Construction method of steel mesh protection at the hole of bored pile

Abstract

The present invention relates to the technical field of construction safety, and discloses a method for protecting the bored pile hole with a steel mesh. The method comprises the following steps: determining the bored pile position and burying a casing; laying a ground steel mesh on the outer periphery of the casing; drilling at the pile position to form a pile hole; placing a top steel mesh after the pile hole is drilled to a set depth; performing construction on the top steel mesh and measuring the thickness of the sediment at the bottom of the pile hole; removing the top steel mesh, lowering a steel cage into the pile hole, placing a casting frame at the top of the exposed section, the outer periphery of the casting frame being provided with a casting steel mesh, the casting frame and the casting steel mesh covering the hole mouth; lowering a casting pipe into the pile hole through the casting frame, pouring concrete into the pile hole, and forming a bored pile after solidification. In this way, by laying the ground steel mesh, laying the top steel mesh when measuring the thickness of the sediment at the bottom of the pile hole, and using the casting steel mesh when pouring concrete, workers are always in a safe and protective state during construction, and the construction is convenient, safe, and reliable.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of construction safety, specifically, to a construction method for protecting the hole opening of a bored pile with steel mesh. Background Art

[0002] A cast-in-place pile is a pile made by drilling a hole in place and pouring concrete or reinforced concrete. Due to its advantages such as no vibration, no soil squeezing, low noise during construction, and suitability for use in areas with dense urban buildings, cast-in-place piles are widely used in construction.

[0003] When the pile is bored, the pile driver is required to drill the pile hole 10 so that the pile can be bored. However, there are large holes 30 on both sides of the pouring frame 20. Figure 1 , affected by mud and water operations, the grouting rack 20 is slippery, and there is a safety hazard of workers slipping into the hole. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for constructing a steel mesh protection at the hole mouth of a bored pile, aiming to solve the problem in the prior art that when the ground layer is relatively soft, the hole is prone to collapse. If the casing is not buried deep enough, it is easy to cause the ground around the hole mouth casing to collapse. If the operator accidentally falls in, it will cause a serious safety accident. The on-site construction personnel measure the thickness of the sediment at the bottom of the hole at the center of the hole. The on-site construction personnel need to deviate the center of gravity of the body toward the center of the hole. At this time, there is a certain risk of falling into the pile hole. When pouring concrete, there are large openings on both sides of the pouring frame. Affected by mud and water operations, the pouring frame is relatively slippery, and there is a safety hazard of workers slipping into the hole.

[0005] The present invention is achieved in that the cast-in-place pile hole mouth steel mesh protection construction method comprises the following construction steps:

[0006] 1) Measure and lay out the lines at the construction site to determine the pile position of the bored pile; bury the casing at the pile position, with the lower part of the casing inserted into the pile position to form an inserted section, and the upper part of the casing exposed above the pile position to form an exposed section, and the construction site has a paving area surrounding the outer periphery of the exposed section;

[0007] 2) Laying ground steel mesh on the laying area;

[0008] 3) Drilling at the pile position to form a pile hole, wherein the pile hole is in the area surrounded by the casing, and the top of the exposed section has an opening connected to the pile hole; when the pile hole is drilled to a set depth, a top steel mesh is placed on the top of the exposed section, wherein the top steel mesh covers the opening;

[0009] 4) Carry out construction on the top steel mesh and measure the thickness of the sediment at the bottom of the pile hole;

[0010] 5) Move the top steel mesh out of the top of the exposed section, insert a steel cage into the pile hole, and place a pouring frame for fixing the pouring pipe on the top of the exposed section. The outer periphery of the pouring frame is provided with a pouring steel mesh, and the pouring frame and the pouring steel mesh cover the hole opening;

[0011] 6) Insert a grouting pipe into the pile hole. The upper portion of the grouting pipe passes through a grouting frame and is relatively fixedly connected to the grouting frame. Concrete is poured into the pile hole through the grouting pipe. After the concrete solidifies in the pile hole, a cast-in-place pile is formed.

[0012] Optionally, in step 2), a protection area where a ground steel mesh is laid and a working area where no ground steel mesh is laid are formed on the laying area, and a steel plate is laid on the working area;

[0013] In step 3), the pile hole is constructed using a pile driver; the pile driver is moved to a set position on a steel plate and then drilled into the pile position; after the drill hole is formed, the pile driver is moved outside the working area, the steel plate is removed, and a full-ground steel mesh is laid on the working area.

