Prefabricated stiff composite pile and construction method

Abstract

The invention discloses a prefabricated stiff composite pile and a construction method, the prefabricated stiff composite pile comprises a peripheral pile body and a prefabricated pile shell matched with the peripheral pile body, the prefabricated pile shell is formed by a plurality of sections of pipe sleeves, and the adjacent sections of pipe sleeves are detachably connected; a longitudinal core pile concentric with the peripheral pile body and filling aggregate are arranged in the prefabricated pile shell. A protection structure is prefabricated on the outer side face of the prefabricated pile shell and is of a spiral structure or an annular structure arranged at intervals. A first connecting piece and a second connecting piece are arranged at the upper end or the lower end of the peripheral pile body and the upper end or the lower end of the prefabricated pile shell correspondingly. The adjacent prefabricated pile shells are connected through the first connecting pieces and the second connecting pieces to form the prefabricated stiff composite pile, the material cost is reduced under the condition that the structural stability is guaranteed, and the overall strength of the stiff composite pile is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction, and particularly relates to a prefabricated reinforced composite pile and a construction method. Background Art

[0002] At present, in the field of construction, it is often necessary to improve or replace the foundation soil, or when excavating the foundation pit, it is necessary to support the soil around the foundation pit. That is, piles must be driven on the foundation soil.

[0003] The pile types commonly used in the prior art include the following two types: reinforced concrete micro-piles, which have high rigidity and are simple to construct, but because the surface area of ​​the pile body is small, the side friction resistance and end resistance provided are small, and the upper load cannot be fully shared with the soil around the pile, resulting in excessive strength of the pile body but low bearing capacity, and the performance of the pile body cannot be fully utilized, resulting in low cost performance and waste of materials. This technical method is not suitable under the condition that the project cost needs to be fully considered.

[0004] Bored piles have a high bearing capacity and high pile strength, and are currently a commonly used pile type in engineering. Since the concrete is poured in mud and water during the construction of bored piles, the construction quality is difficult to control, and the quality of construction has a great impact on the bearing capacity of the piles. In addition, during the construction of bored piles, a large amount of mud waste will be generated due to the use of mud wall protection and other measures, which has a great impact on the environment, especially when construction is carried out in areas with high environmental protection requirements such as urban areas, it is very difficult to handle. Although bored piles have a large bearing capacity, the construction process is labor-intensive and time-consuming, the hole-forming speed is slow, and the bearing capacity is generally difficult to fully exert, resulting in waste of materials, and the workload of subsequent treatment of the pile top is also very large.

[0005] In view of the above factors, a prefabricated reinforced composite pile and a construction method are provided to reduce material costs while ensuring structural stability and improve the overall strength of the reinforced composite pile. Summary of the invention

[0006] The purpose of the present invention is to provide a prefabricated reinforced composite pile and a construction method to solve the problems raised in the above background technology.

[0007] The object of the present invention is achieved through the following technical solutions: a prefabricated stiffened composite pile, comprising an outer pile body and a prefabricated pile shell matched with the outer pile body, wherein the prefabricated pile shell is formed by a plurality of pipe sleeves, and adjacent plurality of pipe sleeves are connected in a detachable manner;

[0008] The prefabricated pile shell is provided with a longitudinal core pile concentric with the outer pile body and filled aggregate;

[0009] A prefabricated protective structure on the outer side of the prefabricated pile shell, wherein the protective structure is a spiral structure or an annular structure arranged at intervals;

[0010] The upper end or lower end of the outer pile body and the prefabricated pile shell is respectively provided with a first connecting member and a second connecting member;

[0011] The adjacent prefabricated pile shells are connected by a first connecting member and a second connecting member to form a prefabricated stiffened composite pile.

[0012] Furthermore, the longitudinal core pile is a longitudinal skeleton structure, and the longitudinal skeleton structure is a cross-shaped steel structure skeleton arranged at intervals, and the cross-shaped steel structure skeleton is arranged on a hollow steel structure casing.

[0013] Furthermore, the four sides of the cross steel structure frame are all arranged in an arc-shaped structure, and the arc-shaped structure is arranged in contact with the inner wall of the prefabricated pile shell;

[0014] A blocking structure is arranged at the bottom of the prefabricated pile shell for sealing.

[0015] Furthermore, the longitudinal core pile is a casing structure similar to the prefabricated pile shell, the longitudinal core pile is bonded to the prefabricated pile shell, and a steel bar skeleton is arranged along the inner wall of the longitudinal core pile;

[0016] The steel bar skeleton adopts a structure form of inclined support.

