Height-adjustable inner and outer cylinder nested filling and pouring device and use method thereof

Abstract

The application discloses a highly-adjustable inner-outer cylinder nested filling pouring device and a use method thereof, and belongs to the field of coal mine roadway filling support. The device comprises two symmetrical half-circular inner cylinder frames, two symmetrical half-circular outer cylinder frames, and a lower support platform connected to the bottom of the half-circular outer cylinder frame. The two half-circular inner cylinder frames are combined into a whole inner cylinder, the two half-circular outer cylinder frames are combined into a whole outer cylinder, and the two half-circular outer cylinder frames are fixedly connected through the pull ring type buckles arranged on the surfaces. Then, the combined half-circular inner cylinder frame is embedded into the fixed outer cylinder frame, that is, the two groups of filling frames are combined and assembled to form the inner-outer cylinder nested filling pouring device. The inner-outer cylinder provided by the application is a left-right symmetrical combined and assembled mold, can be mass-produced, is convenient to disassemble, transport and maintain, and can be adjusted in overall size according to actual engineering requirements, so as to adapt to different mine working conditions and improve production efficiency.

Description

Technical Field

[0001] This invention relates to a height-adjustable nested inner and outer cylinder filling and casting device and its usage method, belonging to the field of coal mine roadway filling and support. Background Technology

[0002] With the increasing depth of coal mining, roadway support has become a key factor restricting the safe and efficient production of coal mines. During coal mining, roadways serve as channels for coal transportation and personnel passage, and their stability directly affects the safety and efficiency of coal mine production. To recover more coal resources, increase the underground coal recovery rate, reduce the high support pressure on adjacent coal seams and floor roadways caused by wide coal pillars, and reduce the occurrence of rockbursts, goaf-side roadway retention has become a commonly used layout method in coal mining. Goaf-side roadway retention involves arranging roadways in the support pressure reduction zone near the goaf. Through the cyclical utilization of roadways, it can not only effectively improve the coal resource recovery rate, reduce the roadway excavation rate, and alleviate the tension in mining succession, but also significantly reduce the incidence of underground disasters caused by the presence of coal pillars.

[0003] Meanwhile, gob-side roadway retention places higher demands on support methods, typically employing gob-filling and roof-cutting pressure relief techniques. Current technology generally uses gob-side roadway support with filling, usually by pouring concrete onto the side of the roadway closest to the gob, forming a support structure with a certain thickness and strength. This isolates the gob-side roadway from the gob, stabilizing the surrounding rock. The roadway-side support filling columns can support the roof load at the edge of the collapse zone, sharing and reducing the load on the roadway's supports, preventing severe deformation of the original support structure. Under conditions of severe periodic pressure or hard, non-collapseable roofs, the roadway-side support acts as a roof-cutting mechanism, ensuring the smooth collapse of the gob's roof. Currently, the most common gob-side roadway filling method is concrete pouring, which has proven to be widely adaptable and have high load-bearing capacity. Therefore, using materials such as concrete grout to form filling column support along the roadway is of great significance for ensuring roadway stability and preventing safety accidents, and has a profound impact on improving the overall safety and economic benefits of coal mining. Summary of the Invention

[0004] The present invention aims to provide a height-adjustable inner and outer cylinder nested filling and casting device and its usage method, which can complete the casting of circular filling columns of different heights and sizes, and provides a solution for the stability during the casting of circular filling columns and subsequent protection.

[0005] The design starting point of this invention is as follows: (1) Both the inner and outer cylinders are designed as symmetrically fitted molds with a high degree of fitting, which facilitates filling and support operations in the well. Both the inner and outer cylinders are designed as detachable molds, which facilitates transportation from the ground to the well and improves work efficiency. (2) Before filling and support operations, the molds can be quickly assembled by fasteners and other fixed structures, saving time and manpower. During filling and support operations, the hydraulic device will provide support for the molds, preventing problems such as mold detachment and unsolidified slurry leakage in harsh working conditions or strong vibration environments, thus improving the stability of filling and support operations. (3) The height of the circular filling column can be adjusted by adjusting the relative position of the inner and outer cylinders and the opening and closing of the metal buckle and the arc groove of the inner cylinder, which flexibly realizes the casting and support tasks and reduces costs.

[0006] This invention provides a height-adjustable nested inner and outer cylinder filling and casting device, comprising two symmetrically fitted semi-circular inner cylinder frames and two symmetrically fitted semi-circular outer cylinder frames, with a lower support platform connected to the bottom of the semi-circular outer cylinder frames; the two semi-circular outer cylinder frames are fixedly connected by pull ring buckles on their surfaces, and then the fitted semi-circular inner cylinder frames are embedded into the fixed outer cylinder frames, that is, the aforementioned semi-circular inner cylinder frames and semi-circular outer cylinder frames are assembled to form a nested inner and outer cylinder filling and casting device.

[0007] The hollow cylinder formed by the inner and outer cylinder frames can fit tightly together, and the inner and outer cylinders have good sealing performance after being fitted and assembled, which can prevent the filling grout from seeping in; the nested inner and outer cylinder filling and casting device can form a cavity-type filling and casting frame. A casting port is provided at the upper end of the inner cylinder, and the filling grout is poured into the cavity through the casting port.

[0008] The inner cylindrical frame is equipped with an upper cover frame at the top;

[0009] Hydraulic devices are connected to the left and right sides of the lower support platform. Each hydraulic device includes a hydraulic cylinder connected to a hydraulic rod, which in turn connects to an upper metal clip. The opening and closing of the metal clip is controlled by the lifting and lowering of the hydraulic device. Specifically, bolt holes are provided on the left and right sides of the lower support platform. These holes are aligned with the bottom of the hydraulic cylinder and connected by bolts. Simultaneously, the bolt holes at the top of the hydraulic rod are aligned with the bolt holes at the bottom of the metal clip and connected by bolts. With this configuration, during the adjustment of the inner cylinder height, the lifting and lowering of the hydraulic device controls the engagement or disengagement of the metal clip with the arc-shaped groove of the inner cylinder, thus fixing the position of the inner cylinder.

[0010] Furthermore, the two semi-circular inner cylinder frames are combined to form the entire inner cylinder frame, which is a cylindrical structure composed of two semi-circular cylinder structures. One end of the semi-circular cylinder structure has a raised arc-shaped strip, and the other end has an arc-shaped groove that matches the arc-shaped strip. The arc-shaped strip and arc-shaped groove of the two semi-circular cylinder structures are fitted together to symmetrically fit the two semi-circular cylinders together; the outer wall of the entire inner cylinder frame is uniformly provided with inner cylinder arc-shaped grooves.

[0011] The arc-shaped strips and arc-shaped grooves of the left and right semi-circular inner cylinder frames can achieve a tight corresponding fit; each semi-circular inner cylinder frame has several inner cylinder arc-shaped grooves evenly distributed on its outer wall; during the design, the spacing between adjacent inner cylinder arc-shaped grooves is the same.

