阅读说明：本技术 一种预制管桩的一次沉桩施工方法 (One-time pile sinking construction method for precast tubular pile ) 是由 *** 康明 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种预制管桩的一次沉桩施工方法,其包括以下步骤：S1、在预制管桩的两端端部安装下钢端板和上钢端板；S2、制作第一折板和第二折板；S3、将预制管桩水平放置在拼装工位上,并在预制管桩上安装第一、第二注浆支管；S4、在预制管桩上安装第一折板和第二折板；S5、将第一、第二注浆支管与第一折板和第二折板相连接,并安装注浆管；S6、利用沉桩设施将预制管桩垂直放置在沉桩工位上,并使第一、第二注浆支管和第一折板和第二折板位于底部；S7、在上钢端板上放置盖板,将传动轴兼注浆管穿过盖板后与注浆管相连接等,本发明能使预制管桩的沉桩、扩底及桩周加固作业一次完成,节省了施工成本,加快施工进度。(The invention discloses a one-time pile sinking construction method of a precast tubular pile, which comprises the following steps of: s1, mounting a lower steel end plate and an upper steel end plate at the end parts of the two ends of the precast tubular pile; s2, manufacturing a first folded plate and a second folded plate; s3, horizontally placing the precast tubular pile on an assembling station, and installing a first grouting branch pipe and a second grouting branch pipe on the precast tubular pile; s4, mounting a first folded plate and a second folded plate on the precast tubular pile; s5, connecting the first grouting branch pipe and the second grouting branch pipe with the first folded plate and the second folded plate, and installing grouting pipes; s6, vertically placing the precast tubular pile on a pile sinking station by using a pile sinking facility, and enabling the first grouting branch pipe, the second grouting branch pipe, the first folded plate and the second folded plate to be positioned at the bottom; s7, placing a cover plate on the upper steel end plate, connecting the transmission shaft and the grouting pipe with the grouting pipe after penetrating through the cover plate, and the like.)

1. A one-time pile sinking construction method of a precast tubular pile is characterized by comprising the following steps:

s1, mounting a lower steel end plate (11) and an upper steel end plate (12) at the end parts of the two ends of the precast tubular pile (1);

s2, manufacturing a first folded plate (2) and a second folded plate (3);

s3, horizontally placing the precast tubular pile (1) on an assembling station, and installing a first grouting branch pipe and a second grouting branch pipe (42 and 43) on the precast tubular pile (1);

s4, installing the first folded plate (2) and the second folded plate (3) on the precast tubular pile (1);

s5, connecting the first grouting branch pipe and the second grouting branch pipe (42, 43) with the first folded plate (2) and the second folded plate (3), and installing a grouting pipe (4);

s6, vertically placing the precast tubular pile (1) on a pile sinking station by using a pile sinking facility, and enabling the first grouting branch pipe (42), the second grouting branch pipe (43), the first folding plate (2) and the second folding plate (3) to be located at the bottom;

s7, placing a cover plate (51) on the upper steel end plate (12), and connecting a transmission shaft and grouting pipe (52) with the grouting pipe (4) after penetrating through the cover plate (51);

s8, driving the precast tubular pile (1) to rotate and sink downwards by using the transmission shaft and grouting pipe (52) and the cover plate (51), simultaneously injecting cement-based grout into a soil body through the first grouting branch pipe and the second grouting branch pipe (42 and 43), and stirring the cement-based grout by the first folded plate (2) and the second folded plate (3) to mix with the soil body around the precast tubular pile (1) to form cement soil (6);

s9, sinking the precast tubular pile (1) to a preset depth, then continuing rotating and pressing for 1-10 weeks, and then forming a holding pier of the cement soil (6) under the lower steel end plate (11), the first folded plate (2) and the second folded plate (3);

s10, after pile sinking of the precast tubular pile (1) is completed, the grouting pipe (4) is dismantled, and the transmission shaft and grouting pipe (52) and the cover plate (51) are removed.

