Auxiliary installation device for tunnel forepoling small guide pipe

Abstract

The utility model provides an auxiliary mounting device for a tunnel forepoling small conduit, which comprises a hollow guide cylinder with two open ends, two groups of length-adjustable fixing parts respectively arranged on two sides of the front end of the guide cylinder, and rotating shafts fixedly arranged on two sides of the front end of the guide cylinder and respectively rotationally connected with the fixing parts, the guide device comprises a guide cylinder, a movable seat located on the lower portion of the front end of the guide cylinder, and an adjusting piece arranged between the movable seat and the guide cylinder and used for driving the guide cylinder to rotate. It is ensured that the drill rod and the advanced small guide pipe can accurately penetrate into the preset position according to the preset angle, installation angle deviation caused by artificial factors and complex rock stratum conditions is effectively reduced, the accuracy of the installation angle of the advanced supporting small guide pipe is effectively guaranteed, the advanced supporting effect of the advanced supporting small guide pipe is fully achieved, and therefore the reinforcing effect on surrounding rock is improved; and the quality and safety of tunnel construction are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of house waterproof, concretely relates to a tunnel advance support small catheter auxiliary installation device. BACKGROUND

[0002] In tunnel construction, the advance support small catheter plays a very key role, it can pre-reinforce the unstable surrounding rock in front before tunnel excavation, effectively enhance the strength and stability of surrounding rock, prevent the collapse and other safety accidents in the excavation process, and has the indispensable significance for controlling stratum settlement, guaranteeing construction safety and ensuring the long-term stability of tunnel structure.

[0003] The main installation method of the existing advance small catheter includes drilling installation method and top-in installation method, the drilling installation method usually drills the drilling hole that meets the design angle and depth requirement on the tunnel face by using the drilling equipment when the rock stratum is hard, then inserts the advance small catheter into the hole and carries out subsequent grouting reinforcement work, the top-in installation method directly tops the advance small catheter into the position set in advance by using external force when the rock stratum is hard, however, whether the drilling installation method or the top-in installation method, in the actual operation process of the construction personnel, the deviation is often difficult to detect due to the limited visual judgment of the construction personnel, the power control imbalance and direction deviation caused by fatigue due to long time manual work, and the uneven resistance and lateral force caused by the factors such as the variable rock stratum characteristics, hardness mutation, joint fissure and complex geological structure, so that the installation angle of the small catheter deviates, and then the reinforcement effect on the surrounding rock is affected, the advance support small catheter cannot fully play its due role, and the safety risk and quality hidden danger in the tunnel construction process are increased. SUMMARY

[0004] The utility model aims at providing a tunnel advance support small catheter auxiliary installation device, solves the problem in the above background art.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] A tunnel advance support small catheter auxiliary installation device, including two ends open, the hollow guide cylinder of inside, two groups of fixed parts are arranged respectively in the two sides of the front end of the guide cylinder, and the length is adjustable, the rotating shaft is fixedly arranged in the two sides of the front end of the guide cylinder, and is respectively connected with the fixed part, the moving seat is located in the lower part of the front end of the guide cylinder, and the adjusting part is arranged between the moving seat and the guide cylinder, drives the rotation of the guide cylinder.

[0007] Preferably, the moving seat includes: the upper roller and the lower roller that are symmetrically arranged up and down, the upper support and the lower support that are respectively installed the upper roller and the lower roller, and the adjusting part that is connected between the upper support and the lower support and is used for adjusting the distance between the upper roller and the lower roller.

[0008] Preferably, the upper support and the lower support are both L-shaped, the upper support comprises an upper vertical plate and an upper horizontal plate connected to the lower end of the upper vertical plate, the upper roller is rotatably connected to the outer side upper end of the upper vertical plate, the lower support comprises a lower vertical plate slidably connected to the outer side of the upper vertical plate and a lower horizontal plate connected to the lower end of the lower vertical plate, the roller is rotatably connected to the outer side upper end of the lower vertical plate, and the adjusting member is an adjusting screw threadedly penetrating the lower horizontal plate and rotatably connected to the upper horizontal plate at one end.

