CN111764379B - Construction method and structure applied to reverse construction steel pipe pile - Google Patents
Construction method and structure applied to reverse construction steel pipe pile Download PDFInfo
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- CN111764379B CN111764379B CN202010556605.4A CN202010556605A CN111764379B CN 111764379 B CN111764379 B CN 111764379B CN 202010556605 A CN202010556605 A CN 202010556605A CN 111764379 B CN111764379 B CN 111764379B
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0001—Rubbers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of steel pipe column reverse construction, and discloses a construction method applied to a reverse steel pipe pile, which comprises the following steps: embedding a steel pile casing in advance, and rotary excavating a pile hole; placing a concrete prefabricated platform, fixedly connecting the concrete prefabricated platform and the steel casing through the detachable fixed connection of the positioning lugs and the positioning rods, and fixing the concrete prefabricated platform on the ground through a group of positioning piles; step three, hoisting the pile foundation reinforcement cage into the bottom of the pile hole; fourthly, hoisting the steel pipe column into the pile hole; fifthly, mounting a concrete pouring platform and a concrete guide pipe on the concrete prefabricating platform; step six, cleaning pile holes by adopting a reverse circulation method; step seven, adjusting the axial position, the central position and the verticality of the steel pipe column; and step eight, pouring concrete. The invention has the effects of convenient assembly and disassembly of the reusable concrete prefabricated platform and the reusable steel casing and high construction efficiency.
Description
Technical Field
The invention relates to the technical field of reverse construction of steel pipe piles, in particular to a construction method and a structure thereof applied to reverse construction of steel pipe piles.
Background
The steel pipe pile is also called a steel pipe column, and is a member which is used for vertical support in a building structure and simultaneously comprises concrete and steel bars. The reverse construction is a construction mode that the steel pipe pile is constructed from top to bottom, then the earthwork is cleaned, the beam plate structure is constructed, and the construction on the ground and the construction under the ground can be synchronously carried out.
The invention discloses a construction method and a structure for installing a reverse steel pipe column in a rotary excavating pile hole, wherein the conventional invention patent document with an authorization publication number of CN104141301B comprises the following steps: excavating a pile hole on the ground according to design requirements in a rotary excavating mode, and reinforcing a pile hole opening by using a steel pile casing to prevent the opening from collapsing; fixing the prefabricated reinforced concrete bearing platform at the hole opening of the pile hole by using a group of positioning piles, and welding the steel casing and the reinforcing mesh in the reinforced concrete bearing platform; hoisting the pile foundation reinforcement cage into the pile hole bottom through hoisting equipment to be positioned; vertically hoisting the steel pipe column into the pile hole through hoisting equipment, and positioning the steel pipe column on a pile foundation reinforcement cage; fifthly, mounting a concrete pouring platform and a concrete guide pipe on a reinforced concrete bearing platform of the pile hole orifice; step six, cleaning pile holes by adopting a reverse circulation method; step seven, installing temporary coupling beams at the top pipe orifices of the steel pipe columns, adjusting the axial positions of the steel pipe columns through supporting jacks positioned at two sides of a reinforced concrete bearing platform, and adjusting the central positions and the verticality of the steel pipe columns through a group of lateral jacks installed on a concrete pouring platform; and step eight, completing the pouring of the concrete in the pile foundation and the steel pipe column through the concrete guide pipe.
But realize digging pile foundation and steel-pipe column construction in succession soon through above-mentioned operation, practiced thrift time limit for a project and engineering cost, through the supplementary steel-pipe column hoist and mount of precast concrete cushion cap and steel-pipe column installing support, location and fixed process, remove the trouble of the whole sclerosis in place from, effectively accelerate the construction period, and guarantee the engineering quality. The concrete bearing platform and the concrete pouring platform can be repeatedly used, and the environmental protection performance is good.
The above prior art solutions have the following drawbacks: the steel pile casing and the reinforcing mesh in the concrete bearing platform are welded and fixed, so that the relative displacement between the steel pile casing and the reinforcing mesh can be effectively prevented, and the position accuracy of the subsequent concrete pouring and forming of the steel pipe pile is improved. But can make the degree of difficulty increase of concrete cushion cap and steel casing separation, the time that the separating operation took increases, and the inconvenient and influence efficiency of construction of used repeatedly concrete cushion cap.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction method applied to a reverse steel pipe pile, which has the effects of convenient assembly and disassembly of reusable components and high construction efficiency.
