Covered protection structure for high and steep slope blasting excavation

Abstract

The present application relates to the technical field of slope excavation protection, and particularly relates to a covering type protection structure for high and steep slope blasting excavation, which comprises a covering part, a weight bar at both ends of a protection net, and a tensile-resistant connecting assembly between the protection net and the weight bar; a weight dust-settling part, a water tank above the protection net, and a connecting seat fixed on the base surface of each weight bar, equidistant holes in the bottom of the water tank, water outlets equidistantly arranged on the periphery of the bottom of the water tank, and an ejection mechanism in the holes; the water tank is arranged above the protection net, water is added during protection, the weight of the water is used to replace traditional sandbags, the impact force generated during blasting opens the water outlets through the ejection mechanism, thereby effectively inhibiting the dust generated after blasting; the detachable connection between the protection net and the weight bar reduces the difficulty of on-site placement and facilitates subsequent recycling.

Description

Technical Field

[0001] This invention relates to the field of slope excavation and protection technology, and in particular to a covered protection structure for blasting excavation of steep slopes. Background Technology

[0002] The surrounding environment of the steep slope is complex, with major roads and rivers below, and villages and hydroelectric power stations nearby. Rockfalls and mudslides can damage the roads or buildings below, so it is necessary to excavate and reduce the slope for protection.

[0003] Slope excavation employs both mechanical excavation and blasting excavation. Blasting excavation typically involves using detonators distributed in the blasting area according to a planned layout. The blasting then breaks the rock or soil layers in the blasting area, loosening the soil or treating the rock to facilitate subsequent rapid mechanical excavation.

[0004] Blasting produces flying rocks and a lot of dust. Flying rocks can pose a safety hazard to buildings below the slope or construction workers on site. Therefore, traditional blasting involves covering the blasting area with protective netting and placing several sandbags on the netting to resist the impact generated during the blast.

[0005] However, this method is difficult to implement in terms of both initial placement and subsequent recycling, requires a lot of manpower, and cannot effectively reduce dust. Summary of the Invention

[0006] In view of the problems existing in the current covered protection structure for blasting excavation of steep slopes, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a covered protective structure for blasting excavation of steep slopes.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a covering protection structure for blasting excavation of steep slopes, comprising:

[0009] The covering part includes a protective net and counterweights at both ends of the protective net, wherein the two ends of the protective net and the counterweights are connected by tensile-resistant connecting components.

[0010] The counterweight dust suppression part includes a water tank set above the protective net and connecting seats fixed on the base surfaces of the two counterweight bars respectively. The bottom of the water tank has holes at equal intervals, and the bottom of the water tank has water outlet holes at equal intervals around the holes. A push-out mechanism is installed in the holes.

[0011] As a preferred embodiment of the covered protection structure for blasting excavation of steep slopes described in this invention, the jacking mechanism includes an outer component and an inner component movably disposed inside the outer component.

[0012] As a preferred embodiment of the covering protection structure for blasting excavation of steep slopes described in this invention, the outer component includes a ring seat fixed to the bottom of the water tank and communicating with the hole, and a movable column movably disposed inside the hole and the ring seat. A sealing plate is fixed above the outer component, and the sealing plate is located inside the water tank and covers the hole.

[0013] As a preferred embodiment of the covering protection structure for blasting excavation of steep slopes described in this invention, the inner component includes a rotating guide groove opened on the outside of the ring seat and a guide column fixed to the outer periphery of the movable column, with the other end of the guide column inserted into the rotating guide groove.

[0014] As a preferred embodiment of the covering protection structure for blasting excavation of steep slopes described in this invention, a top column is provided at the bottom of the movable column in the rotating guide groove, the upper end of the top column moves within the ring seat through a movable disc, and an ejection spring is connected between the movable disc and the guide column.

[0015] As a preferred embodiment of the covering protection structure for blasting excavation of steep slopes described in this invention, the tensile connection component includes a tensile member, one side of which is connected to the protective netting via a connector, and the other side of which is connected to the counterweight bar via a locking member.

[0016] As a preferred embodiment of the covering protection structure for blasting excavation of steep slopes described in this invention, the tensile member includes a fixing plate and a tension plate located on one side of the fixing plate. Three sets of connecting grooves are equidistantly provided on one side of the fixing plate, with two grooves in each set. Guide posts are fixed equidistantly on one side of the fixing plate. The other end of each guide post penetrates the tension plate, and a tension spring is sleeved on the outside of the guide post extending out of the tension plate.

