A post-anchored lower anchoring cable foundation for existing bridges

Abstract

The utility model relates to bridge engineering technical field, concretely relates to a kind of post-anchored lower anchorage cable foundation for existing bridge, fixedly connected on existing beam body flange, including nut, pre-buried steel sheet, cast-in-place concrete foundation, long rod anchor bolt and fastening steel sheet, cast-in-place concrete foundation is set at the top of existing beam body flange, pre-buried steel sheet is pre-buried to the top of cast-in-place concrete foundation when cast-in-place concrete foundation pours, fastening steel sheet is set at the bottom of existing beam body flange, a plurality of long rod anchor bolts are sequentially passed through existing beam body flange, cast-in-place concrete foundation and pre-buried steel sheet by nut fastening from bottom to top.The post-anchored lower anchorage cable foundation for existing bridge has post-constructability, does not need beam body pre-buried, is suitable for existing bridge repair reconstruction, solves pre-buried problem.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically to a rear-anchored anchorage foundation for existing bridges. Background Technology

[0002] In the field of railway or highway bridge engineering, the erection of electrified contact networks is a key link in ensuring the power supply for train operation. In order to stably support and fix the contact network supports, it is usually necessary to pre-install anchor wire foundations on the bridge structure. These foundations ensure the stability and safety of the contact network system by anchoring the contact network supports with guy wires.

[0003] However, traditional anchor wire foundation installation methods have a series of significant problems and limitations: Traditional methods mainly rely on pre-embedding steel plates and anchor bolts during the beam casting process. This method requires precise determination of the anchor wire foundation's location and dimensions in the early stages of bridge construction, and the pre-embedded parts must be cast in one continuous process with the beam concrete. However, in actual construction, due to various unforeseen factors such as construction errors, design changes, or site limitations, errors in the placement of pre-embedded parts, damage, or loss frequently occur. Because the pre-embedding work is closely synchronized with beam casting, once problems arise, effective remediation is often impossible in subsequent stages. This often leads to serious project delays and additional economic losses. More importantly, the way anchors are embedded in traditional structural designs also brings great difficulty in adjustment. In the traditional method, the anchors are completely embedded in the concrete and welded to the underlying steel plate. Although this design ensures the stability of the structure to a certain extent, it sacrifices the flexibility of adjustment. Once the pre-embedded position deviates, the adjustment becomes extremely difficult, and in some cases even irreversible, because the anchors are already encased in concrete and welded. This not only increases the risk and cost of construction, but may also pose a potential threat to the overall structural safety of the bridge.

[0004] Furthermore, with the increasing service life of existing bridges and the continuous increase in traffic flow, many bridges need to undergo defect repair or renovation and upgrading. In this process, how to efficiently and reliably install the anchor wire foundation has become an urgent problem to be solved. The traditional pre-embedded method obviously cannot meet this requirement because it cannot be flexibly adjusted and installed after the beam is built.

[0005] Therefore, given the existing bridge conditions, it is particularly urgent and necessary to develop a new anchor wire foundation structure that can be installed with high precision and reliability after the bridge beam is built. Summary of the Invention

[0006] To address the aforementioned issues, this utility model provides a post-anchored lower anchor wire foundation for existing bridges. This post-anchored lower anchor wire foundation for existing bridges features post-construction capability, eliminating the need for pre-embedding in the beam structure, making it suitable for the repair and renovation of existing bridges and solving the pre-embedding problem; high reliability, employing a "penetrating flange plate + bottom steel plate clamping" and multiple structures to enhance anchoring force; strong adjustability, allowing for precise on-site positioning, with split fastening steel plates reducing installation difficulty and adapting to uneven conditions; convenient construction, with split lower steel plates and extended bolts facilitating operation in confined spaces; strong adaptability, with long anchor bolts of varying lengths to accommodate flanges of varying thicknesses; and good durability, with exposed surfaces of key components having anti-corrosion layers to extend service life.