The above object of the present invention is achieved by the following technical solutions: a construction method applied to a reverse construction steel pipe pile comprises the following steps:
step one, pre-embedding a steel casing at a specified position according to design requirements, and excavating a pile hole in the inner peripheral area of the steel casing in a rotary excavating mode;
placing a concrete prefabricated platform at the pile hole, realizing the fixed connection of the concrete prefabricated platform and the steel casing through the detachable fixed connection of the positioning lug and the positioning rod, and fixing the concrete prefabricated platform on the ground through a group of positioning piles;
step three, hoisting the pile foundation reinforcement cage into the bottom of the pile hole and positioning;
vertically hoisting the steel pipe column into the pile hole, and positioning the steel pipe column on the pile foundation reinforcement cage;
fifthly, mounting a concrete pouring platform on the concrete prefabricated platform, and mounting a concrete conduit for performing concrete pouring in the pile foundation and the steel pipe column on the concrete pouring platform;
step six, cleaning pile holes by adopting a reverse circulation method;
step seven, adjusting the axial position, the central position and the verticality of the steel pipe column;
and step eight, completing the pouring of the concrete in the pile foundation and the steel pipe column through the concrete guide pipe.
Through adopting above-mentioned technical scheme, the reinforcing bar that replaces the precast concrete platform through the detachable connection of location ear and locating lever and the welded fastening of a steel casing, need not violently when split precast concrete platform and a steel casing and destroy the connection position, the split is convenient and the two is difficult for the damage, the high and repeatedly usable's of efficiency of construction precast concrete platform and steel casing long service life.
The present invention in a preferred example may be further configured to: in the second step, place concrete prefabricated platform subaerial earlier, protect a distance between section of thick bamboo and the concrete prefabricated platform according to the steel, adjust locating lever and positioning sleeve's relative position, and then adjust the relative position that concrete prefabricated platform and steel protected a section of thick bamboo for the hole that supplies the bolt to run through on locating lever and the location ear aligns, and locating lever and location ear butt, rethread bolt and nut fixed position pole and location ear.
Through adopting above-mentioned technical scheme, the horizontal position of locating lever is adjustable, and it is more convenient that the locating lever is connected with the location ear, and the specification of a steel casing can change in certain extent, and the construction degree of difficulty is lower.
The present invention in a preferred example may be further configured to: and in the second step, a moisture-proof adhesive tape is wound on the connecting part of the positioning rod and the positioning lug.
Through adopting above-mentioned technical scheme, the package of dampproofing sticky tape twines the stability of being connected of further reinforcing locating lever and location ear, but and the interval concrete, fixes a position ear and locating lever and is difficult for taking place because of adhering to the inconvenient phenomenon of concrete and dismantlement on the connection site.
The present invention in a preferred example may be further configured to: and seventhly, after the axial position, the central position and the verticality of the steel pipe column are adjusted, rechecking inspection is carried out through a total station, if an error exists, adjustment is continuously carried out, rechecking is carried out, and if no error exists, the steel pipe column and the steel casing are fixedly connected in a detachable mode through a group of radial fixing pieces.
Through adopting above-mentioned technical scheme, the recheck check through the total powerstation and the steel-pipe column is protected being connected of a section of thick bamboo and is further improved the accuracy that the steel-pipe column set up the position, reduces the possibility of steel-pipe column displacement when concrete placement, and the steel-pipe column is protected a section of thick bamboo with the steel and is torn open the ann conveniently, retrieves the convenience.
The present invention in a preferred example may be further configured to: and seventhly, after the two ends of the radial fixing piece are respectively connected with the steel pipe column and the steel casing, winding a damp-proof adhesive tape at the joint.
Through adopting above-mentioned technical scheme, the package of dampproofing sticky tape further strengthens the stability of being connected of steel-pipe column and steel casing, and can separate the concrete, and the inconvenient phenomenon of dismantlement is difficult for taking place because of adhering to the concrete on the connection part.
The invention also aims to provide a structure applied to the construction method of the reverse steel pipe pile, which has the effects of convenient assembly and disassembly of reusable components and high construction efficiency.
The above object of the present invention is achieved by the following technical solutions: the structure comprises a pile hole, a steel pipe column arranged in the pile hole, a steel casing arranged at the position of the pile hole opening, and a concrete prefabricating platform arranged on the ground, wherein a working hole is formed in the concrete prefabricating platform in a penetrating mode, a positioning sleeve is pre-buried in the inner peripheral side wall of the working hole, a positioning rod and a sliding connection of the positioning rod and the positioning sleeve are inserted in the positioning sleeve in a sliding mode, a sliding bolt is connected to the positioning sleeve in a threaded mode, the end portion of a bolt body of the sliding bolt extends into the positioning sleeve and abuts against the positioning rod, a positioning lug is fixedly arranged on the outer periphery of the steel casing corresponding to the positioning rod, and the positioning lug and the positioning rod are fixed through a bolt and a nut, and a damp-proof adhesive tape is.
