A high-strength steel wire mesh and its use method

Abstract

The present invention relates to a high-strength steel wire mesh and a method for using the same. The high-strength steel wire mesh is made of a steel wire. The first section of the steel wire forms a plurality of straight steel wires extending in the vertical direction and distributed at equal intervals in the horizontal direction, and arc-shaped steel wires connecting two adjacent straight steel wires at the upper and lower ends; the second section of the steel wire forms a plurality of straight steel wires extending in the horizontal direction and distributed at equal intervals in the vertical direction, and arc-shaped steel wires connecting two adjacent straight steel wires at the left and right ends; the steel wire mesh is fixedly connected at the intersection; the first section of the steel wire and the second section of the steel wire start at the lower right corner of the steel wire mesh, and the dividing point is at the upper left corner of the steel wire mesh; the high-strength steel wire mesh is chrome-plated or galvanized. The upper and lower fixing methods of the first section of the steel wire and the second section of the steel wire at any one connection point (fixed connection) and its adjacent connection point (fixed connection) are different, so that the tear resistance of the steel wire mesh can be improved.

Description

Technical Field

[0001] The invention belongs to the field of steel wires, and in particular relates to a high-strength steel wire mesh and a use method thereof. Background Art

[0002] Steel wire is one of the four major types of steel: plate, tube, profile, and wire. It is a reprocessed product made from hot-rolled wire rods through cold drawing. It mainly has round, square, rectangular, triangular and other cross-sectional shapes. Steel wire is a basic material that can be further processed into larger diameter steel materials such as steel strands, and can also be processed into materials such as wire mesh, which are used in geotechnical, mechanical and other engineering construction fields, such as the reinforcement of elevator shafts and air shafts. If the steel wire of the wire mesh is too thin, it is easy to be broken and lose its supporting function. If it is too thick, it will increase the construction cost and inconvenience of construction. The excessive weight will also reduce its adhesion (attachment to the shaft wall). In addition, the construction quality of wire mesh made from existing steel wires needs to be improved. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the present invention provides a high-strength steel wire mesh, which is made of only one steel wire, and the steel wire is divided into a first section of steel wire and a second section of steel wire. The first section of steel wire extends in an S-shape in the vertical direction, that is, the first section of steel wire forms a plurality of straight steel wires extending in the vertical direction and distributed at equal intervals in the horizontal direction, and an arc-shaped steel wire connecting two adjacent straight steel wires at the upper and lower ends; the second section of steel wire extends in an S-shape in the horizontal direction, that is, the second section of steel wire forms a plurality of straight steel wires extending in the horizontal direction and distributed at equal intervals in the vertical direction, and an arc-shaped steel wire connecting two adjacent straight steel wires at the left and right ends; the first section of steel wire and the second section of steel wire are fixedly connected at the intersection of the first section of steel wire and the second section of steel wire to form a steel wire mesh; the starting endpoints of the first section of steel wire and the second section of steel wire meet at the lower right corner of the steel wire mesh, and the dividing point is located at the upper left corner of the steel wire mesh; the high-strength steel wire mesh is chrome-plated or galvanized.

[0004] Preferably, at the fixed connection point of the first section of steel wire and the second section of steel wire, in the odd-numbered rows from bottom to top and the odd-numbered fixed connection from right to left, the first section of steel wire is on top and the second section of steel wire is on bottom to form a first contact point, and in the even-numbered fixed connection from right to left, the first section of steel wire is on bottom and the second section of steel wire is on top to form a second contact point; in the even-numbered rows from bottom to top and the even-numbered fixed connection from right to left, the first section of steel wire is on top and the second section of steel wire is on bottom to form a first contact point, and in the odd-numbered fixed connection from right to left, the first section of steel wire is on bottom and the second section of steel wire is on top to form a second contact point; that is, each contact point adjacent to the first contact point is a second contact point, and each contact point adjacent to the second contact point is a first contact point.

[0005] Of course, as a parallel arrangement, the positions of the first contact point and the second contact point can be interchanged.

[0006] Preferably, the fixing method may be welding.