[0007] The technical solution of this utility model is as follows:

[0008] A rear-anchored anchorage foundation for existing bridges, fixedly connected to the flange of the existing beam, includes nuts, embedded steel plates, cast-in-place concrete foundations, long anchor bolts, and fastening steel plates. The cast-in-place concrete foundation is located at the top of the existing beam flange. The embedded steel plates are pre-embedded at the top of the cast-in-place concrete foundation during its pouring. The fastening steel plates are located at the bottom of the existing beam flange. Several long anchor bolts pass through the existing beam flange, the cast-in-place concrete foundation, and the embedded steel plates sequentially from bottom to top and are fastened by nuts.

[0009] Furthermore, a steel reinforcement cage is provided in the cast-in-place concrete foundation. The steel reinforcement cage is composed of steel bars A embedded in the existing beam and steel bars B set inside the cast-in-place concrete foundation, which are connected to each other.

[0010] Furthermore, the long bolt anchor consists of an anchor head, a smooth rod, and a threaded rod.

[0011] Furthermore, bolt holes A are provided on the fastening steel plate. Bolt holes A are round holes with a diameter greater than that of the smooth rod and the threaded rod but smaller than that of the anchor head. After the smooth rod and the threaded rod of the long anchor bolt pass through bolt holes A, the anchor head is tightly attached to the bottom surface of the fastening steel plate.

[0012] Furthermore, bolt holes B are provided on the embedded steel plate. Bolt holes B are circular holes with a diameter larger than the diameter of the smooth rod and the screw rod but smaller than the diameter of the inscribed circle of the nut. The screw rod of the long rod anchor bolt passes through bolt hole B and engages with the nut threadedly. The nut is tightly attached to the top of the embedded steel plate.

[0013] Furthermore, the bottom surface of the existing beam flange is an inclined surface, and the top surface of the fastening steel plate is an inclined surface that fits tightly against the bottom surface of the existing beam flange.

[0014] Furthermore, each of the long anchor bolts arranged along the bridge direction shares a single fastening steel plate.

[0015] Furthermore, the exposed surfaces of the nuts, embedded steel plates, long anchor bolts, and fastening steel plates are all provided with anti-corrosion treatment layers.

[0016] Furthermore, the long rod anchors include long rod anchors A and B that are adapted to different existing beam flanges. Long rod anchors A and B have different lengths. Long rod anchor A consists of anchor head A, smooth rod A and threaded rod A, while long rod anchor B consists of anchor head B, smooth rod B and threaded rod B.

[0017] Furthermore, steel bar A is fixed to the drilled hole in the flange of the existing beam using anchoring adhesive, and is tied to steel bar B in the cast-in-place concrete foundation to form an integral steel reinforcement skeleton.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model discloses a rear-anchored anchorage foundation for existing bridges. This rear-anchored anchorage foundation for existing bridges does not require pre-embedding during the construction of the beam. It is particularly suitable for the repair or renovation and upgrading of existing bridges. It solves the problem that if the pre-embedding position is incorrect, or the pre-embedding parts are damaged or lost during the construction stage, it cannot be remedied. It provides an effective solution for the subsequent treatment of existing bridges.

[0020] 2. The present invention discloses a rear-anchored lower anchor wire foundation for existing bridges. The rear-anchored lower anchor wire foundation for existing bridges adopts a mechanical anchoring method of "penetrating the flange plate + bottom steel plate clamping". Combined with rebar and concrete foundation, multiple force transmission paths are formed, which significantly enhances the anchoring force and greatly improves the safety and reliability of the entire lower anchor wire foundation, and can effectively bear the load of the lower anchor wire.

[0021] 3. The present invention discloses a rear-anchored anchorage foundation for existing bridges. During installation, the rear-anchored anchorage foundation for existing bridges can be precisely laid out and positioned on site, avoiding the drawbacks of traditional pre-embedded methods where it is formed in one go and cannot be adjusted, thus greatly improving construction accuracy. The fastening steel plate is designed as a split type, which reduces the installation difficulty and can better adapt to the unevenness that may exist under the beam, further enhancing the adjustability and adaptability of the structure.

[0022] 4. The present invention discloses a rear-anchored lower anchor wire foundation for existing bridges. The rear-anchored lower anchor wire foundation for existing bridges has an anti-corrosion treatment layer on the exposed surfaces of nuts, embedded steel plates, long rod anchors and fastening steel plates, which can effectively prevent metal parts from rusting and corroding, ensure that these key components maintain good performance during long-term use, and extend the service life of the entire lower anchor wire foundation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a rear-anchored anchorage foundation for an existing bridge, according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a long rod anchor bolt A for a rear-anchored lower anchor wire foundation of an existing bridge, according to an embodiment of the present utility model.

