CN210086215U

CN210086215U - Grouting pile for reinforcing soft soil foundation

Info

Publication number: CN210086215U
Application number: CN201920670999.9U
Authority: CN
Inventors: 王飞
Original assignee: Chongqing Jiaotong University
Current assignee: Chongqing Jiaotong University
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-02-18
Anticipated expiration: 2029-05-10

Abstract

The utility model discloses a grouting pile for reinforcing soft soil foundation, which comprises a pile body and a pile head at the lower end of the pile body, wherein the pile body consists of a main pile body and at least three side pile bodies, the side pile bodies are fixedly connected with the side wall of the main pile body, grouting pipes are arranged inside the three side pile bodies, and grout outlet holes of the grouting pipes are positioned on the outer wall of the side pile body; the pile head comprises main back taper head and at least three side back taper piece, three side back taper piece all with main back taper head rigid coupling, and the top surface and the side pile body bottom surface rigid coupling of three side back taper piece, the top surface of side back taper piece is the arc surface of indent, its low side is connected with the main pile body, its high-end is located the outside, the bottom of three side pile body all is connected with the bottom of main back taper head, special-shaped pile body increase frictional force, special-shaped pile head can be pressed into in the soil easily, direct pressure equipment is the slip casting on one side, can save man-hour, frictional force increases, promote the stability of slip casting pile, thereby can improve the bearing capacity, and side back taper piece top surface is similar to the indent crotch, can the resistance to plucking, prevent the upward floating of slip casting pile.

Description

Grouting pile for reinforcing soft soil foundation

Technical Field

The utility model belongs to the technical field of the construction of handling the soft soil foundation, concretely relates to consolidate slip casting stake of soft soil foundation.

Background

Soft soil is a general term for a kind of soil, and is mainly classified into soft cohesive soil, mucky soil, silt, peat and the like, and has the characteristics of large natural water content, high compressibility, low bearing capacity and small permeability. The soft soil is widely distributed in China, and is mainly located on both sides of coastal areas, plain areas, inland lake basins, depressions and rivers. Soft soil engineering is poor in properties, and engineering construction can be carried out on the soft soil engineering generally by foundation treatment. When a thick soft soil layer or a deep soil layer which can be used as a bearing layer exists, a high-pressure injection grouting method is generally adopted to form a consolidation body in the soil body so as to increase the bearing capacity, or a foundation adopts a friction pile form to improve the strength of the soft soil.

However, the former soft soil reinforcing method needs more equipment and has longer working hours; the later soft soil reinforcing method can cause the friction pile to float upwards and rotate due to the slippage of the soil body in the later construction period, the bearing capacity is reduced, the building is unevenly settled, and safety accidents are caused.

SUMMERY OF THE UTILITY MODEL

To the technical problem that prior art exists, the utility model provides a consolidate slip casting stake of weak soil foundation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a grouting pile for reinforcing a soft soil foundation comprises a pile body and a pile head fixedly connected to the lower end of the pile body, wherein the pile body consists of a main pile body and at least three side pile bodies, the three side pile bodies are fixedly connected with the side wall of the main pile body, the three side pile bodies are partially overlapped with the main pile body, grouting pipes are arranged in the three side pile bodies, grouting pipe openings of the grouting pipes are positioned at the top ends of the side pile bodies, and grouting holes of the grouting pipes are distributed in the outer wall of the side pile body and are adjacent to the pile head; the pile head comprises main back taper head and at least three side back taper piece, main back taper head rigid coupling is in the lower extreme of main pile body, it is three the side back taper piece all with the outer wall rigid coupling of main back taper head, and three the top surface of side back taper piece respectively one by one with three side pile body bottom surface rigid coupling, the top surface of side back taper piece is the arc surface of indent, moreover the low side of arc surface be located inboard and with main pile body connects, and its high-end is located the outside, and is three the bottom of side pile body all with the bottom of main back taper head is connected.

Further, the main pile body with the side pile body is the cylinder structure, and is cylindrical the diameter of side pile body is less than the diameter of main pile body, it is three the side pile body centers on the main pile body is equidistant interval distribution, and three cylindrical structure constitute a regular triangle after the centre of a circle of side pile body is connected.

Furthermore, the grouting pipes in the side pile bodies are of an L-shaped structure, the circle centers of the grouting pipes and the side pile bodies are concentrically distributed, and the circle centers of the grouting pipes on the top surfaces of the three side pile bodies are connected to form a regular triangle.

Furthermore, an included angle between the top surface of the side inverted cone block and the pile body is 60-80 degrees; the high-end point of the arc surface of the side inverted cone is connected with the circle center of the arc surface to form a straight line, and the included angle between the straight line and the axis of the pile body is 30-60 degrees.

Furthermore, the outer side surface of the side inverted cone block is a convex arc surface.

