A device for facilitating initial support construction of tunnel

Abstract

The present invention relates to a device for facilitating initial tunnel support construction, comprising at least one baffle, wherein a gap is provided between the baffle and the bottom surface of an upper step, and the width of the baffle is adapted to the thickness of the sprayed concrete required for the upper step. By installing the baffle of the device for facilitating initial tunnel support construction above the bottom surface of the upper step, a gap is formed between the baffle and the bottom surface of the upper step. Since the width of the baffle is adapted to the thickness of the sprayed concrete required for the upper step, it can be ensured that the baffle can cover the bottom of the upper step, so that the concrete sprayed in the gap between the baffle and the bottom surface of the upper step is reduced during the spraying of concrete, and the concrete sprayed on the steel arch frame and the steel mesh at the bottom of the upper step is also reduced. Therefore, there is no need to chisel out the concrete sprayed at the bottom of the upper step, and only the concrete sprayed at the bottom of the steel arch frame and the bottom of the steel mesh needs to be simply removed, thereby saving manpower and construction time.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel excavation support construction, in particular to a device for facilitating initial tunnel support construction. Background Art

[0002] The excavation construction of highway tunnels in mountainous areas mostly adopts mining excavation, and different mining excavation methods are adopted according to different surrounding rock types. For example, the stability of grade I, II, and III surrounding rock is better, and full-section excavation is adopted; while the stability of grade IV and V surrounding rock is poor, and mechanical excavation or local blasting methods are mostly adopted, such as: upper and lower step method or three-step method.

[0003] According to the relevant specifications and regulations, the support system must be constructed immediately after the excavation of the face, and the invert arch must be constructed as soon as possible during the excavation of the IV and V grade surrounding rock. Therefore, during the implementation process, it is necessary to connect the steel arch frame of the lower step with the steel arch frame that has been constructed on the upper step, and to connect the steel mesh of the lower step with the steel mesh that has been constructed on the upper step. However, before the construction of the lower step, the upper step undergoes the concrete spraying step, resulting in the arch frame and steel mesh at the bottom of the upper step being buried. In order to connect the steel arch frame and steel mesh of the lower step with the steel arch frame and steel mesh that have been constructed on the upper step, the traditional practice requires the concrete at the bottom of the upper step that has been sprayed with concrete to be chiseled off before connection. This method is both labor-intensive and time-consuming. Summary of the invention

[0004] The purpose of the present invention is to provide a device for facilitating the initial support construction of a tunnel in view of the problem that in the prior art, when the steel arch frame and steel mesh of the lower step are connected to the steel arch frame and steel mesh of the upper step according to the traditional practice, the concrete at the bottom of the upper step that has been sprayed with concrete needs to be chiseled out first, which wastes manpower and construction time. When the device for facilitating the initial support construction of a tunnel is used for spraying concrete on the upper step, the bottom of the upper step can be shielded by installing the device for facilitating the initial support construction of the tunnel in advance, thereby reducing the amount of concrete sprayed at the bottom of the upper step during the spraying process. There is no need to chisel out the concrete sprayed at the bottom of the upper step, and only the concrete sprayed at the bottom of the steel arch frame and the bottom of the steel mesh needs to be simply removed, thereby saving manpower and construction time.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A device for facilitating initial tunnel support construction comprises at least one baffle plate, a gap is provided between the baffle plate and the bottom surface of an upper step, and the width of the baffle plate is adapted to the thickness of the sprayed concrete required for the upper step.

[0007] Wherein, the size of the gap is greater than or equal to 30 times the diameter of the steel bar to meet the overlap length of the steel mesh of the upper step and the steel mesh of the lower step.

[0008] The bottom surface of the upper step refers to the bottom surface formed after the excavation of the upper step, and is also the top surface of the upper step. The device for facilitating the initial support construction of the tunnel takes effect when the upper step is sprayed with concrete, that is, before the upper step is sprayed with concrete, the device for facilitating the initial support construction of the tunnel is installed, that is, the baffle is installed above the bottom surface of the upper step to form a gap between the baffle and the bottom surface of the upper step, and the baffle is set against the rock surface. Among them, the installation method of the baffle can be supported from below or hoisted from above, and when the baffle is set against the rock surface, it can be set perpendicular to the rock surface, or it can be set at an inclined angle with the rock surface. The rock surface refers to the inner wall surface of the tunnel during the initial support of the construction. Because the width of the baffle is adapted to the thickness of the sprayed concrete required for the upper step, it can be ensured that the baffle can cover the bottom of the upper step, so that the concrete sprayed at the bottom of the upper step during the spraying process is reduced, that is, the concrete sprayed in the gap between the baffle and the bottom surface of the upper step is reduced, and the concrete sprayed on the steel arch frame and the steel mesh at the bottom of the upper step is also reduced. There is no need to chisel out the sprayed concrete at the bottom of the upper step, and only the concrete sprayed at the bottom of the steel arch frame and the bottom of the steel mesh needs to be simply cleared, thereby saving manpower and construction time.

