A device and method for reinforcing reinforced concrete beams in external prestressing for port construction

Abstract

The present invention discloses an external prestressed reinforcement device for reinforced concrete beams for port construction, comprising two prestressed reinforcement units symmetrically arranged on two beam walls of the reinforced concrete beam, wherein the prestressed reinforcement units comprise two anchor blocks, at least one supporting block, two anchors and at least one steel strand. The present invention also discloses a reinforcement method for reinforced concrete beam structures for port construction, comprising the following steps: step 1) forming holes in the beam body, step 2) casting anchor blocks, step 3) casting supporting blocks, step 4) installing anchors, step 5) unloading steel strands, step 6) installing jacks, step 7) prestressing steel strands, step 8) chiseling out concrete at the bottom of the beam and removing the original corroded main bars, and step 9) increasing the cross-section of the bottom of the beam for reinforcement. Advantages: The present invention has an obvious effect of improving the stiffness and bearing capacity of reinforced concrete beam structures, is relatively convenient to construct and operate, and has controllable quality, and can be widely used in various reinforcement and reconstruction projects for reinforced concrete beam structures for port construction.

Description

Technical Field

[0001] The invention relates to the technical field of port construction structural engineering reinforcement, and in particular to an external prestressed reinforcement device and a reinforcement method for a port construction reinforced concrete beam. Background Art

[0002] As the use time of the seaport dock increases, the dock structure is eroded by seawater for a long time, and the concrete will be carbonized and chloride ions will increase, resulting in reduced durability of the dock structure. In particular, the bottom of the beam is located in the splash zone, which is very prone to concrete cracks and steel corrosion, thereby reducing the structural bearing capacity. Reinforcement measures are needed. At present, the main structural reinforcement methods for reinforced concrete beams include increasing the cross-section reinforcement method, bonding steel plates, bonding carbon fiber reinforcement method, prestressed reinforcement method, etc., each method has its own advantages and disadvantages.

[0003] The method of increasing the cross-section reinforcement increases the deadweight and cross-section size of the structure itself, but while improving the bearing capacity of reinforced concrete beams, it may also change the stiffness distribution of the structure itself, causing chain reinforcement of other adjacent components, and permanent loads during the construction period may cause new damage to the original structure.

[0004] The steel plate reinforcement method uses a special structural adhesive to stick the steel plate to the surface of the reinforced concrete beam. It can achieve the purpose of reinforcing and enhancing the strength and rigidity of the original beam, and can solve the shear and torsional strength problems at the same time. However, the steel plate still has a certain weight, which will increase the permanent load of the original structure during the construction period.

[0005] The carbon fiber bonding reinforcement method uses carbon fibers instead of steel plates to bond them to beams. It is more economical than bonding steel plates, has light material weight, simple construction, and fast construction speed. It has a good effect on the bending and shear reinforcement of the original structure, but it only improves the stiffness of the original structure very little, and there is little research in China on the reliability of improving torsional bearing capacity.

[0006] The prestressed reinforcement method can significantly improve the bearing capacity of the structure, but the construction is complicated and the improvement in structural stiffness is relatively small.

[0007] It can be seen that the current traditional reinforcement methods all have certain defects to varying degrees, and a single reinforcement method is difficult to meet the requirements for the safe use of port engineering structures. Summary of the invention

[0008] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art and to provide a structural reinforcement method for improving the rigidity and bearing capacity of reinforced concrete beams for port construction by combining external prestressing and increasing the cross-section.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0010] An external prestressed reinforcement device for reinforced concrete beams of a port project comprises two prestressed reinforcement units symmetrically arranged on two beam walls of the reinforced concrete beam.

[0011] The prestressed reinforcement unit comprises two anchor blocks, at least one support block, two anchors and at least one steel strand.

[0012] The two anchor blocks are arranged at both ends of the reinforced area of ​​the beam wall of the reinforced concrete beam, and all the support blocks are evenly spaced between the two anchor blocks and arranged on the beam wall of the reinforced concrete beam; the two anchor blocks and all the support blocks are tightly fixed to the beam wall of the reinforced concrete beam to ensure the rigidity and bearing capacity of the anchor blocks and the support blocks;

[0013] The steel strand is passed through two anchor blocks and all supporting blocks. Two anchors are respectively arranged on the outer end faces of the two anchor blocks. Both ends of the steel strand pass through the two anchors. The steel strand is pre-tensioned by means of additional jacks on both anchors.

