A reinforcement device for restraining horizontal earth pressure in a city wall and a reinforcement method thereof

Abstract

The invention discloses a reinforcement device for restraining horizontal earth pressure in a city wall and a reinforcement method thereof, comprising a prestressed threaded steel bar arranged in an expansion area of ​​the city wall, a hole being opened on the city wall, an anchoring expansion cavity being opened at the end of the hole, and a tensioning expansion cavity being opened at the initial end of the hole; an anchoring component being arranged at one end of the prestressed threaded steel bar, and a tensioning component being arranged at the other end of the prestressed threaded steel bar; the invention is provided with prestressed threaded steel bar, anchoring steel pad fixing nut, anchoring steel pad, fixing anchor, anchoring limit plate fixing nut, anchoring limit plate, tensioning steel pad, stiffening rib, steel washer and tensioning anchor, which can restrain the horizontal earth pressure of soil inside the city wall on the city wall, solve the safety problem of swelling or even collapse of the city wall caused by horizontal earth pressure inside the city wall, less disturbance to the original city wall, less impact on the city wall structure, can be widely used in the repair and reinforcement project of city wall ruins structure, and has important engineering value.

Description

Technical Field

[0001] The invention belongs to the technical field of city wall ruins reinforcement and protection, and in particular relates to a reinforcement device for restraining horizontal earth pressure in a city wall and a reinforcement method thereof. Background Art

[0002] In ancient times, city walls served as defensive buildings to protect cities from foreign invasions. They embody the wisdom and sweat of countless ancient working people, and also contain the rich cultural history of the city or country. Due to the large-scale urban construction in the last century, ancient city walls were severely damaged. There are very few existing city walls that can be included in the comprehensive protection. Therefore, we need to strengthen the protection, repair and reinforcement of existing city walls. Common city wall structures are generally composed of internal rammed earth and external stone or brick masonry on both sides. Due to the long age of the construction, the city wall structure has inevitably suffered varying degrees of damage. The most significant damage is the swelling or even collapse of the external stone or brick masonry due to the horizontal soil pressure of the internal rammed earth.

[0003] At present, the commonly used methods for the bulging and collapse of city walls include lining structure reinforcement, pressure grouting reinforcement and anchor reinforcement. Lining structure reinforcement refers to the use of high-strength structural materials to line the interior of the damaged structure to form a composite structure in which the new and old structures work together. This method requires digging up the internal rammed earth and then pouring the lining structure, which causes great damage to the interior of the city wall, requires a large amount of construction, and a long construction period. In addition, the difference in mechanical properties between the lining structure and the original structure makes it impossible to ensure that the new and old structures work together; pressure grouting reinforcement refers to the process of injecting cement slurry into various cracks in the rammed earth near the wall through pressure grouting. The hardening of the cement slurry squeezes the soil, increases the particle connection density, improves the soil density, stability and strength, and reduces the effect of the soil on the city wall. Although this method is not It is necessary to excavate the soil, but the reinforcement effect on the original structure is not easy to grasp, and there is no quantitative data provided. In addition, this method will produce a large expansion force on the soil inside the city wall, causing the city wall to bulge aggravatedly. Anchor reinforcement is a method of inserting reinforcement into the soil after drilling and then performing pressure grouting. The diffusion effect of pressure grouting into the soil is used to make the reinforcement bonded to the soil over the entire length, thereby strengthening the internal rammed earth strength and limiting its displacement. This method is suitable for small-scale wall bulging. When dealing with large-area wall bulging, a large number of dense anchors will be used, the construction volume is large, and it has a great impact on the city wall, which violates the principle of minimum intervention in cultural relics protection, repair and reinforcement. For this reason, we propose a reinforcement device and reinforcement method for constraining horizontal soil pressure inside the city wall. Summary of the invention

[0004] The object of the present invention is to provide a reinforcement device and a reinforcement method for constraining horizontal earth pressure in a city wall, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a reinforcement device for restraining horizontal soil pressure in a city wall, comprising a prestressed threaded steel bar arranged in an expansion area of ​​the city wall, a hole for inserting the prestressed threaded steel bar is opened on the city wall corresponding to the expansion area, an anchoring expansion cavity is opened at the end of the hole, and a tensioning expansion cavity is opened at the initial end of the hole;

[0006] One end of the prestressed threaded steel bar is provided with an anchoring assembly for being arranged in the anchoring expansion cavity, and the other end of the prestressed threaded steel bar is provided with a tensioning assembly for being arranged in the tensioning expansion cavity;

[0007] The channel is also provided with a grouting pipe connected to the anchor expansion cavity and the tension expansion cavity. The grouting pipe is used to inject slurry into the anchor expansion cavity and the tension expansion cavity to solidify and fix the anchor components and tension components in the anchor expansion cavity and the tension expansion cavity.