[0007] The method for reinforcing a rectangular shaft using the high-strength steel wire mesh described above, wherein the rectangular shaft may be an elevator shaft or a ventilation shaft, such as an elevator shaft and a ventilation shaft at a subway station entrance or exit, comprises the following construction steps:

[0008] S1, excavate a circular shaft, the diameter of which is larger than the maximum diagonal length of the rectangular horizontal section of the rectangular shaft, and spray a thin layer of concrete as temporary support after excavation;

[0009] S2, laying a wire mesh from the top of the circular shaft downward; the width of the wire mesh is one-fourth of the circumference of the circular shaft, that is, four wire meshes are laid simultaneously in the circumference of the circular shaft; fixing an axial steel plate at the overlapping part of adjacent wire meshes; nails matching the shape and position of the arc-shaped steel wires of the wire mesh are arranged at intervals on the left and right sides of the back of the axial steel plate in the vertical direction; the arrangement of the nails can fix the axial steel plate and the left and right wire meshes together to the circular shaft;

[0010] Preferably, before laying the wire mesh downward, a first circular right-angle steel is fixed at the top of the circular shaft, and nail irons are arranged on the inner surface of the first circular right-angle steel. The nail irons at one corner are used to fix the arc-shaped steel wire at the top of the wire mesh, and the nail irons at the other corner are fixed to the ground; and the first circular right-angle steel is fixedly connected to the top of the axial steel plate;

[0011] S3, constructing the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod at intervals in the vertical direction and grouting; the construction position of the first grouting anchor rod is located on the axial steel plate, and the corresponding first grouting anchor rod construction hole is pre-reserved on the axial steel plate; the second grouting anchor rod and the third grouting anchor rod are on the same horizontal section as the first grouting anchor rod, and the second grouting anchor rod is located in the middle of the adjacent first grouting anchor rod, and the third grouting anchor rod is located on both sides of the second grouting anchor rod;

[0012] Preferably, the length of the first grouting anchor rod and the second grouting anchor rod entering the rock and soil outside the circular vertical shaft is the same, which is longer than the length of the third grouting anchor rod entering the rock and soil outside the circular vertical shaft; and the extension length of the tail ends of the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod is greatly increased compared with conventional anchor rods, and the tail ends extend to a position close to the final required rectangular vertical shaft section;

[0013] Preferably, the first grouting anchor, the second grouting anchor and the third grouting anchor located on the same horizontal section are fixed to the side wall of the circular vertical shaft through the first circular steel plate, and the first circular steel plate is fixedly connected to the axial steel plate to form a supporting whole; the first grouting anchor, the second grouting anchor and the third grouting anchor construction holes are pre-reserved on the first circular steel plate.

[0014] Preferably, the first circular steel plate includes four arc-shaped parts and inner groove parts located between adjacent arc-shaped parts, and the four inner groove parts just clamp the four axial steel plates, thereby improving the connection strength between the first circular steel plate and the axial steel plates.

[0015] S4, when the depth of the circular shaft / rectangular shaft is large, this step is adopted. In the vertical direction, the steel mesh is connected by overlapping. The overlapping method is to use a second circular steel plate with nails on the back to pass through the arc-shaped steel wires of the upper and lower adjacent steel meshes. Except for the nails, the structure of the second circular steel plate is the same as that of the first circular steel plate, and the connection method of the second circular steel plate and the axial steel plate is the same as that of the first circular steel plate;

[0016] S5, fix the bottom of the wire mesh at the bottom end of the circular shaft through a second circular right-angle steel, and set nails on the outer side, i.e., the back side, of the second circular right-angle steel. The nail at one corner is used to fix the arc-shaped steel wire at the bottom end of the wire mesh, and the nail at the other corner is fixed to the bottom surface of the shaft; and the second circular right-angle steel is fixedly connected to the end of the axial steel plate;

[0017] S6, overlap the concrete formwork, the inner wall of the formwork is close to the outer wall of the final required rectangular shaft section, and concrete is poured between the formwork and the inner wall of the circular shaft. The concrete can cover the reinforcement material on the wall of the circular shaft.

