Pile top critical surface concrete preset isolation device

Abstract

The utility model belongs to the field of engineering construction, and particularly relates to a pile top critical surface concrete preset isolation device which comprises outer stirrups and inner stirrups, a plurality of fan-shaped steel plates are arranged between the outer stirrups and the inner stirrups, and the fan-shaped steel plates are fixedly connected with the outer stirrups and the inner stirrups through U-shaped buckles A; two semicircular plates are arranged in the inner stirrup, a U-shaped buckle B is fixedly connected to the middle of the outer arc edge of each semicircular plate, and a stop lever is fixed to the end of an opening of each U-shaped buckle B; a small hole is formed in the straight edge of the semicircular plate, a pull rope is fixed in the small hole, and the upper end of the pull rope is fixed to the portion, above the steel casing, of the transverse rod. By means of the device, drilling, steel chisel knocking vibration and other work can be avoided, the work intensity of workers is reduced, the construction period is effectively shortened, the construction cost is saved, the construction efficiency is improved, the top face of a dismantled pile head pile foundation is flat and smooth, subsequent pile foundation tests are facilitated, and later finishing work is omitted.

Description

Technical Field

[0001] The utility model belongs to the field of engineering construction, and particularly relates to a device for presetting isolation of concrete at the pile top interface. Background Technique

[0002] In the existing pile head demolition construction, generally, the pile top position is first cut circumferentially, then the circumferential concrete outside the pile top and the concrete of the upper main reinforcement are peeled off, then holes are drilled horizontally into the concrete, and then steel bars are inserted into the holes and repeatedly knocked to separate the upper and lower layers of concrete, and finally the upper layer of concrete is hoisted out. At present, this method not only has a high working intensity for workers and low construction efficiency, but also the concrete at the pile top interface is uneven and needs to be trimmed later. Summary of the Invention

[0003] The problem to be solved by the present invention is to overcome the deficiencies of the background technique and provide a device for presetting isolation of concrete at the pile top interface.

[0004] The present invention is realized by the following technical solutions:

[0005] A device for presetting isolation of concrete at the pile top interface includes an outer stirrup and an inner stirrup. The outer stirrup and the inner stirrup are on the same horizontal plane. The inner diameter of the outer stirrup is equal to the outer diameter of the steel reinforcement cage. The outer stirrup is sleeved and fixed outside the main reinforcement of the pile top of the steel reinforcement cage. The inner stirrup is located at the middle position inside the steel reinforcement cage, and the inner diameter of the inner stirrup is larger than the diameter of the conduit. A number of sector-shaped steel plates are arranged between the outer stirrup and the inner stirrup. The number of sector-shaped steel plates forms a ring. Bolt holes are provided on both the outer arc edge and the inner arc edge of the sector-shaped steel plate. The outer arc edge and the inner arc edge of the sector-shaped steel plate are respectively fixedly connected to the outer stirrup and the inner stirrup through U-shaped clips A. The bolts of the U-shaped clips A pass through the bolt holes. Two semi-circular plates are arranged inside the inner stirrup. The two semi-circular plates form a circle. The middle of the outer arc edge of the semi-circular plate is fixedly connected to a U-shaped clip B. A stop bar is fixedly arranged at the open end of the U-shaped clip B. The stop bar is located below the semi-circular plate and is parallel to the straight edge of the semi-circular plate. The closed end of the U-shaped clip B is located in the gap between the inner stirrup and the sector-shaped steel plate. The closed end of the U-shaped clip B is clamped on the inner stirrup, and the closed end of the U-shaped clip B can rotate around the inner stirrup. Small holes are provided on the straight edge of the semi-circular plate. A pull rope is fixed in the small holes. The upper end of the pull rope is fixed on a cross bar. The cross bar is placed on the upper surface of the steel casing.

[0006] Preferably, the outer stirrup is welded or fixed to the main reinforcement of the pile top of the steel reinforcement cage by wire binding.

[0007] Preferably, the cross bar is provided with a round hole, and the pull rope passes through the round hole.

[0008] Preferably, two small holes are symmetrically provided on the straight edge of the semi-circular plate.

[0009] Preferably, the diameter of the small hole is 3 mm.

[0010] Preferably, the inner stirrup has a diameter of 400 mm.

[0011] The device of the present invention can avoid operations such as drilling, steel rod knocking and vibration, reduce the working intensity of workers, effectively shorten the construction period, save construction costs, improve construction efficiency. At the same time, the pile top of the pile foundation demolished by using this device is flat and smooth, which is convenient for subsequent pile foundation tests and eliminates the need for subsequent trimming work. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the construction state of this embodiment;

[0013] Figure 2 It is an enlarged schematic structural diagram of this embodiment;

[0014] Figure 3 It is a schematic structural diagram of the device of this embodiment;

[0015] Figure 4 It is a schematic structural diagram of the natural drooping of the semi-circular plate of this embodiment;

[0016] Figure 5 It is an enlarged schematic structural diagram of the semi-circular plate of this embodiment.