[0008] Preferably, the anchor assembly comprises an anchor steel plate fixing nut, an anchor steel plate and a fixing anchor;

[0009] The fixing anchor is arranged at the end of the prestressed threaded steel bar in the anchor expansion cavity, the anchor steel plate is sleeved on the prestressed threaded steel bar, and the anchor steel plate is arranged on the outside of the fixing anchor, the anchor steel plate fixing nut is threadedly arranged on the prestressed threaded steel bar, and the anchor steel plate fixing nut is used to tighten and fix the anchor steel plate.

[0010] Preferably, the anchor assembly further comprises an anchor limit plate fixing nut and an anchor limit plate, wherein the anchor limit plate fixing nut and the anchor limit plate are arranged on the prestressed threaded steel bar at a position close to the anchor expansion cavity, and the anchor limit plate fixing nut is used to tighten and fix the anchor limit plate;

[0011] The anchoring limit plate is provided with a pipe hole for the grouting pipe to pass through.

[0012] Preferably, the slurry injected into the anchoring expansion cavity through the grouting pipe solidifies to form an anchoring fixing area.

[0013] Preferably, a section of the tensioning expansion cavity close to the anchoring expansion cavity is solidified by slurry injected through the grouting pipe to form a tensioning and fixing first area, and one end of the prestressed threaded steel bar facing the tensioning expansion cavity extends out of the outside of the tensioning and fixing first area.

[0014] Preferably, the tensioning assembly comprises a tensioning steel plate, stiffening ribs, steel washers and tensioning anchors;

[0015] The tensioning steel plate is arranged on one end of the prestressed threaded steel bar extending out of the tensioning and fixing first area, the stiffening rib and the steel washer are arranged on the tensioning steel plate, and the tensioning anchor is arranged on the outside of the steel washer.

[0016] Preferably, the stiffening ribs and the steel washers are welded layer by layer on a side of the tensioning steel plate away from the first tensioning and fixing area.

[0017] Preferably, a section of the tension anchor is provided in the tension expansion cavity, and the slurry injected through the grouting pipe solidifies to form a second tensioning and fixing area.

[0018] Preferably, the channel is also provided with a corrugated pipe for sleeve-mounting the prestressed threaded steel bar and the grouting pipe inside.

[0019] A reinforcement method for a reinforcement device for restraining horizontal earth pressure in a city wall comprises the following steps:

[0020] A: Determine the construction location of the prestressed threaded steel bars in the expansion area of ​​the city wall according to the expansion area, structural dimensions and actual soil conditions inside the city wall. Remove the stone and brickwork on the city wall at the determined construction location as a whole to reveal the rammed earth structure on the city wall.

[0021] B: Then use a drilling rig to drill a hole on the exposed rammed earth structure until the drill bit of the drilling rig reaches the opposite wall of the wall expansion area, and the end of the hole is kept at a certain distance from the opposite wall. Then, the end of the hole is drilled into an anchor expansion cavity, and the beginning of the hole is drilled into a tension expansion cavity.

[0022] C: Then insert the corrugated pipe into the hole, and then insert one end of the prestressed threaded steel bar into the anchor limit plate, the anchor limit plate fixing nut, the anchor steel pad fixing nut, the anchor steel pad and the fixing anchor, and then tighten the anchor limit plate fixing nut and the anchor steel pad fixing nut to tighten and fix the anchor limit plate and the anchor steel pad;

[0023] D: Then insert the end of the prestressed threaded steel bar equipped with the fixed anchor into the hole, insert the fixed anchor into the anchor expansion cavity, and make the anchor limit plate located in the hole, then insert the grouting pipe into the corrugated pipe, and at the same time, extend the grouting pipe through the pipe hole on the anchor limit plate to the anchor expansion hole;

