Steel anchor pipe anchoring system and installation method thereof

Abstract

The present invention discloses a steel anchor pipe anchoring system and an installation method thereof, which belong to the technical field of suspension bridge devices; the structure includes an anchor pier supported by concrete, a steel anchor pipe is fixedly arranged in the anchor pier, the steel anchor pipe is arranged in the anchor pier through an anchoring structure, an anchor head structure is arranged on the outside of the anchor pier, the anchor head structure includes a tensioning connecting plate and an anchor head arranged at the tensioning end of the steel anchor pipe, and the tensioning connecting plate and the anchor head are connected and assembled by an anchoring rod; the present invention utilizes the design of the steel anchor pipe as a hollow structure to effectively solve the problems of low heat treatment efficiency and poor effect in the heat treatment process of traditional solid steel rod structures, based on the design of this structure, the steel anchor pipe can obtain higher heat treatment efficiency and better heat treatment effect while ensuring that the overall structural strength meets the requirements.

Description

Technical Field

[0001] The invention relates to a steel anchor pipe anchoring system and an installation method thereof, belonging to the technical field of suspension bridge devices. Background Art

[0002] The anchor system in a suspension bridge anchorage is the primary force-bearing and force-transmitting component of the anchorage. Its structural forms primarily include section steel anchorage systems and prestressed anchorage systems. In recent years, the rigid tie-rod anchor system has evolved from these two anchoring systems. This anchor system offers easy installation and positioning, a clearer structure with a clear force distribution, and improved corrosion resistance. It combines the advantages of both section steel anchorage systems and prestressed anchorage systems, while also making maintenance more convenient.

[0003] The rigid tie rod anchoring system mainly consists of the front anchor surface steel plate, the rear anchor surface steel plate, the rigid tie rod, nuts, washers and hot-cast anchors. The main cable and the rigid tie rod are connected by internal and external threaded connecting sleeves. The rear end of the rigid tie rod is anchored on the rear anchor surface anchor steel plate. The main cable tension is transmitted to the anchor block concrete through the rigid tie rod and the rear anchor surface steel plate.

[0004] As my country strides towards becoming a strong transportation country, more large-span bridges will appear, and the corresponding rigid tie rods will also be required to have larger and higher diameters and load-bearing capacities.

[0005] Currently, rigid tie rods are mostly made of solid steel bars, and are designed with alloy steel materials with good hardenability, such as 40CrNiMoA and 42CrMo. However, as the diameter of the steel bar increases, heat treatment becomes increasingly difficult, the performance of the rod core is difficult to guarantee, the corresponding production cost also increases exponentially, and there is also the risk of material scrapping. Summary of the Invention

[0006] The purpose of the present invention is to provide a steel anchor pipe anchoring system to address the above-mentioned problems, which uses a hollow structure to facilitate heat treatment to ensure that the rigid pull rod in the application of the anchoring system can ensure the original technical effect, especially on the basis of a large-diameter rigid pull rod, to obtain better performance processing and thus better performance.

[0007] The technical solution adopted in the present invention is as follows:

[0008] A steel anchor pipe anchoring system includes an anchor pier supported by concrete, a steel anchor pipe fixedly arranged in the anchor pier, the steel anchor pipe being arranged in the anchor pier via an anchoring structure, an anchor head structure being arranged outside the anchor pier, the anchor head structure including a tensioning connecting plate arranged on the steel anchor pipe and an anchor head, the tensioning connecting plate and the anchor head being connected and assembled via an anchoring rod;

[0009] The steel anchor pipe and / or anchoring rod adopts a hollow tube structure.

[0010] Furthermore, the anchoring structure includes a rear anchor plate fixedly arranged inside the anchor pier and a front anchor plate arranged on the end face of the anchor pier where the anchor head structure is located, and both ends of the steel anchor pipe pass through the rear anchor plate and the front anchor plate respectively.

[0011] Furthermore, an anchor nut is provided at one end of the steel anchor tube located at the rear anchor plate, and the steel anchor tube is axially limited by the cooperation between the anchor nut and the rear anchor plate. An anchor nut is also provided at the other end of the steel anchor tube, and the anchor nut is located on the outside of the tensioning connecting plate and cooperates with the tensioning connecting plate.

