Prefabrication Technology and Equipment for Small Box Girder of Ramp Bridge

Abstract

The present invention relates to the technical field of small beam box prefabrication, in particular to a process and equipment for prefabrication of small box beams of a ramp bridge, a base, an outer mold and a steel frame suspended on the inner side of the outer mold, the outer surface of the outer mold is fixedly connected with a plurality of equidistantly distributed vibration points, the vibration points include a tamping rod and a connecting tube slidably connected to the outer side of the tamping rod, the outer side of the connecting tube is fixedly connected to the inner side of the outer mold, one end of the connecting tube close to the inner side of the outer mold is flush with the inner surface of the outer mold, and the end of the tamping rod close to the inner side of the outer mold is also flush with the inner surface of the outer mold in an initial state, when the front end of the tamping rod moves toward the inner side of the outer mold, it can support the steel frame, four clamping rods can pull the steel frame and firmly clamp the intersection of the steel frame on the output end of the tamping rod, and when the tamping rod works, the vibration is directly transmitted through the steel frame. This tamping method can directly transmit the vibration generated by the vibrator to the steel frame running through the casting area, thereby increasing production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of small beam box prefabrication, in particular to a ramp bridge small box beam prefabrication process and equipment. Background Art

[0002] Prestressed concrete small beam boxes have the characteristics of high structural rigidity and convenient construction. They are currently widely used in the construction of large highway bridges. Since the small beam box is a special-shaped component, the densely distributed steel bars in the beam body and the prestressed corrugated pipes passing through it will increase the resistance to the flow of concrete. The inclined surface inside the beam box is also not conducive to the discharge of bubbles inside the concrete during the vibration process. Once the material distribution and vibration process is unreasonable, it will easily lead to bubbles, honeycombs, water marks, color differences on the surface of the precast concrete beam box, as well as "rotten edges" and "rotten roots" on the beam ends. Common quality problems such as these will seriously affect its appearance and durability;

[0003] like Figure 1 As shown, in the process of prefabrication of the small beam box, an outer mold 1 and an inner mold (the inner mold is not shown) are required. Between the outer mold 1, the inner mold and the base 4 is a steel frame 2, 3 is a prestressed corrugated pipe, the steel frame 2 is pre-tied on the steel frame tying stand 5, and then hoisted into the inner side of the outer mold 1 by a crane. The steel frame 2 runs through the entire beam box casting area, and the transverse steel bars and vertical steel bars of the steel frame 2 are crossed, as shown in FIG. Figure 8 .

[0004] In the prior art, vibration is often achieved by an attached vibrator, which is attached to the outside of the outer mold. Since the attached vibrator is not in direct contact with the concrete, tamping is achieved by the transmission of vibration, resulting in poor tamping effect, short vibration transmission distance, and incomplete and uneven tamping.

[0005] The present invention optimizes the beam box prefabrication process and equipment, can directly transmit the vibration generated by the vibrator to the steel skeleton 2 running through the casting area, and can ensure the flatness of the outer surface of the beam box, thereby greatly increasing the tamping efficiency and increasing production efficiency.

[0006] Therefore, in order to solve the above problems, a prefabrication process and equipment for small box girders of ramp bridges are proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a prefabrication process and equipment for a small box girder of a ramp bridge. By optimizing the prefabrication process and equipment for the beam box, the vibration generated by the vibrator can be directly transmitted to the steel skeleton running through the casting area, and the smoothness of the outer surface of the beam box can be ensured, thereby greatly increasing the tamping efficiency and increasing production efficiency.

[0008] To achieve the above object, the present invention provides the following technical solution: a ramp bridge small box girder prefabrication device, comprising a base, an outer mold and a steel frame suspended inside the outer mold, wherein the outer surface of the outer mold is fixedly connected with a plurality of equally spaced vibration points;

[0009] The vibration point includes a tamping rod and a connecting tube slidably connected to the outer side of the tamping rod, the outer side of the connecting tube is fixedly connected to the inner side of the outer mold, one end of the connecting tube close to the inner side of the outer mold is flush with the inner surface of the outer mold, and the end of the tamping rod close to the inner side of the outer mold is also flush with the inner surface of the outer mold in the initial state. When the front end of the tamping rod moves toward the inner side of the outer mold, it can support the steel bar skeleton;

