Continuous beam box indoor tensioning slide

Abstract

The utility model provides a kind of continuous beam box indoor tensioning slide, it is related to the technical field of bridge construction, including continuous beam, steel strand and chain block, two ends of two described steel strands are all from below to above through the embedded hole on the top plate of continuous beam, and be fixed on the upper surface of the top plate of continuous beam by anchorage device, steel strand located at the lower surface of the top plate of continuous beam forms two parallel suspended slides, two described chain blocks are movably hung on two steel strands, the lower end of two described chain blocks is respectively hung a jack, and steel strand forms suspended slide on the lower surface of the top plate of continuous beam, without erecting scaffold or placing large equipment, avoids the construction limitation of the high height of continuous beam box chamber, narrow space, without additional temporary support structure, while avoiding the risk of high-altitude falling and frame body collapse in the process of erecting scaffold, improve safety.

Description

Technical Field

[0001] This utility model relates to the technical field of bridge construction, and more specifically, to an indoor tensioning slide for continuous beam box girders. Background Technology

[0002] Tensioning of the toothed blocks in continuous beams is of paramount importance in the construction quality of continuous beams, especially for large-span continuous beams. Generally, the method for tensioning the box girder of a continuous beam involves transporting personnel and materials into the box girder using medium to large-sized lifting equipment such as truck cranes, followed by the erection of scaffolding for construction.

[0003] If scaffolding or platforms are used to assemble the platform, not only is safety compromised, but improper operation can also lead to accidents. Since the scaffolding is not part of the continuous beam construction, measures such as diamond-shaped hanging baskets for accessing the box girder are no longer available during the full bridge tensioning process. Due to the limited space inside the box girder chambers, insufficient ground flatness, and excessively heavy tensioning jacks, this method is costly, carries significant safety risks, and is neither safe nor economical. Especially for large-span continuous beams, with high top-to-bottom plate height, steep bottom plate slope, and heavy jacks, it is difficult to erect the scaffolding inside the box girder chambers, making it impossible to achieve the conditions for tensioning the top plate teeth. Utility Model Content

[0004] This utility model aims to solve the problem of poor safety when using scaffolding or platforms to assemble the tensioning of long-span continuous beam toothed blocks. The tensioning slide is mainly used when tensioning a continuous beam at height, especially when space is limited, large equipment cannot be hoisted, or scaffolding cannot be erected, so as to achieve the conditions for tensioning operation.

[0005] To solve the above problems, this utility model provides an indoor tensioning slide for a continuous beam box girder, including a continuous beam, two steel strands, and a hand-operated hoist. Both ends of the steel strands pass through two pre-embedded holes on the top plate of the continuous beam from bottom to top and are fixed to the upper surface of the top plate of the continuous beam by anchors. The steel strands located on the lower surface of the top plate of the continuous beam form two parallel suspended slides. The two hand-operated hoists are movably attached to the two steel strands, and a jack is attached to the lower end of each of the two hand-operated hoists.

[0006] The indoor tensioning slide of the continuous beam box girder provided by this utility model has the following beneficial effects compared with the prior art: The steel strands form a suspended slide on the underside of the continuous beam's top slab, eliminating the need for scaffolding or large equipment. This avoids the construction limitations of the high height and narrow space of the continuous beam box chamber, enabling space-free operation. The jacks are moved to the tensioning blocks inside the box chamber via the suspended slide for tensioning, reducing the occupation and interference of the working space inside the box. This allows construction workers to flexibly carry out installation and tensioning adjustments below the suspended slide, solving the pain points of traditional scaffolding, such as space occupation, difficulty in dismantling, and inability to access or rotate large equipment. At the same time, the slide structure composed of double parallel steel strands, combined with the synchronous lifting and horizontal sliding function of the hand-operated hoist, can precisely adjust the height and lateral position of the jacks, ensuring that the jack axis aligns quickly with the pre-drilled holes of the tensioning blocks, avoiding damage to the steel strands or the beam due to lateral forces caused by misalignment. Since no additional temporary support structure is required, the risks of falls from height and scaffolding collapse during scaffolding erection are also avoided, improving safety.