[0017] In the figure, 1 is the outer stirrup, 2 is the inner stirrup, 3 is the main reinforcement, 4 is the sector steel plate, 5 is the U-shaped buckle A, 6 is the semi-circular plate, 7 is the U-shaped buckle B, 8 is the stop bar, 9 is the small hole, 10 is the pulling rope, 11 is the cross bar, 12 is the steel casing, and 13 is the round hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0019] The concrete preset isolation device for the pile top interface of this embodiment includes an outer stirrup 1 and an inner stirrup 2. The outer stirrup 1 is sleeved outside the steel reinforcement cage, and the inner stirrup 2 is placed inside the steel reinforcement cage. Both the outer stirrup 1 and the inner stirrup 2 are located at the pile top position of the steel reinforcement cage, and the outer stirrup 1 and the inner stirrup 2 are on the same horizontal plane. The inner diameter of the outer stirrup 1 is exactly equal to the outer diameter of the steel reinforcement cage. The outer stirrup 1 is fixed to the main reinforcement 3 at the pile top of the steel reinforcement cage. The outer stirrup 1 can be directly welded to the main reinforcement 3. In order to be able to recycle the outer stirrup 1, more preferably, the outer stirrup 1 can be directly fixed to the main reinforcement 3 by wire or fasteners, etc. The inner stirrup 2 is located in the middle position inside the steel reinforcement cage. The inner diameter of the inner stirrup 2 is larger than the diameter of the conduit for concrete pouring. Generally, the diameter of the conduit for concrete pouring is 300 mm. Therefore, it is preferred that the inner stirrup 2 has a diameter of 400 mm, slightly larger than the diameter of the conduit.

[0020] Connect a number of sector-shaped steel plates 4 between the outer stirrup 1 and the inner stirrup 2. The number of sector-shaped steel plates 4 form a ring to block the gap between the outer stirrup 1 and the inner stirrup 2. Bolt holes are provided on both the outer arc side and the inner arc side of the sector-shaped steel plate 4. The outer arc side and the inner arc side of the sector-shaped steel plate 4 are respectively fixedly connected to the outer stirrup 1 and the inner stirrup 2 through U-shaped fasteners A5. The bolts of the U-shaped fasteners A5 pass through the bolt holes of the sector-shaped steel plate 4 and are fixed to the sector-shaped steel plate 4. The bolts are not drawn in the attached drawings.

[0021] Two semi-circular plates 6 are arranged inside the inner stirrup 2. The two semi-circular plates 6 form a circle and are used to block the pores of the inner stirrup 2. A U-shaped fastener B7 is fixedly connected to the middle of the outer arc side of the semi-circular plate 6. The closed end of the U-shaped fastener B7 is located in the gap between the inner stirrup 2 and the sector-shaped steel plate 4. The closed end of the U-shaped fastener B7 is clamped on the inner stirrup 2, and the closed end of the U-shaped fastener B7 can rotate around the inner stirrup 2, so that the U-shaped fastener B7 can drive the semi-circular plate 6 to rotate. When both semi-circular plates 6 are rotated to the horizontal state, the internal space of the inner stirrup 2 can be blocked. To prevent the semi-circular plate 6 from continuing to rotate after being rotated to the horizontal state, a stop rod 8 is fixedly connected to the open end of the U-shaped fastener B7. The stop rod 8 can be directly fixed to the U-shaped fastener B7 through the bolt of the U-shaped fastener B7. The stop rod 8 is located below the semi-circular plate 6 and is parallel to the straight edge of the semi-circular plate 6. Both ends of the stop rod 8 are located outside the inner stirrup 2. When the semi-circular plate 6 is rotated to the horizontal state, the stop rod 8 is blocked by the inner stirrup 2, thus preventing the U-shaped fastener B7 and the semi-circular plate 6 from continuing to rotate upward.

[0022] Two small holes 9 are symmetrically arranged on the straight edge of the semi-circular plate 6. The diameter of the small holes 9 is 3 mm. A pull rope 10 is fixed in the small holes 9. The upper end of the pull rope 10 is fixed to the cross bar 11. The cross bar 11 is placed on the upper surface of the steel protection cylinder 12 of the steel reinforcement cage. The pull rope 10 is used to pull the semi-circular plate 6 to rotate. A round hole 13 can be provided on the cross bar 11, and the pull rope 10 passes through the round hole 13 and then is wound and fixed on the cross bar 11.