[0017] Furthermore, the protective structure is arranged in a spiral structure from top to bottom along the prefabricated pile shell, and the spiral structure is arranged at equal distances from top to bottom.

[0018] Furthermore, the protective structure is provided with an annular structure from top to bottom along the prefabricated pile shell, and the annular structure is provided with equal distances from top to bottom;

[0019] The annular structure is arranged along the prefabricated pile shell from top to bottom and extends to both sides with different widths.

[0020] Further, the first connecting member includes a first connecting end, the first connecting end is a planar structure, and the first connecting end is provided with evenly distributed bolt docking holes, and a plurality of docking rods are provided on the connecting plane along the inner side of the first connecting end;

[0021] The second connecting member includes a second connecting end matched with the first connecting end, the first connecting end is a planar structure, and the second connecting end is provided with evenly distributed bolt docking holes, and a plurality of channel holes matched with docking rods are provided on a connecting plane along the inner side of the second connecting end;

[0022] Furthermore, the length of the docking rod is the same as the thickness of the first connecting member, and the number of the docking rods is the same as the number of the bolt docking holes;

[0023] A plurality of channel holes cooperating with the docking rod are arranged on the connecting plane along the inner side of the second connecting end, and the distance between the upper plane of the second connecting end and the upper plane of the second connecting end is one third or one half of the height of the docking rod.

[0024] The construction method of prefabricated reinforced composite piles comprises the following steps:

[0025] Through the outer pile body and the prefabricated pile shells matched with the outer pile body, a plurality of the prefabricated pile shells are formed by multi-section pipe sleeves, and the adjacent multi-section pipe sleeves are connected in a detachable manner, and the adjacent prefabricated pile shells are connected through the first connecting member and the second connecting member to form a prefabricated stiffened composite pile;

[0026] A longitudinal core pile concentric with the outer pile body and filled aggregate are arranged in the prefabricated pile shell, and a protective structure is prefabricated on the outer side of the prefabricated pile shell, and the protective structure is a spiral structure or an annular structure arranged at intervals;

[0027] The longitudinal core pile adopts a longitudinal skeleton structure, which is a cross-shaped steel structure skeleton with intervals. The cross-shaped steel structure skeleton is arranged on a hollow steel structure casing. A cylindrical steel structure cover is arranged on the periphery of the longitudinal skeleton structure to wrap the longitudinal core pile. A plugging structure is arranged at the bottom of the prefabricated pile shell for a closed setting.

[0028] Alternatively, the longitudinal core pile is directly used as a casing structure similar to the prefabricated pile shell, the longitudinal core pile is bonded to the prefabricated pile shell, and a steel frame is provided along the inner wall of the longitudinal core pile, and the steel frame adopts a structure form of inclined support;

[0029] The outer pile body is made by the conventional cement-soil mixing pile-forming method. Before the outer pile body hardens, the prefabricated pile shell is inserted one by one, and the longitudinal core pile concentric with the outer pile body and the filling aggregate are installed in the prefabricated pile shell. Then sand and gravel are put into the prefabricated pile shell and the longitudinal core pile, and the sand and gravel are evenly distributed in the pile body. Cement slurry is poured into the gap to make the two fully bonded.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention forms a multi-section pipe sleeve by prefabricating the pile shell, and adjacent multi-section pipe sleeves are connected by flange bolts for easy docking, thereby facilitating on-site construction.

[0032] The prefabricated pile shell of the present invention is provided with a longitudinal core pile concentric with the outer pile body and filled with aggregate, so as to improve the strength of the pile body and make it more stable. According to different working conditions, the longitudinal core pile adopts two different groups of forms to reinforce the pile body;

[0033] The present invention can effectively improve the strength and vertical bearing capacity of the pile, and has higher bending, tensile and shear strengths, thereby greatly improving the ability of the pile to reinforce the foundation and support the foundation pit.

[0034] The present invention has reasonable design and convenient construction, which not only effectively increases the strength and bearing capacity of the pile body, but also reduces costs and facilitates construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0036] Figure 2 It is a three-dimensional schematic diagram of another state of the second connecting member of the present invention;

[0037] Figure 3 It is a schematic diagram of the splicing state of the prefabricated stiffened composite pile of the present invention;

[0038] Figure 4 The present invention Figure 1 Schematic cross-section;

[0039] Figure 5 The present invention Figure 1 Another state cross-sectional schematic diagram;

[0040] Figure 6 It is a schematic diagram of the state of the present invention having filled aggregate;

[0041] Figure 7 It is a plan view of the protective structure of the present invention;

[0042] Figure 8 It is a schematic diagram of another state of the protective structure of the present invention;

[0043] Fig. 9 It is a schematic diagram of the plane state of the longitudinal core pile of the present invention. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. Specific embodiment one:

