A cantilever beam construction structure with early formwork removal based on prestressed tensioning groove

Abstract

The present invention provides a cantilever beam construction structure with early demolding based on prestressed tensioning grooves, including stress-bearing steel bars, prestressed bars and first tied stress-bearing steel bars embedded in the cantilever beam, one end of the stress-bearing steel bars is embedded in the wall to form a fixed connection, and the other end penetrates the cantilever beam to provide support for the cantilever beam; a tensioning groove is preset on the upper surface of the end of the cantilever beam away from the wall, one end of the prestressed bars and the first tied stress-bearing steel bars are embedded in the wall, and the other end extends into the tensioning groove, and after the tensioning is completed, the first tied stress-bearing steel bars are buried in the mud with the pouring of the tensioning groove. The present invention strengthens the support received by the cantilever beam by adding stress-bearing steel bars inside the cantilever beam, so that after the prestressed tensioning is completed, the cantilever beam can be removed from the casting template without waiting for the concrete to completely solidify, thereby shortening the construction time; by adding tensioning grooves, the tensioning end is moved to the cantilever beam surface, which can reduce the tensioning support equipment set up at the cantilever beam end.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a cantilever beam construction structure based on prestressed tensioning grooves and capable of early demolding. Background Art

[0002] Traditionally, post-tensioning method is often used for prestressing in the construction of cantilever beams. The tensioning end is often designed at the beam end. After the cantilever beam is cast, it is necessary to wait until the strength of the cantilever beam reaches the set requirements before tensioning, grouting, and anchoring the cantilever beam through the tensioning end. Then, the casting formwork of the cantilever beam can be removed only after the slurry is completely solidified. This method will cause a large backlog of turnover materials in large spaces. More importantly, if the casting formwork of the cantilever beam is to be removed, a lot of time will be consumed to wait for the cantilever beam to completely solidify. At the same time, a lot of time will also be consumed to build the support system required for the tensioning equipment at the tensioning end, which will easily lead to excessive construction time and increase labor and economic costs. Summary of the invention

[0003] In view of this, in order to shorten the time for dismantling the cantilever beam casting formwork and reduce the support system built at the tensioning end, an embodiment of the present invention provides a cantilever beam construction structure with early formwork removal based on prestressed tensioning grooves.

[0004] An embodiment of the present invention provides a cantilever beam construction structure with early formwork removal based on prestressed tensioning grooves, comprising:

[0005] A tensioning groove is preset at one end of the cantilever beam away from the wall surface, and a prestressed tendon is pre-buried between the tensioning groove and the wall surface, and the prestressed tendon passes through the cantilever beam and is buried in the wall surface;

[0006] A stress-bearing steel bar arranged below the prestressed tendons, one end of which is embedded in the wall surface and the other end of which passes through the cantilever beam;

[0007] A first tied stress-bearing steel bar disposed above the prestressed tendons, one end of which is embedded in the wall surface, and the other end of which passes through the cantilever beam and extends into the tensioning groove;

[0008] The prestressed tensioning effect of the prestressed tendons and the supporting effect of the stressed steel bars and the first tied stressed steel bars shorten the demoulding time of the casting formwork of the cantilever beam.

[0009] Furthermore, a tensioning tube is pre-buried between the tensioning groove and the wall surface, one end of the tensioning tube is in contact with the wall surface, and the other end extends into the tensioning groove, and the prestressed tendons are inserted into the tensioning tube.

[0010] Furthermore, the prestressed tendons are prestressed by external equipment, and the external equipment is accommodated in the tensioning groove.

[0011] Furthermore, the prestressed tendons may be embedded in an arc shape or a straight line shape.

[0012] Furthermore, one end of the first binding stress-bearing steel bar located in the tensioning groove is also connected to the second binding stress-bearing steel bar, and the two can be welded or wire-bound.

[0013] Furthermore, the tensioning groove is located on the center line of the upper end surface of the cantilever beam.

