CN108661045A - A kind of prefabricated GFRP pipe concretes spliced pile - Google Patents

Abstract

A prefabricated GFRP pipe concrete splicing pile has two pile connection methods, the first is a bolt connection method, and the second is a mortise and tenon connection method. The pile body adopting the bolt connection method includes GFRP pipe body, pre-embedded steel pipe, upper flange plate, lower end flange plate, anchor bars and bolts. On the flange plate, screw holes are provided on the lower end flange plate, and the screw holes correspond to the positions of the bolts one by one and are located within the range of the reserved post-cast concrete area. The pile body adopting the mortise and tenon connection method includes a GFRP pipe body, an upper connecting plate and a lower connecting plate. Both the upper connecting plate and the lower connecting plate are provided with a number of wedge-shaped grooves. The wedge-shaped grooves are radially distributed around the center of the plate body. Two The positions of the wedge-shaped grooves on the plate body correspond one by one, and the wedge-shaped grooves are equipped with double-ended wedge-shaped mortise and tenon blocks. Concrete is poured in the GFRP pipe body, and before pouring concrete, you can choose whether to add a reinforcement cage composed of longitudinal bars and spiral stirrups.

Description

A prefabricated GFRP pipe concrete splicing pile

technical field

The invention belongs to the technical field of civil engineering construction, in particular to a prefabricated GFRP pipe concrete splicing pile.

Background technique

At present, my country is building high-speed railways on a large scale. The geological conditions faced by railway subgrades are relatively complex, and pile foundations have become one of the foundations that can better meet complex geological conditions and service load requirements.

Prefabricated pile foundations are used in many large-scale construction projects, bridges, roadbeds and other projects. According to the different materials of prefabricated piles, they can be divided into prefabricated concrete piles, prefabricated steel piles and prefabricated wood piles. Practice has proved that with the use of prefabricated piles, many piles need to be repaired or replaced every year. Taking the United States as an example, the annual cost for repairing and replacing pile foundations can reach about 200 million U.S. dollars. It can be seen that the use of concrete piles, steel piles or wooden piles will face the difficulties of environmental restrictions and high maintenance costs, especially when used in highly corrosive soils, it will face safety hazards and higher maintenance costs due to corrosion. Therefore, the research and development of a new type of pile with high bearing capacity, high rigidity, good seismic ductility, and excellent corrosion resistance has become a research hotspot for engineers in the field of civil engineering.

In recent years, GFRP (Glass Fiber Reinforced Polymer, referred to as GFRP), a lightweight, high-strength, and excellent corrosion-resistant glass fiber reinforced polymer material, has entered the construction market and has become a new type of material in the field of civil engineering. Technical personnel in the field have generated great interest in it, and tried to introduce GFRP material into the prefabricated pile foundation to improve the bearing capacity, seismic ductility and corrosion resistance of the pile foundation, but due to the particularity of GFRP material (due to glass fiber and resin), the pile body made of GFRP material must be spliced to meet the length requirement, but the GFRP material cannot be directly welded and connected due to the special material, which has affected the application of GFRP material in prefabricated pile foundation .

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a prefabricated GFRP pipe-concrete splicing pile, which effectively overcomes the limitation that GFRP materials cannot be welded and connected, and has the characteristics of convenient construction, simple operation, and easy guarantee of connection quality.

In order to achieve the above object, the present invention adopts the following technical scheme: a prefabricated GFRP pipe concrete splicing pile, including GFRP pipe body, longitudinal reinforcement, spiral stirrup, pre-embedded steel pipe, upper end flange plate, lower end flange plate, anchor bar and Bolts; the longitudinal reinforcement and the spiral stirrup form a reinforcement cage, and the reinforcement cage is built into the GFRP pipe body; the upper end flange plate is located at the top nozzle of the GFRP pipe body, and the lower end flange plate is located at the bottom end of the GFRP pipe body The nozzle is fixedly welded with anchor bars on the lower surface of the upper flange plate and the upper surface of the lower end flange plate; the pre-embedded steel pipe is fixed on the upper surface of the lower end flange plate, and the anchor bar is located inside the pre-embedded steel pipe; There is a reserved post-casting concrete area on the outer peripheral side of the pre-embedded steel pipe; a number of evenly distributed bolts are fixedly welded along the circumference of the upper flange plate, and the screw part of the bolt extends upward to the top of the upper flange plate ;A number of screw holes are uniformly distributed along the circumference of the lower flange plate, the screw holes correspond to the positions of the bolts one by one, and the screw holes and bolts are located within the reserved post-cast concrete area; on the upper end flange The GFRP pipe between the plate and the lower end flange plate is poured with concrete, and the longitudinal reinforcement, spiral stirrup, pre-embedded steel pipe and anchor reinforcement are all encapsulated in the concrete.

