Self-anchored arch rib support foundation

Abstract

The utility model provides a self-anchored arch rib support foundation which comprises a plurality of anti-pulling anchor rods, a plurality of supporting rods, a plurality of supporting rods, a plurality of supporting rods, a plurality of supporting rods, a plurality of supporting rods, a plurality of supporting rods, a plurality of supporting rods and a plurality of supporting rods. The middle portions and the lower portions of the supporting rods penetrate into a ground foundation. The enlarged foundation is fixedly connected to the upper portion of the anti-pulling anchor rod, and the top face of the enlarged foundation is lower than the top end of the anti-pulling anchor rod. The utility model has better pulling resistance and pressure resistance, and can ensure the stability of the cable rope and the arch rib bracket in the process of aligning and assembling the arch rib.

Description

Technical Field

[0001] This utility model relates to the field of steel-concrete composite arch bridge construction technology, and in particular to a self-anchored arch rib support foundation. Background Technology

[0002] A steel-concrete composite arch bridge is a bridge structure that uses a combination of steel pipes and concrete to bear the bridge deck load. It consists of steel pipes and concrete; the steel pipes bear the bridge deck load, while the concrete protects the steel pipes and evenly distributes the load. On land, steel-concrete composite arch bridges are often constructed using a scaffolding method. This involves erecting temporary arch rib supports below the designed arch rib locations. These supports serve as supports for the alignment and assembly of the arch ribs. The arch ribs are divided into multiple prefabricated segments, which are then hoisted onto the arch rib supports for alignment and welding. During construction, because the arch rib supports are typically tall and narrow, lateral wind loads are significant. Therefore, methods such as lateral cable wind resistance are used to counteract these loads. For example, invention patent CN107245956A discloses a construction method for a steel arch bridge, which describes: first, one section is installed below the joint of the large sections to be assembled... A portal frame arch rib support is installed, with the portal frame positioned approximately 1000mm horizontally from the upper end of the arch rib. The columns are connected using I-beams or steel pipes. Two-way guy ropes are installed to ensure the stability of the support. These guy ropes must be anchored at points on both sides of the transverse direction of the arch bridge. However, if the site is narrow on both sides of the transverse direction of the arch bridge, it is not possible to install corresponding guy ropes to resist wind loads. To overcome the above problems, this project designs a self-anchored arch rib support. The guy ropes of the arch rib support are anchored to the foundation of the adjacent arch rib support. Therefore, an arch rib support foundation with good pull-out resistance must be designed to ensure the stability of the guy ropes and the arch rib support. Utility Model Content

[0003] This utility model discloses a self-anchored arch rib support foundation, which has good pull-out resistance and compressive strength, and can ensure the stability of the guy ropes and arch rib support during the arch rib alignment and assembly process.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A self-anchored arch rib support foundation includes:

[0006] The anti-pull-out anchor bolts are multiple in number, with the middle and lower parts extending into the ground foundation and being fixed together with the ground foundation;

[0007] An enlarged foundation is fixed to the upper part of the pull-out anchor, and its top surface is lower than the top of the pull-out anchor.

[0008] Preferably, the pull-out anchor includes a pull-out anchor body, an anchor plate, and a nut. The middle and lower parts of the pull-out anchor body extend into the ground foundation and are fixed together with the ground foundation. The upper part is fixed to the enlarged foundation. The anchor plate has a through hole and can be matched to pass through the pull-out anchor body and abut against the top surface of the enlarged foundation. The nut can be matched to be screwed into the pull-out anchor body and abut against the top surface of the anchor plate.

[0009] Preferably, a reinforcing steel structure is pre-embedded within the enlarged foundation at a location near its top surface and close to the pull-out anchor body.

[0010] Preferably, the reinforced steel structure includes at least two reinforcing bars.

[0011] Preferably, the pull-out anchor is fixed to the ground foundation by an anchor body.

[0012] Preferably, the anchor body is M40 cement mortar.

[0013] Preferably, at least six pull-out anchors are provided, arranged symmetrically with respect to the centerline of the widened foundation.

[0014] Preferably, the depth to which the pull-out anchor is inserted into the ground foundation is not less than 10m.

[0015] Preferably, the thickness of the enlarged foundation is not less than 0.8m.

[0016] The self-anchored arch rib support foundation described above has the following advantages:

[0017] (1) This utility model adopts an enlarged foundation to improve the compressive strength of the support foundation and an anti-pull-out anchor rod to improve the pull-out force of the support foundation. The combination of the two can ensure the stability of the guy rope and the arch rib support during the arch rib alignment and assembly process.

[0018] (2) The present invention further includes an anchor plate and a nut in the pull-out anchor rod and a reinforcing steel structure in the enlarged foundation. Through the connection between the anchor plate and the reinforcing steel structure and the tightening of the nut, the pull-out resistance of the support foundation is further improved. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A schematic diagram of the right-side structure.

