CN108560613A - Integrated anti-floating method for open prestressed high-strength concrete pipe pile and anti-floating anchor rod - Google Patents

Abstract

The invention belongs to the technical field of foundation engineering, and relates to an integrated anti-floating method of an exposed prestressed high-strength concrete pipe pile and an anti-floating anchor rod, using non-metallic materials with good corrosion resistance and high tensile strength as the anti-floating method. Anchor rod body, and the anti-floating anchor rod is connected with the prestressed high-strength concrete pipe pile, so that the prestressed high-strength concrete pipe pile and the anti-floating anchor rod are connected as one, which reduces the construction process, shortens the construction period, reduces the cost, and realizes the prestressed high-strength concrete pipe pile. Stressed high-strength concrete pipe piles can resist both vertical pressure and groundwater buoyancy.

Description

An integrated anti-floating method of exposed prestressed high-strength concrete pipe piles and anti-floating anchor rods

Technical field:

The invention belongs to the technical field of foundation engineering, and relates to an integrated anti-floating method of a composite material anti-floating anchor rod and a prestressed high-strength concrete pipe pile, in particular to an open prestressed high-strength concrete pipe pile and an anti-floating anchor Rod integrated anti-floating method.

Background technique:

Prestressed high-strength concrete pipe piles are characterized by industrial-scale production, easy quality control and inspection, higher quality of pile sinking than cast-in-place piles, high bearing capacity of single piles, strong adaptability to engineering geological conditions, short construction period, and easy construction on site. With the advantages of no pollution, it has been widely used in civil engineering fields such as industrial and civil buildings, highway bridges, ports, etc., and has become one of the most widely used pile types in my country. Especially the prestressed high-strength concrete pipe piles constructed by the static pressure method are in line with the development direction of green assembly.

However, with the utilization of underground space and the continuous increase of the buried depth of building foundations, the problem of anti-floating also arises. However, the pressure pile itself cannot resist the damage caused by groundwater buoyancy, so it is very important to choose appropriate anti-floating measures. Compared with the anti-floating measures such as the drainage method, the ballast method, and the anti-lift pile, the anti-floating anchor rod has the advantages of strong stratum adaptability, distributed stress, convenient construction, and cost saving, and has been widely used in the field of civil engineering. At present, the material of anti-floating anchors is mainly steel bars, and the environment of anti-floating anchors is relatively poor. It is underwater or in alternating dry and wet areas all the year round. Chloride ions in groundwater make steel anchors suffer from chemical corrosion. . Especially in the construction of urban rail transit, the stray current generated causes the steel anchor to suffer electrochemical corrosion at the same time, which greatly reduces the service life of the anti-floating anchor. Therefore, the anti-corrosion problem of the anchor structure is more prominent, but the current anchor The anti-corrosion problem has not yet been fundamentally broken through. In this case, the use of non-metallic material anchors has become the best choice. GFRP (Glass Fiber Reinforced Polymer) material is made of glass fiber as a reinforcing material and synthetic resin as a matrix material. After fiber yarn is impregnated with resin glue such as unsaturated polyester resin and various additives such as curing agent and accelerator, A composite material formed by pultrusion, thread winding, and solidification at one time. GFRP anchor has the advantages of high tensile strength, light weight, corrosion resistance, strong anti-electromagnetic interference, and low cost. In recent years, it has been used on slopes. There are many researches and applications in reinforcement, foundation pit support and other fields.

At present, urban construction is in full swing, and the use of anti-floating anchors is increasing. The application of GFRP anti-floating anchors is conducive to reducing project costs and building safety projects. It is an urgent and meaningful work. Now the combination of prestressed high-strength concrete pipe piles and GFRP anti-floating anchors can compensate for the vertical compressive bearing capacity of prestressed high-strength concrete pipe piles and save costs; No drilling is required, the entry and exit of large equipment is avoided, and the construction cost is also reduced. It can be seen that the economic benefits are very significant. Therefore, it is imminent to design a reasonable and reliable integrated anti-floating method of prestressed high-strength concrete pipe piles and composite material anti-floating anchors, which has broad application prospects and good economic benefits.

Invention content:

The purpose of the present invention is to overcome the shortcomings of the prior art, and provide an integrated anti-floating method for open prestressed high-strength concrete pipe piles and anti-floating anchor rods without increasing the cost, and improve the anti-corrosion performance. Good, high tensile strength non-metallic material is used as the anti-floating anchor rod body, and the anti-floating anchor rod is connected with the prestressed high-strength concrete pipe pile, so that the prestressed high-strength concrete pipe pile and the anti-floating anchor rod are integrated , reduce the construction process, shorten the construction period, reduce the cost, and realize the goal that the prestressed high-strength concrete pipe pile can resist both vertical pressure and groundwater buoyancy.

