A cast-in-place pile fixing device for building foundation construction

Abstract

The present invention belongs to the technical field of bored pile construction, and specifically discloses a bored pile fixing device for building foundation construction, including a bearing plate, a plurality of penetration nails and an elastic base, wherein the tail end of the penetration nail is hinged with the edge of the bearing plate; the elastic base is connected to the bottom of the bearing plate through an elastic member, and a plurality of guide ramps are arranged around the elastic member on the top of the elastic base, and a guide slope is arranged on the top surface of the guide ramp, and the guide slope is located directly below the corresponding penetration nail, and the height of the guide slope gradually decreases in the direction away from the center of the bearing plate, and when the elastic base is in a natural state, all the penetration nails are vertically retracted under the action of gravity; when the bearing plate carries concrete to compress the elastic base, the head end of the penetration nail slides along the corresponding guide slope to make the penetration nail turn to the horizontal and extend radially along the bearing plate. The fixing device can effectively solve the technical problem that the bottom of the steel cage is prone to tilt or shake when pouring concrete into the pile hole of the bored pile.

Description

Technical Field

[0001] The invention belongs to the technical field of cast-in-place pile construction, and in particular relates to a cast-in-place pile fixing device used for building foundation construction. Background Art

[0002] Cast-in-place pile construction is one of the important basic engineering forms in building foundation construction. The specific construction process includes: forming pile holes in the foundation soil by mechanical drilling, steel pipe squeezing or manual excavation at the building foundation construction site, and then placing steel cages in the pile holes and pouring concrete to form cast-in-place piles. When pouring concrete into the pile holes, the concrete flows into the pile holes from the conduit at a large flow rate, generating a large impact force and pressure, which can easily cause the steel cage to shake or float. The shaking or floating steel cage seriously deviates from the preset position and preset angle, and it is easy to cause pores and cracks in the solidified concrete, which seriously affects the various properties of the cast-in-place piles in the later stage.

[0003] In order to overcome the above problems, it is now common to fix the steel cage at the pile hole, for example, by using a compression ring to press the top of the steel cage downward, and then using bolts to fix the compression ring to the ground around the pile hole, so as to fix and limit the steel cage to a certain extent.

[0004] However, the above-mentioned solutions still have the following problems: (1) The top of the steel cage is fixed, and when pouring concrete, the concrete first flows into the bottom of the pile hole through the conduit, impacting the bottom or lower part of the steel cage, and the fixing structure located at the mouth of the pile hole cannot ensure the stability of the bottom of the steel cage, which makes the bottom of the steel cage prone to tilting or shaking; (2) The fixing ring or other fixing parts are fixed to the ground by bolts, the bolts are in a vertical state, and the tops of the bolts are not subjected to downward extrusion pressure. When the steel cage is hydraulically floated, the steel cage continuously applies a vertical upward force to the bolts, which can easily cause the bolts to loosen; and when the bottom of the steel cage is impacted and tilts or shakes, the bolts are continuously subjected to an oblique upward force, which can also easily cause the bolts to loosen. Summary of the invention

[0005] The purpose of the present invention is to overcome the defect in the prior art that the bottom of the steel cage is prone to tilt or shake when pouring concrete into the pile hole of the cast-in-place pile, and to provide a cast-in-place pile fixing device for building foundation construction.

[0006] The present invention provides a cast-in-place pile fixing device for building foundation construction, which is used to fix a steel cage in a pile hole, and comprises:

[0007] A bearing plate, the diameter of which matches the inner diameter of the steel cage, and the bearing plate is used to bear concrete;

[0008] A plurality of penetration nails, the tail ends of the penetration nails are hinged to the edge of the carrying plate;

[0009] An elastic base, the elastic base is used to contact the bottom of the pile hole; the elastic base is connected to the bottom of the bearing plate through an elastic member, a plurality of guide ramps are arranged around the elastic member on the top of the elastic base, the guide ramps correspond to the penetration nails one by one, a guide slope is arranged on the top surface of the guide ramp, the guide slope is located directly below the corresponding penetration nail, and the height of the guide slope gradually decreases in the direction away from the center of the bearing plate;

[0010] When the elastic base is in a natural state, all the penetration nails are vertically retracted under the action of gravity;

[0011] When the bearing plate carries concrete to compress the elastic base, the head end of the penetration nail slides along the corresponding guiding inclined surface to make the penetration nail turn to horizontal and extend in the radial direction of the bearing plate.

