Construction device for pure steel strand cast-in-situ bored pile

Abstract

The utility model relates to a construction device for a pure steel strand cast-in-situ bored pile, which comprises a positioning disc, a counterweight disc, a stirrup fixing device, a stirrup lowering device, an annular stirrup component and a steel strand, and a circle of steel strand positioning holes are formed in the positioning disc at certain intervals; the counterweight disc is correspondingly arranged below the positioning disc, and a steel strand anchoring hole is formed in the counterweight disc; the stirrup fixing device comprises a fixed rod piece and a movable fastener, the movable fastener can vertically slide along the fixed rod piece, and one end of the fixed rod piece is fixed to the bottom face of the positioning disc. The stirrup lowering device comprises a telescopic rod piece and a rotary shifting piece, the top end of the telescopic rod piece is connected with the fixed rod piece, and the bottom end of the telescopic rod piece is connected with the rotary shifting piece; the annular stirrup assembly comprises an annular stirrup and a stirrup fixing piece, a fixing ring is arranged on the side face of the stirrup fixing piece, the fixing ring is connected with the movable fastener, and the annular stirrup is stacked in the stirrup fixing piece; the steel strand sequentially penetrates through the positioning disc, the annular stirrup assembly and the balance weight disc from top to bottom and then is fixed through an anchorage device.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground engineering, and particularly relates to a construction device for a pure steel strand bored cast-in-place pile. Background Technique

[0002] 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 building. Due to the limitations of height and space in indoor construction, it is impossible to bind and hoist a complete steel reinforcement cage into the hole. According to the traditional method of making steel reinforcement cages, only the method of sectional binding, sectional hoisting and welding section by section can be adopted. This construction method has obvious problems, that is, low efficiency, long time consumption, and high labor and material costs.

[0003] Therefore, how to provide a construction device for a pure steel strand bored cast-in-place pile to provide a reliable method for pile foundation construction inside old buildings and historical buildings, and for pile foundation construction under height restrictions or low clearance conditions such as under bridges, corridors and in tunnels is a technical problem that needs to be solved urgently by those skilled in the art. Content of the Utility Model

[0004] The utility model provides a construction device for a pure steel strand bored cast-in-place pile, which utilizes the relatively flexible characteristics of steel strands to directly bind a steel strand reinforcement cage in a low clearance environment, and uses a counterweight to lower the reinforcement cage. Compared with the traditional method of making steel reinforcement cages, this method can solve the problems of pile foundation construction under low clearance and limited space conditions, and has high construction efficiency, short time consumption, and low labor and material costs.

[0005] To solve the above technical problems, the utility model includes the following technical solutions:

[0006] A construction device for a pure steel strand bored cast-in-place pile, used for the construction of a steel strand reinforcement cage, includes:

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

[0008] A counterweight plate, which is correspondingly arranged below the positioning plate, and the counterweight plate is provided with steel strand anchoring holes;

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

[0010] A stirrup lowering device, which includes a telescopic rod and a rotating dial, the top end of the telescopic rod is connected to the fixing rod, and the bottom end of the telescopic rod is connected to the rotating dial;

[0011] Circular stirrup assembly, the circular stirrup assembly includes a circular stirrup and a stirrup fixing member, a fixing ring is provided on the side of the stirrup fixing member, the fixing ring is connected to the movable fastener, and the circular stirrup is stacked in the stirrup fixing member;

[0012] Steel strand, the steel strand passes through the positioning disc, the circular stirrup assembly and the counterweight disc in sequence from top to bottom, and is fixed by an anchor.

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

[0014] Further, there are four groups of the stirrup fixing members and they are arranged corresponding to the stirrup fixing devices. Two groups of the stirrup fixing members are fixing members with openings at the bottom and on the side, and the other two groups of the stirrup fixing members are fixing members with openings at the bottom.

[0015] Further, the space of the side opening of the stirrup fixing member satisfies that the rotating dial can extend into and can stir a single stirrup.

[0016] Further, the steel strand is stacked in a coiled state around the pile hole of the bored cast-in-place pile.