[0014] Optionally, adjacent ground reinforcement meshes are fixedly connected by rope clips;

[0015] The ground reinforcement mesh includes a plurality of longitudinal reinforcement bars arranged longitudinally and a plurality of transverse reinforcement bars arranged transversely. In one ground reinforcement mesh, the arrangement interval between adjacent longitudinal reinforcement bars is 12 cm, and the arrangement interval between adjacent transverse reinforcement bars is 12 cm.

[0016] Optionally, in step 3), during the drilling process using the drilling rig, after the pile hole is formed, the pile hole is initially cleaned; in step 6), before pouring concrete into the pile hole through the pouring pipe, the air supply pipe is placed in the pouring pipe, and air lift reverse circulation is used for secondary hole cleaning.

[0017] Optionally, in step 5), the pouring frame includes two long channel steels arranged opposite to each other, a short channel steel is connected between the ends of the two long channel steels, and the two short channel steels and the two long channel steels enclose a hollow enclosed area;

[0018] A movable cover is arranged in the middle of the enclosed area, and the movable cover is hinged to swing up and down; the movable cover has a through hole, which passes through the movable cover up and down, and has a semicircular hole opening, two of which are aligned and arranged, and the two through holes are connected to form a central hole for the perfusion tube to pass through;

[0019] The enclosed area is provided with a plurality of pedals for construction workers to stand on, the two ends of the pedals are respectively fixedly connected to two long channel steels, the plurality of pedals are arranged at intervals along the length direction of the long channel steels, and the plurality of pedals are arranged on both sides of the center hole.

[0020] Optionally, in step 5), the cast steel mesh is fixed to the upper surface of the cast frame by welding, the periphery of the cast steel mesh is an oval or square annular steel wire mesh, and the interior of the cast steel mesh is evenly spaced with a plurality of strip-shaped inner steel bars;

[0021] The middle part of the cast steel mesh has a hollow area in a hollow shape, and the hollow area is arranged to overlap with the two movable cover plates.

[0022] Optionally, the central hole and the pile hole are coaxial and concentrically arranged.

[0023] Optionally, the grouting pipe includes an upper conduit and a lower conduit; in step 6), when lowering the grouting pipe into the pile hole, the two movable cover plates are first swung outwards away from each other to a fully open state, the lower conduit is inserted into the pile hole through the enclosed area, and the two movable cover plates are then swung inwards towards each other to a closed state, and the lower conduit is fixed in the center hole;

[0024] The lower conduit has a docking section located above the central hole. The bottom of the upper conduit is docked on the docking section. After the lower conduit and the upper conduit are docked and fixed, the grouting pipe is formed; then the two movable cover plates are swung outwards away from each other to a fully open state, and the grouting pipe is further lowered until the bottom of the grouting pipe and the bottom of the pile hole are spaced 0.3 to 0.5 m apart, and then concrete is poured into the pile hole through the grouting pipe.

[0025] Optionally, the long channel steel is provided with a plurality of mounting grooves formed by cutting, the plurality of mounting grooves being arranged at intervals along the extension direction of the long channel steel, and the mounting grooves on two oppositely arranged long channel steels are relatively aligned; the end plates of the pedals are embedded in the mounting grooves, and the bottoms of the pedal ends are pressed against the mounting grooves from top to bottom;

[0026] The top of the pedal is flush with the top of the long channel steel, and the long channel steel has a through hole extending front to back, and the through hole is arranged along the extension direction of the long channel steel, and the path of the through hole is connected to the plurality of mounting slots; the end of the pedal has a through hole extending transversely, and the through hole is arranged along the width direction of the pedal, and when the end of the pedal is embedded in the mounting slot, the fixing hole and the through hole are arranged to overlap;

[0027] A fixing tube is fixedly inserted into the through hole, and the fixing tube passes through the plurality of fixing holes in sequence to fix the plurality of pedals relatively. An elastic sleeve is provided on the outer periphery of the fixing tube, and the elastic sleeve is extended along the extension direction of the fixing tube, and the elastic sleeve is clamped and fixed in the through hole.

