CN114808944A - Grouting and expanding concrete-filled steel tubular column pile and its construction method - Google Patents

Abstract

The invention provides a grouting extruded and expanded concrete-filled steel tubular column pile and a construction method thereof. The grouted extruded and expanded concrete-filled steel tubular column pile comprises a concrete-filled steel tubular pile section and a concrete-filled steel tubular column section; the concrete-filled steel tubular pile section is implanted by drilling and grouting extrusion and expansion process construction, the outer peripheral wall of the CFST pile section forms a pile side area; when the steel pipe is implanted in the borehole, a mud replacement grouting pipe is attached for grouting the pile side area. The CFST pile section includes a grouting and expansion device, and the grouting and expansion device is located at the bottom of the CFST pile section. With this configuration, the side resistance of the CFST pile section is improved by replacing the mud on the side of the pile with cement slurry and grouting expansion; at the same time, the steel cage is used instead of the steel cage, which reduces the construction process, saves materials, and reduces the project cost; In addition, concrete grouting and pile side grouting can be carried out at the same time, which improves the construction efficiency.

Description

Grouting and expanding concrete-filled steel tubular column pile and its construction method

technical field

The invention relates to the technical field of civil engineering construction, in particular to a grouting squeeze-expanded concrete-filled steel tubular column pile and a construction method thereof.

Background technique

At present, there are two main types of column piles in foundation pit engineering: bored cast-in-place piles + lattice columns, bored cast-in-place piles + steel pipe piles. These two types of column piles use bored piles below the pit bottom, and lattice columns or steel pipe piles above the pit bottom. Lattice columns or steel pipe piles are implanted in bored piles, so the diameter of bored piles is required to be relatively large, generally not less than 800mm. In order to save the cost of the pile foundation, the diameter expansion technology is often used to expand the diameter of the pile within 5m below the pit bottom to 800mm. The construction process is complicated, the material consumption is large, and the project cost is high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a grouting extruding and expanding concrete-filled steel tubular column pile and a construction method thereof, so as to solve the problems of complicated construction procedures, large material consumption and high engineering cost of the existing foundation pit engineering column pile.

In order to achieve the above object, the present invention provides a grouting extrusion-expanded concrete-filled steel tubular column pile, which comprises: a column pile body and a mud replacement grouting pipe;

The column pile body comprises a concrete-filled steel tubular pile section, the concrete-filled steel tubular pile section is used for being accommodated in a borehole, and a pile side area is formed outside the outer peripheral wall of the concrete-filled steel tubular pile section;

The mud replacement grouting pipe is attached outside the outer peripheral wall of the concrete-filled steel pipe pile section, and is used for grouting to the pile side area.

Optionally, the concrete-filled steel tube pile section includes a grouting and expansion device, and the grouting and expansion device is located at the bottom of the concrete-filled steel tube pile section.

Optionally, the grouting and expansion device includes a grouting bag, and the grouting bag is attached to the outer side of the outer peripheral wall of the concrete-filled steel pipe pile section.

Optionally, the grouting and expansion device further includes a grouting pipe, the grouting pipe is attached outside the outer peripheral wall of the concrete-filled steel pipe pile section and is connected with the grouting bag, and is used for injecting the grouting into the bundle. The slurry bag is grouted to form the cement slurry extrusion section.

Optionally, the column pile body further includes a CFST column section, and the CFST column section is used to connect with a plurality of supporting devices of the foundation pit.

Optionally, the CFST column section and the CFST pile section are integrally provided.

In order to solve the above technical problems, the present invention also provides a construction method for grouting and expanding concrete-filled steel tubular column piles, which is applied to the above-mentioned grouting and expanding concrete-filled steel tubular column piles; Methods include:

Drilling in the ground to form a borehole, clearing the borehole;

installing the grouting extrusion and expansion device on the bottom of the steel pipe of the concrete-filled steel pipe pile section;

implanting the steel pipe of the CFST pile section, the grouting extrusion device and the mud replacement grouting pipe into the borehole;

Install a concrete pouring conduit inside the steel pipe of the concrete-filled steel pipe pile section, and carry out secondary hole cleaning;

Concrete is poured into the inside of the steel pipe of the concrete-filled steel tube pile section through the concrete pouring conduit, and at the same time, the pile side area is poured through the mud replacement pouring tube;

After the curing of the cement slurry in the pile side area is completed, grouting is carried out into the bundled slurry bag through a grouting pipe to form a squeezed and expanded section of the cement slurry at the bottom of the CFST pile section.