[0024] E: Then use the grouting pipe to inject grout into the anchor expansion hole under pressure, and then inject grout into the tensioning and fixing first area in the tensioning and enlarging cavity. After the grout in the anchor expansion hole and the tensioning and fixing first area is hardened, a tensioning steel plate welded with stiffening ribs and steel washers is inserted on the prestressed threaded steel bar outside the tensioning and fixing first area, and then the tensioning anchor is installed on the outside of the tensioning steel plate on the prestressed threaded steel bar. Then, the tensioning device is used to tension the prestressed threaded steel bar until the tensioning value reaches the set requirement;

[0025] F: Then fill the second tensioning fixed area in the tensioning expansion cavity with slurry. After the slurry hardens, install the removed stone or brick masonry on the city wall to restore the city wall to its original appearance. If the removed stone or brick masonry has obvious weathering, use stone or brick masonry with the same specifications and sizes without obvious weathering to fill the gap and the city wall reinforcement is completed.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention is provided with prestressed threaded steel bars, anchor steel pad fixing nuts, anchor steel pads, fixing anchors, anchor limit plate fixing nuts, anchor limit plates, tension steel pads, stiffening ribs, steel washers and tension anchors, which can restrain the horizontal earth pressure of the soil inside the city wall on the city wall, solve the safety problem of the city wall swelling or even collapse caused by the horizontal earth pressure inside the city wall, and the disturbance to the original city wall is small, and the impact on the city wall structure is small, which can be widely used in the repair and reinforcement project of the city wall ruins structure, and has important engineering value;

[0028] 2. By adopting the city wall reinforcement construction method of the present invention, the quality of the project construction can be guaranteed, and the city wall reinforcement construction method is simple and reliable to construct, the construction period is short, and the construction cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the connection between the city wall and the device of the present invention;

[0030] Figure 2 It is a schematic diagram of the action range of the constraint horizontal diagram pressure in the city wall of the present invention;

[0031] Figure 3 It is a schematic structural diagram of the anchor assembly of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the tensioning assembly of the present invention;

[0033] Figure 5 It is a schematic structural diagram of the tensioning steel pad, stiffening ribs and steel washers of the present invention.

[0034] In the figure: 1. City wall; 2. Prestressed threaded steel bars; 3. Anchorage fixing area; 4. Anchorage expansion cavity; 5. Tensioning expansion cavity; 6. Grouting pipe; 7. Corrugated pipe; 8. Anchor steel pad fixing nut; 9. Anchor steel pad; 10. Fixed anchor; 11. Anchor limit plate fixing nut; 12. Anchor limit plate; 13. Tensioning steel pad; 14. Stiffening ribs; 15. Steel washers; 16. Tensioning anchor; 17. Tensioning fixing first area; 18. Tensioning fixing second area. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 5 The reinforcement device for restraining horizontal earth pressure in a city wall provided by the present invention comprises a prestressed threaded steel bar 2 arranged in an expansion area of ​​a city wall 1, a hole for inserting the prestressed threaded steel bar 2 is provided on the city wall 1 corresponding to the expansion area, an anchoring expansion cavity 4 is provided at the end of the hole, a tensioning expansion cavity 5 is provided at the beginning of the hole, and a corrugated pipe 7 for sleeve-arranging the prestressed threaded steel bar 2 and a grouting pipe 6 inside is also provided in the hole;

[0037] One end of the prestressed threaded steel bar 2 is provided with an anchoring assembly for being arranged in the anchoring expansion cavity 4, the anchoring assembly includes an anchoring steel pad fixing nut 8, an anchoring steel pad 9 and a fixing anchor 10, the fixing anchor 10 is arranged at the end of the prestressed threaded steel bar 2 in the anchoring expansion cavity 4, the anchoring steel pad 9 is sleeved on the prestressed threaded steel bar 2, and the anchoring steel pad 9 is arranged on the outside of the fixing anchor 10, the anchoring steel pad fixing nut 8 is threadedly arranged on the prestressed threaded steel bar 2, and the anchoring steel pad fixing nut 8 is used to tighten and fix the anchor steel pad 9, and the anchor assembly also includes an anchor limit plate fixing nut 11 and an anchor limit plate 12. The anchor limit plate fixing nut 11 and the anchor limit plate 12 are arranged on the prestressed threaded steel bar 2 at a position close to the anchor expansion cavity 4. The anchor limit plate fixing nut 11 is used to tighten and fix the anchor limit plate 12. A pipe hole for the grouting pipe 6 to pass through is opened on the anchor limit plate 12. The slurry injected into the anchor expansion cavity 4 through the grouting pipe 6 solidifies to form an anchor fixing area 3;

