CN108677945B - Integrated anti-floating device of open prestressed high-strength concrete pipe pile and anti-floating anchor rod - Google Patents
Integrated anti-floating device of open prestressed high-strength concrete pipe pile and anti-floating anchor rod Download PDFInfo
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- CN108677945B CN108677945B CN201810524694.7A CN201810524694A CN108677945B CN 108677945 B CN108677945 B CN 108677945B CN 201810524694 A CN201810524694 A CN 201810524694A CN 108677945 B CN108677945 B CN 108677945B
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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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
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
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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
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
Abstract
The invention belongs to the technical field of foundation engineering, and relates to an integrated anti-floating device of an open prestressed high-strength concrete pipe pile and an anti-floating anchor rod, wherein one end of a GFRP anti-floating anchor rod body positioner is bound on a GFRP anti-floating anchor rod body, the other end of the GFRP anti-floating anchor rod body positioner is bound at a reserved hole of an annular steel plate, a fixed support is arranged on the flat ground, a centering bracket is arranged on the GFRP anti-floating anchor rod body and is connected with the open prestressed high-strength concrete pipe pile, a threaded round hole is formed in the reserved inner wall of the center of an expansion head, the expansion head is arranged on the outer surface of the top end of the GFRP anti-floating anchor rod body and is poured in a foundation slab, and a circular; the reverse L-shaped steel bar is welded with the round steel plate, the cushion layer is laid on the ground, the foundation slab is arranged on the cushion layer, the structure is simple, the installation is quick and simple, the operability is strong, the energy is saved, the environment is protected, the economic benefit and the social benefit are obvious, the construction process of independently making the anti-floating anchor rod is reduced, the construction period is shortened, and the cost is reduced.
Description
The technical field is as follows:
the invention belongs to the technical field of foundation engineering, and relates to an integrated anti-floating device of a composite anti-floating anchor rod and a prestressed high-strength concrete pipe pile, in particular to an integrated anti-floating device of an open prestressed high-strength concrete pipe pile and an anti-floating anchor rod.
Background art:
the prestressed high-strength concrete pipe pile has the advantages of industrial large-scale production, easy quality control and inspection, guaranteed pile sinking quality compared with cast-in-place pile, high single-pile bearing capacity, strong adaptability to engineering geological conditions, short construction period, no pollution on construction site and the like, is widely applied to the civil engineering fields of industrial and civil buildings, highway bridges, ports and the like, and becomes one of the most widely applied pile types in China. In particular to a prestressed high-strength concrete pipe pile constructed by adopting a static pressure method, which accords with the development direction of a green assembly type.
However, with the utilization of underground space and the increasing of the buried depth of the building foundation, the anti-floating problem also comes along. And the pressure-bearing pile can not resist the harm caused by the anti-buoyancy of underground water, so that the selection of a proper anti-buoyancy measure is very important. Compared with the anti-floating measures such as a dewatering and draining method, a weight-bearing method, an anti-floating pile and the like, the anti-floating anchor rod has the advantages of strong stratum adaptability, stress dispersion, convenience in construction, cost saving and the like, and is widely applied to the field of civil engineering. At present, the materials of the anti-floating anchor rod are mainly reinforced steel bars, the environment of the anti-floating anchor rod is poor, the anti-floating anchor rod is located in an underwater or wet and dry alternating region all year round, and chlorine ions in underground water cause the reinforced steel bar anchor rod to be chemically corroded. Particularly, in urban rail transit construction, the generated stray current causes the steel bar anchor rod to be subjected to electrochemical corrosion at the same time, and the service life of the anti-floating anchor rod is greatly shortened, so that the anti-corrosion problem of the anchor rod structure is more prominent, but the anti-corrosion problem of the anchor rod at present is not fundamentally broken through, and under the condition, the use of the anchor rod made of non-metal materials is the best choice. The GFRP (glass Fiber Reinforced polymer) material is a composite material formed by taking glass Fiber as a reinforcing material, taking synthetic resin as a base material, impregnating resin glue solutions such as unsaturated polyester resin containing various auxiliaries such as a curing agent, an accelerant and the like with Fiber yarns, and then performing pultrusion, thread winding and curing once forming.