Through adopting above-mentioned technical scheme, sliding construction through position sleeve and locating lever makes the position of locating lever adjustable, through the position of slip bolt and the frictional force and the packing force fixed position pole of locating lever, and then alignment location ear and locating lever, through bolt and nut fixed position ear and locating lever, wrap dampproofing sticky tape in the fixed department, realize steel and protect a section of thick bamboo and concrete prefabrication platform's detachable connection, make this construction structures's concrete placement position accuracy high, and the steel that recycles protects a section of thick bamboo and concrete prefabrication platform retrieves conveniently.
The present invention in a preferred example may be further configured to: the steel protects a top periphery ring and is equipped with pre-buried ring limit, location ear and pre-buried ring limit's top surface fixed connection, the block has the rubber backing plate between locating lever and the pre-buried ring limit.
Through adopting above-mentioned technical scheme, pre-buried ring limit person of facilitating the use supports the locating lever and fixes a position the ear jointly to the steel casing and buries the steel casing underground, and pre-buried ring limit and rubber backing plate disperse the atress, further strengthen the steel casing and concrete prefabrication platform's connection stability.
The present invention in a preferred example may be further configured to: and a plurality of soil breaking edges are fixedly arranged on the bottom surface of the embedded annular edge.
Through adopting above-mentioned technical scheme, broken ground thorn has effectively increased the area of contact of pre-buried surrounding edge with the soil layer, helps the dispersion atress and reduces the possibility that a steel protects a displacement, and the stability that sets up of this structure is better.
The present invention in a preferred example may be further configured to: encircle between a set of radial mounting of being provided with between steel-pipe column and the steel casing, the periphery of steel-pipe column and the steel casing the interior week all correspond radial mounting and have set firmly the connecting block, be provided with on the connecting block with the tip sliding connection's of radial mounting dovetail, the bottom of dovetail is sealed and the top is opened, sliding connection has heightening cushion in the dovetail, swivelling joint has the closing cap that is used for sealing the dovetail top on the top surface of connecting block, the periphery of connecting block, closing cap and radial mounting tip all twines there is dampproofing sticky tape.
Through adopting above-mentioned technical scheme, but radial mounting slippage business turn over dovetail and accessible closing cap and heighten the cushion and fix in the dovetail to realize that steel-pipe column and steel casing are torn open and ann and are convenient, can realize the difficult displacement when steel-pipe column is pour, also can realize that the steel-pipe column and the steel casing of recycling retrieve the convenience, dampproofing sticky tape makes the connection stability of steel-pipe column and steel casing good, and can dismantle the structure of connecting and be difficult for becoming to dismantle because of the concrete, construction convenience.
The present invention in a preferred example may be further configured to: the radial fixing piece is a metal pipe fitting with a rubber inner core arranged inside.
Through adopting above-mentioned technical scheme, the energy consumption shock attenuation of rubber material makes the anti deformability of radial mounting good, and this construction structure stability is good, and steel-pipe column positional stability is good.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the construction difficulty is reduced through convenient mounting and dismounting of the steel casing and the concrete prefabricated platform, and the service life of the steel casing and the concrete prefabricated platform which are recycled is prolonged;
2. the construction difficulty is reduced through convenient mounting and dismounting of the steel casing and the steel pipe column, and the service life of the recycled steel casing and the steel pipe column is prolonged;
3. the trouble of comprehensive hardening of the field is avoided through the concrete prefabricated platform, and the construction period is effectively shortened.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment.
Fig. 2 is a schematic structural view of a concrete placement platform according to an embodiment.
Fig. 3 is a schematic structural diagram of a concrete precast platform according to an embodiment.
Fig. 4 is a partially enlarged structural view of a portion a in fig. 3.
FIG. 5 is a schematic view of a radial fastener according to an embodiment.
FIG. 6 is a schematic structural view of a dovetail groove of an embodiment.
FIG. 7 is a cross-sectional view of an embodiment internal to a radial fastener.