[0012] Furthermore, a support tube assembly is provided between the front anchor plate and the tension connection plate.

[0013] Furthermore, a pre-buried pipe is provided between the front anchor plate and the rear anchor plate, and the steel anchor pipe is provided in the pre-buried pipe.

[0014] Furthermore, spiral ribs are provided on the outer side of the embedded pipe.

[0015] Furthermore, sealing covers are provided at both ends of the steel anchor pipe, and the sealing covers are respectively fixed to the rear anchor plate and the tension connection plate. A closed cavity is formed between the sealing cover, the rear anchor plate, the embedded pipe, the front anchor plate, the support tube assembly, the tension connection plate and the steel anchor pipe, and the cavity is filled with concrete.

[0016] The sealing cover located at the rear anchor plate is connected with a grouting connection pipe, and the sealing plate located at the tension connection plate is connected with an observation pipe opening.

[0017] Furthermore, the outer side of the steel anchor pipe is covered with a smooth rubber layer, and a rough coating layer is provided on the outer side of the rubber layer.

[0018] Furthermore, the steel anchor pipe and / or anchor rod comprises at least one section;

[0019] When the steel anchor pipe and / or anchor rod consists of two or more sections, each section is assembled and connected using a connector assembly.

[0020] Furthermore, the diameter of the steel anchor pipe and / or anchor rod is not less than 120 mm.

[0021] Furthermore, the steel anchor pipe and / or anchor rod includes a tube body, and a solid auxiliary rod is also arranged inside the tube body. The auxiliary rod passes through the tube body and extends out of the end of the tube body. Fastening nuts are provided at both ends of the auxiliary rod. The fastening nuts are respectively matched with the two end surfaces of the tube body. Anchor nuts are provided at both ends of the tube body and respectively cooperate with the rear anchor plate and the tensioning connection plate.

[0022] A method for installing an anchoring system comprises the following steps:

[0023] a. Obtain the cross-sectional area of ​​the steel anchor pipe according to the controlled stress, and thus obtain the diameter of the steel anchor pipe. Design the hollow structure according to the actual diameter. The side wall thickness of the steel anchor pipe is required to be no more than 100mm. The steel anchor pipe is pre-treated and then formed after heat treatment.

[0024] b. Install the formed steel anchor pipe into the prefabricated embedded steel pipe. Use anchor nuts to assemble the front anchor plate and rear anchor plate at both ends of the embedded steel pipe. Install a sealing cover at the rear anchor plate position and connect it to the grouting connection pipe.

[0025] c. Set spiral reinforcement on the outer sides of both ends of the embedded steel pipe, put the embedded steel pipe with steel anchor pipe into the casting mold, pour concrete, and wait for it to cool and form into an anchor pier;

[0026] d. After the anchor pier is formed, a tensioning connecting plate is assembled on the front end of the steel anchor pipe, an anchor rod is assembled on the tensioning connecting plate, an anchor head is assembled on the front end of the anchor rod, a sealing cover is assembled on the front end of the steel anchor pipe located at the tensioning connecting plate, and an observation nozzle is connected;

[0027] e. Use equipment to prestress the steel anchor pipe so that it is in an elongated state, and assemble the support tube assembly between the tensioning connection plate and the front anchor plate. Connect the anchor head to the suspension cable to apply downward tension to the suspension cable.

[0028] f. Inject concrete through the grouting connection pipe so that the concrete fills the entire cavity, and observe whether the grouting is in place through the observation pipe mouth. Once in place, block the observation pipe mouth.

[0029] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0030] The steel anchor pipe anchoring system and installation method of the present invention effectively solve the problem of low heat treatment efficiency of traditional solid steel tie rod structures in structural design. As the span of the suspension bridge becomes larger, the diameter of the tie rod in the anchoring system also becomes larger, and it takes a longer time to ensure that the tie rod maintains the performance of the original tie rod. Even in terms of its heat treatment effect, the heat treatment effect of the tie rod shaft position is not good. In the design of this design, the design of the tie rod as a hollow structure effectively solves the problem of poor effect of the tie rod in the heat treatment process. Based on the design of this structure, the heat treatment efficiency and effect of the tie rod can be effectively guaranteed while ensuring the cross-sectional area of ​​the entire structure, and the heat treatment effect of the tie rod with a smaller diameter can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 It is a structural diagram of the steel anchor pipe / anchor rod of the present invention;

[0033] Figure 3 This is one of the structural diagrams of Example 2 of the present invention;

[0034] Figure 4 This is the second structural diagram of embodiment 2 of the present invention;

[0035] Figure 5 is a schematic cross-sectional view of the steel anchor pipe / anchor rod of the present invention;

[0036] Figure 6 It is a front view of the steel anchor pipe / anchor rod of the present invention.