[0018] Preferably, the structures of the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod are basically the same, the top end is an anchoring head for stirring the resin medicine roll, the lower part of the anchoring head is a hollow grouting rod body, the tail of the grouting rod body is provided with a tray fastening structure, and the grouting rod body above the tray fastening structure is provided with grouting holes; and four slide grooves are provided on the grouting rod body at the lower part of the anchoring head, the slide grooves are arranged along the axial direction of the grouting rod body and are evenly distributed along the circumferential direction, a plurality of pressure sensing sheets are arranged on the slide rails, the slide rails are slidably arranged on the slide grooves, the length of the slide rails is consistent with the length of the slide grooves, and the height of the slide rails after the pressure sensing sheets are arranged is consistent with the depth of the slide grooves; the pressure sensing sheets are externally connected to a display, and the display displays and records the grouting pressure.

[0019] Preferably, in step S3, after the construction of the grouting anchor hole is completed, a resin roll is loaded at the bottom of the hole, the grouting anchor is inserted, the resin roll is stirred with an anchor head to fix the grouting anchor, the tail of the grouting anchor is fixed by a tray fastening structure, and then grouting is performed through the grouting port at the tail end of the grouting rod body. After the grouting is completed, the grouting port is blocked with a plug, the slide rail with the pressure sensing sheet is pulled out and the slide groove is blocked; during the grouting process, the pressure conditions of each pressure sensing sheet and the accumulated grouting amount are observed, and the main flow direction of the slurry, that is, the position of the main fracture area of ​​the formation, is determined according to the pressure conditions at different observed positions, and then a fourth grouting anchor is added near the grouting anchor; the tail of the fourth grouting anchor is close to the tail of the grouting anchor, and the grouting section of the fourth grouting anchor passes through the main fracture area.

[0020] The beneficial technical effects of the present invention are:

[0021] 1. Only one steel wire (the steel wire is divided into a first section and a second section) is used to make the wire mesh, and the adjacent joints (consolidation points) have different fixing methods, specifically, the upper and lower fixing methods of the first section and the second section of the steel wire of any joint (consolidation point) and its adjacent joint (consolidation point) are different; thereby, the tear resistance of the wire mesh can be improved and the overall strength of the wire mesh can be improved.

[0022] 2. The arc-shaped steel wire at the end of the wire mesh is plugged into the iron nails set on the axial steel plate and fixed to the well wall, which increases the construction speed and also increases the fixing strength of the wire mesh. The setting of the iron nails on the axial steel plate is conducive to fixing both the axial steel plate itself and the wire mesh, killing two birds with one stone.

[0023] 3. Directly excavating a rectangular shaft has a slow construction progress and difficult support, especially the corner position of the rectangular shaft is relatively weak. In this regard, this application proposes a technical solution of first excavating a circular shaft and then pouring concrete to form a rectangular shaft. The circular shaft structure is evenly stressed, has high stability, and does not have obvious weak areas. Based on this, a support solution for the circular shaft is proposed, that is, the axial steel plate is combined with the circular steel plate to form a supporting whole. On each circular steel plate, a first grouting anchor rod, a second grouting anchor rod, and a third grouting anchor rod are constructed; the first grouting anchor rod and the second grouting anchor rod penetrate into the deep stable area, and the third grouting anchor rod reinforces the shallow area, so that the first grouting anchor rod and the second grouting anchor rod can form a suspension effect on the third grouting anchor rod, thereby improving the overall support effect. The tail end of the grouting anchor rod is greatly lengthened to increase the connection strength with the poured concrete. In addition, the four inner groove parts of the first circular steel plate just clamp the four axial steel plates, thereby improving the connection strength between the first circular steel plate and the axial steel plate.

[0024] 4. A creative pressure measurement structure for grouting anchors is proposed, including an axially arranged slide groove and a slide rail with a fixed pressure sensing sheet. The main flow direction of the slurry, that is, the location of the main fracture area of ​​the formation, can be determined according to the pressure conditions at different observed positions, and then the grouting anchors can be supplemented in a targeted manner; at the same time, the stress sensor set on the slide rail can be recycled and reused together with the slide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a steel wire mesh made from steel wires (rope) of the present invention.

[0026] Figure 2 It is a horizontal cross-sectional view of a circular shaft reinforcement using the steel wire mesh of the present invention.

[0027] Figure 3 yes Figure 2 Enlarged view of the mid-axial steel plate.

[0028] Figure 4 It is a schematic diagram of the grouting anchor structure of the present invention.

[0029] Figure 5 It is a radial cross-sectional view of the grouting anchor rod of the present invention.