The utility model has the advantages that: after a grouting pile is prefabricated by a mould, a pile body is erected to be aligned to a pile position, a pile head is pressed into soft soil by a press fitting machine until a grout outlet is positioned in the soft soil and has a certain depth, grouting equipment is connected by a grouting pipe, grouting is carried out while sinking the pile, slurry is sprayed to the outer side of the pile body and the soil body around the pile body along the downward movement path of the grout outlet, the soil body is solidified into cement soil, and the cement soil is solidified after a period of time so as to facilitate grouting of the pile and realize soft soil reinforcement. In the grouting process, the side pile body is fixedly connected to the outer wall of the main pile body to form a special-shaped pile body similar to the three-petal quincuncial pile, the friction area between the pile body and a soil body can be increased in the pile pressing process, the friction force is increased, the stability of the grouting pile is improved, and therefore the bearing capacity can be improved. The main inverted cone head is connected with the three side inverted cone blocks to form a special-shaped pile head, so that the whole grouting pile can be pressed into the soil more easily, and grouting is performed while pile pressing is performed, so that the working time can be saved, and the working efficiency is improved. The top surface of three side inverted cone blocks is the indent arc surface, and the low end of arc surface be located the inboard moreover and with main pile body connects, and its high-end is located the outside, therefore the top of side inverted cone block has formed a crotch structure similar to the indent, can resistance to plucking, prevents the slip casting stake come-up. The grouting pile can not easily rotate and float upwards, and the friction force of the cement soil solidified around the grouting pile can be continuously kept to be increased, so that the condition of uneven settlement can be avoided.

Drawings

Fig. 1 is the utility model provides a pair of the grouting pile's of consolidating soft soil foundation structural schematic diagram.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is a cross-sectional view of fig. 1.

Fig. 5 is a schematic view of the construction state of the present invention.

In the figure, 100-pile body, 110-main pile body, 120-side pile body, 121-grouting pipe, 1211-grouting pipe opening, 1212-grout outlet, 200-pile head, 210-main inverted cone head, 220-side inverted cone block, 300-soft soil foundation and 400-grouting slurry.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

As shown in fig. 1-5, the utility model provides a grouting pile for reinforcing soft soil foundation, including pile body 100, and the pile head 200 of rigid coupling in the lower extreme of pile body 100, pile body 100 comprises main pile body 110 and at least three side pile bodies 120, three side pile bodies 120 all with main pile body 110 lateral wall rigid coupling, and three side pile bodies 120 with main pile body 110 partially coincide, grouting pipe 121 has all been seted up to the inside of three side pile bodies 120, grouting pipe 121's grouting pipe mouth 1211 is located the top of side pile body 120, grout outlet 1212 of grouting pipe 121 distributes on the outer wall of side pile body 120 and is close to pile head 200; pile head 200 comprises main back taper head 210 and at least three side back taper piece 220, main back taper head 210 rigid coupling is in the lower extreme of main pile body 110, it is three the equal inside wall of side back taper piece 220 with the outer wall rigid coupling of main back taper head 210, and three the top surface of side back taper piece 220 is one by one and three respectively side pile body 120 bottom surface rigid coupling, the top surface of side back taper piece 220 is the arc surface of indent, moreover the low side of arc surface be located inboard and with main pile body 110 connects, and it is high-end to be located the outside, and is three the bottom of side pile body 120 all with the bottom of main back taper head 210 is connected.

As an alternative embodiment, the main pile 110 and the side piles 120 are both cylindrical structures. The diameter of the cylindrical side pile body 120 is smaller than that of the main pile body 110, the three side pile bodies 120 are distributed around the main pile body 110 at equal intervals, and the centers of the three cylindrical side pile bodies 120 are connected to form a regular triangle. The grouting pipes 121 in the side pile body 120 are in an L-shaped structure, the circle centers of the mouths of the grouting pipes 121 and the circle center of the side pile body 120 are concentrically distributed, and the circle centers of the mouths of the grouting pipes 121 on the top surface of the three side pile bodies 120 are connected to form a regular triangle. Three side piles 120 are distributed around main pile 110 at equal intervals, and three side inverted cone blocks 220 are distributed around main inverted cone head 210 at equal intervals, so that the grouting pile can be uniformly pressed into soft soil under stress in the pile pressing process, and the grout outlet with the structure can be uniformly discharged outside pile 100. The grouting pipe 121 in the L shape can achieve faster grout outlet, the grout outlet 1212 is close to the pile head 200, and grout can diffuse fast in the pile sinking process.

The lateral surface of side back taper piece 220 is the arc surface of evagination, forms one after the bottom of three side back taper piece 220 is connected and has gapped special-shaped pile head 200 similar to the bullet head, and the arc surface of side back taper piece 220 evagination can play the effect of enlarging pile week moreover, consequently can be quick easily impress pile head 200 in the weak soil, prevents that pile body 100 that the pile group effect arouses from rotating.