[0012] A further solution is that the edge of the carrier plate is provided with a plurality of grooves along the radial direction, the grooves correspond to the penetration nails one by one, the inner wall of the groove is provided with an extension groove along the length direction, a rotating shaft is slidably arranged in the extension groove, and the rotating shaft is hinged with the tail end of the corresponding penetration nail;

[0013] The guide ramp is in the shape of a plate, and can be inserted into the corresponding groove rail to squeeze the tail end of the corresponding penetration nail, so that the rotating shaft slides along the extension groove.

[0014] A further solution is that a regulating rope is connected between the head ends of adjacent penetration nails.

[0015] A further solution is that the portion of the guiding slope close to the center of the carrier plate is a concave slope, and the portion of the guiding slope away from the center of the carrier plate is a convex slope, and the concave slope is smoothly connected to the convex slope.

[0016] A further solution is that a soft bearing tube is arranged around the edge of the top surface of the bearing plate, and the outer diameter of the bearing tube opening is larger than the diameter of the bearing plate and slightly larger than the inner diameter of the steel cage;

[0017] The tube mouth ring of the bearing tube is provided with an expansion limiting ring;

[0018] The edge of the tube mouth of the bearing tube is provided with a plurality of barbs, and the barbs can be hooked with the horizontal steel bars of the steel cage.

[0019] A further solution is that it also includes a middle shaft, wherein the bottom end of the middle shaft is configured to be in the shape of a drill bit and has an external thread;

[0020] A through hole matching the central axis is formed in the middle of the carrier plate and the middle of the elastic base, and the bottom of the central axis passes through the carrier plate and the elastic base in sequence;

[0021] The central shaft is connected with an extrusion plate, and the bottom surface of the extrusion plate contacts the top surface of the carrying plate.

[0022] A further solution is that it also includes a plurality of elastic expansion plates, each of which has a through hole in the middle so that the expansion plate can slide along the central axis. The surface of the expansion plate is a conical surface. When the expansion plate is in a natural state, the outer diameter of the expansion plate matches the inner diameter of the steel cage.

[0023] A further solution is that the central axis is provided with a plurality of bone joints along the length direction, and the sizes of all the bone joints increase successively along the vertical downward direction;

[0024] The expansion support plate corresponds to the joints one by one, and the size of the through hole in the middle of the expansion support plate is smaller than the size of the corresponding joint, and larger than the size of all the joints located above the corresponding joint.

[0025] A further solution is that the joint portion is truncated cone-shaped.

[0026] A further solution is that the expansion support plate includes a mesh cone portion located in the middle and a bearing ring located at the edge, and an annular bearing groove is provided on the top surface of the bearing ring.

[0027] A further solution is that it also includes a top fixing ring, the outer diameter of which matches the inner diameter of the steel cage, the top fixing ring is radially slidably connected with a plurality of fastening nails, the tail ends of the fastening nails are axially hinged with extension rods, the extension rods are axially hinged with lifting rings, and the inner diameter of the lifting ring matches the diameter of the central axis;

[0028] The top end of the central shaft is provided with an external thread and is screwed with an extrusion nut, wherein the extrusion nut is used for extruding the lifting ring so that the fastening nail is protruded outward.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a cast-in-place pile fixing device for building foundation construction, which is provided with a bearing plate, a plurality of penetration nails are hinged on the edge of the bearing plate, and an elastic base is provided at the bottom of the bearing plate. After a steel cage is placed in the pile hole, the fixing device is placed in the steel cage. At this time, the penetration nails are in a vertical state and are located below the bearing plate, and will not scratch the steel cage. After the elastic base contacts the bottom of the pile hole, concrete is poured into the pile hole, the concrete contacts the bearing plate, and is largely received by the bearing plate, so that the elastic part of the elastic base is squeezed, and the bearing plate gradually descends, so that the head end of the penetration nail contacts the guide slope of the corresponding guide ramp. And gradually slide down and tilt along the guiding slope, so that the penetration nail gradually turns to a horizontal state. During the process, the head end of the penetration nail extends outward from the edge of the bearing plate, passes through the hole of the steel cage, and then is inserted into the side wall at the bottom of the pile hole. When the bearing plate falls to contact with the elastic base, the bearing plate stops falling, and the penetration nail is in a horizontal state. A large number of penetration nails are inserted into the side walls of the pile hole. The gravity and pressure of the concrete fix the fixing device longitudinally. At the same time, the penetration nail fixes the bottom of the steel cage to the pile hole horizontally. At the same time, the concrete fills the gap between the steel cage and the fixing device, and effectively fixes the bottom of the steel cage, thereby solving the technical problem that the bottom of the steel cage is prone to tilting or shaking when pouring concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following drawings are only used to illustrate and explain the present invention, and are not used to limit the scope of the present invention, wherein:

[0031] Figure 1 A schematic diagram of the assembly of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of a foundation portion of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0033] Figure 3 A half-section schematic diagram of a foundation portion of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0034] Figure 4 A half-section schematic diagram of a base part of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention after bearing concrete;

[0035] Figure 5 A schematic diagram of the assembly of a central axis of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0036] Figure 6 A schematic diagram of an expansion support plate of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0037] Figure 7 A cross-sectional view of an expansion support plate of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0038] Figure 8 A schematic diagram of a top fixing ring of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0039] Fig. 9 A half-section schematic diagram of a top fixing ring of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention;

[0040] Fig.10 A schematic diagram of a joint portion of a cast-in-place pile fixing device for building foundation construction provided by an embodiment of the present invention.

[0041] In the figure: 0-pile hole; 1-rebar cage; 10-bearing plate; 11-elastic base; 111-elastic member; 112-guide ramp; 1121-guide slope; 113-guide rod; 114-pin; 12-groove rail; 121-extension groove; 122-rotating shaft; 13-bearing cylinder; 131-limit expansion ring; 132-barb; 20-penetration nail; 21-barb; 22-regulating rope; 30-central axis; 301-joint part; 31-extrusion plate; 40-expansion support plate; 41-net cone part; 42-bearing ring; 421-bearing groove; 50-top fixing ring; 51-fastening nail; 52-extension rod; 53-lifting ring; 54-extrusion nut. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution, design method and advantages of the present invention clearer, the present invention is further described in detail by specific embodiments in conjunction with the accompanying drawings. 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.

[0043] Please refer to Figures 1 to 5The embodiment of the present invention provides a cast-in-place pile fixing device for building foundation construction, comprising: a bearing plate 10, the diameter of which matches the inner diameter of a steel cage 1, and the bearing plate 10 is used to bear concrete; a second one comprises a plurality of penetration nails 20, the tail ends of which are hinged with the edge of the bearing plate 10; a third one comprises an elastic base 11, and the elastic base 11 is used to contact the bottom of the pile hole 0; the elastic base 11 is connected to the bottom of the bearing plate 10 through an elastic member 111, and a plurality of guide ramps 112 are arranged on the top of the elastic base 11 around the elastic member 111, and the guide ramps 112 are connected to the bottom of the pile hole 0; The penetration nails 20 correspond one to one, and a guiding slope 1121 is provided on the top surface of the guiding ramp 112. The guiding slope 1121 is located directly below the corresponding penetration nail 20, and the height of the guiding slope 1121 gradually decreases in the direction away from the center of the supporting plate 10; when the elastic base 11 is in a natural state, all the penetration nails 20 are vertically retracted under the action of gravity; when the supporting plate 10 carries concrete to compress the elastic base 11, the head end of the penetration nail 20 slides along the corresponding guiding slope 1121 to make the penetration nail 20 turn to the horizontal and extend radially along the supporting plate 10.

[0044] The cast-in-place pile fixing device for building foundation construction provided in this embodiment is provided with a bearing plate 10, a plurality of penetration nails 20 are hinged on the edge of the bearing plate 10, and an elastic base 11 is provided at the bottom of the bearing plate 10. After the steel cage 1 is placed in the pile hole 0, the fixing device is placed in the steel cage 1. At this time, the penetration nails 20 are in a vertical state and are located below the bearing plate 10, and will not scratch the steel cage 1. Until the elastic base 11 contacts the bottom of the pile hole 0, concrete is poured into the pile hole 0, the concrete contacts the bearing plate 10, and is largely received by the bearing plate 10, so that the elastic member 111 of the elastic base 11 is squeezed, and the bearing plate 10 gradually descends, so that the head end of the penetration nail 20 contacts the guide slope 1121 of the corresponding guide ramp 112, and gradually Slide down and tilt along the guiding slope 1121, so that the penetration nail 20 gradually turns to a horizontal state. During the process, the head end of the penetration nail 20 extends outward from the edge of the bearing plate 10, passes through the hole of the steel cage 1, and then is inserted into the side wall of the bottom of the pile hole 0. When the bearing plate 10 falls to contact with the elastic base 11, the bearing plate 10 stops falling, and the penetration nail 20 is in a horizontal state. A large number of penetration nails are inserted into the side wall of the pile hole 0. The gravity and pressure of the concrete fix the fixing device longitudinally. At the same time, the penetration nail 20 fixes the bottom of the steel cage 1 to the pile hole 0 in the horizontal direction. At the same time, the concrete fills the gap between the steel cage 1 and the fixing device, and effectively fixes the bottom of the steel cage 1, thereby solving the technical problem that the bottom of the steel cage 1 is prone to tilting or shaking when pouring concrete.