[0017] As a preferred embodiment of the covered protection structure for blasting excavation of high and steep slopes described in this invention, the connecting parts include connecting sleeve one and connecting sleeve two. Movable arms are fixed to one side of both the fixed plate and the tension plate. Pins are rotatably connected to the ends of the two movable arms. Mounting seats are sleeved on the outside of the pins. The mounting seats are fixed to one side of the tension plate by bolts.

[0018] As a preferred embodiment of the covering protection structure for blasting excavation of steep slopes described in this invention, the locking component includes a rotating column rotatably disposed inside the counterweight bar. The rotating column is provided with positive and negative threads at the positions corresponding to the three sets of connecting slots, and one end of the rotating column passes through the counterweight bar and is fixed with a screw head. Each set of positive and negative threads is threadedly connected to two movable sleeves, and the movable sleeves are directly movably connected to the connecting slots through a connector.

[0019] As a preferred embodiment of the covering protection structure for blasting excavation of steep slopes described in this invention, the connector includes a slot on one side of the movable sleeve and a fixed column fixed in the connecting slot. The fixed column is covered with a movable strip. Spring 1 is fixed on one side of the slot near two corners, and spring 2 is fixed on one side of the slot near the other two corners. A rotating block is rotatably connected inside the slot. A plug is rotatably connected to one end of the fixed column. A locking groove is provided on one side of the plug. A pressing block is slidably connected inside the slot near spring 2.

[0020] The beneficial effects of the present invention are as follows: The present invention uses a water tank to cover the top of the protective net. Water is added during protection, and the weight of the water replaces the traditional sandbags. The impact force generated during the explosion opens the water outlet through the ejection mechanism, thereby effectively suppressing the dust after the explosion.

[0021] The detachable connection between the protective net and the counterweight reduces the difficulty of on-site placement and facilitates subsequent recycling, making it more practical. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0023] Figure 1 This is a schematic diagram of the overall structure of the covered protective structure for blasting excavation of steep slopes according to the present invention.

[0024] Figure 2 This is a schematic diagram of the covering portion in the covered protection structure for blasting excavation of steep slopes according to the present invention.

[0025] Figure 3 This is a partial cross-sectional schematic diagram of the dust suppression component in the covered protective structure for blasting excavation of steep slopes according to the present invention.

[0026] Figure 4 For the present invention Figure 3 A magnified structural diagram of point A in the middle.

[0027] Figure 5 This is a schematic diagram of the connecting components in the covered protection structure for blasting excavation of steep slopes according to the present invention.

[0028] Figure 6 This is a schematic diagram of the connecting component in the covered protection structure for blasting excavation of steep slopes according to the present invention.

[0029] Figure 7 This is a schematic diagram of the tensile and locking components in the covered protective structure for blasting excavation of steep slopes according to the present invention.

[0030] Figure 8 For the present invention Figure 7 A magnified structural diagram at point B in the middle. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0035] Example 1

[0036] Reference Figure 1 A schematic diagram of the overall structure of a covered protective structure for blasting excavation of steep slopes is provided, as shown below. Figure 1-4 A covered protective structure for blasting excavation of steep slopes, comprising:

[0037] The covering portion 100 includes a protective net 101 and counterweight strips 102 located at both ends of the protective net 101. Both ends of the protective net 101 and the counterweight strips 102 are connected by tensile-resistant connecting components 103.

[0038] The protective net 101 has a mesh structure composed of several interlocking hexagonal iron rings, which has high strength and is more effective at blocking rolling stones.

[0039] The counterweight dust suppression part 200 includes a water tank 201 set above the protective net 101 and a connecting seat 202 fixed on the base surface of two counterweight bars 102 respectively. The bottom of the water tank 201 has holes 203 at equal intervals, and the bottom of the water tank 201 has water outlet holes 204 at equal intervals around the holes 203. A push-out mechanism 205 is installed in the holes 203.

[0040] Specifically, the water tank 201 is made of plastic, which has the advantages of being lightweight, inexpensive, and easy to move;

[0041] Furthermore, the ejection mechanism 205 includes an outer component 205a and an inner component 205b movably disposed inside the outer component 205a.

[0042] Furthermore, the outer component 205a includes an annular seat 205a-1 fixed to the bottom of the water tank 201 and communicating with the hole 203, and a movable column 205a-2 movably disposed inside the hole 203 and the annular seat 205a-1. A sealing plate 205a-3 is fixed on the top of the outer component 205a. The sealing plate 205a-3 is located inside the water tank 201 and covers the hole 203.

[0043] Specifically, the sealing plate 205a-3 has a disc-shaped structure, and a sealing gasket is fixed on the side of the sealing plate 205a-3 that is in contact with the water outlet 204, which can play a leak-proof role. The diameter of the sealing plate 205a-3 is larger than the area of ​​the water outlet 204, thus covering and blocking the water outlet 204.