At present, urban construction is in process as a fire, the use amount of the anti-floating anchor rod is continuously increased, and the application of the GFRP anti-floating anchor rod is beneficial to reducing the construction cost and building safety engineering, and is urgent and meaningful work. At present, the prestressed high-strength concrete pipe pile and the GFRP anti-floating anchor rod are combined to resist floating, so that on one hand, the vertical compression-resistant bearing capacity of the prestressed high-strength concrete pipe pile can be compensated, and the cost is saved; on the other hand, drilling is not needed during the construction of the anti-floating anchor rod, large-scale equipment is prevented from entering and leaving the field, the construction cost is also reduced, and therefore, the economic benefit is very obvious. Therefore, the reasonable and reliable integrated anti-floating device of the prestressed high-strength concrete pipe pile and the composite anti-floating anchor rod is urgently designed, and the anti-floating device has wide application prospect and good economic benefit.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and provides an integrated anti-floating device of an open prestressed high-strength concrete pipe pile and an anti-floating anchor rod on the premise of not increasing the cost.
In order to achieve the purpose, the main body structure of the integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod comprises a GFRP anti-floating anchor rod body positioner, a fixed support, a centering bracket, a GFRP anti-floating anchor rod body, an open prestressed high-strength concrete pipe pile, an expansion head, an inverted L-shaped steel bar, a circular steel plate, a cushion layer and a base bottom plate; one end of the GFRP anti-floating anchor rod body positioner is bound on the GFRP anti-floating anchor rod body, and the other end of the GFRP anti-floating anchor rod body positioner is bound at a reserved hole of an annular steel plate in the fixed support, so that the centered GFRP anti-floating anchor rod body is prevented from sliding downwards, and the anchoring length is ensured to meet the design requirement; the fixed support is arranged on a flat ground to ensure the stability of the fixed support; the centering bracket is arranged on the GFRP anti-floating anchor rod body and is connected with the open prestressed high-strength concrete pipe pile, so that the GFRP anti-floating anchor rod body is ensured to be positioned on the central line of the aperture of the open prestressed high-strength concrete pipe pile; the GFRP anti-floating anchor rod body is a full-thread glass fiber reinforced polymer solid anchor rod, and the anchoring length and diameter of the GFRP anti-floating anchor rod body are determined according to the anchoring force; the expansion head is made of glass fiber reinforced polymer materials (the same as the GFRP anti-floating anchor rod body), a circular hole is reserved in the center, threads are formed in the inner wall of the hole, the size of the hole is determined according to the diameter of the GFRP anti-floating anchor rod body, the diameter of the outer outline of the expansion head is 5 times of the diameter of the reserved circular hole, the expansion head is installed on the outer surface of the top end of the GFRP anti-floating anchor rod body in a thread coupling mode and poured in a base bottom plate, and epoxy resin and EP type curing agent mixed liquid with the mass ratio of 2:1 is injected at the thread coupling position of the expansion head and the GFRP anti-floating anchor rod body, so that on one hand, the stress area and the diffusion stress of an anchoring end are increased, the; the inverted L-shaped steel bar is made of smooth steel bars with the diameter of 8mm, and the length of the inverted L-shaped steel bar is determined according to the anchoring length; the thickness of the circular steel plate is 4mm, the diameter of the circular steel plate is slightly smaller than the inner diameter of the prestressed high-strength concrete pipe pile, and the circular steel plate is just placed in the open prestressed high-strength concrete pipe pile; the inverted L-shaped steel bars are welded with the round steel plates and are uniformly distributed at the edges of the round steel plates at included angles of 120 degrees, so that the anchor mortar is prevented from being injected into the whole pile length range of the open prestressed high-strength concrete pipe pile, and only the anchor mortar is injected into the anchor depth range determined by the anchor force, and the purposes of saving materials and reducing the manufacturing cost are achieved; the cushion layer is made of C15 fine stone concrete, the cushion layer is laid on the ground, the top surface of the cushion layer is leveled, the surface of the cushion layer is smooth, steel bars can be conveniently bound on the surface of the cushion layer, and the cushion layer also plays a role in protecting the foundation slab; the foundation slab is made of reinforced concrete, constructed according to the construction drawing and the requirements of the design standard of foundation of building foundation (GB 50007-2011) and arranged on the cushion layer, and the anchoring length of the GFRP anti-floating anchor rod body in the foundation slab is determined by the anchoring force.
The GFRP anti-floating anchor rod body positioner is made of iron wires, has the specification of 18#, the diameter of 1.6mm, and the length of the GFRP anti-floating anchor rod body positioner is determined according to the anchoring length of an anti-floating anchor rod.
