Pre-tensioning method tensioning beam-drawing pedestal

Abstract

The utility model belongs to the field of prestress tensioning, and particularly relates to a pre-tensioning method tensioning beam drawing pedestal which comprises a tensioning end and an anchoring end, the tensioning end comprises a bearing platform foundation, a reaction wall, a fixed cross beam, a jack and a movable cross beam, and the reaction wall, the fixed cross beam, the jack and the movable cross beam are sequentially arranged on the bearing platform foundation; one side of the fixed cross beam abuts against the face, opposite to the anchoring end, of the reaction wall, the jack is movably arranged between the fixed cross beam and the movable cross beam through a support, and one end of a steel bar can be anchored to the movable cross beam. The structure is simple, the design is reasonable, and the construction site can be saved; the jack can be detached and moved, and turnover use is facilitated; the jacks are used for reversely pushing the movable cross beam to stretch the reinforcing steel bars instead of a traditional center hole jack, and therefore the multiple reinforcing steel bars can be stretched more efficiently.

Description

Technical Field

[0001] The utility model belongs to the technical field of prestressed tensioning, and in particular relates to a pre-tensioning tensioning beam making pedestal. Background Art

[0002] When precast concrete π beams, cap beams, box beams, bridge decks and other prestressed structures are manufactured, it is necessary to apply prestress to the steel bars. Currently, the pre-tensioning method is mostly used. Pre-tensioning construction requires a dedicated site and tensioning structure. During tensioning, the two ends of the steel bar are fixed to the anchor end and the tensioning end respectively, and then prestress is applied through jacks, tensioning rods, etc. Among them, the tensioning end is a very important structure. The tensioning end is generally equipped with a reaction wall and a movable anchor vehicle, and the jack is fixedly installed on the reaction wall. However, this structure requires a larger test site, and the jack is fixedly installed, which is not convenient for the jack to be used in a turnover manner.

[0003] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a pre-tensioned beam-making pedestal.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A pre-tensioning beam pedestal includes a tensioning end and an anchoring end, wherein the tensioning end includes a pedestal foundation, and a reaction wall, a fixed beam, a jack and a movable beam sequentially arranged on the pedestal foundation; one side of the fixed beam rests against the side of the reaction wall facing away from the anchoring end, the jack is movably arranged between the fixed beam and the movable beam through a bracket, and one end of the steel bar can be anchored on the movable beam.

[0007] Furthermore, the pre-tensioned beam pedestal also includes a bracket placed on the pedestal foundation, all the jacks are installed on the bracket, and the jacks are placed on the pedestal foundation through the bracket.

[0008] Furthermore, the structure of the fixed crossbeam and the movable crossbeam is a steel box made of welded steel plates, and several steel plates are fixed in the vertical and horizontal directions inside the steel box as stiffening plates for reinforcement; a plurality of reserved holes are reserved on the movable crossbeam and the fixed crossbeam.

[0009] Furthermore, an anchor plate corresponding to the position of the jack is provided on the fixed beam or the movable beam.

[0010] Furthermore, a track foundation is fixed on the platform foundation, a beam track is provided on the track foundation, and the movable beam can move along the beam track.

[0011] Furthermore, an anti-overturning bracket is fixed to the side of the movable crossbeam facing away from the anchoring end.

[0012] Furthermore, at least two ear walls are fixed on the side of the reaction wall facing the anchoring end, the end faces of the ear walls are right triangles, and the upper edges of the ear walls are in the middle of the reaction wall; the size of the ear walls is 1 / 2 to 2 / 3 of the height of the reaction wall.

[0013] Furthermore, the reinforcement of the reaction wall extends into the cap foundation, and the reinforcement of the ear wall connects the reinforcement of the reaction wall and the cap foundation.

[0014] Furthermore, the reaction wall and the ear wall are an integrated structure, and its reinforcement includes N1 steel bars and N3 steel bars arranged in a rectangular shape to form the main shape of the reaction wall, N2 steel bars arranged obliquely to form the shape of the ear wall, and structural steel bars N5 steel bars and N6 steel bars. The N5 steel bars and N6 steel bars connect the N1 steel bars, N2 steel bars, and N3 steel bars into a whole.

[0015] Furthermore, two or four lifting ears are provided on the tops of the fixed crossbeam and the movable crossbeam.

[0016] The beneficial effects of the utility model are:

[0017] The utility model has a simple structure and a reasonable design, which can save construction space; the jack can be dismantled and moved, which is convenient for turnover; by using the jack to push the movable crossbeam back to tension the steel bars instead of using the traditional through-hole jack, multiple steel bars can be tensioned more efficiently;

[0018] The utility model has a reaction wall and ear wall with sophisticated design, so that the bearing capacity of the reaction wall can be reduced while meeting the use requirements, thereby reducing the amount of reinforcement and concrete used and reducing the cost of the reaction wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of this application are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention.