Optionally, the construction method of the concrete-filled steel tubular column pile by grouting extrusion and expansion further includes:

A plurality of supporting devices of the foundation pit are erected on the concrete-filled steel tubular column section.

Optionally, the curing time of the cement slurry in the pile side area is not less than 48h.

Optionally, a grouting pump is used for grouting into the grouting bag through the grouting pipe.

To sum up, in the grouting extrusion-expanded concrete-filled steel tubular column pile and its construction method provided by the present invention, the grouting extrusion-expanded concrete-filled steel tubular column pile comprises a column pile body and a mud replacement grouting pipe; the column pile body It includes a concrete-filled steel tube pile section, the concrete-filled steel tube pile section is used to be accommodated in a borehole, and a pile side area is formed outside the outer peripheral wall of the concrete-filled steel tube pile section; the mud replacement pipe is attached to the concrete-filled steel tube pile section outside the outer peripheral wall of the pile and is used for grouting the pile side area. The CFST pile section includes a grouting and expansion device, and the grouting and expansion device is located at the bottom of the CFST pile section.

In this configuration, the grouting pipe is used to replace the grouting pipe to the side area of the pile, which increases the side resistance of the CFST pile section; at the same time, the grouting and expansion device is used for grouting and expansion, so that the side resistance of the CFST pile section is further improved. On the other hand, the use of steel pipes instead of steel cages reduces the process of making steel cages, saves materials, and reduces engineering costs; in addition, concrete pouring and pile side grouting can be carried out at the same time, which improves construction efficiency.

Description of drawings

Fig. 1 is the schematic diagram of traditional column pile;

Fig. 2 is the schematic diagram of the concrete-filled steel tubular pile section before grouting according to the embodiment of the present invention;

3 is a schematic diagram of the concrete-filled steel tubular pile section after grouting according to the embodiment of the present invention;

4 is a schematic diagram of the column pile body after grouting according to the embodiment of the present invention;

Fig. 5 is the schematic diagram of step S1 in the construction method of the embodiment of the present invention;

Fig. 6 is the schematic diagram of step S2 in the construction method of the embodiment of the present invention;

Fig. 7 is the schematic diagram of step S3 in the construction method of the embodiment of the present invention;

Fig. 8 is the schematic diagram of step S4 in the construction method of the embodiment of the present invention;

Fig. 9 is the schematic diagram of step S5 in the construction method of the embodiment of the present invention;

FIG. 10 is a schematic diagram of step S6 in the construction method of the embodiment of the present invention.

Among them, the reference numerals are:

1- Column pile body; 2- Mud replacement grouting pipe; 3- Drilling hole; 4- Pile side area; 5- Support device; 6- Steel pipe column; - CFST column section; 100 - grouting expansion device; 1001 - grouting bag; 1002 - grouting pipe; 1003 - cement slurry extrusion and expansion section.

Detailed ways

In order to make the objects, advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, the emphasis needs to be shown in different drawings, and sometimes different scales are used.

As used in this specification, the singular forms "a," "an," and "the" include plural referents, the term "or" is generally employed in its sense including "and/or", and the term "a number" It is usually used in the sense including "at least one", the term "at least two" is usually used in the sense including "two or more", in addition, the terms "first", "the second" "Second" and "Third" are for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", "third" may expressly or implicitly include one or at least two of those features, "one end" and "the other end" and "proximal end" and "Distal" usually refers to two corresponding parts, which not only include end points, and the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two elements or the interaction relationship between the two elements. Furthermore, as used in this specification, the disposition of one element on another element generally only means that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the two elements may be directly or indirectly through intermediate elements. connection, coupling, cooperation or transmission, and should not be construed as indicating or implying the spatial positional relationship between two elements, that is, one element can be in any position inside, outside, above, below or on one side of the other element, unless the content Also clearly stated. The terms "upper", "lower", "top" and "bottom" usually refer to the relative positional relationship arranged in the direction of gravity; the terms "vertical and vertical" usually refer to the direction of gravity, which is generally perpendicular to the ground , "horizontal direction, horizontal plane direction" is usually along the direction parallel to the ground; for those of ordinary skill in the art, the specific meanings of the above terms in this specification can be understood according to specific situations.

The purpose of the present invention is to provide a grouting extruding and expanding concrete-filled steel tubular column pile and a construction method thereof, so as to solve the problems of complicated construction procedures, large material consumption and high engineering cost of the existing foundation pit engineering column pile.

The following description is made with reference to the accompanying drawings.