The fixed support is formed by welding a seamless steel pipe and an annular steel plate, the height of the seamless steel pipe is adjusted by the height of an open prestressed high-strength concrete pipe pile exposed out of the ground, the height of the seamless steel pipe is at least 10cm higher than the top surface of the prestressed high-strength concrete pipe pile, the diameter of the seamless steel pipe is 10cm larger than the diameter of the prestressed high-strength concrete pipe pile, the width of the annular steel plate is 8cm, symmetrical holes are reserved in the annular steel plate, and the size of the holes enables a GFRP anti-floating anchor rod body positioner to penetrate through the holes and is used for fixing the GFRP anti-floating anchor rod body positioner, so that the GFRP anti-floating anchor rod body is prevented from sliding up and down.
The centering bracket comprises a bolt, a nut, a steel clack, a first steel sheet, a steel sleeve, a second steel sheet, a trapezoidal steel sheet, a wire rod, a seamless steel pipe with an inner mantle fiber and a stiffening rib steel sheet, wherein the steel clack is formed by uniformly dividing the seamless steel pipe at 90 degrees, the diameter of the steel clack is determined according to the diameter of a GFRP anti-floating anchor rod body, the first steel sheet is welded at two ends of the steel clack, a hole is reserved in the centroid position of the first steel sheet, the size of the hole enables the bolt to penetrate through, adjacent steel clacks are connected together in a coupling mode through the bolt and the nut, and the holding power of the steel clack and the GFRP anti-floating anchor rod body is improved by screwing the bolt and the nut; a steel sleeve is welded on an axial symmetry line of each steel clack along the outer surface of the steel clack, the steel sleeve is made of a seamless steel pipe, the thickness of the steel sleeve is 2mm, the diameter of the steel sleeve is 2.5cm, the length of the steel sleeve is determined according to the inner diameter of the open prestressed high-strength concrete pipe pile, the length of a wire rod in the steel sleeve is two times of the length of the steel sleeve, so that the length of the wire rod is determined, the wire rod is a solid iron rod with the diameter of 2cm, the surface of the wire rod is provided with threads, the side length of a second steel sheet is 5cm, the thickness of the second steel sheet is 2mm, one end of the wire rod is installed in the steel sleeve, the other end of the wire rod is welded to the shape center of the second steel sheet, the stress area of the inner wall of the open prestressed high-strength concrete pipe pile is increased, the overall stability is improved, the diameter of an inner wire rod seamless steel pipe is determined according to the diameter, the thickness is 2mm, trapezoidal steel sheet welding is at the outer wall of inner mantle fiber seamless steel pipe, weld the stiffening rib steel sheet between inner mantle fiber seamless steel pipe and the trapezoidal steel sheet, the shape of stiffening rib steel sheet is triangle-shaped, thickness is 2mm, the length of side of two right-angle sides is 3cm, be used for strengthening trapezoidal steel sheet and the intensity and the stability of inner mantle fiber seamless steel pipe, adjust the inner mantle fiber seamless steel pipe on the excellent when installation centering support, make the GFRP anti-floating stock body of rod be in the centre line of open prestressing force high strength concrete pipe pile aperture, and through adjusting inner mantle fiber seamless steel pipe make the second steel sheet hug closely on the inner wall of prestressing force high strength concrete pipe pile.
Compared with the prior art, the open prestressed high-strength concrete pipe pile not only can bear pressure, but also can resist the buoyancy of underground water, so that the compression resistance and the anti-floating are integrated, the construction process of independently making an anti-floating anchor rod is reduced, large-scale equipment such as an anchor rod drilling machine is not needed to enter a field, the construction period can be shortened, the open prestressed high-strength concrete pipe pile belongs to a precast pile (an assembly type foundation), the construction is convenient, the open prestressed high-strength concrete pipe pile can bear the pressure and the tension brought by the anti-floating, the stress characteristic of the pile is optimized, and the mechanical property of a pile body is improved; on the basis, the size (including pile diameter and pile length) of the original open prestressed high-strength concrete pipe pile can be further optimized, so that the purposes of saving materials, reducing energy consumption and saving construction cost are achieved.
Description of the drawings:
fig. 1 is a schematic diagram of a main structure principle of the integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod.
Fig. 2 is a schematic view of the centering bracket of the present invention.
