Sleeve assembly for reinforcing hole wall of pebble covering layer
By using grouting and vibration technology in the casing assembly, the problem of uneven mud penetration in the gravel overburden borehole was solved, achieving efficient reinforcement of the gravel borehole wall and improving the quality of the borehole.
Patent Information
- Application Number
- CN202511742870.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-02-27
AI Technical Summary
In drilling operations in areas with pebble overburden, the drilling mud cannot penetrate deeply into the pores of the pebbles, resulting in low and uneven strength of the retaining wall structure. Large particles of sediment are easily deposited at the bottom of the pile hole after drilling, leading to poor hole quality.
The casing assembly includes a top cover, a bottom cover, and a core. Nano-silicate waterproofing agent is injected through grouting and vibration channels. High-speed spraying and vibration with a vibrator are used to form a uniform reinforcement layer. The core is made of strip core blocks and rubber blocks, which are easy to disassemble and clean.
It enables rapid penetration and uniform distribution of waterproofing agent in the gaps between pebbles, improves the stability of hole wall reinforcement and hole formation quality, and reduces construction difficulty and cost.
Smart Images
Figure CN121575751A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of pile foundation hole construction, and specifically relates to a casing assembly for reinforcing the hole wall of a pebble-covered layer. Background Technology
[0002] The pebble layer is mainly composed of gravel and pebbles of varying sizes, with a lack of effective cementation between the particles. The porosity is as high as 25%-40%, and the permeability coefficient is about 1×10⁻² cm / s. This loose structure makes the borehole wall extremely prone to instability during drilling, leading to problems such as collapse and diameter reduction. In severe cases, it can even cause stuck drill or buried drill accidents, resulting in delays in the construction period and increased construction costs.
[0003] Traditional construction methods employ mud slurry wall protection and casing follow-up. However, when constructing in gravel layers, grouting reinforcement is difficult to achieve due to the large pores of the gravel, which prevents the mud slurry from penetrating deeply and easily leads to slurry loss. As a result, it is difficult to form a uniform and stable reinforcement layer. This causes problems such as low structural strength, unstable effect, long drilling cycle, and complex equipment for mud slurry wall protection. Furthermore, a large amount of sediment will remain at the bottom of the hole after drilling. Since the drilling depth required for strongly developed landforms is large, the traditional method of flushing the bottom of the hole with grouting pipes to cause mud slurry backflow will cause large particles of sediment to fall back midway and the hole wall to detach, affecting the final drilling quality.
[0004] Patent document with application number "CN2016100943052" discloses a method for drilling and re-drilling concrete retaining walls for rock-embedded piles in karst areas. This method primarily involves constructing plain concrete bored piles within the overlying soil layer. These piles consist of thin-walled concrete cylindrical piles with retaining walls and solid cored concrete piles located within the thin-walled concrete cylindrical piles. The diameter of the plain concrete bored piles is larger than the borehole diameter of the underlying bedrock-embedded piles, and the pile length is the depth from the natural ground surface to the top of the underlying bedrock. After the concrete in the pile body reaches an age of 3-7 days, a rotary drilling rig is used to extract the core from the plain concrete bored piles. The solid cored concrete piles are then removed, and a re-drilled concrete retaining wall structure is formed by the thin-walled concrete cylindrical piles with retaining walls. This allows the underlying bedrock to be exposed, and the drilling of the underlying bedrock-embedded piles can then be carried out within the bedrock strata. However, this method still relies on traditional mud-slurry retaining walls, and therefore still suffers from problems such as the difficulty in forming a uniform reinforcement layer, long drilling cycles, and unstable reinforcement.
[0005] The above background information is provided only to aid in understanding the inventive concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention
[0006] The purpose of this invention is to provide a casing assembly for reinforcing the borehole wall in a pebble overburden layer, thereby overcoming the shortcomings of traditional methods in drilling in geological areas with strong karst development under thick pebble overburden layers, where the mud cannot penetrate deep into the pebble voids and is easily lost, resulting in low and uneven strength of the retaining wall structure, large particles of sediment falling into the bottom of the pile hole after drilling, and poor hole quality.
