And pouring and filling the cavity of the karst cave. Concrete is conveyed into the cavity of the karst cave through the concrete pouring port 15 and is compacted by vibration, and the karst cave is poured and filled to integrate the karst cave rock body and the assembled dado 1 as shown in figure 8.
(6) And continuing to excavate earthwork, and constructing a standard joint retaining wall 28 until meeting the large karst cave.
(7) Assembling and supporting a shaped internal supporting steel mould by using an annular assembled steel frame construction platform, fixedly assembling a dado steel mould unit into a dado steel mould 16 according to the designed dado thickness by using long bolts 21 and fixed adjusting nuts 22, supporting the dado steel mould 16 on a karst cave rock mass by a cross rod 18 with a telescopic support 19 arranged at a rod end on one side of the karst cave, assembling a vertical rod 17 with the telescopic support 19 at the rod end and the cross rod 18 into a built-in temporary support frame by connecting and assembling the vertical rod 17 and the cross rod 18 with the telescopic support 19 at the rod end through bolts, and fixing the dado steel mould 16 under the combined action of the support of the inner side and the outer side of the dado steel mould 16, as shown in fig..
(8) And pouring the large-scale karst cave section retaining wall 26, and dismantling the retaining wall steel mould 16 after the strength of the concrete meets the requirement, as shown in figure 2.
(9) And continuing to excavate earthwork, constructing a standard knot retaining wall 28 until the design depth, and arranging a pile bottom enlarged head according to requirements.
(10) Binding the reinforcement cage of the cast-in-place pile according to the design requirement, hoisting the reinforcement cage into the pile hole by using a hoisting machine, and pouring concrete to form the pile.
More specifically, in the fourth step, the built-in reinforcement frame 13 is a reinforcement cage manufactured according to the size of the small cavern cavity 10, and the built-in reinforcement frame 13 is fixedly connected with a vertical rib 14 arranged at the bottom of the cavern.
More specifically, in the fourth step, the prefabricated slab annular closed structure is formed by assembling prefabricated slab standard units 4 with bolt holes 5 at two ends into a prefabricated retaining wall 1, and retaining wall joints 3 at two ends of the prefabricated slab standard units 4 are connected by adopting mortar and assembled in a bolt reinforcement connection mode.
More specifically, in the fourth step, the double-spliced ring beam 6 is composed of two ring beam standard units 8 and used for reinforcing and connecting the upper section and the lower section of the assembled retaining wall 1, the concave-convex splicing part 7 of the ring beam and the retaining wall and the joint 9 of the ring beam are connected through mortar, the concave-convex splicing part 7 of the ring beam and the retaining wall is positioned at the upper end and the lower end of the ring beam standard unit 8, and the joint 9 of the ring beam is positioned at two sides of the ring beam standard unit 8.
More specifically, in the seventh step, the annular assembled steel frame construction platform is assembled and fixed by the upright 23 and the diagonal brace 24 through the bolt and the nut 25, and the upper end of the upright 23 is provided with the annular construction platform plate 27.
More specifically, in the seventh step, the diameter of the assembly and sizing internal support steel die of the karst cave section is 300mm larger than the diameter of the standard node retaining wall 28 of the pile hole, because the diameter of the pile hole at the large karst cave is increased by 300mm, and a layer of retaining wall reinforcement can be made in the karst cave section in case that the karst expands or slides downwards to influence the retaining wall.