[0028] Optionally, the outer surface of the elastic sleeve is formed with a surrounding outer ring wall, the outer ring wall abuts against the inner side wall of the through hole, and a plurality of elastic protrusions protrude outward from the outer ring wall, the plurality of elastic protrusions are arranged at intervals along the surrounding direction of the outer ring wall, and the plurality of elastic protrusions are arranged at intervals along the extension direction of the elastic sleeve;

[0029] The inner surface of the elastic sleeve is formed with an inner annular wall, which encloses a tube passage for the fixed tube to pass through, and the outer periphery of the fixed tube abuts against the inner annular wall; the inner annular wall has a plurality of blind holes, each of which has an opening toward the tube passage; the outer periphery of the fixed tube has a plurality of inserting heads extending toward the openings, and the inserting heads completely fill the blind holes;

[0030] The outer surface of the embedding head is semicircular, the side wall of the blind hole is covered with an adhesive layer formed by resin glue, and a positioning hole formed by a depression is provided on the outer surface of the embedding head; when the outer surface of the embedding head abuts against the side wall of the blind hole, the resin glue flows into the positioning hole under the extrusion of the force, and after the resin glue solidifies, the adhesive layer is formed, and the embedding head is fixed in the blind hole through the adhesive layer.

[0031] Compared with the existing technology, the present invention provides a method for protecting the bored pile hole mouth with steel mesh. After the casing is buried, the ground steel mesh is laid to play the role of early warning, anti-slip, and anti-fall. When the ground layer is relatively soft, it is easy to collapse. If the casing is not buried deep enough, it is easy to cause the ground around the hole mouth casing to collapse. If the operator accidentally falls in, it will cause a serious safety accident. Therefore, the ground steel mesh plays a role in preventing falls. The design of the top steel mesh allows construction workers to stand above the pile hole to measure the sediment at the bottom of the pile hole without having to lean over to measure, thus preventing workers from falling into the hole. The design of the cast steel mesh completely closes the hole mouth, so that workers are effectively protected when fixing the cast pipe. During the entire construction process, the operators are always under safety protection, and the construction is convenient, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a construction diagram of pouring concrete in the prior art provided by the present invention;

[0033] Figure 2 It is a schematic diagram of the process of the cast-in-place pile hole mouth steel mesh protection construction method provided by the present invention;

[0034] Figure 3 It is a construction diagram of laying ground steel mesh on the laying area provided by the present invention;

[0035] Figure 4 It is a three-dimensional schematic diagram of the pouring frame and the pouring steel mesh in the laying area provided by the present invention;

[0036] Figure 5 It is a schematic cross-sectional view of the long channel steel provided by the present invention;

[0037] Figure 6 The present invention provides Figure 5 Enlarged schematic diagram of point A in the middle. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0040] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] Reference Figure 2-6 The figure shows a preferred embodiment of the present invention.

[0042] The invention provides a cast-in-place pile hole mouth steel mesh protection construction method, comprising the following construction steps:

[0043] 1) Measure and lay out the lines at the construction site to determine the pile position of the bored pile; bury the casing 100 at the pile position, with the lower part of the casing 100 inserted into the pile position to form an inserted section, and the upper part of the casing 100 exposed above the pile position to form an exposed section. The construction site has a paving area surrounding the outer periphery of the exposed section;

[0044] 2) Laying the ground reinforcement mesh 110 on the laying area;

[0045] 3) Drilling at the pile position to form a pile hole, the pile hole is in the area surrounded by the casing 100, and the top of the exposed section has an opening connected to the pile hole; when the pile hole is drilled to a set depth, a top steel mesh is placed on the top of the exposed section, and the top steel mesh covers the opening;

[0046] 4) Carry out construction on the top steel mesh and measure the thickness of the sediment at the bottom of the pile hole;

[0047] 5) Move the top steel mesh out of the top of the exposed section, insert the steel cage into the pile hole, and place a pouring frame for fixing the pouring pipe on the top of the exposed section. The outer periphery of the pouring frame is provided with a pouring steel mesh 200. The pouring frame and the pouring steel mesh 200 cover the hole opening;

[0048] 6) Insert a grouting pipe into the pile hole. The upper part of the grouting pipe passes through the grouting frame and is relatively fixedly connected to the grouting frame. Pour concrete into the pile hole through the grouting pipe. After the concrete solidifies in the pile hole, a cast-in-place pile is formed.