The inventor found that, as shown in FIG. 1, in the existing traditional column pile, the upper column and the lower pile are two-stage type, above the bottom of the foundation pit are lattice columns or steel pipe columns 6, and below the bottom of the foundation pit are drilled holes. For the cast-in-place pile 7, during the construction process, the steel pipe column 6 needs to be built into the bored cast-in-place pile 7, which increases the consumption of lap joint materials. At the same time, the processing workload of the reinforcement cage and the lattice column is large, and the number of on-site construction links is increased. , resulting in an increase in project cost.

Based on the above research, please refer to FIG. 2 to FIG. 4 , this embodiment provides a grouting extruded and expanded concrete-filled steel tubular column pile, which includes: a column pile body 1 and a mud replacement grouting pipe 2; the column pile body 1 includes a steel pipe The concrete pile section 10, the concrete-filled steel tube pile section 10 is used to be accommodated in the borehole 3, the outer peripheral wall of the concrete-filled steel tube pile section 10 forms the pile side area 4; the mud replacement grouting pipe 2 is attached to the Outside the outer peripheral wall of the CFST pile section 10 , it is used for grouting to the pile side area 4 . It should be noted that the CFST pile section 10 is constructed by drilling implantation and grouting extrusion process. In the exemplary examples shown in FIGS. 2 to 4 , the pile side area 4 refers to the outer circumference of the steel pipe of the CFST pile section 10 . The gap formed between the wall and the hole wall of the borehole 3. In other examples, the construction process of the CFST section 10 can also be other effective ways, and the position range of the pile side area 4 can also include the pile side Soil, the present invention is not limited to this. Those skilled in the art can understand that the borehole 3 is opened on the ground, and its diameter is larger than the outer diameter of the steel pipe of the CFST pile section 10, so as to facilitate the steel pipe, the grouting extrusion and expansion device 100 and the mud replacement grouting pipe of the CFST pile section 10 2's smooth devolution.

In this configuration, the grouting pipe 2 is used to replace the grouting pipe 2 to the pile side area 4, which increases the lateral resistance of the CFST pile section 10; at the same time, the use of steel pipes instead of steel cages reduces the process of making steel cages on site and optimizes the construction. In addition, in the construction process, concrete pouring and pile side grouting can be carried out at the same time, which improves the construction efficiency.

As a preferred embodiment, the CFST pile section 10 includes a grouting and expansion device 100 , and the grouting and expansion device 100 is located at the bottom of the CFST pile section 10 . In this configuration, the grouting and expansion device 100 forms the cement slurry extrusion and expansion section 1003 after the grouting and expansion, so as to increase the lateral resistance of the CFST pile section 10 . Of course, in some other embodiments, the grouting, squeezing and expanding device 100 may also be located in the middle of the concrete-filled steel tubular pile section, and those skilled in the art can configure the position of the grouting and squeezing and expanding device 100 according to the actual situation. limit.

Further, the grouting and expansion device 100 includes a slurry bag 1001 , and the slurry bag 1001 is attached to the outer side of the outer peripheral wall of the concrete-filled steel tube pile section 10 . It should be noted that, in the examples shown in FIGS. 2 to 4 , the number of pulp bags 1001 is one, and in some other embodiments, the number of pulp bags 1001 may also be two or more. It can be evenly arranged along the circumference of the CFST pile section 10, and the two adjacent slurry bags 1001 can also be connected to each other. Those skilled in the art can configure the number and arrangement of the slurry bags 1001 according to the actual situation. , the present invention is not limited to this.

Further, the grouting extrusion and expansion device 100 further includes a grouting pipe 1002, which is attached to the outside of the outer peripheral wall of the concrete-filled steel pipe pile section 10 and is connected with the grouting bag 1001. Then, the slurry bag 1001 is grouted to form the cement slurry extrusion and expansion section 1003 . In this configuration, grouting is carried out through the grouting pipe 1002 to the grouting bag 1001, and the grouting bag 1001 expands to the surroundings, squeezes the cement slurry in the pile side area 4 on the one hand, and squeezes the pile side soil of the CFST pile section 10 on the other hand. The body is extruded and expanded outward to form the cement slurry extruded and expanded section 1003, which effectively improves the bearing efficiency of the CFST pile section 10, and also effectively shortens the length and diameter of the pile.

