Coal-rock mass pre-stressed bolt injection and filling supporting structure

Abstract

The utility model relates to the technical field of coal mine construction, in particular to a coal rock mass pre-stressed bolt filling supporting structure which comprises a filling layer, a metal net is arranged on the outer side of the filling layer, a plurality of rows of grouting anchor rods penetrate through the metal net, and grouting anchor cables are installed on the portion, between every two adjacent rows of grouting anchor rods, of the metal net. According to the grouting anchor cable and grouting anchor rod locking device, the quick-mounting assembly composed of the base plate, the nut, the hand wheel, the gear ring, the gear and the rotating shaft is installed at the exposed end of the grouting anchor cable and the exposed end of the grouting anchor rod, unified arrangement of the base plate and the nut is achieved, the defect that the nut and the base plate are prone to being lost is overcome, and the locking efficiency of the exposed end of the grouting anchor cable and the exposed end of the grouting anchor rod is higher; and the gear is rotated through the hand wheel and the rotating shaft, so that the nut is rotated by means of the gear ring after the gear rotates, the nut can be rotated for multiple circles by utilizing the gear ratio of the gear to the gear ring when the hand wheel rotates for one circle, and the labor intensity of workers is reduced while quick installation of the nut is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine construction, in particular to a coal rock mass prestressed anchor grouting support structure. BACKGROUND

[0002] With the continuous increase of coal mining depth and intensity, the mine pressure appears continuously intensified, the deep soft rock, strong dynamic pressure, super kilometer deep well and other complex conditions of roadway deformation are severe, which is manifested as the overall deformation of the mine roadway side wall pressure, which seriously restricts the normal advance of the working face. At present, in order to ensure that the coal mine roadway has sufficient support strength to avoid collapse accidents, a coal rock mass prestressed anchor grouting support structure is used to support the coal mine roadway during construction.

[0003] The existing coal rock mass prestressed anchor grouting support structure mainly comprises a metal net attached to the side wall of the coal mine roadway, a filling layer filled between the metal net and the side wall of the coal mine roadway, a grouting anchor cable installed inside the coal mine roadway, and a grouting anchor rod installed inside the coal mine roadway. When supporting the coal mine roadway, the filling layer and the metal net are first laid on the side wall of the coal mine roadway, and then the grouting anchor rod and the grouting anchor cable are respectively penetrated through the filling layer and the metal net and installed in the coal rock mass. Then, only the exposed ends of the grouting anchor rod and the grouting anchor cable need to be plugged, and the pad and the locking nut are pressed and fixed, so that after grouting through the grouting anchor rod and the grouting anchor cable, the grouting support of the coal mine roadway can be realized.

[0004] Although the existing coal rock mass prestressed anchor grouting support structure can support the side wall of the coal mine roadway, during the grouting support process, the pad and the locking nut at the end of the grouting anchor rod and the grouting anchor cable are separately laid, which not only easily leads to the loss of the pad and the nut during the locking process of the exposed end of the grouting anchor cable and the grouting anchor rod, resulting in low locking efficiency of the grouting anchor rod and the grouting anchor cable, but also easily increases the labor intensity of workers due to repeated screwing operations. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a coal rock mass prestressed anchor grouting support structure which can realize rapid locking of the grouting anchor rod and the grouting anchor cable and effectively reduce the labor intensity.

[0006] The above application purpose of the present application is realized by the following technical scheme:

[0007] The utility model provides a kind of coal rock mass prestressed anchor injection fills support structure, including filling layer, metal net is provided outside the filling layer, multiple rows of grouting anchor rods are penetrated on the metal net, grouting anchor cable is installed between two adjacent rows of grouting anchor rods on the metal net, exposed end of grouting anchor cable and grouting anchor rod is all installed with a quick-mounting assembly, the quick-mounting assembly includes backing plate, nut, hand wheel, gear ring, gear and pivot, wherein the backing plate is hollow structure, the nut is installed in one side of the backing plate, the gear ring is installed in the middle of the nut outer, the gear is installed in the gear ring side of the backing plate, the pivot is installed in the middle of the gear, the hand wheel is connected to one end of the pivot, grouting plug is installed at the grouting anchor rod and the grouting anchor cable close to the filling layer.

[0008] Optionally, the grouting anchor rod is provided with an anchor head I at one end away from the grouting plug, and the grouting anchor cable is provided with an anchor head II at one end away from the grouting plug.

[0009] Optionally, the anchor head I is threadedly connected with the grouting anchor rod, and the anchor head II is threadedly connected with the grouting anchor cable.

[0010] Optionally, the length of the grouting anchor cable is greater than the length of the grouting anchor rod, and the grouting anchor rod and the grouting anchor cable are threadedly connected with the grouting plug.