[0045] It should be noted that the elastic member 111 can be any retractable elastic member in the prior art, such as a spring, a hydraulic rod, a hydraulic rod group and other compliant elastic members. It only needs to be able to lift up the supporting plate 10 in a natural state, so that the penetration nail 20 hangs down to a vertical position, and then be able to be fully squeezed after bearing the pressure.

[0046] It should be noted that the height of the top surface of the elastic base 11 can be adaptively designed according to the setting height of the horizontally set steel bar ring of the steel cage 1, for example, it can be flush with the top surface of the steel bar ring at the bottom of the steel cage 1, so that the penetration nail 20 is just pressed on the top surface of the bottom steel bar ring when it is extended horizontally, thereby fixing the steel cage 1; the size of the hole of the steel cage 1 can also be adaptively designed to match the hole size with the diameter of the penetration nail 20, thereby achieving the fixation of the steel cage 1.

[0047] In order to further enhance the fixing effect of the penetration nail 20, a plurality of radial grooves 12 are opened on the edge of the carrier plate 10, and the grooves 12 correspond to the penetration nails 20 one by one. An extension groove 121 is opened on the inner wall of the groove 12 along the length direction, and a rotating shaft 122 is slidably arranged in the extension groove 121, and the rotating shaft 122 is hinged to the corresponding tail end of the penetration nail 20; the guide ramp 112 is plate-shaped, and the guide ramp 112 can be inserted into the corresponding groove 12 to squeeze the corresponding tail end of the penetration nail 20, so that the rotating shaft 122 slides along the extension groove 121.

[0048] By providing the groove rail 12, the tail end of the penetration nail 20 is embedded in the edge of the carrier plate 10, so that the axis hinge point is located in the plane where the carrier plate 10 is located. When the penetration nail 20 is rotated to the horizontal, it is also located in the plane where the carrier plate 10 is located. The top surface of the elastic base 11 can provide structural support for the penetration nail 20 from below, and the thickness of the carrier plate 10 can protect the penetration nail 20 from unnecessary shear and torsion. By providing the extension groove 121 and arranging the rotating shaft 122 in the extension groove 121, the penetration nail 20 can slide along the extension groove 121, further increasing the extension length of the penetration nail 20, that is, increasing the penetration depth of the penetration nail 20. Further, by providing the guide ramp 112 in a plate shape, it can be inserted into the corresponding groove rail 12, and the guide slope 1121 is used to squeeze the tail end of the corresponding penetration nail 20, forcing the penetration nail 20 to slide outward along the extension groove 121 and further nailed into the side wall of the pile hole 0.

[0049] Preferably, the rotating shaft 122 is connected to the inner end of the groove rail 12 through a reset member (such as a spring) so that it can slide inward and reset when it is not squeezed by the guide ramp 112, so that the penetration nail 20 is retracted under the carrier plate 10.

[0050] Preferably, the portion of the guiding slope 1121 close to the center of the carrier plate 10 is a concave slope, and the portion of the guiding slope 1121 away from the center of the carrier plate 10 is a convex slope, and the concave slope is smoothly connected to the convex slope.

[0051] With the above arrangement, when the carrier plate 10 gradually descends, the highest part of the guide ramp 112 (the part close to the center of the carrier plate 10) is first inserted into the groove rail 12. Since it is a concave slope, its highest part is sharp, which can effectively improve the smoothness of its highest part inserted into the groove rail 12, and the squeezing effect of the concave slope can delay the lateral displacement of the penetration nail 20 to a certain extent, first ensuring the vertical displacement, and preventing the tail end of the penetration nail 20 from being lowered to a suitable height and being extended horizontally in large quantities; by setting the guide ramp The lowest part of the platform 112 (the part away from the center of the carrier plate 10) is a convex slope. At this time, since the guide slope 112 has been mostly inserted into the groove rail 12, the descent amount of the carrier plate 10 is also sufficient. The convex slope can effectively squeeze the penetration nail 20 for lateral movement, and has a certain reverse self-locking performance to prevent the reaction force of the penetration nail 20 from reversely squeezing the guide slope 112 and not descending to the lowest point along the guide slope 1121, resulting in the carrier plate 10 being unable to descend to the lowest point. The convex slope can well avoid this situation.