[0017] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0018] The present utility model provides a construction device for a pure steel strand bored cast-in-place pile, which includes a positioning disc, a counterweight disc, a stirrup fixing device, a stirrup lowering device, a circular stirrup assembly and a steel strand. A circle of steel strand positioning holes are arranged on the positioning disc at a certain interval; the counterweight disc is correspondingly arranged below the positioning disc, and a steel strand anchoring hole is provided on the counterweight disc; the stirrup fixing device includes a fixing rod and a movable fastener, the movable fastener can vertically slide along the fixing rod, and one end of the fixing rod is fixed to the bottom surface of the positioning disc; the stirrup lowering device includes a telescopic rod member and a rotating dial, the top end of the telescopic rod member is connected to the fixing rod, and the bottom end of the telescopic rod member is connected to the rotating dial; the circular stirrup assembly includes a circular stirrup and a stirrup fixing member, a fixing ring is provided on the side of the stirrup fixing member, the fixing ring is connected to the movable fastener, and the circular stirrup is stacked in the stirrup fixing member; the steel strand passes through the positioning disc, the circular stirrup assembly and the counterweight disc in sequence from top to bottom, and is fixed by an anchor. The construction device for the pure steel strand bored cast-in-place pile provided by the present utility model uses the steel strand as the longitudinal reinforcement of the steel cage. Due to the relative flexibility of the steel strand, pile foundation construction can be carried out under the conditions of low headroom and limited space. The construction speed is fast. The operator only needs to carry out the connection and binding work of the stirrup and the steel strand, which can be completed by an automatic wire tying tool, and the whole steel cage can be lowered without large machinery; the automation degree is high, the rotating dial automatically completes the lowering of the stirrup, and the counterweight disc can solve the problems of the steel strand steel cage tilting and being unable to be tensioned and stretched in the mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Structural schematic diagram of the construction device for a pure steel strand bored cast-in-place pile in an embodiment of the present utility model;

[0020] Figure 2 Structural schematic diagram of the stirrup fixing device and the stirrup lowering device in the construction device for a pure steel strand bored cast-in-place pile in an embodiment of the present utility model;

[0021] Figure 3 Structural schematic diagram of the circular stirrup assembly in the construction device for a pure steel strand bored cast-in-place pile in an embodiment of the present utility model;

[0022] Figure 4 Bottom sectional view of the stirrup fixing piece in the construction device for a pure steel strand bored cast-in-place pile in an embodiment of the present utility model;

[0023] Figure 5 Top view of the positioning plate in the construction device for a pure steel strand bored cast-in-place pile in an embodiment of the present utility model;

[0024] Figure 6 Top view of the counterweight plate in the construction device for a pure steel strand bored cast-in-place pile in an embodiment of the present utility model.

[0025] In the figure:

[0026] 1 - positioning plate, 2 - positioning hole, 3 - counterweight plate, 4 - anchoring hole, 5 - stirrup fixing device, 6 - fixing rod, 7 - movable fastener, 8 - stirrup lowering device, 9 - telescopic rod, 10 - rotating dial, 11 - circular stirrup assembly, 12 - circular stirrup, 13 - stirrup fixing piece, 14 - fixing ring, 15 - steel strand, 16 - anchor, 17 - flexible limit. Specific embodiments

[0027] The following further details a construction device for a pure steel strand bored cast-in-place pile provided by the present utility model in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model. For the convenience of description, the "upper" and "lower" described hereinafter are in the same direction as the upper and lower of the accompanying drawings, but this cannot be a limitation to the technical solution of the present utility model.

[0028] Embodiment 1

[0029] The following combines Figures 1 to 6 , and details the structural composition of the construction device for a pure steel strand bored cast-in-place pile.

[0030] Please refer to Figures 1 to 6A construction device for pure steel strand bored piles includes 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. The positioning plate 1 is provided with a circle of steel strand positioning holes 2 at a certain interval; the counterweight plate 3 is correspondingly arranged below the positioning plate 1, and the counterweight plate 3 is provided with steel strand anchor holes 4; the stirrup fixing device 5 includes a fixed rod 6 and a movable fastener 7. The movable fastener 7 can slide vertically along the fixed rod 6. 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 annular stirrups 12 and stirrup fixings 13. The stirrup fixings 13 are provided with a fixing ring 14 on the side. The fixing ring 14 is connected to the movable fastener 7. The annular stirrups 12 are stacked in the stirrup fixings 13. The steel strands 15 pass through the positioning plate 1, the annular stirrup assembly 11 and the counterweight plate 3 from top to bottom, and are fixed by the anchor 16. The precast concrete counterweight plate 3 is an annular component with a circular hole, namely the steel strand anchor hole 4, at the designed longitudinal reinforcement position to facilitate the passage of the steel strand 15. 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 mud and concrete materials during hole cleaning and concrete pouring.