In the figure, 1, a pile hole; 11. pile foundation reinforcement cages; 2. a steel casing; 21. pre-burying a ring edge; 22. positioning the ear; 23. breaking soil edges; 24. a rubber pad; 3. steel pipe columns; 31. temporarily connecting the beams; 41. a radial securing member; 411. a rubber inner core; 42. connecting blocks; 421. a dovetail groove; 4211. a height adjusting cushion block; 422. sealing the cover; 5. prefabricating a platform by concrete; 51. a working hole; 52. positioning the sleeve; 521. a sliding bolt; 53. positioning a rod; 54. fixing the bolt; 55. positioning the pile; 56. a fixing hole; 6. concrete pouring platform; 61. a lateral jack; 62. supporting the jack; 621. a lifting member.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the structure applied to the construction method of the reverse-construction steel pipe pile disclosed by the invention comprises a pile hole 1 arranged on the ground, a steel casing 2 for preventing the top of the pile hole 1 from collapsing, a steel pipe column 3 inserted into the pile hole 1, and a pile foundation reinforcement cage 11 arranged at the bottom of the pile hole 1, wherein the axes of the pile hole 1, the steel pipe column 3 and the steel casing 2 are overlapped, and the inner diameters of the pile hole 1, the steel pipe column 3 and the steel casing 2 are sequentially increased in order to form a sleeving structure. A concrete prefabricating platform 5 is arranged on the ground, and a concrete pouring platform 6, a supporting jack 62 and a concrete pouring pipe are arranged on the concrete prefabricating platform 5. The supporting jacks 62 are symmetrically arranged on two sides of the concrete pouring platform 6, and the top ends of the steel pipe columns 3 extend to the concrete pouring platform 6.
Referring to fig. 2, the concrete placement platform 6 is an operation platform formed by welding profile steels of various specifications, and the concrete placement platform 6 has a two-layer structure including a ladder and a steel plate and is in a shape of a square in plan view. The top of the steel pipe column 3 is higher than the upper steel plate of the concrete pouring platform 6, and temporary coupling beams 31 are symmetrically and fixedly arranged on the periphery of the top end of the steel pipe column 3. The top end of the telescopic rod of the supporting jack 62 is fixedly provided with a lifting piece 621 corresponding to the temporary connecting beam 31, and the lifting piece 621 is arranged in a U shape embedded with the temporary connecting beam 31. The lower layer of the concrete pouring platform 6 is provided with a group of lateral jacks 61, and the lateral jacks 61 are arranged in an array mode around the steel pipe column 3. One end of the lateral jack 61 is fixed with the concrete pouring platform 6, and the other end of the lateral jack 61 is abutted against the steel pipe column 3.
The concrete prefabrication platform 5 supports the concrete pouring platform 6 and the supporting jack 62, provides a foundation for positioning and adjusting the steel pipe column 3, and avoids the trouble of comprehensive hardening construction of a field. The supporting jack 62 drives the lifting piece 621 and the steel pipe column 3 to lift, and the lateral jack 61 pushes the steel pipe column 3 to horizontally displace, so that the axial position, the central position and the verticality of the steel pipe column 3 are positioned and adjusted. The concrete of two kinds of specifications has been filled in stake hole 1 intussuseption, and the regional combination through steel-pipe column 3 and pile foundation steel reinforcement cage 11 of pouring of two kinds of concrete uses and divides, and pile foundation is pour and steel-pipe pile pours and can go on in step. Above-mentioned structure can effectively shorten the construction period of reverse construction steel-pipe pile, and concrete prefabricated platform 5, concrete placement platform 6, steel protect a section of thick bamboo 2 and the equal used repeatedly of steel-pipe column 3, effectively reduce construction cost, and the feature of environmental protection is good.
Referring to fig. 3, the concrete precast platform 5 is a concrete casting with built-in steel bars, and a square working hole 51 is vertically arranged on the concrete precast platform 5 in a penetrating manner. A plurality of fixing bolts 54 with vertical axes are pre-embedded on the top surface of the concrete prefabrication platform 5, the setting positions of the fixing bolts 54 correspond to the setting positions of the concrete pouring platform 6 and the supporting jacks 62 on the concrete prefabrication platform 5, and the concrete pouring platform 6 and the supporting jacks 62 are fixedly connected with the concrete prefabrication platform 5 through the fixing bolts 54 and nuts. The concrete prefabrication platform 5 is provided with a fixing hole 56 for the positioning pile 55 to vertically penetrate through, and the concrete prefabrication platform 5 is fixed on the ground through driving the T-shaped positioning pile 55 into the ground. The concrete prefabrication platform 5 and the concrete pouring platform 6 can be sequentially arranged on the ground through the structure, the disassembly and the installation are convenient, and the concrete prefabrication platform 5 and the concrete pouring platform 6 are convenient to recover.