[0010] The inner side of the connecting tube is provided with four slide grooves, and the inner side of each slide groove is slidably connected with a pull rod, and the front end of the pull rod is flush with the surface of the connecting tube in the initial state, and the four pull rods correspond to the four steel bar positions at the intersection of the steel bar skeleton respectively, and the pull rod can move toward the inner side of the outer mold, and a cavity is provided on the inner side of the outer mold, and a clamping rod is rotatably connected to the cavity, and when the pull rod moves toward the inner side of the outer mold, the clamping rod can slide over the steel bar skeleton;

[0011] The tail end of the clamping rod is fixedly connected to the inner side of one end of the cavity with a second pull rope. When the pull rod moves toward the outside of the outer mold, under the limitation of the second pull rope, the four clamping rods can hold the steel skeleton and firmly clamp the intersection of the steel skeleton on the output end of the tamping rod. When the tamping rod works, the vibration is directly transmitted through the steel skeleton to achieve tamping.

[0012] Under the above setting, the present invention has multiple equidistantly distributed vibration points fixedly connected to the outer surface of the outer mold, and the vibration points are provided with clamping rods and tamping rods. During tamping, the four clamping rods can pull the steel skeleton and firmly clamp the intersection of the steel skeleton on the output end of the tamping rod. When the tamping rod works, the vibration is directly transmitted through the steel skeleton to achieve tamping. This tamping method can directly transmit the vibration generated by the vibrator to the steel skeleton that runs through the casting area, and can ensure the flatness of the outer surface of the beam box, thereby greatly increasing the tamping efficiency and increasing the production efficiency.

[0013] After the present invention is used, the pull rod, the tamping rod and the connecting tube can be flush with the inner side of the outer mold, so that after the tamping is completed, the flatness of the outer side of the prefabricated small beam box is guaranteed;

[0014] The present invention performs strong front and rear limit on the intersection of the steel skeleton, and then first transmits the vibration force of the tamping rod to the intersection of the steel skeleton, so that the vibration force can be distributed vertically and horizontally along the steel skeleton, which plays a role in increasing the tamping efficiency and effect.

[0015] As a preferred embodiment of the prefabricating equipment for small box girders of ramp bridges of the present invention, a limiting groove is provided at the front end of the tamping rod. When the tamping rod moves toward the inside of the outer mold, one of the steel bars at the intersection of the steel skeleton can be embedded in the limiting groove to increase the contact area with the steel skeleton and play a limiting role.

[0016] As a preferred prefabricated equipment for small box girders of ramp bridges of the present invention, a central axis is fixedly connected to the inner side of the cavity, the central axis is located in the rotation center of the clamping rod, and a spring is fixedly connected between the outer side of the central axis and the inner side of the rotation center of the clamping rod. The spring can make one end of the clamping rod tilt outward from the cavity. After the clamping rod slides over the steel frame, the clamping rod is reset again under the action of the spring, which can play the role of a "barb".

[0017] As a preferred prefabricating device for small box girders of ramp bridges of the present invention, the inner side of the tamping rod is rotatably connected to an eccentric block, the side of the tamping rod away from the outer mold is fixedly connected to a motor, the output end of the motor is fixedly connected to the eccentric block, and the rotation of the eccentric block driven by the motor provides a vibration source.

[0018] As a preferred embodiment of the prefabrication equipment for small box girders of ramp bridges of the present invention, the vibration point also includes a hydraulic rod, the movable end of the hydraulic rod is fixedly connected to a connecting rod, the other end of the connecting rod is fixedly connected to a pressure plate, the end of the pressure plate close to the inner side of the outer mold is fixedly connected to a rubber connecting block, the other end of the rubber connecting block is fixedly connected to a motor, and the forward and backward movement of the tamping rod is achieved by the extension and retraction of the hydraulic rod.

[0019] As a preferred prefabricating device for small box girders of ramp bridges of the present invention, a slip ring is slidably connected to the outer side of the tamping rod, one end of the slip ring is fixedly connected to a sliding rod, and the sliding rod can move toward the inner side of the outer mold to resist the pull rod and make the pull rod move toward the inner side of the outer mold.

[0020] As a preferred prefabricated equipment for small box girders of ramp bridges of the present invention, the axes of the sliding rod and the pulling rod are collinear, the diameter of the sliding rod is smaller than the diameter of the pulling rod, a damping spring rod is arranged on the outer side of the sliding rod, and the two ends of the damping spring rod are respectively fixedly connected to the inner side of one end of the sliding groove and the tail end of the pulling rod, and after the clamping rod slides over the steel frame, the damping spring rod can drive the pulling rod to move slowly backward, so that the clamping rod clamps the steel frame.

