Precast pile for soft soil foundation and construction method

Abstract

The invention discloses a precast pile for a soft soil foundation and a construction method, and belongs to the field of precast piles, the precast pile comprises a pile body, the two ends of the pile body comprise end heads, each end head comprises more than three continuous groups of matching parts, and each matching part comprises a concave section and a convex section; and the concave section of the matching part on the end head of one pile body is matched with the convex section of the matching part on the end head of the other pile body. The end of one pile body is matched with the end of the other pile body, in the matched state, an opening a1 in the end of one pile body coincides with an opening a2 in the end of the other pile body, and a first matching groove in the end of one pile body and a second matching groove in the end of the other pile body form a third matching groove. A locking piece is installed in the third matching groove in a matched mode. The prefabricated assembly type connecting joint of the prefabricated pile of the soft soil foundation is convenient to construct and firm and reliable in connection, the pile side resistance can be effectively improved in a deep and thick soft soil area, and the single-pile bearing capacity is improved.

Description

Technical Field

[0001] The invention belongs to the field of prefabricated piles, and specifically relates to a prefabricated pile for a soft soil foundation and a construction method. Background Art

[0002] At present, pile foundation, as the most common form of deep foundation, has been widely used in industrial and civil buildings, roads, bridges and port projects, mainly in the pile foundation construction of bridges and high-rise buildings. Piles are divided into cast-in-place piles and precast piles, each of which has its own advantages and disadvantages. Precast piles, especially prestressed concrete piles, have gradually gained favor in the engineering industry due to their advantages such as fast construction speed, reliable quality, cost savings, and strong bearing capacity. Most construction projects give priority to the use of precast piles, especially reinforced concrete precast piles.

[0003] Precast reinforced concrete piles have strong technical advantages, such as strong load capacity, small settlement deformation, and high efficiency, and are widely used in most construction projects. According to statistics from the China Concrete and Cement Products Association, the national precast pile output exceeded 400 million cubic meters in 2022, and the annual precast pile output value exceeded 100 billion, ranking first in the world in both production and use. These data show the widespread application and development of precast pile technology in my country.

[0004] Although reinforced concrete piles have many advantages, they also face some challenges in practical applications. For example, in deep soft soil areas, how to design a more suitable pile body section and shape, effectively improve the pile side resistance, and improve the single pile bearing capacity is a hot issue of common concern to precast pile manufacturers, owners, designers, and construction units. Before pile foundation construction, the natural soil is in a stable stress field. Due to the violent disturbance of the penetration pile on the soil, the soil structure will be destroyed and a high excess pore water pressure will be generated. Since piling is an instantaneous action, but drainage requires sufficient time, the action between the two does not occur synchronously, which generates a lot of lateral pressure.

[0005] Conventional pile foundation construction usually uses simple welding connections, which mainly provide vertical bearing capacity but little lateral resistance, making it easy for pile breakage accidents to occur during pile foundation construction on soft soil. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a prefabricated pile for soft soil foundation and a construction method to solve the problems mentioned in the background technology or achieve better technical effects.

[0007] In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention discloses a prefabricated pile for soft soil foundation, including a pile body, both ends of the pile body include end heads, the end heads include more than three consecutive groups of matching parts, the matching parts include concave sections and convex sections, and the concave section of the matching part on the end head of one pile body and the convex section of the matching part on the end head of another pile body are suitable for mutual matching;

[0008] The concave section comprises a matching groove 1, which extends from the end surface of the concave section in the length direction of the pile body, and the width of the opening a1 of the matching groove 1 located at the bottom surface of the concave section is smaller than the width of the widest opening b1 of the matching groove 1 located in the direction perpendicular to the length of the pile body;

[0009] The convex section includes a second matching groove, which extends from the end surface of the convex section in the length direction of the pile body, and the width of the opening a2 of the second matching groove located at the end surface of the convex section is smaller than the width of the widest opening b2 of the second matching groove located in the direction perpendicular to the length of the pile body;

[0010] The end of one pile body matches with the end of the other pile body. In the matching state, the opening a1 on the end of one pile body coincides with the opening a2 on the end of the other pile body, and the matching groove 1 on the end of one pile body and the matching groove 2 on the end of the other pile body form a matching groove 3.