[0009] Preferably, the baffle is arranged at a height of 200-300 mm above the bottom surface of the upper step.

[0010] Installing the baffle at the above position can, firstly, ensure the lap length between the bottom of the upper step steel mesh and the top of the lower step steel mesh; secondly, because the initial support of the tunnel requires the excavated part to be sprayed with concrete and sealed as soon as possible, setting the baffle at a height of 200-300mm on the upper step can avoid the large area of ​​the upper step rock surface that has not been sprayed with concrete due to the baffle being set too high from the upper step bottom plate, thereby avoiding poor quality of initial support construction.

[0011] Preferably, a side of the baffle plate for contacting the rock surface is provided with a plurality of slots, and the slots are used to adapt to the vertical bars of the steel mesh.

[0012] The number, shape and size of the slots are adapted to the number, shape and size of the vertical bars of the steel mesh corresponding to the baffle.

[0013] Steel mesh refers to a steel mesh formed by the cross connection of horizontal and vertical bars. The direction of the baffle perpendicular to the rock surface is the lateral direction, the side close to the rock surface is the inner side, and the side away from the rock surface is the outer side; by setting the slot on the inner side of the baffle, the slot serves as a reserved channel, so that the vertical bars of the upper step steel mesh can pass through the slot, so that the side of the baffle can better abut against the rock surface, thereby increasing the effective coverage area of ​​the baffle that can block the bottom of the upper step, and reducing the impact on the bottom of the upper step when spraying concrete on the upper step.

[0014] Preferably, the baffle is an inclined plate, and one side of the baffle used to abut the rock surface is lower than the other side opposite thereto. The baffle is set as an inclined plate, and the slope of the inclined plate faces the rock surface. Firstly, the concrete sprayed on the upper step can be better supported above the baffle, so as to avoid the sprayed concrete splashing to the side of the baffle away from the rock surface and causing concrete accumulation, which leads to construction difficulties; at the same time, the height of the side of the baffle away from the rock surface can be increased when the baffle is working, thereby increasing the construction space on this side, which is beneficial to the later construction.

[0015] Preferably, the inclination angle between the baffle and the horizontal plane is 15°-30°, which further increases the construction space on the side of the baffle away from the rock surface and reduces the impact on the final quality of the upper step after spraying concrete.

[0016] Preferably, a support member is provided below the baffle, the upper portion of the support member supports the baffle, and the lower portion of the support member abuts against the bottom surface of the upper step.

[0017] The support member is used to support the baffle at a specified height from the bottom surface of the upper step, which can provide a supporting height for the baffle and provide a bearing capacity for the baffle, so as to keep the baffle able to stably block the concrete sprayed from above and avoid the baffle being damaged due to excessive load acting on the baffle after spraying concrete on the upper step.

[0018] Preferably, two support members are provided under each baffle, and the two support members are provided at both ends of the corresponding baffle. The two support members support the two ends of the baffle, which can better ensure the stability of the baffle.

[0019] Preferably, a groove is provided in the middle of the support member, and the groove is used to adapt to the steel arch frame of the upper step. The shape and size of the two ends of the baffle are adapted to the shape and size of the corresponding side surfaces of the steel arch frame, and the length of the baffle is adapted to the spacing between two adjacent steel arch frames.