[0021] Figure 3 yes Figure 1 A top-view structural diagram.

[0022] Figure 4 This is an enlarged structural schematic diagram of the pull-out anchor bolt.

[0023] In the diagram, the enlarged foundation is 100, the reinforced steel structure is 110, the pull-out anchor is 200, the pull-out anchor body is 210, the nut is 220, the anchor plate is 230, the grouting pipe is 240, the anchor hole is 300, and the arch rib support column is 400. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] In the description of this utility model, it should be noted 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, or the orientation or positional relationship that the utility model product is usually placed in during use. 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.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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.

[0027] A self-anchored arch rib support foundation, combined with Figure 1 and Figure 2As shown, the system includes tensile anchors 200 and enlarged foundations 100. The tensile anchors 200 are multiple in number, extending into the ground foundation at the middle and lower parts and fixed together. In land areas, the tensile anchors 200 effectively improve the tensile strength of the support foundation, with a short construction period and relatively low construction cost. The enlarged foundation 100 is fixed above the tensile anchors 200, with its top surface lower than the top of the tensile anchors 200, meaning the top of the tensile anchors 200 protrudes from the enlarged foundation 100. The enlarged foundation 100 is generally poured on the ground foundation, or the ground foundation can be excavated to a certain depth so that the enlarged foundation 100 is partially or completely poured into the ground foundation. Using the enlarged foundation 100 can improve the compressive strength of the support foundation. The combination of the tensile anchors 200 and the enlarged foundation 100 effectively ensures the stability of the guy ropes and arch rib support during arch rib alignment and assembly.

[0028] The above-mentioned self-anchored arch rib support foundation can be constructed using the following method: First, drill anchor holes 300 downwards in the ground foundation, then vertically insert pull-out anchors 200, and install grouting pipes 240 according to conventional methods. Grout is injected from bottom to top through the grouting pipes 240. After reaching a certain strength, pour the enlarged foundation 100. After the concrete of the enlarged foundation 100 has solidified, the enlarged foundation 100 can be stably connected to the pull-out anchors 200. Depending on the actual situation, other construction methods can also be used for the pull-out anchor 200. For example, drill anchor holes 300 downwards in the ground foundation, reserve anchor channels in the formwork of the enlarged foundation 100 (the anchor channels can be reserved by inserting PVC pipes into the formwork), and then pour the enlarged foundation 100. After the enlarged foundation 100 has solidified to a certain strength, pass the pull-out anchor 200 through the anchor channel and into the anchor hole 300 in the ground foundation. Grout is injected from bottom to top through the grouting pipe. The grout overflows from the top of the enlarged foundation 100. The grout solidifies, making the pull-out anchor fixed together with the ground foundation and the enlarged foundation 100.

[0029] Preferably, this embodiment provides a more specific pull-out anchor 200, which includes a pull-out anchor body 210, an anchor plate 230, and a nut 220. The middle and lower parts of the pull-out anchor body 210 extend into the ground foundation and are fixed together with it, while the upper part is fixed to the enlarged foundation 100. The anchor plate 230 has a through hole and passes through the pull-out anchor body 210 to abut against the top surface of the enlarged foundation 100. The nut 220 can be screwed into the pull-out anchor body 210 and abut against the top surface of the anchor plate 230. By providing the nut 220 and the anchor plate 230, the pull-out resistance of the enlarged foundation 100 can be further enhanced. The pull-out anchor body 210 is generally supported by steel bars and has threads at least at the top. The anchor plate 230 is made of steel plate with a thickness of less than 15mm.

[0030] Preferably, combined with Figure 4 As shown, to further enhance the compressive strength of the expanded foundation 100, a reinforcing steel structure 110 is pre-embedded within the expanded foundation 100 near its top surface and close to the pull-out anchor body 210, i.e., the reinforcing steel structure 110 is provided below the anchor plate 230. More preferably, the reinforcing steel structure 110 includes at least two reinforcing bars, symmetrically arranged on both sides of the pull-out anchor 200. More reinforcing bars can be provided according to the actual situation, combined with... Figure 4 As shown in the illustration, this embodiment illustrates 4 steel bars.

[0031] Preferably, the pull-out anchor 200 is fixed to the ground foundation through an anchor body. Preferably, in this embodiment, M40 cement mortar is used as the anchor body. M40 cement mortar has strong bonding force, which can stably bond the concrete and the pull-out anchor 200 together, improving the stability of the bond between the pull-out anchor 200 and the ground foundation, and thus better improving its pull-out resistance.

[0032] Preferably, at least six pull-out anchors 200 are provided, arranged symmetrically with respect to the centerline of the width direction of the enlarged foundation 100, combined with... Figure 3 As shown in the figure, this embodiment illustrates 8 pull-out anchor rods 200, which are arranged symmetrically with respect to the center line of the width direction of the enlarged foundation 100, and are mainly concentrated on both sides of the arch rib support column 400 on the enlarged foundation 100.