[0021] As a preferred prefabricated equipment for small box girders of ramp bridges of the present invention, the front end of the sliding rod is fixedly connected to a first pull rope, and a groove can be opened at the front end of the sliding rod for retaining the loosened first pull rope, the first pull rope slides over the inner side of the pull rod and is fixedly connected to the clamping rod, the connection point between the first pull rope and the clamping rod and the connection point between the second pull rope and the clamping rod are respectively arranged on both sides of the rotation center line of the clamping rod, when the sliding rod moves backward, the second pull rope can be pulled to retract the clamping rod into the cavity, and the clamping rod can be reset and pulled backward to the initial position.

[0022] As a preferred embodiment of the small box girder prefabrication equipment for the ramp bridge of the present invention, the vibration point also includes an electric push rod, the movable end of the electric push rod is fixedly connected to a connecting frame, the other end of the connecting frame is fixedly connected to a slip ring, and the forward or backward movement of the slide rod is achieved by the extension and retraction of the electric push rod.

[0023] The specific working principle of the present invention is that during the concrete pouring stage, the base bears the main weight of the beam box. First, the hydraulic rod at the tamping point is controlled to contract so that the tamping rod presses against the intersection of the steel frame skeleton. Then, the movable end of the electric push rod contracts, and the movable end of the electric push rod drives the sliding rod to move inwardly to the outer mold through the connecting frame and the slip ring. The sliding rod then presses against the pull rod, and the pull rod moves forward. When the cavity slides out of the connecting tube, the clamping rod in the cavity will tilt outward under the action of the spring. As the pull rod continues to move forward, the clamping rod will tilt inward and slide over the steel frame after contacting the steel frame. When it is completely slid After passing the steel frame, the clamping rod is reset again under the action of the clockwork, which can play the role of "barb". At this time, the movable end of the electric push rod is stretched, the sliding rod and the pull rod are separated, the first pull rope is in a loose state and is not subjected to force. Under the action of the damping spring rod, the damping spring rod acts on the pull rod, and the pull rod slowly moves to the outside of the outer mold. The clamping rod will be stuck on the steel frame. At this time, the movable end of the electric push rod is stretched again, and the sliding rod pulls the pull rod to move to the outside of the outer mold through the first pull rope. At this time, the intersection of the steel frame will be limited by the clamping rod and the tamping rod, and the tamping rod works to realize the transmission of vibration force.

[0024] After the tamping is completed, the movable end of the electric push rod drives the sliding rod to move inside the outer mold through the connecting frame and the slip ring, and the sliding rod then supports the pull rod, and the pull rod moves forward to make the clamping rod move away from the steel frame. At this time, there is enough space for the clamping rod to rotate inward into the cavity. At this time, the movable end of the electric push rod is stretched again. As the first pull rope is pulled outward, because the damping spring rod has a slow reset effect, it can be understood that the damping spring rod applies a resistance to the pull rod in the opposite direction of the pulling direction of the first pull rope. At this time, the clamping rod will be embedded in the cavity, and as the first pull rope is continuously pulled, the initial position will be reset. After the reset is completed, the pull rod, tamping rod and connecting tube can be flush with the inner side of the outer mold, thereby ensuring the flatness of the outside of the prefabricated small beam box after the tamping is completed.

[0025] The prefabrication process of small box beam of ramp bridge includes the following steps:

[0026] Step 1: When making the steel skeleton, the size and inclination of the prefabricated steel bar binding stand are consistent with the outer mold. When binding the steel skeleton on the steel bar binding stand, the intersection of the steel skeleton is arranged at the position of the corresponding tampering point of the outer mold by marking in advance;

[0027] Step 2: When vibrating the concrete, the four clamping rods at the tamping point hold the steel skeleton and firmly clamp the intersection of the steel skeleton on the output end of the tamping rod. The tamping rod works to transmit the vibration directly through the steel skeleton to achieve tamping.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The ramp bridge small box girder prefabrication equipment of the present invention has a plurality of equidistantly distributed vibration points fixedly connected to the outer surface of the outer mold, and clamping rods and tamping rods are arranged on the vibration points. During tamping, the four clamping rods can hold the steel skeleton and firmly clamp the intersection of the steel skeleton on the output end of the tamping rod. When the tamping rod works, the vibration is directly transmitted through the steel skeleton to achieve tamping. This tamping method can directly transmit the vibration generated by the vibrator to the steel skeleton running through the casting area, and can ensure the flatness of the outer surface of the beam box, thereby greatly increasing the tamping efficiency and increasing the production efficiency.