[0038] The other end of the prestressed threaded steel bar 2 is provided with a tensioning assembly for being arranged in the tensioning expansion cavity 5, the tensioning assembly comprising a tensioning steel plate 13, a stiffening rib 14, a steel washer 15 and a tensioning anchor 16, the tensioning steel plate 13 is arranged on one end of the prestressed threaded steel bar 2 extending out of the first tensioning and fixing area 17, the stiffening rib 14 and the steel washer 15 are arranged on the tensioning steel plate 13, the tensioning anchor 16 is arranged on the outside of the steel washer 15, and the stiffening rib 14 and the steel washer 15 are respectively welded layer by layer on the tensioning steel plate 13 on a side away from the first tensioning and fixing area 17;

[0039] A grouting pipe 6 connected to the anchoring expansion chamber 4 and the tensioning expansion chamber 5 is also provided in the duct. The grouting pipe 6 is used to inject slurry into the anchoring expansion chamber 4 and the tensioning expansion chamber 5 to solidify and fix the anchoring components and the tensioning components in the anchoring expansion chamber 4 and the tensioning expansion chamber 5. The slurry injected by the grouting pipe 6 in a section of the tensioning expansion chamber 5 close to the anchoring expansion chamber 4 solidifies to form a tensioning and fixing first area 17. An end of the prestressed threaded steel bar 2 extending toward the tensioning expansion chamber 5 extends outward of the tensioning and fixing first area 17. A section of the tensioning expansion chamber 5 provided with a tensioning anchor 16 solidifies the slurry injected by the grouting pipe 6 to form a tensioning and fixing second area 18.

[0040] The present invention is provided with prestressed threaded steel bars 2, anchor steel pad fixing nuts 8, anchor steel pads 9, fixed anchors 10, anchor limit plate fixing nuts 11, anchor limit plates 12, tensioned steel pads 13, stiffening ribs 14, steel washers 15 and tensioned anchors 16, which can restrain the horizontal earth pressure of the soil inside the city wall 1 on the city wall 1, solve the safety problem of the city wall bulging or even collapse caused by the horizontal earth pressure inside the city wall 1, and less disturbance to the original city wall, and little impact on the structure of the city wall 1, can be widely used in the repair and reinforcement projects of the city wall ruins structure, and has important engineering value.

[0041] The reinforcement method of the reinforcement device for restraining horizontal earth pressure in a city wall provided in this embodiment comprises the following steps:

[0042] A: The city wall 1 is a rammed earth city wall with a trapezoidal structure and stone or brick masonry on both sides. One side of the city wall 1 expands and a trend of expansion displacement is found through long-term monitoring. The expansion area of ​​the city wall 1 is repaired and reinforced. The construction position of the prestressed threaded steel bars 2 in the expansion area of ​​the city wall 1 is determined according to the expansion area, structural dimensions and actual soil conditions in the city wall 1. The stone and brick masonry on the city wall 1 at the determined construction position are removed as a whole to reveal the rammed earth structure on the city wall 1;

[0043] B: Then use a drilling rig to drill a hole on the exposed rammed earth structure, with a hole diameter of 100 mm, until the drill bit of the drilling rig drills to the opposite wall of the expansion area of ​​the city wall 1, and the end of the hole is kept at a certain distance from the opposite wall 1 to avoid the disturbance of the drilling on the outer wall of the opposite wall 1. Then, the end of the hole is drilled into an anchoring expansion cavity 4, and the initial end of the hole is drilled into a tensioning expansion cavity 5. The diameters of the anchoring expansion cavity 4 and the tensioning expansion cavity 5 are both 600 mm, and the depths are both 600 mm;

[0044] C: Then insert the corrugated pipe 7 into the hole, and then insert one end of the prestressed threaded steel bar 2 with a diameter of 30 mm into the anchor limit plate 12, the anchor limit plate fixing nut 11, the anchor steel pad fixing nut 8, the anchor steel pad 9 and the fixing anchor 10. The anchor limit plate 12 has a diameter of 100 mm and a thickness of 5 mm. The anchor steel pad has a diameter of 100 mm and a thickness of 10 mm. Then tighten the anchor limit plate fixing nut 11 and the anchor steel pad fixing nut 8, so that the anchor limit plate 12 and the anchor steel pad 9 are screwed and fixed;