[0012] Furthermore, the upper cover frame is a hollow frustum structure, which is composed of two semi-circular frustum structures. Each semi-circular frustum structure has a raised arc-shaped strip at one end and an arc-shaped groove matching the arc-shaped strip at the other end. The arc-shaped strips and arc-shaped grooves of the two semi-circular frustum structures are fitted together to form a complete upper cover frame. A curved groove is provided on the outer side of the upper cover frame, and a ring of arc-shaped protruding ridges is provided on the inner side to facilitate its engagement with the first arc-shaped groove at the top of the inner cylinder.

[0013] After the two semi-circular inner cylinder frames are assembled, an upper cover frame is added to the top of the inner cylinder frames. This upper cover frame is a symmetrically fitted and assembled type. For this set of symmetrically fitted and assembled upper cover frames, the arc-shaped strips and arc-shaped grooves of the left and right halves of the upper cover frame can achieve a tight fit. During assembly, the arc-shaped protrusions on the inner side of this set of upper cover frames are engaged with the first set of grooves at the top of the outer wall of the inner cylinder. The inner side of the upper cover frame has protruding arc-shaped protrusions that are the same size as the arc-shaped grooves of the inner cylinder filling the outer wall of the semi-circular inner cylinder frame, which can achieve a tight fit. Adding an upper cover frame to the top of the outer wall of the inner cylinder frame can increase the contact area when actually contacting the top plate, making the actual connection to the top more compact.

[0014] Furthermore, the two semi-circular outer cylindrical frames are combined to form the entire outer cylinder, which is a cylindrical structure composed of two semi-circular cylindrical structures. One end of each semi-circular cylindrical structure has a raised arc-shaped strip, and the other end has an arc-shaped groove that matches the arc-shaped strip. The two semi-circular cylinders are symmetrically combined to form the outer cylinder by fitting the arc-shaped strip and the arc-shaped groove together. Two bolt holes are provided on the upper part of the semi-circular outer cylindrical frame for connecting metal buckles. Pull-ring type hooks are provided on the lower part of the semi-circular outer cylindrical frame. Hooks are fixed at the upper and lower ends of the left semi-circular outer cylindrical frame, and pull rings, locks, and lock curved cover plates are fixed at the upper and lower ends of the right semi-circular outer cylindrical frame. The components of the pull-ring type hooks are fixed to the semi-circular outer cylindrical frame with bolts.

[0015] The left and right semi-circular outer cylindrical frames and their attached lower support platforms can be tightly fitted together via curved strips and grooves. After the outer cylindrical frame with the attached lower support platform is assembled, the symmetrically distributed pull-ring buckles on both ends of the outer cylindrical frame can be manually fastened.

[0016] Furthermore, the structure of the aforementioned pull-ring type hook-and-loop fastener includes a pull ring and hook, a latch and a latch curved cover plate, which are fixed by a spring and bolt locking mechanism. The latch curved cover plate can rotate on the latch by a pivot. The pull ring structure can be nested inside the latch curved cover plate and rotate. After the arc strips of the left and right semi-circular outer cylindrical frames are engaged with the arc grooves, the latch curved cover plate on the right semi-circular outer cylindrical frame is opened, and the pull ring on the cover plate is fastened to the hook on the left semi-circular outer cylindrical frame, thus completing the fastener fixation. A spring is provided inside the latch curved cover plate, which automatically rebounds when the latch curved cover plate is opened and flipped up. To further ensure that the fastener can be firmly fastened under harsh working conditions or strong vibration environments, and to prevent problems such as the latch curved cover plate coming undone, hexagonal bolts are used to fix the latch, and the pull-ring type hook-and-loop fasteners symmetrically distributed at both ends of the semi-circular outer cylindrical frame are fixed by a spring and bolt locking mechanism.

[0017] Furthermore, symmetrically distributed metal clips are installed on the inner side of the top of the semi-circular outer cylindrical frame along the axis of the cylinder. These metal clips are made of carbon steel, possessing good load-bearing strength and durability against corrosion. The metal clips are structured as arc-shaped blocks, with an outer arc-shaped plate. Two parallel convex ridges are vertically connected to the upper part of the arc-shaped plate, and a base plate is vertically connected to the lower part. The two parallel convex ridges match the dimensions of the arc-shaped grooves on the inner cylinder, allowing for horizontal engagement. When adjusting the metal clips, they are inserted into the arc-shaped grooves of the inner cylinder at different heights, thus fixing the inner cylinder at the desired height and achieving an adjustable height for the filling and pouring device.

[0018] The metal buckle has a connecting block at the bottom of its base plate, with a bolt hole in the center for connecting and fixing to the outer cylinder frame. A bolt hole is also provided below the metal buckle base plate for connecting a hydraulic rod. The metal buckle protrusions are threaded to increase the roughness of the contact surface, thereby increasing the tightness of the metal buckle's engagement with the inner cylinder's arc-shaped groove.

[0019] For ease of assembly, the metal clips have two sets of bolt holes: the first set is located on the inside of the metal clip and at the top of the outer cylinder frame, for connecting the outer cylinder frame; the second set is located on the bottom of the metal clip and at the top of the hydraulic rod, for connecting the hydraulic rod; a third set of bolt holes is located at the bottom of the hydraulic cylinder and on the surface of the lower support platform, for connecting the two. After aligning all sets of bolt holes, secure them with hexagonal bolts.

[0020] Furthermore, hydraulic devices are installed on the left and right sides of the lower support platform, with bolt holes distributed throughout. The hydraulic devices consist of a hydraulic cylinder at the bottom and a hydraulic rod at the top. The lifting and lowering of the hydraulic device is achieved by adjusting the oil inlet and outlet of the hydraulic cylinder and hydraulic rod. The bolt holes at the bottom of the hydraulic cylinder can be aligned with the bolt holes on both sides of the platform and secured with hexagonal bolts; the bolt holes at the top of the hydraulic rod can be aligned with the bolt holes at the bottom of the metal clips and secured with hexagonal bolts. In other words, by adjusting the oil inlet and outlet of the hydraulic cylinder and hydraulic rod, the lifting and lowering of the hydraulic device is controlled, thereby adjusting the engagement or disengagement of the metal clips with the arc-shaped grooves of the inner cylinder at different heights, ultimately achieving adjustable height for the filling and pouring device.

[0021] Furthermore, a rubber gasket is placed on top of the outer cylinder. The inner and outer diameters of the rubber gasket are equal to those of the outer cylinder. When placed on top of the outer cylinder, the ring formed by the rubber gasket fits tightly against the outer surface of the inner cylinder. After assembling the upper cover frame and the inner cylinder, the entire assembly is placed into the outer cylinder from top to bottom until the bottom of the upper cover frame and the top of the outer cylinder clamp the rubber gasket. Adding the rubber gasket reduces grout leakage and prevents filling grout from seeping into the gaps in the device.

[0022] The metal buckle protrusions are threaded, which increases the roughness of the contact surface and increases the tightness of the subsequent engagement with the inner cylinder's arc-shaped groove; the outer side of the upper cover frame is provided with a curved groove, and the surface of the metal buckle is provided with a curved groove, which increases the surface roughness to prevent slipping during installation by the operator.