[0030] In the figure, wire mesh 1, first end steel wire 11, second end steel wire 12, first overlapping method 13, second overlapping method 14, dividing point 15; vertical shaft 2, side wall 21, axial steel plate 3, nail iron 31, first grouting anchor rod 4, second grouting anchor rod 5, third grouting anchor rod 6, anchor head 71, grouting rod body 72, tray fastening structure 73, slide groove 74, slide rail 75, grouting port. DETAILED DESCRIPTION

[0031] like Figure 1 As shown, a high-strength steel wire mesh is made of only one steel wire, which is divided into a first section steel wire 11 and a second section steel wire 12. The first section steel wire extends in an S shape in the vertical direction (S rotated 90°), that is, the first section steel wire forms a plurality of straight steel wires extending in the vertical direction and distributed at equal intervals in the horizontal direction, and an arc-shaped steel wire connecting two adjacent straight steel wires at the upper and lower ends; the second section steel wire extends in an S shape in the horizontal direction, that is, the second section steel wire forms a plurality of straight steel wires extending in the horizontal direction and distributed at equal intervals in the vertical direction, and an arc-shaped steel wire connecting two adjacent straight steel wires at the left and right ends; the first section steel wire and the second section steel wire are fixedly connected at the intersection to form a steel wire mesh 1; the starting ends of the first section steel wire 11 and the second section steel wire 12 meet at the lower right corner of the steel wire mesh, and the dividing point 15 is located at the upper left corner of the steel wire mesh; the high-strength steel wire mesh is chrome-plated or galvanized.

[0032] Preferably, at the fixed connection point of the first section of steel wire and the second section of steel wire, in the odd-numbered rows from bottom to top and the odd-numbered fixed connection points from right to left, the first section of steel wire is on top and the second section of steel wire is on bottom to form a first contact point 13, and at the even-numbered fixed connection points from right to left, the first section of steel wire is on bottom and the second section of steel wire is on top to form a second contact point 14; in the even-numbered rows from bottom to top and the even-numbered fixed connection points from right to left, the first section of steel wire is on top and the second section of steel wire is on bottom to form a first contact point 13, and at the odd-numbered fixed connection points from right to left, the first section of steel wire is on bottom and the second section of steel wire is on top to form a second contact point 14; that is, each contact point adjacent to the first contact point is the second contact point, and each contact point adjacent to the second contact point is the first contact point; that is to say, the upper and lower fixing method of the first steel wire and the second steel wire of any contact point (fixed connection point) and its adjacent contact point (fixed connection point) is different.

[0033] Of course, as a parallel arrangement, the positions of the first contact 13 and the second contact 14 can be interchanged.

[0034] Preferably, the fixing method may be welding.

[0035] The method for reinforcing a rectangular shaft using the high-strength steel wire mesh described above, wherein the rectangular shaft may be an elevator shaft or a ventilation shaft, such as an elevator shaft and a ventilation shaft at a subway station entrance or exit, comprises the following construction steps:

[0036] S1, excavating a circular shaft 2, the diameter of the circular shaft is greater than the maximum diagonal length of the rectangular horizontal section of the rectangular shaft, the circular shaft and the rectangular shaft are located at the same center, and after excavation, a thin layer of concrete is sprayed as a temporary support;

[0037] S2, laying a steel wire mesh 1 from the top of the circular shaft 2 downward; the width of the steel wire mesh is one-fourth of the circumference of the circular shaft, that is, four steel wire meshes are laid simultaneously in the circumference of the circular shaft 2; fixing an axial steel plate 3 at the overlapping part of adjacent steel wire meshes; nail irons 31 matching the shape and position of the arc-shaped steel wires of the steel wire mesh are arranged at intervals in the vertical direction on the left and right sides of the back of the axial steel plate (the outer surface of the axial steel plate, the surface directly in contact with the cross section of the circular shaft); the setting of the nail irons 31 can fix the axial steel plate and the left and right side steel wire meshes together to the circular shaft;

[0038] Preferably, before laying the wire mesh downward, a first circular right-angle steel is fixed at the top of the circular shaft, and nail irons are arranged on the inner surface of the first circular right-angle steel. The nail irons at one corner are used to fix the arc-shaped steel wire at the top of the wire mesh, and the nail irons at the other corner are fixed to the ground; and the first circular right-angle steel is fixedly connected to the top of the axial steel plate;