[0007] Furthermore, the hand chain hoist includes a hoist body, a hook, and a chain. The hook is fixed to the top of the hoist body and is used to suspend the hand chain hoist on the steel strand. One end of the chain is connected to the hoist body, and the other end is used to attach a jack. The suspension height of the jack can be adjusted by pulling the chain.

[0008] Furthermore, the lower ends of the two chain hoists are connected together to a jack.

[0009] Furthermore, the hook of the hand chain hoist has an open, lockable structure, and the inner diameter of the hook is adapted to the diameter of the steel strand.

[0010] Furthermore, the length of the steel strand is greater than the distance between the two pre-embedded holes on the top plate of the continuous beam.

[0011] Furthermore, the anchor is a single-hole anchor or a multi-hole anchor.

[0012] Furthermore, the steel strand is made of 7 steel wires twisted together.

[0013] Furthermore, the tensile strength of the steel strand is not less than 1860 MPa.

[0014] Furthermore, the rated lifting capacity of the hand chain hoist is 10T.

[0015] Furthermore, the anchorage secures the steel strand to the top plate of the continuous beam using clamps. Attached Figure Description

[0016] Figure 1 This is a side view of the overall structure of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Continuous beam; 2. Steel strand; 3. Anchorage; 4. Hand chain hoist; 5. Jack. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] See Figure 1 An embodiment of this utility model provides an indoor tensioning slide for a continuous beam box girder, comprising a continuous beam 1, two steel strands 2, and a hand-operated hoist 4. Both ends of the steel strands 2 pass through two pre-embedded holes on the top plate of the continuous beam 1 from bottom to top and are fixed to the upper surface of the top plate of the continuous beam 1 by anchors 3. The steel strands 2 located on the lower surface of the top plate of the continuous beam 1 form two parallel suspended slides. The two hand-operated hoists 4 are movably attached to the two steel strands 2, and a jack 5 is attached to the lower end of each of the two hand-operated hoists 4.

[0025] In this embodiment, the steel strands 2 are inserted through the holes pre-embedded during the construction of the continuous beam 1. The insertion positions are generally the rear anchor reserved holes corresponding to the farthest tensioning tooth block and the rear anchor reserved holes corresponding to the nearest tensioning tooth block. The steel strands 2 form a suspended slide on the lower surface of the top plate of the continuous beam 1, eliminating the need for scaffolding or large equipment. This avoids the construction limitations of the high height and narrow space of the box chamber of the continuous beam 1, enabling operation without occupying space. The jacks 5 are moved to the position of the tensioning tooth block in the box chamber of the continuous beam 1 through the suspended slide for tensioning construction. The specific tensioning process is existing technology and will not be described in detail here.

[0026] Optionally, the hand chain hoist 4 includes a hoist body, a hook, and a chain. The hook is fixed to the top of the hoist body and is used to suspend the hand chain hoist 4 on the steel strand 2. One end of the chain is connected to the hoist body, and the other end is used to attach a jack 5. The suspension height of the jack 5 can be adjusted by pulling the chain.

[0027] In this embodiment, the height of jack 5 can be adjusted by manually pulling the chain, without relying on electric equipment or large lifting tools, and can be precisely adapted to tensioning blocks of different heights.

[0028] Optionally, the lower ends of the two chain hoists 4 are connected to a jack 5.

[0029] In this embodiment, after the jack 5 is moved to the corresponding toothed block position via the slide, the tool anchor and the limiting plate are installed, and the jack 5 is slightly protruded to ensure that the jack 5 and the tool anchor are perpendicular. After the jack 5 is perpendicular, the slide only plays a supporting role to ensure that it is not subjected to force as much as possible, and the tensioning construction can begin. By independently adjusting the chain length of the two hand chain hoists 4, the worker can adjust the tilt angle of the jack 5 in the air and easily achieve the vertical alignment of the jack and the tool anchor.

[0030] Optionally, the hook of the hand chain hoist 4 is an open lockable structure, and the inner diameter of the hook is adapted to the diameter of the steel strand 2.

[0031] In this embodiment, the lockable opening not only allows the hand chain hoist 4 to slide smoothly along the steel strand 2, but also prevents the hook from falling off the steel strand 2 during the tensioning operation.