In order to achieve the above object, the present invention is realized in the integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod, and the specific process is as follows:

(1) First drive or static pressure exposed prestressed high-strength concrete pipe piles, clean and smooth the inner wall of the exposed prestressed high-strength concrete pipe piles, and level the ground around the piles;

(2) Evenly weld three inverted L-shaped steel bars to the edge of the circular steel plate at an angle of 120°, and install them on the top surface of the open prestressed high-strength concrete pipe pile to ensure the stability of the GFRP anti-floating anchor rod body The distance between the bottom end and the upper surface of the circular steel plate is not less than 50cm;

(3) Weld the seamless steel pipe and the ring-shaped steel plate together to form a fixed support, and reserve holes symmetrically on the ring-shaped steel plate. The size of the hole can ensure that the iron wire can pass through; then install the fixed support and ensure the fixed support 5cm into the soil to make it stable;

(4) Reserve a hole at the centroid of the first steel sheet, the size of the hole is enough to ensure that the bolt passes through; and weld the first steel sheet to both ends of the steel flap, and then on the arc bisector of each steel flap Welded steel casing, the direction is outward, and the four steel petals are coupled together by bolts and nuts;

(5) The wire rod is tightly welded to the centroid of the second steel sheet to ensure that the wire rod is perpendicular to the upper surface of the second steel sheet;

(6) The trapezoidal steel sheet is tightly connected to the outer wall of the inner sleeve seamless steel pipe by welding to ensure that the upper surface of the trapezoidal steel sheet is perpendicular to the inner sleeve seamless steel pipe, and the gap between the inner sleeve seamless steel pipe and the trapezoidal steel sheet Welded stiffener steel sheet between;

(7) Fix the steel flap on the GFRP anti-floating anchor rod body, tighten the bolts and nuts to increase the gripping force of the steel flap and the GFRP anti-floating anchor rod body, and install two sets of steel flaps according to the anchorage length, two of which The distance between the steel flaps is determined according to the anchoring length of the GFRP anti-floating anchor rod body, and then two iron wires are tied on the GFRP anti-floating anchor rod body in the middle of the two sets of steel flaps, and the tightening is guaranteed to prevent sliding;

(8) Connect the inner threaded seamless steel pipe and the wire rod together through thread coupling, and adjust the inner threaded seamless steel pipe according to the inner diameter of the exposed prestressed high-strength concrete pipe pile to ensure the adjustment of the inner threaded seamless steel pipe The length ratio of the upper end and the lower end of the wire rod is 2:1;

(9) Insert the wire rod into the steel casing, and adjust the inner threaded seamless steel pipe on the wire rod so that the GFRP anti-floating anchor rod body is located on the central axis of the inner diameter of the open prestressed high-strength concrete pipe pile, and ensure that The second steel sheet is closely attached to the inner wall of the open prestressed high-strength concrete pipe pile, and finally the length of the fixed GFRP anti-floating anchor rod body in the open prestressed high-strength concrete pipe pile is the anchor length design value, and ensures that the GFRP anti-floating anchor rod The thickness of the protective layer between the lower end of the floating anchor rod body and the circular steel plate is not less than 20cm;

(10) Fix the two iron wires on the GFRP anti-floating anchor body to the two reserved holes on the fixed support, and ensure that each iron wire is tightened and tightened to prevent the GFRP anti-floating anchor body from sliding down ;

(11) Seal the upper end of the GFRP anti-floating anchor rod body with a plastic film (to prevent the mortar from being splashed when pouring the mortar), and pour the mortar flush with the top surface of the exposed prestressed high-strength concrete pipe pile;

(12) After curing for 24 hours, use iron wire shears to cut along the top surface of the concrete, remove the plastic film on the top of the GFRP anti-floating anchor rod body 4, install the expansion head, and tighten it to the GFRP anti-floating anchor rod body to ensure that the GFRP The body of the anti-floating anchor rod is flush with the upper surface of the expansion head; after installation, the cushion and foundation floor shall be constructed according to the requirements of the construction drawings and relevant specifications.