[0039] S3, construct the first grouting anchor rod 4, the second grouting anchor rod 5 and the third grouting anchor rod 6 at intervals in the vertical direction and grouting; the construction position of the first grouting anchor rod 4 is located on the axial steel plate, and the corresponding first grouting anchor rod construction hole is pre-reserved on the axial steel plate; the second grouting anchor rod 5, the third grouting anchor rod 6 and the first grouting anchor rod 4 are on the same horizontal section, and the second grouting anchor rod 5 is located in the middle of the adjacent first grouting anchor rod, and the third grouting anchor rod 6 is located on both sides of the second grouting anchor rod;

[0040] Preferably, the length of the first grouting anchor rod 4 and the second grouting anchor rod 5 entering the rock and soil outside the circular shaft is the same, which is longer than the length of the third grouting anchor rod 6 entering the rock and soil outside the circular shaft; and the extension length of the tail ends of the first grouting anchor rod 4, the second grouting anchor rod 5 and the third grouting anchor rod 6 is greatly increased compared with conventional anchor rods, and the tail ends extend to a position close to the final required rectangular shaft section;

[0041] Preferably, the first grouting anchor 4, the second grouting anchor 5 and the third grouting anchor 6 located on the same horizontal section are fixed to the side wall of the circular shaft through a first circular steel plate (the tray fastening structure is located inside the first circular steel plate, that is, closer to the center of the circular shaft), and the first circular steel plate is fixedly connected to the axial steel plate to form a supporting whole; construction holes for the first grouting anchor, the second grouting anchor and the third grouting anchor are pre-reserved on the first circular steel plate.

[0042] Preferably, the first circular steel plate includes four arc-shaped parts and inner groove parts located between adjacent arc-shaped parts, and the four inner groove parts just clamp the four axial steel plates, thereby improving the connection strength between the first circular steel plate and the axial steel plates.

[0043] S4, when the depth of the circular shaft / rectangular shaft is large, this step is adopted. In the vertical direction, the steel mesh is connected by overlapping. The overlapping method is to use a second circular steel plate with nail irons on the back to pass through the arc-shaped steel wires of the upper and lower adjacent steel meshes. Except for the nail irons, the structure of the second circular steel plate is the same as that of the first circular steel plate (that is, the second circular steel plate is only provided with nail irons more than the first circular steel plate); the connection method of the second circular steel plate with the first grouting anchor rod 4, the second grouting anchor rod 5 and the third grouting anchor rod 6, and the axial steel plate is the same as that of the first circular steel plate;

[0044] S5, fix the bottom of the wire mesh at the bottom end of the circular shaft through a second circular right-angle steel, and set nails on the outer side, i.e., the back side, of the second circular right-angle steel. The nail at one corner is used to fix the arc-shaped steel wire at the bottom end of the wire mesh, and the nail at the other corner is fixed to the bottom surface of the shaft; and the second circular right-angle steel is fixedly connected to the end of the axial steel plate;

[0045] S6, overlap the concrete formwork, the inner wall of the formwork is close to the outer wall of the final required rectangular shaft section, and concrete is poured between the formwork and the inner wall of the circular shaft. The concrete can cover the reinforcement materials on the wall of the circular shaft (including the exposed tail of the grouting anchor, right-angle steel, wire mesh, steel plate, etc.);

[0046] Preferably, the structures of the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod are basically the same (the anchor rod lengths may be different), the top end is an anchor head 71 for stirring the resin medicine roll, the lower part of the anchor head is a hollow grouting rod body 72, and a tray fastening structure 73 (including a tray and a fastening nut) is provided at the tail of the grouting rod body, and grouting holes are provided on the grouting rod body above the tray fastening structure; and four slide grooves 74 are provided on the grouting rod body at the lower part of the anchor head, and the slide grooves are arranged along the axial direction of the grouting rod body and are evenly distributed along the circumferential direction, and a plurality of pressure sensing sheets are arranged on a slide rail 75, and the slide rail 75 is slidably arranged on the slide groove 74, the length of the slide rail is consistent with the length of the slide groove, and the height of the slide rail after the pressure sensing sheet is set is consistent with the depth of the slide groove; the pressure sensing sheet is externally connected to a display, and the display displays and records the grouting pressure.