[0049] The above-mentioned cast-in-place pile hole mouth steel mesh protection construction method, after the casing 100 is buried, plays the role of early warning, anti-slip and anti-fall by laying the ground steel mesh 110. When the ground layer is relatively soft, it is easy to collapse. If the casing 100 is not buried deep enough, it is easy to cause the ground around the casing 100 to collapse. If the operator accidentally falls in, it will cause a serious safety accident. In the subsequent process, after the pile hole is formed, the operator falls into the hole; through the design of the top steel mesh, it is possible for the construction personnel to stand above the pile hole to measure the sediment at the bottom of the pile hole without having to lean over to measure, thus avoiding the operator from falling into the hole; through the design of the cast steel mesh 200, since the cast steel mesh 200 completely closes the hole mouth, the operator is effectively protected when fixing the cast-in-place pipe. During the entire construction process, the operator is always under safety protection, and the construction is convenient, safe and reliable.

[0050] Specifically, the laying steel mesh, top steel mesh, and pouring steel mesh 200 are all welded with steel bars, which can make full use of the short steel bars cut when making the steel cage on site, realize waste utilization, and can be reused, with economical production and use costs.

[0051] In step 2), a protection area where the ground reinforcement mesh 110 is laid and a working area where the ground reinforcement mesh 110 is not laid are formed on the laying area, and a steel plate is laid on the working area;

[0052] In step 3), the pile driver is used to construct the pile hole. After the driver is moved to the designated position on the steel plate, drilling is carried out at the pile location. After the hole is drilled, the driver is moved outside the work area, the steel plate is removed, and the work area is covered with ground reinforcement mesh 110. This ensures protection outside the hole opening by reserving a work area, supporting the steel plate for the driver, and then, after drilling is complete, removing the steel plate and covering the ground with reinforcement mesh 110.

[0053] Adjacent ground reinforcement meshes 110 are fixedly connected by rope clamps 111;

[0054] The ground reinforcement mesh 110 includes a plurality of longitudinal reinforcement bars arranged longitudinally and a plurality of transverse reinforcement bars arranged transversely. In one ground reinforcement mesh 110 , the arrangement interval between adjacent longitudinal reinforcement bars is 12 cm, and the arrangement interval between adjacent transverse reinforcement bars is 12 cm.

[0055] The outer periphery of the ground reinforcement mesh 110 is square, and the above-mentioned arrangement structure is provided inside to ensure the overall strength. Multiple rope clips 111 are used to combine multiple ground reinforcement meshes 110 into one piece to avoid being scattered and disordered.

[0056] In step 3), after the pile hole is formed using a drilling rig, the initial hole cleaning is performed. In step 6), before pouring concrete into the pile hole through the grouting pipe, an air supply pipe is placed inside the grouting pipe, and a secondary hole cleaning is performed using air lift reverse circulation. This ensures that the thickness of the pile bottom sediment meets the set requirements before pouring, preventing excessive sediment from causing poor pile quality.

[0057] In step 5), the pouring frame includes two long channel steels 210 arranged opposite to each other, a short channel steel 220 is connected between the ends of the two long channel steels 210, and the two short channel steels 220 and the two long channel steels 210 form a hollow enclosed area;

[0058] A movable cover plate 202 is provided in the middle of the enclosed area. The movable cover plate 202 is hinged to achieve up and down swinging. The movable cover plate 202 has a through hole, which passes through the movable cover plate 202 from top to bottom. The through hole has a semicircular opening, and the two openings are arranged in alignment. The two through holes are connected to form a central hole for the perfusion tube to pass through.

[0059] The enclosed area is provided with a plurality of pedals 230 for construction workers to stand on. The two ends of the pedals 230 are respectively fixedly connected to two long channel steels 210. The plurality of pedals 230 are arranged at intervals along the length direction of the long channel steel 210, and the plurality of pedals 230 are arranged on both sides of the center hole.

[0060] The perfusion tube can be fixed by the design of the movable cover plate 202 that can swing up and down.