[0020] The steel arch frames of the upper steps are distributed at intervals along the rock surface of the tunnel. The steel arch frames can be made of H-shaped steel or I-shaped steel, etc., which include a web located in the middle and flange plates located on both sides of the web. The side surfaces of the steel arch frames refer to the inner side surfaces formed by the web and the flange plates on both sides. A groove is provided in the middle of the support member for enclosing the bottom of the steel arch frame in the groove; the baffle is provided at one end along the longitudinal direction of the tunnel, and the side surface of one end of the baffle is placed on the support member and is adapted to abut against the corresponding side of the steel arch frame, thereby preventing concrete from entering the groove through the gap between the groove and the steel arch frame when spraying concrete on the upper step, thereby reducing the concrete sprayed on the bottom of the steel arch frame of the upper step, and reducing the concrete sprayed on the bottom of the upper step, which is convenient for connecting the steel mesh of the lower step with the steel mesh that has been applied on the upper step; by arranging the support member and the baffle at the same time, the support member can provide support for the baffle and cooperate with the baffle to enclose the bottom of the steel arch frame of the upper step; and the baffle can block the area below between the two support members, thereby protecting the bottom of the steel arch frame and the bottom of the steel mesh of the upper step at the same time, reducing the concrete sprayed on the bottom of the steel mesh and the bottom of the steel arch frame of the upper step. And the length of the baffle is adapted to the spacing between two adjacent steel arches, that is, the baffle is processed according to the spacing between adjacent steel arches. During the installation of the baffle: if the distance between the two sides of the baffle and the steel arch is too large; or the baffle cannot be connected to the two supports, that is, the baffle cannot be placed between two adjacent steel arches; the above two situations can indicate that the installation of the steel arch does not meet the requirements, that is, the baffle can be used to judge the installation of the upper step steel arch. In addition, when the on-site steel arch is installed according to the measurement and layout, it can be determined whether there is over-excavation at this location based on the distance between the rock surface and the baffle after the baffle is installed, and then the upper step excavation parameters of the next cycle can be adjusted in time.

[0021] Preferably, the support member includes two support parts, the support parts are rectangular parallelepiped components, the two support parts are connected by a connecting plate, the two support parts and the connecting plate are adapted to form the groove, and the baffle is placed on the support parts.

[0022] The support part is a rectangular component, which is easy to process. The two rectangular support parts are connected by the connecting plate, and the opposite sides of the two support parts cooperate with the connecting plate to form a groove for enclosing the steel arch frame. The notch of the groove is located on the side of the support member close to the rock surface, which is convenient for installing the steel arch frame into the groove; it is also convenient for removing the support member after spraying concrete on the steps, so that it can be reused. The two support parts on both sides of the steel arch frame can respectively support the baffles on both sides of the support member, and the two baffles are respectively abutted from the sides of both sides of the steel arch frame, thereby covering the gap between the groove and the steel arch frame, and preventing the sprayed concrete from condensing on the bottom of the steel arch frame.

[0023] Preferably, the support portion is a hollow structure, which can save materials and reduce its own weight for easy transportation.

[0024] Preferably, the inner surface of the groove is adapted to the contour surface of the steel arch.

[0025] The inner surface of the groove can completely fit the contour surface of the steel arch frame, thereby reducing the gap between the steel arch frame and the groove, thereby protecting the bottom of the steel arch frame and preventing concrete from solidifying at the bottom of the steel arch frame. When installing the support member, it needs to be slidably connected along the longitudinal direction of the steel arch frame.

[0026] Preferably, both the support member and the baffle are provided with handles.

[0027] The support member is easy to carry, install and remove; the baffle is easy to carry, install and remove.

[0028] Preferably, a handle is provided on the outer side of each of the two support parts, and a handle is provided below the side of the baffle away from the rock surface.

[0029] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0030] 1. The device for facilitating initial tunnel support construction of the present invention forms a gap between the baffle and the bottom surface of the upper step by installing at least one baffle above the bottom surface of the upper step, and the baffle is arranged in contact with the rock surface. Since the width of the baffle is adapted to the thickness of the sprayed concrete required for the upper step, it can be ensured that the baffle can cover the bottom of the upper step, so that less concrete is sprayed at the bottom of the upper step during the spraying of concrete, that is, the concrete sprayed in the gap between the baffle and the bottom surface of the upper step is reduced, and the concrete sprayed on the steel arch frame and the steel mesh at the bottom of the upper step is also reduced. Therefore, there is no need to chisel out the sprayed concrete at the bottom of the upper step, and only the sprayed concrete at the bottom of the steel arch frame and the bottom of the steel mesh needs to be simply cleared, thereby saving manpower and construction time.

[0031] 2. The baffle is installed on the rock surface at a height of 200-300mm above the bottom surface of the upper step. Firstly, it can ensure the overlap length between the bottom of the upper step steel mesh and the top of the lower step steel mesh. Secondly, because the initial support of the tunnel requires the excavation part to be sprayed with concrete as soon as possible, setting the baffle at a height of 200-300mm of the upper step can avoid the large area of ​​the upper step rock surface that is not sprayed with concrete due to the baffle being set too high from the bottom plate of the upper step, thereby avoiding poor quality of initial support construction.