[0030] 2. The ramp bridge small box girder prefabrication equipment of the present invention can ensure that the pull rod, tamping rod and connecting tube are flush with the inner side of the outer mold after the tamping is completed, thereby ensuring the flatness of the outer side of the prefabricated small beam box.

[0031] 3. The prefabricated equipment for small box girders of the ramp bridge of the present invention performs strong front and rear limiting on the intersection of the steel skeleton, and then first transmits the vibrating force of the tamping rod to the intersection of the steel skeleton, so that the vibrating force can be distributed vertically and horizontally along the steel skeleton, which plays a role in increasing the tamping efficiency and effect.

[0032] 4. The small box girder prefabrication equipment for the ramp bridge, in the concrete pouring stage, the base bears the main weight of the beam box. First, the hydraulic rod at the tamping point is controlled to contract so that the tamping rod can support the intersection of the steel frame. Then, the movable end of the electric push rod contracts, and the movable end of the electric push rod drives the slide rod to move inwardly to the outer mold through the connecting frame and the slip ring. The slide rod then supports the pull rod, and the pull rod moves forward. When the cavity slides out of the connecting tube, the clamping rod in the cavity will tilt outward under the action of the spring. As the pull rod continues to move forward, the clamping rod will tilt inward and slide over the steel frame after contacting the steel frame. When it is completely After sliding over the steel frame, the clamping rod is reset again under the action of the spring, which can play the role of a "barb". At this time, the movable end of the electric push rod is stretched, the sliding rod and the pull rod are separated, and the first pull rope is in a loose state and is not subjected to force. Under the action of the damping spring rod, the damping spring rod acts on the pull rod, and the pull rod slowly moves toward the outside of the outer mold. The clamping rod will be stuck on the steel frame. At this time, the movable end of the electric push rod is stretched again, and the sliding rod pulls the pull rod to move to the outside of the outer mold through the first pull rope. At this time, the intersection of the steel frame will be limited by the clamping rod and the tamping rod, and the tamping rod works to realize the transmission of vibration force.

[0033] 5. For the prefabrication equipment of the small box girder of the ramp bridge, after the tamping is completed, the movable end of the electric push rod drives the sliding rod to move to the inside of the outer mold through the connecting frame and the slip ring, and the sliding rod then supports the pull rod, and the pull rod moves forward to make the clamping rod away from the steel frame. At this time, there is enough space for the clamping rod to rotate inward into the cavity. At this time, the movable end of the electric push rod is stretched again. As the first pull rope is pulled outward, because the resetting effect of the damping spring rod is slow, it can be understood that the damping spring rod applies a resistance to the pull rod in the opposite direction of the traction direction of the first pull rope. At this time, the clamping rod will be embedded in the cavity, and as the first pull rope is continuously pulled, the initial position will be reset. After the reset is completed, the pull rod, tamping rod and connecting tube can be flush with the inner side of the outer mold, thereby ensuring the flatness of the outside of the prefabricated small beam box after the tamping is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of the external formwork during the prefabrication and pouring of the existing beam box;

[0035] Figure 2 This is a schematic diagram of the appearance structure of the existing beam box prefabricated steel bar binding stand;

[0036] Figure 3 This is a schematic diagram of the installation structure of the vibration point on the outer mold in the present invention;

[0037] Figure 4 It is a schematic diagram of the overall cross-sectional installation structure of the vibration point in the present invention;

[0038] Figure 5 For the present invention Figure 4 Schematic diagram of the installation structure at A in FIG.

[0039] Figure 6 It is a schematic diagram of the internal structure of the pull rod of the present invention;

[0040] Figure 7 This is a schematic diagram of the position structure of the connecting tube before the vibration point of the present invention works;

[0041] Figure 8 It is a schematic diagram of the position structure of the tamping rod at the vibration point of the present invention moving forward;

[0042] Figure 9 This is a schematic diagram of the position structure of the vibration point pull rod moving forward in the present invention;

[0043] Figure 10 For the present invention Figure 6 Schematic diagram of the installation structure at A in FIG.

[0044] Figure 11 This is a schematic diagram of the positions of the pull rods when the vibration point of the present invention is working.