The main structure of the integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor of the present invention includes a GFRP anti-floating anchor rod body positioner, a fixed support, a centering bracket, and a GFRP anti-floating anchor Rod body, open prestressed high-strength concrete pipe pile, enlarged head, inverted L-shaped steel bar, circular steel plate, cushion, foundation floor; one end of the GFRP anti-floating anchor rod body locator is tied to the GFRP anti-floating anchor rod body, The other end is tied to the reserved hole of the ring-shaped steel plate in the fixed support to prevent the centered GFRP anti-floating anchor rod body from sliding down to ensure that the anchorage length meets the design requirements; the fixed support is installed on a flat ground to ensure Its stability; the centering bracket is installed on the GFRP anti-floating anchor rod body and connected with the open prestressed high-strength concrete pipe pile to ensure that the GFRP anti-floating anchor rod body is in the center line of the aperture of the open prestressed high-strength concrete pipe pile Above; the GFRP anti-floating anchor rod body is a solid anchor rod with full thread glass fiber reinforced polymer, and its anchoring length and diameter are determined according to the anchoring force; the material of the expansion head is glass fiber reinforced polymer material (the same as the GFRP anti-floating anchor rod body The material is the same), a round hole is reserved in the center, and the inner wall of the hole is threaded. The size of the hole is determined according to the diameter of the GFRP anti-floating anchor rod. The coupling method is installed on the outer surface of the top of the GFRP anti-floating anchor body and poured into the base plate. The threaded coupling between the expansion head and the GFRP anti-floating anchor body is filled with epoxy resin and EP type with a mass ratio of 2:1. The curing agent mixture, on the one hand, is used to increase the force-bearing area of the anchorage end, spread the stress, and improve the anchoring force, and on the other hand, it can achieve the purpose of water-stopping; the inverted L-shaped steel bar is made of a smooth round steel bar with a diameter of 8mm. Its length is determined according to the anchorage length; the thickness of the circular steel plate is 4mm, and its diameter is slightly smaller than the inner diameter of the prestressed high-strength concrete pipe pile, and the circular steel plate is just placed inside the open prestressed high-strength concrete pipe pile; inverted L-shaped The reinforced circular steel plate is welded and evenly distributed at the edge of the circular steel plate at an angle of 120°, avoiding the injection of anchor mortar within the entire pile length of the open prestressed high-strength concrete pipe pile, and only in the anchorage determined by the anchoring force Anchor mortar is injected within the depth range to achieve the purpose of saving materials and reducing cost; the cushion is made of C15 fine stone concrete, and the cushion is laid on the ground, and the top surface is smoothed to make the surface flat and easy to bind steel bars on it , also plays the role of protecting the foundation floor; the foundation floor is made of reinforced concrete, and is constructed and placed on the cushion according to the construction drawings and the requirements of the "Code for Design of Building Foundations" (GB50007-2011), and the GFRP anti-floating anchor rod The length of the rod body anchored into the base plate is determined by the anchoring force.

The GFRP anti-floating anchor rod body locator of the present invention is made of iron wire, the specification is 18#, and the diameter is 1.6mm, and its length is determined according to the anchoring length of the anti-floating anchor rod.

The fixed support of the present invention is welded by a seamless steel pipe and an annular steel plate, and the height of the seamless steel pipe is adjusted by the exposed height of the exposed prestressed high-strength concrete pipe pile, which is higher than the top of the prestressed high-strength concrete pipe pile The upper surface is at least 10cm, and its diameter is 10cm larger than the diameter of the prestressed high-strength concrete pipe pile. The width of the annular steel plate is 8cm, and symmetrical holes are reserved on the annular steel plate. However, it is used to fix the GFRP anti-floating anchor rod body positioner, thereby preventing the GFRP anti-floating anchor rod body from sliding up and down.

The centering support of the present invention is composed of bolts, nuts, steel flaps, first steel sheets, steel sleeves, second steel sheets, trapezoidal steel sheets, wire rods, seamless steel pipes with inner sleeves, and stiffener steel sheets. Among them, the steel flap is made of seamless steel pipe evenly divided at 90°, and its diameter is determined according to the diameter of the GFRP anti-floating anchor rod body. Both ends of the steel flap are welded with the first steel sheet, and the center of the first steel sheet The hole is reserved in the position, and the size of the hole can allow the bolt to pass through, and the adjacent steel flaps are coupled together by bolts and nuts, and the grip force between the steel flap and the GFRP anti-floating anchor rod body is improved by tightening the bolts and nuts; each Steel casings are welded along the outer surface of the steel flaps on the axisymmetric line of the steel flaps. The steel casings are made of seamless steel pipes with a thickness of 2mm and a diameter of 2.5cm. Determine the inner diameter, and ensure that the length of the wire rod in the steel sleeve is twice the length outside the steel sleeve, so as to determine the length of the wire rod. The wire rod is a solid iron rod with a diameter of 2 cm and has threads on the surface. The second The side length of the steel sheet is 5cm, and the thickness is 2mm. One end of the wire rod is installed in the steel casing, and the other end is welded to the centroid of the second steel sheet, which is used to increase the inner wall of the open prestressed high-strength concrete pipe pile. Stress area, improve the overall stability, the diameter of the inner sleeve seamless steel pipe is determined according to the diameter of the wire rod, the inner sleeve seamless steel pipe and the wire rod are connected by thread coupling, the length is 3cm, and the height of the trapezoidal steel sheet is 5cm, thickness 2mm, the trapezoidal steel sheet is welded to the outer wall of the inner sleeve seamless steel pipe, and the stiffener steel sheet is welded between the inner sleeve seamless steel pipe and the trapezoidal steel sheet, the shape of the stiffener steel sheet is triangular, and the thickness is 2mm , the length of the two right-angled sides is 3cm, which is used to enhance the strength and stability of the trapezoidal steel sheet and the inner threaded seamless steel pipe. When installing the centering bracket, adjust the inner threaded seamless steel pipe on the wire rod to make GFRP resistant The floating anchor rod body is located on the center line of the aperture of the open prestressed high-strength concrete pipe pile, and the second steel sheet is closely attached to the inner wall of the prestressed high-strength concrete pipe pile by adjusting the inner threaded seamless steel pipe.