[0037] Markings in the figure: 1-anchor pier, 2-steel anchor pipe, 3-tensioning connecting plate, 4-anchor head, 5-anchor rod, 6-front anchor plate, 7-rear anchor plate, 8-anchor nut, 9-support tube assembly, 10-embedded steel pipe, 11-spiral reinforcement, 12-sealing cover, 13-grouting connecting pipe, 14-observation pipe mouth, 15-rubber layer, 16-coating layer, 17-connector assembly, 18-auxiliary pull rod, 19-fastening nut. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings.

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Example 1

[0041] A steel anchor pipe 2 anchoring system, such as Figures 1 to 6 As shown, it includes an anchor pier 1 supported by concrete, a steel anchor pipe 2 is fixedly installed in the anchor pier 1, and the steel anchor pipe 2 is installed in the anchor pier 1 through an anchoring structure. An anchor head 4 structure is provided on the outside of the anchor pier 1, and the anchor head 4 structure includes a tensioning connecting plate 3 and an anchor head 4 provided on the steel anchor pipe 2. The tensioning connecting plate 3 and the anchor head 4 are connected and assembled by an anchor rod 5;

[0042] The steel anchor pipe 2 and / or the anchoring rod 5 adopt a hollow tube structure.

[0043] In this embodiment, the steel anchor tube 2 and / or anchor rod 5 utilize a hollow tubular structure, with a diameter D of no less than 120 mm. Based on this design concept, and as a more specific description, in conventional suspension bridge technology, the diameter of the steel anchor tube 2 is relatively low. At this diameter, the rod can be effectively heat-treated using standard metal heat treatment processes. However, as areas with relatively easy construction access continue to decrease, requirements for suspension bridge spans and other factors are gradually increasing, and the resulting rod diameters are also increasing. However, rods with a certain diameter exhibit relatively poor heat treatment performance. To ensure uniform heating throughout the rod during the heat treatment process and maintain relatively stable performance, a hollow structure is employed. Furthermore, in actual designs, the rod is typically prestressed with a relatively high stress before anchoring the suspension cable. Since stress is primarily related to its cross-sectional area, the cross-sectional area of ​​the rod must be considered when designing a hollow structure.

[0044] Further explanation: Traditional technology also involves the use of a hollow structure in the main pull rod design, such as CN214882965U. The disclosed technical features also include a hollow structure design, but the specific structural design is for threading the rope. Therefore, as a specific structural design, it is an axial through-hole, not a control structure. As technical problems arise, in order to solve the substantive technical problems, the control structure is utilized to ensure the cross-sectional area, thereby effectively ensuring the heat treatment efficiency and stability of the pull cylinder.

[0045] Based on the above-mentioned specific structural design, as a more specific design, the anchor structure includes a rear anchor plate 7 fixedly installed inside the anchor pier 1 and a front anchor plate 6 installed on the end face of the anchor pier 1 where the anchor head 4 structure is located. The two ends of the steel anchor pipe 2 respectively pass through the rear anchor plate 7 and the front anchor plate 6. In this structural design, the steel anchor pipe 2 can be better fixed in the anchor pier 1.

[0046] Based on the above specific design, a further design is provided in which an anchor nut 8 is provided at one end of the steel anchor pipe 2 located on the rear anchor plate 7. The anchor nut 8 cooperates with the rear anchor plate 7 to limit the axial position of the steel anchor pipe 2. An anchor nut 8 is also provided at the other end of the steel anchor pipe 2. The anchor nut 8 is located outside the tensioning connecting plate 3 and cooperates with the tensioning connecting plate 3. In this structural design, the entire anchoring system is formed into an integrated whole.