[0045] In the figure: 1. External formwork; 2. Steel bar skeleton; 3. Prestressed corrugated pipe; 4. Base; 5. Steel bar binding stand; 6. Vibration point;

[0046] 61. Hydraulic rod; 62. Connecting rod; 63. Pressure plate; 64. Rubber connecting block; 65. Connecting frame; 66. Electric push rod; 67. Tamping rod; 68. Pull rod; 69. Motor; 610. Slip ring; 611. Slide rod; 612. Damping spring rod; 613. First pull rope; 614. Eccentric block; 615. Cavity; 616. Second pull rope; 617. Clamping rod; 618. Central axis; 619. Spring; 620. Connecting tube; 621. Limiting groove; 622. Slide groove. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0048] Example 1, please refer to Figures 1-11 , the present invention provides a technical solution:

[0049] A ramp bridge small box girder prefabrication process and equipment, a ramp bridge small box girder prefabrication equipment, comprising a base 4, an outer mold 1 and a steel frame 2 suspended inside the outer mold 1, wherein the outer surface of the outer mold 1 is fixedly connected with a plurality of equally spaced vibration points 6;

[0050] The vibration point 6 includes a tamping rod 67 and a connecting tube 620 slidably connected to the outer side of the tamping rod 67. The outer side of the connecting tube 620 is fixedly connected to the inner side of the outer mold 1. The end of the connecting tube 620 close to the inner side of the outer mold 1 is flush with the inner surface of the outer mold 1. The end of the tamping rod 67 close to the inner side of the outer mold 1 is also flush with the inner surface of the outer mold 1 in the initial state. When the front end of the tamping rod 67 moves toward the inner side of the outer mold 1, it can support the steel skeleton 2.

[0051] Four slide grooves 622 are provided on the inner side of the connecting tube 620, and a pull rod 68 is slidably connected to the inner side of each slide groove 622. The front end of the pull rod 68 is flush with the surface of the connecting tube 620 in the initial state. The four pull rods 68 correspond to the four steel bar positions at the intersection of the steel bar skeleton 2 respectively. The pull rod 68 can move toward the inner side of the outer mold 1. A cavity 615 is provided on the inner side of the outer mold 1. A clamping rod 617 is rotatably connected to the cavity 615. When the pull rod 68 moves toward the inner side of the outer mold 1, the clamping rod 617 can slide over the steel bar skeleton 2.

[0052] At the end of the clamping rod 617, a second pull rope 616 is fixedly connected to the inner side of one end of the cavity 615. When the pull rod 68 moves outward in the direction of the outer side of the outer mold 1, under the limitation of the second pull rope 616, the four clamping rods 617 can hold the steel bar framework 2 and firmly clamp the intersection point of the steel bar framework 2 on the output end of the vibrating rod 67. When the vibrating rod 67 works, the vibration is directly transmitted through the steel bar framework 2 to achieve vibration compaction.

[0053] Under the above settings, a plurality of vibration points 6 are fixedly connected to the outer surface of the outer mold 1 of the present invention at equal intervals. The clamping rod 617 and the vibrating rod 67 are arranged on the vibration point 6. During vibration compaction, the four clamping rods 617 can hold the steel bar framework 2 and firmly clamp the intersection point of the steel bar framework 2 on the output end of the vibrating rod 67. When the vibrating rod 67 works, the vibration is directly transmitted through the steel bar framework 2 to achieve vibration compaction. This vibration compaction method can directly transmit the vibration generated by the vibrator to the steel bar framework penetrating the pouring area, and can ensure the flatness of the outer surface of the beam box, thereby greatly increasing the vibration compaction efficiency and production efficiency.

[0054] After the present invention is used, the pull rod 68, the vibrating rod 67 and the connecting cylinder 620 can all be flush with the inner side of the outer mold 1, so as to ensure the flatness of the outer side of the precast small beam box after vibration compaction.

[0055] The present invention strongly limits the front and back of the intersection of the steel bar framework 2, and then transmits the vibration force of the vibrating rod to the intersection of the steel bar framework 2 first, which can make the vibration force distribute longitudinally and horizontally along the steel bar framework 2, playing a role in increasing the vibration compaction efficiency and effect.

[0056] Specifically, a limiting groove 621 is opened at the front end of the vibrating rod 67. When the vibrating rod 67 moves inward in the direction of the inner side of the outer mold 1, one of the steel bars at the intersection point of the steel bar framework 2 can be embedded in the limiting groove 621, which is used to increase the contact area with the steel bar framework 2 and play a role in limiting.

[0057] Specifically, a central shaft 618 is fixedly connected to the inner side of the cavity 615. The central shaft 618 is located within the rotation center of the clamping rod 617. A hairspring 619 is fixedly connected between the outer side of the central shaft 618 and the inner side of the rotation center of the clamping rod 617. The hairspring 619 can make one end of the clamping rod 617 tilt outward out of the cavity 615. After the clamping rod 617 slides over the steel bar framework 2, the clamping rod 617 is reset again under the action of the hairspring 619, which can play the role of a "barb".