Compared with the prior art, the open prestressed high-strength concrete pipe pile can not only withstand the pressure but also resist the buoyancy of the groundwater, which integrates the compression resistance and the anti-floating set, thereby reducing the construction of the anti-floating anchor rod alone process, there is no need for large-scale equipment such as bolters to enter the site, which can shorten the construction period, and the exposed prestressed high-strength concrete pipe piles are prefabricated piles (fabricated foundations), which are convenient for construction and can withstand both pressure and anti-floating. Based on this, the size (including pile diameter and pile length) of the original open prestressed high-strength concrete pipe pile can be further improved. Optimization, so as to achieve the purpose of saving materials, reducing energy consumption, and saving project cost. It has simple structure, quick and easy installation, strong operability, energy saving and environmental protection, significant economic and social benefits, and reduces the construction of separate anti-floating anchor rods. The process shortens the construction period, reduces the cost, and can obtain higher and more reliable pull-out resistance.

Description of the drawings:

Fig. 1 is a schematic diagram of the main structure of the anti-floating device integrated with the open prestressed high-strength concrete pipe pile and the anti-floating anchor according to the present invention.

Figure 2 is a schematic diagram of the centering bracket of the present invention.

Fig. 3 is a diagram of the relative positions of the trapezoidal steel sheet, the seamless steel pipe with the inner sleeve, and the stiffener steel sheet according to the present invention.

Fig. 4 is an A-A sectional view of Fig. 3 of the present invention.

Fig. 5 is a schematic diagram of the structural principle of the expanding head of the present invention.

Fig. 6 is a top view of the enlarging head of the present invention.

Fig. 7 is a top view of the fixing support of the present invention.

Fig. 8 is a B-B sectional view of the fixed support shown in Fig. 7 of the present invention.

Fig. 9 is a relative position diagram of the inverted L-shaped steel bar 7 and the circular steel plate 8 according to the present invention.

Figure 10 is a C-C sectional view of Figure 9

Fig. 11 is a schematic diagram of the structural principle of the inverted L-shaped steel bar 7 of the present invention.

Detailed ways:

The present invention will be described in further detail below through the embodiments and in conjunction with the accompanying drawings.

Example:

This embodiment is realized in the integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor rod, and the specific process is as follows:

(1) First drive or static pressure the exposed prestressed high-strength concrete pipe pile 5, clean the inner wall of the exposed prestressed high-strength concrete pipe pile 5 smooth and clean, and level the ground around the pile;

(2) Evenly weld three inverted L-shaped steel bars 7 to the edge of the circular steel plate 8 at an angle of 120°, and install them on the top surface of the open prestressed high-strength concrete pipe pile 5 to ensure GFRP anti-floating anchor The distance between the bottom end of the rod body 4 and the upper surface of the circular steel plate 8 is not less than 50cm;

(3) weld the seamless steel pipe 2-1 and the annular steel plate 2-2 together to form the fixed support 2, and reserve holes symmetrically on the annular steel plate 2-2, and the size of the hole can ensure that the iron wire passes through; then Install the fixed support 2, and ensure that the lower end of the fixed support 2 is buried 5cm into the soil to make it stable;

(4) Reserve a hole at the centroid of the first steel sheet 3-4, and the size of the hole can ensure that the bolt 3-1 passes through; and weld the first steel sheet 3-4 to both ends of the steel flap 3-3 , and then weld the steel casing 3-5 on the arc bisector of each steel flap 3-3, the direction is outward, and couple the four steel flaps 3-3 together through bolts and nuts;

(5) The wire rod 3-8 is tightly welded to the centroid of the second steel sheet 3-6, ensuring that the wire rod 3-8 is perpendicular to the upper surface of the second steel sheet 3-6;

(6) The trapezoidal steel sheet 3-7 is tightly connected to the outer wall of the inner sleeve seamless steel pipe 3-9 by welding, ensuring that the upper surface of the trapezoidal steel sheet 3-7 is perpendicular to the inner sleeve seamless steel pipe 3-9, And weld the stiffener steel sheet 3-10 between the inner sleeve seamless steel pipe 3-9 and the trapezoidal steel sheet 3-7;

(7) Fix the steel flap 3-3 on the GFRP anti-floating anchor rod body 4, and increase the gripping force of the steel flap 3-3 and the GFRP anti-floating anchor rod body 4 by tightening the bolt 3-1 and the nut 3-2 , and install two sets of steel flaps according to the anchorage length, wherein the distance between the two sets of steel flaps is determined according to the anchorage length of the GFRP anti-floating anchor rod body 4, and then on the GFRP anti-floating anchor rod body 4 at the middle position of the two sets of steel flaps Bind the two iron wires and ensure that they are tightened so that they cannot slide;

(8) The inner threaded seamless steel pipe 3-9 and the wire rod 3-8 are coupled together by threads, and the inner threaded seamless steel pipe 3- 9. Ensure that the length ratio of the upper end and the lower end wire rod 3-8 of the inner sleeve seamless steel pipe 3-9 is adjusted to be 2:1;