FIG. 3 is a relative position diagram of the trapezoidal steel piece, the seamless steel tube with inner mantle fiber and the steel piece with stiffening ribs.
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3 according to the present invention.
Fig. 5 is a schematic structural diagram of the enlarged head according to the present invention.
FIG. 6 is a top view of the enlarged head of the present invention.
Fig. 7 is a top view of the mounting bracket of the present invention.
Fig. 8 is a cross-sectional view B-B of the anchor bracket of fig. 7 according to the present invention.
Fig. 9 is a relative position diagram of the inverted L-shaped reinforcing bar 7 and the round steel plate 8 according to the present invention.
FIG. 10 is a cross-sectional view taken along line C-C of FIG. 9
Fig. 11 is a schematic view of the structural principle of the inverted L-shaped steel bar 7 according to the present invention.
The specific implementation mode is as follows:
the present invention will be described in further detail by way of examples with reference to the accompanying drawings.
Example (b):
the main body structure of the integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod comprises a GFRP anti-floating anchor rod body positioner 1, a fixed support 2, a centering bracket 3, a GFRP anti-floating anchor rod body 4, an open prestressed high-strength concrete pipe pile 5, an expansion head 6, an inverted L-shaped steel bar 7, a circular steel plate 8, a cushion layer 9 and a base bottom plate 10; one end of the GFRP anti-floating anchor rod body positioner 1 is bound on the GFRP anti-floating anchor rod body 4, and the other end is bound on a reserved hole of an annular steel plate 2-2 in the fixed support 2, so that the centered GFRP anti-floating anchor rod body 4 is prevented from sliding downwards, and the anchoring length is ensured to meet the design requirement; the fixed support 2 is arranged on a flat ground to ensure the stability of the fixed support; the centering bracket 3 is arranged on the GFRP anti-floating anchor rod body 4 and is connected with the open prestressed high-strength concrete tubular pile 5, so that the GFRP anti-floating anchor rod body 4 is ensured to be positioned on the central line of the aperture of the open prestressed high-strength concrete tubular pile 5; the GFRP anti-floating anchor rod body 4 is a full-thread glass fiber reinforced polymer solid anchor rod, and the anchoring length and diameter of the GFRP anti-floating anchor rod body are determined according to the anchoring force; the material of the enlarged head 6 is glass fiber reinforced polymer material (the same as the material of the GFRP anti-floating anchor rod body 4), a round hole is reserved in the center, threads are formed on the inner wall of the hole diameter, the size of the hole diameter is determined according to the diameter of the GFRP anti-floating anchor rod body 4, the diameter of the outer contour of the enlarged head 6 is 5 times of the diameter of the reserved round hole, the enlarged head 6 is installed on the outer surface of the top end of the GFRP anti-floating anchor rod body 4 in a thread coupling mode and poured in the foundation slab 10, and epoxy resin and EP type curing agent mixed liquid with the mass ratio of 2:1 is injected at the thread coupling position of the enlarged head 6 and the GFRP anti-floating anchor rod body 4, so that the stress area and the diffusion stress of the anchoring end are increased; the inverted L-shaped steel bar 7 is made of smooth steel bars with the diameter of 8mm, and the length of the inverted L-shaped steel bar is determined according to the anchoring length; the thickness of the round steel plate 8 is 4mm, the diameter of the round steel plate is slightly smaller than the inner diameter of the prestressed high-strength concrete pipe pile 5, and the round steel plate 8 is just placed in the open prestressed high-strength concrete pipe pile 5; the inverted L-shaped steel bars 7 are welded with the round steel plate 8 and are uniformly distributed at the edge of the round steel plate 8 at an included angle of 120 degrees, so that the open prestressed high-strength concrete pipe pile 5 is prevented from being injected with anchoring mortar in the whole pile length range, and the anchoring mortar is only injected in the anchoring depth range determined by the anchoring force, so that the purposes of saving materials and reducing the manufacturing cost are achieved; the cushion layer 9 is made of C15 fine stone concrete, the cushion layer 9 is laid on the ground, the top surface of the cushion layer is leveled, the surface of the cushion layer is smooth, steel bars can be conveniently bound on the surface of the cushion layer, and the cushion layer also plays a role in protecting the foundation slab 10; the foundation slab 10 is made of reinforced concrete, constructed according to the construction drawing and the requirements of the design code of the foundation of the building foundation (GB 50007-2011) and arranged on the cushion layer 9, and the anchoring length of the GFRP anti-floating anchor rod body 4 into the foundation slab 10 is determined by the anchoring force.