[0045] D: Then insert one end of the prestressed threaded steel bar 2 equipped with the fixed anchor 10 into the hole, insert the fixed anchor 10 into the anchor expansion cavity 4, and make the anchor limit plate 12 located in the hole, then insert the grouting pipe 6 into the corrugated pipe 7, and at the same time, the grouting pipe 6 passes through the pipe hole on the anchor limit plate 12 and extends into the anchor expansion hole 4;

[0046] E: Then use the grouting pipe 6 to inject grout into the anchor expansion hole 4 under pressure, and then inject grout into the tensioning and fixing first area 17 in the tensioning expansion cavity 5. After the grout at the anchor expansion hole 4 and the tensioning and fixing first area 17 are hardened, a tensioning steel pad 13 welded with stiffening ribs 14 and steel washers 15 is inserted into the prestressed threaded steel bar 2 outside the tensioning and fixing first area 17. The tensioning steel pad 13 has a diameter of 300 mm and a thickness of 15 mm. The stiffening rib 14 has a thickness of 14 mm. The steel washer 15 has a diameter of 150 mm and a thickness of 10 mm. Then install the tensioning anchor 16 on the outside of the tensioning steel pad 13 on the prestressed threaded steel bar 2, and then use the tensioning device to tension the prestressed threaded steel bar 2 until the tensioning value reaches the set requirement;

[0047] F: Then fill the tensioning and fixing second area 18 in the tensioning and enlarging cavity 5 with slurry. After the slurry hardens, install the removed stone or brickwork on the city wall 1 to restore the city wall 1 to its original appearance. If the removed stone or brickwork has obvious weathering, use stone or brickwork with the same specifications and size without obvious weathering to repair it. The reinforcement of the city wall 1 is completed.

[0048] By adopting the city wall reinforcement construction method of the present invention, the quality of engineering construction can be guaranteed, and the city wall reinforcement construction method is simple and reliable to construct, has a short construction period, and reduces construction costs.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reinforcement method for a reinforcement device for restraining horizontal earth pressure in a city wall, the reinforcement device for restraining horizontal earth pressure in a city wall comprising a prestressed threaded steel bar (2) arranged in an expansion area of ​​the city wall (1), a hole for inserting the prestressed threaded steel bar (2) being provided on the city wall (1) corresponding to the expansion area, an anchoring expansion cavity (4) being provided at the end of the hole, and a tensioning expansion cavity (5) being provided at the beginning of the hole; One end of the prestressed threaded steel bar (2) is provided with an anchoring component for being arranged in the anchoring enlarged cavity (4), and the other end of the prestressed threaded steel bar (2) is provided with a tensioning component for being arranged in the tensioning enlarged cavity (5); The hole is also provided with a grouting pipe (6) connected to the anchoring expansion cavity (4) and the tensioning expansion cavity (5), and the grouting pipe (6) is used to inject grout into the anchoring expansion cavity (4) and the tensioning expansion cavity (5) to solidify and fix the anchoring components and the tensioning components in the anchoring expansion cavity (4) and the tensioning expansion cavity (5); The grout injected into a section of the tensioning expansion cavity (5) close to the anchoring expansion cavity (4) through the grouting pipe (6) solidifies to form a tensioning and fixing first area (17), and one end of the prestressed threaded steel bar (2) facing the tensioning expansion cavity (5) extends outside the tensioning and fixing first area (17); A section of a tension anchor (16) is provided in the tension expansion cavity (5), and slurry injected through the grouting pipe (6) solidifies to form a tension fixing second area (18); Features: The steps include: A: The construction position of the prestressed threaded steel bar (2) in the expansion area of ​​the city wall (1) is determined according to the expansion area of ​​the city wall (1), the structural dimensions and the actual soil conditions in the city wall (1), and the stone slabs and brickwork on the city wall (1) at the determined construction position are completely removed to reveal the rammed earth structure on the city wall (1); B: Then, a drilling machine is used to drill a hole in the exposed rammed earth structure until the drill bit of the drilling machine reaches the opposite wall of the expansion area of ​​the wall (1), and the end of the hole is kept at a certain distance from the opposite wall (1). Then, the end of the hole is drilled into an anchoring expansion cavity (4), and the initial end of the hole is drilled into a tensioning expansion cavity (5); C: Then the corrugated tube (7) is inserted into the hole, and then one end of the prestressed threaded steel bar (2) is inserted into the anchor limit plate (12), the anchor limit plate fixing nut (11), the anchor steel pad fixing nut (8), the anchor steel pad (9) and the fixing anchor (10), and then the anchor limit plate fixing nut (11) and the anchor steel pad fixing nut (8) are tightened, so that the anchor limit plate (12) and the anchor steel pad (9) are screwed and fixed; D: Then, insert one end of the prestressed threaded steel bar (2) equipped with the fixing anchor (10) into the hole, insert the fixing anchor (10) into the anchor expansion cavity (4), and make the anchor limit plate (12) be located in the hole, then insert the grouting pipe (6) into the corrugated pipe (7), and at the same time, the grouting pipe (6) passes through the pipe hole on the anchor limit plate (12) and extends into the anchor expansion cavity (4); E: Then, a grouting pipe (6) is used to inject grout into the anchor expansion cavity (4) under pressure, and then grout is injected into the tensioning and fixing first area (17) in the tensioning and fixing cavity (5). After the grout in the anchor expansion cavity (4) and the tensioning and fixing first area (17) are hardened, a tensioning steel pad (13) welded with a stiffening rib (14) and a steel washer (15) is inserted onto the prestressed threaded steel bar (2) outside the tensioning and fixing first area (17). Then, a tensioning anchor (16) is installed on the outside of the tensioning steel pad (13) on the prestressed threaded steel bar (2). Then, a tensioning device is used to tension the prestressed threaded steel bar (2) until the tensioning value reaches the set requirement. F: Then fill the tensioning and fixing second area (18) in the tensioning and enlarged cavity (5) with slurry. After the slurry hardens, install the removed stone or brickwork onto the city wall (1) to restore the city wall (1) to its original appearance. If the removed stone or brickwork has obvious weathering, select stone or brickwork with the same specifications and size without obvious weathering to repair it. The reinforcement of the city wall (1) is completed.