(9) Insert the wire rod 3-8 into the steel casing 3-5, and adjust the inner threaded seamless steel pipe 3-9 on the wire rod 3-8 so that the GFRP anti-floating anchor rod body is located in the open prestressed On the central axis of the inner diameter of the high-strength concrete pipe pile 5, and ensure that the second steel sheet 3-6 is close to the inner wall of the open prestressed high-strength concrete pipe pile 5, and finally fix the GFRP anti-floating anchor rod body in the open prestressed The length in the high-strength concrete pipe pile 5 is the design value of the anchorage length, and the thickness of the protective layer between the lower end of the GFRP anti-floating anchor rod body 4 and the circular steel plate 8 is not less than 20cm;

(10) Fix the two iron wires on the GFRP anti-floating anchor body 4 to the two reserved holes of the fixed support, and ensure that each iron wire is tightened and tightened to avoid the 4-way orientation of the GFRP anti-floating anchor body. slide down;

(11) seal the upper end of the GFRP anti-floating anchor rod body 4 with a plastic film (when preventing pouring mortar from being splashed with mortar), pouring mortar is flush with the top surface of 5 piles of exposed prestressed high-strength concrete pipe piles;

(12) After curing for 24 hours, use iron wire shears to cut along the concrete top surface, remove the plastic film on the top of the GFRP anti-floating anchor rod body 4, install the expansion head 6, and tighten it to the GFRP anti-floating anchor rod body 4, Ensure that the GFRP anti-floating anchor rod body 4 is flush with the upper surface of the expansion head; after installation, construct the cushion layer 9 and the foundation floor 10 according to the requirements of the construction drawings and relevant specifications.

The main structure of the integrated anti-floating device of the open prestressed high-strength concrete pipe pile and the anti-floating anchor in this embodiment includes a GFRP anti-floating anchor rod body positioner 1, a fixed support 2, a centering bracket 3, and a GFRP Anti-floating anchor rod body 4, open prestressed high-strength concrete pipe pile 5, enlarged head 6, inverted L-shaped steel bar 7, circular steel plate 8, cushion layer 9, foundation bottom plate 10; GFRP anti-floating anchor rod body positioner 1 One end of the GFRP anti-floating anchor rod body 4 is tied, and the other end is tied to the reserved hole of the annular steel plate 2-2 in the fixed support 2, so as to prevent the centered GFRP anti-floating anchor rod body 4 from sliding downward, ensuring The anchorage length meets the design requirements; the fixed support 2 is installed on a flat ground to ensure its stability; the centering support 3 is installed on the GFRP anti-floating anchor rod body 4 and connected with the open prestressed high-strength concrete pipe pile 5 , to ensure that the GFRP anti-floating anchor body 4 is on the centerline of the aperture of the open prestressed high-strength concrete pipe pile 5; Determined according to the anchoring force; the material of the expansion head 6 is glass fiber reinforced polymer material (the same material as the GFRP anti-floating anchor rod body 4), a round hole is reserved in the center, and the inner wall of the hole is threaded. The diameter of the floating anchor body 4 is determined, and the outer contour diameter of the expansion head 6 is 5 times the diameter of the reserved round hole. The expansion head 6 is installed on the outer surface of the top of the GFRP anti-floating anchor body 4 in a threaded coupling manner and poured on the foundation In the bottom plate 10, the threaded joint between the expansion head 6 and the GFRP anti-floating anchor rod body 4 is injected with a mixture of epoxy resin and EP curing agent with a mass ratio of 2:1, on the one hand, it is used to increase the force bearing area of the anchoring end , spread the stress, improve the effect of the anchoring force, and on the other hand can realize the purpose of water-stopping; the inverted L-shaped steel bar 7 is made of a smooth round steel bar with a diameter of 8 mm, and its length is determined according to the anchoring length; the thickness of the circular steel plate 8 is 4mm, its diameter is slightly smaller than the inner diameter of the prestressed high-strength concrete pipe pile 5, and the circular steel plate 8 is just placed inside the open prestressed high-strength concrete pipe pile 5; the inverted L-shaped steel bar 7 is welded with the circular steel plate 8, and The included angle of 120° is evenly distributed on the edge of the circular steel plate 8, avoiding the injection of anchoring mortar within the entire pile length of the open prestressed high-strength concrete pipe pile 5, and only injecting the anchoring mortar within the anchoring depth determined by the anchoring force , to achieve the purpose of saving materials and reducing cost; the cushion layer 9 is made of C15 fine stone concrete, and the cushion layer 9 is laid on the ground, and its top surface is smoothed to make the surface flat and easy to bind steel bars on it, and also play a role The role of protecting the foundation bottom plate 10; the foundation bottom plate 10 is made of reinforced concrete, and is constructed in accordance with the requirements of the construction drawings and the "Code for Design of Building Foundations" (GB50007-2011) and set on the cushion 9, and the GFRP anti-floating anchor rod body 4 The length of anchoring into the base plate 10 is determined by the anchoring force.