[0033] Preferably, to better ensure the pull-out resistance of the anti-pull-out anchor 200, the depth of the anti-pull-out anchor 200 inserted into the ground foundation is not less than 10m.

[0034] Preferably, the thickness of the enlarged foundation 100 is not less than 0.8m, the width is not less than 4m, and the length is not less than 8m. In this embodiment, the enlarged foundation 100 is selected with dimensions of 4.8m*10m*1m.

[0035] Based on the aforementioned preferred self-anchored arch rib support foundation, the construction method for the pull-out anchor 200 can be as follows: First, drill anchor holes 300 downwards in the ground foundation, then vertically insert the pull-out anchor 200, and install the grouting pipe 240 according to conventional methods. Grout is injected from bottom to top through the grouting pipe 240. After reaching a certain strength, the enlarged foundation 100 is poured. A reinforcing steel structure 110 is pre-embedded in the enlarged foundation 100 near its top surface and close to the pull-out anchor 200. After the concrete of the enlarged foundation 100 has solidified, the anchor plate 230 is inserted from the top of the pull-out anchor 200, and finally the nut 220 is screwed in until the nut 220 abuts against the top surface of the enlarged foundation 100 and the anchor plate 230 abuts against the top surface of the enlarged foundation 100. Depending on the actual situation, other construction methods can also be used for the pull-out anchor 200. For example, drill anchor holes 300 downwards in the ground foundation, reserve anchor channels in the template of the enlarged foundation 100 (the anchor channels can be reserved by inserting PVC pipes into the template), and then pour the enlarged foundation 100. Embed reinforcing steel structures 110 in the enlarged foundation 100 near its top surface and close to the anchor channels. After the enlarged foundation 100 has reached a certain strength, pass the pull-out anchor 200 through the anchor channels and into the anchor holes 300 in the ground foundation. Grout is injected from bottom to top through the grouting pipe 240. The grout overflows from the top of the enlarged foundation 100 and solidifies the pull-out anchor 200 together with the ground foundation and the enlarged foundation 100. Then, insert the anchor plate 230 from the top of the pull-out anchor 200, and finally screw in the nut 220 to hold the top surface of the anchor plate 230 against the top surface of the enlarged foundation 100.

[0036] In practical applications, after the construction of the self-anchored arch rib support foundation, the arch rib support is installed on the self-anchored arch rib support foundation. The arch rib support column 400 is fixed together with the embedded part at the top of the enlarged foundation 100. After the arch rib support is installed, one end of the guy rope is connected to the top side of the arch rib support column 400, and the other end is anchored to the adjacent arch rib support foundation. If there are two arch rib support columns 400 on one side of the arch rib support, then two sets of guy ropes are matched. By tensioning the guy ropes, wind loads can be resisted, and horizontal forces generated during the installation of the arch rib segments can also be resisted.

Claims

1. A self-anchored arch rib support foundation, characterized in that... include: The anti-pull-out anchor bolts are multiple in number, with the middle and lower parts extending into the ground foundation and being fixed together with the ground foundation; An enlarged foundation is fixed to the upper part of the pull-out anchor, and its top surface is lower than the top of the pull-out anchor.

2. The self-anchored arch rib support foundation according to claim 1, characterized in that: The pull-out anchor includes a pull-out anchor body, an anchor plate, and a nut. The middle and lower parts of the pull-out anchor body extend into the ground foundation and are fixed together with the ground foundation. The upper part is fixed to the enlarged foundation. The anchor plate has a through hole and can be matched to pass through the pull-out anchor body and abut against the top surface of the enlarged foundation. The nut can be matched to screw into the pull-out anchor body and abut against the top surface of the anchor plate.

3. The self-anchored arch rib support foundation according to claim 2, characterized in that: A reinforcing steel structure is pre-embedded within the enlarged foundation, near its top surface and close to the pull-out anchor body.

4. The self-anchored arch rib support foundation according to claim 3, characterized in that: The reinforced steel structure includes at least two reinforcing bars.

5. The self-anchored arch rib support foundation according to claim 1, characterized in that: The pull-out anchor is fixed to the ground foundation by the anchor body.

6. The self-anchored arch rib support foundation according to claim 5, characterized in that: The anchor body is M40 cement mortar.

7. The self-anchored arch rib support foundation according to claim 1, characterized in that: At least six anti-pull-out anchors are provided, arranged symmetrically with respect to the centerline of the widened foundation.

8. The self-anchored arch rib support foundation according to any one of claims 1-7, characterized in that: The depth to which the pull-out anchor is inserted into the ground foundation shall not be less than 10m.

9. The self-anchored arch rib support foundation according to any one of claims 1-7, characterized in that: The thickness of the enlarged foundation shall not be less than 0.8m.

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