A prefabricated GFRP pipe concrete splicing pile, comprising a GFRP pipe body, a pre-embedded steel pipe, an upper end flange plate, a lower end flange plate, anchor bars and bolts; the upper end flange plate is located at the top nozzle of the GFRP pipe body, and the The lower flange plate is located at the bottom nozzle of the GFRP pipe body, and anchor ribs are fixedly welded on the lower surface of the upper flange plate and the upper surface of the lower flange plate; the pre-embedded steel pipe is fixed on the upper surface of the lower flange plate, And the anchor bar is located inside the pre-embedded steel pipe; the outer peripheral side of the pre-embedded steel pipe is provided with a reserved post-casting concrete area; along the circumferential direction of the upper flange plate, a number of evenly distributed bolts are fixedly welded, and the bolts The screw part extends upwards to the top of the upper flange plate; there are several screw holes evenly distributed along the circumference of the lower flange plate, the screw holes correspond to the positions of the bolts one by one, and the screw holes and bolts are located in the reserved post-cast concrete Within the scope of the area; the GFRP pipe body between the upper end flange plate and the lower end flange plate is poured with concrete, and the pre-embedded steel pipes and anchor bars are encapsulated in the concrete.

A prefabricated GFRP pipe concrete splicing pile, comprising a GFRP pipe body, a longitudinal bar, a spiral stirrup, an upper end connecting plate and a lower end connecting plate; the longitudinal bar and the spiral stirrup form a reinforcement cage, and the reinforcement cage is built into the GFRP pipe body; The upper connecting plate is located at the top nozzle of the GFRP pipe body, the lower connecting plate is located at the bottom nozzle of the GFRP pipe body, and the lower surface of the upper connecting plate and the upper surface of the lower connecting plate are fixedly welded with anchor ribs; There are several wedge-shaped grooves distributed along the circumferential direction on the upper surface of the upper connecting plate, and several wedge-shaped grooves are distributed along the circumferential direction on the lower surface of the lower connecting plate, and the several wedge-shaped grooves are radially distributed with the center of the plate body as the center. The upper connecting plate and the lower end The positions of the wedge-shaped grooves on the connecting plate are in one-to-one correspondence; the wedge-shaped grooves are equipped with double-ended wedge-shaped mortise and tenon blocks; concrete is poured in the GFRP pipe between the upper end connecting plate and the lower end connecting plate, and the longitudinal reinforcement , Spiral stirrups and anchor bars are encapsulated in concrete.

A prefabricated GFRP pipe concrete splicing pile, comprising a GFRP pipe body, an upper end connection plate and a lower end connection plate; the upper end connection plate is located at the top nozzle of the GFRP pipe body, and the lower end connection plate is located at the bottom end nozzle of the GFRP pipe body , both the lower surface of the upper connecting plate and the upper surface of the lower connecting plate are fixedly welded with anchor ribs; there are several wedge-shaped grooves distributed along the circumferential direction on the upper surface of the upper connecting plate, and some wedge-shaped grooves are also distributed along the circumferential direction on the lower surface of the lower connecting plate. Wedge-shaped grooves, and several wedge-shaped grooves are radially distributed with the center of the plate body as the center, and the positions of the wedge-shaped grooves on the upper connecting plate and the lower connecting plate correspond one-to-one; the wedge-shaped grooves are equipped with double-ended wedge-shaped mortise and tenon blocks; Concrete is poured into the GFRP pipe between the upper connecting plate and the lower connecting plate, and the anchor bars are encapsulated in the concrete.

Beneficial effects of the present invention:

The prefabricated GFRP pipe concrete splicing pile of the present invention effectively overcomes the limitation that GFRP materials cannot be welded and connected, and has the characteristics of convenient construction, simple operation, and easy guarantee of connection quality.

Description of drawings

Fig. 1 is the structural representation of prefabricated GFRP pipe-concrete splicing pile (there is reinforcing cage and pile body bolt connection) of the present invention;

Fig. 2 is the structural representation of the prefabricated GFRP pipe concrete splicing pile (without reinforcement cage and pile body bolt connection) of the present invention;

Fig. 3 is the structural representation of the prefabricated GFRP pipe-concrete splicing pile of the present invention (with reinforcement cage and pile body mortise and tenon connection);

Fig. 4 is the structural representation of the prefabricated GFRP pipe concrete splicing pile (without reinforcement cage and pile body mortise and tenon connection) of the present invention;

Fig. 5 is the structural representation of upper end flange plate;