The GFRP anti-floating anchor body positioner 1 described in this embodiment is made of iron wire with a specification of 18# and a diameter of 1.6mm, and its length is determined according to the anchoring length of the anti-floating anchor.

The fixed support 2 described in this embodiment is welded by a seamless steel pipe 2-1 and an annular steel plate 2-2, and the height of the seamless steel pipe 2-1 is adjusted by the height of the exposed prestressed high-strength concrete pipe pile 5 exposed to the ground , which is at least 10cm higher than the top surface of the prestressed high-strength concrete pipe pile 5, its diameter 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, and the upper surface of the annular steel plate 2-2 A symmetrical hole is reserved, the size of which allows the GFRP anti-floating anchor body locator 1 to pass through, and is used to fix the GFRP anti-floating anchor body locator 1, thereby preventing the GFRP anti-floating anchor body 4 from sliding up and down.

The centering bracket 3 described in this embodiment consists of bolts 3-1, nuts 3-2, steel flaps 3-3, first steel sheets 3-4, steel sleeves 3-5, second steel sheets 3-6, trapezoidal Steel sheets 3-7, wire rods 3-8, seamless steel pipes with inner sleeves 3-9, and steel sheets with stiffening ribs 3-10, among which steel flaps 3-3 are made of seamless steel pipes evenly divided by 90° , its diameter is determined according to the diameter of the GFRP anti-floating anchor rod body 4, the first steel sheet 3-4 is welded to both ends of the steel flap 3-3, and a hole is reserved at the centroid position of the first steel sheet 3-4, The size of the hole enables the bolt 3-1 to pass through, and the adjacent steel flaps 3-3 are coupled together by the bolt 3-1 and the nut 3-2, and the steel flap is raised by tightening the bolt 3-1 and the nut 3-2. 3-3 and the gripping force of GFRP anti-floating anchor rod body 4; the steel casing 3-5 is welded along the outer surface of the steel flap 3-3 on the axisymmetric line of each steel flap 3-3, and the steel casing 3-5 Made of seamless steel pipe with a thickness of 2mm and a diameter of 2.5cm, its length is determined according to the inner diameter of the open prestressed high-strength concrete pipe pile 5, and the length of the wire rod 3-8 inside the steel casing 3-5 is guaranteed It is twice the outer length of the steel casing 3-5, thereby determining the length of the wire rod 3-8, the wire rod 3-8 is a solid iron rod with a diameter of 2cm, and the surface is threaded, and the second steel sheet 3- The side length of 6 is 5cm, and thickness is 2mm, and one end of wire rod 3-8 is installed in the steel casing 3-5, and the other end is welded on the centroid of the second steel sheet 3-6, is used for increasing opening The stress-bearing area of the inner wall of the prestressed high-strength concrete pipe pile 5 improves the overall stability. The diameter of the inner threaded seamless steel pipe 3-9 is determined according to the diameter of the wire rod 3-8, and the inner threaded seamless steel pipe 3-9 and The wire rod 3-8 is connected by thread coupling, and its length is 3cm. The height of the trapezoidal steel sheet 3-7 is 5cm, and the thickness is 2mm. The trapezoidal steel sheet 3-7 is welded to the outer wall of the inner sleeve seamless steel pipe 3-9 , the stiffener steel sheet 3-10 is welded between the inner sleeve seamless steel pipe 3-9 and the trapezoidal steel sheet 3-7, the shape of the stiffener steel sheet 3-10 is triangular, the thickness is 2mm, and the side length of two right-angled sides Both are 3cm, used to strengthen the strength and stability of the trapezoidal steel sheet 3-7 and the inner threaded seamless steel pipe 3-9, adjust the inner threaded seamless steel pipe 3 on the wire rod 3-8 when the centering support 3 is installed -9, make the GFRP anti-floating anchor rod body 4 on the center line of the aperture of the open prestressed high-strength concrete pipe pile 5, and make the second steel sheet 3-6 close to it by adjusting the inner threaded seamless steel pipe 3-9 On the inner wall of the prestressed high-strength concrete pipe pile 5.

Claims (5)

1. a kind of opening prestressed high strength coagulation pile pile anti-float method integrated with anti-float anchor rod, it is characterised in that open pre- It is realized in stress high intensity coagulation pile pile anti-floating system integrated with anti-float anchor rod, detailed process is：

(1) it first squeezes into or static pressure opening PHC piles, by open PHC piles Inner wall cleaning is smooth, clean, and stake week ground is flattened；

(2) by three inverted L-shaped reinforcing bars with 120 ° of angle uniform welding to the edge of circular steel plate, and attach it to opening PHC piles top surface, it is ensured that distance of the bottom end of the GFRP anti-float anchor rod bodies of rod apart from circular steel plate upper surface No less than 50cm；

(3) seamless steel pipe and doughnut-shaped steel plate are welded together into composition hold-down support, and the symmetrical preformed hole on doughnut-shaped steel plate Hole, hole size can guarantee across iron wire；Then hold-down support is installed, and ensure that the lower end of the hold-down support 5cm that buries makes It is firm；