[0020] Figure 1 This is a schematic structural diagram of the tensioning end of an embodiment of the present utility model.

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the tensioning end of an embodiment of the present utility model.

[0022] Figure 3 This is a schematic diagram of the reinforcement structure of the reaction wall of an embodiment of the present utility model.

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the reaction wall reinforcement according to an embodiment of the present utility model.

[0024] In the figure: 1-reaction wall, 2-fixed beam, 3-anchor plate, 4-jack, 5-movable beam, 6-anti-overturning bracket, 7-track foundation, 8-pedestal foundation, 9-reserved hole, 10-bracket, 11-lifting ear. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 are within the scope of protection of the present invention.

[0026] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0028] like Figures 1 to 2 As shown, a pre-tensioning beam pedestal includes a tensioning end and an anchoring end, wherein the tensioning end includes a pedestal foundation 8, and a reaction wall 1, a fixed beam 2, a jack 4 and a movable beam 5 sequentially arranged on the pedestal foundation 8; one side of the fixed beam is against the side of the reaction wall 1 facing away from the anchoring end, and the jack 4 is movably arranged between the fixed beam and the movable beam 5 through a bracket 6, and one end of the steel bar can be anchored on the movable beam 5.

[0029] like Figure 1As shown, the pre-tensioning beam pedestal includes a bracket 10 placed on the base 8. All jacks 4 are mounted on the bracket 10. The jacks 4 are placed on the base 8 via the bracket 10. The bracket 10 is provided with a lifting lug 11. The bracket 10 is non-fixed, and the jacks 4 connected to the bracket 10 can be removed after tensioning is completed. In this embodiment, each set of tensioning beam pedestals is equipped with a movable crossbeam 5, a fixed crossbeam 2, and four 250t jacks 4. Two jacks 4 on the same side share a common bracket 10 for support.

[0030] like Figures 1 to 2 As shown, the structure of the fixed crossbeam 2 and the movable crossbeam 5 is a steel box made of welded steel plates. At the same time, several steel plates are fixed vertically and horizontally inside the steel box as stiffeners for reinforcement. The movable crossbeam 5 and the fixed crossbeam 2 are provided with reserved holes 9 for the fine-rolled threaded steel bars to pass through. Since the jack 4 directly presses on the fixed crossbeam 2 and the movable crossbeam 5, after long-term use, in order to prevent the jack 4 from causing deformation on the surface of the fixed crossbeam 2 or the movable crossbeam 5, preferably, the fixed crossbeam 2 or the movable crossbeam 5 is provided with an anchor plate 3 corresponding to the position of the jack 4. The anchor plate 3 is long and strip-shaped. The anchor plate 3 uses less material to achieve the surface reinforcement of the fixed crossbeam 2 or the movable crossbeam 5, strengthens the contact position with the jack 4, and makes the fixed crossbeam 2 and the movable crossbeam 5 firm and easy to use. The top of the fixed crossbeam and the movable crossbeam 5 is provided with two or four lifting ears 11 to facilitate the installation of the fixed crossbeam and the movable crossbeam 5.

[0031] like Figure 1 As shown, a track foundation 7 is fixed on the platform foundation 8, a beam track is provided on the track foundation 7, and a walking wheel is provided at the bottom of the movable beam 5, so that the movable beam 5 can move along the beam track; each movable beam 5 corresponds to at least 2 beam tracks; the beam track is pre-buried in the track foundation 7.

[0032] like Figure 1 As shown, an anti-overturning bracket 6 is welded and fixed on the side of the movable beam 5 facing away from the anchoring end. The anti-overturning bracket 6 is triangular and is arranged on both sides of the movable beam 5. The end of the anti-overturning bracket 6 away from the movable beam 5 is provided with a secondary wheel for walking along the beam track; the walking wheel and the secondary wheel are preferably both inverted wheels.

[0033] like Figures 1 to 4 As shown, at least two ear walls are fixed on the side of the reaction wall 1 facing the anchoring end, the end faces of the ear walls are right triangles, and the upper edges of the ear walls are in the middle of the reaction wall 1; the size of the ear walls is 1 / 2 to 2 / 3 of the height of the reaction wall 1.

[0034] like Figures 1 to 3 As shown, the reinforcement of the reaction wall 1 extends into the cap foundation 8, and the reinforcement of the ear wall connects the reinforcement of the reaction wall 1 and the cap foundation 8.