2. The primary pile sinking construction method of the precast tubular pile according to claim 1, wherein in the step S1, the material of the precast tubular pile (1) is prestressed concrete or steel pipe concrete, the outer diameter of the precast tubular pile (1) is not less than 400mm and not more than 1500mm, the inner diameter of the precast tubular pile (1) is not less than 1/2 of the outer diameter thereof, and the length of the precast tubular pile (1) is not less than 8m and not more than 80 m; the material of lower steel end plate (11) and last steel end plate (12) is low carbon steel, down the inside and outside diameter of steel end plate (11) and last steel end plate (12) with the inside and outside diameter of precast tubular pile (1) is the same, the thickness of steel end plate (11) and last steel end plate (12) is not less than 18mm and is not more than 40mm down.

3. The primary pile sinking construction method of the precast tubular pile according to claim 1, wherein in the step S2, the first and second folded plates (2, 3) are made of rectangular steel plates of low carbon steel or low alloy steel, each rectangular steel plate has a width not less than an inner diameter of the precast tubular pile (1) and not more than an outer diameter thereof, a length not less than an outer diameter of the precast tubular pile (1) and not more than 3 times the outer diameter thereof, and a thickness not less than 8mm and not more than 18 mm;

the method for bending the first and second flaps (2, 3) comprises: the two rectangular steel plates are respectively bent into double planes by taking diagonal lines in the same direction as boundary lines, the first folded plate (2) and the second folded plate (3) are identical in size and have equal plane included angles, and the included angles of the planes of the first folded plate (2) and the second folded plate (3) are not less than 140 degrees and not more than 170 degrees.

4. The method for one-time pile sinking construction of precast tubular pile according to claim 3, wherein in step S3, the first and second grouting branch pipes (42, 43) are symmetrically arranged on both sides of the central axis of the precast tubular pile (1), the first and second grouting branch pipes (42, 43) are fixed on the lower surface of the lower steel end plate (11), the first and second grouting branch pipes (42, 43) are connected through the grouting pipe joint (41), and the grouting pipe joint (41) is arranged on the central axis of the precast tubular pile (1); the lengths of the first grouting branch pipe and the second grouting branch pipe (42 and 43) are not less than the outer diameter of the precast tubular pile (1) and not more than 3 times of the outer diameter, and the inner diameters of the first grouting branch pipe and the second grouting branch pipe (42 and 43) are not less than 20mm and not more than 60 mm; the inner diameter of the grouting pipe joint (41) is not less than the inner diameters of the first grouting branch pipe (42) and the second grouting branch pipe (43); the grouting pipe joint (41), the first grouting branch pipe (42) and the second grouting branch pipe (43) are made of low-carbon steel.

5. The primary pile sinking construction method of the precast tubular pile according to claim 3 or 4, wherein the first and second flaps (2, 3) are symmetrically disposed at the lower steel end plate (11) with respect to the central axis of the precast tubular pile (1) in step S4, wherein the first and second flaps (2, 3) are fixedly welded to the surface of the lower steel end plate (11) near a plane where the central axis of the precast tubular pile (1) has a relatively small acute angle, and the remaining planes of the first and second flaps (2, 3) are tilted, wherein short sides of the tilted planes of the first and second flaps (2, 3) are close to each other.

6. The primary pile sinking construction method of precast tubular pile according to claim 4, wherein in the step S5, a first grouting branch pipe (42) and a second grouting branch pipe (43) are fixedly connected with the first folding plate (2) and the second folding plate (3), respectively, and a grouting pipe (4) is connected with a grouting pipe joint (41) through the inner hole of the precast tubular pile (1), wherein the length of the grouting pipe (4) is not less than that of the precast tubular pile (1), and the inner diameter of the grouting pipe (4) is not less than that of the grouting pipe joint (41).

