Unbonded pre-stressed anchor cable tensioning notch clamping and shaping mold

Abstract

The utility model provides an unbonded pre-stressed anchor cable tensioning notch clamping and shaping die, and belongs to the technical field of bridge pre-stressed tensioning. The unbonded pre-stressed anchor cable tensioning notch clamping shaping mold comprises a steel casing, an anchor backing plate and a spiral bar, the anchor backing plate is fixedly arranged at the bottom end of the steel casing, an inner hole is formed in the anchor backing plate, one end of the spiral bar is fixedly connected to the lower surface of the anchor backing plate, and the other end of the spiral bar is fixedly connected to the bottom end of the steel casing. And the steel casing is used for positioning the jack when the jack is placed. The pre-positioning device has the advantages of being simple in structure, accelerating pre-positioning of the jack, guaranteeing that a tensioning notch does not deform, and improving construction safety and efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge prestressing tensioning, in particular to a non-bonded prestressed anchor cable tensioning notch clamping and shaping die. Background Art

[0002] In the design and construction of highways, bridge projects are inevitable, and cross-line overpasses mostly use rotating cast-in-place beams. The widespread application of unbonded prestressed anchor cables in the field of vertical prestressing has also led to increasingly prominent problems. For example, during the concrete pouring process, the anchor box deforms, causing the notch to deform, requiring secondary excavation. At the same time, the anchor box is not high enough, and during the concrete pouring process, concrete often mistakenly enters the notch and adheres to the pressure nut. During the subsequent cleaning process, the pressure nut is easily damaged, which affects subsequent construction and reduces construction efficiency. Whether the bridge can proceed with subsequent processes depends mainly on the progress of vertical tensioning, among which the vertical tensioning notch is the main factor affecting the tensioning progress. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a non-bonded prestressed anchor cable tensioning notch clamping and shaping mold.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A non-bonded prestressed anchor cable tensioning slot positioning and shaping mold comprises a steel casing, an anchor plate and a spiral reinforcement. The anchor plate is fixedly arranged at the bottom end of the steel casing, an inner hole is arranged on the anchor plate, one end of the spiral reinforcement is fixedly connected to the lower surface of the anchor plate, and the steel casing is used to position the jack when placing the jack.

[0006] Furthermore, a plurality of clamping blocks are equidistantly arranged on the top circumference of the steel casing, and the top end of the clamping block can swing inward and outward on the steel casing with its bottom end, and the clamping block has a first state and a second state in the swinging stroke of the top end from outside to inside, and the inner side surface of the clamping block is located outside the cavity of the steel casing in the first state, and the inner side surface of the clamping block is in a state with the top end tilted inward in the second state, and the clamping block is used to hold the protruding end of the jack and guide it during the extension process of the protruding end of the jack.

[0007] Furthermore, the steel casing is provided with a through groove for the clamping block to follow the displacement of the extended end of the jack along the axial direction of the steel casing, the clamping block is installed in the through groove, and two support rods are fixedly provided on the inner bottom wall of the through groove. The clamping block is provided with a rod hole, and the support rod is passed through the rod hole. The inner diameter of the bottom end opening of the rod hole is adapted to the outer diameter of the support rod, and the width of the cavity of the rod hole in the radial direction of the steel casing is set to gradually increase from bottom to top.

[0008] Further, when the clamping block is in the first state, the support rod contacts the inner wall surface of the rod hole, and when the clamping block is in the second state, the support rod contacts the outer wall surface of the rod hole.

[0009] Furthermore, a ring is provided on the outer side of the steel casing, and the inner diameter of the ring is matched with the outer diameter of the steel casing. When the clamp is in the first state, the top of the outer side surface of the clamp is inclined and extends outward to the outside of the steel casing, and the ring drives the clamp to switch from the first state to the second state by moving to the outside of the clamp.

[0010] Furthermore, an inverted "L"-shaped slide groove is provided on the outer side surface of the clamping block, a slide rod is provided on the inner surface of the collar, and the bottom end of the axial section of the slide rod slide groove is an entrance.

[0011] Furthermore, a strip groove for sliding of the slide rod is provided on the surface of the steel casing, and the slide rod slides downward in the strip groove to enable the collar to be separated from the clamping block.

[0012] The utility model has the following beneficial effects:

[0013] The non-bonded prestressed anchor cable tensioning slot positioning and shaping mold provided in the present application can ensure that the anchor cable tensioning slot does not deform, thereby ensuring the safety of tensioning construction. At the same time, the device is simple to manufacture, speeds up the positioning speed of the jack, improves construction efficiency, and can speed up construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the first embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of the second embodiment of the utility model;

[0016] Figure 3 It is a cross-sectional view of the clamping block in the second embodiment of the utility model;

[0017] Figure 4 It is a schematic diagram of the sleeve ring in the second embodiment of the present utility model.