Referring to fig. 3 and 4, positioning sleeves 52 are embedded in the inner peripheral side wall of the working hole 51, the number of the positioning sleeves 52 is four, the positioning sleeves 52 are respectively arranged at four side lines of the working hole 51, and the length direction of each positioning sleeve 52 is perpendicular to the corresponding side line of the working hole 51. A positioning rod 53 is inserted into the positioning sleeve 52, the positioning rod 53 is connected with the positioning sleeve in a sliding manner along the axial direction, and the two are square metal pieces with matched specifications. The positioning sleeve 52 is screwed with a sliding bolt 521, and the sliding bolt 521 penetrates through one side wall of the positioning sleeve 52. The user can slide the positioning rod 53 manually, tighten the sliding bolt 521, and fix the relative position of the positioning rod 53 and the positioning sleeve 52 by the friction and pressing force between the sliding bolt 521 and the positioning sleeve 52.
Referring to fig. 3 and 4, the top peripheral of the steel casing 2 is provided with an embedded annular edge 21, positioning lugs 22 and ground breaking ribs 23 are respectively arranged above and below the embedded annular edge 21, and the positioning lugs 22 and the ground breaking ribs 23 are all arranged around the axis of the steel casing 2 in a circumferential array. The positioning lugs 22 correspond to the positioning rods 53 one by one, and the positioning lugs and the positioning rods 53 are fixed together through bolts and nuts, and a moisture-proof adhesive tape (not shown in the figure) is wound at the fixing position. The rubber backing plate 24 is placed on the embedded ring edge 21, and the top surface of the rubber backing plate 24 is abutted to the part of the positioning rod 53 above the embedded ring edge 21.
The relative position of the steel casing 2 and the concrete prefabricated platform 5 is further fixed by the connection of the positioning lugs 22 and the positioning rods 53, and the position accuracy of the subsequent concrete pouring and forming of the steel pipe pile is effectively improved. The bolt and nut connection makes the positioning lug 22 and the positioning rod 53 convenient to disassemble and assemble, so that the steel casing 2 and the concrete prefabricated platform 5 are convenient to disassemble and assemble, the connection part is not required to be violently damaged when the steel casing 2 and the concrete prefabricated platform are separated, and the service life of the repeated use is long. And the horizontal position of the positioning rod 53 can be changed, the specification of the steel casing 2 can be changed within a certain range, and the detachable connection of the steel casing 2 and the concrete prefabricated platform 5 is more convenient.
The embedded ring edge 21 facilitates the user to embed the steel protection cylinder 2 on the ground, the exposure height of the positioning steel protection cylinder 2 is convenient, and the deformation possibility of the positioning lug 22 can be further reduced by fixing the embedded ring edge 21 and the positioning lug 22. The rubber backing plate 24 can be used as a medium for stress conduction between the positioning rod 53 and the embedded annular edge 21, and the rubber backing plate 24 effectively enhances the connection stability of the steel casing 2 and the concrete prefabricated platform 5 under the combined action of energy dissipation and shock absorption characteristics, the winding of a moisture-proof adhesive tape and the supporting of the embedded annular edge 21. Meanwhile, the damp-proof adhesive tape can separate the bolt and the nut from the concrete, and the inconvenient detachment phenomenon of the positioning lug 22 and the positioning rod 53 is not easy to occur. The ground breaking prick is inserted underground, the contact area of the embedded annular edge 21 and a soil layer is increased, the possibility of dispersing stress and reducing the displacement of the steel casing 2 is facilitated, and the stability of the structure is better.
Referring to fig. 5 and 6, a set of radial fixing pieces 41 is arranged between the steel pipe column 3 and the steel casing 2 in a surrounding manner, and the number of the radial fixing pieces 41 is four in the embodiment. The outer periphery of the steel pipe column 3 and the inner periphery of the steel casing 2 are both provided with connecting blocks 42 corresponding to the radial fixing pieces 41, and the two ends of the radial fixing pieces 41 are respectively connected with the steel pipe column 3 and the steel casing 2 through the connecting blocks 42. The connecting block 42 is provided with a dovetail groove 421 slidably connected to an end of the radial fixing member 41, and a bottom end of the dovetail groove 421 is closed and a top end thereof is open. A sealing cover 422 capable of closing the top end of the dovetail groove 421 is rotatably connected on the top surface of the connecting block 42, and the rotation center line of the sealing cover 422 is parallel to the length direction of the dovetail groove 421. A height adjusting cushion block 4211 is connected in the dovetail groove 421 in a sliding manner, and when the height of the connecting block 42 on the steel pipe column 3 is unequal to that of the connecting block 42 on the steel casing 2 by the height adjusting cushion block 4211, the radial fixing piece 41 can still connect the steel pipe column 3 and the steel casing 2. The peripheries of the connecting block 42, the sealing cover 422 and the end part of the radial fixing piece 41 are all wound with moisture-proof adhesive tapes (not shown in the figure), the moisture-proof adhesive tapes are convenient to disassemble and assemble, and the moisture-proof adhesive tapes can play roles in spacing concrete and enhancing the connection stability.