[0011] Optionally, the hand wheel is located in the hollow structure on the side wall of the backing plate, and a gap is reserved between the hand wheel and the hollow structure on the side wall of the backing plate.

[0012] Optionally, one end of the pivot is rotationally connected with the backing plate, the other end of the pivot is welded with the hand wheel, and the pivot penetrates through the gear and is welded with the gear.

[0013] Optionally, the gear is engaged with the gear ring, and the number of teeth of the gear is greater than the number of teeth of the gear ring.

[0014] Optionally, the two ends of the nut are rotationally connected with the backing plate respectively, the gear ring is welded with the outer wall of the nut, and the size of the middle part of the nut matches the size of the grouting anchor rod and the grouting anchor cable.

[0015] In summary, the present application has at least one of the following beneficial technical effects:

[0016] The utility model discloses a quick -mounting assembly that is installed on the exposed end of the grouting anchor cable and the grouting anchor rod and is composed of a backing plate, a nut, a hand wheel, a gear ring, a gear and a rotating shaft, which not only realizes the unified layout of the backing plate and the nut, avoids the drawbacks that the nut and the backing plate are easy to lose, makes the locking efficiency of the exposed end of the grouting anchor rod and the grouting anchor cable higher, and through the hand wheel and the rotating shaft to make the gear rotate, so as to make the nut rotate by the gear ring after the gear rotates, the number of turns of the nut can be increased by the gear ratio of the gear and the gear ring when the hand wheel rotates one turn, which ensures the quick installation of the nut and reduces the labor intensity of workers. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structural schematic diagram provided by the embodiment of the application;

[0018] Figure 2 is the front view provided by the embodiment of the application;

[0019] Figure 3 is the provided by the embodiment of the application Figure 1 the enlarged view of A in the middle;

[0020] Figure 4 is the down sectional view of the quick -mounting assembly provided by the embodiment of the application;

[0021] Figure 5 is the main sectional view of the quick -mounting assembly provided by the embodiment of the application.

[0022] Mark explanation: 1, anchor head two;2, grouting anchor cable;3, anchor head one;4, grouting anchor rod;5, filling layer;6, metal net;7, quick -mounting assembly;71, backing plate;72, nut;73, hand wheel;74, gear ring;75, gear;76, rotating shaft;8, grouting plug. DETAILED DESCRIPTION

[0023] The application will be further described in detail below with reference to the drawings.

[0024] In order to more clearly understand the technical scheme shown in the embodiment of the application, first, the composition and working principle of the existing coal rock mass prestressed anchor injection supporting structure are introduced.

[0025] The existing coal rock mass pre-stressed anchor injection filling support structure mainly comprises a metal net attached to the side wall of a coal mine tunnel, a filling layer filled between the metal net and the side wall of the coal mine tunnel, a grouting anchor cable installed inside the coal mine tunnel, and a grouting anchor rod installed inside the coal mine tunnel. When supporting the coal mine tunnel, the filling layer and the metal net are first laid on the side wall of the coal mine tunnel, and then the grouting anchor rod and the grouting anchor cable are respectively penetrated through the filling layer and the metal net and installed in the coal rock mass. Then, only the exposed ends of the grouting anchor rod and the grouting anchor cable need to be plugged and fixed by a gasket and a lock nut. After grouting through the grouting anchor rod and the grouting anchor cable, the grouting support of the coal mine tunnel can be realized.

[0026] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 , a coal rock mass pre-stressed anchor injection filling support structure disclosed in the embodiments of the present application comprises a filling layer 5, the outer side of the filling layer 5 is provided with a metal net 6, a plurality of rows of grouting anchor rods 4 are penetrated through the metal net 6, a grouting anchor cable 2 is installed between adjacent two rows of grouting anchor rods 4 on the metal net 6, a quick-mounting assembly 7 is installed at the exposed end of the grouting anchor cable 2 and the grouting anchor rod 4, the quick-mounting assembly 7 comprises a gasket 71, a nut 72, a hand wheel 73, a gear ring 74, a gear wheel 75 and a rotating shaft 76, wherein the gasket 71 is a hollow structure, the nut 72 is installed on one side in the gasket 71, the gear ring 74 is installed on the outer middle part of the nut 72, the gear wheel 75 is installed on the side of the gasket 71 opposite to the gear ring 74, the rotating shaft 76 is installed in the middle of the gear wheel 75, the hand wheel 73 is connected to one end of the rotating shaft 76, and a grouting plug 8 is installed at the position close to the filling layer 5 of the grouting anchor rod 4 and the grouting anchor cable 2. The grouting plug 8 can plug the installation hole port of the grouting anchor rod 4 and the grouting anchor cable 2 to avoid the overflow of grout during grouting.