Please refer to FIG. 4 , the column pile body 1 further includes a CFST column section 20 , and the CFST column section 20 is used for connecting with a plurality of supporting devices 5 of the foundation pit. In this configuration, the column pile body 1 includes a CFST pile section 10 and a CFST column section 20. The CFST pile section 10 is implanted in the borehole 3 below the bottom of the foundation pit, and the CFST column section 20 is located above the foundation pit bottom. Being connected with a plurality of supporting devices 5 avoids the need to insert lattice columns or steel pipe columns 6 into bored piles 7 in the prior art, optimizes construction procedures and improves construction efficiency.

Please continue to refer to FIG. 4 , the CFST column section 20 is integrally arranged with the CFST pile section 10 . In this configuration, the CFST pile section 10 and the CFST column section 20 are integrally arranged, eliminating the lap joint process of the lattice column or the steel pipe column 6 and the bored pile 7 in the prior art, saving materials and reducing engineering costs. cost.

Please refer to FIG. 1 and FIG. 5 to FIG. 10 , this embodiment also provides a construction method for grouting and expanding concrete-filled steel tubular column piles, which is applied to the above-mentioned grouting and expanding concrete-filled steel tubular column piles; The construction method of expanded steel tube concrete column pile includes:

Step S1: drilling on the ground to form a borehole 3, and clearing the borehole 3;

Step S2: installing the grouting extrusion and expansion device 100 on the bottom of the steel pipe of the CFST pile section 10;

Step S3: implanting the steel pipe of the CFST pile section 10, the grouting extrusion device 100 and the mud replacement pipe 2 into the borehole 3;

Step S4: installing a concrete pouring conduit inside the steel pipe of the CFST pile section 10, and performing secondary hole cleaning;

Step S5: pouring concrete into the inside of the steel pipe of the CFST pile section 10 through the concrete pouring conduit, and at the same time pouring grout into the pile side area 4 through the mud replacement grouting pipe 2;

Step S6 : After the cement slurry maintenance of the pile side area 4 is completed, grouting is performed into the grouting bag 1001 through the grouting pipe 1002 to form the cement slurry extrusion and expansion section 1003 at the bottom of the CFST pile section 10 .

It should be noted that, step S1 and step S2 do not limit the execution order between the steps, that is, they are not limited to be executed in sequence, and may also be executed out of sequence. In the examples shown in FIGS. 1 to 10 , the concrete pouring conduit is not shown. Those skilled in the art can understand that the concrete pouring conduit is a circular tube with a certain inner diameter, which is used for pouring concrete into the concrete-filled steel pipe pile. The interior of the segment 10, and in some other embodiments, the concrete pouring conduit can also be other components with the same function, which is not limited in the present invention.

In an alternative example, a drilling rig is used to drill on the ground to form a borehole 3; a crane is used to implant the steel pipe of the concrete-filled steel tube pile end 10, the grouting and expansion device 100, and the mud replacement grouting pipe 2 into the borehole 3 use the grouting pump to replace the grouting pipe 2 with the mud to grouting the pile side area 4; the two times of hole cleaning can be carried out in the way of positive circulation hole cleaning or reverse circulation hole cleaning. Those skilled in the art can understand that two The purpose of the secondary hole cleaning is to make the thickness of the pile bottom sediment meet the specification requirements. Of course, in some other embodiments, the components for completing the above steps may be other effective components, which is not limited in the present invention.

Further, the construction method of the concrete-filled steel tubular column pile by grouting extrusion and expansion also includes:

Step S7 : erecting the plurality of supporting devices 5 of the foundation pit on the CFST column section 20 .

It should be noted that, referring to FIG. 4 , after the cement slurry extrusion and expansion section 1003 is formed at the bottom of the CFST pile section 10, the CFST column section 20 integrated with it has been erected above the bottom of the foundation pit. Each supporting device 5 is erected on the CFST column section 20, and the CFST column section 20 can directly support the supporting device 5 to complete the supporting effect on the enclosure of the foundation pit.

As a preferred embodiment, the curing time of the cement slurry in the pile side area 4 is not less than 48 hours. It should be noted that the strength of the cement slurry in the pile side area 4 will be improved to a certain extent after the curing time of not less than 48h. 1003, the bearing performance of the CFST pile section 10 is further improved.

As a preferred embodiment, the slurry bag 1001 is grouted through the grouting pipe 1002 using a grouting pump. It should be noted that the grouting pump here needs to provide high pressure to inject the cement slurry into the grouting bag 1001 through the grouting pipe 1002, so as to squeeze and expand the cement slurry layer and soil body in the pile side area 4, and form the cement slurry extrusion and expansion section 1003 .