[0011] A locking piece is adapted to be installed in the matching groove three.

[0012] Preferably, the locking member comprises a top surface, a bottom surface, two end surfaces and two side surfaces;

[0013] When the end of one pile body cooperates with the end of another pile body and a locking piece is installed in the matching groove three, the top surface does not protrude from the outer surface of the end, the bottom surface fits with the bottom of the matching groove three, the two end surfaces fit with the two end surfaces of the matching groove three in the length direction of the pile body, and the two side surfaces fit with the two side surfaces of the matching groove three.

[0014] Preferably, the top surface is in the shape of an arc, which is concentric with the arc of the outer surface of the end head.

[0015] Preferably, the end of one pile body cooperates with the end of another pile body and the locking piece is installed in the third matching groove, and the top surface and the outer surface of the end are located on the same arc surface. In this solution, the outer surface of the end is flat when the locking piece is installed in the third matching groove, reducing the resistance during the piling process.

[0016] Preferably, a waterproof pad is arranged between the bottom surface and the bottom of the matching groove 3. The waterproof performance of this solution is significantly improved.

[0017] Preferably, in some embodiments, a connecting groove, a connecting step and a fastening bolt are included.

[0018] The connecting groove is located at two vertex corners of the convex section of the matching part at one end of the pile body, and a threaded hole is provided at the bottom of the connecting groove;

[0019] The connecting step extends from the side of the convex section of the matching part at the other end of the pile body toward the concave section, and a through hole is provided on the connecting step;

[0020] When the end of one pile body cooperates with the end of another pile body, the connection groove and the connection step fit each other and the threaded hole and the through hole are opposite to each other;

[0021] The fastening bolt passes through the through hole and cooperates with the threaded hole.

[0022] Preferably, the head of the fastening bolt does not protrude from the outer surface of the end head, and the gap between the head of the fastening bolt and the outer surface of the end head is filled with anti-corrosion and waterproof filler.

[0023] The present invention also discloses a method for constructing prefabricated piles for soft soil foundation, including a prefabricated pile for soft soil foundation, wherein the end of one pile body is coated with an anti-corrosion and waterproof adhesive coating before the end of the pile body is matched with the end of the other pile body. The waterproof performance of this solution is significantly improved.

[0024] Compared with the prior art, the present invention can achieve the following technical effects:

[0025] The prefabricated assembled connection node of the prefabricated piles on the soft soil foundation of the present invention is easy to construct and has a firm and reliable connection. It can effectively increase the pile side resistance in deep soft soil areas, improve the bearing capacity of a single pile, and greatly reduce the occurrence of broken pile accidents in pile foundation construction on soft soil foundations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a three-dimensional schematic diagram of a prefabricated pile for a soft soil foundation in Example 1;

[0028] Figure 2 It is a three-dimensional schematic diagram of the coordination state of prefabricated piles for soft soil foundation in Example 1.

[0029] Figure 3 Schematic diagram of the locking member of Example 1.

[0030] Figure 4 It is a three-dimensional schematic diagram of a prefabricated pile for soft soil foundation of Example 2.

[0031] Figure 5It is a three-dimensional schematic diagram from another angle of a prefabricated pile for a soft soil foundation of Example 2.

[0032] Figure 6 It is a three-dimensional schematic diagram of the coordination state of prefabricated piles for soft soil foundation in Example 2.

[0033] In the figure: 1. Pile body 1, 2. Pile body 2, 3. End 1, 4. End 2, 5. Concave section, 6. Matching groove 1, 7. Convex section, 8. Matching groove 2, 9. Locking piece, 91. End face, 92. Side face, 93. Top face, 10. Hollow hole, 11. Connecting step, 12. Through hole, 13. Connecting groove, 14. Threaded hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] like Figure 1-3 Shown:.