7. The one-time pile sinking construction method of the precast tubular pile according to claim 1, wherein in the step S7, the cover plate (51) is made of low alloy steel, the outer diameter of the cover plate is not less than the outer diameter of the upper steel end plate (12), the thickness of the cover plate (51) is not less than the thickness of the upper steel end plate (12), the lower surface of the cover plate (51) is provided with a plurality of convex teeth, the upper surface of the upper steel end plate (12) is provided with a plurality of bolt holes, and the convex teeth are correspondingly matched with the bolt holes; and a regular polygon hole is arranged in the center of the cover plate (51), and the transmission shaft and grouting pipe (52) penetrates through the regular polygon hole and then is connected with the grouting pipe (4).

8. The primary pile sinking construction method of the precast tubular pile according to claim 1, wherein in the step S8, the cement-based grout consists of water and powdery solid cement, and the weight ratio of the water to the powdery solid cement is 0.3-0.6; the grouting pressure of the cement-based grout is 1.2-3.6 times of the water pressure of a soil layer, and the rotating speed of the transmission shaft and the grouting pipe (52) is 0.1-1 week/minute; the vertical downward pressure is applied to be 0.1-1 times of the ultimate bearing capacity of the precast tubular pile (1).

Technical Field

The invention relates to the technical field of construction methods of precast tubular piles, in particular to a one-time pile sinking construction method of a precast tubular pile.

Background

Disclosure of Invention

The invention mainly solves the technical problems in the prior art, and provides a one-time pile sinking construction method of a precast tubular pile, which has high pile sinking efficiency and low construction cost.

The technical problem of the invention is mainly solved by the following technical scheme:

the invention provides a one-time pile sinking construction method of a precast tubular pile, which is characterized by comprising the following steps of:

s1, mounting a lower steel end plate and an upper steel end plate at the end parts of the two ends of the precast tubular pile;

s2, manufacturing a first folded plate and a second folded plate;

s3, horizontally placing the precast tubular pile on an assembling station, and installing a first grouting branch pipe and a second grouting branch pipe on the precast tubular pile;

s4, mounting the first folded plate and the second folded plate on the precast tubular pile;

s5, connecting the first grouting branch pipe and the second grouting branch pipe with the first folded plate and the second folded plate, and installing grouting pipes;

s6, vertically placing the precast tubular pile on a pile sinking station by using a pile sinking facility, and enabling the first grouting branch pipe, the second grouting branch pipe, the first folded plate and the second folded plate to be positioned at the bottom;

s7, placing a cover plate on the upper steel end plate, and connecting a transmission shaft and a grouting pipe with the grouting pipe after penetrating through the cover plate;

s8, driving the precast tubular pile to rotate and sink downwards by using the transmission shaft, namely the grouting pipe and the cover plate, simultaneously injecting cement-based grout into a soil body through the first grouting branch pipe and the second grouting branch pipe, and stirring the cement-based grout by the first folded plate and the second folded plate to mix the cement-based grout with the soil body around the precast tubular pile to form cement soil;

s9, sinking the precast tubular pile to a preset depth, continuing rotating and pressing for 1-10 weeks, and forming a holding pier of cement soil under the lower steel end plate, the first folded plate and the second folded plate;

and S10, after pile sinking of the precast tubular pile is completed, removing the grouting pipe, and removing the transmission shaft, the grouting pipe and the cover plate.

Further, in the step S1, the prefabricated pipe pile is made of prestressed concrete or steel pipe concrete, an outer diameter of the prefabricated pipe pile is not less than 400mm and not more than 1500mm, an inner diameter of the prefabricated pipe pile is not less than 1/2 of the outer diameter of the prefabricated pipe pile, and a length of the prefabricated pipe pile is not less than 8m and not more than 80 m; the material of lower steel end plate and last steel end plate is low carbon steel, down the inside and outside diameter of steel end plate and last steel end plate with the inside and outside diameter of precast tubular pile is the same, down the thickness of steel end plate and last steel end plate is not less than 18mm and is not more than 40 mm.