To sum up, in the grouting extrusion-expanded concrete-filled steel tubular column pile and the construction method thereof provided by the embodiments of the present invention, the grouting extrusion-expanded concrete-filled steel tubular column pile includes a column pile body and a mud replacement grouting pipe; the column The pile body includes a concrete-filled steel tube pile section, the concrete-filled steel tube pile section is used to be accommodated in a bore hole, and a pile side area is formed outside the outer peripheral wall of the concrete-filled steel tube pile section; the mud replacement grouting pipe is attached to the outside the outer peripheral wall of the concrete-filled steel tubular pile section, and for grouting the side area of the pile. The CFST pile section includes a grouting and expansion device, and the grouting and expansion device is located at the bottom of the CFST pile section.

With this configuration, the grouting pipe is used to replace the grouting pipe to the side area of the pile, which increases the lateral resistance of the CFST pile section. On the other hand, the use of steel pipes instead of steel cages reduces the process of making steel cages, saves materials, and reduces engineering costs; in addition, concrete pouring and pile side grouting can be carried out at the same time, which improves construction efficiency.

The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes and modifications made by those of ordinary skill in the field of the present invention according to the above disclosure all belong to the protection scope of the claims.

Claims (10)

1. A grouting extruding and expanding concrete-filled steel tubular column pile is characterized in that, comprising: a column pile body and a mud replacement grouting pipe; The column pile body comprises a concrete-filled steel tubular pile section, the concrete-filled steel tubular pile section is used for being accommodated in a borehole, and a pile side area is formed outside the outer peripheral wall of the concrete-filled steel tubular pile section; The mud replacement grouting pipe is attached outside the outer peripheral wall of the concrete-filled steel pipe pile section, and is used for grouting to the pile side area. 2 . The grouting and expansion concrete-filled steel tubular column pile according to claim 1 , wherein the concrete-filled steel tubular pile section comprises a grouting and expansion device, and the grouting and expansion device is located at the end of the concrete-filled steel tubular pile section. 3 . bottom. 3 . The grouting and expanding concrete-filled steel tubular column pile according to claim 2 , wherein the grouting and expanding device comprises a grouting bag, and the grouting bag is attached to the outer periphery of the CFST pile section. 4 . outside of the wall. 4 . The grouting and expanding concrete-filled steel tubular column pile according to claim 3 , wherein the grouting and expanding device further comprises a grouting pipe, and the grouting pipe is attached to the outer periphery of the CFST pile section. 5 . outside the wall and connected to the slurry bag for grouting the slurry bag to form a grout expansion section. 5. The grouting-expanded concrete-filled steel tubular column pile according to claim 1, wherein the column pile body further comprises a concrete-filled steel tubular column segment, and the concrete-filled steel tubular column segment is used for a plurality of supporting devices of the foundation pit. connect. 6 . The grouting extrusion-expanded concrete-filled steel tubular column pile according to claim 5 , wherein the concrete-filled steel tubular column section and the concrete-filled steel tubular pile section are integrally arranged. 7 . 7. A construction method for grouting and expanding concrete-filled steel tubular column piles, characterized in that it is applied to the grouting and expanding concrete-filled steel tubular column piles according to any one of claims 1 to 6; Concrete column pile construction methods include: Drilling in the ground to form a borehole, clearing the borehole; installing the grouting extrusion and expansion device on the bottom of the steel pipe of the concrete-filled steel pipe pile section; implanting the steel pipe of the CFST pile section, the grouting extrusion device and the mud replacement grouting pipe into the borehole; Install a concrete pouring conduit inside the steel pipe of the concrete-filled steel pipe pile section, and carry out secondary hole cleaning; Concrete is poured into the inside of the steel pipe of the concrete-filled steel tube pile section through the concrete pouring conduit, and at the same time, the pile side area is poured through the mud replacement pouring tube; After the curing of the cement slurry in the pile side area is completed, grouting is carried out into the bundled slurry bag through a grouting pipe to form a squeezed and expanded section of the cement slurry at the bottom of the CFST pile section. 8. The construction method for grouting and expanding concrete-filled steel tubular column piles according to claim 7, characterized in that, the construction method for grouting and expanding concrete-filled steel tubular column piles further comprises: A plurality of supporting devices of the foundation pit are erected on the concrete-filled steel tubular column section. 9 . The method for grouting and expanding concrete-filled steel tubular column piles according to claim 7 , wherein the curing time of the cement slurry in the pile side area is not less than 48h. 10 . 10 . The construction method of grouting extrusion-expanded concrete-filled steel tubular column pile according to claim 7 , wherein the grouting bag is grouted through the grouting pipe by using a grouting pump. 11 .

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