Integral releasing and tensioning device for precast beam

Abstract

The utility model relates to a precast beam integral releasing and expanding device which comprises a steel beam side U-shaped cushion block and a movable U-shaped cushion block, and one end of the steel beam side U-shaped cushion block is connected with the movable U-shaped cushion block. And a hydraulic jack is connected in a groove of the steel beam side U-shaped cushion block. A positioning groove is formed in the end, facing the movable U-shaped cushion block, of the steel beam side U-shaped cushion block. The end, facing the steel beam side U-shaped cushion block, of the movable U-shaped cushion block is connected with a positioning strip, and the positioning strip is matched with the positioning groove. The back face of the movable U-shaped cushion block is connected with a lifting lug. The end, away from the movable U-shaped cushion block, of the steel beam side U-shaped cushion block is connected with a movable steel beam, and the end, away from the steel beam side U-shaped cushion block, of the movable U-shaped cushion block is connected with a pressing column. A plurality of prestressed tendons penetrate through the pressing columns and the movable steel beams. The utility model aims to overcome the defects in the prior art, and provides the integral releasing and tensioning device for the precast beam, which is high in control precision and convenient and quick to stretch and retract.

Description

Technical Field

[0001] The utility model relates to a prefabricated beam integral tensioning device. Background Art

[0002] At present, the commonly used release processes for prestressed steel bars are: jack overall release process and sand box release process. The sand box release process has the problems that the sand box itself is bulky and difficult to unload synchronously, and there are also problems such as slow sand release and sand filling, uneven release, and low degree of mechanical automation. The jack overall release process requires a special large-tonnage jack device or the jack is occupied for a long time during the tensioning and release period. In addition, since the jacks of each production line are occupied for a long time and cannot be quickly turned over, a large number of jacks need to be purchased, which is very expensive. Therefore, a precast beam overall release device is proposed to address the above problems. Utility Model Content

[0003] The utility model aims to overcome the existing defects and provide a prefabricated beam integral stretching device with high control accuracy and convenient and fast extension and retraction.

[0004] The technical solution to achieve the above purpose is: a prefabricated beam overall tensioning device, including a U-shaped pad on the steel beam side and a movable U-shaped pad, one end of the U-shaped pad on the steel beam side is connected to the movable U-shaped pad; a hydraulic jack is connected to the groove of the U-shaped pad on the steel beam side.

[0005] Preferably, a positioning groove is provided on one end of the U-shaped pad on the steel beam side facing the movable U-shaped pad; a positioning strip is connected to one end of the movable U-shaped pad facing the U-shaped pad on the steel beam side, and the positioning strip is matched with the positioning groove.

[0006] Preferably, a lifting lug is connected to the back side of the movable U-shaped pad.

[0007] Preferably, one end of the U-shaped pad on the steel beam side away from the movable U-shaped pad is connected to the movable steel beam, and one end of the movable U-shaped pad away from the U-shaped pad on the steel beam side is connected to the compression column; a plurality of prestressed tendons run through the compression column and the movable steel beam.

[0008] Preferably, the U-shaped pad on the steel beam side opens upward, and the movable U-shaped pad opens downward.

[0009] Preferably, a fixing buckle is provided in the joint surface between the U-shaped pad on the side of the steel beam and the movable U-shaped pad for fixing the movable U-shaped pad.

[0010] The beneficial effects of the utility model are as follows: the overall tensioning device for prefabricated beams is composed of a movable U-shaped pad embedded in a fixed U-shaped pad on the side of the steel beam to form a whole, which is placed between the movable steel beam and the compression column; during the load holding and anchoring stage of the prestressed tendon, a combination of a movable U-shaped pad and a fixed U-shaped pad on the side of the steel beam is used as a transition support to replace the sand box for load holding; during the tensioning stage, a hydraulic jack is used to replace the U-shaped pad assembly, and the telescopic function of the hydraulic jack is used to achieve overall tensioning, thereby giving full play to the advantages of the hydraulic jack that can synchronously control the telescopic extension, high control accuracy, convenient and fast telescopic extension, and a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall tensioning device for prefabricated beams of the utility model;

[0012] Figure 2 It is a disassembled schematic diagram of the overall prefabricated beam tensioning device of the utility model;

[0013] Figure 3 This is a schematic diagram of the installation and use of the prefabricated beam integral tensioning device of the utility model;

[0014] Figure 4 This is a detailed view of the connection position of the U-shaped pad on the side of the steel beam and the movable U-shaped pad of the utility model;

[0015] Figure 5 This is a connection detail diagram of the overall tensioning device for prefabricated beams of the utility model;

[0016] Figure 6 This is a detailed diagram of the connection between the hydraulic jack and the movable U-shaped pad of the utility model;

[0017] Figure 7 This is a schematic diagram of removing the movable U-shaped pad of the utility model;

[0018] Figure 8 It is a schematic diagram of the retraction of the hydraulic jack of the utility model.

[0019] In the figure: 1. U-shaped pad on the side of the steel beam; 2. Movable U-shaped pad; 3. Hydraulic jack; 4. Positioning groove; 5. Positioning bar; 6. Lifting lug; 7. Movable steel beam; 8. Compression column; 9. Prestressed tendons. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] The utility model will be further described below in conjunction with the accompanying drawings.