Further, in step S2, the first folded plate and the second folded plate are made of rectangular steel plates made of low carbon steel or low alloy steel, the width of each rectangular steel plate is not less than the inner diameter of the precast tubular pile and not more than the outer diameter thereof, the length of each rectangular steel plate is not less than the outer diameter of the precast tubular pile and not more than 3 times of the outer diameter thereof, and the thickness of each rectangular steel plate is not less than 8mm and not more than 18 mm;

the method of folding the first and second flaps comprises: the two rectangular steel plates are respectively bent into double planes by taking the diagonal line in the same direction as a boundary line, the first folded plate and the second folded plate are identical in size and have equal plane included angles, and the included angles of the planes of the first folded plate and the second folded plate are not less than 140 degrees and not more than 170 degrees.

Further, in step S3, symmetrically arranging first and second grouting branch pipes on two sides of the central axis of the precast tubular pile, the first and second grouting branch pipes being fixed to the lower surface of the lower steel end plate, the first and second grouting branch pipes being connected by a grouting pipe joint, the grouting pipe joint being arranged on the central axis of the precast tubular pile; the lengths of the first grouting branch pipe and the second grouting branch pipe are not less than the outer diameter of the precast tubular pile and not more than 3 times of the outer diameter, and the inner diameters of the first grouting branch pipe and the second grouting branch pipe are not less than 20mm and not more than 60 mm; the inner diameter of the grouting pipe connector is not smaller than the inner diameters of the first grouting branch pipe and the second grouting branch pipe; the grouting pipe joint, the first grouting branch pipe and the second grouting branch pipe are made of low-carbon steel.

Further, in step S4, the first folded plate and the second folded plate are symmetrically disposed at the lower steel end plate with respect to the central axis of the precast tubular pile, wherein the first folded plate and the second folded plate are fixedly welded to the surface of the lower steel end plate near a plane where the central axis of the precast tubular pile has a smaller acute angle, and the remaining planes of the first folded plate and the second folded plate are tilted, wherein short sides of the tilted planes of the first folded plate and the second folded plate are close to each other.

Further, in step S5, the first and second grouting branch pipes are respectively fixedly connected to the first folding plate and the second folding plate, and the grouting pipe passes through the inner hole of the precast tubular pile and is connected to the grouting pipe joint, wherein the length of the grouting pipe is not less than the length of the precast tubular pile, and the inner diameter of the grouting pipe is not less than the inner diameter of the grouting pipe joint.

Further, in step S7, the cover plate is made of low alloy steel, the outer diameter of the cover plate is not smaller than the outer diameter of the upper steel end plate, the thickness of the cover plate is not smaller than the thickness of the upper steel end plate, a plurality of convex teeth are arranged on the lower surface of the cover plate, a plurality of bolt holes are arranged on the upper surface of the upper steel end plate, and the convex teeth are correspondingly matched with the bolt holes; and a regular polygon hole is arranged in the center of the cover plate, and the transmission shaft and the grouting pipe penetrate through the regular polygon hole and then are connected with the grouting pipe.

Further, in the step S8, the cement-based slurry is composed of water and powdered solid cementing material, and the weight ratio of the water to the powdered solid cementing material is 0.3-0.6; the grouting pressure of the cement-based slurry is 1.2-3.6 times of the water pressure of a soil layer, and the rotating speed of the transmission shaft and the grouting pipe is 0.1-1 week/minute; the vertical downward pressure is applied to be 0.1-1 times of the ultimate bearing capacity of the precast tubular pile.