[0031] In this embodiment, more preferably, four sets of stirrup fixing devices 5 are symmetrically arranged below the positioning plate 1 .

[0032] In this embodiment, more preferably, there are four sets of stirrup fixings 13, which are arranged corresponding to the stirrup fixing devices 5. Two sets of stirrup fixings 13 are bottom- and side-opening fixings, and the other two sets of stirrup fixings 13 are bottom-opening fixings. Flexible limiters are provided on both sides of the bottom opening of the stirrup fixings 13. When the annular stirrups 12 are toggled by the rotating paddle 10, they can fall through the flexible limiters and disengage from the stirrup fixings 13. When the annular stirrups 12 are not toggled, they will be confined in the stirrup fixings 13. The other two sets of stirrup fixings 13 are bottom-opening fixings without side openings, and are provided with flexible limiters 17, also arranged symmetrically.

[0033] 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 .

[0034] In this embodiment, more preferably, the steel strands 15 are stacked in a coiled state around the bored pile holes.

[0035] Please continue to refer to Figures 1 to 6 This embodiment also provides a construction method for pure steel strand bored piles, the construction method comprising the following steps:

[0036] Step S1: Prepare the construction device for the pure steel strand bored cast-in-place pile in reserve.

[0037] Step S2: Erect a positioning plate 1 above the pile hole of the bored cast-in-place pile, and pass the steel strand 15 through the steel strand positioning hole 2 of the positioning plate 1.

[0038] Step S3: Slip a ring-shaped stirrup assembly 11 around the steel strand 15, adjust the position of the movable fastener 7, connect the fixed ring 14 to the movable fastener 7, and at the same time adjust the length of the telescopic member 9 to align with the openings at the bottom and side of the stirrup fixing member 13. Set the rotation speed of the rotary paddle 10, and the speed of the rotary paddle 10 is set according to the lowering speed of the steel strand 15 and the designed spacing of the ring-shaped stirrup 12. Lower the ring-shaped stirrup 12 automatically at a certain time interval.

[0039] Step S4: Pass the steel strand 15 through the counterweight plate 3 and fix it with an anchor 16.

[0040] Step S5: Lower the steel strand 15 synchronously. Under the gravity of the counterweight plate 3, the steel strand 15 is driven to move downward into the pile hole of the bored cast-in-place pile, and the rotary paddle 10 is opened to lower the ring-shaped stirrup 12 automatically at a certain time interval, completing the binding of the ring-shaped stirrup 12 and the steel strand 15, thus forming a steel strand reinforcement cage.

[0041] Step S6: After the steel strand reinforcement cage is completely lowered to the specified depth, clean the hole and pour concrete to complete the construction of the pure steel strand bored cast-in-place pile.

[0042] The above example is a preferred embodiment of the present invention, but the embodiments of the present invention are not limited by the above examples. The above-described embodiments only represent several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A pure steel strand bored pile construction device for steel strand reinforcement cage construction, characterized in that: include: A positioning plate, on which a circle of steel strand positioning holes is arranged at a certain interval; A counterweight plate, the counterweight plate being correspondingly arranged below the positioning plate, and the counterweight plate being provided with a steel strand anchoring hole; A stirrup fixing device, the stirrup fixing device comprising a fixed rod and a movable fastener, the movable fastener being able to slide vertically along the fixed rod, one end of the fixed rod being fixed to the bottom surface of the positioning plate; A stirrup lowering device, comprising a telescopic rod and a rotating paddle, wherein 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 being provided on a side of the stirrup fixing piece, the fixing ring being connected to the movable fastener, and the annular stirrup being 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; there are four groups of stirrup fixing parts and they are arranged corresponding to the stirrup fixing devices, two groups of stirrup fixing parts are bottom and side opening fixing parts, and the other two groups of stirrup fixing parts are bottom opening fixing parts.

2. The construction device for pure steel strand bored pile according to claim 1, characterized in that: 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.

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

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