[0014] The jack of the technical solution of the present invention is fixedly installed on the anchor, and the jack is fastened to the anchor through the tool anchor; the output end of the jack can drive the anchor to apply prestress to the steel strand. The jack and anchor in the technical solution of the present invention are common knowledge in the technical field, and the jack and anchor are purchased parts directly.

[0015] The concrete of the technical solution of the present invention adopts grouting material and fine stone concrete, and the steel strand adopts single-layer non-bonded epoxy sprayed steel strand.

[0016] Preferably, the two anchor blocks and all the support blocks are embedded with PVC sleeves for the steel strands to pass through.

[0017] Preferably, the anchor block and the support block are both made by casting grouting material.

[0018] In a preferred embodiment of the technical solution of the present invention, the PVC sleeve is pre-buried in the anchor block and the support block.

[0019] Preferably, anchor pads are embedded in the outer end faces of the two anchor blocks, and the two anchors are connected to the two anchor pads respectively.

[0020] In the preferred embodiment of the technical solution of the present invention, a pair of holes are punched on the beam body of a reinforced concrete beam using a coring machine, and the perforated holes are cast to form anchor blocks and support block nodes, with one part of the anchor block and the support block located inside the hole and the other part located outside the hole. The anchor blocks and support blocks of the technical solution of the present invention are cast with reinforced concrete, and are connected to the beam through the perforated holes opened on the side of the beam wall to form an integral structure.

[0021] The present invention also proposes a reinforcement method using an external prestressed reinforcement device for reinforced concrete beams of a port worker, characterized in that it comprises the following steps:

[0022] Step 1) Drill holes in the beam

[0023] A plurality of evenly spaced through holes are processed on the two symmetrical beam walls of the reinforced concrete beam to be reinforced, and the concrete around the holes is roughened;

[0024] Step 2) Casting of anchor blocks

[0025] On the two symmetrical beam walls, the node anchor blocks are cast with grouting material in the two through holes at the outermost ends of the reinforcement area and maintained; one part of the anchor block is located inside the hole and the other part is located outside the hole; the anchor pad and PVC sleeve should be embedded in advance before casting the anchor block;

[0026] Step 3) Casting of support blocks

[0027] Grouting materials are used to cast support blocks in all other perforations on the two symmetrical beam walls and then maintained; one part of the support block is located inside the hole and the other part is located outside the hole; PVC casing should be pre-buried before casting the support block;

[0028] Step 4) Anchor installation

[0029] When the material strength of the anchor block in step 3 and the support block in step 4 reaches or exceeds the required strength, the anchor is installed on the anchor pad in the anchor block on the reinforced concrete beam using structural adhesive and maintained;

[0030] Step 5) Cutting the steel strands

[0031] The steel strands are inserted into the reserved holes of the anchor blocks and support blocks, and the steel strands are manually pulled. The exposed lengths of both ends of the steel strands must be consistent;

[0032] Step 6) Jack Installation

[0033] Install jacks on all anchors on the reinforced concrete beam, and insert both ends of the steel strand into the jacks; align the center of the anchor with the center of the PVC sleeve, adjust the position of the jack so that the jack, PVC sleeve and anchor are on the same axis, and make the jack and anchor contact closely;

[0034] Step 7) Prestressing of steel strands

[0035] Open all jacks and pre-tension the steel strands to make them move from a relaxed state to a stressed state, thus eliminating the measurement error of the elongation value;

[0036] After pre-tensioning, formal tensioning is carried out. Prestressing is divided into five stages: 0σcon to 0.2σcon, 0.2σcon to 0.4σcon, 0.4σcon to 0.6σcon, 0.6σcon to 0.8σcon, and 0.8σcon to 1.0σcon. σcon represents the tension control stress. After each loading stage, let it stand for 1-2 minutes. After the deformation of the steel strand is stable, tensioning is carried out again. After reaching the tension control stress, the jack is removed.

[0037] Step 8) Remove the concrete at the bottom of the beam and the original corroded main reinforcement

[0038] After the reinforced concrete beam is reinforced with external prestressing, the deteriorated concrete at the bottom of the beam is removed by electric hammer and manual chiseling to 20-30mm behind the main reinforcement, cleaned to the dense part, removed the original corroded main reinforcement, and roughened the joint surface, and knocked off the edges and corners of the original beam; the steel bars and concrete surface are cleaned with high-pressure fresh water, and after cleaning the base, the cement-based migration type steel bar rust-proof coating is immediately applied twice;

[0039] Step 9) Increase the cross-section of the beam bottom for reinforcement

[0040] Based on the beam structure review calculation, determine the increased cross-sectional size of the reinforced concrete beam and the number of reinforcing steel bars.