The GFRP anti-floating anchor rod body positioner 1 is made of iron wires, is 18# in specification, is 1.6mm in diameter, and is determined according to the anchoring length of an anti-floating anchor rod.
In this embodiment, the fixing support 2 is formed by welding a seamless steel tube 2-1 and an annular steel plate 2-2, the height of the seamless steel tube 2-1 is adjusted by the height of an open prestressed high-strength concrete pipe pile 5 exposed out of the ground, the height is at least 10cm higher than the upper surface of the pile top of the prestressed high-strength concrete pipe pile 5, the diameter of the seamless steel tube is 10cm larger than the diameter of the prestressed high-strength concrete pipe pile 5, the width of the annular steel plate 2-2 is 8cm, symmetrical holes are reserved in the annular steel plate 2-2, and the GFRP anti-floating anchor rod body positioner 1 penetrates through the holes and is used for fixing the GFRP anti-floating anchor rod body positioner 1, so that the GFRP anti-floating anchor rod body 4 is prevented from sliding up and down.
The centering support 3 comprises a bolt 3-1, a nut 3-2, steel flaps 3-3, a first steel sheet 3-4, a steel sleeve 3-5, a second steel sheet 3-6, a trapezoidal steel sheet 3-7, a wire rod 3-8, an inner mantle fiber seamless steel tube 3-9 and a stiffening rib steel sheet 3-10, wherein the steel flaps 3-3 are formed by uniformly dividing a seamless steel tube at 90 degrees, the diameter of the steel flaps is determined according to the diameter of a GFRP anti-floating anchor rod body 4, the two ends of each steel flap 3-3 are respectively welded with the first steel sheets 3-4, a hole is reserved in the centroid position of each first steel sheet 3-4, the size of the hole enables the bolt 3-1 to penetrate through the hole, the adjacent steel flaps 3-3 are connected together in a coupling mode through the bolt 3-1 and the nut 3-2, and the bolt 3-1 and the nut 3-2 are tightened to improve the steel flaps 3-3 and the GFRP anti-floating anchor rod body 4 Wrapping force; a steel sleeve 3-5 is welded on the axial symmetry line of each steel clack 3-3 along the outer surface of the steel clack 3-3, the steel sleeve 3-5 is made of a seamless steel pipe, the thickness is 2mm, the diameter is 2.5cm, the length of the steel sleeve is determined according to the inner diameter of the open prestressed high-strength concrete pipe pile 5, the length of a wire rod 3-8 in the steel sleeve 3-5 is twice of the length of the wire rod 3-5 outside the steel sleeve 3-5, so that the length of the wire rod 3-8 is determined, the wire rod 3-8 is a solid iron rod with the diameter of 2cm, the surface of the wire rod is provided with threads, the side length of a second steel sheet 3-6 is 5cm, the thickness is 2mm, one end of the wire rod 3-8 is installed in the steel sleeve 3-5, the other end of the wire rod is welded on the center of the second steel sheet 3-6, and is used for increasing the, the overall stability is improved, the diameter of the inner mantle fiber seamless steel pipe 3-9 is determined according to the diameter of the wire rod 3-8, the inner mantle fiber seamless steel pipe 3-9 and the wire rod 3-8 are connected in a threaded coupling mode, the length is 3cm, the height of the trapezoidal steel sheet 3-7 is 5cm, the thickness is 2mm, the trapezoidal steel sheet 3-7 is welded on the outer wall of the inner mantle fiber seamless steel pipe 3-9, the stiffening rib steel sheet 3-10 is welded between the inner mantle fiber seamless steel pipe 3-9 and the trapezoidal steel sheet 3-7, the shape of the stiffening rib 3-10 is triangular, the thickness is 2mm, the side length of two right-angle sides is 3cm, the strength and the stability of the trapezoidal steel sheet 3-7 and the inner mantle fiber seamless steel pipe 3-9 are enhanced, the inner mantle fiber seamless steel pipe 3-9 on the wire rod 3-8 is adjusted when the centering bracket 3 is installed, the GFRP anti-floating anchor rod body 4 is positioned on the central line of the aperture of the open prestressed high-strength concrete tubular pile 5, and the second steel sheet 3-6 is tightly attached to the inner wall of the prestressed high-strength concrete tubular pile 5 by adjusting the inner mantle fiber seamless steel pipe 3-9.