The invention has the beneficial effects that: the prefabricated pipe pile is driven to rotate and sink downwards through the transmission shaft, the grouting pipe and the cover plate, meanwhile, the first grouting branch pipe and the second grouting branch pipe inject cement-based slurry into a soil body, the first folded plate and the second folded plate stir the cement-based slurry to be mixed with the soil body around the prefabricated pipe pile to form cement soil, pile sinking, bottom expanding and pile periphery reinforcing operation of the prefabricated pipe pile can be completed at one time, construction cost is saved, and construction progress is accelerated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a position distribution diagram of a grouting pipe joint, a second grouting branch pipe, a first folded plate and a second folded plate on a precast tubular pile according to the invention;

fig. 2 is a sectional view showing the position distribution of the precast tubular pile, the grouting pipe joint, the second grouting branch pipe, the first folded plate and the second folded plate in pile sinking according to the present invention;

FIG. 3 is a bottom view of FIG. 1 of the present invention;

FIG. 4 is a bottom view of FIG. 2 of the present invention;

FIG. 5 is a map of the location of a first slip casting manifold according to the present invention;

FIG. 6 is a position profile of the cover plate and the driveshaft/grout tube of the present invention;

FIG. 7 is a schematic structural view of the cover plate of the present invention;

FIG. 8 is a schematic structural view of the upper steel end plate of the present invention;

fig. 9 is a state view of a pile sinking process of the precast tubular pile of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.

Referring to fig. 1 to 9, the one-time pile sinking construction method of the precast tubular pile of the present invention includes the following steps:

s1, mounting a lower steel end plate 11 and an upper steel end plate 12 at the end parts of the two ends of the precast tubular pile 1;

s2, manufacturing a first folding plate 2 and a second folding plate 3;

s3, horizontally placing the precast tubular pile 1 on an assembling station, and installing a first grouting branch pipe and a second grouting branch pipe (42 and 43) on the precast tubular pile 1;

s4, mounting a first folded plate 2 and a second folded plate 3 on the precast tubular pile 1;

s5, connecting the first grouting branch pipe and the second grouting branch pipe (42 and 43) with the first folding plate 2 and the second folding plate 3, and installing the grouting pipes 4;

s6, vertically placing the precast tubular pile 1 on a pile sinking station by using a pile sinking facility, and enabling the first grouting branch pipe (42) and the second grouting branch pipe (43) and the first folding plate 2 and the second folding plate 3 to be positioned at the bottom;

s7, placing a cover plate 51 on the upper steel end plate 12, and connecting the transmission shaft and grouting pipe 52 with the grouting pipe 4 after penetrating through the cover plate 51;

s8, driving the precast tubular pile 1 to rotate and sink downwards by using the transmission shaft and grouting pipe 52 and the cover plate 51, simultaneously injecting cement-based grout into a soil body through the first grouting branch pipe and the second grouting branch pipe (42 and 43), and mixing the cement-based grout and the soil body around the precast tubular pile 1 into cement soil 6 by stirring the cement-based grout through the first folding plate 2 and the second folding plate 3;

s9, after the prefabricated pipe pile 1 is immersed to a preset depth, the prefabricated pipe pile continues to rotate and press down for 1-10 weeks, and then a holding pier of cement soil 6 is formed under the lower steel end plate 11, the first folding plate 2 and the second folding plate 3;

s10, after the pile sinking of the precast tubular pile 1 is completed, the grouting pipe 4 is removed, and the driving shaft and grouting pipe 52 and the cover plate 51 are removed.

Specifically, in step S1, the precast tubular pile 1 is made of prestressed concrete or steel pipe concrete, the outer diameter of the precast tubular pile 1 is not less than 400mm and not more than 1500mm, the inner diameter of the precast tubular pile 1 is not less than 1/2 of the outer diameter thereof, and the length of the precast tubular pile 1 is not less than 8m and not more than 80 m; the material of lower steel end plate 11 and upper steel end plate 12 is low carbon steel, and the inside and outside diameter of lower steel end plate 11 and upper steel end plate 12 is the same with the inside and outside diameter of precast tubular pile 1, and the thickness of lower steel end plate 11 and upper steel end plate 12 is not less than 18mm and is not more than 40 mm.