[0041] As an improvement to the technical solution of the present invention, in step 1, the hole spacing between each two adjacent pairs of through holes is equal, and the adjacent hole spacing is approximately twice the beam height.

[0042] An improvement on the technical solution of the present invention is that multiple PVC sleeves can be pre-buried in one anchor block and one support block in step 2 and step 3, the number of PVC sleeves pre-buried in one anchor block and one support block is equal, and the number of PVC sleeves pre-buried in one anchor block and one support block is equal to the number of steel wire ropes.

[0043] The improvement of the technical solution of the present invention is that in step 9, reinforcement is planted on the beam wall of the reinforced concrete beam, and a certain thickness of reinforced concrete material is added to the lower part of the reinforced concrete beam, and the newly added concrete wraps the external prestressing device. The beam is reinforced by increasing the cross section, and the unbonded steel strand is wrapped therein, which effectively solves the anti-corrosion problem of the unbonded steel strand.

[0044] This reinforcement method combines the external prestressed reinforcement technology with the cross-section enlargement reinforcement technology, which can give full play to the advantages of both. It can not only improve the structural stress conditions of the beam and increase safety during the construction period, but also improve the stiffness and bearing capacity of the beam structure at the same time.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. The present invention applies external prestress to the damaged reinforced concrete beam first. On the one hand, the beam structure has a certain degree of "upward arch" effect, which improves the stress state of the beam structure and has a certain degree of closing effect on the concrete cracks at the bottom of the beam structure; on the other hand, it can increase the bearing capacity of the damaged reinforced concrete beam and effectively solve the safety problem during the reinforcement construction period of the reinforced concrete beam.

[0047] 2. The present invention combines the external prestressing reinforcement technology with the cross-section enlargement reinforcement technology, which can give full play to the advantages of both, and can not only improve the structural stress conditions of the beam, increase safety during the construction period, but also improve the stiffness and bearing capacity of the beam structure at the same time.

[0048] 3. The present invention has a significant effect on improving the rigidity and bearing capacity of reinforced concrete beam structures, is convenient to construct and operate, and has controllable quality. It can be widely used in various port engineering reinforced concrete beam structure reinforcement and reconstruction projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Elevation view of the external prestressed steel strand reinforcement of the beam structure in the embodiment;

[0050] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0051] Figure 3 Plan view of external prestressed steel strand reinforcement of beam structure in the embodiment;

[0052] Figure 4 for Figure 3 A partial enlarged schematic diagram of B in the middle;

[0053] Figure 5 Cross-sectional view of the anchor block in the embodiment. DETAILED DESCRIPTION

[0054] The technical solution of the present invention is described in detail below, but the protection scope of the present invention is not limited to the embodiments.

[0055] To make the content of the present invention more clearly understood, the following Figure 1-5 The specific implementation manner is further described.

[0056] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 used to limit the present invention.

[0057] Example:

[0058] Now, taking the application of the external prestressed reinforcement device and reinforcement method of the reinforced concrete beam of a port worker proposed in the present invention in the approach bridge structure reinforcement project of Ningbo Beilun International Container Terminal Co., Ltd. as an example, the implementation steps are as follows:

[0059] See also Figure 1 to Figure 5 The invention discloses an external prestressed reinforcement device for reinforced concrete beams of port engineering. The reinforcement device comprises two prestressed reinforcement units symmetrically arranged on two beam walls of a reinforced concrete beam 1, and the prestressed reinforcement units are located at the lower position of the beam wall.

[0060] The prestressed reinforcement unit includes a steel strand 2, an anchor block 3, a supporting block 4, an anchor pad 5, an anchor 6, a jack 7 and a PVC sleeve 8. The anchor pad 5 and the PVC sleeve 8 are arranged in the anchor block 3, and the PVC sleeve 8 is arranged in the supporting block 4. The anchor block 3 and the supporting block 4 are cast with grouting material to ensure the rigidity and bearing capacity of the connecting block. The prestressed steel strand 2 adopts an unbonded prestressed steel strand to isolate the prestressed tendons from the concrete, reduce the friction loss during tensioning, and effectively prevent the prestressed tendons from being corroded.