[0027] Specifically, when locking the exposed end of the grouting anchor cable 2 and the grouting anchor rod 4, the grouting anchor cable 2 and the grouting anchor rod 4 are first installed in the coal rock mass in the coal mine, then the nut 72 on the gasket 71 is aligned with the grouting anchor cable 2 and the grouting anchor rod 4, and the gasket 71 is pressed at the same time. At the same time, the hand wheel 73 on each gasket 71 is rotated, which will make the rotating shaft 76 rotate, the rotating shaft 76 will make the gear wheel 75 rotate after rotating, the gear wheel 75 will make the gear ring 74 rotate after rotating, the gear ring 74 will make the nut 72 rotate after rotating, and the nut 72 will be tightened along the grouting anchor rod 4 and the grouting anchor cable 2 at the same time. In order to reliably lock the exposed end of the grouting anchor cable 2 and the grouting anchor rod 4 after the gasket 71 reliably abuts against the metal net 6.

[0028] Please refer to Figures 1-2 , the end of the grouting anchor rod 4 opposite to the grouting plug 8 is provided with an anchor head one 3, and the end of the grouting anchor cable 2 opposite to the grouting plug 8 is provided with an anchor head two 1.

[0029] As an implementation form, the anchor head one 3 can ensure the reliable fixation of the grouting anchor rod 4 in the coal rock mass, and the anchor head two 1 can ensure the reliable fixation of the grouting anchor cable 2 in the coal rock mass.

[0030] Please refer to Figures 1-2 , the anchor head one 3 is threadedly connected with the grouting anchor rod 4, and the anchor head two 1 is threadedly connected with the grouting anchor cable 2.

[0031] As an implementation form, the threaded connection installation mode can realize the reliable fixation of the anchor head one 3 on the grouting anchor rod 4, and also can ensure the reliable fixation of the anchor head two 1 on the grouting anchor cable 2.

[0032] Please refer to Figures 1-2 , the length of the grouting anchor cable 2 is greater than the length of the grouting anchor rod 4, and the grouting anchor rod 4 and the grouting anchor cable 2 are both threadedly connected with the grouting plug 8.

[0033] As an implementation form, the length of the grouting anchor cable 2 is greater than the length of the grouting anchor rod 4, which can connect and support the deep layer of the coal rock mass under the action of the grouting anchor cable 2, and the grouting anchor rod 4 mainly connects and supports the shallow layer of the coal rock mass.

[0034] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 , the hand wheel 73 is located at the hollow structure on the side wall of the pad 71, and the hand wheel 73 and the hollow structure on the side wall of the pad 71 are reserved with a gap.

[0035] As an implementation form, the existence of the hollow structure on the pad 71 provides sufficient installation space for the hand wheel 73, and the hand wheel 73 and the hollow structure on the side wall of the pad 71 are reserved with a gap, which can ensure the convenient rotation adjustment of the hand wheel 73 relative to the pad 71.

[0036] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 , one end of the shaft 76 is rotationally matched with the pad 71, the other end of the shaft 76 is welded with the hand wheel 73, and the shaft 76 penetrates through the gear 75 and is welded with the gear 75.

[0037] As an implementation form, the rotationally matched installation mode makes the rotation adjustment of the shaft 76 relative to the pad 71 more convenient, and the shaft 76 is welded with the hand wheel 73 and the gear 75, which can realize the synchronous rotation of the shaft 76 and the gear 75 after the rotation of the hand wheel 73.

[0038] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5The gear 75 is engaged with the gear ring 74, and the gear 75 has more teeth than the gear ring 74.

[0039] As an implementation, the gear 75 has more teeth than the gear ring 74, so that the gear ring 74 can rotate more rounds after the gear 75 rotates one round, thereby realizing the rapid synchronous tightening of the nut 72 with the gear ring 74.

[0040] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 Figure 1 Figure 3 Figure 4 Figure 5 , the nut 72 is rotationally matched with the backing plate 71 at both ends, the gear ring 74 is welded with the outer wall of the nut 72, and the middle part of the nut 72 is matched with the size of the grouting anchor rod 4 and the grouting anchor cable 2.

[0041] As an implementation, the rotational matching installation mode makes the rotation adjustment of the nut 72 relative to the backing plate 71 more convenient, and at the same time, can ensure the synchronous movement of the backing plate 71 with the nut 72, realizing the rapid locking of the grouting anchor rod 4 and the grouting anchor cable 2.

