CN205369231U - Steel -pipe pile is filled in drilling - Google Patents

Abstract

The utility model discloses a bored perfusion steel pipe pile, which relates to the pile foundation engineering technology of rock and soil mechanics. The structure of the utility model is mainly as follows: 4 side wall grouting pipes are uniformly and vertically arranged on the outer wall of the steel pipe pile, 4 post-pressure grouting pipes are evenly and vertically arranged on the inner wall of the steel pipe pile, The grout pipes and the 4 post-pressure grouting pipes are evenly interlaced. On the outer wall of the steel pipe pile, a circle of horizontal stirrups is arranged at an interval of 50cm in the longitudinal direction. The stirrups are disconnected at the post-pressure grouting pipes. Thereby forming a prefabricated pile body; the above-mentioned prefabricated pile body is vertically arranged in the borehole; concrete is poured in the steel pipe pile, and poured in the post-pressure grouting pipe, the side wall grouting pipe and the gap outside the pile body There is grout. Compared with the prior art, the utility model has high construction efficiency, can ensure the verticality and quality of the pile body, and has good reliability; during the pile group construction, the prefabricated pile body can be installed with a high pile platform and a wharf.

Description

A bored steel pipe pile

technical field

The utility model relates to the pile foundation engineering technology of rock and soil mechanics, in particular to a bored perfusion steel pipe pile.

Background technique

In port engineering and offshore engineering, high cap piles and reinforced piles are widely used. The pile body of the high cap pile is above the water surface, the structure is air-permeable, the reflection of waves is small, and it is easy to berth; the pile foundation has the characteristics of good mechanical performance and strong overall stability.

A large number of prefabricated concrete piles and prefabricated steel pipe piles are used for pile foundations in port projects, and bored piles are mostly used on shallow bedrock or soft rock foundations. Usually cast-in-situ piles use steel cages as the skeleton structure, but in harbor projects, since the pile body needs to be at a specified height above the water surface and needs to be connected to the cap, when using steel cages as the skeleton, it needs to be welded below the water surface of the pile body Reserve steel bars.

On the exposed seabed, coral reef and soft rock foundation, the method of driving prefabricated steel pipe piles has certain difficulties, and it will also damage the soft rock structure. Vibration during hammering can affect the ecology of coral reefs. If other methods of pile foundation technology are adopted, the construction will be difficult, the efficiency will be low, and the project cost will increase.

Therefore need a kind of efficient, reliable, high utilization rate pile foundation and its construction method.

Utility model content

The purpose of the utility model is to overcome the problems existing in the prior art and provide a bored steel pipe pile.

The purpose of this utility model is achieved in that:

The utility model comprises a steel pipe pile, a post-pressure grouting pipe, a side wall grouting pipe, a concrete grouting pipe, a drill hole, a stirrup and a flange;

On the outer wall of the steel pipe pile, there are 4 side wall grouting pipes evenly and vertically, and on the inner wall of the steel pipe pile, there are 4 post-grouting pipes, 4 side wall grouting pipes and 4 post-grouting pipes The grouting pipes are uniformly interlaced with each other. On the outer wall of the steel pipe pile, a circle of horizontal stirrups is arranged at a distance of 50 cm along the longitudinal direction. The stirrups are disconnected at the post-pressing grouting pipes to form a prefabricated pile body;

The above-mentioned prefabricated pile body is vertically arranged in the borehole;

In the center of the steel pipe pile, a concrete grouting pipe is vertically arranged (it is a temporary component for construction and will be removed after pouring), and the concrete grouting pipe is made of multi-sections connected by flanges;

Concrete is poured in the steel pipe pile, and cement slurry is poured in the post-pressure grouting pipe, the side wall grouting pipe and the gap outside the pile body.

Compared with the prior art, the utility model has the following advantages and positive effects:

①The construction efficiency is high, the verticality and quality of the pile body can be guaranteed, and the reliability is good;

② During pile group construction, the prefabricated pile body can be installed with high pile platform and wharf;

③ It can avoid construction steps such as welding when the traditional bored pile uses the steel cage as the skeleton, and the integrity of the pile body is strong.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of a section of the utility model.

In the picture:

1—steel pipe pile;

2—Post-pressing grouting pipe;

3—side wall grouting pipe;

4—Concrete grouting pipe;

5—drilling;

6—stirrup;

7—Flange.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in detail.

1. Overall

As shown in Figures 1 and 2, the utility model includes a steel pipe pile 1, a back grouting pipe 2, a sidewall grouting pipe 3, a concrete grouting pipe 4, a bore 5, a stirrup 6 and a flange 7;

Four side wall grouting pipes 3 are uniformly and vertically arranged on the outer wall of the steel pipe pile 1, and four post-pressure grouting pipes 2, four side wall grouting pipes 3 and The four post-pressure grouting pipes 2 are uniformly interlaced with each other. On the outer wall of the steel pipe pile 1, a circle of horizontal stirrups 6 is arranged at an interval of 50 cm in the longitudinal direction. open to form a prefabricated pile;

The above-mentioned prefabricated pile body is vertically arranged in the borehole 5;

In the center of the steel pipe pile 1, a concrete grouting pipe 4 is vertically arranged (it is a temporary component for construction, and is removed after pouring), and the concrete grouting pipe 4 is connected by multi-sections through flanges 7;

Concrete is poured in the steel pipe pile 1, and cement slurry is poured in the post-pressure grouting pipe 2, the side wall grouting pipe 3 and the voids outside the pile body.