[0052] Preferably, a plurality of guide rods 113 are provided around the elastic member 111 at the top of the elastic base 11, and the guide rods 113 pass through the carrier plate 10. By providing a plurality of guide rods 113, the descending path of the carrier plate 10 is limited and unnecessary rotation is prevented.

[0053] Preferably, the surface of the penetration nail 20 is provided with a plurality of barbs 21. The barbs 21 can further improve the fixing performance between the penetration nail 20 and the side wall of the pile hole 0.

[0054] Preferably, a regulating rope 22 is connected between the head ends of adjacent penetration nails 20. By providing the regulating rope 22, when two adjacent penetration nails 20 are inserted into different holes of the steel cage 1 and further extended outward, the regulating rope 22 will be gradually tightened and squeezed with the longitudinal steel bars of the steel cage 1, thereby applying outward pressure to the steel cage 1, stabilizing the steel cage on the one hand, and slightly squeezing the steel cage outward on the other hand, so that it is closer to the side wall of the pile hole 0, further improving the fixing effect.

[0055] Preferably, a plurality of pins 114 are vertically disposed at the bottom of the elastic base 11. As the bearing plate 10 gradually bears concrete, the gravity borne by the elastic base 11 gradually increases, so that the pins 114 are driven into the bottom of the pile hole 0 to a certain extent, thereby improving the stability of the elastic base 11.

[0056] In order to further optimize the bearing performance of the bearing plate 10 and ensure that it can bear concrete of sufficient weight, a soft bearing tube 13 is arranged around the edge of the top surface of the bearing plate 10. The outer diameter of the tube mouth of the bearing tube 13 is larger than the diameter of the bearing plate 10 and slightly larger than the inner diameter of the steel cage 1.

[0057] By providing the bearing tube 13, the longitudinal bearing depth of the bearing plate 10 is extended, and since the outer diameter of the tube mouth of the bearing tube 13 is larger than the diameter of the bearing plate 10, it is bowl-shaped, further improving the bearing performance, and since its outer diameter is slightly larger than the inner diameter of the steel cage 1 and it is soft, when it is placed in the fixing device, the inner wall of the steel cage 1 squeezes it, and the two are interference fit, so that the gap between the bearing tube 13 and the steel cage 1 is effectively closed, and the bearing capacity of the bearing tube 13 is further guaranteed.

[0058] It should be noted that the supporting tube 13 can be made of a soft material with a certain hardness, such as soft plastic, rubber, etc., as long as it can maintain its basic shape when not subjected to extrusion pressure.

[0059] Preferably, the tube mouth ring of the bearing tube 13 is provided with an expansion limiting ring 131. The expansion limiting ring 131 is made of a material with high tensile strength and certain elasticity, such as a steel sheet ring prepared by cutting and welding stainless steel sheets. The expansion limiting ring 131 can effectively limit the diameter of the tube mouth of the bearing tube 13 to prevent the tube mouth from excessive expansion and deformation, thereby losing the bearing capacity.

[0060] Preferably, a plurality of barbs 132 are provided on the edge of the tube opening of the support tube 13 , and the barbs 132 can be hooked with the horizontal steel bars of the steel cage 1 .

[0061] By setting the barb 132, when the bearing tube 13 gradually descends after carrying the concrete, the barb 132 descends with the bearing tube 13 and scrapes the horizontal steel ring of the steel cage 1. When the barb 132 drops to the bottom of the horizontal steel ring, the barb 132 expands outward under the elastic action of the tube mouth of the bearing tube 13, so that the reverse hook is set under the horizontal steel ring to prevent the bearing tube 13 from rising in reverse due to various reasons and continuing to descend. When the bearing tube 13 drops to the lowest position, the barb 132 is located under a certain layer of horizontal steel rings and is reversely hooked under the horizontal steel ring. At this time, the concrete fixes the bearing tube 13 vertically, the penetration nail 20 fixes the bottom of the steel cage 1 to the side wall of the pile hole 0, and the horizontal steel ring of the steel cage 1 fixes the bearing tube 13 vertically through the barb 132. Multiple fixations realize composite fixation, making the fixed structure more stable.