The concrete process that this embodiment realized that uncovered prestressing force high strength concrete pipe pile and anti floating anchor integration are anti floating is:
(1) firstly, driving or static pressing an open prestressed high-strength concrete pipe pile 5, cleaning the inner wall of the open prestressed high-strength concrete pipe pile 5 smoothly and cleanly, and leveling the ground around the pile;
(2) uniformly welding three inverted L-shaped steel bars 7 to the edge of a circular steel plate 8 at an included angle of 120 degrees, and installing the three inverted L-shaped steel bars on the top surface of an open prestressed high-strength concrete pipe pile 5 to ensure that the distance from the bottom end of a GFRP anti-floating anchor rod body 4 to the upper surface of the circular steel plate 8 is not less than 50 cm;
(3) welding the seamless steel pipe 2-1 and the annular steel plate 2-2 together to form a fixed support 2, and symmetrically reserving holes on the annular steel plate 2-2, wherein the size of the holes can ensure that an iron wire can penetrate through the holes; then, mounting a fixed support 2, and ensuring that the lower end of the fixed support 2 is 5cm into the soil to be stable;
(4) a hole is reserved in the centroid of the first steel sheet 3-4, and the size of the hole is ensured to be enough for the bolt 3-1 to penetrate through; welding a first steel sheet 3-4 to two ends of each steel petal 3-3, welding a rigid sleeve 3-5 on an arc bisector of each steel petal 3-3, wherein the direction is outward, and coupling and connecting the four steel petals 3-3 together through bolts and nuts;
(5) tightly welding the wire rod 3-8 to the centroid of the second steel sheet 3-6 to ensure that the wire rod 3-8 is vertical to the upper surface of the second steel sheet 3-6;
(6) tightly connecting the trapezoidal steel sheets 3-7 to the outer walls of the inner mantle fiber seamless steel pipes 3-9 in a welding mode, ensuring that the upper surfaces of the trapezoidal steel sheets 3-7 are vertical to the inner mantle fiber seamless steel pipes 3-9, and welding stiffening rib steel sheets 3-10 between the inner mantle fiber seamless steel pipes 3-9 and the trapezoidal steel sheets 3-7;
(7) fixing the steel petals 3-3 on the GFRP anti-floating anchor rod body 4, improving the gripping force of the steel petals 3-3 and the GFRP anti-floating anchor rod body 4 by screwing the bolts 3-1 and the nuts 3-2, installing two sets of steel petals according to the anchoring length, wherein the distance between the two sets of steel petals is determined according to the anchoring length of the GFRP anti-floating anchor rod body 4, binding two iron wires on the GFRP anti-floating anchor rod body 4 in the middle of the two sets of steel petals, and ensuring that the steel petals cannot slide after being screwed;
(8) connecting the inner mantle fiber seamless steel tube 3-9 and the wire rod 3-8 together through thread coupling, adjusting the inner mantle fiber seamless steel tube 3-9 according to the inner diameter of the open prestressed high-strength concrete pipe pile 5, and ensuring that the length ratio of the wire rod 3-8 at the upper end and the lower end of the inner mantle fiber seamless steel tube 3-9 is 2: 1;
(9) inserting a wire rod 3-8 into a steel sleeve 3-5, positioning a GFRP anti-floating anchor rod body on a central axis of the inner diameter of the open prestressed high-strength concrete tubular pile 5 by adjusting an inner mantle fiber seamless steel pipe 3-9 on the wire rod 3-8, ensuring that a second steel sheet 3-6 is tightly attached to the inner wall of the open prestressed high-strength concrete tubular pile 5, finally fixing the length of the GFRP anti-floating anchor rod body in the open prestressed high-strength concrete tubular pile 5 to be an anchoring length design value, and ensuring that the thickness of a protective layer between the lower end of the GFRP anti-floating anchor rod body 4 and the round steel sheet 8 is not less than 20 cm;
(10) fixing two iron wires on the GFRP anti-floating anchor rod body 4 on two reserved holes of a fixed support, ensuring that each iron wire needs to be screwed and tensioned, and preventing the GFRP anti-floating anchor rod body 4 from sliding downwards;
(11) sealing the upper end of the GFRP anti-floating anchor rod body 4 by using a plastic film (preventing mortar from splashing when pouring mortar), and pouring the mortar to be flush with the pile top surface of the open prestressed high-strength concrete pipe pile 5;
(12) cutting the concrete along the top surface by using iron wire scissors after curing for 24 hours, removing the plastic film at the top of the GFRP anti-floating anchor rod body 4, installing the expansion head 6, screwing the expansion head onto the GFRP anti-floating anchor rod body 4, and ensuring that the GFRP anti-floating anchor rod body 4 is flush with the upper surface of the expansion head; after the installation is finished, the cushion layer 9 and the foundation slab 10 are constructed according to the construction drawing and the requirements of relevant specifications.