[0018] In the figure: 1. steel casing; 2. anchor plate; 3. spiral rib; 4. clamping block; 5. through groove; 6. support rod; 7. rod hole; 8. collar; 9. slide groove; 10. slide rod; 11. strip groove. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, Example 1 of the present application provides a non-bonded prestressed anchor cable tensioning groove positioning and shaping mold, including a steel casing 1, an anchor plate 2 and a spiral reinforcement 3. The anchor plate 2 is fixedly arranged at the bottom end of the steel casing 1, and an inner hole is arranged on the anchor plate 2. One end of the spiral reinforcement 3 is fixedly connected to the lower surface of the anchor plate 2. The steel casing 1 is used to position the jack when placing the jack.

[0021] By setting the steel casing 1, the jack is placed, the pre-positioning speed of the jack is increased, the construction progress is accelerated, and the construction efficiency is improved. At the same time, during the process of the jack tensioning the anchor cable, the steel casing 1 has a guiding and limiting effect on the jack, which can better prevent the tensioning notch from deforming. The spiral reinforcement 3 has the function of increasing the local compressive strength of the concrete.

[0022] like Figures 2 to 4 As shown, in the second embodiment of the present application, a plurality of clamping blocks 4 are equidistantly arranged on the top circumference of the steel casing 1, and the top end of the clamping block 4 can swing inward and outward on the steel casing 1 with its bottom end, and the clamping block 4 has a first state and a second state in the stroke of its top end swinging from outside to inside. When the clamping block 4 is in the first state, the inner side surface of the clamping block 4 is located outside the cavity of the steel casing 1, and when the clamping block 4 is in the second state, the inner side surface of the clamping block 4 is in a state where the top end is inclined inward, and the clamping block 4 is used to hold the protruding end of the jack and guide it during the extension process of the protruding end of the jack.

[0023] Specifically, the inner diameter of the steel casing 1 is prefabricated to be slightly larger than the outer diameter of the jack, so that the placement and removal of the jack is more convenient when the clamp block 4 is in the first state. At the same time, the clamp block 4 is provided, and during the ejection process of the extended end of the jack, the clamp block 4 guides the extended end of the jack by holding the extended end of the jack and following the displacement of the extended end of the jack on the steel casing 1, which can better stabilize the jack and protect the tensioning notch from damage.

[0024] Among them, a through groove 5 is opened on the steel casing 1 for the clamping block 4 to follow the displacement of the extended end of the jack along the axial direction of the steel casing 1. The clamping block 4 is installed in the through groove 5. Two support rods 6 are fixedly provided on the inner bottom wall of the through groove 5. A rod hole 7 is provided on the clamping block 4, and the support rod 6 is passed through the rod hole 7. The inner diameter of the bottom end of the rod hole 7 is adapted to the outer diameter of the support rod 6. The width of the cavity of the rod hole 7 in the radial direction of the steel casing 1 is set to gradually increase from bottom to top.

[0025] The clamp block 4 can swing inward and outward with the bottom opening of the rod hole 7 and the connection between the support rod 6 as the center, so as to switch the clamp block 4 between the first state and the second state. In the process of placing or removing the jack, it is only necessary to keep the clamp block 4 in the first state. After the jack is placed, it is only necessary to keep the clamp block 4 in the second state. At this time, the extended end of the jack automatically enters between the multiple clamp blocks 4 during the extension process, and is held and guided by the clamp blocks 4.

[0026] When the clamp block 4 is in the first state, the support rod 6 contacts the inner wall surface of the rod hole 7, and when the clamp block 4 is in the second state, the support rod 6 contacts the outer wall surface of the rod hole 7. By setting it in this way, when the clamp block 4 is in the first state, the support rod 6 cooperates with the inner wall surface of the rod hole 7, so that the clamp block 4 can be kept in the first state more stably.

[0027] A collar 8 is sleeved on the outer side of the steel casing 1, and the inner diameter of the collar 8 matches the outer diameter of the steel casing 1. When the clamp 4 is in the first state, the top of its outer side surface extends outwardly at an angle to the outside of the steel casing 1, and the collar 8 drives the clamp 4 to switch from the first state to the second state by moving to the outer side of the clamp 4.

[0028] Specifically, in the initial state, the collar 8 is located below the clamping block 4 outside the steel casing 1, and at this time, the collar 8 is separated from the clamping block 4. After the jack is put in, the collar 8 is directly moved upward, and when the collar 8 is put on the clamping block 4, the collar 8 switches the clamping block 4 from the first state to the second state, and when the clamping block 4 moves following the extension end of the jack, the collar 8 keeps the clamping block 4 in the second state.