[0047] In order to realize a sealed cavity, a support cylinder assembly 9 is provided between the front anchor plate and the tension connection plate 3. The assembly can cover and seal the exposed steel rod.

[0048] Based on the above-mentioned specific structural design, as a more specific design, a pre-buried pipe is further provided between the front anchor plate 6 and the rear anchor plate 7. The steel anchor pipe 2 is disposed within the pre-buried pipe. To enhance stability, spiral ribs 11 are also provided on the outside of the pre-buried pipe. This structural design effectively ensures the ductility of the steel anchor pipe 2 under load, and prevents it from being difficult to expand or contract under the action of the large anchor pier 1.

[0049] On the basis of the design of the above specific structure, as a further design, sealing covers 12 are further provided at both ends of the steel anchor pipe 2. The sealing covers 12 are respectively fixed on the rear anchor plate 7 and the tension connection plate 3. A closed cavity is formed between the sealing cover 12, the rear anchor plate 7, the embedded pipe, the front anchor plate 6, the support cylinder assembly 9, the tension connection plate 3 and the steel anchor pipe 2, and the cavity is filled with concrete.

[0050] The sealing cover 12 located on the rear anchor plate 7 is connected to a grouting connection pipe 13 , and the sealing plate located on the tension connection plate 3 is connected to an observation pipe port 14 .

[0051] In the above specific structural design, a grouting cavity is realized by the structural design, which is also conducive to the adjustment of the steel anchor pipe 2. More importantly, when in use, the rear anchor plate 7 is located at the bottom and the tension connection plate 3 is located at the top. In order to facilitate the observation of whether the grouting is in place, the method adopted is also to grout from the bottom, and the overflow from the top indicates that the grouting is complete.

[0052] On the one hand, the function of the steel anchor pipe 2 must be ensured, and on the other hand, the effect of being stretched or contracted up and down must be ensured. In the specific design, the outer side of the steel anchor pipe 2 is covered with a smooth rubber layer 15, and a coating layer 16 is provided on the outer side of the rubber layer 15.

[0053] In this design, the covering layer 16 can be made of fiber cloth. With the help of the smoothness of the rubber coating layer 15, it effectively provides stability while ensuring that the elongation or shortening of the steel anchor pipe 2 is not affected under the action of tension.

[0054] As a further optimized design, the steel anchor pipe 2 and / or the anchoring rod 5 includes at least one section;

[0055] When the steel anchor pipe 2 and / or the anchoring rod 5 is composed of two or more sections, each section is assembled and connected using a connector assembly 17 .

[0056] In this embodiment, the main hollow tube structure is the steel anchor pipe 2, which is also the main pull rod. In this embodiment, a more specific design, as an optimized design, the steel anchor pipe 2 is divided into two sections and is assembled and connected using a connector assembly 17.

[0057] Example 2

[0058] On the basis of the design of Example 1, based on the design of the steel anchor pipe 2 with an excessively large diameter, as an auxiliary design, the steel anchor pipe 2 and / or the anchor rod 5 includes a tube body, and a solid auxiliary rod 18 is further provided inside the tube body. The auxiliary rod 18 passes through the tube body and extends out of the end of the tube body. Fastening nuts 19 are provided at both ends of the auxiliary rod 18, and the fastening nuts 19 are respectively matched with the two end surfaces of the tube body. Anchor nuts 8 are provided at both ends of the tube body, and respectively cooperate with the rear anchor plate 7 and the tensioning connecting plate 3.

[0059] Example 3

[0060] Based on Examples 1 and 2, in terms of specific design, if it is a normal direct tension, the requirements are relatively low. However, as an application in a suspension bridge, the components of the anchor pier are mainly subjected to pressure, and this pressure is brought by the steel anchor pipe. So, as a design condition in this case, why is it pressure rather than an upward lifting force? This is still due to the construction and installation method. As a clear and prominent explanation, it is the role of pressure. In order to ensure safety and stability, as well as the service life of the anchor pier, there is a certain relationship between this and the cross-section of the steel anchor pipe. While ensuring the same cross-sectional area, the performance stability of the steel anchor pipe must also be considered. Therefore, an installation method of the anchor system is proposed, including the following steps:

[0061] a. Obtain the cross-sectional area of ​​the steel anchor pipe according to the controlled stress, and thus obtain the diameter of the steel anchor pipe. Design the hollow structure according to the actual diameter. The side wall thickness of the steel anchor pipe is required to be no more than 100mm. The steel anchor pipe is pre-treated and then formed after heat treatment.

