In-vitro consolidation positioning device for cantilever cast-in-place beam closure construction

Abstract

The utility model discloses an external consolidation positioning device for cantilever cast-in-place beam closure construction, which is characterized in that the closure direction of a cantilever cast-in-place beam is defined as the Y direction, the horizontal and vertical direction of the cantilever cast-in-place beam is defined as the X direction, the height direction of the cantilever cast-in-place beam is defined as the Z direction, one end of the device is fixed and extends out of a poured section cantilever beam in the Y direction, and the other end of the device is used for fixedly hoisting a cast-in-place section cantilever beam; the device comprises an embedded bolt, an I-shaped steel beam and a connecting assembly, the embedded bolts are welded and fixed on reinforcing steel bars in the cast-in-place cantilever beam and the cast-in-place cantilever beam at the two ends of the closure construction area, and the embedded bolts are used for fixing and mounting the connecting assemblies; the I-shaped steel beams are arranged in parallel at intervals, and the two ends and the tail ends of the I-shaped steel beams are fixedly clamped and connected through the connecting assemblies. According to the device, the cast-in-place section steel bars are positioned with the cast-in-place section as the reference, the dead weights of concrete and the cast-in-place section steel bars are overcome by hoisting and positioning the cast-in-place section steel bars through the I-shaped steel beams, elastic deformation of the cast-in-place section steel bars is avoided, and the device is convenient to disassemble and transfer and reusable.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, specifically to an external consolidation and positioning device for the closure construction of cantilever cast-in-place beams. Background Technology

[0002] During the closure construction of existing cantilever cast-in-place beams, it is necessary to connect the pre-cast and in-place sections. This requires high positioning accuracy between the two. Although surveying and positioning are carried out before construction, the steel reinforcement has a certain elastic deformation, especially after concrete pouring. The bending stress on the steel reinforcement due to the weight of the concrete and its own weight often results in the positioning height of the in-place section being lower than that of the pre-cast section, and there is also a large amount of residual stress within the steel reinforcement of the in-place section. This will lead to cracking of the concrete at the closure point after the bridge is closed, and even local stress concentration, shortening the service life of the bridge.

[0003] Therefore, how to design a positioning device that uses the cast-in-place section as a reference to position the reinforcing bars of the cast-in-place section, and overcome the self-weight of the concrete and reinforcing bars of the cast-in-place section, and avoid elastic deformation of the reinforcing bars of the cast-in-place section, has become a technical problem that urgently needs to be solved by those in the field. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this utility model is to provide an external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam. This device uses the already cast section as a reference to position the reinforcing bars of the cast-in-place section, and uses an I-beam to hoist and position the reinforcing bars of the cast-in-place section to overcome the self-weight of the concrete and the reinforcing bars of the cast-in-place section, avoid elastic deformation of the reinforcing bars of the cast-in-place section, and facilitate disassembly, transportation, and reuse.

[0005] To address the aforementioned problems, this utility model provides an external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam. The closure direction of the cantilever cast-in-place beam is defined as the Y-axis, its horizontal and vertical directions as the X-axis, and its height direction as the Z-axis. One end of the device is fixed and extends outwards in the Y-axis from the already cast cantilever beam, while the other end is fixed to the suspended cast-in-place cantilever beam. The device includes: embedded bolts, I-beams, and connecting components. The embedded bolts are welded and fixed to the reinforcing bars within the already cast cantilever beam and the cast-in-place cantilever beam at both ends of the closure construction area. The embedded bolts are used to fix and hang the connecting components. Multiple I-beams are provided and arranged in parallel at intervals. Both ends and the middle section of the I-beams are clamped and connected by the connecting components.

[0006] Preferably, the connecting assembly includes stress connection plates covering the top and bottom surfaces of the I-beam, wherein the stress connection plates located at both ends of the I-beam and connected to the cast-in-place cantilever beam and the precast cantilever beam are Z-directly penetrated and fixed to the pre-embedded bolts with nuts; the stress connection plates located in the middle section of the I-beam are Z-directly penetrated and connected to the opposite sides with tie rods with nuts.

[0007] Preferably, the thickness of the stress connection plate located in the middle section of the I-beam is less than the thickness of the stress connection plates located at both ends of the I-beam, wherein the stress connection plates located in the middle section of the I-beam are all connected with tie rods through in the Z direction.

[0008] Preferably, the thickness of the stress connection plate located in the middle section of the I-beam is equal to the thickness of the stress connection plates located at both ends of the I-beam. Stress connection plates are pressed onto both the top and bottom surfaces of the middle section of the I-beam. The stress connection plate located on the top surface of the middle section of the I-beam has a Z-direction penetrating connection for the tie rod, and the bottom end of the tie bolt is welded to the stress connection plate located on the bottom surface of the middle section of the I-beam.

[0009] The advantages of this utility model compared with the prior art are as follows:

[0010] This invention discloses an external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam. An H-beam extending in the Y-direction connects the reinforcing bars of the cast-in-place and pre-cast sections. The cast-in-place section is then hoisted and positioned by the H-beam to overcome the elastic deformation of the reinforcing bars caused by the self-weight of the concrete during casting. This results in higher precision in the connection between the cast-in-place and pre-cast sections during closure and prevents excessive residual stress in the reinforcing bars. It also avoids problems such as concrete cracking and localized stress concentration caused by the slow release of residual stress due to temperature changes during later bridge use. Furthermore, connecting components at both ends of the H-beam are used to connect the H-beam to the pre-cast and cast-in-place cantilever beams, respectively. A connecting component in the middle of the H-beam clamps the H-beam in the Z-direction, preventing bending of the H-beam under stress or relative displacement between multiple H-beams. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the three-dimensional connection structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the half-section structure of the present invention (Embodiment 1);