[0007] To achieve the above objectives, the present invention provides a casing assembly for reinforcing the borehole walls of a pebble-covered layer, comprising: a top cover, a bottom cover, and a core; a grouting channel and a vibration channel are provided at both ends of the core, one side of the vibration channel being connected to the outside of the core; the top cover is detachably fitted over one end of the core and has a grouting hole and a vibration hole, the grouting hole being connected to one end of the grouting channel, and the vibration hole being connected to one end of the vibration channel; the bottom cover is detachably fitted over the other end of the core and is capable of sealing the other end of the grouting channel and the other end of the vibration channel; a grout passage is connected between the grouting channel and the vibration channel.
[0008] Preferably, in the above technical solution, the top of the top cover is provided with a baffle, the baffle is provided with a lifting ring, and the number of vibration channels is two or more and they are evenly arranged around the grouting channel with the grouting channel as the center.
[0009] Preferably, in the above technical solution, the core is composed of strip-shaped core blocks and rubber blocks. Each strip-shaped core block and each rubber block is alternately arranged around the grouting channel with the axis of the grouting channel as the center. The strip-shaped core blocks are fixedly connected by a first locking bolt. The side of the strip-shaped core block near the grouting channel is provided with a first arc surface, and the side of the rubber block near the grouting channel is provided with a first side surface. The sidewall of the grouting channel is formed by the first arc surface and the first side surface.
[0010] Preferably, in the above technical solution, the rubber block has a second side surface on the side away from the grouting channel, and the grout passage hole penetrates the first side surface and the second side surface; arc-shaped grooves are respectively opened on both sides of the strip core block, and the arc-shaped grooves penetrate both ends of the strip core block; the sidewall of the vibration channel is formed by the second side surface and the two arc-shaped grooves.
[0011] Preferably, in the above technical solution, the strip core block has a weight-reducing cavity inside, and a second arc surface is provided on the side of the strip core block away from the grouting channel. A plurality of first support columns and second support columns are provided in the weight-reducing cavity. One end of the first support column and one end of the second support column intersect each other and are fixedly connected to the inner side of the weight-reducing cavity corresponding to the second arc surface. The other ends of the first support columns and the other ends of the second support columns are far apart from each other and are fixedly connected to the inner sidewalls on both sides of the weight-reducing cavity.
[0012] Preferably, in the above technical solution, the first support column has a first through-hole, the two ends of which penetrate one side of the strip core block and the second arc surface. The second support column has a first threaded hole, one end of which extends outward from the other side of the strip core block. A second through-hole is provided through both sides of the strip rubber block, the second through-hole and the slurry through-hole are staggered. The first through-hole, the second through-hole and the first threaded hole are coaxial. The threaded end of the first locking bolt can pass through the first through-hole and the second through-hole and be threadedly connected to the first threaded hole.
[0013] Preferably, in the above technical solution, a reinforcing beam is also provided in the weight reduction cavity. The reinforcing beam is located near both ends of the strip core block. A second threaded hole is provided on the reinforcing beam. The top cover and the bottom cover are respectively fixedly connected to the ends of the strip core block by a second locking bolt. The second locking bolt is threadedly connected to the second threaded hole.
[0014] Preferably, in the above technical solution, a first rubber seat is provided between one end of the core and the top cover. The first rubber seat is provided with a first sleeve and a second sleeve. One end of the first sleeve passes through the grouting hole and extends upward to the top cover. The other end of the first sleeve can extend into the grouting channel and has a gap with the inner wall of the grouting channel. One end of the second sleeve passes through the vibration hole and extends upward to the top cover. The other end of the second sleeve extends into the vibration channel.
[0015] Preferably, in the above technical solution, a second rubber seat is provided between the other end of the core and the bottom cover, and the second rubber seat is provided with a rubber plug, which is inserted into the vibration channel.
[0016] Preferably, in the above technical solution, a sleeve is provided inside the bottom cover. The sleeve can extend from the other end of the grouting channel into the grouting channel and move closer to the other end of the first sleeve. There is a gap between the outer side of the sleeve and the inner wall of the grouting channel.