[0062] b. Install the formed steel anchor pipe into the prefabricated embedded steel pipe. Use anchor nuts to assemble the front anchor plate and rear anchor plate at both ends of the embedded steel pipe. Install a sealing cover at the rear anchor plate position and connect it to the grouting connection pipe.

[0063] c. Set spiral reinforcement on the outer sides of both ends of the embedded steel pipe, put the embedded steel pipe with steel anchor pipe into the casting mold, pour concrete, and wait for it to cool and form into an anchor pier;

[0064] d. After the anchor pier is formed, a tensioning connecting plate is assembled on the front end of the steel anchor pipe, an anchor rod is assembled on the tensioning connecting plate, an anchor head is assembled on the front end of the anchor rod, a sealing cover is assembled on the front end of the steel anchor pipe located at the tensioning connecting plate, and an observation nozzle is connected;

[0065] e. Use equipment to prestress the steel anchor pipe so that it is in an elongated state, and assemble the support tube assembly between the tensioning connection plate and the front anchor plate. Connect the anchor head to the suspension cable to apply downward tension to the suspension cable.

[0066] f. Inject concrete through the grouting connection pipe so that the concrete fills the entire cavity, and observe whether the grouting is in place through the observation pipe mouth. Once in place, block the observation pipe mouth.

[0067] In the above specific implementation, as a more specific explanation, the pretreatment of the steel anchor pipe is to coat the rubber layer and the coating layer.

[0068] In step a above, the cross-section is calculated as: stress = force / area. In the field of large suspension bridges, relevant data must be collected in advance. To ensure safety, the area is usually increased as the difficulty coefficient increases.

[0069] As a practical application, according to the current span of 1,560 meters of the Longtan Bridge, in future suspension bridges, the number of river crossings of 2,000 meters and above will continue to increase, and the requirements for steel tie rods will become increasingly higher. For example, if a steel tie rod with a diameter of 200mm is used, but the heat treatment quenching thickness is less than 100mm, the middle position of the steel tie rod cannot achieve the desired effect of heat treatment.

[0070] To sum up, the steel anchor pipe anchoring system and installation method of the present invention effectively solve the problem of low heat treatment efficiency of traditional tie rod structures in structural design. As the span of the suspension bridge becomes larger, the diameter of the tie rod in the anchoring system also becomes larger, and it takes a longer time to ensure that the tie rod maintains the performance of the original tie rod. Even in terms of the effect of its heat treatment, the heat treatment effect of the tie rod shaft position is not good. In the design of this design, the design of the tie rod as a hollow structure effectively solves the problem of poor effect of the tie rod in the heat treatment process. Based on the design of this structure, the heat treatment efficiency and effect of the tie rod can be effectively guaranteed while ensuring the cross-sectional area of ​​the entire structure, and the heat treatment effect of the tie rod with a smaller diameter can be obtained.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A steel anchor pipe anchoring system, characterized by: The invention comprises an anchor pier (1) supported by concrete, wherein a steel anchor pipe (2) is fixedly arranged in the anchor pier (1), the steel anchor pipe (2) is arranged in the anchor pier (1) through an anchoring structure, an anchor head (4) structure is arranged outside the anchor pier (1), the anchor head (4) structure comprises a tensioning connecting plate (3) arranged on the steel anchor pipe (2) and an anchor head (4), and the tensioning connecting plate (3) and the anchor head (4) are connected and assembled by an anchoring rod (5); The steel anchor pipe (2) and / or the anchoring rod (5) adopt a hollow tube structure; The anchoring structure comprises a rear anchor plate (7) fixedly arranged inside the anchor pier (1) and a front anchor plate (6) arranged on the end face of the anchor pier (1) where the anchor head (4) structure is located, and both ends of the steel anchor pipe respectively penetrate the rear anchor plate (7) and the front anchor plate (6); The steel anchor pipe (2) is provided with an anchor nut (8) at one end thereof, which is located at the rear anchor plate (7). The steel anchor pipe (2) is axially limited by the cooperation between the anchor nut (8) and the rear anchor plate (7). The other end of the steel anchor pipe (2) is also provided with an anchor nut (8). The anchor nut (8) is located outside the tensioning connecting plate (3) and cooperates with the tensioning connecting plate (3). A support cylinder assembly (9) is also provided between the front anchor plate (6) and the tensioning connecting plate (3). A pre-buried pipe is further provided between the front anchor plate (6) and the rear anchor plate (7), and the steel anchor pipe (2) is provided in the pre-buried pipe; The outer side of the embedded pipe is further provided with a spiral rib (11); Sealing covers (12) are also provided at both ends of the steel anchor pipe (2), and the sealing covers (12) are respectively fixed on the rear anchor plate (7) and the tension connection plate (3). A closed cavity is formed between the sealing cover (12), the rear anchor plate (7), the embedded pipe, the front anchor plate (6), the support tube assembly (9), the tension connection plate (3) and the steel anchor pipe (2), and the cavity is filled with concrete. The sealing cover (12) located at the rear anchor plate (7) is connected to a grouting connection pipe (13), and the sealing plate located at the tension connection plate (3) is connected to an observation pipe port (14); The steel anchor pipe (2) and / or anchoring rod (5) comprises a tube body, and a solid auxiliary rod (18) is also provided inside the tube body. The auxiliary rod (18) passes through the tube body and extends out of the end of the tube body. Fastening nuts (19) are provided at both ends of the auxiliary rod (18). The fastening nuts (19) respectively cooperate with the two end surfaces of the tube body. Anchoring nuts (8) are provided at both ends of the tube body and respectively cooperate with the rear anchor plate (7) and the tensioning connecting plate (3).