[0062] In order to further improve the fixing effect of the steel cage 1, the cast-in-place pile fixing device for building foundation construction provided in this embodiment also includes a central axis 30, the bottom end of which is configured to be in the shape of a drill bit and has an external thread; the middle part of the supporting plate 10 and the middle part of the elastic base 11 are both provided with through holes matching the central axis 30; the central axis 30 is connected to an extrusion plate 31, and the bottom surface of the extrusion plate 31 is in contact with the top surface of the supporting plate 10.

[0063] By setting the central axis 30, and setting its bottom end to be drill-shaped and having external threads, after the above-mentioned fixing device is placed, before pouring concrete, the central axis 30 is first inserted to block the through holes in the middle of the bearing plate 10 and the middle of the elastic base 11, so that the bottom end of the central axis 30 contacts the bottom of the pile hole 0, and then concrete is poured. After pouring to a certain depth, the central axis 30 is rotated by a rotary arm or other tools to make its drill-shaped bottom end drill into the bottom of the pile hole 0. During the process, the extrusion plate 31 descends together with the central axis 30 until it is pressed against the top surface of the bearing plate 10. At this time, the central axis 30 is fixed to the bottom of the pile hole 0 through the drill-shaped bottom end, so that the height of the extrusion plate 31 is fixed, so that the height of the bearing plate 10 is limited and fixed by the extrusion plate 31, and then the positions of several penetration nails 20 are fixed, so as to further improve the fixing effect. After the pouring is completed, the central axis 30 will also become a part of the skeleton of the entire cast-in-place pile, thereby improving the overall strength of the cast-in-place pile.

[0064] It should be noted that the middle shaft 30 is made of a steel grade commonly used in the art, and its bending resistance must be guaranteed.

[0065] It should be noted that the top of the central axis 30 can be set to a prism shape, which is convenient for installing equipment such as a rotary arm and a pipe clamp, and is convenient for screwing it; a corresponding rotary arm can be specially prepared, and the rotary arm is preferably a symmetrical double-arm rotary arm with a matching prismatic hole in the middle.

[0066] Please Figure 1 Further reference Figure 6 and Figure 7 In order to further improve the fixing effect of the steel cage 1 and improve the stability of the central axis 30, the cast-in-place pile fixing device for building foundation construction provided in this embodiment also includes a plurality of elastic expansion plates 40, and a through hole is opened in the middle of the expansion plate 40 so that the expansion plate 40 can slide along the central axis 30. The disk surface of the expansion plate 40 is a conical surface. When the expansion plate 40 is in a natural state, the outer diameter of the expansion plate 40 matches the inner diameter of the steel cage 1.

[0067] By setting a plurality of expansion and support plates 40, after the central axis 30 is screwed into the bottom of the pile hole 0, pouring is continued. When pouring to a certain height, an expansion and support plate 40 is installed on the central axis 30, so that it falls along the central axis 30 to the pouring concrete surface, and then pouring is continued, so that the concrete falls on the expansion and support plate 40. Since the expansion and support plate 40 is made of elastic material and its disk surface is a conical surface, when its disk surface bears concrete, it is deformed, forcing the disk surface to be pressed from the conical surface to a quasi-plane. During the process, the edge of the expansion and support plate 40 gradually squeezes the inner wall of the steel cage 1, so that the steel cage 1 is closer to the inner wall of the pile hole 0, thereby reducing the possibility of the steel cage 1 shaking, and conversely, the inner wall of the steel cage 1 radially limits the central axis 30 through the expansion and support plate 40, reducing the possibility of shaking or deflection. During the pouring process, an expansion and support plate 40 can be placed at intervals, so that the steel cage 1 is fully expanded and supported, and the central axis 30 is fully limited at the same time.

[0068] Please Figure 1 , Figure 6 , Figure 7 Further reference Fig.10 In order to further ensure the expansion effect of the expansion plate 40, the central axis 30 is provided with a plurality of joints 301 along the length direction, and the sizes of all the joints 301 increase successively along the vertical downward direction; the expansion plate 40 corresponds to the joints 301 one by one, and the size of the through hole in the middle of the expansion plate 40 is smaller than the size of the corresponding joint 301, and larger than the size of all the joints 301 located above the corresponding joint 301.