[0048] like Figure 1-9 As shown, a prefabricated stiffened composite pile comprises an outer pile body 1 and a prefabricated pile shell 2 matched with the outer pile body 1, wherein the prefabricated pile shell 2 is formed by a multi-section pipe sleeve 3, and adjacent multi-section pipe sleeves 3 are connected in a detachable manner;

[0049] The prefabricated pile shell 2 is provided with a longitudinal core pile 4 concentric with the outer pile body 1 and a filling aggregate 5;

[0050] A prefabricated protective structure 6 is provided on the outer side of the prefabricated pile shell 2. The protective structure 6 is a spiral structure. The protective structure 6 is arranged in a spiral structure from top to bottom along the prefabricated pile shell 2. The spiral structure is arranged equidistantly from top to bottom.

[0051] The upper end or lower end of the outer pile body 1 and the prefabricated pile shell 2 are respectively provided with a first connecting member 7 and a second connecting member 8;

[0052] The adjacent prefabricated pile shells 2 are connected by a first connecting member 7 and a second connecting member 8 to form a prefabricated reinforced composite pile.

[0053] The longitudinal core pile 4 is a longitudinal skeleton structure, which is a cross-shaped steel structure skeleton arranged at intervals, and the cross-shaped steel structure skeleton is arranged on a hollow steel structure casing.

[0054] A hollow steel structure casing is used for easy support, and a cross-shaped steel structure frame is longitudinally arranged on the hollow steel structure casing.

[0055] The four sides of the cross steel structure frame are all arranged in an arc-shaped structure, and the arc-shaped structure is arranged to contact and cooperate with the inner wall of the prefabricated pile shell 2;

[0056] The bottom of the prefabricated pile shell 2 is provided with a blocking structure for sealing.

[0057] The first connecting member 7 includes a first connecting end, the first connecting end is a planar structure, and the first connecting end is provided with evenly distributed bolt docking holes, and a plurality of docking rods are provided on the connecting plane along the inner side of the first connecting end;

[0058] The second connecting member 8 includes a second connecting end matched with the first connecting end, the first connecting end is a planar structure, and the second connecting end is provided with evenly distributed bolt docking holes, and a plurality of channel holes matched with docking rods are provided on the connecting plane along the inner side of the second connecting end;

[0059] The length of the docking rod is the same as the thickness of the first connecting member 7, and the number of the docking rods is the same as the number of the bolt docking holes;

[0060] A plurality of channel holes cooperating with the docking rod are arranged on the connecting plane along the inner side of the second connecting end, and the distance between the upper plane of the second connecting end and the upper plane of the second connecting end is one third or one half of the height of the docking rod.

[0061] In order to facilitate the stable connection between the first connection end and the second connection end in use, a plurality of docking rods are respectively arranged on the connecting planes inside the first connection end and the second connection end to cooperate with the channel holes.

[0062] In the above embodiment, the adjacent prefabricated pile shells 2 are connected by the first connecting member 7 and the second connecting member 8 to form a prefabricated reinforced composite pile, wherein the prefabricated pile shell 2 is provided with a longitudinal core pile 4 concentric with the outer pile body 1 and a filling aggregate 5 to improve the overall strength;

[0063] The outer pile body 1 is a stirred and solidified body, and a protective structure 6 is prefabricated on the outer side of the prefabricated pile shell 2. The protective structure 6 is a spiral structure. The protective structure 6 is arranged in a spiral structure from top to bottom along the prefabricated pile shell 2. The spiral structure is equidistantly arranged from top to bottom. The above structural arrangement can achieve the purpose of coordinated force through the protective structure, thereby improving the overall stability. Specific embodiment 2:

[0065] Different from the first embodiment, a prefabricated stiffened composite pile comprises an outer pile body 1 and a prefabricated pile shell 2 matched with the outer pile body 1, wherein the prefabricated pile shell 2 is formed by a plurality of pipe sleeves 3, and adjacent plurality of pipe sleeves 3 are connected in a detachable manner;

[0066] The prefabricated pile shell 2 is provided with a longitudinal core pile 4 concentric with the outer pile body 1 and a filling aggregate 5;

[0067] A prefabricated protective structure 6 is provided on the outer side of the prefabricated pile shell 2. The protective structure 6 is an annular structure arranged at intervals. The protective structure 6 is an annular structure arranged from top to bottom along the prefabricated pile shell 2. The annular structure is equidistantly arranged from top to bottom.

