A pure steel strand bored pile construction device and method

Abstract

The present invention relates to a pure steel strand bored cast-in-place pile construction device and method. The device comprises a positioning plate, a counterweight plate, a stirrup fixing device, a stirrup lowering device, an annular stirrup assembly and a steel strand, wherein a circle of steel strand positioning holes are arranged on the positioning plate at a certain interval; the counterweight plate is correspondingly arranged below the positioning plate, and a steel strand anchoring hole is arranged on the counterweight plate; the stirrup fixing device comprises a fixed rod and a movable fastener, the movable fastener can slide vertically along the fixed rod, and one end of the fixed rod is fixed to the bottom surface of the positioning plate; the stirrup lowering device comprises a telescopic rod and a rotating paddle, the top end of the telescopic rod is connected to the fixed rod, and the bottom end of the telescopic rod is connected to the rotating paddle; the annular stirrup assembly comprises annular stirrups and a stirrup fixing piece, a fixing ring is arranged on the side of the stirrup fixing piece, the fixing ring is connected to the movable fastener, and the annular stirrups are stacked in the stirrup fixing piece; the steel strand passes through the positioning plate, the annular stirrup assembly and the counterweight plate in sequence from top to bottom, and is fixed by an anchor.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering, and particularly relates to a pure steel strand bored pile construction device and method. Background Art

[0002] In recent years, with the continuous promotion of the concept of urban renewal, urban development has gradually shifted from large-scale demolition and construction to organic renewal. At present, the repair, renovation and redevelopment of existing old buildings and historical buildings have become the main direction of urban renewal. The renovation of existing buildings often requires pile foundation construction inside the preserved building. Due to the height and space limitations of indoor construction, it is impossible to tie and hoist the complete steel cage into the hole. According to the traditional steel cage production method, only segmented tying, segmented hoisting, and segment-by-segment welding can be adopted. This construction method has obvious problems, namely low efficiency, long time consumption, and high labor and material costs.

[0003] Therefore, how to provide a pure steel strand bored cast-in-place pile construction device and method to provide a reliable method for pile foundation construction inside old buildings and historical buildings, and for pile foundation construction under height-restricted or low-clearance conditions such as under bridges, corridors, and in tunnels, is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The present invention provides a pure steel strand bored pile construction device and method, which utilizes the relatively flexible characteristics of steel strands to directly tie steel strand reinforcement cages in a low headroom environment, and uses a counterweight to lower the reinforcement cages. Compared with the traditional reinforcement cage production method, this method can solve the problem of pile foundation construction under low headroom and limited space conditions, and has high construction efficiency, short time consumption, and low labor and material costs.

[0005] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0006] A pure steel strand bored pile construction device, used for steel strand reinforcement cage construction, comprising:

[0007] A positioning plate, on which a circle of steel strand positioning holes are arranged at a certain interval;

[0008] A counterweight plate, the counterweight plate is arranged correspondingly below the positioning plate, and the counterweight plate is provided with a steel strand anchor hole;

[0009] A stirrup fixing device, the stirrup fixing device comprising a fixed rod and a movable fastener, the movable fastener can slide vertically along the fixed rod, and one end of the fixed rod is fixed to the bottom surface of the positioning plate;

[0010] A stirrup lowering device, the stirrup lowering device comprising a telescopic rod and a rotating paddle, the top end of the telescopic rod is connected to the fixed rod, and the bottom end of the telescopic rod is connected to the rotating paddle;

[0011] An annular stirrup assembly, the annular stirrup assembly comprising an annular stirrup and a stirrup fixing piece, a fixing ring is provided on the side of the stirrup fixing piece, the fixing ring is connected to the movable fastener, and the annular stirrup is stacked in the stirrup fixing piece;

[0012] The steel strand passes through the positioning plate, the annular hoop assembly and the counterweight plate from top to bottom in sequence and is then fixed by an anchor.

[0013] Furthermore, the four groups of stirrup fixing devices are symmetrically arranged below the positioning plate.

[0014] Furthermore, there are four groups of stirrup fixings and they are arranged corresponding to the stirrup fixing devices, wherein two groups of stirrup fixings are bottom and side opening fixings, and the other two groups of stirrup fixings are bottom opening fixings.