[0014] Figure 3 This is a schematic diagram of a half-section of the present invention (Embodiment 2);

[0015] In the diagram: 1-Cantilever beam with cast-in-place section; 2-Stress connection plate; 3-Embedded bolt; 4-Tie bolt; 5-I-beam; 6-Cantilever beam with cast-in-place section. Detailed Implementation

[0016] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Combination Figures 1-3 This utility model discloses an external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam. The closure direction of the cantilever cast-in-place beam is defined as the Y-direction, its horizontal and vertical directions are defined as the X-direction, and its height direction is defined as the Z-direction. One end of the device is fixed and protrudes from the already cast cantilever beam 1 in the Y-direction, and the other end is fixed to hoist the cast-in-place cantilever beam 6. The device includes: pre-embedded bolts 3, I-beams 5, and connecting components. The pre-embedded bolts are welded and fixed to the reinforcing bars in the already cast cantilever beam and the cast-in-place cantilever beam at both ends of the closure construction area. The pre-embedded bolts are used to fix and hang the connecting components. Multiple I-beams are arranged in parallel and spaced apart. The two ends and the middle section of the I-beams are clamped and connected by the connecting components.

[0019] Preferably, the connecting assembly includes stress connection plates 2 covering the top and bottom surfaces of the I-beam, wherein the stress connection plates located at both ends of the I-beam and connected to the cast-in-place cantilever beam and the precast cantilever beam are Z-directly penetrated and fixed to the pre-embedded bolts with nuts; the stress connection plates located in the middle section of the I-beam are Z-directly penetrated and connected to the opposite sides with tie rods with nuts.

[0020] Preferably, the thickness of the stress connection plate located in the middle section of the I-beam is less than the thickness of the stress connection plates located at both ends of the I-beam, wherein the stress connection plates located in the middle section of the I-beam are all connected with tie rods through in the Z direction.

[0021] Preferably, the thickness of the stress connection plate located in the middle section of the I-beam is equal to the thickness of the stress connection plates located at both ends of the I-beam. Stress connection plates are pressed onto both the top and bottom surfaces of the middle section of the I-beam. The stress connection plate located on the top surface of the middle section of the I-beam is connected to the tie rod through the Z direction, and the bottom end of the tie bolt 4 is welded and fixed onto the stress connection plate located on the bottom surface of the middle section of the I-beam.

[0022] Furthermore, during the construction process, it was discovered that the stress connection plate located on the bottom surface of the I-beam is prone to sticking with hardened concrete after pouring. Especially when it is removed and reassembled at the next construction site, the sticky hardened concrete on the bottom surface of the stress connection plate will reduce the positioning accuracy of the overall I-beam. Therefore, in actual construction, the above problems are solved in two ways:

[0023] 1. For example Figure 2As shown, the stress connection plates above and below the I-beam are swapped, and after construction is completed, the cured concrete adhering to the stress connection plates is cleaned up.

[0024] 2. For example Figure 3 As shown, the stress connection plate and tie bolts on the bottom surface of the middle section of the I-beam are designed as a welded fixing structure to avoid the stress connection plate being difficult to detach from the cured concrete after the closure section is poured.

[0025] Finally, after the closure construction is completed and the concrete has cured, the external consolidation and positioning device for the cantilever cast-in-place beam closure construction of this utility model can be removed. During removal, the nuts are removed from the tie bolts and the pre-embedded bolts, and the stress connection plate and the I-beam are disassembled in sequence. Then the protruding end of the pre-embedded bolt is cut to ensure that the concrete surface of the cantilever beam is flush with the cut surface of the pre-embedded bolt.

[0026] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam, defining the closure direction of the cantilever cast-in-place beam as the Y-direction, its horizontal and vertical directions as the X-direction, and its height direction as the Z-direction, characterized in that: The device has one end fixed and extends out of the cast-in-place cantilever beam in the Y direction, and the other end fixed to hoist the cast-in-place cantilever beam. The device includes: embedded bolts, I-beams and connecting components; the embedded bolts are welded and fixed to the reinforcing bars in the cast-in-place cantilever beams at both ends of the closure construction area, and the embedded bolts are used to fix and hang the connecting components; the I-beams are provided in multiple parallel and spaced arrangement, and the two ends and the middle section of the I-beams are clamped and connected by the connecting components.

2. The external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam according to claim 1, characterized in that: The connecting assembly includes stress connection plates covering the top and bottom surfaces of the I-beam. The stress connection plates located at both ends of the I-beam and connected to the cast-in-place cantilever beam and the precast cantilever beam are Z-directly penetrated and fixed to the pre-embedded bolts with nuts. The stress connection plates located in the middle section of the I-beam are Z-directly penetrated and connected to the tie rods with opposite nuts.

3. The external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam according to claim 2, characterized in that: The thickness of the stress connection plate located in the middle section of the I-beam is less than the thickness of the stress connection plates located at both ends of the I-beam, wherein the stress connection plate located in the middle section of the I-beam is connected to tie rods through in the Z direction.

4. The external consolidation and positioning device for the closure construction of a cantilever cast-in-place beam according to claim 2, characterized in that: The thickness of the stress connection plate located in the middle section of the I-beam is equal to the thickness of the stress connection plates located at both ends of the I-beam. Stress connection plates are pressed onto both the top and bottom surfaces of the middle section of the I-beam. A tie rod is connected through the stress connection plate on the top surface of the middle section of the I-beam in the Z direction, and the bottom end of the tie bolt is welded to the stress connection plate on the bottom surface of the middle section of the I-beam.

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