Claims (4)
1. An integrated anti-floating device of an open prestressed high-strength concrete pipe pile and an anti-floating anchor rod is characterized in that a main body structure comprises a GFRP anti-floating anchor rod body positioner, a fixed support, a centering bracket, a GFRP anti-floating anchor rod body, an open prestressed high-strength concrete pipe pile, an expansion head, an inverted L-shaped reinforcing steel bar, a circular steel plate, a cushion layer and a base plate; one end of the GFRP anti-floating anchor rod body positioner is bound on the GFRP anti-floating anchor rod body, and the other end of the GFRP anti-floating anchor rod body positioner is bound at a reserved hole of an annular steel plate in the fixed support, so that the centered GFRP anti-floating anchor rod body is prevented from sliding downwards, and the anchoring length is ensured to meet the design requirement; the fixed support is arranged on a flat ground to ensure the stability of the fixed support; the centering bracket is arranged on the GFRP anti-floating anchor rod body and is connected with the open prestressed high-strength concrete pipe pile, so that the GFRP anti-floating anchor rod body is ensured to be positioned on the central line of the aperture of the open prestressed high-strength concrete pipe pile; the GFRP anti-floating anchor rod body is a full-thread glass fiber reinforced polymer solid anchor rod, and the anchoring length and diameter of the GFRP anti-floating anchor rod body are determined according to the anchoring force; the expansion head is made of glass fiber reinforced polymer materials, a circular hole is reserved in the center of the expansion head, threads are formed on the inner wall of the hole, the size of the hole is determined according to the diameter of the GFRP anti-floating anchor rod body, the diameter of the outer contour of the expansion head is 5 times of the diameter of the reserved circular hole, the expansion head is installed on the outer surface of the top end of the GFRP anti-floating anchor rod body in a thread coupling mode and is poured in a base bottom plate, and epoxy resin and EP type curing agent mixed liquid with the mass ratio of 2:1 is injected at the thread coupling position of the expansion head and the GFRP anti-floating anchor rod body, so that on one hand, the stress area of an anchoring end is increased, the stress; the inverted L-shaped steel bar is made of smooth steel bars with the diameter of 8mm, and the length of the inverted L-shaped steel bar is determined according to the anchoring length; the thickness of the circular steel plate is 4mm, the diameter of the circular steel plate is smaller than the inner diameter of the prestressed high-strength concrete pipe pile, and the circular steel plate is just placed in the open prestressed high-strength concrete pipe pile; the inverted L-shaped steel bars are welded with the round steel plates and are uniformly distributed at the edges of the round steel plates at included angles of 120 degrees, so that the anchor mortar is prevented from being injected into the whole pile length range of the open prestressed high-strength concrete pipe pile, and only the anchor mortar is injected into the anchor depth range determined by the anchor force, and the purposes of saving materials and reducing the manufacturing cost are achieved; the cushion layer is made of C15 fine stone concrete, the cushion layer is laid on the ground, the top surface of the cushion layer is leveled, the surface of the cushion layer is smooth, steel bars can be conveniently bound on the surface of the cushion layer, and the cushion layer also plays a role in protecting the foundation slab; the foundation slab is made of reinforced concrete, constructed according to the construction drawing and the requirements of the design standard of foundation of building foundation (GB 50007-2011) and arranged on the cushion layer, and the anchoring length of the GFRP anti-floating anchor rod body in the foundation slab is determined by the anchoring force.
2. The integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod according to claim 1, wherein the GFRP anti-floating anchor rod body positioner is made of iron wire, has the specification of 18#, has the diameter of 1.6mm, and has the length determined according to the anchoring length of the anti-floating anchor rod.