[0047] Preferably, in step S3, after the construction of the grouting anchor hole is completed, a resin roll is loaded at the bottom of the hole, the grouting anchor is inserted, the anchor head 71 is used to stir the resin roll to fix the grouting anchor, the tail of the grouting anchor is fixed by the tray fastening structure 73, and then grouting is performed through the grouting port 76 at the tail end of the grouting rod body 72. After the grouting is completed, the grouting port is blocked with a plug, the slide rail 75 with the pressure sensing sheet is pulled out and the slide groove is blocked; during the grouting process, the pressure conditions of each pressure sensing sheet and the accumulated grouting amount are observed, and the main flow direction of the slurry, that is, the position of the main fracture area of ​​the formation (including the circumferential orientation of the fracture area and the depth from the well wall) is determined according to the pressure conditions at different observed positions, and then a fourth grouting anchor is added near the grouting anchor; the tail of the fourth grouting anchor is close to the tail of the grouting anchor, and the grouting section of the fourth grouting anchor passes through the main fracture area.

Claims

1. A method for reinforcing a rectangular shaft with a high-strength steel wire mesh, wherein the high-strength steel wire mesh is made of only one steel wire, the steel wire comprising a first section of steel wire and a second section of steel wire, the first section of steel wire extending in an S-shape in the vertical direction, that is, the first section of steel wire forms a plurality of straight steel wires extending in the vertical direction and distributed at equal intervals in the horizontal direction, and an arc-shaped steel wire connecting two adjacent straight steel wires at the upper and lower ends; the second section of steel wire extending in an S-shape in the horizontal direction, that is, the second section of steel wire forms a plurality of straight steel wires extending in the horizontal direction and distributed at equal intervals in the vertical direction, and an arc-shaped steel wire connecting two adjacent straight steel wires at the left and right ends; the first section of steel wire and the second section of steel wire are fixedly connected at the intersection of the first section of steel wire and the second section of steel wire to form a steel wire mesh; the starting ends of the first section of steel wire and the second section of steel wire meet at the lower right corner of the steel wire mesh, and the dividing point is located at the upper left corner of the steel wire mesh; the high-strength steel wire mesh is chrome-plated or galvanized; It is characterized in that The construction steps include: S1, excavate a circular shaft, the diameter of which is larger than the maximum diagonal length of the rectangular horizontal section of the rectangular shaft, and spray a thin layer of concrete as temporary support after excavation; S2, laying a wire mesh from the top of the circular shaft downward; the width of the wire mesh is one-fourth of the circumference of the circular shaft, that is, four wire meshes are laid simultaneously in the circumference of the circular shaft; fixing an axial steel plate at the overlapping part of adjacent wire meshes; nails matching the shape and position of the arc-shaped steel wires of the wire mesh are arranged at intervals on the left and right sides of the back of the axial steel plate in the vertical direction; the arrangement of the nails can fix the axial steel plate and the left and right wire meshes together in the circular shaft; S3, construct the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod at intervals in the vertical direction and perform grouting; the construction position of the first grouting anchor rod is located on the axial steel plate, and the corresponding first grouting anchor rod construction hole is reserved in advance on the axial steel plate; the second grouting anchor rod, the third grouting anchor rod and the first grouting anchor rod are on the same horizontal section, and the second grouting anchor rod is located in the middle of the adjacent first grouting anchor rod, and the third grouting anchor rod is located on both sides of the second grouting anchor rod; the length of the first grouting anchor rod and the second grouting anchor rod entering the rock and soil outside the circular vertical shaft is the same, which is longer than the length of the third grouting anchor rod entering the rock and soil outside the circular vertical shaft; and the extension length of the tail ends of the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod is greatly increased compared with conventional anchor rods, and the tail ends extend to a position close to the final required rectangular vertical shaft section; The first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod located on the same horizontal section are fixed to the side wall of the circular shaft through the first circular steel plate, and the first circular steel plate is fixedly connected to the axial steel plate to form a supporting whole; the first circular steel plate is pre-reserved with construction holes for the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod; the first circular steel plate includes four arc-shaped parts and inner groove parts located between adjacent arc-shaped parts, and the four inner groove parts just clamp the four axial steel plates, so as to improve the connection strength between the first circular steel plate and the axial steel plate; The structures of the first grouting anchor rod, the second grouting anchor rod and the third grouting anchor rod are similar, with the top end being an anchor head for stirring the resin medicine roll, the lower part of the anchor head being a hollow grouting rod body, the tail of the grouting rod body being provided with a tray fastening structure, and the grouting rod body above the tray fastening structure being provided with a grouting hole; and four slide grooves are provided on the grouting rod body at the lower part of the anchor head, the slide grooves are provided along the axial direction of the grouting rod body and are evenly distributed along the circumference, a plurality of pressure sensing sheets are provided on the slide rails, the slide rails are slidably provided on the slide grooves, the length of the slide rails is consistent with the length of the slide grooves, and the height of the slide rails after the pressure sensing sheets are provided is consistent with the depth of the slide grooves; the pressure sensing sheets are externally connected to a display, and the display displays and records the grouting pressure; After the construction of the grouting anchor hole is completed, a resin medicine roll is loaded at the bottom of the hole, and the grouting anchor is inserted. The resin medicine roll is stirred with an anchor head to fix the grouting anchor. The tail of the grouting anchor is fixed by a tray fastening structure, and then grouting is performed through the grouting port at the tail end of the grouting rod body. After the grouting is completed, the grouting port is blocked with a plug, and the slide rail with a pressure sensing sheet is pulled out and the slide groove is blocked; during the grouting process, the pressure conditions of each pressure sensing sheet and the accumulated grouting amount are observed, and the main flow direction of the slurry, that is, the position of the main fracture area of ​​the formation, is determined according to the pressure conditions at different observed positions, and then a fourth grouting anchor is added near the grouting anchor; the tail of the fourth grouting anchor is close to the tail of the grouting anchor, and the grouting section of the fourth grouting anchor passes through the main fracture area; S4, when the depth of the circular shaft / rectangular shaft is large, this step is adopted. In the vertical direction, the steel mesh is connected by overlapping. The overlapping method is to use a second circular steel plate with nails on the back to pass through the arc-shaped steel wires of the upper and lower adjacent steel meshes. Except for the nails, the structure of the second circular steel plate is the same as that of the first circular steel plate, and the connection method of the second circular steel plate and the axial steel plate is the same as that of the first circular steel plate; S5, fix the bottom of the wire mesh at the bottom end of the circular shaft through a second circular right-angle steel, and set nails on the outer side, i.e., the back side, of the second circular right-angle steel. The nail at one corner is used to fix the arc-shaped steel wire at the bottom end of the wire mesh, and the nail at the other corner is fixed to the bottom surface of the shaft; and the second circular right-angle steel is fixedly connected to the end of the axial steel plate; S6, overlap the concrete formwork, the inner wall of the formwork is close to the outer wall of the final required rectangular shaft section, and concrete is poured between the formwork and the inner wall of the circular shaft. The concrete can cover the reinforcement material on the wall of the circular shaft.