[0025] Figure 3 This is a schematic diagram of the structure of a long rod anchor bolt B for a rear-anchored lower anchor wire foundation of an existing bridge, according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the fastening steel plate of a rear-anchored lower anchor wire foundation for an existing bridge, according to an embodiment of the present utility model.

[0027] Figure 5 for Figure 4 Top view;

[0028] Figure 6 This is a top view of a pre-embedded steel plate for a rear-anchored anchorage foundation of an existing bridge, according to an embodiment of the present utility model.

[0029] The components represented by the various reference numerals in the diagram are:

[0030] This utility model includes: 1. Nut, 2. Embedded steel plate, 3. Cast-in-place concrete foundation, 4. Reinforcing bar A, 5. Reinforcing bar B, 6. Long rod anchor bolt A, 601. Anchor bolt head A, 602. Plain rod A, 603. Screw rod A, 7. Long rod anchor bolt B, 701. Anchor bolt head B, 702. Plain rod B, 703. Screw rod B, 8. Fastening steel plate, 9. Existing beam flange, 10. Bolt hole A, 11. Bolt hole B. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0032] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0033] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0034] like Figure 1 As shown, the rear-anchored lower anchor wire foundation for existing bridges includes, from top to bottom, a nut 1, a pre-embedded steel plate 2, a cast-in-place concrete foundation 3, a reinforcing bar A4 embedded in the existing beam, a reinforcing bar B5 in the cast-in-place concrete foundation structure, a long anchor bolt A6, a long anchor bolt B7, a fastening steel plate 8, an existing beam flange 9, a bolt hole A10, and a bolt hole B11; among which, the penetrating anchoring system composed of the nut 1, the pre-embedded steel plate 2, the reinforcing bar A4 embedded in the existing beam, the long anchor bolt A6, the long anchor bolt B7, and the fastening steel plate 8 is the core of this utility model.

[0035] Nut 1 is used after the construction of the cast-in-place concrete foundation 3, the cast-in-place concrete foundation structural steel reinforcement B5 and other penetrating anchoring system components is completed. It is used together with long rod anchor bolt A6 and long rod anchor bolt B7 to form an anchoring system, which firmly clamps the lower anchor line to the foundation.

[0036] The pre-embedded steel plate 2 is embedded into the top surface of the foundation during the construction of the cast-in-place concrete foundation 3, and is used to connect the lower anchor line to the foundation, such as... Figure 6 As shown, it is provided with four bolt holes B11. Bolt holes B11 are round holes with a diameter larger than the diameter of the smooth rod and the screw of the long rod anchor and smaller than the diameter of the inscribed circle of the nut 1. The screw of the long rod anchor passes through the bolt hole B11 and is threaded into the nut 1. The nut 1 is tightly attached to the top of the embedded steel plate 2.

[0037] The cast-in-place concrete foundation 3 is a concrete foundation cast on top of the existing beam flange 9 to bear the load of the anchor wire. It is equipped with a steel reinforcement cage, which is composed of steel reinforcement A4 embedded in the existing beam and steel reinforcement B5 set inside the cast-in-place concrete foundation 3.

[0038] Before casting the cast-in-place concrete foundation 3, the reinforcing bar A4 is inserted into the existing beam. After the location of the reinforcing bars in the existing beam is determined by a reinforcing bar detector, blind holes are drilled on the flange 9 of the existing beam. After cleaning the holes, anchoring adhesive is injected, and reinforcing bar A4 is inserted into the holes to connect the cast-in-place concrete foundation 3 and the flange 9 of the existing beam. Together with the reinforcing bar B5 of the cast-in-place concrete foundation, they form a reinforcing bar skeleton to enhance the load-bearing capacity of the cast-in-place concrete foundation 3.