[0015] Furthermore, the space of the side opening of the stirrup fixing piece is sufficient for the rotating paddle to extend into and move a single stirrup.

[0016] Furthermore, the steel strands are stacked in a coiled state around the bored pile holes.

[0017] The present invention also provides a construction method for pure steel strand bored piles, the construction method comprising the following steps:

[0018] Step S1, providing the construction device of the pure steel strand bored pile for standby;

[0019] Step S2, setting a positioning plate above the bored pile hole, and passing the steel strand through the steel strand positioning hole of the positioning plate;

[0020] Step S3, inserting the annular stirrup assembly around the steel strand, adjusting the position of the movable fastener, connecting the fixed ring with the movable fastener, adjusting the length of the telescopic rod, aligning the openings at the bottom and side of the stirrup fixing piece, and setting the rotation speed of the rotating paddle;

[0021] Step S4, the steel strand passes through the counterweight plate and is fixed with an anchor;

[0022] Step S5, the steel strands are lowered synchronously, and the steel strands are driven downward into the bored pile hole by the gravity of the counterweight plate, and the rotating paddle is opened to automatically lower the annular stirrups at a certain time interval to complete the binding of the annular stirrups and the steel strands, thereby forming a steel strand reinforcement cage;

[0023] Step S6: After the steel strand reinforcement cage is completely lowered to the specified depth, the hole is cleaned and concrete is poured to complete the pure steel strand bored cast-in-place pile construction.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] The invention provides a construction device for bored piles of pure steel strands, comprising a positioning plate, a counterweight plate, a stirrup fixing device, a stirrup lowering device, an annular stirrup assembly and steel strands, wherein a circle of steel strand positioning holes is provided on the positioning plate at a certain interval; the counterweight plate is correspondingly arranged below the positioning plate, and a steel strand anchoring hole is provided on the counterweight plate; the stirrup fixing device comprises a fixed rod and a movable fastener, the movable fastener can slide vertically along the fixed rod, and one end of the fixed rod is fixed to the bottom surface of the positioning plate; the stirrup lowering device comprises a telescopic rod and a rotating paddle, the top end of the telescopic rod is connected to the fixed rod, and the bottom end of the telescopic rod is connected to the rotating paddle; the annular stirrup assembly comprises annular stirrups and a stirrup fixing piece, a fixing ring is provided on the side of the stirrup fixing piece, the fixing ring is connected to the movable fastener, and the annular stirrups are stacked in the stirrup fixing piece; the steel strand passes through the positioning plate, the annular stirrup assembly and the counterweight plate in sequence from top to bottom, and is fixed by an anchor. The pure steel strand bored cast-in-place pile construction device provided by the present invention uses the steel strand as the longitudinal reinforcement of the steel cage and utilizes the relative flexibility of the steel strand to carry out pile foundation construction under conditions of low headroom and limited space. The construction speed is fast, and the operator only needs to connect and tie the stirrups and the steel strand, which can be completed by an automatic wire tying tool, and the entire steel cage can be lowered without large machinery; the degree of automation is high, and the rotating paddle automatically completes the lowering of the stirrups, and the counterweight plate can solve the problem that the steel strand steel cage is tilted in the mud and cannot be tensioned and stretched. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a construction device for pure steel strand bored piles according to an embodiment of the present invention;

[0027] Figure 2 It is a schematic structural diagram of a stirrup fixing device and a stirrup lowering device in a construction device for pure steel strand bored piles according to an embodiment of the present invention;

[0028] Figure 3 It is a schematic structural diagram of an annular stirrup assembly in a construction device for pure steel strand bored piles according to an embodiment of the present invention;

[0029] Figure 4 It is a bottom cross-sectional view of a stirrup fixing member in a construction device for pure steel strand bored piles according to an embodiment of the present invention;

[0030] Figure 5 It is a top view of a positioning plate in a construction device for pure steel strand bored piles according to an embodiment of the present invention;

[0031] Figure 6 The figure is a top view of a counterweight plate in a construction device for pure steel strand bored piles according to an embodiment of the present invention.

