A temporary anchoring structure for the first segment of a cantilever beam

Abstract

This utility model provides a temporary consolidation structure for the first segment of a cantilever beam, including a pier cap. A permanent support is provided at the middle of the top of the pier cap. Multiple sets of temporary sand boxes are placed on the top of the pier cap. The first segment to be fixed is supported on the top of the temporary sand boxes and the permanent support. Tensioning bases are symmetrically arranged on both sides of the top of the first segment. Prestressed tendons pass through the interior of the tensioning bases, and the other end of the prestressed tendons passes through the reserved holes inside the first segment and the pier cap in sequence before connecting to the tensioning base on the other side. This solves the problem of temporary consolidation between the pier and the first segment using concrete, avoiding the need for manual removal of concrete for system conversion after the beam construction is completed, which would affect the appearance of the concrete. Moreover, the structure is applicable to the construction of the first segment of most cantilever beams, taking into account the convenience, safety, and economy of construction.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, specifically to a temporary consolidation structure for the first segment of a cantilever beam. Background Technology

[0002] Cantilever beam structures are a common structural form in bridges. The 0# block (first segment) typically requires temporary consolidation during construction, which is then removed after system conversion. Currently, the main construction method for the 0# block of bridge piers involves pouring concrete between the pier top and the 0# block to form a temporary consolidation. This method requires high construction precision, and the temporary consolidation concrete needs to be manually removed after construction, posing high safety risks and affecting the appearance of the concrete surface. To address these issues, the temporary consolidation method for the 0# block of cantilever beams needs to be improved. Utility Model Content

[0003] The purpose of this utility model is to address existing problems by providing a temporary consolidation structure for the first segment of a cantilever beam. This structure solves the problem of temporarily consolidating the pier and the first segment with concrete, avoiding the need for manual removal of concrete after beam construction to perform system conversion, which would affect the appearance of the concrete. Furthermore, the structure is applicable to the construction of the first segment of most cantilever beams, taking into account construction convenience, safety, and economy.

[0004] To achieve the above-mentioned technical features, the purpose of this utility model is as follows: A temporary consolidation structure for the first segment of a cantilever beam includes a pier cap, a permanent support is provided at the middle of the top of the pier cap, multiple sets of temporary sand boxes are placed on the top of the pier cap, the top of the temporary sand boxes and the permanent support supports the first segment to be fixed, and tensioning bases are symmetrically arranged on both sides of the top of the first segment. Prestressed tendons pass through the interior of the tensioning bases, and the other end of the prestressed tendons passes through the reserved holes inside the first segment and the pier cap in sequence and is connected to the tensioning base on the other side.

[0005] Preferably, the temporary sandboxes are arranged in pairs in multiple groups on top of the pier cap and on both sides of the permanent support.

[0006] Preferably, the initial height of the temporary sandbox is consistent with the height of the permanent support.

[0007] Preferably, the tensioning base is precast using concrete casting.

[0008] Preferably, the prestressing tendons, the first block, and the pier cap are provided with prestressing ducts for passing through the prestressing tendons.

[0009] Preferably, the number of prestressing tendons is at least two sets.

[0010] Preferably, the prestressed tendons are tensioned using a tensioning instrument.

[0011] The present invention has the following beneficial effects:

[0012] 1. This utility model solves the problem of fixing the 0# block and the box girder together by installing prestressing tendons in the two prestressing ducts reserved in the 0# block and completing the temporary consolidation after tensioning the prestressing tendons; the sand box can be removed after tensioning is completed; it solves the problem of consolidation between the 0# block and the box girder through concrete, while protecting the concrete surface from being affected. At the same time, the use of CNC tensioning instrument for bracing tensioning can better control the level of the 0# block and ensure the beam alignment.

[0013] 2. The sand box support of this utility model can make the bottom of block 0# more stable, and further improve the stability of block 0# during construction.

[0014] 3. The precast concrete block of this utility model, as a prestressed tensioning base, can not only ensure that the surface of the beam is not damaged, but also expand the tensioning force area, and can be reused, which is simple, quick and easy and reduces costs.

[0015] 4. After the beam construction of this utility model is completed, the system conversion can be completed immediately by releasing the tensioned prestressing tendons, which is convenient, quick, economical and efficient. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a front view of the structure of this utility model.

[0018] Figure 2 This is a side view of the structure of this utility model.

[0019] Figure 3 This is a plan view of the beam top structure of this utility model.

[0020] Figure 4 This is a plan view of the pier top structure of this utility model.