[0068] The upper end or lower end of the outer pile body 1 and the prefabricated pile shell 2 are respectively provided with a first connecting member 7 and a second connecting member 8;

[0069] The adjacent prefabricated pile shells 2 are connected by a first connecting member 7 and a second connecting member 8 to form a prefabricated reinforced composite pile.

[0070] The longitudinal core pile 4 is a casing structure similar to the prefabricated pile shell 2. The longitudinal core pile 4 is bonded to the prefabricated pile shell 2, and a steel bar skeleton is arranged along the inner wall of the longitudinal core pile 4.

[0071] The steel bar skeleton adopts a diagonal support structure, and a blocking structure is arranged at the bottom of the prefabricated pile shell 2 for closed setting.

[0072] The annular structure is arranged along the outer pile body 1 from top to bottom and extends to both sides with different widths.

[0073] The first connecting member 7 includes a first connecting end, the first connecting end is a planar structure, and the first connecting end is provided with evenly distributed bolt docking holes, and a plurality of docking rods are provided on the connecting plane along the inner side of the first connecting end;

[0074] The second connecting member 8 includes a second connecting end matched with the first connecting end, the first connecting end is a planar structure, and the second connecting end is provided with evenly distributed bolt docking holes, and a plurality of channel holes matched with docking rods are provided on the connecting plane along the inner side of the second connecting end;

[0075] The length of the docking rod is the same as the thickness of the first connecting member 7, and the number of the docking rods is the same as the number of the bolt docking holes;

[0076] A plurality of channel holes cooperating with the docking rod are arranged on the connecting plane along the inner side of the second connecting end, and the distance between the upper plane of the second connecting end and the upper plane of the second connecting end is one third or one half of the height of the docking rod. Specific embodiment three:

[0078] The construction method of prefabricated reinforced composite piles comprises the following steps:

[0079] Through the peripheral pile body 1 and the prefabricated pile shell 2 matched with the peripheral pile body 1, a plurality of the prefabricated pile shells 2 are formed by multi-section pipe sleeves 3, and the adjacent multi-section pipe sleeves 3 are connected in a detachable manner, and the adjacent prefabricated pile shells 2 are connected by a first connecting member 7 and a second connecting member 8 to form a prefabricated stiffened composite pile;

[0080] The prefabricated pile shell 2 is provided with a longitudinal core pile 4 concentric with the outer pile body 1 and a filling aggregate 5. The outer side of the prefabricated pile shell 2 is provided with a prefabricated protective structure 6, and the protective structure 6 is a spiral structure or an annular structure arranged at intervals.

[0081] The longitudinal core pile 4 is a longitudinal skeleton structure, which is a cross-shaped steel structure skeleton with intervals, and the cross-shaped steel structure skeleton is arranged on a hollow steel structure casing. A cylindrical steel structure cover is arranged on the periphery of the longitudinal skeleton structure to wrap the longitudinal core pile 4, and a plugging structure is arranged at the bottom of the prefabricated pile shell 2 for a closed setting;

[0082] Alternatively, the longitudinal core pile 4 is directly used as a casing structure similar to the prefabricated pile shell 2, the longitudinal core pile 4 is bonded to the prefabricated pile shell 2, and a steel frame is provided along the inner wall of the longitudinal core pile 4, and the steel frame adopts a structure in which an inclined support is adopted;

[0083] The outer pile body 1 is made by a conventional cement-soil mixing pile-forming method, and before the outer pile body 1 hardens, the prefabricated pile shell 2 is inserted in turn, and a longitudinal core pile 4 concentric with the outer pile body 1 and a filling aggregate 5 are installed in the prefabricated pile shell 2, and then sand and gravel are put into the prefabricated pile shell 2 and the longitudinal core pile 4, and the sand and gravel are evenly distributed in the pile body, and cement slurry is poured into the gap to make the two fully bonded.

[0084] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0085] 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 reinforced composite pile, characterized in that: It comprises an outer pile body (1) and a prefabricated pile shell (2) matched with the outer pile body (1), wherein the prefabricated pile shell (2) is formed by a plurality of pipe sleeves (3), and adjacent plurality of pipe sleeves (3) are connected in a detachable manner; The prefabricated pile shell (2) is provided with a longitudinal core pile (4) concentric with the outer pile body (1) and a filling aggregate (5); A prefabricated protective structure (6) is provided on the outer side of the prefabricated pile shell (2), wherein the protective structure (6) is a spiral structure or an annular structure arranged at intervals; A first connecting member (7) and a second connecting member (8) are respectively provided at the upper end or the lower end of the outer pile body (1) and the prefabricated pile shell (2); Adjacent prefabricated pile shells (2) are connected via a first connecting member (7) and a second connecting member (8) to form a prefabricated reinforced composite pile.