By adopting the structure, after the grouting pile is prefabricated by a mould, the pile body 100 is erected to be aligned with the pile position, the pile head 200 is pressed into soft soil by a press-fitting machine, after the grout outlet 1212 is positioned in the soft soil and has a certain depth, the grouting equipment is connected by the grouting pipe 121, grouting slurry 400 is poured into the grouting pile while the pile is sunk, the slurry is sprayed to the outer side of the pile body 100 and the surrounding soil body along the downward moving path of the grout outlet, the soil body is solidified into cement soil, and the cement soil is solidified after a period of time so as to be convenient for grouting the pile together to realize soft soil reinforcement. In the grouting process, the side pile body 120 is fixedly connected to the outer wall of the main pile body 110 to form the special-shaped pile body 100 similar to a three-petal quincuncial pile, the friction area between the pile body 100 and a soil body can be increased in the pile pressing process, the friction force is increased, the stability of the grouting pile is improved, and therefore the bearing capacity can be improved. The main inverted cone head 210 is connected with three side inverted cone blocks 220 to form a special-shaped pile head 200, so that the whole grouting pile can be pressed into the soil more easily. Compared with the traditional high-pressure injection grouting method, the pile pressing and soil burying are easier, and grouting can be performed while pile pressing is performed, so that the working time is saved, and the working efficiency is improved. The top surface of three side back taper piece 220 is indent arc surface, and the low end of arc surface be located inboard and with main pile body 110 is connected, and its high-end is located the outside, therefore the top of side back taper piece 220 has formed a crotch structure similar to the indent, can resistance to plucking, prevents the slip casting pile come-up. The grouting pile can not easily rotate and float upwards, and the friction force of the cement soil solidified around the grouting pile can be continuously kept to be increased, so that the condition of uneven settlement can be avoided.

The included angle between the top surface of the side inverted cone block 220 and the pile body 100 is 60-80 degrees; the high-end point of the arc surface of the side inverted cone block 220 is connected with the circle center of the arc surface to form a straight line, the included angle between the straight line and the axis of the pile body 100 is 30-60 degrees, the anti-pulling effect of the three side inverted cone blocks 220 of the structure is optimal, and the grouting pile can be more stable.

The above is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent structures made by the contents of the specification and the drawings are directly or indirectly applied to other related technical fields, all the same principle is within the patent protection scope of the present invention.

Claims

1. The utility model provides a consolidate slip casting stake of soft soil foundation which characterized in that: the pile comprises a pile body and a pile head fixedly connected to the lower end of the pile body, wherein the pile body consists of a main pile body and at least three side pile bodies, the three side pile bodies are fixedly connected with the side wall of the main pile body, the three side pile bodies are partially overlapped with the main pile body, grouting pipes are arranged in the three side pile bodies, grouting pipe openings of the grouting pipes are positioned at the top ends of the side pile bodies, and grout outlet holes of the grouting pipes are distributed on the outer wall of the side pile body and are adjacent to the pile head; the pile head comprises main back taper head and at least three side back taper piece, main back taper head rigid coupling is in the lower extreme of main pile body, it is three incline the back taper piece all with the outer wall rigid coupling of main back taper head, and three the top surface of inclining the back taper piece respectively one by one with three incline pile body bottom surface rigid coupling, the top surface of inclining the back taper piece is the arc surface of indent, moreover the low side of arc surface be located inboard and with main pile body coupling, its high-end be located the outside, it is three the bottom of inclining the pile body all with the bottom of main back taper head is connected.

2. A slip casting pile for reinforcing soft soil foundation according to claim 1, characterized in that: the main pile body with the side pile body is the cylinder structure, and is cylindrical the diameter of side pile body is less than the diameter of main pile body, it is three the side pile body centers on the main pile body is equidistant interval distribution, and three cylindrical structure constitute a regular triangle after the centre of a circle of side pile body is connected.

3. A slip casting pile for reinforcing soft soil foundation according to claim 2, characterized in that: the grouting pipes in the side pile bodies are of an L-shaped structure, the circle centers of the grouting pipes and the side pile bodies are concentrically distributed, and the circle centers of the grouting pipes on the top surfaces of the three side pile bodies are connected to form a regular triangle.

4. A slip casting pile for reinforcing soft soil foundation according to claim 1, characterized in that: the included angle between the top surface of the side inverted cone block and the pile body is 60-80 degrees; the high-end point of the arc surface of the side inverted cone is connected with the circle center of the arc surface to form a straight line, and the included angle between the straight line and the axis of the pile body is 30-60 degrees.

5. A slip casting pile for reinforcing soft soil foundation according to claim 1, characterized in that: the outer side surface of the side inverted cone block is a convex arc surface.