Working mechanism:

After the prefabricated pile body is placed and fixed in the borehole 5, high-pressure cement slurry is pressed through the sidewall grouting pipe 3, and the cement slurry emerges from the lower part of the sidewall grouting pipe 3, and flows upward to fill the steel pipe pile 1 and the borehole. 5; after the cement slurry has solidified and hardened, use the concrete grouting pipe 4 to pour concrete into the steel pipe pile 1 (the concrete grouting pipe 4 is continuously lifted during the pouring process, and the port of the concrete grouting pipe 4 keep at least 20cm below the concrete liquid level); after the concrete sets, press the high-pressure cement slurry through the post-pressing grouting pipe 2; the stirrup 6 welded on the outer wall of the steel pipe pile 1 can improve the bite of the steel pipe pile 1 and the cement slurry force.

2. Functional components

1. Steel pipe pile 1

The steel pipe pile 1 is a steel pipe with an outer diameter of 60-100cm and a wall thickness of 30-50mm; its function is to serve as the main skeleton of the drilled steel pipe pile, with high compressive strength and good stability of the pile body.

2. Post-pressure grouting pipe 2

Post-grouting grouting pipe 2 is an iron pipe, sealed well, with an outer diameter of 30 mm and a wall thickness of 3 mm; post-grouting grouting pipe 2 is evenly welded on the inner wall of steel pipe pile 1; After the concrete, after the concrete sets and hardens for a period of time, the high-pressure grout is pressed through the post-pressing grouting pipe 2 .

3. Side wall grouting pipe 3

The side wall grouting pipe 3 is an iron pipe, well sealed, with an outer diameter of 30 mm and a wall thickness of 3 mm; the side wall grouting pipe 3

Uniformly welded on the side wall of the steel pipe pile 1, and arranged in a staggered manner with the post-grouting grouting pipes 2. After the steel pipe pile 1 is fixedly placed in the borehole 5, high-pressure cement slurry is pressed through the side wall grouting pipe 3, and the cement slurry can fill the gap between the borehole 5 and the steel pipe pile 1.

4. Concrete grouting pipe 4

The concrete grouting pipe 4 is a steel pipe with an outer diameter of 200 mm and a wall thickness of 10 mm; the concrete grouting pipe 4 is at the center of the steel pipe pile 1, and concrete is poured into the steel pipe pile 1 through the concrete grouting pipe 4 .

5. Drilling 5

The borehole 5 is mechanically drilled, and the inner diameter of the borehole 5 is greater than the diameter of the pile body after welding.

6. Stirrup 6

The stirrups 6 are ordinary threaded steel bars, and the stirrups 6 are welded on the circumference of the steel pipe pile, disconnected at the side wall grouting pipe 3, and a circle of stirrups is arranged at intervals of 50 cm along the longitudinal direction.

7. Flange 7

The flange 7 is a commercially available standard product, which is used for the joint connection of the concrete grouting pipe 4 .

3. Construction method

The construction process is divided into: pile body prefabrication, drilling, hole clearing, embedding the prefabricated pile body, pressing the side wall cement slurry, pouring concrete, and pressing the grout after pressing.

1. On the inner wall of the steel pipe pile 1, 4 post-grouting pipes 2 are evenly distributed, and on the outer wall of the steel pipe pile 1, 4 side wall grouting pipes 3 are evenly welded;

2. During construction, first use a drilling rig to drill a hole with a diameter slightly larger than the diameter of the pile body, and clear the hole after reaching the specified depth; use a crane to lift and bury the pile body, position the pile body, pass a high-pressure grouting machine, and use the side wall The grouting pipe 3 is used to inject cement slurry into the gap between the pile body and the inner wall of the borehole 5; the cement slurry is rushed out from the bottom end of the side wall grouting pipe 3 and filled with the gap; Use the concrete grouting pipe 4 to pour concrete into the steel pipe pile 1, use the clear water to flush the valve within 12 hours after pouring, and use a high-pressure grouting machine to press the grout through the post-pressing grouting pipe 2.

Claims (1)

1. a drill-pouring steel-pipe pile, it is characterised in that:

Including steel-pipe pile (1), post jacking Grouting Pipe (2), side wall grouting pipe (3), concrete grouting pipe (4), boring (5), stirrup (6) and flange (7)；

Outer wall uniform vertical at steel-pipe pile (1) is provided with 4 side wall grouting pipes (3), inwall uniform vertical at steel-pipe pile (1) is provided with 4 post jacking Grouting Pipe (2), 4 side wall grouting pipes (3) and 4 post jacking Grouting Pipe (2) are uniformly interlocked each other, outer wall in steel-pipe pile (1), longitudinally the stirrup (6) that one circle is horizontal is set every 50cm distance, stirrup (6) disconnects at post jacking Grouting Pipe (2) place, thus constituting prefabricated pile body；

It is vertically installed with above-mentioned prefabricated pile body in boring (5)；

At the center of steel-pipe pile (1), being vertically installed with 1 concrete grouting pipe (4), concrete grouting pipe (4) is formed by connecting by flange (7) by many segmentations；

In steel-pipe pile (1), build concrete, in the space in post jacking Grouting Pipe (2), side wall grouting pipe (3) and beyond pile body, build cement mortar.