The steel pipe column 3 is better in position fixing stability due to connection with the steel casing 2, the concrete pouring position is more accurate, and the construction quality is higher. The radial fixing piece 41 can slide in and out of the dovetail groove 421 and is fixed in the dovetail groove 421 through the sealing cover 422 and the moisture-proof adhesive tape, the convenient detachment and installation of the radial fixing piece 41 and the connecting block 42 enables the steel pipe column 3 and the steel casing 2 to be conveniently detached and installed, the connecting part is not required to be violently damaged when the steel pipe column 3 is separated from the steel casing 2, and the two are convenient to recover.
Referring to fig. 7, in order to further enhance the connection stability of the steel pipe column 3 and the steel casing 2, the radial fixing member 41 is a metal pipe fitting with a rubber core 411 built therein, the compressive strength of the radial fixing member 41 is high, the resistance to deformation is good, and the possibility of relative displacement after the steel pipe column 3 and the steel casing 2 are connected is further reduced.
The construction method capable of realizing the structure comprises the following steps:
step one, determining the position of a pile hole 1 on the ground according to design requirements, embedding a steel casing 2 by applying force to an embedded ring edge 21 by taking the hole position as a center, wherein the length of the part of the bottom of the steel casing 2, which penetrates into a clay layer, is not less than 0.5 m; and erecting a rotary drilling rig above the steel casing 2, realizing rotary drilling type pile hole 1 excavation through the rotary drilling rig, and dismantling the rotary drilling rig after the pile hole 1 is drilled.
Secondly, transporting the concrete prefabricated platform 5 to a construction site, placing the concrete prefabricated platform 5 at the pile hole 1, and enabling the position of the pile hole 1 to coincide with the inner peripheral area of the working hole 51; manually sliding the positioning rod 53 and screwing the sliding bolt 521, so that the position of the positioning rod 53 is matched with the position of the positioning lug 22, adjusting the relative position of the concrete prefabrication platform 5 and the steel casing 2, aligning the positioning rod 53 with a hole on the positioning lug 22 for the bolt to penetrate through, and abutting the positioning rod 53 with the positioning lug 22;
fixing the positioning rod 53 and the positioning lug 22 through a bolt and a nut, winding a moisture-proof adhesive tape on the position where the bolt and the nut are located, checking whether a gap exists between the positioning rod 53 and the embedded annular edge 21, and filling a rubber base plate 24 if the gap exists;
and then a group of positioning piles 55 are sequentially inserted into the fixing holes 56 and the bottom of the fixing holes, so that the concrete prefabricated platform 5 is fixed with the ground.
And step three, hoisting the pre-bound pile foundation reinforcement cage 11 into the bottom of the pile hole 1 by using a crane or a tower crane, and placing the pile foundation reinforcement cage 11 in the center of the pile hole 1.
And step four, connecting a lifting hook of a crane or a tower crane with the top end of the steel pipe column 3, lifting the steel pipe column 3 in an inclined lifting mode, cleaning sludge at the bottom of the steel pipe column 3, slowly placing the steel pipe column 3 into the pile hole 1, and supporting the steel pipe column 3 through the pile foundation reinforcement cage 11.
And step five, hoisting the concrete pouring platform 6 and the supporting jack 62 on the concrete prefabrication platform 5 by using a crane, fixing the concrete prefabrication platform 5 and the concrete pouring platform 6 through the fixing bolt 54 and the nut, fixing the supporting jack 62 and the concrete prefabrication platform 5 through the fixing bolt 54 and the nut, installing a concrete conduit on the concrete pouring platform 6, and enabling the concrete conduit to extend into the steel pipe column 3.
And sixthly, cleaning the pile hole 1 by adopting a reverse circulation method.