[0023] During use, before concrete pouring, a release agent is evenly applied to the outer surface of the device of the present invention. The outer stirrup 1 is fixed to the main reinforcement bars 3 at the top of the steel reinforcement cage, and then the sector-shaped steel plate 4 is fixedly connected through the U-shaped buckle A5. The sector-shaped steel plates 4 are spliced together in sequence, and then the sector-shaped steel plate 4 and the inner stirrup 2 are fixedly connected together using the U-shaped buckle A5. At the beginning, the semi-circular plate 6 is opened and hangs naturally. The conduit is inserted from the inner stirrup 2 for concrete pouring. After the concrete pouring is completed, the conduit is pulled out, and then the pulling rope 10 is pulled upwards until it cannot be pulled anymore. At this time, the semi-circular plate 6 turns to the horizontal state, and the two semi-circular plates 6 are joined together to block the space inside the inner stirrup 2. In this way, the concrete at the top of the pile is separated by the device of the present invention. When the pile head needs to be demolished later, there is no need to insert a steel drill to knock and separate the upper and lower concretes at the top of the pile. Only the circumferential cutting is carried out at the top of the pile position, and then the circumferential concrete outside the top of the pile and the concrete of the upper main reinforcement bars 3 are peeled off. Then, the concrete on the upper layer of the steel reinforcement cage can be lifted out by a crane. If the outer stirrup 1 is welded to the main reinforcement bar 3, when the device of the present invention is demolished, the U-shaped buckle A5 connecting the outer stirrup 1 and the sector-shaped steel plate 4 needs to be removed, and then the inner stirrup 2, the sector-shaped steel plate 4, the semi-circular plate 6, etc. are taken out. The outer stirrup 1 is not demolished and directly left on the steel reinforcement cage; if the outer stirrup 1 is fixed to the main reinforcement bar 3 by wire or fasteners, the outer stirrup 1 can also be demolished and reused.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; those of ordinary skill in the art should understand that they can still modify the technical solutions described in the above embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A concrete preset isolation device for the pile top critical interface, characterized in that: It includes an outer stirrup (1) and an inner stirrup (2). The outer stirrup (1) and the inner stirrup (2) are on the same horizontal plane. The inner diameter of the outer stirrup (1) is equal to the outer diameter of the steel reinforcement cage. The outer stirrup (1) is sleeved and fixed outside the main reinforcement bars (3) at the top of the steel reinforcement cage pile. The inner stirrup (2) is located at the middle position inside the steel reinforcement cage, and the inner diameter of the inner stirrup (2) is larger than the diameter of the conduit. There are several sector-shaped steel plates (4) between the outer stirrup (1) and the inner stirrup (2). The several sector-shaped steel plates (4) form a ring. Bolt holes are provided on both the outer arc edge and the inner arc edge of the sector-shaped steel plate (4). The outer arc edge and the inner arc edge of the sector-shaped steel plate (4) are respectively fixedly connected to the outer stirrup (1) and the inner stirrup (2) through U-shaped fasteners A (5). The bolts of the U-shaped fasteners A (5) pass through the bolt holes. There are two semi-circular plates (6) inside the inner stirrup (2). The two semi-circular plates (6) form a circle. The middle of the outer arc edge of the semi-circular plate (6) is fixedly connected to a U-shaped fastener B (7). A stop bar (8) is fixedly connected to the open end of the U-shaped fastener B (7). The stop bar (8) is located below the semi-circular plate (6), and the stop bar (8) is parallel to the straight edge of the semi-circular plate (6). The closed end of the U-shaped fastener B (7) is located in the gap between the inner stirrup (2) and the sector-shaped steel plate (4), and the closed end of the U-shaped fastener B (7) is clamped on the inner stirrup (2). The closed end of the U-shaped fastener B (7) can rotate around the inner stirrup (2). Small holes (9) are provided on the straight edge of the semi-circular plate (6). A pull rope (10) is fixed in the small holes (9). The upper end of the pull rope (10) is fixed to a cross bar (11). The cross bar (11) is placed on the upper surface of the steel casing (12).

2. The concrete preset isolation device for the pile top adjacent interface according to claim 1, characterized in that: The outer stirrup (1) is fixed to the main reinforcement bars (3) at the top of the steel reinforcement cage pile by welding or tying with iron wire.

3. The concrete preset isolation device for the pile top adjacent interface according to claim 1, wherein: The cross bar (11) is provided with a round hole (13), and the pull rope (10) passes through the round hole (13).

4. The concrete preset isolation device for the pile top adjacent interface according to claim 1, wherein: Two small holes (9) are symmetrically provided on the straight edge of the semi-circular plate (6).

5. The concrete preset isolation device for the pile top adjacent interface according to claim 1, wherein: The diameter of the small hole (9) is 3 mm.

6. The concrete preset isolation device for the pile top adjacent interface according to claim 1, characterized in that: The diameter of the inner stirrup (2) is 400 mm.

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