[0017] Compared with existing technologies, the present invention has the following advantages: 1. The sleeve assembly for reinforcing the hole walls of the pebble covering layer in this invention can connect the grouting channel to the grouting pipe and inject nano-silicate waterproofing agent. The grouting hole can spray the waterproofing agent at high speed onto the hole wall of the guide hole, allowing the waterproofing agent to penetrate into the gaps between the pebbles. The outer wall of the core is close to the hole wall of the guide hole, and the top and bottom covers can provide a certain degree of sealing in this area, thereby enabling rapid pressure increase to expand the penetration range of the waterproofing agent. The vibration channel is used to insert a vibrator and can pull it upward to vibrate the waterproofing agent in the pebble gaps, improving the uniformity of the waterproofing agent in the gaps.
[0018] 2. The core of this invention is composed of strip-shaped core blocks and strip-shaped rubber blocks. Its detachable structure, compared with the integral structure, not only facilitates transportation and stacking after the casing is disassembled, but also allows for disassembly after use to thoroughly clean the grouting channel and vibration channel. The strip-shaped rubber blocks not only serve as a seal, but the grout passage holes are also located on the strip-shaped rubber blocks. Due to the elasticity of rubber, it can further prevent the silicate waterproofing agent on the inner wall of the grout passage holes, grouting channel, and vibration channel from solidifying.
[0019] 3. In this invention, the strip core block has a weight-reducing cavity inside, which can reduce the overall weight of the sleeve assembly, thereby reducing both cost and construction difficulty. The first and second support columns set in the weight-reducing cavity can not only support and strengthen the structure of the weight-reducing cavity, but also be used to open the first through-hole and the second arc, which facilitates the installation of the first locking bolt and increases its connection strength.
[0020] 4. The top cover of the present invention is provided with a baffle on its outer periphery, which not only supports the opening of the guide hole, but also improves the sealing between the outer wall of the core and the wall of the guide hole. The top cover and the bottom cover are detachable and replaceable, and the top cover and the bottom cover with different outer diameters can be flexibly customized according to the requirements of different guide holes, so that it has good versatility.
[0021] 5. The first rubber seat and the second rubber seat in this invention can seal the weight-reducing cavity of the strip core block to prevent silicate waterproofing agent from entering the weight-reducing cavity. The first rubber seat is provided with a first sleeve and a second sleeve, both of which are made of the same material as the first rubber seat. When the grouting pipe and the vibrator are installed, the sealing effect of the grouting channel and the end of the vibrating channel can be improved.
[0022] 6. The bottom cover of the present invention is provided with a sleeve rod, which can extend into the grouting channel and approach the other end of the first sleeve, forming an annular structure chamber with the grouting channel. This not only reduces the actual internal volume of the grouting channel and the amount of nano-silicate waterproofing agent used during construction, thus reducing waste, but also increases the flow rate of the waterproofing agent and shortens the response time of the injection through the grouting hole by reducing the cross-sectional area of the waterproofing agent in the grouting channel. Attached Figure Description
[0023] Figure 1 This is a structural diagram of a casing assembly for reinforcing the hole walls of a pebble cover layer according to the present invention.
[0024] Figure 2 This is a partial cross-sectional view of the bushing assembly.
[0025] Figure 3 This is a structural diagram of the top cover.
[0026] Figure 4 This is a structural diagram of the core.
[0027] Figure 5 This is a partial cross-sectional view of the strip core block.
[0028] Figure 6 This is a structural diagram of a strip-shaped rubber block.
[0029] Figure 7 This is a structural diagram of the first rubber seat.
[0030] Figure 8 This is a structural diagram of the casing assembly after the vibrator and grouting pipe are assembled.
[0031] Explanation of key figure labels: 100-Top cover, 110-Grouting hole, 120-Vibration hole, 130-Baffle, 140-Lifting ring; 200-bottom cover; 300-Core, 310-Grouting channel, 320-Vibration channel, 330-Grouting hole, 340-Strip core block, 341-First arc surface, 342-Arc groove, 343-Second arc surface, 350-Rubber block, 351-First side, 352-Second side, 353-Second nail hole, 360-Weight reduction cavity, 361-First support column, 362-Second support column, 363-First nail hole, 364-First threaded hole, 370-First locking bolt, 380-Reinforcing beam, 381-Second threaded hole, 382-Second locking bolt; 400 - First rubber seat, 410 - First sleeve, 420 - Second sleeve; 500 - Second rubber seat, 510 - Rubber plug, 520 - Sleeve rod; 600-Grouting pipe; 700-Vibrating rod. Detailed Implementation
[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0033] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "top surface," "bottom surface," "inner," "outer," "inner side," and "outer side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0034] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.