[0023] Furthermore, the height-adjustable inner and outer cylinder nested filling and pouring device is made of three materials: stainless steel 304, carbon steel, and iron. Among them, the semi-circular inner cylinder frame, the lower support platform, the semi-circular outer cylinder frame, and the upper cover platform frame are made of iron; the pull ring buckle and the metal buckle are made of carbon steel; the hexagonal bolts required to fix the pull ring buckle, the hexagonal bolts required to fix the bottom of the hydraulic cylinder of the hydraulic device to the lower support platform, the hexagonal bolts required to fix the top of the hydraulic rod of the hydraulic device to the metal buckle, and the hexagonal bolts required to fix the metal buckle to the outer cylinder have different diameters. All the hexagonal bolts used in this invention are made of stainless steel 304.

[0024] This invention provides a method for using the above-mentioned height-adjustable inner and outer cylinder nested filling and casting device, comprising the following steps:

[0025] (1) Determine design parameters and requirements: First, based on the specific design parameters and requirements of the project (such as mine type, mining method, roadway width, roof and floor height), determine the diameter, height and other parameters of the filling body, as well as the required filling material type and performance indicators;

[0026] (2) Based on the engineering measurement calculations and the actual mold placement location, the mold is transported to the goaf-retention roadway and assembled. After the operators transport the symmetrically fitted semi-circular inner cylinder frame and the outer cylinder frame with attached platform, etc., to the actual mold placement location using the roadway transportation equipment, the symmetrical arc strips and arc grooves are fastened together to form a complete cylindrical inner cylinder and an outer cylinder with attached platform.

[0027] (3) After the column frame is spliced, the pull ring buckles symmetrically distributed at both ends of the semi-circular outer cylinder frame are fastened together and fixed with hexagonal bolts to prevent the left and right symmetrical parts of the outer cylinder and the platform from being misaligned during the filling and support operation, thereby increasing reliability and stability; the protruding groove on the inner side of the upper cover frame is fastened to the first groove at the top of the outer wall of the inner cylinder, so as to add the upper cover frame to the top of the outer wall of the inner cylinder to increase the contact area when actually contacting the top plate, and the actual connection to the top is more compact;

[0028] (4) After the outer cylinder and the lower support platform are assembled, align the bottom bolt holes of the hydraulic cylinder of the hydraulic device with the bolt holes on both sides of the platform and fix them with hexagonal bolts. Align the top bolt holes of the hydraulic rod of the hydraulic device with the bottom bolt holes of the metal buckle and fix them with hexagonal bolts. Align the inner bolt holes of the metal buckles on both sides with the bolt holes of the semi-circular outer cylinder frame and fix them with hexagonal bolts.

[0029] (5) Place the rubber gasket on the top of the outer cylinder. The operator holds the inner cylinder with both hands in the grip groove designed on the side of the upper cover frame. Place the inner cylinder from top to bottom in the center of the outer cylinder so that the inner and outer cylinders fit tightly together until the bottom of the upper cover frame and the top of the outer cylinder clamp the rubber gasket. Adding the rubber gasket can reduce the problem of grout leakage and filling grout flowing into the slot.

[0030] (6) According to the actual engineering requirements for the filling column height, adjust the inner cylinder to the corresponding height by moving it up and down. At this time, start the hydraulic device, and the hydraulic pressure drives the hydraulic rod to rise. The metal buckle gradually rotates to the position corresponding to the arc groove of the inner cylinder and engages under the drive of the hydraulic rod. At this time, stabilize the oil pressure of the hydraulic device to keep the height of the hydraulic rod unchanged. After checking the tightness of the engagement between the metal buckle and the arc groove of the inner cylinder, the stability of the overall device and the sealing, start pouring through the pouring port.

[0031] (7) After the pouring process is completed, the filling column is properly cured (maintaining suitable humidity and temperature) to promote the solidification and strength development of the filling material. After the filling body has completely solidified, and after ensuring the stability and safety of the filling column, the equipment used is dismantled, recycled, cleaned, maintained and reused, which improves the efficiency of resource utilization and is in line with the principle of sustainable development.

[0032] Furthermore, when adjusting the height of the inner cylinder frame, the electro-hydraulic device lowers the hydraulic rod using oil pressure. The metal clips that engage with the arc-shaped grooves of the inner cylinder gradually rotate and open under the drive of the hydraulic rod. After the operator raises the inner cylinder to the required height according to the working conditions, the electro-hydraulic device raises the hydraulic rod again using oil pressure, causing the metal clips to engage with the corresponding arc-shaped grooves of the inner cylinder once more. In other words, the raising and lowering of the entire hydraulic device is achieved by electro-controlling the oil inlet and outlet of the hydraulic cylinder and hydraulic rod. Adjusting the raising and lowering of the entire hydraulic device adjusts the opening and closing of the metal clips with the arc-shaped grooves of the inner cylinder corresponding to different working heights, thus enabling the pouring of filling materials at different heights. After assembly, the entire system is simple, quick to use, and has a large load-bearing capacity.

[0033] The beneficial effects of this invention are:

[0034] (1) The inner and outer cylinders are symmetrically fitted and assembled molds, which can be mass-produced, disassembled, transported and maintained.

[0035] (2) The overall size of the filling support device can be adjusted according to the actual needs of the project to adapt to different mine working conditions and improve production efficiency;

[0036] (3) In this invention, when assembling the various components, devices such as pull ring buckles and arc strips are used to make the assembly of the mold more convenient, faster and more stable;

[0037] (4) The height adjustment of the present invention uses metal buckles, hydraulic devices, etc., which enhances the stability of the filling mold during operation. At the same time, the operator only needs to control the oil inlet and outlet of the hydraulic device through the remote electric control button, saving manpower.

[0038] (5) It is highly adjustable and the height can be adjusted according to the on-site working conditions so that the height of the filling column can better meet the requirements of the project;

[0039] (6) The device can be dismantled, recycled, cleaned, maintained and reused, which improves the utilization rate of resources and is in line with the principle of sustainable development. Attached Figure Description

[0040] Figure 1 A three-dimensional structural diagram of a height-adjustable nested inner and outer cylinder filling and casting device;

[0041] Figure 2 A front view of a height-adjustable nested inner and outer cylinder filling and casting device;

[0042] Figure 3 for Figure 2 The right view;

[0043] Figure 4 for Figure 2 Top view;

[0044] Figure 5 A schematic diagram of a symmetrically fitted semi-circular inner cylindrical frame;

[0045] Figure 6 A schematic diagram of the structure of the upper cover frame that is symmetrically fitted onto the top of the inner cylinder;

[0046] Figure 7 A schematic diagram of the semi-circular outer cylindrical frame connecting to the lower supporting platform;

[0047] Figure 8 A schematic diagram of the combined structure of two semi-circular outer cylindrical frames connecting the lower supporting platform;

[0048] Figure 9 This is a 3D structural diagram of a pull-tab fastener;

[0049] Figure 10 Front view of the loop fastener;

[0050] Figure 11 for Figure 10 A 3D structural diagram of a center loop fastener rotated 45°;

[0051] Figure 12 A 3D structural diagram of the metal buckle;

[0052] Figure 13 This is a schematic diagram of the assembly of the metal buckle and the outer cylinder.