[0029] More specifically, an inverted “L”-shaped slide groove 9 is provided on the outer side of the clamping block 4 , a slide rod 10 is provided on the inner surface of the collar 8 , and the bottom end of the axial section of the slide groove 9 of the slide rod 10 is an entrance.

[0030] After the jack is placed on the steel casing 1, the collar 8 is moved upward so that the slide rod 10 enters the axial section of the slide groove 9. Then, when the collar 8 moves upward to the highest position, the collar 8 is rotated so that the slide rod 10 enters the circumferential section of the slide groove 9. At this time, the collar 8 is fixed to the clamping block 4 in the axial direction of the steel casing 1 by utilizing the cooperation between the slide rod 10 and the slide groove 9. Then, in the process that the clamping block 4 holds the protruding end of the jack and moves with the protruding end of the jack, the collar 8 moves synchronously with the clamping block 4, and in this process, the collar 8 keeps the clamping block 4 always in the second state.

[0031] The surface of the steel casing 1 is provided with a strip groove 11 for the sliding rod 10 to slide, and the sliding rod 10 slides downward in the strip groove 11 to make the collar 8 separate from the clamping block 4. Specifically, in the axial direction of the steel casing 1, the strip groove 11 is always aligned with the bottom entrance of the slide groove 9, and when the collar 8 is located at the lower end of the clamping block 4, the sliding rod 10 is located in the strip groove 11, and then, the sliding rod 10 can be kept aligned with the bottom entrance of the slide groove 9, which makes it easier for the collar 8 to be put on the clamping block 4.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A non-bonded prestressed anchor cable tensioning slot clamping and shaping mold, characterized in that: The invention comprises a steel casing (1), an anchor plate (2) and a spiral rib (3); the anchor plate (2) is fixedly arranged at the bottom end of the steel casing (1); an inner hole is arranged on the anchor plate (2); one end of the spiral rib (3) is fixedly connected to the lower surface of the anchor plate (2); and the steel casing (1) is used to position the jack when placing the jack.

2. The non-bonded prestressed anchor cable tensioning notch clamping and shaping mold according to claim 1, characterized in that: A plurality of clamping blocks (4) are equidistantly arranged on the circumference of the top end of the steel casing (1); the top end of the clamping block (4) can swing inward and outward on the steel casing (1) with its bottom end; the clamping block (4) has a first state and a second state in the swinging stroke of its top end from outside to inside; in the first state, the inner side surface of the clamping block (4) is located outside the cavity of the steel casing (1); in the second state, the inner side surface of the clamping block (4) is in a state where the top end is tilted inward; the clamping block (4) is used to hold the protruding end of the jack tightly and guide it during the protruding end of the jack.

3. The non-bonded prestressed anchor cable tensioning notch clamping and shaping mold according to claim 2, characterized in that: The steel casing (1) is provided with a through groove (5) for the clamping block (4) to follow the displacement of the extended end of the jack along the axial direction of the steel casing (1). The clamping block (4) is installed in the through groove (5). Two support rods (6) are fixedly arranged on the inner bottom wall of the through groove (5). The clamping block (4) is provided with a rod hole (7), and the support rod (6) is inserted into the rod hole (7). The inner diameter of the bottom end of the rod hole (7) is adapted to the outer diameter of the support rod (6). The width of the cavity of the rod hole (7) in the radial direction of the steel casing (1) is arranged to gradually increase from bottom to top.

4. The non-bonded prestressed anchor cable tensioning notch clamping and shaping mold according to claim 3, characterized in that: When the clamp block (4) is in the first state, the support rod (6) contacts the inner wall surface of the rod hole (7); when the clamp block (4) is in the second state, the support rod (6) contacts the outer wall surface of the rod hole (7).

5. The non-bonded prestressed anchor cable tensioning notch clamping and shaping mold according to claim 3, characterized in that: The outer side of the steel casing (1) is provided with a collar (8), the inner diameter of the collar (8) being matched with the outer diameter of the steel casing (1); when the clamping block (4) is in the first state, the top of the outer side surface thereof is inclined to extend outward to the outside of the steel casing (1); and the collar (8) drives the clamping block (4) to switch from the first state to the second state by moving to the outside of the clamping block (4).

6. The non-bonded prestressed anchor cable tensioning notch clamping and shaping mold according to claim 5, characterized in that: The outer side surface of the clamping block (4) is provided with an inverted "L"-shaped sliding groove (9), and the inner surface of the collar (8) is provided with a sliding rod (10), and the bottom end of the axial section of the sliding groove (9) of the sliding rod (10) is an entrance.

7. The non-bonded prestressed anchor cable tensioning notch clamping and shaping mold according to claim 6, characterized in that: The surface of the steel casing (1) is provided with a strip groove (11) for the sliding rod (10) to slide, and the sliding rod (10) slides downward in the strip groove (11) so that the collar (8) is separated from the clamping block (4).

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