[0044] Furthermore, the inner component 205b includes a rotary guide groove 205b-1 opened on the outside of the ring seat 205a-1 and a guide post 205b-2 fixed to the outer periphery of the movable post 205a-2, with the other end of the guide post 205b-2 inserted into the rotary guide groove 205b-1.

[0045] Furthermore, a top post 205b-3 is provided at the bottom of the movable post 205a-2 within the rotary guide groove 205b-1. The upper end of the top post 205b-3 moves within the ring seat 205a-1 via the movable disc 205b-4. An ejector spring 205b-5 connects the movable disc 205b-4 and the guide post 205b-2. A connecting post 206 is installed at the bottom of the water tank 201. A connecting groove is provided on the counterweight bar 102 at the position corresponding to the connecting post. The connecting post 206 is inserted into the connecting groove for connection.

[0046] Specifically, the rotary guide groove 205b-1 is arc-shaped and gradually rises, with a vertically downward groove at its highest point. Upon blasting, an impact is generated, causing the protective net 101 to bulge upwards. This bulging process pushes the top column 205b-3, which in turn moves the movable plate 205b-4 within the ring seat 205a-1, compressing the ejector spring 205b-5. The ejector spring 205b-5 then pushes the movable column 205a-2 upwards. The movable column 205a-2, under the same force, moves along the ring seat 205a-1, causing the sealing plate 205a-3 to move upwards, releasing it from the water outlet 20. The fit of 4 allows water in the water tank 201 to be discharged from the outlet 204, which can suppress dust generated during blasting and reduce the impact on the engineering environment. When the top column 205b-3 moves upward, the guide column 205b-2 at its outer end will be affected by the rotating guide groove 205b-1, so it will be forced to rotate while rising. When it reaches the top of the rotating guide groove 205b-1, it will fall into the slot, so the sealing plate 205a-3 will not fall down completely to block the outlet 204, thus achieving continuous water output and improving the dust control effect.

[0047] Specifically, caps are fixed at both ends of the ejector spring 205b-5, and the central axis of the two caps is rotatably connected to the movable column 205a-2 and the movable plate 205b-4 respectively, so that the movable column 205a-2 can rotate without restriction.

[0048] Operating Procedure: Before blasting, water is injected into water tank 201. During blasting, an impact is generated, causing the protective net 101 to bulge upwards. This bulging process pushes the top column 205b-3, which in turn moves the movable plate 205b-4 within the ring seat 205a-1, compressing the ejector spring 205b-5. The ejector spring 205b-5 then pushes the movable column 205a-2 upwards. The movable column 205a-2, under the same force, moves along the ring seat 205a-1, causing the sealing plate 205a-3 to move upwards, releasing its contact with the water outlet 204. Consequently, the water in water tank 201 is discharged from the water outlet 204, thus protecting the water generated during the blast. Dust is suppressed, reducing the impact on the engineering environment. When the top column 205b-3 moves upward, its outer guide column 205b-2 is affected by the rotating guide groove 205b-1, so it will be forced to rotate while rising. When it reaches the top of the rotating guide groove 205b-1, it will fall into the slot, thus preventing the sealing plate 205a-3 from completely falling down and blocking the water outlet 204. Therefore, continuous water output can be achieved, improving the dust control effect. This structure uses the weight of the water source to replace several traditional sandbags. The impact force generated during the explosion opens the water outlet through the ejection mechanism 205, thereby effectively suppressing the dust after the explosion.

[0049] Example 2

[0050] Reference Figure 5-7 The difference between this embodiment and the first embodiment is that the tensile connection assembly 103 includes a tensile member 103a, one side of the tensile member 103a is connected to the protective net 101 through a connector 103b, and the other side of the tensile member 103a is connected to the counterweight bar 102 through a locking member 103c.

[0051] Furthermore, the tensile member 103a includes a fixed plate 103a-1 and a tension plate 103a-2 located on one side of the fixed plate 103a-1. Three sets of connecting grooves 103a-3 are equally spaced on one side of the fixed plate 103a-1, with two grooves in each set. Guide posts 103a-4 are equally spaced on one side of the fixed plate 103a-1. The other end of each guide post 103a-4 passes through the tension plate 103a-2 and a tension spring 103a-5 is sleeved on the outside of the guide post 103a-4 extending out of the tension plate 103a-2.