[0053] Figure 14 A schematic diagram of a structure for installing hydraulic devices on the left and right sides of the lower support platform;

[0054] Figure 15 A schematic diagram illustrating the height adjustment process of a height-adjustable nested inner and outer cylinder filling and casting device;

[0055] Figure 16 This is an isometric view of the height-adjustable inner and outer cylinder nested filling and pouring device during the filling operation in the mining area construction process of Example 2;

[0056] Figure 17 This is a top view of the height-adjustable inner and outer cylinder nested filling and pouring device during the filling operation in the mining area construction process of Example 2.

[0057] Figure 18 This is a flowchart illustrating the transfer of filling materials from the ground to the well during the filling operation of the filling and casting device of the present invention;

[0058] Figure 19 The diagram shows the layout of the roadway side support pouring process using the filling and pouring device of the present invention in the roadway plan.

[0059] In the diagram: 1 is the semi-circular inner cylinder frame, 2 is the arc-shaped groove, 3 is the upper cover frame, 4 is the semi-circular outer cylinder frame, 5 is the lower support platform, 6 is the pull ring buckle, 7 is the hook, 8 is the pull ring, 9 is the lock, 10 is the lock curved cover plate, 11 is the spring, 12 is the metal buckle, 13 is the hydraulic cylinder, 14 is the hydraulic rod, 15 is the rubber gasket, 16 is the pouring port, and 17 is the bolt hole. Detailed Implementation

[0060] The present invention will be further illustrated by the following embodiments, but is not limited to the following embodiments. Example 1

[0061] This embodiment provides a height-adjustable nested inner and outer cylinder filling and casting device, such as... Figures 1-15 As shown, it includes two symmetrically fitted semi-circular inner cylinder frames 1 and two symmetrically fitted semi-circular outer cylinder frames 4. A lower support platform 5 is connected to the bottom of the semi-circular outer cylinder frame 4. The two semi-circular inner cylinder frames 1 are combined to form the entire inner cylinder. The two semi-circular outer cylinder frames 4 are fixedly connected by pull ring buckles 6 on the surface to form the outer cylinder. Then, the fitted inner cylinder is embedded into the fixed outer cylinder. That is, the above two sets of filling frames are assembled to form a nested filling and pouring device with inner and outer cylinders.

[0062] The inner and outer cylinders fit tightly together after being fitted together, making it difficult for the filling grout to seep out; the nested inner and outer cylinder filling and casting device can form a cavity-type filling and casting frame. A casting port is provided at the upper end of the inner cylinder, and the filling grout is poured into the cavity through the casting port.

[0063] The top of the inner cylinder is provided with an upper cover frame 3;

[0064] Hydraulic devices are connected to the left and right sides of the lower support platform 5. Each hydraulic device includes a hydraulic cylinder 13 and a hydraulic rod 14. The hydraulic cylinder 13 is fixed to the lower support platform 5 and connected to the hydraulic rod 14. The hydraulic rod 14 is connected to the metal buckle 12, and the opening and closing of the metal buckle 12 is controlled by the hydraulic devices. Specifically, bolt holes 17 are provided on the left and right sides of the lower support platform 5. These holes are aligned with the bottom of the hydraulic cylinder 13 and connected by bolts. Simultaneously, the bolt hole 17 at the top of the hydraulic rod is aligned with the bolt hole at the bottom of the metal buckle 12 and connected by bolts. With this configuration, the metal buckle 12 and the arc-shaped groove 2 of the inner cylinder can open and close during the lifting and lowering process of the hydraulic device.

[0065] Furthermore, the two semi-circular inner cylinder frames 1 are combined to form the entire inner cylinder frame, which is a cylindrical structure composed of two semi-circular cylinder structures. One end of the semi-circular cylinder structure is provided with a raised arc-shaped strip, and the other end is provided with an arc-shaped groove that matches the arc-shaped strip. The arc-shaped strip and arc-shaped groove of the two semi-circular cylinder structures are fitted together to symmetrically fit the two semi-circular cylinders together; the outer wall of the entire inner cylinder frame is uniformly provided with inner cylinder arc-shaped grooves.

[0066] The arc-shaped strips and grooves of the left semi-circular inner cylinder frame can correspond precisely with the arc-shaped grooves and strips of the right semi-circular inner cylinder frame; each semi-circular inner cylinder frame has 10 to 20 inner cylinder arc-shaped grooves 2 evenly spaced on its outer wall, and the specific number of arc-shaped grooves depends on the average height of the roadway; during the design, the spacing between adjacent inner cylinder arc-shaped grooves is the same.

[0067] Furthermore, the upper cover frame 3 is a hollow frustum structure, which is composed of two semi-circular frustum structures. One end of the semi-circular frustum structure is provided with a raised arc-shaped strip, and the other end is provided with an arc-shaped groove that matches the arc-shaped strip. The arc-shaped strip and arc-shaped groove of the two semi-circular frustum structures are fitted together to combine the two semi-circular structures together. A curved groove is provided on the outer side of the upper cover frame 3, and a ring of arc-shaped protruding ridge buckles is provided on the inner side to facilitate its fastening with the first arc-shaped groove at the top of the inner cylinder.

[0068] After the two semi-circular inner cylinder frames 1 are assembled, an upper cover frame 3 is added to the top of the inner cylinder. The upper cover frame 3 is a symmetrically fitted and assembled upper cover frame. For this set of symmetrically fitted and assembled upper cover frames, the arc-shaped strips and arc-shaped grooves of the left half of the upper cover frame can be tightly assembled with the arc-shaped strips and arc-shaped grooves of the right half of the upper cover frame. During assembly, the arc-shaped protrusions on the inner side of this set of upper cover frames are engaged with the first set of grooves at the top of the outer wall of the inner cylinder. The inner side of the upper cover frame has protruding arc-shaped protrusions that are the same size as the arc-shaped grooves of the inner cylinder on the outer wall of the semi-circular inner cylinder frame, which can achieve a tight correspondence. Adding an upper cover frame to the top of the outer wall of the inner cylinder frame can increase the contact area when actually contacting the top plate, making the actual connection to the top more compact.

[0069] Furthermore, the two semi-circular outer cylindrical frames 4 are combined to form the entire outer cylinder, which is a cylindrical structure composed of two semi-circular cylindrical structures. One end of the semi-circular cylindrical structure is provided with a raised arc-shaped strip, and the other end is provided with an arc-shaped groove that matches the arc-shaped strip. The arc-shaped strip and arc-shaped groove of the two semi-circular cylindrical structures are fitted together to symmetrically fit the two semi-circular cylinders together to form the outer cylinder. Two bolt holes are provided on the upper part of the semi-circular outer cylindrical frame 4 for connecting the metal buckle 12.

[0070] The arc-shaped strips and grooves of the left semi-circular outer cylindrical frame and its attached lower support platform can be tightly matched with the arc-shaped strips and grooves of the right semi-circular outer cylindrical frame and its attached lower support platform. After the outer cylindrical frame with attached lower support platform is fitted and assembled, the pull ring buckles symmetrically distributed at both ends of the outer wall of the outer cylindrical frame can be manually fastened.