[0038] A prefabricated pile for soft soil foundation, comprising a pile body, wherein both ends of the pile body comprise end caps, wherein the end caps comprise three consecutive sets of matching parts, wherein the matching parts comprise a concave section 5 and a convex section 7, wherein the concave section 5 of the matching part at the end cap of one pile body and the convex section 7 of the matching part at the end cap of another pile body are adapted to match each other;

[0039] The concave section 5 comprises a matching groove 6, which extends from the end surface of the concave section 5 in the length direction of the pile body, and the width of the opening a1 of the matching groove 6 located at the bottom surface of the concave section 5 is smaller than the width of the widest opening b1 of the matching groove 6 located in the direction perpendicular to the length of the pile body;

[0040] The convex section 7 includes a second matching groove 8, which extends from the end surface of the convex section 7 in the length direction of the pile body, and the width of the opening a2 of the second matching groove 8 located at the end surface of the convex section 7 is smaller than the width of the widest opening b2 of the second matching groove 8 located in the direction perpendicular to the length of the pile body;

[0041] Specific:

[0042] The end 13 of the pile body 1 and the end 24 of the pile body 2 cooperate with each other. In this cooperation state, the opening a1 on the end 13 of the pile body 1 coincides with the opening a2 on the end 24 of the pile body 2, and the matching groove 16 on the end 13 of the pile body 1 and the matching groove 28 on the end 24 of the pile body 2 form a matching groove 3;

[0043] A locking member 9 is adapted to be installed in the matching groove 3.

[0044] The locking member 9 includes a top surface 93, a bottom surface, two end surfaces 91 and two side surfaces 92;

[0045] When the end of one pile body cooperates with the end of the other pile body and the locking piece 9 is installed in the matching groove three, the top surface 93 does not protrude from the outer surface of the end, the bottom surface is in contact with the bottom of the matching groove three, the two end surfaces 91 are in contact with the two end surfaces of the matching groove three in the length direction of the pile body, and the two side surfaces 92 are in contact with the two side surfaces of the matching groove three.

[0046] The top surface 93 is in an arc shape, which is concentric with the arc of the outer surface of the end.

[0047] In some embodiments, when the end of one pile body cooperates with the end of another pile body and the locking member 9 is installed in the cooperation groove 3, the top surface 93 and the outer surface of the end are located on the same arc surface.

[0048] In some embodiments, a waterproof pad is provided between the bottom surface and the bottom of the matching groove.

[0049] As a variation of Example 1, the matching parts may also be four groups, five groups, six groups, etc.

[0050] Example 2

[0051] like Figure 4-6 As shown: Embodiment 2 differs from Embodiment 1 in that:

[0052] It also includes a connecting groove 13, a connecting step 11 and a fastening bolt.

[0053] The connecting groove 13 is located at two vertex corners of the convex section 7 of the matching portion at one end of the pile body, and a threaded hole 14 is provided at the bottom of the connecting groove 13;

[0054] The connecting step 11 extends from the side of the convex section 7 of the matching part at the other end of the pile body toward the concave section 5, and the connecting step 11 is provided with a through hole 12;

[0055] When the end of one pile body and the end of another pile body are in a state of mutual cooperation, the connecting groove 13 and the connecting step 11 are mutually fitted and the threaded hole 14 is opposite to the through hole 12;

[0056] The fastening bolt passes through the through hole 12 and cooperates with the threaded hole 14 .

[0057] In some embodiments: the head of the fastening bolt does not protrude from the outer surface of the end head, and the gap between the head of the fastening bolt and the outer surface of the end head is filled with an anti-corrosion and waterproof filler.

[0058] In the above embodiments, the middle portion of the end cap includes a hollow hole 10 .

[0059] In the above embodiment, a prefabricated pile construction method for soft soil foundation includes a prefabricated pile for soft soil foundation, wherein an anti-corrosion and waterproof adhesive coating is applied to the end of one pile body before the end of the pile body is matched with the end of the other pile body; the anti-corrosion and waterproof adhesive coating can be a polymer waterproof and anti-corrosion coating or a water-based epoxy asphalt waterproof and anti-corrosion coating.