2. The reinforcement method of a reinforcement device for restraining horizontal earth pressure in a city wall according to claim 1, characterized in that: The anchoring assembly comprises an anchoring steel plate fixing nut (8), an anchoring steel plate (9) and a fixing anchor (10); The fixing anchor (10) is arranged at the end of the prestressed threaded steel bar (2) in the anchoring expansion cavity (4), the anchoring steel pad (9) is sleeved on the prestressed threaded steel bar (2), and the anchoring steel pad (9) is arranged on the outside of the fixing anchor (10), the anchoring steel pad fixing nut (8) is threadedly arranged on the prestressed threaded steel bar (2), and the anchoring steel pad fixing nut (8) is used to tighten and fix the anchoring steel pad (9).

3. The method for reinforcing a reinforcing device for restraining horizontal earth pressure in a city wall according to claim 2, characterized in that: The anchor assembly further comprises an anchor limit plate fixing nut (11) and an anchor limit plate (12), wherein the anchor limit plate fixing nut (11) and the anchor limit plate (12) are arranged on the prestressed threaded steel bar (2) at a position close to the anchor expansion cavity (4), and the anchor limit plate fixing nut (11) is used to screw and fix the anchor limit plate (12); The anchoring limit plate (12) is provided with a pipe hole for the grouting pipe (6) to pass through.

4. The reinforcement method of a reinforcement device for restraining horizontal earth pressure in a city wall according to claim 3, characterized in that: The slurry injected into the anchoring expansion cavity (4) through the grouting pipe (6) solidifies to form an anchoring fixing area (3).

5. The reinforcement method of a reinforcement device for restraining horizontal earth pressure in a city wall according to claim 1, characterized in that: The tensioning assembly comprises a tensioning steel plate (13), a stiffening rib (14), a steel washer (15) and a tensioning anchor (16); The tensioning steel plate (13) is arranged on one end of the prestressed threaded steel bar (2) extending out of the tensioning and fixing first area (17), the stiffening rib (14) and the steel washer (15) are arranged on the tensioning steel plate (13), and the tensioning anchor (16) is arranged on the outside of the steel washer (15).

6. The reinforcement method of a reinforcement device for restraining horizontal earth pressure in a city wall according to claim 5, characterized in that: The stiffening ribs (14) and the steel washers (15) are respectively welded layer by layer on a side of the tensioning steel pad (13) away from the tensioning and fixing first area (17).

7. The method for reinforcing a reinforcing device for restraining horizontal earth pressure in a city wall according to claim 1, characterized in that: The channel is also provided with a corrugated tube (7) for sleeve-mounting the prestressed threaded steel bar (2) and the grouting tube (6) inside.

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