[0035] like Figures 3 and 4 As shown, the reaction wall 1 and the ear wall are an integrated structure, and its reinforcement includes N1 steel bars and N3 steel bars arranged in a rectangular shape to form the main shape of the reaction wall 1, N2 steel bars arranged obliquely to form the shape of the ear wall, and structural steel bars N5 steel bars and N6 steel bars; the angle of the N2 steel bar is consistent with the angle of the inclined surface of the ear wall, and the height is from the bottom of the pedestal foundation 8 to the top of the reaction wall 1; the N1 steel bar, N2 steel bar, and N3 steel bar resist the tensioning force transmitted by the fixed beam 2 during the tensioning process, and transmit the tensioning force to the pedestal foundation 8; the N5 steel bar and N6 steel bar connect the N1 steel bar, N2 steel bar, and N3 steel bar into a whole, and at the same time can prevent concrete cracking; the thickness of the steel protection layer of the reaction cavity and the ear wall is 10.6 mm.

[0036] When the utility model is used, the steel strand to be tensioned is connected to the finely rolled threaded steel bar, which is then passed through the fixed crossbeam 2 and the fixed crossbeam through the reserved hole 9. The position is then fixed by tightening the nut, which can prevent the steel strand from splashing and injuring people in the event of accidental tensioning. The utility model has a simple structure, and the jack 4 is easy to dismantle and move for turnover, which can also save construction space.

[0037] 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 are within the scope of protection of the pending claims of the present invention.

Claims

1. A pre-tensioned beam pedestal, comprising a tensioning end and an anchoring end, characterized in that: The tensioning end comprises a pedestal foundation (8), and a reaction wall (1), a fixed beam (2), a jack (4), and a movable beam (5) sequentially arranged on the pedestal foundation (8); one side of the fixed beam (2) rests against the side of the reaction wall (1) facing away from the anchoring end, the jack (4) is movably arranged between the fixed beam (2) and the movable beam (5) via a bracket (10), and one end of the steel bar can be anchored on the movable beam (5).

2. The pre-tensioning beam pedestal according to claim 1, characterized in that: The pre-tensioned beam pedestal further comprises a bracket (10) placed on the pedestal foundation (8), all the jacks (4) are mounted on the bracket (10), and the jacks (4) are placed on the pedestal foundation (8) through the bracket (10).

3. The pre-tensioning beam pedestal according to claim 1, characterized in that: The structure of the fixed crossbeam (2) and the movable crossbeam (5) is a steel plate box formed by welding steel plates, and a plurality of steel plates are fixed in the longitudinal and transverse directions inside the steel plate box as stiffening plates for reinforcement; a plurality of reserved holes (9) are reserved on the movable crossbeam (5) and the fixed crossbeam (2).

4. The pre-tensioning beam pedestal according to claim 1, characterized in that: An anchoring plate (3) corresponding to the position of the jack (4) is provided on the fixed crossbeam (2) or the movable crossbeam (5).

5. The pre-tensioning beam pedestal according to claim 1, characterized in that: A track foundation (7) is fixed on the platform foundation (8), a beam track is provided on the track foundation (7), and the movable beam (5) can move along the beam track.

6. The pre-tensioning beam pedestal according to claim 1, characterized in that: An anti-overturning bracket (6) is fixed to the side of the movable crossbeam (5) facing away from the anchoring end.

7. The pre-tensioning beam pedestal according to claim 1, characterized in that: At least two ear walls are fixed on the side of the reaction wall (1) facing the anchoring end, the end faces of the ear walls are right-angled triangles, and the upper edges of the ear walls are in the middle of the reaction wall (1); the size of the ear walls is 1 / 2 to 2 / 3 of the height of the reaction wall (1).

8. The pre-tensioning beam pedestal according to claim 7, characterized in that: The reinforcement of the reaction wall (1) extends into the cap foundation (8), and the reinforcement of the ear wall connects the reinforcement of the reaction wall (1) and the cap foundation (8).

9. The pre-tensioning beam pedestal according to claim 7, characterized in that: The reaction wall (1) and the ear wall are an integrated structure, and the reinforcement includes N1 steel bars and N3 steel bars arranged in a rectangular shape to form the main body of the reaction wall (1), N2 steel bars arranged obliquely to form the ear wall shape, and structural steel bars N5 steel bars and N6 steel bars. The N5 steel bars and N6 steel bars connect the N1 steel bars, N2 steel bars, and N3 steel bars into a whole.

10. The pre-tensioning beam pedestal according to claim 1, characterized in that: Two or four lifting ears (11) are provided on the tops of the fixed crossbeam (2) and the movable crossbeam (5).

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