(4) reserving hole at the centre of form of the first steel disc, hole size ensure that bolt passes through；And the first steel disc is welded to Then rigid casing is welded in the both ends of steel valve on the arc bisector of each steel valve, direction is outside, and by screw bolt and nut by four A steel valve is of coupled connections together；

(5) silk stick is closely welded at the centre of form of the second steel disc, ensures that silk stick and the second steel disc upper surface are vertical；

(6) trapezoidal steel disc is close-coupled to the outer wall of interior mantle fiber seamless steel pipe in a welding manner, ensures trapezoidal steel disc upper table Face is vertical with interior mantle fiber seamless steel pipe, and ribbed stiffener steel disc is welded between interior mantle fiber seamless steel pipe and trapezoidal steel disc；

(7) steel valve is fixed on the GFRP anti-float anchor rod bodies of rod, steel valve and GFRP anti-floatings is improved by tightening screw bolt and nut The bond stress of anchor rod body, and two sets of steel valves are installed according to anchorage length, wherein the spacing between two sets of steel valves is anti-according to GFRP The anchorage length of drogue club shaft determines, two are then bound on the GFRP anti-float anchor rod bodies of rod in two sets of steel valve centre positions Iron wire, and ensure to tighten and cannot slide；

(8) interior mantle fiber seamless steel pipe and silk stick are linked together by screw thread couple, and mixed according to open prestressed high strength The inner diameter size of solidifying soil pile pile adjusts interior mantle fiber seamless steel pipe, it is ensured that the top and bottom silk stick of mantle fiber seamless steel pipe in adjusting Length ratio is 2:1；

(9) silk stick is inserted into steel sleeve, by adjusting the interior mantle fiber seamless steel pipe on silk stick, makes GFRP anti-float anchor rod bodies of rod position In on the central axes of open PHC piles internal diameter, and ensure that the second steel disc is tightly attached to open prestressed high-strength It spends on concrete tubular pile inner wall, length of the final fixed GFRP anti-float anchor rods body of rod in open PHC piles Degree is anchorage length design value, and ensures that the protective layer thickness between the lower end and circular steel plate of the GFRP anti-float anchor rod bodies of rod is not small In 20cm；

(10) two iron wires on the GFRP anti-float anchor rod bodies of rod are fixed on two reserving holes of hold-down support, and ensured every Root iron wire will be tightened, be tensed, and GFRP anti-float anchor rod body of rod slide downwards are avoided；

(11) upper end of the GFRP anti-float anchor rod bodies of rod is sealed and (when preventing from pouring mortar, splashes mortar) with plastic film, poured Mortar is simultaneously flushed with open PHC piles stake top face；

(12) it is cut along top of concrete with snips after conserving 24 hours, and by the top of the GFRP anti-float anchor rods body of rod 4 Plastic film is dismantled, and installs enlarged footing, and be tightened on the GFRP anti-float anchor rod bodies of rod, is ensured the GFRP anti-float anchor rods body of rod and is expanded Head upper surface flush；After installing, by the requirement construction cushion coat and sole plate of construction drawing and related specifications.

2. open prestressed high strength coagulation pile pile anti-float method integrated with anti-float anchor rod according to claim 1, special Sign is that the agent structure of open prestressed high strength coagulation pile pile anti-floating system integrated with anti-float anchor rod includes GFRP Anti-float anchor rod body of rod locator, hold-down support, centering holder, the GFRP anti-float anchor rods body of rod, open prestressed high strength concrete Pile pile, enlarged footing, inverted L-shaped reinforcing bar, circular steel plate, bed course, sole plate；One end of GFRP anti-float anchor rod body of rod locators is bound On the GFRP anti-float anchor rod bodies of rod, other end binding at the reserving hole of doughnut-shaped steel plate, prevents centering in hold-down support The GFRP anti-float anchor rod bodies of rod slide downwards, it is ensured that anchorage length meets design requirement；Hold-down support is mounted on smooth ground, To ensure its stability；Centering holder be mounted on the GFRP anti-float anchor rod bodies of rod on and with open PHC piles Connection, it is ensured that the GFRP anti-float anchor rod bodies of rod are on the center line in open PHC piles aperture；GFRP is anti- Drogue club shaft is the solid anchor pole of full thread glass fiber reinforced polymer, and anchorage length is determined with diameter according to anchor force； The material of enlarged footing is glass fiber reinforced polymer material (material identical with the GFRP anti-float anchor rod bodies of rod), the reserved circle in center Hole, screw thread is formed on the inner wall of aperture, and the size in aperture determines that the outer profile of enlarged footing is straight according to GFRP anti-float anchor rod shank diameters Diameter is 5 times of reserved Circularhole diameter, and enlarged footing is mounted on the appearance on GFRP anti-float anchor rod bodies of rod top in a manner of screw thread couple Face is simultaneously cast in sole plate, and it is 2 that mass ratio is marked at the screw thread couple of enlarged footing and the GFRP anti-float anchor rod bodies of rod:1 ring Oxygen resin and EP type curing agent mixed liquors, on the one hand are used to increase the forced area of anchored end, and diffusion-induced stress improves anchor force Effect, on the other hand can realize the purpose of sealing；Inverted L-shaped reinforcing bar is made of the plain bar of diameter 8mm, and length is according to anchoring Length determines；The thickness of circular steel plate is 4mm, and diameter is less than the internal diameter of PHC piles, circular steel Plate is just put into inside open PHC piles；Inverted L-shaped reinforcing bar circular steel plate is welded, and with 120 ° of angle It is uniformly distributed in the edge of circular steel plate, avoids injecting anchor in the long range of the entire stake of open PHC piles Gu mortar only injects anchorage mortar within the scope of the anchorage depth determined by anchor force, reach the mesh saved material, reduce cost 's；Bed course is made of C15 microlith element mixed muds, and on the ground, top surface smoothes out setting cushion, its surfacing is made to be convenient for upper Face assembling reinforcement also functions to the effect of protection sole plate；Sole plate is made of armored concrete, according to construction drawing and《It builds Build basic design specification of the foundation》The requirement of (GB50007-2011) is constructed and is arranged on bed course, GFRP anti-float anchor rod bars The length that body anchors into sole plate is determined by anchor force.