[0061] The prestressed reinforcement units on the beam wall of the reinforced concrete beam 1 can be provided in multiples according to the requirements of the on-site construction. In this embodiment, two prestressed reinforcement units are provided on the two beam walls of the reinforced concrete beam 1. Figure 2 shown.

[0062] The number of steel strands 2 and support blocks 4 in the prestressed reinforcement unit can be set according to the on-site construction requirements. In this embodiment, there are four steel strands 2 and three support blocks 4 in each prestressed reinforcement unit. Figure 2 shown.

[0063] A reinforcement method for reinforced concrete beam structure of a port construction project, which combines external prestressing reinforcement with enlarged section reinforcement to improve the rigidity and bearing capacity of the beam structure to be reinforced. First, two or more evenly distributed prestressed steel strands 2 are fixedly installed on both sides of the beam structure 1 to be reinforced, and then the enlarged section reinforcement method is used to increase the beam section and cover the external prestressing reinforcement device. The specific steps are as follows:

[0064] Step 1) Beam body drilling: Multiple evenly spaced through holes are processed on the two symmetrical beam walls of the reinforced concrete beam 1 to be reinforced, and the concrete around the holes is roughened. The hole positions in this step can be specified in advance, and then a drilling and coring machine is used to drill holes at the specified node positions of the beam body. The hole spacing between each two adjacent through holes is equal, and the adjacent hole spacing is about twice the beam height.

[0065] Step 2) Casting of anchor blocks: Grouting is used to cast node anchor blocks 3 in two through holes at the outermost ends of the reinforcement area on two symmetrical beam walls, and curing is performed; one part of the anchor block 3 is located inside the hole and the other part is located outside the hole; before casting the anchor block 3, the anchor pad 5 and the PVC sleeve 8 should be embedded in advance.

[0066] Step 3) Casting of supporting blocks: Grouting materials are used to cast supporting blocks 4 in all other through holes on the two symmetrical beam walls, and curing is performed; a portion of the supporting block 4 is located inside the hole, and another portion is located outside the hole; PVC sleeves 8 should be pre-buried in advance before casting the supporting blocks 4. In steps 2 and 3, multiple PVC sleeves 8 can be pre-buried in one anchor block 3 and one supporting block 4, and the number of PVC sleeves 8 pre-buried in one anchor block 3 and one supporting block 4 is equal, and the number of PVC sleeves 8 pre-buried in one anchor block 3 and one supporting block 4 is equal to the number of steel strands 2.

[0067] Step 4) Anchor installation: When the material strength of the anchor block 3 in step 3 and the support block 4 in step 4 reaches or exceeds the required strength, the anchor 6 is installed on the anchor pad 5 in the anchor block 3 on the reinforced concrete beam 1 using structural adhesive and maintained.

[0068] Step 5) Cutting the steel strands: The steel strands 2 are inserted into the anchor blocks and the support blocks with the reserved PVC sleeves 8, and the steel strands 2 are manually pulled. The exposed lengths at both ends of the steel strands 2 must be consistent, and the steel strands 2 must not be twisted in an interlaced manner.

[0069] Step 6) Jack installation: Install jacks 7 on all anchors 6 on the reinforced concrete beam 1, and insert both ends of the steel strand 2 into the jacks 7; the center of the anchor 6 should be aligned with the center of the PVC sleeve 8, and the position of the jack should be adjusted so that the jack 7, the PVC sleeve 8 and the anchor 6 are on the same axis, and the jack is in close contact with the anchor.

[0070] Step 7) Prestressing the steel strand 2: Open all jacks 7 to prestress the steel strand 2, so that the steel strand 2 is in a stressed state from a relaxed state, thereby eliminating the elongation value measurement error;

[0071] After pre-tensioning, formal tensioning is carried out. The prestressing is divided into five stages: 0σcon to 0.2σcon, 0.2σcon to 0.4σcon, 0.4σcon to 0.6σcon, 0.6σcon to 0.8σcon, and 0.8σcon to 1.0σcon. σcon represents the tension control stress. After each loading stage, let it stand for 1-2 minutes. After the deformation of the steel strand 2 is stable, tensioning is carried out again. After the tension control stress is reached, the jack 7 is removed.