[0061] In step 5), the cast steel mesh 200 is fixed on the upper surface of the cast frame by welding. The outer periphery of the cast steel mesh 200 is an oval or square ring-shaped steel wire mesh, and the interior of the cast steel mesh 200 is evenly spaced with a plurality of strip-shaped inner steel bars;

[0062] The central portion of the cast steel mesh 200 has a hollowed-out area, which overlaps with two movable cover plates 202. This allows for the inner steel mesh 201 to be spaced apart throughout the area enclosed by the cast steel mesh 200, excluding the hollowed-out area. This ensures safety for construction workers. Furthermore, the aforementioned movable cover plates 202 are located in the hollowed-out area, ensuring the safety of the entire enclosed area. During construction, workers can step on the pedals 230 or the inner steel mesh 201 to ensure safety.

[0063] The center hole is coaxial and concentric with the pile hole. In this way, the grouting pipe is located in the center of the pile hole after passing through the center hole, ensuring that the lowering of the grouting pipe is smooth enough, and the lowering and lifting of the grouting pipe are convenient.

[0064] Specifically, the grouting pipe includes an upper conduit and a lower conduit. In step 6), when lowering the grouting pipe into the pile hole, the two movable cover plates 202 are first swung outwards away from each other to a fully open state, and then the lower conduit is inserted into the pile hole through the enclosed area. The two movable cover plates 202 are then swung inwards towards each other to a closed state, and the lower conduit is fixed in the center hole.

[0065] The lower conduit has a docking section located above the center hole. The bottom of the upper conduit is docked with the docking section. After the lower conduit and the upper conduit are docked and fixed, a grouting pipe is formed. After the two movable cover plates 202 are swung outwards in opposite directions until they are fully open, the grouting pipe is lowered until the bottom of the grouting pipe is 0.3 to 0.5 meters away from the bottom of the pile hole. Concrete is then poured into the pile hole through the grouting pipe. This facilitates the lowering and positioning of the grouting pipe.

[0066] The long channel steel 210 is provided with a plurality of mounting grooves 211 formed by cutting. The plurality of mounting grooves 211 are arranged at intervals along the extension direction of the long channel steel 210. The mounting grooves 211 on two oppositely arranged long channel steels 210 are relatively aligned. The end plates of the pedals 230 are embedded in the mounting grooves 211, and the bottom of the end of the pedals 230 presses against the mounting grooves 211 from top to bottom.

[0067] The top of the pedal 230 is flush with the top of the long channel steel 210. The long channel steel 210 has through-holes extending front to back. The through-holes extend along the extension direction of the long channel steel 210, and the paths of the through-holes are connected to multiple mounting slots 211. The ends of the pedal 230 have through-holes extending transversely. The through-holes extend along the width direction of the pedal 230. When the ends of the pedal 230 are inserted into the mounting slots 211, the fixing holes 231 and the through-holes are arranged to coincide with each other.

[0068] A fixing tube 240 is fixedly inserted into the through hole, and the fixing tube 240 passes through multiple fixing holes 231 in sequence to relatively fix multiple pedals 230; an elastic sleeve is provided on the outer periphery of the fixing tube 240, and the elastic sleeve is extended along the extension direction of the fixing tube 240, and the elastic sleeve is clamped and fixed in the through hole.

[0069] The fixing tube 240 can effectively fix the pedal 230 to prevent the pedal 230 from loosening and causing the operator to stand unstable when the operator steps on the pedal 230. The design of the elastic sleeve can effectively and completely fix the fixing tube 240, making the connection between the pedal 230 and the fixing tube 240 more compact, further reducing the possibility of vibration or shaking of the pedal 230.

[0070] The outer surface of the elastic sleeve is formed with a surrounding outer ring wall, the outer ring wall abuts against the inner side wall of the through hole, and a plurality of elastic protrusions protrude outward from the outer ring wall. The plurality of elastic protrusions are arranged at intervals along the surrounding direction of the outer ring wall, and the plurality of elastic protrusions are arranged at intervals along the extension direction of the elastic sleeve;

[0071] The inner surface of the elastic sleeve is formed with a surrounding inner ring wall, which encloses a tube passage for the fixed tube 240 to pass through. The outer periphery of the fixed tube 240 abuts against the inner ring wall. The inner ring wall has a plurality of blind holes, each of which has an opening toward the tube passage. The outer periphery of the fixed tube 240 has a plurality of inserting heads 241 extending toward the openings, and the inserting heads 241 completely fill the blind holes.