[0052] Furthermore, the connector 103b includes a first connecting sleeve 103b-1 and a second connecting sleeve 103b-2. A movable arm 103b-3 is fixed to one side of both the fixed plate 103a-1 and the tension plate 103a-2. A pin 103b-4 is rotatably connected to the end of the two movable arms 103b-3. A mounting seat 103b-5 is sleeved on the outside of the pin 103b-4. The mounting seat 103b-5 is fixed to one side of the tension plate 103a-2 by bolts.

[0053] Specifically, connecting sleeve 103b-1 and connecting sleeve 2 103b-2 are respectively fitted onto the two inclined posts of the hexagonal iron ring to fix the corners of the protective net 101, thus achieving a firm connection.

[0054] The rest of the structure is the same as in Example 1.

[0055] Operation process: During assembly, the counterweight 102 is first placed at both ends of the blast zone. At the same time, the tensile member 103a is connected to the counterweight 102 through the locking member 103c. When the blast is impacted, the protective net 101 bulges upward and stretches the tension plate 103a-2. The tension plate 103a-2, under the force, moves along the guide post 103a-4 and applies force to the tension spring 103a-5, compressing the tension spring 103a-5. This can play a certain role in resisting tension and avoid the problem of tearing easily when the connection of the transmission protective net 101 is rigidly connected, which is prone to tearing under instantaneous impact. This effectively protects the service life of the protective net 101, avoids protective gaps due to tearing, improves the protective effect, and reduces the maintenance cost of the protective net 101 due to damage.

[0056] Example 3

[0057] Reference Figure 8This embodiment differs from the previous embodiment in that: the engaging component 103c includes a rotating column 103c-1 rotatably disposed inside the counterweight bar 102. The rotating column 103c-1 is provided with positive and negative threads 103c-2 at the positions corresponding to the three sets of connecting grooves 103a-3. One end of the rotating column 103c-1 passes through the counterweight bar 102 and is fixed with a screw head 103c-3. The positive and negative thread sections of each set of positive and negative threads 103c-2 are threadedly connected to a movable sleeve 103c-4. The movable sleeve 103c-4 and the connecting groove 103a-3 are directly and movably connected to each other through a connector 103c-5.

[0058] Specifically, an opening is provided on one side of the counterweight bar 102 at the position corresponding to the rotating column 103c-1, and the rotating column 103c-1 is placed into the opening. The positive and negative thread sections of each set of positive and negative threads 103c-2 correspond to the two grooves of each set of connecting grooves 103a-3.

[0059] Furthermore, the connector 103c-5 includes a slot 103c-5a formed on one side of the movable sleeve 103c-4 and a fixing post 103c-5b fixed in the connecting groove 103a-3. A movable strip 103c-5c is fitted around the outside of the fixing post 103c-5b. Springs 103c-5d are fixed to the inside of the slot 103c-5a near both corners. The inside of the slot 103c-5a is also near the other... Spring 103c-5e is fixed at both outer corners. Rotating block 103c-5f is rotatably connected inside the slot 103c-5a. Insert block 103c-5g is rotatably connected to one end of the fixed post 103c-5b. Locking groove 103c-5h is opened on one side of the insert block 103c-5g. Pressing block 103c-5i is slidably connected inside the slot 103c-5a near the side of spring 103c-5e.

[0060] Specifically, the rotating block 103c-5f has a bird-shaped structure. Its tail presses on the spring 103c-5d and is located below the pressing block 103c-5i, and is fixedly connected to it. The beak is a protruding structure, which is adapted to the locking groove 103c-5h. A rotating shaft is installed in the belly of the bird, so the belly is the pivot point of rotation. After rotation, the beak and the tail can rotate relative to each other.

[0061] The rest of the structure is the same as in Example 2.

[0062] Operation process: When connecting, insert one end of the plug 103c-5g into the slot 103c-5a. During the insertion process, one end of the plug 103c-5g will abut against the beak of the rotating block 103c-5f. The beak will rotate around the belly of the bird under the pushing force. At the same time, the tail presses down on the spring 103c-5d. When the locking groove 103c-5h inside the plug 103c-5g moves to the beak, the beak is not restricted. Under the reaction force of the spring 103c-5d, the rotating block 103c-5f will rotate until the beak is locked into the locking groove 103c-5h to complete the locking.

[0063] During disassembly, press the pressing block 103c-5i, push the bird tail of the rotating block 103c-5f to rotate it, and press the spring 103c-5d, so that the bird beak disengages from the locking groove 103c-5h, and the insert block 103c-5g can be pulled out, thus completing the disassembly. This structure has the advantages of easy disassembly and assembly, reduces the difficulty of on-site placement, and facilitates subsequent recycling, making it more practical.