Fig. 6 is a structural schematic diagram of the lower end flange plate;

Fig. 7 is a schematic structural view of the upper connecting plate;

Fig. 8 is a structural schematic diagram of the lower connecting plate;

Fig. 9 is a schematic diagram of the structure after the upper connecting plate and the lower connecting plate are connected by mortise and tenon;

Fig. 10 is a structural schematic diagram of a double-ended wedge-shaped mortise and tenon block;

In the figure, 1—GFRP pipe body, 2—longitudinal reinforcement, 3—spiral stirrup, 4—embedded steel pipe, 5—upper end flange plate, 6—lower end flange plate, 7—anchor reinforcement, 8—bolt, 9 —Reserved post-pouring concrete area, 10—screw hole, 11—concrete, 12—upper connecting plate, 13—lower connecting plate, 14—wedge-shaped groove, 15—double-ended wedge-shaped mortise and tenon block.

Detailed ways

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

As shown in Figure 1, a prefabricated GFRP pipe concrete splicing pile includes GFRP pipe body 1, longitudinal reinforcement 2, spiral stirrup 3, pre-embedded steel pipe 4, upper end flange plate 5 (as shown in Figure 5), lower end method Blue plate 6 (as shown in Figure 6), anchor bars 7 and bolts 8; the longitudinal bars 2 and spiral stirrups 3 form a reinforcement cage, and the reinforcement cage is built in the GFRP pipe body 1; the upper end flange plate 5 is located The top nozzle of the GFRP pipe body 1, the lower end flange plate 6 is located at the bottom end nozzle of the GFRP pipe body 1, the lower surface of the upper end flange plate 5 and the upper surface of the lower end flange plate 6 are fixedly welded with anchor ribs 7 The pre-embedded steel pipe 4 is fixed on the upper surface of the lower flange plate 6, and the anchor bar 7 is located inside the pre-embedded steel pipe 4; the outer peripheral side of the pre-embedded steel pipe 4 is provided with a reserved post-cast concrete area 9; along the The plate body circumferential direction of the upper end flange plate 5 is fixedly welded with some evenly distributed bolts 8, and the screw part of the bolts 8 extends upward to the top of the upper end flange plate 5; There are a number of screw holes 10, the screw holes 10 correspond to the positions of the bolts 8 one by one, and the screw holes 10 and the bolts 8 are located in the range of the reserved post-cast concrete area 9; the upper flange plate 5 and the lower flange The GFRP pipe body 1 between the plates 6 is poured with concrete 11 , and the longitudinal reinforcement 2 , spiral stirrup 3 , pre-embedded steel pipe 4 and anchor reinforcement 7 are all encapsulated in the concrete 11 .

As shown in Figure 2, a prefabricated GFRP pipe concrete splicing pile includes a GFRP pipe body 1, an embedded steel pipe 4, an upper end flange plate 5 (as shown in Figure 5), and a lower end flange plate 6 (as shown in Figure 6 ), anchor bars 7 and bolts 8; the upper end flange plate 5 is located at the top nozzle of the GFRP pipe body 1, the lower end flange plate 6 is located at the bottom end nozzle of the GFRP pipe body 1, and the upper end flange plate 5 Both the lower surface and the upper surface of the lower flange plate 6 are fixedly welded with anchor ribs 7; The outer peripheral side of the steel pipe 4 is provided with a reserved post-cast concrete area 9; a number of evenly distributed bolts 8 are fixedly welded along the circumference of the upper flange plate 5, and the screw parts of the bolts 8 extend upward to the upper end. Above the blue plate 5; there are several screw holes 10 evenly distributed along the circumference of the lower flange plate 6, the screw holes 10 correspond to the positions of the bolts 8 one by one, and the screw holes 10 and the bolts 8 are located in the reserved post-casting concrete area 9; concrete 11 is poured in the GFRP pipe body 1 between the upper end flange plate 5 and the lower end flange plate 6, and the pre-embedded steel pipe 4 and the anchor bars 7 are encapsulated in the concrete 11.