3. open prestressed high strength coagulation pile pile anti-float method integrated with anti-float anchor rod according to claim 2, special Sign is that the GFRP anti-float anchor rods body of rod locator is made of iron wire, and specification 18#, a diameter of 1.6mm, length is according to anti- The anchorage length of drogue bar determines.

4. open prestressed high strength coagulation pile pile anti-float method integrated with anti-float anchor rod according to claim 2, special Sign is that the hold-down support is welded by seamless steel pipe and doughnut-shaped steel plate, and the height of seamless steel pipe is by open prestressed high-strength The height that degree concrete tubular pile bassets is adjusted, and is higher by PHC piles stake top upper surface at least 10cm, Its diameter is bigger 10cm than PHC piles stake diameter, and the width of doughnut-shaped steel plate is 8cm, is reserved on doughnut-shaped steel plate pair The size of the hole of title, hole makes GFRP anti-float anchor rod body of rod locators pass through, fixed for fixing the GFRP anti-float anchor rod bodies of rod Position device, to prevent the GFRP anti-float anchor rod bodies of rod from sliding up and down.

5. open prestressed high strength coagulation pile pile anti-float method integrated with anti-float anchor rod according to claim 2, special Sign is the centering holder by bolt, nut, steel valve, the first steel disc, steel sleeve, the second steel disc, trapezoidal steel disc, silk stick, interior Seamless steel pipe, the ribbed stiffener steel disc composition of mantle fiber, wherein steel valve is made of seamless steel pipe by 90 ° of even partitions, diameter root It is determined according to the diameter of the GFRP anti-float anchor rod bodies of rod, the first steel disc is welded at the both ends of steel valve, and in the position of form center of the first steel disc Reserving hole, hole are sized so that bolt passes through, and adjacent steel valve is of coupled connections together by screw bolt and nut, is passed through Tighten the bond stress that screw bolt and nut improves steel valve and the GFRP anti-float anchor rod bodies of rod；Outside the Axisymmetric Distributed Line upper edge steel valve of each steel valve Surface soldered steel sleeve, steel sleeve are made of seamless steel pipe, thickness 2mm, a diameter of 2.5cm, and length is answered in advance according to opening The internal diameter of power high-strength concrete pipe pile determines, and ensures that length of the stick in steel sleeve is two of the length outside steel sleeve Times, so that it is determined that the length of wire vent stick, silk stick is the solid iron staff of diameter 2cm, and surface is threaded, the length of side of the second steel disc One end for 5cm, thickness 2mm, silk stick is mounted in steel sleeve, and the other end is welded in the centre of form of the second steel disc, for increasing The forced area of big open end PHC piles inner wall, improve overall stability, interior mantle fiber seamless steel pipe it is straight Diameter determines that interior mantle fiber seamless steel pipe is connect with silk stick by way of screw thread couple, the length of 3cm according to the diameter of silk stick, Trapezoidal steel disc height is 5cm, and thickness 2mm, trapezoidal steel disc is welded on the outer wall of interior mantle fiber seamless steel pipe, in interior mantle fiber seamless steel Ribbed stiffener steel disc is welded between pipe and trapezoidal steel disc, ribbed stiffener steel disc shape is triangle, thickness 2mm, the side of two right-angle sides Length is 3cm, the strength and stability for enhancing trapezoidal steel disc and interior mantle fiber seamless steel pipe, and silk is adjusted when installing centering holder Interior mantle fiber seamless steel pipe on stick makes the GFRP anti-float anchor rod bodies of rod be in open PHC piles aperture On heart line, and the second steel disc is set to be tightly attached to the inner walls of PHC piles by mantle fiber seamless steel pipe in adjusting On.