CN215105252U

CN215105252U - Pile bottom post-grouting reinforced concrete pre-tensioning method prestressed hollow square pile capable of being constructed in sections

Info

Publication number: CN215105252U
Application number: CN202023078180.5U
Authority: CN
Inventors: 尹晓一; 盖文波; 孙占南; 王友恒; 安宝芹; 唐康; 李明军; 王树国; 张成波; 李帅
Original assignee: Binzhou University
Current assignee: Binzhou University
Priority date: 2020-12-20
Filing date: 2020-12-20
Publication date: 2021-12-10
Anticipated expiration: 2030-12-20

Abstract

The utility model discloses a hollow square pile of pressure mud jacking reinforced concrete pretension method prestressing force behind pile bottom of can segmentation construction, characterized by: the square pile is a reinforced concrete square pile with a vertical through hole in the center; the reinforcement cage of the reinforced concrete square pile consists of eight reinforcements and a plurality of stirrups, the eight reinforcements (4) are vertically fixed in the stirrups (5) which are vertically and symmetrically distributed, the eight reinforcements are uniformly distributed along the periphery of the stirrups, and the reinforcements and the stirrups are fastened in concrete; two grouting pipes which are deep to the bottom of the pile are uniformly distributed in the concrete around the vertical through hole, the grouting pipes of the upper pile and the lower pile are connected through bell and spigot screw threads at the joints of the segmental connection, meanwhile, the upper pile and the lower pile are connected by welding through an end plate (3) when spliced into a whole pile, and a crumple zone (11) is distributed at the middle lower part of the spigot (6). The utility model discloses can solve the connection problem of stake and stake effectively, guarantee pile foundation length and reach the degree of depth of design, the practicality is strong.

Description

Pile bottom post-grouting reinforced concrete pre-tensioning method prestressed hollow square pile capable of being constructed in sections

Technical Field

The utility model relates to a reinforced concrete pile technical field, concretely relates to hollow square pile of reinforced concrete pretension method prestressing force is pressed to mud jacking behind pile bottom of can segmentation construction.

Background

The prestressed reinforced concrete pile has high reliability and saves materials, but because of the limitation of transportation and hoisting equipment, the length of a single section is generally small, and the prestressed reinforced concrete pile is generally divided into a plurality of sections, is driven into the sections and is spliced on site. In the pile type post grouting construction, the butt joint of grouting pipes is difficult to realize, either the binding is firm or the welding is directly adopted, but the joints are not firm and are easy to separate, and when the pile is connected badly, accidents such as slurry leakage, pipe blockage, deformation and the like can be caused.

Disclosure of Invention

To the above problem, the to-be-solved problem of the utility model is to provide a hollow square pile of reinforced concrete pretensioning method prestressing force of post-grouting at the bottom of pile that can practice thrift the construction.

In order to solve the problem, the utility model discloses a technical scheme is, but hollow square pile of section construction's pile bottom post-grouting reinforced concrete pretensioning method prestressing force, characterized by: the square pile is a reinforced concrete square pile with a vertical through hole in the center; the reinforcement cage of the reinforced concrete square pile consists of eight reinforcements and a plurality of stirrups, the eight reinforcements 4 are vertically fixed in a plurality of stirrups 5 which are vertically and symmetrically distributed, the eight reinforcements are uniformly distributed along the periphery of the stirrups, and the reinforcements and the stirrups are fastened in concrete; two grouting pipes which are deep to the bottom of the pile are evenly distributed in the concrete around the vertical through hole, the grouting pipes of the upper pile and the lower pile are connected through bell and spigot screw threads at the joints of the segmental connection, meanwhile, the upper pile and the lower pile are connected through an end plate 3 in a welding mode when spliced into a whole pile, and a crumple zone 11 is distributed at the middle lower part of the spigot 6.

The post-grouting reinforced concrete pretensioned prestressed hollow square pile with the pile bottom capable of being constructed in an segmented mode is a linear square pile with the length of 0.4m, the width of 0.4m and the height of 15 m.

The diameter of the steel bar 4 is 16 mm.

The diameter of the grouting pipe 2 is 20 mm.

The end plate 3 is made of Q235 steel.

The bell and spigot adopts Q235 steel.

The diameter of a bell mouth 7 in the bell socket is slightly smaller than that of the spigot 6, and the bell socket is slightly plastically deformed and sealed by using pile pressing pressure during connection.