[0032] 3. The support member of the device for facilitating initial tunnel support construction of the present invention is used to support the baffle at a specified height above the bottom surface of the upper step, which can provide a support height for the baffle and provide a bearing capacity for the baffle, so that the baffle can stably block the concrete sprayed from above, and avoid the baffle being damaged due to excessive load acting on the baffle after the concrete is sprayed on the upper step.

[0033] 4. The support member includes a rectangular support part on both sides and a connecting plate connecting the two support parts. The opposite surfaces of the two support parts cooperate with the connecting plate to form a groove for protecting the bottom of the steel arch frame. The notch of the groove is located on the side of the support member, which is convenient for installing the steel arch frame into the groove; it is also convenient for withdrawing the support member after spraying concrete on the upper step, so that it can be reused. At the same time, the end face of the end of the baffle plate placed on the support member is adapted to the side of the steel arch frame. Through the abutment between the end face of the baffle plate and the side of the steel arch frame, the gap between the steel arch frame and the groove can be blocked, thereby preventing the concrete from entering the groove through the gap between the groove and the steel arch frame when spraying concrete on the upper step, thereby preventing the sprayed concrete from condensing at the bottom of the steel arch frame, and reducing the concrete at the bottom of the upper step, so as to facilitate the connection of the steel mesh of the lower step with the steel mesh that has been applied on the upper step.

[0034] 5. The length of the baffle of the device for facilitating initial tunnel support construction of the present invention is adapted to the spacing between two adjacent steel arch frames. When the baffle is installed, the installation status of the upper step steel arch frame can be judged by the installation status of the baffle. In addition, when the on-site steel arch frame is installed according to the measurement and layout, it can be determined whether there is over-excavation at the location according to the distance between the rock surface and the baffle after the baffle is installed, and then the upper step excavation parameters of the next cycle can be adjusted in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic elevation view of the device for facilitating initial tunnel support construction described in Example 1;

[0036] Figure 2 It is a schematic plan view of the device for facilitating initial tunnel support construction described in Example 1;

[0037] Figure 3 It is a schematic diagram of the structure of the support member in Example 1.

[0038] Icons: 1-support; 11-groove; 12-support part; 13-connecting plate; 2-baffle; 21-slot; 3-steel arch; 31-arch connecting plate; 4-steel mesh; 5-rock surface; 6-handle. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] Example 1

[0042] This embodiment provides a device that facilitates the initial support construction of a tunnel. Figure 1-3 , comprising at least one baffle 2, with a gap between the baffle 2 and the bottom surface of the upper step, and the width of the baffle 2 being adapted to the thickness of the shotcrete required for the upper step.

[0043] The size of the gap is greater than or equal to 30 times the diameter of the steel bar to meet the overlap length of the steel mesh 4 of the upper step and the steel mesh 4 of the lower step.

[0044] The bottom surface of the upper step refers to the bottom surface formed after the upper step is excavated, and is also the top surface of the upper step. The device for facilitating the initial support construction of the tunnel takes effect when the upper step is sprayed with concrete, that is, before the upper step is sprayed with concrete, the device for facilitating the initial support construction of the tunnel is installed, that is, the baffle 2 is installed above the bottom surface of the upper step to form a gap between the baffle 2 and the bottom surface of the upper step, and the baffle 2 is set against the rock surface 5. Among them, the installation method of the baffle 2 can be supported from below or hoisted from above, and when the baffle 2 is set against the rock surface 5, it can be set perpendicular to the rock surface 5, or it can be set at an inclined angle with the rock surface 5. The rock surface 5 refers to the inner wall surface of the tunnel during the initial support of the construction.

[0045] Because the width of the baffle 2 is adapted to the thickness of the sprayed concrete required for the upper step, it is ensured that the baffle 2 can cover the bottom of the upper step, so that the concrete sprayed at the bottom of the upper step during the spraying process is reduced, that is, the concrete sprayed on the steel arch frame 3 and the steel mesh 4 at the bottom of the upper step can be reduced, and there is no need to chisel out the concrete sprayed at the bottom of the upper step. It is only necessary to simply clean the concrete sprayed at the bottom of the steel arch frame 3 and the bottom of the steel mesh 4, thereby saving manpower and construction time.