[0032] In the figure:

[0033] 1-positioning plate, 2-positioning hole, 3-counterweight plate, 4-anchor hole, 5-stirrup fixing device, 6-fixing rod, 7-movable fastener, 8-stirrup lowering device, 9-telescopic rod, 10-rotating paddle, 11-annular stirrup assembly, 12-annular stirrup, 13-stirrup fixing part, 14-fixing ring, 15-steel strand, 16-anchor, 17-flexible limiter. DETAILED DESCRIPTION

[0034] The following is a further detailed description of a pure steel strand bored pile construction device and method provided by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the accompanying drawings, but this cannot be a limitation of the technical solution of the present invention. Embodiment 1

[0035] Combine the following Figures 1 to 6 , and detailed description of the structural composition of the construction device of pure steel strand bored piles.

[0036] Please refer to Figures 1 to 6A construction device for pure steel strand bored piles, comprising a positioning plate 1, a counterweight plate 3, a stirrup fixing device 5, a stirrup lowering device 8, an annular stirrup assembly 11 and a steel strand 15, wherein a circle of steel strand positioning holes 2 are arranged on the positioning plate 1 at a certain interval; the counterweight plate 3 is correspondingly arranged below the positioning plate 1, and a steel strand anchoring hole 4 is arranged on the counterweight plate 3; the stirrup fixing device 5 comprises a fixed rod 6 and a movable fastener 7, the movable fastener 7 can slide vertically along the fixed rod 6, and one end of the fixed rod 6 is fixed to the bottom of the positioning plate 1 The stirrup lowering device 8 includes a telescopic rod 9 and a rotating paddle 10. The top of the telescopic rod 9 is connected to the fixed rod 6, and the bottom of the telescopic rod 9 is connected to the rotating paddle 10. The annular stirrup assembly 11 includes an annular stirrup 12 and a stirrup fixing member 13. The stirrup fixing member 13 is provided with a fixing ring 14 on the side. The fixing ring 14 is connected to the movable fastener 7. The annular stirrup 12 is stacked in the stirrup fixing member 13. The steel strand 15 passes through the positioning plate 1, the annular stirrup assembly 11 and the counterweight plate 3 from top to bottom in sequence, and is fixed by the anchor 16. The precast concrete counterweight plate 3 is an annular component with a circular hole, i.e., the steel strand anchor hole 4, at the designed longitudinal reinforcement position to facilitate the steel strand 15 to pass through. The weight of the counterweight plate 3 is used to ensure the verticality of the steel strand reinforcement cage in the mud and to ensure that the steel strand 15 is in a tensioned state. When the counterweight plate 3 sinks, the mud flows upward from the middle hole, reducing the sinking resistance and facilitating the flow and filling of the mud and concrete materials during hole cleaning and concrete pouring.

[0037] In this embodiment, more preferably, four sets of stirrup fixing devices 5 are symmetrically arranged below the positioning plate 1 .

[0038] In this embodiment, more preferably, there are four groups of stirrup fixings 13 and they are arranged corresponding to the stirrup fixing device 5, of which two groups of stirrup fixings 13 are bottom and side opening fixings, and the other two groups of stirrup fixings 13 are bottom opening fixings. Flexible limiters are provided on both sides of the bottom opening of the stirrup fixings 13, and when the annular stirrup 12 is toggled by the rotating paddle 10, it can fall down through the flexible limiter and detach from the stirrup fixings 13. When the annular stirrup 12 is not toggled, it will be confined in the stirrup fixings 13. The other two groups of stirrup fixings 13 are bottom opening fixings, without side openings, and are provided with flexible limiters 17, which are also symmetrically arranged.

[0039] In this embodiment, more preferably, the space of the side opening of the stirrup fixing piece 13 is sufficient for the rotating paddle 10 to extend into and move a single annular stirrup 12 .

[0040] In this embodiment, more preferably, the steel strands 15 are stacked around the bored pile holes in a coiled state.