[0071] Furthermore, the structure of the pull ring type hook 6 is as follows: it includes a pull ring 8, a hook 7, a lock 9, and a lock curved surface cover plate 10, which are fixed by a spring 11 and a bolt locking mechanism. The lock curved surface cover plate 10 can rotate on the lock 9 by means of a pivot. The pull ring 8 can be nested inside the lock curved surface cover plate 10 to achieve rotation. Pull ring type hooks 6 are respectively provided on the upper and lower parts of the semi-circular outer cylindrical frame. The hook 7 is fixed on the upper and lower parts of the left semi-circular outer cylindrical frame. The pull ring 8, lock 9, and lock curved surface cover plate 10 are fixed on the upper and lower parts of the right semi-circular outer cylindrical frame. The components of the pull ring type hook 6 are fixed on the semi-circular outer cylindrical frame by bolts. After the arc strips and arc grooves of the left and right semi-circular outer cylindrical frames are fitted, the lock curved surface cover plate on the right semi-circular outer cylindrical frame is opened, and the pull ring on the cover plate is fastened to the hook of the left semi-circular outer cylindrical frame to complete the hook fixing. The locking curved cover plate has an internal spring that automatically rebounds when the cover plate is opened. To further ensure that the latches remain securely fastened under harsh working conditions or strong vibration environments, and to prevent problems such as the locking curved cover plate coming detach, the latches are secured with 6mm diameter hexagonal bolts. The pull-ring type latches symmetrically distributed at both ends of the semi-circular outer cylindrical frame are fixed by a spring and bolt locking mechanism.

[0072] Furthermore, symmetrically distributed metal clips 12 are installed along the axis of the cylinder on the inner side of the top of the semi-circular outer cylinder frame. These clips are made of carbon steel, possessing good load-bearing strength and durability against corrosion. The metal clips are the same size as the arc-shaped grooves in the inner cylinder, ensuring a tight fit. By adjusting the metal clips' insertion height into the arc-shaped grooves of the inner cylinder at different heights, the height of the filling and pouring device can be adjusted. For ease of assembly, the metal clips 12 are equipped with two sets of bolt holes: the first set of bolt holes is located on the inner side of the metal clip and at the top of the outer cylinder frame, used to connect the outer cylinder frame; the second set of bolt holes is located at the bottom of the metal clip and at the top of the hydraulic rod, used to connect the hydraulic rod; a third set of bolt holes is arranged at the bottom of the hydraulic cylinder and on the surface of the lower support platform, used to connect the hydraulic cylinder to the lower support platform. After aligning all sets of bolt holes, hexagonal bolts are used for fixing.

[0073] Furthermore, hydraulic devices are installed on the left and right sides of the lower support platform. Bolt holes are distributed on the left and right sides of the lower support platform. The hydraulic devices consist of a hydraulic cylinder at the bottom and a hydraulic rod at the top. The lifting and lowering of the hydraulic device is achieved by adjusting the oil inlet and outlet of the hydraulic cylinder and hydraulic rod. The bolt holes at the bottom of the hydraulic cylinder can be aligned with the bolt holes on both sides of the platform and fixed with hexagonal bolts; the bolt holes at the top of the hydraulic rod can be aligned with the bolt holes at the bottom of the metal clip and fixed with hexagonal bolts. That is, the lifting and lowering of the entire hydraulic device is achieved by adjusting the oil inlet and outlet of the hydraulic cylinder and hydraulic rod. The opening and closing of the metal clip is adjusted by adjusting the lifting and lowering of the entire hydraulic device. The opening and closing of the metal clip is adjusted to correspond to the arc-shaped grooves of the inner cylinder at different heights, so as to achieve the effect of adjustable height of the filling and pouring device.

[0074] Furthermore, a rubber gasket 15 is placed on the top of the outer cylinder, with its inner and outer diameters equal to those of the outer cylinder. The resulting ring fits tightly against the outer surface of the inner cylinder. After assembling the upper cover frame and the inner cylinder, the entire assembly is placed into the outer cylinder from top to bottom until the bottom of the upper cover frame and the top of the outer cylinder together clamp the rubber gasket. Adding the rubber gasket reduces grout leakage through gaps and prevents filling grout from seeping into the device's gaps.

[0075] The metal buckle protrusions are threaded, which increases the roughness of the contact surface and increases the tightness of the subsequent engagement with the inner cylinder's arc-shaped groove; the outer side of the upper cover frame is provided with a curved groove, and the surface of the metal buckle is provided with a curved groove, which increases the surface roughness to prevent slipping during installation by the operator.

[0076] Furthermore, the height-adjustable nested inner and outer cylinder filling and casting device is made of three materials: stainless steel 304, carbon steel, and iron. Specifically, the semi-circular inner cylinder frame, lower support platform, semi-circular outer cylinder frame, and upper cover frame are made of iron; the pull-ring buckle and metal clip are made of carbon steel; and the 6mm diameter hexagonal bolts for fixing the pull-ring buckle, the 10mm diameter hexagonal bolts for fixing the bottom of the hydraulic cylinder of the hydraulic device to the platform, the 8mm diameter hexagonal bolts for fixing the top bolt hole of the hydraulic rod of the hydraulic device to the bottom bolt hole of the metal clip, and the 4mm diameter hexagonal bolts for fixing the inner bolt holes of the two side metal clips to the outer wall bolt holes of the outer cylinder are made of stainless steel 304. The structures of the components provided by this invention are relatively complex, and each component needs to be prefabricated according to the above material requirements and then transported downhole for assembly.

[0077] This invention provides a method for using the above-mentioned height-adjustable inner and outer cylinder nested filling and casting device, comprising the following steps:

[0078] (1) Determine design parameters and requirements: First, based on the specific design parameters and requirements of the project (such as mine type, mining method, roadway width, roof and floor height), determine the diameter, height and other parameters of the filling body, as well as the required filling material type and performance indicators.

[0079] (2) Based on the engineering measurement calculations and the actual mold placement location, the mold is transported to the goaf roadway and assembled. After the operators transport the symmetrically fitted semi-circular inner cylinder frame and the outer cylinder frame with attached platform to the actual mold placement location using the roadway transport equipment, the symmetrical arc strips and arc grooves are matched to form a complete cylindrical inner cylinder and an outer cylinder with attached lower support platform.

[0080] (3) After the column frame is spliced, the pull ring buckles symmetrically distributed at both ends of the semi-circular outer cylinder frame are fastened together and fixed with hexagonal bolts to prevent the left and right symmetrical parts of the outer cylinder and the platform from being misaligned during the filling and support operation, thereby increasing reliability and stability; the arc-shaped protruding buckle on the inner side of the upper cover frame is fastened to the first groove at the top of the outer wall of the inner cylinder, so as to add the upper cover frame to the top of the outer wall of the inner cylinder to increase the contact area when actually contacting the top plate, and the actual connection to the top is more compact.

[0081] (4) After the outer cylinder and the lower support platform are assembled, align the bottom bolt holes of the hydraulic cylinder of the hydraulic device with the bolt holes on both sides of the platform and fix them with hexagonal bolts. Align the top bolt holes of the hydraulic rod of the hydraulic device with the bottom bolt holes of the metal buckle and fix them with hexagonal bolts. Align the inner bolt holes of the metal buckles on both sides with the bolt holes of the semi-circular outer cylinder frame and fix them with hexagonal bolts.