[0039] The structural reinforcement B5 of the cast-in-place concrete foundation is a structural reinforcement inside the cast-in-place concrete foundation 3. It is tied with the reinforcement A4 embedded in the existing beam to form a reinforcement skeleton, thereby enhancing the load-bearing capacity of the cast-in-place concrete foundation 3.

[0040] like Figure 2 As shown, the long anchor bolt A6 consists of an anchor head A601, a smooth rod A602, and a threaded rod A603. It passes through the embedded steel plate 2, the cast-in-place concrete foundation 3, the existing beam flange 9, and the fastening steel plate 8 from top to bottom. It is the core of the penetrating anchoring system. It is bolted to the embedded steel plate 2 at the top with a matching nut 1, and fastened to the existing beam flange 9 at the bottom with the fastening steel plate 8, so as to anchor the cast-in-place concrete foundation 3 and the existing beam flange 9.

[0041] like Figure 3 As shown, the long anchor bolt B7 consists of an anchor head B701, a smooth rod B702, and a threaded rod B703. Because the existing beam flange 9 is usually of variable thickness, the length of the long anchor bolt B7 is different from that of the long anchor bolt A6, but the rest are the same. Its function is the same as that of the long anchor bolt A6. It passes through the embedded steel plate 2, the cast-in-place concrete foundation 3, the existing beam flange 9, and the fastening steel plate 8 from top to bottom. It is bolted to the embedded steel plate 2 at the top with a matching nut 1, and fastened to the existing beam flange 9 at the bottom with the fastening steel plate 8, in order to anchor the cast-in-place concrete foundation 3 and the existing beam flange 9.

[0042] The fastening steel plate 8 is placed between the existing beam flange 9 and the long anchor bolts A6 and B7. This serves to level the bottom of the penetrating anchoring system and enhance the bolting capability. Figure 4 and Figure 5As shown, two bolt holes A10 are provided on it. Bolt holes A10 are round holes with a diameter larger than the diameter of the smooth rod and the screw rod but smaller than the diameter of the anchor bolt head. After the smooth rod and the screw rod of the long rod anchor bolt pass through the bolt holes A10, the anchor bolt head is tightly attached to the bottom surface of the fastening steel plate 8. If the bottom surface of the existing beam flange 9 is a slope, the top surface of the fastening steel plate 8 is a slope that fits tightly with the bottom surface of the existing beam flange 9. The number of fastening steel plates 8 is half the number of long rod anchor bolts, and the corresponding number of pre-embedded steel plates 2 is half the number of fastening steel plates 8. That is, the fastening steel plate 8 is a split design, that is, each pair of long rod anchor bolts arranged in the longitudinal direction of the bridge shares an independent steel plate. This reduces the installation difficulty and adapts to the possible unevenness of the beam bottom.

[0043] Existing beam flange 9 refers to the existing beam flange that has already been constructed.

[0044] like Figure 4 As shown, bolt hole A10 is a round hole opened in the fastening steel plate 8, through which long rod anchor bolts A6 and B7 pass.

[0045] like Figure 5 As shown, bolt hole B11 is a round hole opened in the pre-embedded steel plate 2, through which the screws of long rod anchors A6 and B7 pass.

[0046] The fabrication and installation of the post-anchored guy wire foundation for existing bridges includes the following steps:

[0047] Step 1: On-site positioning and preparation

[0048] First, accurately lay out the design location of the existing bridge flange plate. Then, use methods such as a rebar detector to clarify the location of the existing beam rebar, so as to accurately determine the subsequent drilling location and avoid damaging the original structure.

[0049] Step 2: Drilling

[0050] Using a water drill or similar equipment, drill through holes in the flange plate from top to bottom according to the positions marked on the design drawings to pass through the long rod anchor bolts. At the same time, drill blind holes at designated positions to insert reinforcing steel bars.

[0051] Step 3: Install the anchoring system

[0052] Rebar insertion: After cleaning the drill hole, inject anchoring adhesive, and then insert the reinforcing steel bar (i.e., the A4 steel bar of the existing beam) into the hole and wait for it to cure.