Fixing a lifting piece 621 at the top end of a telescopic rod of a supporting jack 62, welding and fixing a temporary coupling beam 31 on the periphery of the steel pipe column 3, installing a lateral jack 61 on the concrete pouring platform 6, enabling the end part of a piston rod of the lateral jack 61 to be abutted against the steel pipe column 3, adjusting the axial position of the steel pipe column 3 through the supporting jacks 62 positioned on the two sides of the concrete pouring platform 6, and adjusting the central position and the verticality of the steel pipe column 3 through a group of lateral jacks 61 installed on the concrete pouring platform 6;
after the adjustment is finished, position checking is carried out through a total station, if the position checking is not qualified, the adjustment is continued, otherwise, a radial fixing piece 41 is arranged between the steel pipe column 3 and the steel casing 2, a height adjusting cushion block 4211 is embedded in the dovetail groove 421 according to the relative position of the steel casing 2 and the steel pipe column 3, then the two ends of the radial fixing piece 41 are embedded into the dovetail groove 421, the height adjusting cushion block 4211 is clamped according to the condition whether the distance exists between the end of the radial fixing piece 41 and the top end of the dovetail groove 421, the sealing cover 422 is rotated until the top end of the dovetail groove 421 is sealed, and moisture-proof adhesive tapes are wound on the peripheries of the sealing cover 422, the connecting.
Step eight, completing the pouring of the pile foundation and the concrete in the steel pipe column 3 through a concrete guide pipe, pouring C60 concrete in the steel pipe column 3, pouring C60 concrete at the bottom of the pile foundation and pouring the rest of the pile foundation by C30 concrete; during pouring, the concrete guide pipe extends to the bottom of the pile foundation for pouring; when the concrete plane rises to the bottom opening of the steel pipe column 3, another concrete guide pipe is inserted into the steel pipe column 3, and the two concrete guide pipes are mixed by two kinds of concrete with different strengths and continuously cast at the same time until the casting elevation is reached.
The implementation principle of the embodiment is as follows: embedding a steel casing 2 in an anchor hole position, excavating a pile hole 1 through a rotary drilling rig, placing a concrete prefabricated platform 5 in the pile hole 1, enabling the end position of a positioning rod 53 to be matched with the end position of a positioning lug 22 through a sliding structure of the positioning rod 53, manually displacing the concrete prefabricated platform 5 to align the positioning rod 53 and the positioning lug 22, fixing the positioning lug 22 and the positioning rod 53 through bolts and nuts, wrapping a moisture-proof adhesive tape at a fixed position, and fixing the concrete prefabricated platform 5 on the ground through a group of positioning piles 55;
hoisting the pile foundation reinforcement cage 11 into the pile hole 1 through hoisting equipment; placing the concrete pouring platform 6 and the supporting jacks 62 on the concrete prefabrication platform 5 through hoisting equipment, installing the concrete pouring platform 6 and the supporting jacks 62 through the fixing bolts 54 and the nuts, and installing concrete guide pipes on the concrete pouring platform 6;
cleaning the pile hole 1 by adopting a reverse circulation method; arranging a temporary connecting beam 31, a lifting piece 621 and a lateral jack 61, adjusting the axial position of the steel pipe column 3 through a supporting jack 62, adjusting the central position and the verticality of the steel pipe column 3 through the lateral jack 61, adjusting and checking through a total station, and fixing the steel pipe column 3 and the steel casing 2 through the sliding connection of a radial fixing piece 41 and a dovetail groove 421, the sealing of a sealing cover 422 and the wrapping of a moisture-proof adhesive tape; the pouring of the pile foundation and the concrete in the steel pipe column 3 is completed through the concrete guide pipe;
the construction method can effectively shorten the construction period, the concrete prefabricated platform 5, the steel casing 2 and the steel pipe column 3 are detachably and fixedly connected, the concrete pouring position is accurate, the concrete prefabricated platform 5, the steel casing 2 and the steel pipe column 3 are convenient to recover, and the construction is convenient.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A construction method applied to a reverse construction steel pipe pile is characterized by comprising the following steps:
step one, pre-burying a steel casing (2) at a specified position according to design requirements, and excavating a pile hole (1) in the inner peripheral area of the steel casing (2) in a rotary excavating mode;
placing a concrete prefabricated platform (5) at the pile hole (1), fixedly connecting the concrete prefabricated platform (5) and the steel casing (2) through the detachable fixed connection of the positioning lug (22) and the positioning rod (53), and fixing the concrete prefabricated platform (5) on the ground through a group of positioning piles (55); firstly, placing a concrete prefabricating platform (5) on the ground, adjusting the relative positions of a positioning rod (53) and a positioning sleeve (52) according to the distance between a steel casing (2) and the concrete prefabricating platform (5), further adjusting the relative positions of the concrete prefabricating platform (5) and the steel casing (2), aligning the positioning rod (53) with a hole on a positioning lug (22) for a bolt to penetrate through, abutting the positioning rod (53) with the positioning lug (22), and fixing the positioning rod (53) and the positioning lug (22) through a bolt nut;
thirdly, hoisting the pile foundation reinforcement cage (11) into the bottom of the pile hole (1) and positioning;
vertically hoisting the steel pipe column (3) into the pile hole (1), and enabling the steel pipe column (3) to be located on the pile foundation reinforcement cage (11);
fifthly, mounting a concrete pouring platform (6) on the concrete prefabricated platform (5), and mounting a concrete guide pipe for performing concrete pouring in the pile foundation and the steel pipe column (3) on the concrete pouring platform (6);
cleaning the pile hole (1) by adopting a reverse circulation method;
seventhly, adjusting the axial position, the central position and the verticality of the steel pipe column (3);
and step eight, completing the pouring of the concrete in the pile foundation and the steel pipe column (3) through the concrete guide pipe.