[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.
[0036] like Figures 1 to 7As shown, the casing assembly for reinforcing the hole walls of the pebble cover layer in this embodiment includes: a top cover 100, a grouting hole 110, a vibration hole 120, a baffle 130, a lifting ring 140, a bottom cover 200, a core 300, a grouting channel 310, a vibration channel 320, a grout passage hole 330, a strip-shaped core block 340, a first arc surface 341, an arc-shaped groove 342, a second arc surface 343, a rubber block 350, and a first side surface 351. Second side 352, second through-hole 353, weight reduction cavity 360, first support column 361, second support column 362, first through-hole 363, first threaded hole 364, first locking bolt 370, reinforcing beam 380, second threaded hole 381, second locking bolt 382, first rubber seat 400, first sleeve 410, second sleeve 420, second rubber seat 500, rubber plug 510, sleeve bar 520.
[0037] The core 300 contains one grouting channel 310 and three vibration channels 320. The three vibration channels 320 are evenly arranged around the grouting channel 310, with the two ends of the grouting channel 310 and the vibration channels 320 passing through both ends of the core 300. The core 300 is composed of three strip-shaped core blocks 340 and three rubber blocks 350. Each strip-shaped core block 340 and rubber block 350 is alternately arranged around the grouting channel 310 with the axis as the center. The rubber blocks 350 are sandwiched between the strip-shaped core blocks 340 and are fixedly connected between the strip-shaped core blocks 340 by a first locking bolt 370. The strip-shaped core blocks 340 are close to the grouting channel. A first arc surface 341 is provided on one side of the grouting channel 310. A first side surface 351 is provided on the side of the rubber block 350 near the grouting channel 310. The sidewall of the grouting channel 310 is enclosed by the first arc surface 341 and the first side surface 351. A second side surface 352 is provided on the side of the rubber block 350 away from the grouting channel 310. A grout passage hole 330 is opened through the first side surface 351 and the second side surface 352. Arc-shaped grooves 342 are respectively opened on both sides of the strip core block 340, and the arc-shaped grooves 342 pass through both ends of the strip core block 340. The sidewall of the vibration channel 320 is enclosed by the second side surface 352 and the two arc-shaped grooves 342. The grout passage hole 330... The grouting channel 310 is connected to the side of the vibration channel 320; a second arc surface 343 is provided on the side of the strip core block 340 away from the grouting channel 310, and the bending direction of the second arc surface 343 is consistent with the bending direction of the first arc surface 341, so that the cross-section of the strip core block 340 is a fan-shaped structure; the top cover 100 and the bottom cover 200 are respectively fixed to the two ends of the core body 300 by the second locking bolts. A baffle 130 is provided on the outer periphery of the top of the top cover 100, and two lifting rings 140 are symmetrically installed on the baffle 130. A grouting hole 110 and a vibration hole 120 are opened through the top of the top cover 100, and the grouting hole 110 is connected to the grouting channel 310. One end of the core 300 corresponds to and is connected to the top cover 100; the vibrating hole 120 corresponds to and is connected to one end of the vibrating channel 320; the first rubber seat 400 is installed between one end of the core 300 and the top cover 100; a first sleeve 410 and a second sleeve 420 are provided on the first rubber seat 400; one end of the first sleeve 410 passes through the grouting hole 110 and extends upward to the top cover 100; the other end of the first sleeve 410 can extend into the grouting channel 310 and has a gap between it and the inner wall of the grouting channel 310; one end of the second sleeve 420 passes through the vibrating hole 120 and extends upward to the top cover 100; the other end of the second sleeve 420 extends into the vibrating channel 320.A second rubber seat 500 is installed between the other end of the core 300 and the bottom cover 200. The second rubber seat 500 is equipped with a rubber plug 510. The position of the rubber plug 510 corresponds to the position of the vibration channel 320 and can be inserted into the vibration channel 320 from its end. A sleeve 520 is provided in the middle of the bottom cover 200. The end of the sleeve 520 can pass through the second rubber seat 500 and extend into the grouting channel 310 from its other end, approaching the other end of the first sleeve 410. The sleeve 520 is coaxially arranged with the grouting channel 310, and there is a gap between the outer side of the sleeve 520 and the inner wall of the grouting channel 310.