[0082] (5) Place the rubber gasket on the top of the outer cylinder. The operator holds the curved groove on the side of the upper cover frame of the inner cylinder and puts the inner cylinder into the center of the outer cylinder from top to bottom, so that the inner and outer cylinders fit tightly together until the bottom of the upper cover frame and the top of the outer cylinder clamp the rubber gasket. Adding a rubber gasket can reduce the problem of grout leakage and filling grout flowing into the slot.

[0083] (6) According to the actual engineering requirements for the filling column height, adjust the inner cylinder to the corresponding height by moving it up and down. At this time, start the hydraulic device, and the hydraulic pressure drives the hydraulic rod to rise. The metal buckle gradually rotates to the position corresponding to the arc groove of the inner cylinder and engages under the drive of the hydraulic rod. At this time, stabilize the oil pressure of the hydraulic device to keep the height of the hydraulic rod unchanged. After checking the tightness of the engagement between the metal buckle and the arc groove of the inner cylinder, the stability of the overall device and the sealing, start pouring through the grouting port.

[0084] (7) After the pouring process is completed, the filling column is properly cured (maintaining suitable humidity and temperature) to promote the solidification and strength development of the filling material. After the filling body has completely solidified, and after ensuring the stability and safety of the filling column, the equipment used is dismantled, recycled, cleaned, maintained and reused, which improves the efficiency of resource utilization and is in line with the principle of sustainable development.

[0085] Furthermore, when adjusting the height of the inner cylinder frame, the electro-hydraulic device is operated. Oil pressure drives the hydraulic rod to lower, disengaging the metal clip from the inner cylinder's arc-shaped groove. The operator then raises the inner cylinder to the required height based on the working conditions. Finally, the electro-hydraulic device raises the hydraulic rod again, re-engaging the metal clip with the corresponding arc-shaped groove. In other words, the raising and lowering of the entire hydraulic device is achieved by electrically controlling the oil inlet and outlet of the hydraulic cylinder and hydraulic rod. Adjusting the raising and lowering of the entire hydraulic device regulates the opening and closing of the metal clip with the corresponding arc-shaped groove of the inner cylinder at different working heights, thus enabling the pouring of filling materials at different heights. After assembly, the entire system is simple, quick to use, and has a large load-bearing capacity. Example 2

[0086] This embodiment uses a height-adjustable nested inner and outer cylinder filling and casting device for filling, as follows:

[0087] 1. Before carrying out backfilling operations, it is first necessary to determine the type of backfilling material. If the cost of the backfilling material is too high or the supply is insufficient, it will not be able to meet the long-term, large-scale backfilling needs of the mine. Secondly, it is necessary to determine the capabilities of the key backfilling equipment. Suitable backfilling equipment requires precise control of the transportation and filling process of the backfill slurry. Therefore, concrete and other backfilling materials are selected and prepared into backfilling slurry using a mixer. The backfilling slurry is then transported underground via a backfilling pump and a long-distance pipeline, and poured through the grouting port arranged at the top of the equipment. There is no need to lower the material into the mine; the backfilling pump station can simply be placed on the surface (e.g., Figure 18 (As shown).

[0088] 2. Transport the mold components to the goaf-retention tunnel and assemble them. Therefore, a cavity filling and casting frame assembled from symmetrically fitted semi-circular filling inner cylinder frames and filling outer cylinder frames with attached platforms is required. The outer cylinder diameter is 2.1m, the inner cylinder diameter is 2.0m, and the height of the filling and casting device can vary with the raising and lowering of the inner cylinder, ranging from 1.3 to 3.0m, with a thickness of 25cm. Operators transport the symmetrically fitted semi-circular inner cylinder frames and outer cylinder frames with attached platforms to the actual mold placement location using tunnel transport equipment. Then, the symmetrical arc-shaped strips and arc-shaped grooves are matched and assembled into a complete cylindrical inner cylinder and an outer cylinder with a lower support platform (e.g., ...). Figure 5 , Figure 8 (As shown).

[0089] After the column frame is assembled, the symmetrically distributed pull-ring buckles at both ends of the outer wall of the outer cylinder are fastened together and fixed with hexagonal bolts to prevent misalignment of the symmetrical left and right parts of the outer cylinder and platform during the filling and support operation, thereby increasing reliability and stability (e.g. Figure 8(As shown); the arc-shaped protruding rib on the inner side of the upper cover frame 3 is fastened to the first groove at the top of the outer wall of the inner cylinder, thereby increasing the contact area when the upper cover frame 3 is installed at the top of the outer wall of the inner cylinder, making the actual contact with the top plate more compact (as shown). Figure 6 (As shown).

[0090] After the outer cylinder and lower support platform are assembled, align the bottom bolt holes of the hydraulic cylinder 13 of the hydraulic device with the bolt holes on both sides of the platform and fix them with hexagonal bolts. Align the top bolt holes of the hydraulic rod 14 of the hydraulic device with the bottom bolt holes of the metal clip 12 and fix them with hexagonal bolts (e.g. Figure 13 As shown), align the inner bolt holes of the metal clips 12 on both sides with the bolt holes on the outer wall of the outer cylinder and fix them with hexagonal bolts (as shown). Figure 14 (As shown).

[0091] Place the rubber gasket 15 on top of the outer cylinder. The operator holds the inner cylinder with both hands in the gripping grooves designed on the side of the upper cover frame 3, and places the inner cylinder from top to bottom into the center of the outer cylinder slot until the bottom of the upper cover frame 3 and the top of the outer cylinder clamp the rubber gasket 15 (e.g., Figure 1 (As shown). Adding a rubber gasket 15 can reduce the problems of grout leakage and filling grout flowing into the slot.

[0092] According to the required height of the filling column in the actual project, the inner cylinder is adjusted to the corresponding height by moving it up and down. At this time, the hydraulic device is activated, and the hydraulic rod 14 is raised by the oil pressure. The metal buckle 12 is driven by the hydraulic rod 14 to gradually rotate to the position corresponding to the arc-shaped groove of the inner cylinder and engage. At this time, the oil pressure of the hydraulic device is stabilized to maintain the height of the hydraulic rod 14 unchanged (e.g., Figure 15 (As shown).

[0093] After checking whether the height and dimensions of the filling support device that has been adjusted meet the dimensional requirements of the specific project, check the tightness of the metal buckle groove and the inner cylinder arc groove, the stability of the overall device and the sealing, and then start pouring through the pouring port 16.

[0094] 3. Goaf retention refers to the practice of preserving the haulage roadway of the upper section of the working face after mining is completed, by strengthening support, to serve as the return airway for the lower section of the working face. Its core principle is to utilize existing roadways, avoiding the need for re-excavation, thereby reducing the amount of roadway excavation work and increasing coal recovery rate. The height-adjustable inner and outer cylinder nested filling and casting device performs the filling operation during the working face advancement of the roadway, during which time the roadway still serves as the haulage roadway of the upper section of the working face.

[0095] When the roadway serves as a transport roadway for the upper section working face, a goaf is formed behind it as the working face advances. During this period, the goaf-side support structure cast by the height-adjustable inner and outer cylinder nested filling and casting device replaces the coal pillar.