[0058] Specifically, an eccentric block 614 is rotatably connected to the inner side of the vibrating rod 67. A motor 69 is fixedly connected to the side of the vibrating rod 67 away from the outer mold 1. The output end of the motor 69 is fixedly connected to the eccentric block 614, and the rotation of the eccentric block 614 driven by the motor 69 provides a vibration source.

[0059] Specifically, the vibration point 6 also includes a hydraulic rod 61, the movable end of the hydraulic rod 61 is fixedly connected to a connecting rod 62, the other end of the connecting rod 62 is fixedly connected to a pressure plate 63, the end of the pressure plate 63 close to the inner side of the outer mold 1 is fixedly connected to a rubber connecting block 64, the other end of the rubber connecting block 64 is fixedly connected to a motor 69, and the forward and backward movement of the tamping rod 67 is achieved by the extension and retraction of the hydraulic rod 61.

[0060] Specifically, a slip ring 610 is slidably connected to the outer side of the tamping rod 67 , and a slide rod 611 is fixedly connected to one end of the slip ring 610 . The slide rod 611 can move toward the inner side of the outer mold 1 to resist the pull rod 68 and make the pull rod 68 move toward the inner side of the outer mold 1 .

[0061] Specifically, the axes of the sliding rod 611 and the pulling rod 68 are collinear, the diameter of the sliding rod 611 is smaller than the diameter of the pulling rod 68, a damping spring rod 612 is arranged on the outer side of the sliding rod 611, and the two ends of the damping spring rod 612 are respectively fixedly connected to the inner side of one end of the sliding groove 622 and the tail end of the pulling rod 68. After the clamping rod 617 slides over the steel frame 2, the damping spring rod 612 can drive the pulling rod 68 to move slowly backward, so that the clamping rod 617 clamps the steel frame 2.

[0062] Specifically, the front end of the sliding rod 611 is fixedly connected with a first pull rope 613, and a groove can be opened at the front end of the sliding rod 611 to retain the loosened first pull rope 613. The first pull rope 613 slides over the inner side of the pull rod 68 and is fixedly connected with the clamping rod 617. The connection point between the first pull rope 613 and the clamping rod 617 and the connection point between the second pull rope 616 and the clamping rod 617 are respectively arranged on both sides of the rotation center line of the clamping rod 617. When the sliding rod 611 moves backward, it can pull the second pull rope 616 to retract the clamping rod 617 into the cavity 615, and reset the clamping rod 617 and pull it backward to the initial position.

[0063] Specifically, the vibration point 6 also includes an electric push rod 66 , a movable end of the electric push rod 66 is fixedly connected to a connecting frame 65 , and the other end of the connecting frame 65 is fixedly connected to a slip ring 610 , and the forward or backward movement of the slide rod 611 is achieved by the extension and retraction of the electric push rod 66 .

[0064] The specific working principle of the present invention is that during the concrete pouring stage, the base 4 bears the main weight of the beam box, firstly controls the hydraulic rod 61 at the tamping point 6 to contract, so that the tamping rod 67 bears the intersection of the steel frame 2 (see Figure 8 ), then, the movable end of the electric push rod 66 contracts, and the movable end of the electric push rod 66 drives the slide rod 611 to move toward the inner side of the outer mold 1 through the connecting frame 65 and the slip ring 610, and the slide rod 611 then supports the pull rod 68, and the pull rod 68 moves forward. When the cavity 615 slides out of the connecting tube 620, the clamping rod 617 in the cavity 615 will tilt outward under the action of the clockwork 619 (see Figure 11As the pull rod 68 continues to move forward, the clamping rod 617 contacts the steel frame 2 and then slides inwardly through the steel frame 2. After completely sliding through the steel frame 2, the clamping rod 617 is reset again under the action of the spring 619, which can play the role of a "barb" (see Figure 11 At this time, the movable end of the electric push rod 66 is stretched, the slide rod 611 and the pull rod 68 are separated, the first pull rope 613 is in a loose state and is not subjected to force. Under the action of the damping spring rod 612, the damping spring rod 612 acts on the pull rod 68, and the pull rod 68 slowly moves to the outside of the outer mold 1, and the clamping rod 617 is clamped on the steel frame 2 (see Figure 11 In S3), at this time, the movable end of the electric push rod 66 is extended again, and the slide rod 611 pulls the pull rod 68 to move to the outside of the outer mold 1 through the first pull rope 613. At this time, the intersection of the steel skeleton 2 is limited by the clamping rod 617 and the tamping rod 67, and the tamping rod 67 works to realize the transmission of vibration force;