[0072] The outer surface of the embedding head 241 is semicircular, and the side wall of the blind hole is covered with an adhesive layer 250 formed by resin glue. A positioning hole 2410 formed by a depression is provided on the outer surface of the embedding head 241; when the outer surface of the embedding head 241 abuts against the side wall of the blind hole, the resin glue flows into the positioning hole 2410 under the extrusion of the force, and after the resin glue solidifies, an adhesive layer 250 is formed, and the embedding head 241 is fixed in the blind hole through the adhesive layer 250.

[0073] Through the matching relationship between the embedded head 241 and the blind hole, the elastic sleeve is effectively and stably fixed on the outer periphery of the fixed tube 240 for a long time, avoiding the fixed tube 240 from rotating in the tube channel, resulting in an unstable connection.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for protecting the bored pile hole with steel mesh, characterized in that: The construction steps include: 1) Measure and lay out the lines at the construction site to determine the pile position of the bored pile; bury the casing at the pile position, with the lower part of the casing inserted into the pile position to form an inserted section, and the upper part of the casing exposed above the pile position to form an exposed section. The construction site has a paving area surrounding the outer periphery of the exposed section; 2) Laying ground steel mesh on the laying area; 3) Drilling at the pile position to form a pile hole, wherein the pile hole is located in the area surrounded by the casing, and the top of the exposed section has an opening connected to the pile hole; when the pile hole is drilled to a set depth, a top steel mesh is placed on the top of the exposed section, wherein the top steel mesh covers the opening; 4) Carry out construction on the top steel mesh and measure the thickness of the sediment at the bottom of the pile hole; 5) Move the top steel mesh out of the top of the exposed section, insert the steel cage into the pile hole, and place a grouting frame for fixing the grouting pipe on the top of the exposed section. The grouting frame is provided with a grouting steel mesh on the periphery. The grouting frame and the grouting steel mesh cover the hole opening. 6) Inserting a grouting pipe into the pile hole, the upper portion of the grouting pipe passes through a grouting frame and is relatively fixedly connected to the grouting frame, and pouring concrete into the pile hole through the grouting pipe. After the concrete solidifies in the pile hole, a cast-in-place pile is formed; In step 5), the pouring frame includes two long channel steels arranged opposite to each other, a short channel steel is connected between the ends of the two long channel steels, and the two short channel steels and the two long channel steels enclose a hollow enclosed area; A movable cover is arranged in the middle of the enclosed area, and the movable cover is hinged to swing up and down; the movable cover has a through hole, which passes through the movable cover up and down, and has a semicircular hole opening, two of which are aligned and arranged, and the two through holes are connected to form a central hole for the perfusion tube to pass through; The enclosed area is provided with a plurality of pedals for construction workers to stand on, with both ends of the pedals respectively fixedly connected to two long channel steels, and the plurality of pedals are arranged at intervals along the length direction of the long channel steels, and the plurality of pedals are arranged on both sides of the central hole; The long channel steel is provided with a plurality of mounting grooves formed by cutting, and the plurality of mounting grooves are arranged at intervals along the extension direction of the long channel steel, and the mounting grooves on two oppositely arranged long channel steels are relatively aligned; the end plates of the pedals are embedded in the mounting grooves, and the bottoms of the pedal ends are pressed against the mounting grooves from top to bottom; The top of the pedal is flush with the top of the long channel steel. The long channel steel has a through hole extending front to back. The through hole is arranged along the extension direction of the long channel steel. The path of the through hole is connected to the plurality of mounting slots. The end of the pedal has a through hole extending transversely therethrough, and the through hole extends along the width direction of the pedal. When the end of the pedal is inserted into the mounting groove, the fixing hole and the through hole are arranged to overlap. A fixing tube is fixedly inserted into the through hole, and the fixing tube passes through the plurality of fixing holes in sequence to fix the plurality of pedals relatively. An elastic sleeve is provided on the outer periphery of the fixing tube, and the elastic sleeve is extended along the extension direction of the fixing tube, and the elastic sleeve is clamped and fixed in the through hole.