[0069] By setting a plurality of joints 301, the joints 301 are used to provide structural support for the middle part of the expansion support plate 40, so that it will inevitably deform when bearing concrete, and laterally expand the steel cage 1; on this basis, by setting a plurality of joints 301, the size of which is gradually increased from top to bottom, and matching the size of the through holes of each expansion support plate 40, the expansion support plate 40 with the largest through hole can pass through the upper joint 301 until it falls to the lowest joint 301 and is clamped with the joint 301.

[0070] Preferably, the joint portion 301 is truncated cone-shaped. The truncated cone-shaped joint portion 301 can block and tighten the through hole in the middle of the expansion plate 40 by utilizing the self-locking property of the inclined surface.

[0071] In order to prevent the expansion support plate 40 from excessively hindering concrete pouring and even causing concrete stratification and fracture in the finished cast-in-place pile, the expansion support plate 40 includes a mesh cone portion 41 located in the middle and a bearing ring 42 located at the edge, and the top surface of the bearing ring 42 is provided with an annular bearing groove 421.

[0072] With the above arrangement, when pouring concrete, the concrete in the mesh cone portion 41 will continue to flow downward through the mesh cone portion 41 , while the concrete at the bearing ring 42 will fall into the bearing groove 421 to press the bearing ring 42 to make it fall, thereby causing the mesh cone portion 41 to deform.

[0073] Please Figure 1 Further reference Figure 8 and Fig. 9 In order to further improve the fixing effect of the steel cage 1 and improve the stability of the central axis 30, the cast-in-place pile fixing device for building foundation construction provided in this embodiment also includes a top fixing ring 50, the outer diameter of the top fixing ring 50 matches the inner diameter of the steel cage 1, and the top fixing ring 50 is radially slidably connected with a plurality of fastening nails 51, the tail end of the fastening nail 51 is hinged with an extension rod 52, and the extension rod 52 is hinged with a lifting ring 53, and the inner diameter of the lifting ring 53 matches the diameter of the central axis 30; the top end of the central axis 30 is provided with an external thread and is screwed with an extrusion nut 54, and the extrusion nut 54 is used to squeeze the lifting ring 53 so that the fastening nail 51 penetrates outward.

[0074] Through the above arrangement, after pouring concrete to the top of the pile hole or after the concrete is dry, the top fixing ring 50 is installed in the steel cage 1, the lifting ring 53 is mounted on the central axis 30, and then the extrusion nut 54 is screwed into the central axis 30, and the extrusion nut 54 is screwed with a tool, and the lifting ring 53 is squeezed by the descending extrusion nut 54, so as to drive the extension rod 52 to descend and gradually turn to the horizontal, and the extension rod 52 that gradually turns to the horizontal squeezes the fastening nail 51 outward, so that the fastening nail 51 passes through the hole of the steel cage 1 and penetrates into the inner wall of the top of the pile hole 0, and the top of the steel cage 1 is further fixed. Combined with the fixation of the bottom penetration nail 20, the fixation of the central axis 30, the fixation of the expansion support plate 40 and the fixation of the top fastening nail 51, the steel cage 1 is fixed as a whole, thereby improving the fixing performance.

[0075] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A cast-in-place pile fixing device for building foundation construction, used for fixing a steel cage (1) in a pile hole (0), characterized in that: include: A bearing plate (10), the diameter of the bearing plate (10) matches the inner diameter of the steel cage (1), and the bearing plate (10) is used to bear concrete; A plurality of penetration nails (20), wherein the tail ends of the penetration nails (20) are hinged to the edge of the supporting plate (10); An elastic base (11), the elastic base (11) being used to contact the bottom of the pile hole (0); the elastic base (11) being connected to the bottom of the bearing plate (10) via an elastic member (111); a plurality of guide ramps (112) are provided on the top of the elastic base (11) around the elastic member (111); the guide ramps (112) correspond to the penetration nails (20) one by one; a guide slope (1121) is provided on the top surface of the guide ramp (112); the guide slope (1121) is located directly below the corresponding penetration nail (20); and the height of the guide slope gradually decreases in a direction away from the center of the bearing plate (10); When the elastic base (11) is in a natural state, all the penetration nails (20) are vertically retracted under the action of gravity; When the bearing plate (10) bears concrete to compress the elastic base (11), the head end of the penetration nail (20) slides along the corresponding guide inclined surface (1121) to make the penetration nail (20) turn to horizontal and extend in the radial direction of the bearing plate (10); The edge of the carrier plate (10) is provided with a plurality of grooves (12) along the radial direction, the grooves (12) corresponding to the penetration nails (20) one by one, the inner wall of the grooves (12) is provided with an extension groove (121) along the length direction, a rotating shaft (122) is slidably arranged in the extension groove (121), and the rotating shaft (122) is hinged with the tail end of the corresponding penetration nail (20); The guide ramp (112) is plate-shaped and can be inserted into the corresponding groove rail (12) to press the tail end of the corresponding penetration nail (20) so that the rotating shaft (122) slides along the extension groove (121).