As shown in Figure 3, a prefabricated GFRP pipe concrete splicing pile includes a GFRP pipe body 1, a longitudinal bar 2, a spiral stirrup 3, an upper connecting plate 12 (as shown in Figure 7) and a lower connecting plate 13 (as shown in Figure 8 shown); the longitudinal bar 2 and the spiral stirrup 3 form a reinforcement cage, and the reinforcement cage is built in the GFRP pipe body 1; the upper end connecting plate 12 is located at the top nozzle of the GFRP pipe body 1, and the lower end connecting plate 13 Located at the bottom nozzle of the GFRP pipe body 1, anchor ribs 7 are fixedly welded on the lower surface of the upper connecting plate 12 and the upper surface of the lower connecting plate 13; on the upper surface of the upper connecting plate 12, there are several wedge-shaped grooves distributed along the circumferential direction 14. A number of wedge-shaped grooves 14 are also distributed along the circumferential direction on the lower surface of the lower connecting plate 13, and several wedge-shaped grooves 14 are radially distributed with the center of the plate body as the center. The upper connecting plate 12 and the wedge-shaped grooves 14 on the lower connecting plate 13 The positions correspond to each other (as shown in Figure 9); the wedge-shaped groove 14 is equipped with a double-ended wedge-shaped mortise and tenon block 15 (as shown in Figure 10); between the upper end connecting plate 12 and the lower end connecting plate 13 Concrete 11 is poured into the GFRP pipe body 1, and the longitudinal reinforcement 2, the spiral stirrup 3 and the anchor reinforcement 7 are all encapsulated in the concrete 11.

As shown in Figure 4, a kind of prefabricated GFRP pipe concrete splicing pile comprises GFRP pipe body 1, upper end connecting plate 12 (as shown in Figure 7) and lower end connecting plate 13 (as shown in Figure 8); described upper end connecting plate 12 is located at the top nozzle of the GFRP pipe body 1, the lower end connecting plate 13 is located at the bottom end nozzle of the GFRP pipe body 1, and the lower surface of the upper connecting plate 12 and the upper surface of the lower connecting plate 13 are fixedly welded with anchor ribs 7; Several wedge-shaped grooves 14 are distributed along the circumferential direction on the upper surface of the upper connecting plate 12, and several wedge-shaped grooves 14 are also distributed along the circumferential direction on the lower surface of the lower connecting plate 13, and several wedge-shaped grooves 14 are radiating around the center of the plate body. The position of the wedge-shaped groove 14 on the upper end connecting plate 12 and the lower end connecting plate 13 corresponds one by one (as shown in Figure 9); the wedge-shaped groove 14 is equipped with a double-ended wedge-shaped mortise and tenon block 15 (as shown in Figure 10 shown); concrete 11 is poured in the GFRP pipe body 1 between the upper end connecting plate 12 and the lower end connecting plate 13, and the anchor bar 7 is encapsulated in the concrete 11.

Below in conjunction with accompanying drawing, pile-connecting process of the present invention is illustrated:

Example 1: Prefabricated GFRP pipe-concrete splicing piles using bolt connection

When the first prefabricated pile is finished, the second prefabricated pile needs to be connected. First, the second prefabricated pile is hoisted so that the screw hole 10 on the flange plate 6 at the lower end of the second prefabricated pile is aligned with the first prefabricated pile. Bolt 8 on the flange plate 5 at the upper end of the prefabricated pile, and then slowly control the falling of the second prefabricated pile, so that the screw part of the bolt 8 passes through the screw hole 10 until the flange plate 6 at the lower end of the second prefabricated pile is connected to the first The flange plate 5 at the upper end of the root prefabricated pile is tightly fitted together, and then a nut is installed on the screw rod for locking, and finally quick-setting concrete is poured in the reserved post-cast concrete area 9, and the post-cast quick-setting concrete will be located in the reserved post-cast concrete area 9. The bolts and nuts in the post-cast concrete area 9 are all encapsulated, and after the quick-setting concrete in the reserved post-cast concrete area 9 reaches the design strength, the pile sinking operation can be continued.

Example 2: Prefabricated GFRP pipe concrete splicing piles using mortise and tenon connection

After the first prefabricated pile sinking is completed, the second prefabricated pile needs to be connected. First, the second prefabricated pile is hoisted so that the wedge-shaped groove 14 on the connecting plate 13 at the lower end of the second prefabricated pile is aligned with the first prefabricated pile. the wedge-shaped groove 14 on the pile upper connecting plate 12, and then slowly control the second prefabricated pile to fall until the second prefabricated pile lower connecting plate 13 and the first prefabricated pile upper connecting plate 12 are tightly fitted together, and then the double The head wedge-shaped mortise and tenon block 15 is inserted into the wedge-shaped groove 14 that is buckled together, and the double-headed wedge-shaped mortise and tenon block 15 is used to firmly connect the lower end connecting plate 13 of the second prefabricated pile with the upper end connecting plate 12 of the first prefabricated pile. After that, the pile sinking operation can be continued.

The solutions in the embodiments are not intended to limit the scope of patent protection of the present invention, and all equivalent implementations or changes that do not deviate from the present invention are included in the patent scope of this case.