The crumple zone 11 is located at the middle lower part of the spigot 6, the range is 5cm high, and deformation is utilized to prevent the spigot and socket from being difficult to assemble during interference connection.

The utility model has the advantages that: the mud jacking pipe adopts the end plate welding through setting up the bell and spigot connection and when the upper and lower square pile splices into whole stake, prevents effectively that the impaired pile that becomes of cross-section from breaking, improves the whole bearing capacity of pile foundation and guarantees that pile foundation length reaches the degree of depth of design regulation. The effect is good, the structure is reasonable and the construction is simple.

Drawings

FIG. 1 is a schematic view of a pre-stressed hollow square pile of the present invention, which can be constructed in sections, made of post-grouted reinforced concrete;

FIG. 2 is a schematic view of the reinforcement cage inside a single pile bottom post-grouted reinforced concrete pre-tensioned prestressed hollow square pile;

FIG. 3 is a schematic view of an end plate;

FIG. 4 is a schematic view of a pre-fabricated first post-grouted reinforced concrete pre-tensioned prestressed hollow square pile;

FIG. 5 is a schematic view of a second pre-fabricated pile bottom post-grouted reinforced concrete pre-tensioned pre-stressed hollow square pile;

FIG. 6 is a schematic view of a socket;

figure 7 is a schematic view of a socket.

The pile comprises a square pile, a grouting pipe, an end plate, a reinforcing steel bar, a stirrup, a spigot, a socket, a bellmouth, a grouting pipe hole, a main reinforcement anchor hole, an end plate hole, a crumple zone, a screw thread and a screw thread, wherein the square pile comprises 1 a central vertical through hole, 2 the grouting pipe, 3 the end plate, 4 the reinforcing steel bar, 5 the stirrup, 6 the spigot, 7 the bellmouth, 8 the grouting pipe hole, 9 the main reinforcement anchor hole, 10 the end plate hole, 11 the crumple zone, 12 the screw thread on the spigot and 13 the screw thread on the bellmouth.

Detailed Description

The structure of the present invention will be further explained with reference to the accompanying drawings.

The utility model provides a hollow square pile of stake end post-grouting reinforced concrete pretensioning method prestressing force that can be under construction section by section, characterized by: the square pile is a reinforced concrete square pile with a vertical through hole in the center; the reinforcement cage of the reinforced concrete square pile consists of eight reinforcements and a plurality of stirrups, the eight reinforcements 4 are vertically fixed in a plurality of stirrups 5 which are vertically and symmetrically distributed, the eight reinforcements are uniformly distributed along the periphery of the stirrups, and the reinforcements and the stirrups are fastened in concrete; two grouting pipes which are deep to the bottom of the pile are evenly distributed in the concrete around the vertical through hole, the grouting pipes of the upper pile and the lower pile are connected through bell and spigot screw threads at the joints of the segmental connection, meanwhile, the upper pile and the lower pile are connected through an end plate 3 in a welding mode when spliced into a whole pile, and a crumple zone 11 is distributed at the middle lower part of the spigot 6.

The method comprises the steps of tensioning eight reinforcing steel bars 4 bound with stirrups 5 to control stress by a pre-tensioning method, erecting two grouting pipes 2 at two ends of a diagonal line of the cross section of a centrifugal forming die, arranging an end plate 3 on one side of a pile body, enabling a central end plate hole 10 of the end plate to be coaxial with a central vertical through hole 1 of a square pile, arranging eight main reinforcement anchor holes 9 on the end surface of the end plate 3, connecting prestressed reinforcing steel bars 4 with the end plate 3 through the main reinforcement anchor holes 9, and enabling the grouting pipes 2 to pass through matched grouting pipe holes 8. Pouring concrete in a centrifugal forming die for centrifugal forming; and (3) after concrete pouring is finished and maintained, releasing the reinforcing steel bars, sinking the pile after the static load experiment of the reinforced concrete hollow square pile meets the bearing capacity of the single pile, and ensuring smooth drainage of the site before sinking the pile. A second pile is prefabricated in the same way.