2. The cast-in-place pile hole steel mesh protection construction method according to claim 1, characterized in that: In the step 2), a protection area where the ground reinforcement mesh is laid and a working area where the ground reinforcement mesh is not laid are formed on the laying area, and a steel plate is laid on the working area; In step 3), the pile hole is constructed using a pile driver; the pile driver is moved to a set position on the steel plate and then drilled into the pile position; after the pile hole is formed, the pile driver is moved outside the working area, the steel plate is removed, and a steel mesh is laid on the working area.

3. The method for protecting the bored pile hole with steel mesh according to claim 1, wherein: Adjacent ground steel meshes are fixedly connected by rope clips; The ground reinforcement mesh includes a plurality of longitudinal reinforcement bars arranged longitudinally and a plurality of transverse reinforcement bars arranged transversely. In one ground reinforcement mesh, the arrangement interval between adjacent longitudinal reinforcement bars is 12 cm, and the arrangement interval between adjacent transverse reinforcement bars is 12 cm.

4. The method for protecting the bored pile hole with steel mesh according to claim 2, wherein: In step 3), after the pile hole is formed during the drilling process using the pile driver, the pile hole is initially cleaned; in step 6), before pouring concrete into the pile hole through the pouring pipe, the air supply pipe is placed into the pouring pipe, and air lift reverse circulation is used for secondary hole cleaning.

5. The cast-in-place pile hole steel mesh protection construction method according to claim 1, characterized in that: In step 5), the cast steel mesh is fixed to the upper surface of the cast frame by welding, the outer periphery of the cast steel mesh is an oval or square ring-shaped steel wire mesh, and the interior of the cast steel mesh is evenly spaced with a plurality of strip-shaped inner steel bars; The middle part of the cast steel mesh has a hollow area in a hollow shape, and the hollow area is arranged to overlap with the two movable cover plates.

6. The method for protecting the bored pile hole with steel mesh according to claim 1, characterized in that: The central hole and the pile hole are coaxial and concentrically arranged.

7. The method for protecting the bored pile hole with steel mesh according to claim 1, characterized in that: The grouting pipe includes an upper conduit and a lower conduit; in step 6), when lowering the grouting pipe into the pile hole, the two movable cover plates are first swung outwards away from each other to a fully open state, the lower conduit is then inserted into the pile hole through the enclosed area, and the two movable cover plates are then swung inwards towards each other to a closed state, and the lower conduit is fixed in the center hole; The lower conduit has a docking section located above the central hole. The bottom of the upper conduit is docked on the docking section. After the lower conduit and the upper conduit are docked and fixed, the grouting pipe is formed; after the two movable cover plates are swung outwards away from each other to a fully open state, the grouting pipe is further lowered until the bottom of the grouting pipe and the bottom of the pile hole are spaced 0.3~0.5m apart, and then concrete is poured into the pile hole through the grouting pipe.

8. The method for protecting the bored pile hole with steel mesh according to any one of claims 5 to 7, characterized in that: The outer surface of the elastic sleeve is formed with a surrounding outer ring wall, the outer ring wall abuts against the inner side wall of the through hole, and the outer ring wall has a plurality of elastic protrusions protruding outward, the plurality of elastic protrusions are arranged at intervals along the surrounding direction of the outer ring wall, and the plurality of elastic protrusions are arranged at intervals along the extension direction of the elastic sleeve; The inner surface of the elastic sleeve is formed with an inner ring wall, the inner ring wall encloses a tube channel for the fixed tube to pass through, and the outer periphery of the fixed tube abuts against the inner ring wall; The inner annular wall is provided with a plurality of blind holes, each of which has an opening toward the tube passage; the outer periphery of the fixed tube is provided with a plurality of inserting heads extending toward the opening, each of which completely fills the blind holes; The outer surface of the embedding head is semicircular, the side wall of the blind hole is covered with an adhesive layer formed by resin glue, and a positioning hole formed by a depression is provided on the outer surface of the embedding head; when the outer surface of the embedding head abuts against the side wall of the blind hole, the resin glue flows into the positioning hole under the extrusion of the force, and after the resin glue solidifies, the adhesive layer is formed, and the embedding head is fixed in the blind hole through the adhesive layer.

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