Claims (4)

1. a kind of prefabricated GFRP pipe concretes spliced pile, it is characterised in that：Including GFRP tube bodies, vertical muscle, tie hoop, pre-buried steel Pipe, upper flanges plate, lower end flanged plate, dowel and bolt；The vertical muscle constitutes steel reinforcement cage with tie hoop, and steel reinforcement cage is built in In GFRP tube bodies；The upper flanges plate is located at the top nozzle of GFRP tube bodies, and the lower end flanged plate is located at GFRP tube bodies Bottom end nozzle is fixedly welded with dowel in upper flanges plate lower surface and lower end flanged plate upper surface；The embedded steel tube is solid Mounted in lower end flanged plate upper surface, and dowel is located on the inside of embedded steel tube；The embedded steel tube peripheral side is mixed equipped with being poured after reserving The areas Ning Tu；Several bolts being uniformly arranged, and the threaded shank of bolt are welded with along the plate body of the upper flanges plate is circumferentially fixed Divide and extends to upward above upper flanges plate；Plate body along the lower end flanged plate is circumferentially evenly equipped with several screw holes, screw hole and spiral shell The position of bolt corresponds, and screw hole and bolt are located in the range of reserved rear pouring concrete area；The upper flanges plate with Concrete is cast in GFRP tube bodies between the flanged plate of lower end, the vertical muscle, tie hoop, embedded steel tube and dowel encapsulate In in concrete.

2. a kind of prefabricated GFRP pipe concretes spliced pile, it is characterised in that：Including GFRP tube bodies, embedded steel tube, upper flanges plate, Lower end flanged plate, dowel and bolt；The upper flanges plate is located at the top nozzle of GFRP tube bodies, and the lower end flanged plate is located at The bottom end nozzle of GFRP tube bodies is fixedly welded with dowel in upper flanges plate lower surface and lower end flanged plate upper surface；It is described Embedded steel tube is packed in lower end flanged plate upper surface, and dowel is located on the inside of embedded steel tube；The embedded steel tube peripheral side is equipped with Pouring concrete area after reserved；Several bolts being uniformly arranged, and spiral shell are welded with along the plate body of the upper flanges plate is circumferentially fixed The screw portion of bolt is extended to upward above upper flanges plate；Plate body along the lower end flanged plate is circumferentially evenly equipped with several spiral shells The position of hole, screw hole and bolt corresponds, and screw hole and bolt are located in the range of reserved rear pouring concrete area；On described Concrete is cast in GFRP tube bodies between end flanges plate and lower end flanged plate, the embedded steel tube and dowel are packaged in mixed In solidifying soil.

3. a kind of prefabricated GFRP pipe concretes spliced pile, it is characterised in that：Connect including GFRP tube bodies, vertical muscle, tie hoop, upper end Fishplate bar and lower end connecting plate；The vertical muscle constitutes steel reinforcement cage with tie hoop, and steel reinforcement cage is built in GFRP tube bodies；The upper end Connecting plate is located at the top nozzle of GFRP tube bodies, and the lower end connecting plate is located at the bottom end nozzle of GFRP tube bodies, is connected in upper end Plate lower surface and lower end connecting plate upper surface are fixedly welded with dowel；Have upper end connecting plate upper surface is circumferentially distributed Several wedge grooves are circumferentially also distributed in lower end connecting plate lower surface in several wedge grooves, and several wedge grooves are with the plate body center of circle Centered on be radially distributed, the position of the wedge groove on upper end connecting plate and lower end connecting plate corresponds；The wedge groove It is fitted with double end wedge shape mortise and tenon block；It is cast with coagulation in GFRP tube bodies between the upper end connecting plate and lower end connecting plate Soil, the vertical muscle, tie hoop and dowel are packaged in concrete.

4. a kind of prefabricated GFRP pipe concretes spliced pile, it is characterised in that：It is connected including GFRP tube bodies, upper end connecting plate and lower end Plate；The upper end connecting plate is located at the top nozzle of GFRP tube bodies, and the lower end connecting plate is located at the bottom end nozzle of GFRP tube bodies, It is fixedly welded with dowel in upper end connecting plate lower surface and lower end connecting plate upper surface；On upper end connecting plate upper surface edge It is circumferentially distributed to have several wedge grooves, several wedge grooves, and several wedge grooves is circumferentially also distributed in lower end connecting plate lower surface It is radially distributed centered on the plate body center of circle, upper end connecting plate and the position of the wedge groove on the connecting plate of lower end correspond； The wedge groove is fitted with double end wedge shape mortise and tenon block；It is poured in GFRP tube bodies between the upper end connecting plate and lower end connecting plate It is marked with concrete, the dowel is packaged in concrete.