[0021] In the diagram: 1. Prestressed tendon; 2. Prestressed duct; 3. Tensioning base; 4. Permanent support; 5. Temporary sand box; 6. First block; 7. Pier cap. Detailed Implementation

[0022] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0023] like Figure 1-4As shown, a temporary consolidation structure for the first segment of a cantilever beam includes a pier cap 7. A permanent support 4 is provided at the middle of the top of the pier cap 7. Multiple sets of temporary sand boxes 5 are placed on the top of the pier cap 7. The first segment 6 to be fixed is supported on the top of the temporary sand boxes 5 and the permanent support 4. Tensioning bases 3 are symmetrically arranged on both sides of the top of the first segment 6. Prestressing tendons 1 pass through the interior of the tensioning bases 3, and the other end of the prestressing tendons 1 passes through the reserved holes inside the first segment 6 and the pier cap 7 in sequence and then connects to the tensioning base 3 on the other side. This invention forms a consolidation between the first segment and the pier top by passing the prestressing tendons through prestressing ducts; the system conversion is achieved by releasing the prestress. With this method, there is no need to pour concrete on the pier top to form a temporary consolidation, and the structure is simple, easy to operate, and safe and reliable. During the specific construction process, the first section 6 is supported on top of the permanent support 4 by the temporary sand box 5, and then the prestressed tendons 1 are tensioned, so that the first section 6 is reliably fixed on top of the permanent support 4. When it needs to be dismantled later, only the tensioning base 3 needs to be removed.

[0024] Furthermore, the temporary sand boxes 5 are arranged in pairs on top of the pier cap 7 and on both sides of the permanent support 4. Using these temporary sand boxes 5, during the construction of the first section 6, they are placed in a predetermined position by a tower crane for the fabrication of the first section 6. The temporary sand boxes 5 are dismantled from the bottom formwork of the box girder through the sand discharge port.

[0025] Furthermore, the initial height of the temporary sandbox 5 is kept consistent with the height of the permanent support 4. (Through...)

[0026] Furthermore, the tensioning base 3 is precast using concrete casting. As a prestressed tendon tensioning base, the tensioning base 3 serves to diffuse the tensioning area, protect the beam structure, and can be reused, thus reducing costs.

[0027] Furthermore, the prestressed tendon 1, the first section block 6, and the pier cap 7 are provided with prestressed ducts 2 for passing through the prestressed tendon 1. There are at least two prestressed ducts 2, which pass through the pier cap 7, the first section block 6, and the tensioning base 3 to form a U-shape.

[0028] Furthermore, the number of prestressing tendons 1 is at least two sets. By using at least two sets, the uniformity of force on the first block 6 is ensured, thereby guaranteeing the reliability of installation and fixation.

[0029] Furthermore, the prestressed tendon 1 is tensioned using a tensioning instrument. By using a tensioning instrument to perform symmetrical tensioning at both ends, it is ensured that the tension force and elongation are consistent.

[0030] The working process and principle of this utility model:

[0031] 1. See Figure 1-4During the construction of the pier cap 7, the first block 6, and the tensioning base 3, pre-set prestressed ducts 2 for the passage of two prestressed ducts 1, and control the spacing of the prestressed ducts.

[0032] 2. Permanent support 4 and temporary sand box 5 are installed in the predetermined position by tower crane during the construction of the first section 6, and are used to fabricate the first section 6.

[0033] 3. After the strength of the first block 6 meets the requirements, the prestressed tendon 1 is transferred into the prestressed duct 2 and tensioned symmetrically at both ends by a CNC tensioning instrument to ensure that the tension force and elongation are consistent.

[0034] 4. After stabilization, remove the temporary sand box 5 at the bottom of the first block 6.

Claims

1. A temporary fixed structure for the first segment of a cantilever beam, characterized in that, The pier cap (7) includes a permanent support (4) at the top center of the pier cap (7). Multiple sets of temporary sand boxes (5) are placed on the top of the pier cap (7). The top of the temporary sand boxes (5) and the permanent support (4) supports the first section block (6) to be fixed. Tensioning bases (3) are symmetrically arranged on both sides of the top of the first section block (6). The prestressed tendons (1) pass through the inside of the tensioning base (3), and the other end of the prestressed tendons (1) passes through the reserved holes inside the first section block (6) and the pier cap (7) in sequence and is connected to the tensioning base (3) on the other side.

2. The temporary fixed structure for the first segment of a cantilever beam according to claim 1, characterized in that: The temporary sandboxes (5) are arranged in pairs in multiple groups on the top of the pier cap (7) and on both sides of the permanent support (4).

3. The temporary fixed structure for the first segment of a cantilever beam according to claim 1, characterized in that: The initial height of the temporary sandbox (5) is consistent with the height of the permanent support (4).

4. The temporary fixed structure for the first segment of a cantilever beam according to claim 1, characterized in that: The tensioning base (3) is precast by concrete pouring.

5. The temporary fixed structure for the first segment of a cantilever beam according to claim 1, characterized in that: The prestressed tendon (1), the first block (6) and the pier cap (7) are provided with prestressed ducts (2) for passing through the prestressed tendon (1).

6. The temporary fixed structure for the first segment of a cantilever beam according to claim 1, characterized in that: The number of prestressed tendons (1) is at least 2 sets.

7. The temporary fixed structure for the first segment of a cantilever beam according to claim 1, characterized in that: The prestressed tendon (1) is tensioned using a tensioning instrument.

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