[0038] In addition, multiple first support columns 361 and second support columns 362 are provided inside the weight reduction cavity 360. The first support columns 361 and second support columns 362 are spaced apart along the length direction of the strip core block 340. One end of the first support column 361 and one end of the second support column 362 intersect each other and are fixedly welded to the inner side of the weight reduction cavity 360 corresponding to the second arc surface 343. The other ends of the first support columns 361 and the other ends of the second support columns 362 are far apart from each other and are fixedly welded to the inner side walls of both sides of the weight reduction cavity 360. A first through-hole 363 is provided in the first support column 361, and the two ends of the first through-hole 363 penetrate one side of the strip core block 340 and the second arc surface 343. A first threaded hole 364 is provided in the second support column 362. One end of 4 extends outward from the other side of the strip core block 340; a second through-hole 353 is provided through both sides of the strip rubber block 350, the second through-hole 353 and the through-hole 330 are staggered, the first through-hole 363, the second through-hole 353 and the first threaded hole 364 are coaxial, the threaded end of the first locking bolt 370 can pass through the first through-hole 363 and the second through-hole 353 and be threadedly connected to the first threaded hole 364, a reinforcing beam 380 is also welded in the weight reduction cavity 360, the reinforcing beam 380 is located close to both ends of the strip core block 340, a second threaded hole 381 is provided on the reinforcing beam 380, the second locking bolt is threadedly connected to the second threaded hole 381, thereby fixing the top cover 100 and the bottom cover 200 to the end of the core 300.
[0039] To enable those skilled in the art to better understand this technical solution, the following further describes the method of using the casing assembly for reinforcing the hole wall of the pebble cover layer in this embodiment: In use, first drill a pilot hole in the gravel cover layer. The diameter of the pilot hole is larger than the diameter of the pile foundation hole. Then, insert the entire casing assembly into the pilot hole, so that the baffle 130 rests at the opening of the pilot hole. Then, as... Figure 8As shown, the grouting pipe 600 is inserted into the first sleeve 410 and extends into the grouting channel 310, and the vibrator 700 is inserted into the second sleeve 420 and can move up and down along the vibration channel 320.
[0040] During grouting, the vibrator 700 is first pulled up to its highest position to expose the grout passage 330. Then, nano-silicate waterproofing agent is injected into the grouting channel 310 through the grouting pipe 600, allowing the waterproofing agent to penetrate into the gaps between the pebbles. Next, the vibrator 700 is opened and placed at the bottom and slowly pulled upwards to expel air bubbles in the waterproofing agent, making the waterproofing agent penetrate more evenly. Finally, after a period of static pressure holding, the entire casing assembly is pulled out, thereby forming a reinforced structure inside the guide hole wall on the pebble cover layer.
[0041] In summary, the sleeve assembly for reinforcing the hole walls of the pebble covering layer in this embodiment can connect the grouting channel 310 to the grouting pipe 600 and inject nano-silicate waterproofing agent. The grouting hole 330 can spray the waterproofing agent at high speed onto the hole wall of the guide hole, allowing the waterproofing agent to penetrate into the gaps between the pebbles. The outer wall of the core 300 is close to the hole wall of the guide hole, and the top cover 100 and bottom cover 200 can provide a certain degree of sealing in this area, thereby enabling rapid pressure increase to expand the penetration range of the waterproofing agent. The vibration channel 320 is used to insert the vibrator 700 and can pull it upward to vibrate the waterproofing agent in the pebble gaps, improving the uniformity of the waterproofing agent in the gaps.
[0042] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the invention and are protected by patent law.
Claims
1. A casing assembly for reinforcing the pore walls of a pebble-covered layer, characterized in that, include: The system comprises a top cover, a bottom cover, and a core. A grouting channel and a vibration channel are provided at both ends of the core. One side of the vibration channel is connected to the outside of the core. The top cover is detachably fitted over one end of the core and has a grouting hole and a vibration hole. The grouting hole is connected to one end of the grouting channel, and the vibration hole is connected to one end of the vibration channel. The bottom cover is detachably fitted over the other end of the core and can seal the other ends of the grouting channel and the vibration channel. A grout passage is connected between the grouting channel and the vibration channel.