2. A steel anchor pipe anchoring system according to claim 1, characterized in that: The outer side of the steel anchor pipe (2) is covered with a smooth rubber coating layer (15), and a rough coating layer (16) is provided on the outer side of the rubber coating layer (15).

3. The steel anchor pipe anchoring system according to claim 1, characterized in that: The steel anchor pipe (2) and / or the anchoring rod (5) comprises at least one section; When the steel anchor pipe (2) and / or the anchoring rod (5) are in two or more sections, each section is assembled and connected using a connector assembly (17).

4. The steel anchor pipe anchoring system according to claim 1, characterized in that: The diameter of the steel anchor pipe (2) and / or the anchoring rod (5) is not less than 120 mm.

5. An anchoring system installation method for installing a steel anchor pipe anchoring system according to any one of claims 1 to 4, characterized in that: The following steps are involved: a. Obtain the cross-sectional area of ​​the steel anchor pipe according to the controlled stress, and thus obtain the diameter of the steel anchor pipe. Design the hollow structure according to the actual diameter. The side wall thickness of the steel anchor pipe is required to be no more than 100mm. The steel anchor pipe is pre-treated and then formed after heat treatment. b. Install the formed steel anchor pipe into the prefabricated embedded steel pipe. Use anchor nuts to assemble the front anchor plate and rear anchor plate at both ends of the embedded steel pipe. Install a sealing cover at the rear anchor plate position and connect it to the grouting connection pipe. c. Set spiral reinforcement on the outer sides of both ends of the embedded steel pipe, put the embedded steel pipe with steel anchor pipe into the casting mold, pour concrete, and wait for it to cool and form into an anchor pier; d. After the anchor pier is formed, a tensioning connecting plate is assembled on the front end of the steel anchor pipe, an anchor rod is assembled on the tensioning connecting plate, an anchor head is assembled on the front end of the anchor rod, a sealing cover is assembled on the front end of the steel anchor pipe located at the tensioning connecting plate, and an observation nozzle is connected; e. Use equipment to prestress the steel anchor pipe so that it is in an elongated state, and assemble the support tube assembly between the tensioning connection plate and the front anchor plate. Connect the anchor head to the suspension cable to apply downward tension to the suspension cable. f. Inject concrete through the grouting connection pipe so that the concrete fills the entire cavity, and observe whether the grouting is in place through the observation pipe mouth. Once in place, block the observation pipe mouth.

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