[0072] Step 8) Chisel out the concrete at the bottom of the beam and remove the original corroded main reinforcement: After the reinforced concrete beam 1 is reinforced with external prestressing, use an electric hammer and manual chiseling to remove the deteriorated concrete at the bottom of the beam to 20~30mm behind the main reinforcement, clean it to the dense part, remove the original corroded main reinforcement, and roughen the joint surface, and knock down the edges and corners of the original beam; use high-pressure fresh water to clean the steel bars and concrete surface, and immediately apply two coats of cement-based migration-type steel bar rust-proof coating after cleaning the base.

[0073] Step 9) Strengthen the bottom of the beam by increasing the cross section: According to the beam structure review calculation, determine the increased cross-sectional size of the reinforced concrete beam 1 and the number of reinforcing steel bars 9. Plant the steel bars at the appropriate positions on both sides of the lower part of the beam structure, and use the hanging formwork for the formwork, which is hung on the upper panel by bolts. Add a certain thickness of reinforced concrete material on the bottom and side of the beam 1 to increase the height and width of the beam section, which can effectively improve the rigidity and bearing capacity of the beam structure. The newly added concrete wraps the external prestressing device, which effectively solves the anti-corrosion problem of the prestressed steel strands; after the concrete solidifies, remove the formwork. The concrete uses self-compacting, high-performance C45 concrete.

[0074] The external prestressed reinforcement device and reinforcement method for reinforced concrete beams of the present embodiment improves the stress state of the beam structure after prestressing the steel strand 2, and the beam 1 has a certain degree of "upward arch" effect, which has a certain degree of closing effect on the concrete cracks at the bottom of the beam structure, and greatly improves the safety of the beam structure reinforcement construction period. A certain thickness of reinforced concrete material is added to the bottom and side of the beam 1 to increase the height and width of the beam cross section, which can effectively improve the rigidity and bearing capacity of the beam structure, and the newly added concrete wraps the external prestressed device, effectively solving the anti-corrosion problem of the prestressed steel strand.

[0075] The external prestressed reinforcement device and reinforcement method for reinforced concrete beams of port workers in this embodiment adopts a method of combining external prestressing and increasing the cross-section to improve the rigidity and bearing capacity of the reinforced concrete beam structure, which can give full play to the advantages of both the external prestressing reinforcement method and the increased cross-section reinforcement method. For damaged beam structures, the external prestressing can be used to effectively repair the existing damage of the structure, which greatly improves the safety of the beam reinforcement construction period. The increased cross-section can greatly improve the rigidity and bearing capacity of the original beam structure.