Preferably, in step S2, the first folding plate 2 and the second folding plate 3 are made of rectangular steel plates made of low-carbon steel or low-alloy steel, the width of each rectangular steel plate is not less than the inner diameter of the precast tubular pile 1 and not more than the outer diameter thereof, the length of each rectangular steel plate is not less than the outer diameter of the precast tubular pile 1 and not more than 3 times of the outer diameter thereof, and the thickness of each rectangular steel plate is not less than 8mm and not more than 18 mm;

the bending method of the first folding plate 2 and the second folding plate 3 comprises the following steps: the two rectangular steel plates are respectively bent into double planes by taking diagonal lines in the same direction as boundary lines, the first folding plate 2 and the second folding plate 3 are identical in size and have equal plane included angles, and the included angles of the planes of the first folding plate 2 and the second folding plate 3 are not less than 140 degrees and not more than 170 degrees.

Further, in step S3, symmetrically arranging first and second grouting branch pipes (42, 43) on two sides of the central axis of the precast tubular pile 1, wherein the first and second grouting branch pipes (42, 43) are fixed on the lower surface of the lower steel end plate 11, the first and second grouting branch pipes (42, 43) are connected through a grouting pipe connector 41, and the grouting pipe connector 41 is arranged on the central axis of the precast tubular pile 1; the lengths of the first grouting branch pipe and the second grouting branch pipe (42 and 43) are not less than the outer diameter of the precast tubular pile 1 and not more than 3 times of the outer diameter, and the inner diameters of the first grouting branch pipe and the second grouting branch pipe (42 and 43) are not less than 20mm and not more than 60 mm; the inner diameter of the grouting pipe joint 41 is not smaller than the inner diameters of the first and second grouting branch pipes ((42, 43)); the grouting pipe joint 41, the first grouting branch pipe 42 and the second grouting branch pipe 43 are made of low-carbon steel.

Specifically, in step S4, the first folded plate 2 and the second folded plate 3 are symmetrically disposed at the lower steel end plate 11 with respect to the central axis of the precast tubular pile 1, wherein the first folded plate 2 and the second folded plate 3 are fixedly welded to the surface of the lower steel end plate 11 near a plane where the central axis of the precast tubular pile 1 has a smaller acute angle, the remaining planes of the first folded plate 2 and the second folded plate 3 are tilted, and short sides of the tilted planes of the first folded plate 2 and the second folded plate 3 are close to each other.

In step S5 of the present invention, the first and second grouting branch pipes (42, 43) are fixedly connected to the first folding plate 2 and the second folding plate 3, respectively, to control the tilt angle of the first folding plate 2 and the second folding plate 3 and to enhance the rigidity of the first folding plate 2 and the second folding plate 3. And (3) connecting the grouting pipe 4 with the grouting pipe interface 41 by penetrating the inner hole of the precast tubular pile 1, wherein the length of the grouting pipe 4 is not less than that of the precast tubular pile 1, and the inner diameter of the grouting pipe 4 is not less than that of the grouting pipe interface 41.

In step S7, the cover plate 51 is made of low alloy steel, the outer diameter of the cover plate 51 is not smaller than the outer diameter of the upper steel end plate 12, the thickness of the cover plate 51 is not smaller than the thickness of the upper steel end plate 12, a plurality of convex teeth are arranged on the lower surface of the cover plate 51, a plurality of bolt holes are arranged on the upper surface of the upper steel end plate 12, and the convex teeth are correspondingly matched with the bolt holes; and a regular polygonal hole is formed in the center of the cover plate 51, and the transmission shaft/grouting pipe 52 is connected with the grouting pipe 4 after passing through the regular polygonal hole.

Preferably, in step S8, the cement-based slurry is composed of water and powdered solid cement, wherein the weight ratio of the water to the powdered solid cement is 0.3-0.6; the grouting pressure of the cement-based grout is 1.2-3.6 times of the water pressure of a soil layer, and the rotating speed of the transmission shaft and grouting pipe 52 is 0.1-1 week/minute; the vertical downward pressure is applied to be 0.1-1 times of the ultimate bearing capacity of the precast tubular pile 1.