[0053] Install the lower assembly: Pre-fit the fastening steel plate 8 onto the long rod anchor bolts A6 and B7, and pass it through the drilled through hole from below the flange plate;

[0054] Tightening: Tighten the nuts at the ends of the long anchor bolts to ensure that the fastening steel plate 8 is tightly attached to the concrete at the bottom of the beam;

[0055] Step 4: Pour the concrete foundation

[0056] Erect formwork and pour the pre-embedded steel plate 2, the exposed anchor bolt part on the foundation surface and the implanted steel bars into the cast-in-place concrete foundation 3 to form a complete anchor wire foundation.

[0057] Preferably, all exposed metal parts, such as anchor bolts, nuts, washers, and upper and lower steel plates, are provided with an anti-corrosion treatment layer formed by anti-corrosion treatment such as multi-alloy co-infiltration + zinc-chromium coating + sealing layer treatment, to ensure long-term durability.

[0058] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A rear-anchored anchorage foundation for existing bridges, fixedly connected to the flange (9) of the existing beam, characterized in that, Includes nuts (1), embedded steel plates (2), cast-in-place concrete foundations (3), long anchor bolts and fastening steel plates (8). The cast-in-place concrete foundations (3) are set at the top of the existing beam flanges (9). The embedded steel plates (2) are embedded at the top of the cast-in-place concrete foundations (3) during the pouring of the cast-in-place concrete foundations (3). The fastening steel plates (8) are set at the bottom of the existing beam flanges (9). Several long anchor bolts pass through the existing beam flanges (9), the cast-in-place concrete foundations (3) and the embedded steel plates (2) from bottom to top and are fastened by nuts (1).

2. The rear-anchored anchorage foundation for existing bridges as described in claim 1, characterized in that, The cast-in-place concrete foundation (3) is provided with a steel reinforcement cage, which is composed of steel reinforcement A (4) embedded in the existing beam and steel reinforcement B (5) set inside the cast-in-place concrete foundation (3) connected to each other.

3. The rear-anchored anchorage foundation for existing bridges as described in claim 1, characterized in that, The long rod anchor bolt consists of an anchor head, a smooth rod, and a threaded rod.

4. The rear-anchored anchorage foundation for existing bridges as described in claim 3, characterized in that, The fastening steel plate (8) is provided with bolt holes A (10). Bolt holes A (10) are round holes. The diameter of bolt holes A (10) is greater than the diameter of the smooth rod and the screw and less than the diameter of the anchor head. After the smooth rod and the screw of the long rod anchor pass through bolt holes A (10), the anchor head is tightly attached to the bottom surface of the fastening steel plate (8).

5. A rear-anchored anchorage foundation for existing bridges as described in claim 3, characterized in that, The embedded steel plate (2) is provided with bolt holes B (11). Bolt holes B (11) are round holes. The diameter of bolt holes B (11) is greater than the diameter of the smooth rod and the screw and less than the diameter of the inscribed circle of the nut (1). The screw of the long rod anchor passes through bolt holes B (11) and is threaded into the nut (1). The nut (1) is tightly attached to the top of the embedded steel plate (2).

6. A rear-anchored anchorage foundation for existing bridges as described in claim 1, characterized in that, The bottom surface of the existing beam flange (9) is an inclined surface, and the top surface of the fastening steel plate (8) is an inclined surface that fits tightly against the bottom surface of the existing beam flange (9).

7. A rear-anchored anchorage foundation for existing bridges as described in claim 1, characterized in that, Each pair of long anchor bolts arranged along the bridge direction shares a fastening steel plate (8).

8. A rear-anchored anchorage foundation for existing bridges as described in claim 1, characterized in that, The exposed surfaces of the nut (1), the embedded steel plate (2), the long rod anchor bolt, and the fastening steel plate (8) are all provided with an anti-corrosion treatment layer.

9. A rear-anchored anchorage foundation for existing bridges as described in claim 6, characterized in that, The long anchor bolts include long anchor bolt A (6) and long anchor bolt B (7) adapted to different existing beam flanges (9), and the long anchor bolt A (6) and long anchor bolt B (7) have different lengths.

10. A rear-anchored guy wire foundation for existing bridges as described in claim 2, characterized in that, The steel bar A (4) is fixed in the drilled hole of the existing beam flange (9) by the anchoring adhesive and tied to the steel bar B (5) in the cast-in-place concrete foundation (3) to form an integral steel bar skeleton.

Images