[0076] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

[0077] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A reinforcement method for an external prestressed reinforcement device for reinforced concrete beams of a port engineering project, characterized in that: The steps include: Step 1) Drill holes in the beam A plurality of evenly spaced through holes are processed on two symmetrical beam walls of the reinforced concrete beam (1) to be reinforced, and the concrete around the holes is roughened; holes are drilled on the beam wall of the reinforced concrete beam (1) to be reinforced using a core drilling machine, and anchor blocks (3) and support blocks (4) are cast in the holes; Step 2) Casting of anchor blocks Grouting node anchor blocks (3) are cast in two through holes located at the outermost ends of the reinforcement area on two symmetrical beam walls, and then maintained; a portion of the anchor block (3) is located in the hole and another portion is located outside the hole; before casting the anchor block (3), an anchor pad (5) and a PVC sleeve (8) should be pre-buried; Step 3) Casting of support blocks Grouting material is used to cast support blocks (4) in all other through holes on the two symmetrical beam walls, and curing is performed; a portion of the support block (4) is located inside the hole and another portion is located outside the hole; and a PVC sleeve (8) should be pre-buried before casting the support block (4); Step 4) Anchor installation When the material strength of the anchor block (3) in step 3 and the support block (4) in step 4 reaches or exceeds the required strength, the anchor (6) is installed on the anchor pad (5) in the anchor block (3) on the reinforced concrete beam (1) using structural adhesive and then maintained; Step 5) Cutting the steel strands The steel strand (2) is inserted into the reserved holes of the anchor block and the support block, and the steel strand (2) is manually pulled. The exposed lengths of both ends of the steel strand (2) must be the same; Step 6) Jack Installation Jacks (7) are installed on all anchors (6) on the reinforced concrete beam (1), and both ends of the steel strand (2) are inserted into the jacks (7); the center of the anchor (6) is aligned with the center of the PVC sleeve (8), and the position of the jack is adjusted so that the jack (7), the PVC sleeve (8) and the anchor (6) are located on the same axis, and the jack is in close contact with the anchor; Step 7) Prestressing of the steel strand (2) Open all jacks (7) and pre-tension the steel strand (2) so that the steel strand (2) reaches a stressed state from a relaxed state, thereby eliminating the measurement error of the elongation value; after pre-tensioning, formal tensioning is performed, and the prestressing is divided into five stages: 0σcon to 0.2σcon, 0.2σcon to 0.4σcon, 0.4σcon to 0.6σcon, 0.6σcon to 0.8σcon, and 0.8σcon to 1.0σcon, where σcon represents the tension control stress. After each loading stage is completed, the steel strand (2) is left to stand for 1-2 minutes, and tensioning is performed again after the deformation of the steel strand (2) is stable. After the tension control stress is reached, the jacks (7) are removed; Step 8) Remove the concrete at the bottom of the beam and the original corroded main reinforcement After the reinforced concrete beam (1) is reinforced with external prestressing, the deteriorated concrete at the bottom of the beam is removed by electric hammer and manual chiseling to 20-30 mm behind the main reinforcement, and the compacted part is cleaned. The original corroded main reinforcement is removed, and the joint surface is roughened and the edges and corners of the original beam are knocked off; the steel bars and concrete surface are cleaned with high-pressure fresh water, and after cleaning, cement-based migration-type steel bar rust-proof coating is immediately applied twice; Step 9) Increase the cross-section of the beam bottom for reinforcement Based on the beam structure review calculation, determine the increased cross-sectional dimensions and number of reinforcing steel bars for the reinforced concrete beam (1); The device for reinforcing reinforced concrete beams in external prestressing of a port engineering project comprises two prestressing reinforcement units symmetrically arranged on two beam walls of a reinforced concrete beam (1) to be reinforced, the prestressing reinforcement units comprising two anchor blocks (3), at least one supporting block (4), two anchors (6) and at least one steel strand (2), the two anchor blocks (3) being arranged at both ends of the reinforcement area of ​​the beam wall of the reinforced concrete beam (1), all supporting blocks (4) being evenly spaced and arranged between the two anchor blocks (3) and arranged on the reinforced concrete beam wall. On the beam wall of the earth beam (1); the two anchor blocks (3) and all the support blocks (4) are tightly fixed to the beam wall of the reinforced concrete beam (1) to ensure the rigidity and bearing capacity of the anchor blocks (3) and the support blocks (4); the steel strand (2) passes through the two anchor blocks (3) and all the support blocks (4); two anchors (6) are respectively arranged on the outer end surfaces of the two anchor blocks (3), and the two ends of the steel strand (2) pass through the two anchors (6); the steel strand (2) is pre-tensioned by means of an additional jack (7) on the two anchors (6).

2. The reinforcement method according to claim 1, characterized in that: A PVC sleeve (8) for the steel strand (2) to pass through is embedded in the two anchor blocks (3) and all the support blocks (4).

3. The reinforcement method according to claim 2, characterized in that: The anchor block (3) and the support block (4) are both made by pouring grouting material.

4. The reinforcement method according to claim 3, characterized in that: The PVC sleeve (8) is pre-buried in the anchor block (3) and the support block (4).

5. The reinforcement method according to claim 3, characterized in that: Anchor pads (5) are pre-buried in the outer end surfaces of the two anchor blocks (3), and the two anchors (6) are respectively connected to the two anchor pads (5).

6. The reinforcement method according to claim 1, characterized in that: In step 1, the distance between each two adjacent holes is equal, and the distance between adjacent holes is twice the height of the beam.

7. The reinforcement method according to claim 1, characterized in that: In step 2 and step 3, a plurality of PVC sleeves (8) may be pre-buried in one anchor block (3) and one support block (4), the number of PVC sleeves (8) pre-buried in one anchor block (3) and one support block (4) is equal, and the number of PVC sleeves (8) pre-buried in one anchor block (3) and one support block (4) is equal to the number of steel strands (2).

8. The reinforcement method according to claim 1, characterized in that: In step 9, reinforcement is planted on the beam wall of the reinforced concrete beam (1), and a certain thickness of reinforced concrete material is added to the lower part of the reinforced concrete beam (1), and the newly added concrete wraps the external prestressing device.

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