[0014] Furthermore, the prestressed tendons are located on the transverse centerline plane of the cantilever beam.

[0015] Furthermore, the external device is a tensioning jack.

[0016] The technical solution provided by the embodiments of the present invention has the following beneficial effects: a cantilever beam construction structure based on prestressed tensioning grooves of the present invention can be early demolded, by adding stress-bearing steel bars inside the cantilever beam to enhance the support received by the cantilever beam, so that after the prestressing is completed, the cantilever beam casting formwork can be removed without waiting for the concrete to completely solidify, thereby shortening the demolding time and saving costs; by adding tensioning grooves, the tensioning end is moved to the cantilever beam surface, which can reduce the tensioning support system set up at the cantilever beam end; the prestress generated by the prestressed tendons enhances the bearing capacity and bending resistance of the cantilever beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a top view structural schematic diagram of a cantilever beam construction structure based on prestressed tensioning grooves and capable of early demolding of the present invention;

[0018] Figure 2 yes Figure 1 Sectional view of the AA plane;

[0019] In the figure: 1-cantilever beam, 2-stressed steel bars, 3-tensioning grooves, 4-second tied stress-bearing steel bars, 5-prestressed tendons, 6-tensioning tubes, 7-first tied stress-bearing steel bars, 8-wall. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0021] Please refer to Figure 1 and Figure 2 The present invention discloses a cantilever beam construction structure with early demolding based on prestressed tensioning grooves, which mainly relates to the technical field of civil construction, and includes: a cantilever beam 1, stressed steel bars 2 and prestressed bars 5.

[0022] The cantilever beam 1 is cast on the wall 8 through a template and extends transversely relative to the wall 8. After the cantilever beam 1 is formed, one end thereof is fixedly connected to the wall 8 and the other end is suspended.

[0023] The stressed steel bars 2 are pre-buried in the lower end of the cantilever beam 1, one end of the stressed steel bars 2 is buried in the wall 8 to form a fixed connection, and the other end passes through the cantilever beam 1. The stressed steel bars 2 are buried in the beam as the cantilever beam 1 is cast, thereby providing support for the cantilever beam 1 and enhancing its strength. In this embodiment, the number of the stressed steel bars 2 can be flexibly selected according to specific application conditions and is not limited by this embodiment.

[0024] When the cantilever beam 1 is constructed with a casting formwork, a tensioning groove 3 is provided on the upper surface of one end thereof away from the wall 8. The tensioning groove 3 is not cast during the initial casting of the cantilever beam 1. The tensioning groove 3 is arranged on the center line of the upper surface of the cantilever beam 1. The tensioning groove 3 is located above the stressed steel bar 2. The prestressed tendons 5 are embedded between the tensioning groove 3 and the wall 8. One end of the prestressed tendons 5 is embedded in the wall 8 and the other end extends into the tensioning groove 3. The prestressed tendons 5 can be embedded in an arc shape or a straight line shape. The prestressed tendons 5 are located on the transverse centerline plane of the cantilever beam 1 and are used for prestressing, so as to enhance the bearing capacity and bending resistance of the cantilever beam 1. The prestressed tendons 5 are prestressed by external equipment. In this embodiment, the prestressed tendons 5 are pre-buried in an arc shape and the arc surface faces downward after pre-buried. The external equipment is a tensioning jack. When the prestressed tendons 5 are tensioned, the external equipment is accommodated in the tensioning groove 3. In this way, the support system required for building prestressing can be reduced, thereby shortening the construction time.

[0025] A tensioning tube 6 is also pre-buried between the tensioning groove 3 and the wall surface 8. One end of the tensioning tube 6 is in contact with the wall surface 8 and the other end extends into the tensioning groove 3. The prestressed tendons 5 are passed through the tensioning tube 6. After the tensioning of the prestressed tendons 5 is completed, the tensioning tube 6 and the prestressed tendons 5 are grouted and anchored. In this way, the bearing capacity and bending resistance of the cantilever beam can be enhanced by the prestress generated by the prestressed tendons 5.