[0060] The above embodiments are not only applicable to soft soil foundations, but also conventional foundations and can have corresponding technical effects; not only applicable to round piles, the same principle can also be applied to square piles. When the same principle is applied to square piles, the number of matching parts is four groups.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A prefabricated pile for soft soil foundation, comprising a pile body, characterized in that: Both ends of the pile body include end caps, the end caps include more than three sets of matching parts, the matching parts include concave sections (5) and convex sections (7), and the concave sections (5) of the matching parts on the end cap of one pile body and the convex sections (7) of the matching parts on the end cap of the other pile body are suitable for matching with each other; The concave section (5) comprises a matching groove 1 (6), the matching groove 1 (6) extending from the end surface of the concave section (5) in the length direction of the pile body, the width of the opening a1 of the matching groove 1 (6) located at the bottom surface of the concave section (5) is smaller than the width of the widest opening b1 of the matching groove 1 (6) located in the direction perpendicular to the length of the pile body; The convex section (7) comprises a second matching groove (8), the second matching groove (8) extending from the end surface of the convex section (7) in the length direction of the pile body, the width of the opening a2 of the second matching groove (8) located at the end surface of the convex section (7) is smaller than the width of the widest opening b2 of the second matching groove (8) located in the direction perpendicular to the length of the pile body; The end of one pile body and the end of the other pile body are matched with each other. In the matched state, the opening a1 on the end of one pile body overlaps with the opening a2 on the end of the other pile body, and the matching groove 1 (6) on the end of one pile body and the matching groove 2 (8) on the end of the other pile body form a matching groove 3; A locking piece (9) is adapted to be installed in the matching groove three.

2. The prefabricated pile for soft soil foundation according to claim 1, characterized in that: The locking member (9) comprises a top surface (93), a bottom surface, two end surfaces (91) and two side surfaces (92); When the end of one pile body matches with the end of another pile body and a locking piece (9) is installed in the matching groove three, the top surface (93) does not protrude from the outer surface of the end, the bottom surface fits with the bottom of the matching groove three, the two end surfaces (91) fit with the two end surfaces of the matching groove three in the length direction of the pile body, and the two side surfaces (92) fit with the two side surfaces of the matching groove three.

3. The prefabricated pile for soft soil foundation according to claim 2, characterized in that: The top surface (93) is in the shape of an arc and is concentric with the arc of the outer surface of the end.

4. The prefabricated pile for soft soil foundation according to claim 3, characterized in that: When the end of one pile body matches with the end of another pile body and a locking piece (9) is installed in the matching groove three, the top surface (93) and the outer surface of the end are located on the same arc surface.

5. The prefabricated pile for soft soil foundation according to claim 2, characterized in that: A waterproof pad is arranged between the bottom surface and the bottom of the matching groove.

6. The prefabricated pile for soft soil foundation according to claim 1, characterized in that: It comprises a connecting groove (13), a connecting step (11) and a fastening bolt. The connecting groove (13) is located at two vertex corners of the convex section (7) of the matching portion at one end of the pile body, and a threaded hole (14) is provided at the bottom of the connecting groove (13); The connecting step (11) extends from the side of the convex section (7) of the matching portion on the other end of the pile body toward the concave section (5), and the connecting step (11) is provided with a through hole (12); When the end of one pile body and the end of another pile body are in a state of mutual cooperation, the connection groove (13) and the connection step (11) are mutually fitted and the threaded hole (14) and the through hole (12) are opposite to each other; The fastening bolt passes through the through hole (12) and cooperates with the threaded hole (14).

7. The prefabricated pile for soft soil foundation according to claim 6, characterized in that: The head of the fastening bolt does not protrude from the outer surface of the end head, and the gap between the head of the fastening bolt and the outer surface of the end head is filled with anti-corrosion and waterproof filler.

8. A method for constructing precast piles for soft soil foundation, comprising the precast piles for soft soil foundation according to any one of claims 1 to 7, characterized in that: Before the end of one pile body is matched with the end of another pile body, an anti-corrosion and waterproof adhesive coating is applied to the end of the pile body.

Images