2. The prefabricated reinforced composite pile according to claim 1, characterized in that: The longitudinal core pile (4) is a longitudinal skeleton structure, which is a cross-shaped steel structure skeleton arranged at intervals, and the cross-shaped steel structure skeleton is arranged on a hollow steel structure casing.

3. The prefabricated reinforced composite pile according to claim 2, characterized in that: The four sides of the cross steel structure frame are all arranged in an arc-shaped structure, and the arc-shaped structure is arranged to contact and cooperate with the inner wall of the prefabricated pile shell (2); The bottom of the prefabricated pile shell (2) is provided with a blocking structure for sealing.

4. The prefabricated reinforced composite pile according to claim 1, characterized in that: The longitudinal core pile (4) is a casing structure similar to the prefabricated pile shell (2), the longitudinal core pile (4) is bonded to the prefabricated pile shell (2), and a steel bar skeleton is arranged along the inner wall of the longitudinal core pile (4); The steel bar skeleton adopts a structure form of inclined support.

5. The prefabricated reinforced composite pile according to claim 2, characterized in that: The protective structure (6) is arranged in a spiral structure from top to bottom along the prefabricated pile shell (2), and the spiral structure is arranged at equal distances from top to bottom.

6. The prefabricated reinforced composite pile according to claim 2, characterized in that: The protective structure (6) is arranged in an annular structure from top to bottom along the prefabricated pile shell (2), and the annular structure is arranged equidistantly from top to bottom; The annular structure is arranged along the prefabricated pile shell (2) from top to bottom and extends to both sides with different widths.

7. The prefabricated reinforced composite pile according to claim 2, characterized in that: The first connecting member (7) comprises a first connecting end, the first connecting end is a planar structure, and the first connecting end is provided with evenly distributed bolt docking holes, and a plurality of docking rods are provided on a connecting plane along the inner side of the first connecting end; The second connecting member (8) comprises a second connecting end cooperating with the first connecting end, the first connecting end is a planar structure, and the second connecting end is provided with evenly distributed bolt docking holes, and a plurality of channel holes cooperating with docking rods are provided on the connecting plane along the inner side of the second connecting end.

8. The prefabricated reinforced composite pile according to claim 7, characterized in that: The length of the docking rod is the same as the thickness of the first connecting member (7), and the number of the docking rods is the same as the number of the bolt docking holes; A plurality of channel holes cooperating with the docking rod are arranged on the connecting plane along the inner side of the second connecting end, and the distance between the upper plane of the second connecting end and the upper plane of the second connecting end is one third or one half of the height of the docking rod.

9. The construction method of prefabricated reinforced composite pile according to any one of claims 1 to 8, characterized in that: The steps include: Through an outer pile body (1) and a prefabricated pile shell (2) matched with the outer pile body (1), a plurality of the prefabricated pile shells (2) are formed by a multi-section pipe sleeve (3), and adjacent multi-section pipe sleeves (3) are connected in a detachable manner, and adjacent prefabricated pile shells (2) are connected through a first connecting piece (7) and a second connecting piece (8) to form a prefabricated stiffened composite pile; A longitudinal core pile (4) and a filling aggregate (5) are arranged in the prefabricated pile shell (2) which are concentric with the outer pile body (1). A prefabricated protective structure (6) is arranged on the outer side of the prefabricated pile shell (2). The protective structure (6) is a spiral structure or an annular structure arranged at intervals. The longitudinal core pile (4) is a longitudinal skeleton structure, which is a cross-shaped steel structure skeleton arranged at intervals, and the cross-shaped steel structure skeleton is arranged on a hollow steel structure casing. A cylindrical steel structure cover is arranged on the periphery of the longitudinal skeleton structure to wrap the longitudinal core pile (4), and a blocking structure is arranged at the bottom of the prefabricated pile shell (2) for sealing. Alternatively, the longitudinal core pile (4) is directly used as a casing structure similar to the prefabricated pile shell (2), the longitudinal core pile (4) is bonded to the prefabricated pile shell (2), and a steel frame is provided along the inner wall of the longitudinal core pile (4), and the steel frame adopts a structure form of inclined support; The outer pile body (1) is manufactured by a conventional cement-soil mixing pile-forming method. Before the outer pile body (1) hardens, a prefabricated pile shell (2) is inserted, and a longitudinal core pile (4) concentric with the outer pile body (1) and a filling aggregate (5) are installed in the prefabricated pile shell (2). Then, sand and gravel are put into the prefabricated pile shell (2) and the longitudinal core pile (4), and the sand and gravel are evenly distributed in the pile body. Cement slurry is poured into the gaps to make the two fully bonded.

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