[0046] In this embodiment, the baffle 2 is supported by setting a support member 1 below it, so that the baffle 2 can be stably supported at a height of 200-300mm above the bottom surface of the upper step. The baffle 2 is set at a height of 200-300mm of the upper step. Firstly, it can ensure the lap length of the bottom of the upper step steel mesh 4 and the top of the lower step steel mesh 4; secondly, because the initial support of the tunnel requires the excavation part to be sprayed with concrete as soon as possible, setting the baffle 2 at a height of 200-300mm of the upper step will not cause the height of the upper step blocked by the baffle 2 to be large, that is, avoid a large area that is not sprayed with concrete, and thus avoid poor quality of initial support construction. Specifically, two support members 1 are provided below each baffle 2, and the two support members 1 are provided at the two ends of the corresponding baffle 2, and the upper part of the support member 1 supports the baffle 2, and the lower part abuts the bottom surface of the upper step.

[0047] In this embodiment, the support member 1 is arranged corresponding to the steel arch frame 3 of the upper step, and the steel arch frame 3 of the upper step is distributed at intervals along the rock surface 5 of the tunnel, such as Figure 1 As shown, the steel arch frame 3 includes a web located in the middle and flange plates located on both sides of the web. The steel arch frame 3 of this embodiment is an I-beam, and the inner concave surface is formed between the flange plates and the web on both sides of the I-beam, and the width direction of the web is perpendicular to the rock surface 5; and two adjacent support members 1 are used in conjunction with a baffle plate 2, that is, the longitudinal length of the baffle plate 2 is adapted to the spacing between two adjacent upper steps of the I-beam, and the specific implementation method needs to involve multiple baffle plates 2. For easy viewing, two support members 1 and one baffle plate 2 are used to show, as shown in FIG. Figure 1-2 .like Figure 3 The support member 1 includes two support parts 12 located on the left and right sides and a connecting plate 13 connecting the two support parts 12. Both support parts 12 are rectangular components with a hollow structure inside, such as: welded and processed by 6mm steel plates. Of course, other sizes and other materials can also be used according to the actual construction situation. The material should be high in strength and difficult to be destroyed by concrete. The connecting plate 13 can be made of a 10mm steel plate, which is welded in the middle of the two support plates to connect the two support parts 12. And the two support parts 12 of the support member 1 are each provided with a handle 6, the handle 6 of the left support part 12 is arranged on the left side, and the handle 6 of the right support part 12 is arranged on the right side.

[0048] In this embodiment, Figure 1-2As shown, the connecting plate 13 is arranged on the side of the support member 1 away from the rock surface 5, and the opposite surfaces of the two support parts 12 and the connecting plate 13 form a flat-bottomed U-shaped groove 11, and the groove 11 is a through groove, and the U-shaped through groove is used to enclose the bottom of the I-beam of the upper step. As a preferred embodiment, the inner surface of the groove 11 matches the contour surface of the I-beam, that is, the inner surface of the groove 11 can completely fit the contour surface of the steel arch 3, which can directly reduce the gap between the I-beam and the groove 11, thereby protecting the bottom of the I-beam and preventing the concrete from solidifying at the bottom of the I-beam. However, when installing the support member 1, it is necessary to slide along the longitudinal direction of the I-beam, which is inconvenient to install.

[0049] A baffle plate 2 is provided above the two support members 1. The baffle plate 2 is placed on two support parts 12 close to the middle of the two support members 1. The end face of one end of the baffle plate 2 placed on the support part 12 is adapted to the inner concave surface of the I-beam. The length of the baffle plate 2 is adapted to the spacing between two adjacent I-beams, so that both sides of the baffle plate 2 can block the gap between the I-beam and the groove 11. A plurality of slots 21 are provided on the side of the baffle plate 2 close to the rock surface 5. The slots 21 are reserved channels for the vertical bars of the steel mesh 4, which are used to adapt to the vertical bars of the steel mesh 4, so that the vertical bars of the upper step steel mesh 4 can pass through the slots 21, thereby enabling the side of the baffle plate 2 to better contact the rock surface 5. Figure 1 As shown in , each of the baffle plates 2 is provided with two slots 21, the cross section of the slots 21 is U-shaped, and the bottom of the slots is a plane, which is convenient for processing; as a preferred embodiment, the number, shape and size of the slots 21 are adapted to the number, shape and size of the vertical bars of the steel mesh 4 corresponding to the baffle plate 2, that is, the bottom of the slots 21 is an arc-shaped surface adapted to the vertical bars. A handle 6 is provided at the bottom of the side of the baffle plate 2 away from the rock surface 5. In this embodiment, the handle 6 is made of φ10 round steel bars into a hand pull ring at a suitable angle, so that the device for facilitating the initial support construction of the tunnel is easy to install and disassemble, and easy to carry.