3. The integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod according to claim 1, wherein the fixing support is formed by welding a seamless steel pipe and an annular steel plate, the height of the seamless steel pipe is adjusted by the height of the open prestressed high-strength concrete pipe pile exposed out of the ground, the height of the seamless steel pipe is at least 10cm higher than the top surface of the prestressed high-strength concrete pipe pile, the diameter of the seamless steel pipe is 10cm larger than the pile diameter of the prestressed high-strength concrete pipe pile, the width of the annular steel plate is 8cm, symmetrical holes are reserved in the annular steel plate, and the size of the hole enables the GFRP anti-floating anchor rod body positioner to pass through the opening for fixing the GFRP anti-floating anchor rod body positioner, so as to prevent the GFRP anti-floating anchor rod body.
4. The integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod according to claim 1, wherein the centering bracket is composed of a bolt, a nut, a steel lamella, a first steel sheet, a steel sleeve, a second steel sheet, a trapezoidal steel sheet, a wire rod, a seamless steel pipe with an inner mantle fiber and a stiffening rib steel sheet, wherein the steel lamella is formed by uniformly dividing the seamless steel pipe according to 90 degrees, the diameter of the steel lamella is determined according to the diameter of the GFRP anti-floating anchor rod body, the first steel sheet is welded at two ends of the steel lamella, a hole is reserved at the centroid position of the first steel sheet, the size of the hole enables the bolt to pass through, the adjacent steel lamellas are coupled and connected together through the bolt and the nut, and the holding power of the steel lamella and the GFRP anti-floating anchor rod body is improved by screwing the bolt and the; a steel sleeve is welded on an axial symmetry line of each steel clack along the outer surface of the steel clack, the steel sleeve is made of a seamless steel pipe, the thickness of the steel sleeve is 2mm, the diameter of the steel sleeve is 2.5cm, the length of the steel sleeve is determined according to the inner diameter of the open prestressed high-strength concrete pipe pile, the length of a wire rod in the steel sleeve is two times of the length of the steel sleeve, so that the length of the wire rod is determined, the wire rod is a solid iron rod with the diameter of 2cm, the surface of the wire rod is provided with threads, the side length of a second steel sheet is 5cm, the thickness of the second steel sheet is 2mm, one end of the wire rod is installed in the steel sleeve, the other end of the wire rod is welded to the shape center of the second steel sheet, the stress area of the inner wall of the open prestressed high-strength concrete pipe pile is increased, the overall stability is improved, the diameter of an inner wire rod seamless steel pipe is determined according to the diameter, the thickness is 2mm, trapezoidal steel sheet welding is at the outer wall of inner mantle fiber seamless steel pipe, weld the stiffening rib steel sheet between inner mantle fiber seamless steel pipe and the trapezoidal steel sheet, the shape of stiffening rib steel sheet is triangle-shaped, thickness is 2mm, the length of side of two right-angle sides is 3cm, be used for strengthening trapezoidal steel sheet and the intensity and the stability of inner mantle fiber seamless steel pipe, adjust the inner mantle fiber seamless steel pipe on the excellent when installation centering support, make the GFRP anti-floating stock body of rod be in the centre line of open prestressing force high strength concrete pipe pile aperture, and through adjusting inner mantle fiber seamless steel pipe make the second steel sheet hug closely on the inner wall of prestressing force high strength concrete pipe pile.
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| CN201810524694.7A CN108677945B (en) | 2018-05-28 | 2018-05-28 | Integrated anti-floating device of open prestressed high-strength concrete pipe pile and anti-floating anchor rod |
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| CN113585361B (en) * | 2021-09-06 | 2023-04-07 | 青岛理工大学 | Horizontal sliding support, anti-floating anchor rod and construction method |
| CN114032862B (en) * | 2021-11-03 | 2022-12-13 | 中铁二局集团建筑有限公司 | Water surface garbage collecting device for utilizing water flow traction force |
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| KR101737360B1 (en) * | 2015-07-31 | 2017-05-18 | 주식회사 파일웍스 | Foldable apparatus for head reinforcement of PHC pile |
| CN105350584B (en) * | 2015-11-10 | 2017-10-17 | 中建三局第一建设工程有限责任公司 | A kind of construction method of anti-float anchor rod |
| CN105951826B (en) * | 2016-05-04 | 2017-11-03 | 太原理工大学 | A kind of pile tube inner suction ground anchorage and its hydraulic pressure injection method |
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