[0065] After the tamping is completed, the movable end of the electric push rod 66 drives the slide rod 611 to move toward the inner side of the outer mold 1 through the connecting frame 65 and the slip ring 610. The slide rod 611 then supports the pull rod 68, and the pull rod 68 moves forward, so that the clamping rod 617 is away from the steel frame 2 (see Figure 11 S4 in the figure), at this time, the clamping rod 617 has enough space to rotate inwardly into the cavity 615. At this time, the movable end of the electric push rod 66 is stretched again. As the first pull rope 613 is pulled outward, because the damping spring rod 612 has a slow reset effect, it can be understood that the damping spring rod 612 applies a resistance to the pull rod 68 in the opposite direction to the pulling direction of the first pull rope 613. At this time, the clamping rod 617 will be embedded in the cavity 615 (see Figure 11 In S5), with the continuous pulling of the first pull rope 613, the initial position is reset. After the reset, the pull rod 68, the tamping rod 67 and the connecting tube 620 can be flush with the inner side of the outer mold 1, so as to ensure the flatness of the outer side of the prefabricated small beam box after the tamping is completed.

[0066] The present invention also discloses a ramp bridge small box girder prefabrication process, the steps of which are:

[0067] Step 1: When the steel skeleton 2 is made, the prefabricated steel bar binding stand 5 is consistent in size and inclination with the outer mold 1. When the steel skeleton 2 is bound on the steel bar binding stand 5, the intersection of the steel skeleton 2 is arranged at the position of the corresponding tampering point 6 of the outer mold 1 by marking in advance;

[0068] Step 2: When the concrete is poured and vibrated, the four clamping rods 617 at the tamping point 6 hold the steel skeleton 2 and firmly clamp the intersection of the steel skeleton 2 on the output end of the tamping rod 67. When the tamping rod 67 works, the vibration is directly transmitted through the steel skeleton 2 to achieve tamping.

[0069] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Prefabrication equipment for small box girders of ramp bridges, comprising a base (4), an external mold (1) and a steel reinforcement cage (2) suspended inside the external mold (1), characterized in that: The outer surface of the outer mold (1) is fixedly connected with a plurality of equally spaced vibration points (6); The vibration point (6) comprises a tamping rod (67) and a connecting tube (620) slidably connected to the outer side of the tamping rod (67); the outer side of the connecting tube (620) is fixedly connected to the inner side of the outer mold (1); one end of the connecting tube (620) close to the inner side of the outer mold (1) is flush with the inner surface of the outer mold (1); and one end of the tamping rod (67) close to the inner side of the outer mold (1) is also flush with the inner surface of the outer mold (1) in the initial state; when the front end of the tamping rod (67) moves toward the inner side of the outer mold (1), it can support the steel frame (2); The inner side of the connecting tube (620) is provided with four sliding grooves (622), and the inner side of each sliding groove (622) is slidably connected with a pull rod (68). The front end of the pull rod (68) in the initial state is flush with the surface of the connecting tube (620). The four pull rods (68) respectively correspond to the four steel bar positions at the intersection of the steel bar skeleton (2). The pull rod (68) can move toward the inner side of the outer mold (1). The inner side of the outer mold (1) is provided with a cavity (615), and a clamping rod (617) is rotatably connected to the cavity (615). When the pull rod (68) moves toward the inner side of the outer mold (1), the clamping rod (617) can slide over the steel bar skeleton (2); The tail end of the clamping rod (617) is fixedly connected to the inner side of one end of the cavity (615) with a second pull rope (616). When the pull rod (68) moves toward the outer side of the outer mold (1), under the limitation of the second pull rope (616), the four clamping rods (617) can hold the steel skeleton (2) and firmly clamp the intersection of the steel skeleton (2) on the output end of the tamping rod (67). When the tamping rod (67) works, the vibration is directly transmitted through the steel skeleton (2) to achieve tamping.

2. The precast equipment for small box girders of ramp bridges according to claim 1, characterized in that: A limiting groove (621) is provided at the front end of the tamping rod (67). When the tamping rod (67) moves toward the inner side of the outer mold (1), one of the steel bars at the intersection of the steel bar skeleton (2) can be embedded in the limiting groove (621) to increase the contact area with the steel bar skeleton (2) and to play a limiting role.