[0096] Since the concrete for the side support of the goaf-retaining roadway is usually poured on the side of the roadway closest to the goaf, a set of height-adjustable nested inner and outer cylinder filling and pouring devices is arranged along the side of the roadway closest to the goaf to pour the filling body for the side support of the goaf-retaining roadway. Five to six height-adjustable nested inner and outer cylinder filling and pouring devices are selected as a set, with a spacing of 0.5 to 1 meter between the devices. Near the coal face and the hydraulic support, the roof of the goaf-retaining roadway in this area is first reinforced with anchor bolts and anchor mesh, and a rock retaining device is erected before the filling and pouring begins.

[0097] 4. In a specific project, the original roadway cross-section was 3.0 m × 2.4 m, and the final roadway cross-section was approximately 3.0 m × 2.1 m. The roadway height changed from 2.4 m to about 2.1 m, a variation of approximately 0.3 m. This means that the roadway height within the goaf-side roadway can fluctuate due to various factors such as mining impacts, geological conditions, and support techniques. Therefore, based on the different bearing capacities required for the filling columns in the roadway-side support and filling areas at different roadway heights, the actual height dimensions of the required filling columns are calculated, and filling columns of different height dimensions are selected. In the roadway-side support and filling areas with lower roadway heights, filling columns with a diameter of 2.1 m and a height of 2.1 m are selected (e.g., ...). Figure 17 As shown in the diagram, A represents the already filled portion; in the roadway support and filling area with a high roadway height, operators can increase the height of the filling column, selecting a filling column with a diameter of 2.1m and a height of 2.4m (e.g. Figure 16 As shown, the height adjustment process of the device is illustrated. Therefore, a cavity filling and casting frame is assembled from mold components such as a symmetrically fitted semi-circular filling inner cylinder frame and a filling outer cylinder frame with an attached platform. The outer cylinder diameter is 2.1m, the inner cylinder diameter is 2.0m, and the height of the filling and casting device can vary with the raising and lowering of the inner cylinder, with a height variation range of 1.3~3.0m and a thickness of 25cm (e.g., ...). Figure 15 , 16 (As shown).

[0098] 5. During the pouring process, if Figure 19As shown, after the filling slurry in device ⑤ solidifies, the mold components that fit together on the left and right sides of device ⑤ can be removed, cleaned, and reused. While the filling slurry in devices ①, ②, ③, and ④ is being poured and solidifying, the coal face advances a certain distance. The recently removed and cleaned device ⑤ is placed at a suitable position near the goaf, behind the advancing distance of the working face. The height is adjusted, and pouring is performed, filling the selected filling material into the filling cavity frame. It is crucial to ensure even distribution of the filling material and avoid voids and deformation. After completing the pouring process, the filling column is properly cured (maintaining suitable humidity and temperature) to promote the solidification and strength development of the filling material. Wait for the filling body to completely solidify, ensuring the stability and safety of the filling column. Then, repeat this process.

[0099] The goaf-side filling columns formed by this process are a support structure with a certain thickness and strength. The goaf-side support filling columns can support the roof load at the edge of the collapse zone, share and reduce the load on the supports in the goaf, prevent serious deformation of the original supports in the goaf, fill the missing coal sidewalls in the goaf area, and together with the reinforced support formed by the roof anchor bolts and anchor mesh of the goaf-side filling, they can jointly bear the roadway pressure caused by mining, which helps to stabilize and control the surrounding rock of the roadway. When serving the return airway of the next working face, it reduces the roadway excavation and achieves the purpose of goaf-side filling.

Claims

1. A height-adjustable nested inner and outer cylinder filling and casting device, characterized in that: The application relates to a height-adjustable inner-outer cylinder nested filling pouring device. The inner-outer cylinder is tightly combined after being assembled, so that filling slurry is not easy to seep out; the inner-outer cylinder nested filling body pouring device forms a cavity type filling pouring frame; a pouring opening is arranged at the upper end of the inner cylinder, and filling slurry is poured into the cavity through the pouring opening; An upper cover platform is arranged at the top of the inner cylinder. Hydraulic devices are arranged on the left and right sides of the lower support platform, the hydraulic devices comprise hydraulic cylinders and hydraulic rods, the hydraulic cylinders are fixed on the lower support platform, the hydraulic cylinders are connected with the hydraulic rods, the hydraulic rods are connected with metal buckles at the upper part, the opening and closing of the metal buckles are controlled through the lifting of the hydraulic devices, and the metal buckles are used for fixing the inner cylinder.

2. The height-adjustable inner-outer cylinder nested filling pouring device according to claim 1 is characterized in that: The inner cylinder is in a cylindrical structure, one end of the semicircular inner cylinder frame is provided with a protruding arc-shaped strip, the other end is provided with an arc-shaped groove matched with the arc-shaped strip, the arc-shaped strips and the arc-shaped grooves of the two semicircular inner cylinder frames are embedded and assembled, and one group of semicircular inner cylinder frames are symmetrically embedded together; the outer wall of the whole inner cylinder is uniformly provided with inner cylinder arc-shaped grooves; The left and right semicircular inner cylinder frames are tightly fixed through the corresponding embedding of the arc-shaped strips and the arc-shaped grooves; the outer wall of each semicircular inner cylinder frame is equidistantly provided with a plurality of inner cylinder arc-shaped grooves; the spacing of adjacent inner cylinder arc-shaped grooves is the same.

3. The height-adjustable inner-outer tube nested type filling and casting device according to claim 1, characterized in that: The outer cylinder is in a cylindrical structure and is composed of two semicircular outer cylinder frames, one end of the semicircular outer cylinder frame is provided with a protruding arc-shaped strip, the other end is provided with an arc-shaped groove matched with the arc-shaped strip, the arc-shaped strips and the arc-shaped grooves of the two semicircular outer cylinder frames are embedded and assembled, and the two semicircular outer cylinder frames are symmetrically embedded together to form the outer cylinder; two bolt holes are arranged on the upper part of the semicircular outer cylinder frame respectively for connecting the metal buckle; the pull ring type buckle comprises a pull ring, a pull hook, a lock and a lock curved cover plate and is fixed through a spring and a bolt locking mechanism; The left and right semicircular outer cylinder frames and the lower support platforms attached thereto are tightly fixed through the corresponding embedding of the arc-shaped strips and the arc-shaped grooves; after the outer cylinder frame with the lower support platform is embedded and assembled, the pull ring type buckles symmetrically distributed at the two ends of the outer wall of the outer cylinder are manually buckled.

4. The height-adjustable inner-outer tube nested type filling and pouring device according to claim 3, characterized in that: The upper and lower parts of the semicircular outer cylinder frame are respectively provided with pull ring type buckles, the upper and lower parts of the left semicircular outer cylinder frame are fixed with pull hooks, and the upper and lower parts of the right semicircular outer cylinder frame are respectively fixed with pull rings, buckles and buckle curved cover plates, and the components of the pull ring type buckle are fixed on the semicircular outer cylinder frame by bolts; the buckle curved cover plate rotates on the buckle by means of a rotating shaft, the pull ring is nested in the inside of the buckle curved cover plate to realize rotation, after the arc-shaped strips and arc-shaped grooves of the left and right semicircular outer cylinder frames are embedded, the buckle curved cover plate on the right semicircular outer cylinder frame is opened, the pull ring on the cover plate is buckled to the pull hook of the left semicircular outer cylinder frame, and the buckle fixing is completed; the inside of the buckle curved cover plate is provided with a spring, and the spring plays an automatic rebounding role when the buckle curved cover plate is opened.