[0032] Optionally, the length of the steel strand 2 is greater than the distance between the two pre-embedded holes on the top plate of the continuous beam 1.

[0033] In this embodiment, the steel strand 2 is reserved with sufficient length at both ends so that it can be fully inserted into the anchor 3 and extend out of the outside of the anchor 3. This avoids the anchor 3 being unable to effectively clamp due to insufficient length of the steel strand 2, and also allows sufficient space in the suspended slide to facilitate the movement of the hand chain hoist 4.

[0034] Optionally, the anchor 3 is a single-hole anchor or a multi-hole anchor.

[0035] In this embodiment, the anchor 3 is a single-hole anchor or a multi-hole anchor, which is selected according to the size of the pre-embedded hole.

[0036] Optionally, the steel strand 2 is made of 7 steel wires twisted together.

[0037] In this embodiment, the steel strand 2 made of 7 steel wires can distribute the load through stress transfer between the steel wires compared to a single steel wire. This not only improves the overall tensile strength of the steel strand 2, but also enhances its flexibility, making it easier to insert into the pre-embedded hole and less prone to bending and breakage.

[0038] Optionally, the tensile strength of the steel strand 2 is not less than 1860 MPa.

[0039] In this embodiment, it is calculated that the theoretical breaking strength of the steel strand 2 with a tensile strength of 1860MPa is about 26.57 tons, which is much greater than the actual operating load, ensuring that the steel strand 2 will not be broken due to excessive load and guaranteeing the safety of the slide.

[0040] Optionally, the rated lifting capacity of the hand chain hoist 4 is 10T.

[0041] In this embodiment, the maximum weight of the jack 5 is about 1.5 tons, and the rated lifting capacity of 10T is much greater than the actual lifting load, so as to avoid the chain breakage and gear damage caused by overloading of the hand chain hoist 4, and ensure lifting safety.

[0042] Optionally, the anchor 3 fixes the steel strand 2 to the top plate of the continuous beam 1 by means of clamps.

[0043] In this embodiment, after the steel strand 2 is inserted into the anchor 3, the clamp is embedded in the gap between the anchor 3 and the steel strand 2 and tightened, so that the clamp is tightly attached to the steel strand 2, preventing the steel strand 2 from axially slipping during the tensioning operation.

[0044] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A continuous beam box girder indoor tensioning slide, characterized in that, The system includes a continuous beam (1), two steel strands (2) and a hand-operated hoist (4). Both ends of the steel strands (2) pass through two pre-embedded holes on the top plate of the continuous beam (1) from bottom to top and are fixed to the upper surface of the top plate of the continuous beam (1) by anchors (3). The steel strands (2) located on the lower surface of the top plate of the continuous beam (1) form two parallel suspended tracks. The two hand-operated hoists (4) are movably attached to the two steel strands (2) respectively. The lower ends of the two hand-operated hoists (4) are respectively attached to a jack (5).

2. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The hand chain hoist (4) includes a hoist body, a hook and a chain. The hook is fixed to the top of the hoist body and is used to suspend the hand chain hoist (4) on the steel strand (2). One end of the chain is connected to the hoist body and the other end is used to attach a jack (5). The suspension height of the jack (5) can be adjusted by pulling the chain.

3. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The lower ends of the two chain hoists (4) are connected to the same jack (5).

4. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The hook of the hand chain hoist (4) is an open lockable structure, and the inner diameter of the hook is compatible with the diameter of the steel strand (2).

5. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The length of the steel strand (2) is greater than the distance between the two pre-embedded holes on the top plate of the continuous beam (1).

6. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The anchor (3) is a single-hole anchor or a multi-hole anchor.

7. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The steel strand (2) is made of 7 steel wires twisted together.

8. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The tensile strength of the steel strand (2) is not less than 1860 MPa.

9. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The rated lifting capacity of the hand chain hoist (4) is 10T.

10. The continuous beam box girder indoor tensioning slide according to claim 1, characterized in that, The anchor (3) fixes the steel strand (2) to the top plate of the continuous beam (1) by means of clamps.

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