3. The precast equipment for small box girders of ramp bridges according to claim 1, characterized in that: A central axis (618) is fixedly connected to the inner side of the cavity (615), and the central axis (618) is located within the rotation center of the clamping rod (617). A spring (619) is fixedly connected between the outer side of the central axis (618) and the inner side of the rotation center of the clamping rod (617). The spring (619) can cause one end of the clamping rod (617) to tilt outward from the cavity (615). After the clamping rod (617) slides over the steel frame (2), the clamping rod (617) is reset again under the action of the spring (619), thereby playing the role of a "barb".

4. The prefabrication equipment for small box girders of ramp bridges according to claim 1, wherein: The inner side of the tamping rod (67) is rotatably connected to an eccentric block (614), and the side of the tamping rod (67) away from the outer mold (1) is fixedly connected to a motor (69). The output end of the motor (69) is fixedly connected to the eccentric block (614), and the rotation of the eccentric block (614) driven by the motor (69) provides a vibration source.

5. The precast equipment for small box girders of ramp bridges according to any one of claims 1 to 4, characterized in that: The tamping point (6) further comprises a hydraulic rod (61), the movable end of the hydraulic rod (61) being fixedly connected to a connecting rod (62), the other end of the connecting rod (62) being fixedly connected to a pressure plate (63), one end of the pressure plate (63) close to the inner side of the outer mold (1) being fixedly connected to a rubber connecting block (64), the other end of the rubber connecting block (64) being fixedly connected to a motor (69), and the forward and backward movement of the tamping rod (67) is achieved by the extension and retraction of the hydraulic rod (61).

6. The prefabrication equipment for small box girders of ramp bridges according to claim 5, characterized in that: The outer side of the tamping rod (67) is slidably connected to a slip ring (610), and one end of the slip ring (610) is fixedly connected to a slide rod (611). The slide rod (611) can move toward the inner side of the outer mold (1) to resist the pull rod (68) and make the pull rod (68) move toward the inner side of the outer mold (1).

7. The prefabrication equipment for small box girders of ramp bridges according to claim 6, characterized in that: The axes of the sliding rod (611) and the pulling rod (68) are collinear, the diameter of the sliding rod (611) is smaller than the diameter of the pulling rod (68), a damping spring rod (612) is arranged on the outer side of the sliding rod (611), and the two ends of the damping spring rod (612) are respectively fixedly connected to the inner side of one end of the sliding groove (622) and the tail end of the pulling rod (68), after the clamping rod (617) slides over the steel frame (2), the damping spring rod (612) can drive the pulling rod (68) to move slowly backward, so that the clamping rod (617) clamps the steel frame (2).

8. The precast equipment for small box girders of ramp bridges according to claim 7, characterized in that: The front end of the sliding rod (611) is fixedly connected with a first pull rope (613), and the first pull rope (613) slides over the inner side of the pull rod (68) and is fixedly connected with the clamping rod (617). The connection point between the first pull rope (613) and the clamping rod (617) and the connection point between the second pull rope (616) and the clamping rod (617) are respectively arranged on both sides of the rotation center line of the clamping rod (617). When the sliding rod (611) moves backward, it can pull the second pull rope (616) to retract the clamping rod (617) into the cavity (615), and reset the clamping rod (617) and pull it backward to the initial position.

9. The prefabrication equipment for small box girders of ramp bridges according to claim 8, characterized in that: The vibration point (6) also includes an electric push rod (66), the movable end of the electric push rod (66) is fixedly connected to a connecting frame (65), and the other end of the connecting frame (65) is fixedly connected to a slip ring (610), and the forward or backward movement of the slide rod (611) is achieved by the extension and retraction of the electric push rod (66).

10. The precast process of the small box girder of the ramp bridge is characterized in that, The steps of using the ramp bridge small box girder prefabrication equipment as claimed in claim 9 are as follows: Step 1: When the steel bar skeleton (2) is manufactured, the size and inclination of the prefabricated steel bar binding stand (5) are consistent with those of the outer mold (1). When the steel bar skeleton (2) is bound on the steel bar binding stand (5), the intersection of the steel bar skeleton (2) is arranged at the position of the corresponding tampering point (6) of the outer mold (1) by marking in advance; Step 2: When the concrete is poured and vibrated, the four clamping rods (617) at the tamping point (6) hold the steel frame (2) and firmly clamp the intersection of the steel frame (2) on the output end of the tamping rod (67). The tamping rod (67) works to transmit the vibration directly through the steel frame (2) to achieve tamping.

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