2. The construction method applied to the reverse construction steel pipe pile according to claim 1, characterized in that: in the second step, the moisture-proof adhesive tape is wound on the connecting part of the positioning rod (53) and the positioning lug (22).
3. The construction method applied to the reverse construction steel pipe pile according to claim 1, characterized in that: and seventhly, after the axial position, the central position and the verticality of the steel pipe column (3) are adjusted, rechecking inspection is carried out through a total station, if an error exists, adjustment is continuously carried out and rechecking is carried out, and if no error exists, the steel pipe column (3) and the steel casing (2) are fixedly connected in a detachable mode through a group of radial fixing pieces (41).
4. The construction method applied to the reverse construction steel pipe pile according to claim 3, characterized in that: and seventhly, winding a moisture-proof adhesive tape at the joint after two ends of the radial fixing piece (41) are respectively connected with the steel pipe column (3) and the steel casing (2).
5. A structure applied to the construction method of the reverse-construction steel pipe pile according to any one of claims 1 to 4, comprising a pile hole (1), a steel pipe column (3) arranged in the pile hole (1), a steel casing (2) arranged at the hole opening of the pile hole (1), and a concrete precast platform (5) arranged on the ground, characterized in that: the concrete prefabrication platform (5) is gone up to run through and is provided with work hole (51), pre-buried on the interior circumference lateral wall of work hole (51) has positioning sleeve (52), positioning sleeve (52) interpolation is equipped with locating lever (53) and the two sliding connection, threaded connection has sliding bolt (521) on positioning sleeve (52), the bolt body tip of sliding bolt (521) extend to in positioning sleeve (52) and with locating lever (53) butt, the periphery of steel protects a section of thick bamboo (2) corresponds locating lever (53) and has set firmly location ear (22), location ear (22) and locating lever (53) are fixed through bolt and nut and the fixed department winding has dampproofing sticky tape.
6. The structure of claim 5, which is applied to a construction method of a reverse-construction steel pipe pile, and is characterized in that: the steel protects a peripheral ring in (2) top and is equipped with pre-buried ring limit (21), location ear (22) and the top surface fixed connection of pre-buried ring limit (21), block between locating lever (53) and pre-buried ring limit (21) has rubber tie plate (24).
7. The structure of claim 6, which is applied to a construction method of a reverse-construction steel pipe pile, and is characterized in that: and a plurality of ground breaking edges (23) are fixedly arranged on the bottom surface of the embedded annular edge (21).
8. The structure of claim 5, which is applied to a construction method of a reverse-construction steel pipe pile, and is characterized in that: encircle between steel-pipe column (3) and the steel protects a section of thick bamboo (2) and be provided with a set of radial mounting (41), the periphery of steel-pipe column (3) and the interior week of a steel section of thick bamboo (2) all correspond radial mounting (41) and have set firmly connecting block (42), be provided with on connecting block (42) with tip sliding connection's of radial mounting (41) dovetail (421), the bottom of dovetail (421) is sealed and the top is open, dovetail (421) sliding connection has heightening cushion (4211), swivelling joint has the closing cap that is used for sealing dovetail (421) top on the top surface of connecting block (42), the periphery of connecting block (42), closing cap and radial mounting (41) tip all twines there is dampproofing sticky tape.
9. The structure of claim 8, which is applied to a construction method of a reverse-construction steel pipe pile, and is characterized in that: the radial fixing piece (41) is a metal pipe fitting with a rubber inner core (411) arranged inside.
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