2. A cast-in-place pile fixing device for building foundation construction according to claim 1, characterized in that: A regulating rope (22) is connected between the head ends of adjacent penetration nails (20).

3. A cast-in-place pile fixing device for building foundation construction according to claim 2, characterized in that: The portion of the guiding inclined surface (1121) close to the center of the carrier plate (10) is an inner concave inclined surface, and the portion of the guiding inclined surface (1121) away from the center of the carrier plate (10) is an outer convex inclined surface, and the inner concave inclined surface is smoothly connected to the outer convex inclined surface.

4. A cast-in-place pile fixing device for building foundation construction according to claim 1, characterized in that: A soft bearing tube (13) is arranged around the edge of the top surface of the bearing plate (10), and the outer diameter of the tube opening of the bearing tube (13) is larger than the diameter of the bearing plate (10) and slightly larger than the inner diameter of the steel cage; The opening ring of the supporting tube (13) is provided with an expansion limiting ring (131); A plurality of barbs (132) are provided at the edge of the tube opening of the bearing tube (13), and the barbs (132) can be hooked with the horizontal steel bars of the steel cage.

5. A cast-in-place pile fixing device for building foundation construction according to claim 1, characterized in that: It also includes a middle shaft (30), the bottom end of the middle shaft (30) being configured in the shape of a drill bit and having an external thread; A through hole matching the central axis (30) is provided in the middle of the carrier plate (10) and the middle of the elastic base (11), and the bottom of the central axis passes through the carrier plate (10) and the elastic base (11) in sequence; The central axis (30) is connected to a pressing plate (31), and the bottom surface of the pressing plate (31) is in contact with the top surface of the supporting plate (10).

6. A cast-in-place pile fixing device for building foundation construction according to claim 5, characterized in that: It also comprises a plurality of elastic expansion plates (40), wherein a through hole is opened in the middle of the expansion plate (40) so that the expansion plate (40) can slide along the central axis (30), and the plate surface of the expansion plate (40) is a conical surface. When the expansion plate (40) is in a natural state, the outer diameter of the expansion plate (40) matches the inner diameter of the steel cage.

7. A cast-in-place pile fixing device for building foundation construction according to claim 6, characterized in that: The central axis (30) is provided with a plurality of bone joints (301) along the length direction, and along the vertical downward direction, the sizes of all the bone joints (301) increase sequentially; The expansion support plate (40) corresponds to the bone joint portion (301) one by one, the size of the through hole in the middle of the expansion support plate (40) is smaller than the size of the corresponding bone joint portion (301), and larger than the size of all the bone joint portions (301) located above the corresponding bone joint portion (301); the bone joint portion (301) is truncated cone-shaped.

8. A cast-in-place pile fixing device for building foundation construction according to claim 6, characterized in that: The expansion support plate (40) comprises a mesh cone portion (41) located in the middle and a bearing ring (42) located at the edge, and a ring-shaped bearing groove (421) is provided on the top surface of the bearing ring (42).

9. A cast-in-place pile fixing device for building foundation construction according to claim 5, characterized in that: It also includes a top fixing ring (50), the outer diameter of the top fixing ring (50) matches the inner diameter of the steel cage, the top fixing ring (50) is slidably connected to a plurality of fastening nails (51) in the radial direction, the tail ends of the fastening nails (51) are pivotally hinged with extension rods (52), the extension rods (52) are pivotally hinged with a lifting ring (53), and the inner diameter of the lifting ring (53) matches the diameter of the middle shaft (30); The top end of the central shaft (30) is provided with an external thread and is screwed with an extrusion nut (54). The extrusion nut (54) is used to squeeze the lifting ring (53) so that the fastening nail (51) protrudes outward.

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