[0064] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0065] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0066] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A covered protective structure for blasting excavation of steep slopes, characterized in that: include: The covering part (100) includes a protective net (101) and counterweights (102) located at both ends of the protective net (101). The two ends of the protective net (101) and the counterweights (102) are connected by tensile connection components (103). The counterweight dust suppression part (200) includes a water tank (201) set above the protective net (101) and a connecting seat (202) fixed on the base surface of the two counterweight bars (102) respectively. The bottom of the water tank (201) is provided with holes (203) at equal intervals, and the bottom of the water tank (201) is provided with water outlet holes (204) at equal intervals around the holes (203). A push-out mechanism (205) is installed in the holes (203). The ejection mechanism (205) includes an outer component (205a) and an inner component (205b) movably disposed inside the outer component (205a); The outer component (205a) includes a ring seat (205a-1) fixed to the bottom of the water tank (201) and communicating with the hole (203) and a movable column (205a-2) movably disposed inside the hole (203) and the ring seat (205a-1). A sealing plate (205a-3) is fixed on the top of the outer component (205a). The sealing plate (205a-3) is located inside the water tank (201) and covers the hole (203). The inner component (205b) includes a rotary guide groove (205b-1) opened on the outside of the ring seat (205a-1) and a guide post (205b-2) fixed to the outer periphery of the movable post (205a-2), with the other end of the guide post (205b-2) inserted into the rotary guide groove (205b-1). A top post (205b-3) is provided at the bottom of the movable post (205a-2) within the rotary guide groove (205b-1). The upper end of the top post (205b-3) moves within the ring seat (205a-1) via a movable disc (205b-4). An ejector spring (205b-5) is connected between the movable disc (205b-4) and the guide post (205b-2).

2. The covered protective structure for blasting excavation of steep slopes as described in claim 1, characterized in that: The tensile connection assembly (103) includes a tensile member (103a), one side of which is connected to the protective net (101) via a connector (103b), and the other side of which is connected to the counterweight bar (102) via a locking member (103c).

3. The covered protective structure for blasting excavation of steep slopes as described in claim 2, characterized in that: The tensile member (103a) includes a fixed plate (103a-1) and a tension plate (103a-2) located on one side of the fixed plate (103a-1). Three sets of connecting grooves (103a-3) are equally spaced on one side of the fixed plate (103a-1), with two grooves in each set. Guide posts (103a-4) are equally spaced on one side of the fixed plate (103a-1). The other end of each guide post (103a-4) passes through the tension plate (103a-2). Tension springs (103a-5) are sleeved on the outside of the guide post (103a-4) extending out of the tension plate (103a-2).

4. The covered protective structure for blasting excavation of steep slopes as described in claim 3, characterized in that: The connector (103b) includes a first connecting sleeve (103b-1) and a second connecting sleeve (103b-2). Movable arms (103b-3) are fixed to one side of both the fixed plate (103a-1) and the tension plate (103a-2). Pins (103b-4) are rotatably connected to the ends of the two movable arms (103b-3). A mounting seat (103b-5) is sleeved on the outside of the pin (103b-4). The mounting seat (103b-5) is fixed to one side of the tension plate (103a-2) by bolts.

5. The covered protective structure for blasting excavation of steep slopes as described in claim 4, characterized in that: The locking component (103c) includes a rotating column (103c-1) rotatably disposed inside the counterweight bar (102). The rotating column (103c-1) is provided with positive and negative threads (103c-2) at the positions corresponding to the three sets of connecting grooves (103a-3). One end of the rotating column (103c-1) passes through the counterweight bar (102) and is fixed with a screw head (103c-3). Each set of positive and negative threads (103c-2) is threadedly connected to two movable sleeves (103c-4). The movable sleeves (103c-4) are directly movably connected to the connecting grooves (103a-3) through a connector (103c-5).

6. The covered protective structure for blasting excavation of steep slopes as described in claim 5, characterized in that: The connector (103c-5) includes a slot (103c-5a) formed on one side of the movable sleeve (103c-4) and a fixing post (103c-5b) fixed in the connecting groove (103a-3). The fixing post (103c-5b) is fitted with a movable strip (103c-5c). Springs (103c-5d) are fixed to the inside of the slot (103c-5a) near two corners, and springs (103c-5d) are fixed to the inside of the slot (103c-5a) near the other two corners. Spring 2 (103c-5e) is fixed at each corner. Rotating block (103c-5f) is rotatably connected inside the slot (103c-5a). Insert block (103c-5g) is rotatably connected to one end of the fixed column (103c-5b). Locking groove (103c-5h) is opened on one side of the insert block (103c-5g). Pressing block (103c-5i) is slidably connected inside the slot (103c-5a) near the side of spring 2 (103c-5e).

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