Firstly, a prefabricated first pile (with one side of an end plate 3 upward) is subjected to static pressure pile sinking, and the bearing capacity is ensured after pile forming; screwing the socket 7 prefabricated in advance on the top end of the first pile grouting pipe 2 along the direction of the thread 13, screwing the socket 6 on the lower end of the second pile grouting pipe 2 along the direction of the thread 12, wherein the diameter of the socket 7 is slightly smaller than that of the socket 6. Before installing the bell and spigot, whether the sizes are consistent or not is checked, and the surface of an object is clean and kept dry without oil stains; the central lines of the upper pile section and the lower pile section are overlapped during connection, and deviation of the inclined pile body is avoided. After the bell and spigot are respectively screwed and fixed with the grouting pipes 2, a pile frame or a pile hoop is used for vertically aligning a second pile (with one side of an end plate 3 facing downwards) to the center of the first pile and embedding the second pile on the first pile, the pile frame or the pile hoop is slowly put down to enable the spigot 6 to be inserted into the bell mouth 7, the bell and spigot is slightly plastically deformed and sealed by using the pressure of the pile, and the butt joint of the two pile grouting pipes 2 is completed; the first pile and the second pile are firmly connected, and pile sinking is continued after pile position and perpendicularity are corrected, so that the pile has certain vertical bearing capacity. When the square piles are spliced into the whole pile, the end plates 3 are welded in a butt joint mode, dirt and rust are required to be removed from the end plates at the pile ends before welding, and metal luster is exposed; in the welding process, the displacement and inclination of the pile body are often noticed, and if a problem is found, the deviation should be corrected in time. And cement paste is injected from the mud jacking pipe 2 and fills gaps of soil bodies around the pile body within 48 hours after the pile sinking is stable, so that the corrosion of underground water to the reinforcing steel bars 4 in the reinforced concrete hollow square pile is effectively prevented.

Furthermore, the socket is made of Q235 steel, so that the socket is high in ductility and good in plasticity.

Furthermore, the end plate 3 is made of Q235 steel, so that the forming capability is good, welding is convenient, and certain strength is achieved.

Claims

1. The utility model provides a hollow square pile of stake end post-grouting reinforced concrete pretensioning method prestressing force that can be under construction section by section, characterized by: the square pile is a reinforced concrete square pile with a vertical through hole in the center; the reinforcement cage of the reinforced concrete square pile consists of eight reinforcements and a plurality of stirrups, the eight reinforcements (4) are vertically fixed in the stirrups (5) which are vertically and symmetrically distributed, the eight reinforcements are uniformly distributed along the periphery of the stirrups, and the reinforcements and the stirrups are fastened in concrete; two grouting pipes which are deep to the bottom of the pile are uniformly distributed in the concrete around the vertical through hole, the grouting pipes of the upper pile and the lower pile are connected through bell and spigot screw threads at the joints of the segmental connection, meanwhile, the upper pile and the lower pile are connected by welding through an end plate (3) when spliced into a whole pile, and a crumple zone (11) is distributed at the middle lower part of the spigot (6).

2. The sectionally constructed pile bottom post-grouting reinforced concrete pretensioned prestressed hollow square pile according to claim 1, characterized in that: the post-grouting reinforced concrete pretensioned prestressed hollow square pile with the pile bottom capable of being constructed in an segmented mode is a linear square pile with the length of 0.4m, the width of 0.4m and the height of 15 m.

3. The sectionally constructed pile bottom post-grouting reinforced concrete pretensioned prestressed hollow square pile according to claim 1, characterized in that: the diameter of the steel bar (4) is 16 mm.

4. The sectionally constructed pile bottom post-grouting reinforced concrete pretensioned prestressed hollow square pile according to claim 1, characterized in that: the diameter of the mud jacking pipe (2) is 20 mm.

5. The sectionally constructed pile bottom post-grouting reinforced concrete pretensioned prestressed hollow square pile according to claim 1, characterized in that: the end plate (3) is made of Q235 steel.

6. The sectionally constructed pile bottom post-grouting reinforced concrete pretensioned prestressed hollow square pile according to claim 1, characterized in that: the bell and spigot adopts Q235 steel.

7. The sectionally constructed pile bottom post-grouting reinforced concrete pretensioned prestressed hollow square pile according to claim 1, characterized in that: the diameter of a bell socket (7) in the bell socket is slightly smaller than that of the spigot (6), and the bell socket is slightly elastically deformed and sealed by using pile pressing pressure during connection.

8. The sectionally constructed pile bottom post-grouting reinforced concrete pretensioned prestressed hollow square pile according to claim 1, characterized in that: the crumple zone (11) is located at the middle lower part of the socket (6) and has a height of 5cm in the range.