[0026] A first binding stress-bearing steel bar 7 is also pre-buried inside the cantilever beam 1. The first binding stress-bearing steel bar 7 is arranged above the tensioning tube 6. One end of the first binding stress-bearing steel bar 7 is buried in the wall surface 8 to form a fixed connection, and the other end extends into the tensioning groove 3. The first binding stress-bearing steel bar 7 is buried in the beam as the cantilever beam 1 is initially cast. One end of the first binding stress-bearing steel bar 7 located in the tensioning groove 3 is connected with a second binding stress-bearing steel bar 4, and the two can be welded or wired. The other end of the second binding stress-bearing steel bar 4 extends to the end of the cantilever beam 1 away from the wall. The second binding stress-bearing steel bar 4 needs to be tied to the prestressed tendons 5. The connection is made after the pulling is completed, so as to avoid affecting the accommodation of the external equipment; then the tensioning groove 3 is poured to complete the overall pouring of the cantilever beam 1, and the first tied stress-bearing steel bars 7 and the second tied stress-bearing steel bars 4 are used to provide support for the cantilever beam 1, so that the support provided by the stress-bearing steel bars 2 and the prestressed steel bars 5 can be combined to shorten the removal time of the casting formwork of the cantilever beam 1, thereby shortening the overall construction time and saving costs; in this embodiment, the number of the first tied stress-bearing steel bars 7 and the second tied stress-bearing steel bars 4 can be flexibly selected according to the specific application conditions and is not limited by this embodiment.

[0027] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0028] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0029] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cantilever beam construction structure with early formwork removal based on prestressed tensioning grooves, characterized in that: include: A tensioning groove is preset at one end of the cantilever beam away from the wall surface, and a prestressed tendon is pre-buried between the tensioning groove and the wall surface, and the prestressed tendon passes through the cantilever beam and is buried in the wall surface; A stress-bearing steel bar arranged below the prestressed tendons, one end of which is embedded in the wall surface and the other end of which passes through the cantilever beam; A first tied stress-bearing steel bar disposed above the prestressed tendons, one end of which is embedded in the wall surface, and the other end of which passes through the cantilever beam and extends into the tensioning groove; The prestressed tensioning effect of the prestressed tendons and the supporting effect of the stressed steel bars and the first tied stressed steel bars shorten the demoulding time of the casting formwork of the cantilever beam; A tensioning tube is also pre-buried between the tensioning groove and the wall surface, one end of the tensioning tube is in contact with the wall surface, and the other end extends into the tensioning groove, and the prestressed tendons are inserted into the tensioning tube; The prestressed tendons can be embedded in an arc shape or a straight line shape.

2. The cantilever beam construction structure with early demolding based on prestressed tensioning groove as claimed in claim 1, characterized in that: The prestressed tendons are prestressed by external equipment, and the external equipment is accommodated in the tensioning groove.

3. The cantilever beam construction structure based on prestressed tensioning grooves and capable of early demolding as claimed in claim 1, characterized in that: One end of the first binding stress-bearing steel bar located in the tensioning groove is also connected to the second binding stress-bearing steel bar, and the two can be welded or wire-bound.

4. The cantilever beam construction structure with early demolding based on prestressed tensioning grooves as claimed in claim 1, characterized in that: The tensioning groove is located on the center line of the upper end surface of the cantilever beam.

5. The cantilever beam construction structure based on prestressed tensioning grooves and capable of early demolding as claimed in claim 1, characterized in that: The prestressed tendons are located on the transverse centerline plane of the cantilever beam.

6. The cantilever beam construction structure based on prestressed tensioning grooves and capable of early demolding as claimed in claim 2, characterized in that: The external device is a tensioning jack.

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