5. The height-adjustable inner-outer tube nested type filling and placing device according to claim 3, characterized in that: The left and right sides of the lower supporting platform are provided with bolt holes, which are aligned with the bottom of the hydraulic cylinder and connected by bolts; the top bolt hole of the hydraulic rod is connected with the bottom of the metal buckle by bolts; during the height adjustment of the inner cylinder, the embedding or separation of the metal buckle and the arc-shaped groove of the inner cylinder is controlled by the lifting of the hydraulic device to fix the position of the inner cylinder; The upper cover frame is a hollow circular platform structure, which is composed of two symmetrical semicircular circular platform structures, one end of each semicircular circular platform structure is provided with a protruding arc-shaped strip, and the other end is provided with an arc-shaped groove matched with the arc-shaped strip, the arc-shaped strips and arc-shaped grooves of the two semicircular circular platform structures are embedded and assembled, and the two semicircular structures are combined together to form a complete upper cover frame; a curved groove is arranged on the outside of the upper cover frame, and an arc-shaped rib buckle is arranged on the inside, which facilitates the buckling of the first arc-shaped groove at the top end of the inner cylinder.

6. The height-adjustable inner-outer tube nested type filling and placing device according to claim 1, characterized in that: Symmetrically distributed metal buckles are installed on the inside of the top end of the semicircular outer cylinder frame along the cylinder axis direction; the metal buckles are made of carbon steel and have good load bearing strength and corrosion resistance; the structure of the metal buckle is an arc-shaped block, the outside is an arc-shaped plate, two parallel ribs are vertically connected to the upper part of the arc-shaped plate, and a bottom plate is vertically connected to the lower part of the arc-shaped plate; the two parallel ribs are matched with the inner cylinder arc-shaped groove on the inner cylinder in size, and the two can be horizontally embedded; when adjusting the metal buckle, embed it in the inner cylinder arc-shaped groove of different heights, that is, fix the inner cylinder at the required height, so as to realize the height-adjustable effect of the filling and pouring device; The bottom plate end of the metal buckle is provided with a connecting block, and a bolt hole is opened in the center of the connecting block for connecting and fixing with the outer cylinder frame; a bolt hole is arranged below the bottom plate of the metal buckle for connecting the hydraulic rod; the rib of the metal buckle is provided with threads to increase the tightness of the buckling of the metal buckle and the inner cylinder arc-shaped groove.

7. The height-adjustable inner-outer tube nested type filling and placing device according to claim 1, characterized in that: A rubber gasket is placed on the top of the outer cylinder, the inner and outer diameters of the rubber gasket are the same as the inner and outer diameters of the outer cylinder, and the rubber gasket is placed on the top of the outer cylinder; after the upper cover frame and the inner cylinder are assembled, the two are placed into the outer cylinder from top to bottom as a whole until the bottom of the upper cover frame and the top of the outer cylinder clamp the rubber gasket together.

8. The height-adjustable inner-outer tube nested type filling and placing device according to claim 1, characterized in that: The outer side of the upper cover frame and the surface of the metal buckle are both provided with curved grooves; the semicircular inner cylinder frame, the lower supporting platform, the semicircular outer cylinder frame and the upper cover frame are made of iron material; the pull ring buckle and the metal buckle are made of carbon steel material; the bolts used for connecting the components are made of stainless steel 304 material.

9. A method of using the highly adjustable inner-outer tube nested formwork filling and casting device according to any one of claims 1 to 8, characterized in that The method comprises the following steps: The method comprises the following steps: (1) Determine the design parameters and requirements: first, according to the specific design parameters and requirements of the project, determine the diameter, height parameters of the filling body, and the type and performance index of the filling material required; (2) According to the engineering survey calculation and the actual mold placement position, the mold is transported to the roadway along the empty roadway and assembled; the operator transports the symmetrical embedded half-cylinder frame and the outer cylinder frame mold parts with the attached platform to the actual placement position of the mold through the roadway transportation equipment, and then the symmetrical arc strips and arc grooves are buckled to form a complete cylindrical inner cylinder and an outer cylinder with a lower supporting platform, respectively; (3) After the column frame is spliced, the half-cylinder outer cylinder frame is buckled on both ends of the symmetrical distribution of the pull ring type buckle, and is fixed with hexagonal bolts to prevent the left and right symmetrical parts of the outer cylinder and the platform from separating during the filling and supporting operation, thereby increasing the reliability and stability; the arc rib buckle on the inner side of the overlying platform frame is buckled with the first inner cylinder arc groove at the top of the inner cylinder, and the overlying platform frame is installed on the top of the outer wall of the inner cylinder, which can increase the contact area when actually contacting the roof, so that the roof is more dense; (4) After the outer cylinder and the lower supporting platform are assembled, the hydraulic cylinder bottom bolt hole is aligned with the bolt hole on both sides of the lower supporting platform, and is fixed with hexagonal bolts, the hydraulic rod top bolt hole is aligned with the metal buckle bottom bolt hole, and is fixed with hexagonal bolts, and the metal buckle inside bolt hole is aligned with the outer cylinder frame bolt hole, and is fixed with hexagonal bolts; (5) Place the rubber gasket on the top of the outer cylinder, and the operator holds the curved groove on the side of the inner cylinder overlying platform frame with both hands, places the inner cylinder on the outer cylinder from top to bottom, and makes the inner and outer cylinders tightly fit until the rubber gasket is clamped between the bottom of the overlying platform frame and the top of the outer cylinder; the rubber gasket can reduce slurry leakage and prevent filling slurry from seeping into the gap; (6) According to the filling column height required by the actual project, the inner cylinder is adjusted to the corresponding height by moving up and down, at this time the hydraulic device is started, the oil pressure drives the hydraulic rod to rise, the metal buckle gradually reaches the corresponding position of the inner cylinder arc groove under the drive of the hydraulic rod and is buckled, at this time the oil pressure of the hydraulic device is stable to maintain the height of the hydraulic rod unchanged; after checking the buckling tightness of the metal buckle and the inner cylinder arc groove, the stability and sealing of the whole device, pouring is started through the pouring port; (7) After completing the pouring process, the filling column is maintained to promote the solidification of the filling material; Wait for the filling body to completely solidify, and after ensuring the stability and safety of the filling column, the used device is removed, recycled, cleaned, maintained and reused.

10. The method of using a height adjustable inner and outer telescoping form filling and placing apparatus according to claim 9, wherein: When adjusting the height of the inner cylinder, operate the electric control hydraulic device, the oil pressure drives the hydraulic rod to lower, the metal buckle buckled with the inner cylinder arc groove gradually separates from the inner cylinder arc groove under the drive of the hydraulic rod, the operator lifts the inner cylinder to the corresponding height according to the height required by the working condition, and then the oil pressure drives the hydraulic rod to rise through the electric control hydraulic device, so that the metal buckle is buckled with the corresponding inner cylinder arc groove again.

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