[0022] like Figure 1-8 As shown, a prefabricated beam overall tensioning device includes a U-shaped pad 1 on the steel beam side and a movable U-shaped pad 2, one end of the U-shaped pad 1 on the steel beam side is connected to the movable U-shaped pad 2; a hydraulic jack 3 is connected in the groove of the U-shaped pad 1 on the steel beam side. A positioning groove 4 is provided at one end of the U-shaped pad 1 on the steel beam side facing the movable U-shaped pad 2; a positioning bar 5 is connected to one end of the movable U-shaped pad 2 facing the U-shaped pad 1 on the steel beam side, and the positioning bar 5 is adapted to the positioning groove 4. A fixing buckle is provided in the joint surface between the U-shaped pad 1 on the steel beam side and the movable U-shaped pad 2, which is used to fix the movable U-shaped pad 2. The opening of the U-shaped pad 1 on the steel beam side is upward, and the opening of the movable U-shaped pad 2 is downward.

[0023] Specifically, the back of the movable U-shaped cushion block 2 is connected with a lifting lug 6, which is convenient for lifting the movable U-shaped cushion block 2.

[0024] like Figure 3 As shown, the end of the U-shaped pad 1 on the steel beam side away from the movable U-shaped pad 2 is connected to the movable steel beam 7, and the end of the movable U-shaped pad 2 away from the U-shaped pad 1 on the steel beam side is connected to the compression column 8; multiple prestressed tendons 9 pass through the compression column 8 and the movable steel beam 7.

[0025] like Figure 4 , 5 As shown in Figures 6, 7, and 8, the movable U-shaped pad 2 is embedded in the fixed U-shaped pad 1 on the steel beam side to form a whole, and placed between the movable steel beam 7 and the pressure column 8. During the tensioning and load-holding anchoring stage, the U-shaped pad assembly acts as a support to bear the load and meet the tensioning conditions. Before tensioning, the hydraulic jack 3 is placed in the U-shaped pad 1 on the steel beam side, and the hydraulic jacks 3 on both sides are started simultaneously to extend the oil inlet piston rod so that the hydraulic jack 3 bears all the supporting loads and creates a micro gap between the movable U-shaped pad 2 and the pressure column 8. The movable U-shaped pad 2 is removed upward, and the hydraulic jack 3 is controlled to slowly retract to perform overall tensioning until the tensioning is completed. After the tensioning is completed, the hydraulic jack 3 continues to retract until the stroke returns to zero, and the jack is taken out for circulation.

[0026] In the overall tensioning device for precast beams, a combination of a movable U-shaped pad 2 and a fixed U-shaped pad 1 on the side of the steel beam is used as a transition support in the prestressed tendon load holding and anchoring stage to replace the sand box for load holding. In the tensioning stage, a hydraulic jack 3 is used to replace the U-shaped pad assembly, and the telescopic function of the hydraulic jack 3 is used to achieve overall tensioning, thereby giving full play to the advantages of the hydraulic jack that can synchronously control the telescopic extension, high control accuracy, convenient and fast telescopic extension, and high degree of automation.

[0027] Specifically, the sand box tensioning process requires manual filling and releasing of sand to achieve length changes, with low precision. In addition, the shrinkage of the sand boxes on both sides of the steel beam during the tensioning process is manually controlled and cannot be kept consistent. Unsynchronized unloading can easily cause eccentric loading. The extension and retraction of the hydraulic jack 3 are controlled by the tensioning system, and the action is synchronized and the unloading is uniform and accurate, so safety and quality are guaranteed.

[0028] Specifically, the extension and retraction of the hydraulic jack 3 can be achieved by operating the hydraulic system, while the sand box process can only be operated manually, and the sand box itself is bulky, and the sand release and sand filling are slow. After using this device, the mechanization and automation level of the production process is improved, the manpower is reduced, the labor intensity of the workers is reduced, and the work efficiency is improved, which is conducive to saving labor costs, improving production efficiency, and generating economic benefits.

[0029] Specifically, during the load-holding and anchoring stage of the prestressed tendons, a combination of movable U-shaped pads and fixed U-shaped pads on the steel beam side are used as transition supports to achieve the load-holding function. At this stage, the jack can be taken out of the production line and used in other production lines. It has high flexibility and only one set of equipment is needed to complete the operations of multiple production lines. The investment cost is relatively low.

[0030] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A prefabricated beam integral tensioning device, characterized in that: It comprises a U-shaped pad (1) on the side of a steel beam and a movable U-shaped pad (2), wherein one end of the U-shaped pad (1) on the side of the steel beam is connected to the movable U-shaped pad (2); a hydraulic jack (3) is connected to the groove of the U-shaped pad (1) on the side of the steel beam; A positioning groove (4) is provided at one end of the U-shaped pad (1) on the steel beam side facing the movable U-shaped pad (2); a positioning strip (5) is connected to one end of the movable U-shaped pad (2) facing the U-shaped pad (1) on the steel beam side, and the positioning strip (5) is adapted to the positioning groove (4); One end of the steel beam side U-shaped pad (1) away from the movable U-shaped pad (2) is connected to the movable steel beam (7), and one end of the movable U-shaped pad (2) away from the steel beam side U-shaped pad (1) is connected to the compression column (8); a plurality of prestressed tendons (9) pass through the compression column (8) and the movable steel beam (7).

2. The prefabricated beam integral tensioning device according to claim 1, characterized in that: The back side of the movable U-shaped cushion block (2) is connected with a lifting lug (6).

3. The prefabricated beam integral tensioning device according to claim 1, characterized in that: The opening of the U-shaped pad (1) on the side of the steel beam faces upward, and the opening of the movable U-shaped pad (2) faces downward.

4. The prefabricated beam integral tensioning device according to claim 1, characterized in that: A fixing buckle is provided in the joint surface between the steel beam side U-shaped pad (1) and the movable U-shaped pad (2) for fixing the movable U-shaped pad (2).

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