2. The method according to claim 1, characterized in that At the fixed connection point between the first section of steel wire and the second section of steel wire, in the odd-numbered rows from bottom to top, at the odd-numbered fixed connection point from right to left, the first section of steel wire is on top and the second section of steel wire is on bottom to form a first contact point, and in the even-numbered fixed connection point from right to left, the first section of steel wire is on bottom and the second section of steel wire is on top to form a second contact point; in the even-numbered rows from bottom to top, at the even-numbered fixed connection point from right to left, the first section of steel wire is on top and the second section of steel wire is on bottom to form a first contact point, and in the odd-numbered fixed connection point from right to left, the first section of steel wire is on bottom and the second section of steel wire is on top to form a second contact point; that is, each contact point adjacent to the first contact point is a second contact point, and each contact point adjacent to the second contact point is a first contact point.

3. The method according to claim 2, characterized in that As a parallel arrangement, the positions of the first contact point and the second contact point are interchanged.

4. The method according to any one of claims 1 to 3, characterized in that: The fixing method is welding.

5. The method according to any one of claims 1 to 3, characterized in that: In step S2, before laying the wire mesh downwards, a first circular right-angle steel is fixed at the top of the circular shaft, and nails are set on the inner surface of the first circular right-angle steel. The nails at one corner are used to fix the arc-shaped steel wire at the top of the wire mesh, and the nails at the other corner are fixed to the ground; and the first circular right-angle steel is fixedly connected to the top of the axial steel plate.

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