[0050] When constructing the initial support of the upper step, first install the upper step I-beam and steel mesh 4 of the arch frame as required, and at this time, the bottom of the upper step I-beam is welded with an arch frame connecting plate 31; then the support member 1 of the device for facilitating the initial support construction of the tunnel described in this embodiment is installed corresponding to the I-beam, and the number of support members 1 required at this time is consistent with the number of I-beams of the arch frame; that is, the groove 11 of the support member 1 is pushed corresponding to the I-beam so that the bottom of the I-beam enters the groove 11; in the process of installing the baffle 2: if the distance between the two sides of the baffle 2 and the I-beam is too large; or the baffle 2 cannot be connected to the two support members 1, that is, the baffle 2 cannot be placed between two adjacent I-beams; the above two situations can both indicate that the installation of the I-beam does not meet the requirements, that is, the baffle 2 can be used to judge the installation status of the upper step I-beam. Then, the baffles 2 are correspondingly installed on the supporting parts 12 of two adjacent supporting members 1; when installing the baffles 2, it can be determined whether there is over-excavation at that location according to the distance between the rock surface 5 and the baffles 2 after the baffles 2 are installed, and then the excavation parameters of the upper step of the next cycle can be adjusted in time. Then, concrete is sprayed on the upper step.

[0051] When the upper step is sprayed with concrete, the bottom of the I-beam of the upper step is blocked by the support member 1 and the baffle plate 2, which reduces the concrete sprayed on the bottom of the I-beam of the upper step and can effectively block the bolt holes of the connecting steel plate at the root of the I-beam of the arch frame of the upper step when spraying concrete; at the same time, the bottom of the steel mesh 4 of the upper step is blocked by the baffle plate 2, which can prevent the bottom of the steel mesh 4 of the upper step from being wrapped by the sprayed concrete; the concrete sprayed on the bottom of the upper step is reduced, and there is no need to chisel out the concrete sprayed on the bottom of the upper step. It is only necessary to dismantle the device for facilitating the initial support construction of the tunnel, and simply clean the concrete sprayed on the bottom of the I-beam and the bottom of the steel mesh 4, so that the arch frame connecting plate 31 and the bottom of the steel mesh 4 at the bottom of the I-beam of the upper step can be exposed, thereby facilitating the connection of the I-beam of the upper step to the I-beam of the lower step; at the same time, it is convenient for the bottom of the steel mesh 4 of the upper step to be connected to the steel mesh 4 of the lower step.

[0052] In this embodiment, the materials and sizes of the support member 1, the baffle 2 and the handle 6 are determined according to the actual construction conditions, and the materials and sizes described above are for illustration only.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for facilitating initial tunnel support construction, characterized in that: The invention comprises at least one baffle (2), wherein a gap is provided between the baffle (2) and the bottom surface of the upper step, the baffle (2) is arranged to abut against a rock surface (5), the baffle (2) is an inclined plate, one side of the baffle (2) abutting against the rock surface (5) is lower than the other side opposite thereto, and the inclination angle of the baffle with respect to the horizontal plane is 15°-30°; the width of the baffle (2) is adapted to the thickness of the sprayed concrete required for the upper step; The baffle (2) is used to be arranged at a height of 200-300 mm above the bottom surface of the upper step; a plurality of slots (21) are provided on one side of the baffle (2) for contacting the rock surface (5), and the slots (21) are used to fit the vertical bars of the steel mesh (4); a support member (1) is provided below the baffle (2), and the upper part of the support member (1) supports the baffle (2) and the lower part contacts the bottom surface of the upper step; two support members (1) are provided below each baffle (2), and the two support members (1) are provided at the two ends of the corresponding baffle (2); a groove (11) is provided in the middle of the support member (1), and the groove (11) is used to fit the vertical bars of the upper step; The steel arch frame (3) of the step, the shapes and sizes of the two ends of the baffle (2) are adapted to the shapes and sizes of the corresponding sides of the steel arch frame (3), and the length of the baffle (2) is adapted to the spacing between two adjacent steel arch frames (3); the support member (1) includes two support parts (12), the support part (12) is a rectangular parallelepiped member, the two support parts (12) are connected by a connecting plate (13), the two support parts (12) and the connecting plate (13) are adapted to form the groove (11), and the baffle (2) is placed on the support part (12); the inner surface of the groove (11) is adapted to the contour surface of the steel arch frame (3).

2. The device for facilitating initial tunnel support construction according to claim 1, characterized in that: The support member (1) and the baffle (2) are both provided with handles (6).

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