2. The sleeve assembly for reinforcing the hole walls of a pebble-covered layer according to claim 1, characterized in that, The top of the cover is provided with a baffle, and the baffle is provided with a hanging ring. The number of vibration channels is two or more, and they are evenly arranged around the grouting channel with the grouting channel as the center.
3. The sleeve assembly for reinforcing the hole walls of a pebble-covered layer according to claim 1, characterized in that, The core is composed of strip-shaped core blocks and rubber blocks. Each strip-shaped core block and each rubber block is alternately arranged around the grouting channel with the axis of the grouting channel as the center. The strip-shaped core blocks are fixedly connected by a first locking bolt. The side of the strip-shaped core block near the grouting channel is provided with a first arc surface, and the side of the rubber block near the grouting channel is provided with a first side surface. The sidewall of the grouting channel is formed by the first arc surface and the first side surface.
4. The sleeve assembly for reinforcing the hole walls of a pebble-covered layer according to claim 3, characterized in that, The rubber block has a second side surface on the side away from the grouting channel, and the grouting hole passes through the first side surface and the second side surface; the strip core block has arc-shaped grooves on both sides, and the arc-shaped grooves pass through both ends of the strip core block; the side wall of the vibration channel is formed by the second side surface and the two arc-shaped grooves.
5. The casing assembly for reinforcing the hole walls of a pebble-covered layer according to claim 4, characterized in that, The strip core block has a weight-reducing cavity inside. The side of the strip core block away from the grouting channel has a second arc surface. Several first support columns and second support columns are provided in the weight-reducing cavity. One end of the first support column and one end of the second support column intersect each other and are fixedly connected to the inner side of the weight-reducing cavity corresponding to the second arc surface. The other ends of the first support column and the other ends of the second support column are far apart from each other and are fixedly connected to the inner sidewalls on both sides of the weight-reducing cavity.
6. The casing assembly for reinforcing the hole walls of a pebble-covered layer according to claim 5, characterized in that, The first support column has a first through-hole, the two ends of which penetrate one side of the strip core block and the second arc surface. The second support column has a first threaded hole, one end of which extends outward from the other side of the strip core block. A second through-hole is provided through both sides of the strip rubber block. The second through-hole is offset from the through-hole. The first through-hole, the second through-hole and the first threaded hole are coaxial. The threaded end of the first locking bolt can pass through the first through-hole and the second through-hole and be threadedly connected to the first threaded hole.
7. The casing assembly for reinforcing the hole walls of a pebble-covered layer according to claim 5, characterized in that, The weight reduction cavity is also provided with a reinforcing beam, which is located near both ends of the strip core block. A second threaded hole is provided on the reinforcing beam. The top cover and the bottom cover are respectively fixedly connected to the ends of the strip core block by a second locking bolt, and the second locking bolt is threadedly connected to the second threaded hole.
8. The casing assembly for reinforcing the hole walls of a pebble-covered layer according to claim 1, characterized in that, A first rubber seat is provided between one end of the core and the top cover. The first rubber seat is provided with a first sleeve and a second sleeve. One end of the first sleeve passes through the grouting hole and extends upward to the top cover. The other end of the first sleeve can extend into the grouting channel and has a gap between it and the inner wall of the grouting channel. One end of the second sleeve passes through the vibration hole and extends upward to the top cover. The other end of the second sleeve extends into the vibration channel.
9. The casing assembly for reinforcing the hole walls of a pebble-covered layer according to claim 8, characterized in that, A second rubber seat is provided between the other end of the core and the bottom cover. The second rubber seat is provided with a rubber plug, which is inserted into the vibration channel.
10. The casing assembly for reinforcing the hole walls of a pebble-covered layer according to claim 8, characterized in that, The bottom cover is provided with a sleeve rod, which can extend from the other end of the grouting channel into the grouting channel and move towards the other end of the first sleeve. There is a gap between the outer side of the sleeve rod and the inner wall of the grouting channel.