[0042] The specific working principle is that when supporting the sidewall of the coal mine tunnel, the filling layer 5 and the metal net 6 are first laid on the sidewall of the coal mine tunnel, then the grouting anchor cable 2 is fixed in the deep part of the coal mine rock mass by means of the anchor head two 1, the grouting anchor rod 4 is fixed in the shallow part of the coal mine rock mass by means of the anchor head one 3, then the nut 72 on the backing plate 71 is opposite to the grouting anchor cable 2 and the grouting anchor rod 4, and the backing plate 71 is pressed, at the same time, the handle 73 on each backing plate 71 is rotated, the rotation of the handle 73 will make the rotating shaft 76 rotate, the rotation of the rotating shaft 76 will make the gear 75 rotate, the rotation of the gear 75 will make the gear ring 74 rotate, the rotation of the gear ring 74 will make the nut 72 rotate, and the nut 72 will be tightened along the grouting anchor rod 4 and the grouting anchor cable 2 while rotating, so as to realize the reliable locking of the exposed ends of the grouting anchor cable 2 and the grouting anchor rod 4 after the backing plate 71 reliably abuts against the metal net 6, and after the grouting anchor cable 2 and the grouting anchor rod 4 are fixed, only the concrete mortar needs to be injected into the coal mine rock mass through the grouting anchor cable 2 and the grouting anchor rod 4, so as to realize the support of the sidewall of the coal mine tunnel. Since in this support structure, not only the unified laying of the backing plate 71 and the nut 72 is realized, avoiding the drawbacks that the nut 72 and the backing plate 71 are easy to be lost, but also the locking efficiency of the exposed ends of the grouting anchor rod 4 and the grouting anchor cable 2 is higher, and the gear 75 is rotated through the handle 73 and the rotating shaft 76, so as to rotate the nut 72 through the gear ring 74 after the gear 75 rotates, the nut 72 can be rotated more rounds through the tooth ratio of the gear 75 and the gear ring 74 after the handle 73 rotates one round, thereby ensuring the rapid installation of the nut 72 while reducing the labor intensity of workers.

[0043] The embodiments of the present application are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, and thus: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A prestressed anchored grouting support structure for coal and rock mass, characterized in that: The system includes a filling layer (5), on the outside of which a metal mesh (6) is provided. Multiple rows of grouting anchor rods (4) are threaded through the metal mesh (6). Grouting anchor cables (2) are installed between adjacent rows of grouting anchor rods (4) on the metal mesh (6). A quick-installation assembly (7) is installed at the exposed ends of the grouting anchor cables (2) and the grouting anchor rods (4). The quick-installation assembly (7) includes a pad (71), a nut (72), a handwheel (73), a gear ring (74), a gear (75), and a rotating shaft (76). The pad (71) has a hollow structure. The nut (72) is installed on one side of the pad (71). The gear ring (74) is installed in the middle of the nut (72). The gear (75) is installed on the side of the gear ring (74) of the pad (71). The rotating shaft (76) is installed in the middle of the gear (75). The handwheel (73) is connected to one end of the rotating shaft (76). The grouting anchor (4) and the grouting anchor cable (2) are both equipped with grouting plugs (8) near the filling layer (5).

2. The prestressed anchored grouting support structure for coal and rock mass according to claim 1, characterized in that: The grouting anchor rod (4) has an anchor head 1 (3) installed at one end opposite to the grouting plug (8), and the grouting anchor cable (2) has an anchor head 2 (1) installed at one end opposite to the grouting plug (8).

3. The prestressed anchored grouting support structure for coal and rock mass according to claim 2, characterized in that: The first anchor head (3) is threadedly connected to the grouting anchor rod (4), and the second anchor head (1) is threadedly connected to the grouting anchor cable (2).

4. The prestressed anchored grouting support structure for coal and rock mass according to claim 1, characterized in that: The length of the grouting anchor cable (2) is greater than the length of the grouting anchor rod (4), and both the grouting anchor rod (4) and the grouting anchor cable (2) are threadedly connected to the sealing plug (8).

5. A prestressed anchored grouting support structure for coal and rock mass according to claim 1, characterized in that: The handwheel (73) is located in the hollow structure on the side wall of the pad (71), and a gap is reserved between the handwheel (73) and the hollow structure on the side wall of the pad (71).

6. A prestressed anchored grouting support structure for coal and rock mass according to claim 5, characterized in that: One end of the rotating shaft (76) is rotatably engaged with the pad (71), and the other end of the rotating shaft (76) is welded to the handwheel (73). The rotating shaft (76) passes through the gear (75) and is welded to the gear (75).

7. A prestressed anchored grouting support structure for coal and rock mass according to claim 6, characterized in that: The gear (75) meshes with the gear ring (74), and the number of teeth of the gear (75) is greater than the number of teeth of the gear ring (74).

8. A prestressed anchored grouting support structure for coal and rock mass according to claim 7, characterized in that: The two ends of the nut (72) are respectively rotated and engaged with the pad (71), the toothed ring (74) is welded to the outer wall of the nut (72), and the size of the middle part of the nut (72) matches the size of the grouting anchor rod (4) and the grouting anchor cable (2).

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