[0041] Please continue to refer to Figures 1 to 6 The present invention also provides a construction method of pure steel strand bored piles, the construction method comprising the following steps:

[0042] Step S1, providing the construction device of the pure steel strand bored pile for standby;

[0043] Step S2, setting a positioning plate 1 above the bored pile hole, and passing the steel strand 15 through the steel strand positioning hole 2 of the positioning plate 1;

[0044] Step S3, insert the annular stirrup assembly 11 around the steel strand 15, adjust the position of the movable fastener 7, connect the fixing ring 14 with the movable fastener 7, adjust the length of the telescopic rod 9, align the bottom and side openings of the stirrup fixing member 13, set the rotation speed of the rotating paddle 10, and set the speed of the rotating paddle 10 according to the lowering speed of the steel strand 15 and the designed spacing of the annular stirrup 12, and automatically lower the annular stirrup 12 at a certain time interval;

[0045] Step S4, the steel strand 15 passes through the counterweight plate 3 and is fixed by an anchor 16;

[0046] Step S5, the steel strands 15 are lowered synchronously, and the steel strands 15 are driven downward into the bored pile hole by the gravity of the counterweight plate 3, and the rotating paddle 10 is opened to automatically lower the annular stirrups 12 at a certain time interval, completing the binding of the annular stirrups 12 and the steel strands 15, thereby forming a steel strand reinforcement cage;

[0047] Step S6: After the steel strand reinforcement cage is completely lowered to the specified depth, the hole is cleaned and concrete is poured to complete the pure steel strand bored cast-in-place pile construction.

[0048] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only express several embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pure steel strand bored pile construction device, used for steel strand reinforcement cage construction, characterized in that: include: A positioning plate, on which a circle of steel strand positioning holes are arranged at a certain interval; A counterweight plate, the counterweight plate is arranged correspondingly below the positioning plate, and the counterweight plate is provided with a steel strand anchor hole; A stirrup fixing device, the stirrup fixing device comprising a fixed rod and a movable fastener, the movable fastener can slide vertically along the fixed rod, and one end of the fixed rod is fixed to the bottom surface of the positioning plate; A stirrup lowering device, the stirrup lowering device comprising a telescopic rod and a rotating paddle, the top end of the telescopic rod is connected to the fixed rod, and the bottom end of the telescopic rod is connected to the rotating paddle; An annular stirrup assembly, the annular stirrup assembly comprising an annular stirrup and a stirrup fixing piece, a fixing ring is provided on the side of the stirrup fixing piece, the fixing ring is connected to the movable fastener, and the annular stirrup is stacked in the stirrup fixing piece; The steel strands are passed through the positioning plate, the annular stirrup assembly and the counterweight plate in sequence from top to bottom and then fixed by anchors; The four groups of stirrup fixing devices are symmetrically arranged below the positioning plate; the stirrup fixing pieces are arranged corresponding to the stirrup fixing devices, two groups of stirrup fixing pieces are bottom and side opening fixing pieces, and the other two groups of stirrup fixing pieces are bottom opening fixing pieces, and flexible limiters are provided on both sides of the bottom opening of the stirrup fixing pieces; the space of the side opening of the stirrup fixing piece is sufficient for the rotating paddle to extend into and can move a single stirrup.

2. The construction device for pure steel strand bored pile according to claim 1 is characterized in that: The steel strands are stacked in a coiled state around the bored pile holes.

3. A construction method for pure steel strand bored piles, characterized in that: The steps include: Step S1, providing a construction device for the pure steel strand bored pile according to claim 1 or 2 for standby use; Step S2, setting a positioning plate above the bored pile hole, and passing the steel strand through the steel strand positioning hole of the positioning plate; Step S3, inserting the annular stirrup assembly around the steel strand, adjusting the position of the movable fastener, connecting the fixed ring with the movable fastener, adjusting the length of the telescopic rod, aligning the openings at the bottom and side of the stirrup fixing piece, and setting the rotation speed of the rotating paddle; Step S4, the steel strand passes through the counterweight plate and is fixed with an anchor; Step S5, the steel strands are lowered synchronously, and the steel strands are driven downward into the bored pile hole by the gravity of the counterweight plate, and the rotating paddle is opened to automatically lower the annular stirrups at a certain time interval to complete the binding of the annular stirrups and the steel strands, thereby forming a steel strand reinforcement cage; Step S6: After the steel strand reinforcement cage is completely lowered to the specified depth, the hole is cleaned and concrete is poured to complete the pure steel strand bored cast-in-place pile construction.

Images