Claims (9)
1. A construction method of a karst geological cast-in-place pile is characterized by comprising the following steps: the method comprises the following steps:
firstly, carrying out measurement lofting and pile hole positioning according to advanced geological forecast;
step two, excavating earthwork of a first section of pile hole, and pouring a standard section of protective wall (28); firstly excavating earthwork in the middle part of a pile hole, then expanding excavation towards the periphery, excavating to a designed pile diameter, binding reinforcing steel bars, supporting a template, pouring retaining wall concrete, and dismantling the retaining wall template after the strength of the concrete meets the requirement;
thirdly, earth excavation is continued, and a standard knot protecting wall (28) is constructed until a small karst cave is met;
hoisting the built-in reinforcement frame (13) into a small karst cave cavity (10) for fixing, assembling the prefabricated slab in a ring-shaped closed structure, and reinforcing the connection by adopting double-assembled-ring beams (6);
pouring and filling a cavity of the karst cave; conveying concrete into the cave cavity (10) through a concrete pouring opening (15), vibrating to compact, and pouring and filling the cave to integrate the cave rock body and the assembled dado (1);
step six, continuing excavating earthwork, and constructing a standard joint protecting wall (28) until encountering a large karst cave;
step seven, adopting an annular assembled steel frame construction platform to construct assembly and support of the assembled and finalized inner supporting steel mould; the built-in temporary support frame and the outer side support system of the retaining wall steel mould jointly act to fix the retaining wall steel mould (16);
step eight, pouring the large-scale karst cave section retaining wall (26), and dismantling the retaining wall steel mould (16) after the concrete strength meets the requirement;
step nine, continuing to excavate earthwork, and constructing a standard joint retaining wall (28) until the design depth;
step ten, binding a reinforcement cage, lifting the reinforcement cage into the pile hole, and pouring concrete to form the pile.
2. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: in the fourth step, the built-in reinforcement frame (13) is a reinforcement cage manufactured according to the size of the small karst cave cavity (10), and the built-in reinforcement frame (13) is fixedly connected with a vertical reinforcement (14) arranged at the bottom of the karst cave.
3. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: in the fourth step, the annular closed structure of the prefabricated slab is formed by assembling prefabricated slab standard units (4) with bolt holes (5) at two ends into an assembled retaining wall (1), and retaining wall joints (3) at two ends of the assembled prefabricated slab standard units (4) are connected by adopting mortar and assembled in a bolt reinforcing connection mode.
4. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: in the fourth step, the double-spliced ring beam (6) is composed of two ring beam standard units (8) and used for reinforcing and connecting the upper section and the lower section of the assembled type retaining wall (1), the concave-convex splicing part (7) of the ring beam and the retaining wall and the joint (9) of the ring beam are connected through mortar, the concave-convex splicing part (7) of the ring beam and the retaining wall is positioned at the upper end and the lower end of the ring beam standard unit (8), and the joint (9) of the ring beam is positioned at two sides of the ring beam standard unit (8).
5. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: and seventhly, assembling and fixing the upright columns (23) and the inclined support rods (24) with nuts (25) through bolts, and arranging annular construction platform plates (27) at the upper ends of the upright columns (23).
6. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: and seventhly, fixedly assembling the retaining wall steel die units into the retaining wall steel die (16) according to the thickness requirement of the designed retaining wall by using long bolts (21) and fixing adjusting nuts (22) to assemble the assembling and sizing internal support steel die.
7. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: and seventhly, the outer side supporting system of the retaining wall steel mould supports the retaining wall steel mould (16) on the karst cave rock body through a cross rod (18) with a telescopic support (19) arranged at the rod end on one side of the karst cave.
8. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: and seventhly, the built-in temporary support frame is formed by splicing an upright rod (17) and a cross rod (18) of which the rod ends are provided with telescopic supports (19) through bolts.
9. The karst geological cast-in-place pile construction method according to claim 1, characterized in that: and seventhly, the diameter of the assembly and sizing internal support steel mould of the karst cave section is larger than that of a standard section guard wall (28) of the pile hole.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111549775A (en) * | 2020-05-29 | 2020-08-18 | 贵州建工集团第一建筑工程有限责任公司 | Hole pile construction method under karst geological condition |
| CN111561262A (en) * | 2020-05-29 | 2020-08-21 | 贵州建工集团第一建筑工程有限责任公司 | Hole forming method of rotary drilling rig for large-size pile hole in karst area |
| CN112796306A (en) * | 2020-12-31 | 2021-05-14 | 浙大城市学院 | Manual hole digging pile in karst area and construction method |
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