[0009] Preferably, the adjusting member comprises a hinge seat fixedly arranged on the outer side wall of the lower end of the guide cylinder, a mounting head hingedly connected to the hinge seat, an adjusting screw threadedly penetrating the upper horizontal plate and rotatably connected to the mounting head at one end, and an extension rod connected at one end to the outer side wall of the lower end of the guide cylinder and fixedly connected at the other end to the upper end surface of the upper horizontal plate.

[0010] Preferably, the fixing member comprises a connecting cylinder, an upper fixing rod slidably connected in the connecting cylinder at the lower end, a lower fixing rod slidably connected in the connecting cylinder at the upper end, a rotating sleeve rotatably sleeved on the upper and lower ends of the connecting cylinder, and a threaded rotating sleeve fixedly connected to the rotating sleeve and threadedly connected to the upper and lower fixing rods.

[0011] Preferably, the upper end of the upper fixing rod and the lower end of the lower fixing rod are both provided with flexible rubber pads.

[0012] Preferably, the positioning member arranged in the guide cylinder comprises a positioning plate arranged in the guide cylinder, a positioning screw threadedly penetrating the top of the guide cylinder and rotatably connected to the positioning plate, a positioning guide rod movably penetrating the top of the guide cylinder and fixedly connected to the positioning plate, and a plurality of balls arranged on the lower end surface of the positioning plate and the bottom of the inner side wall of the guide cylinder.

[0013] Preferably, the clamping members arranged on both sides of the guide cylinder respectively comprise clamping screws threadedly penetrating the side walls of the guide cylinder respectively, arc-shaped clamping plates arranged in the guide cylinder and rotatably connected to the end portions of the two clamping screws respectively, clamping guide rods movably penetrating the side walls of the guide cylinder and fixedly connected to the clamping plates respectively, and flexible rubber pads arranged on the opposite side surfaces of the two arc-shaped clamping plates respectively.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] 1. The utility model discloses a length adjustable fixing piece can make the device flexible installation on different model tunnel steel arch, through the adjustment piece drive guide cylinder rotates and then adjust the inclination angle of guide cylinder, provide a stable accurate guide channel for the penetration of drill pipe and advance small catheter, ensure that drill pipe and advance small catheter can be according to the preset angle precision and penetrate the scheduled position, effectively reduce the installation angle deviation caused by artificial factors and complex strata, effectively guarantee the accuracy of advance support small catheter installation angle, give full play to its advance support effect, thereby improve the reinforcement effect to surrounding rock, improve the quality and safety of tunnel construction,

[0016] 2. The utility model discloses a mobile seat is arranged on the I -beam lower wing plate and is convenient for quick movement and positioning device, reduce the time of manual handling and adjustment, the spacing between the upper support and lower support can be adjusted by adjusting screw rod, and the spacing between the upper roller and the lower roller can be adjusted, and the upper roller and the lower roller can be clamped on the I -beam lower wing plate of different thickness, improving the stability and flexibility of the device.

[0017] 3. The utility model discloses a rotating screw sleeve, which can make the upper fixed rod and the lower fixed rod extend or retract the connecting cylinder, thereby changing the overall length of the fixing piece, so that the fixing piece can be firmly abutted on the upper and lower wing plates of the I -beam with different spacing, thereby improving the applicability of the device in installing on different specifications of I -beam arches. By providing flexible rubber pads on the upper end of the upper fixed rod and the lower end of the lower fixed rod, the pressure on the wing plate during the construction of the drill pipe and the advance small catheter can be buffered, and the fixed rod can better fit the I -beam wing plate, improving the friction between the fixed rod and the wing plate and enhancing the stability of the device in installing on the I -beam arch.

[0018] 4. The utility model discloses a rotating positioning screw, which can make the positioning plate move up and down in the guide cylinder, so that the guide cylinder can be applicable to drill pipes or advance small catheters of different specifications and diameters, further improving the accuracy of the installation angle of the advance small catheter, better playing the advance support role, improving the quality of tunnel construction. By providing several balls on the positioning plate and the inner side wall of the guide cylinder, the drill pipe and the advance small catheter can be protected during insertion, effectively reducing the degree of wear and tear and improving the service life.

[0019] 5. The utility model discloses a clamping piece, which can fix the advance small catheter, thereby facilitating subsequent grouting construction. The rotating clamping screw can adjust the clamping force of the arc-shaped clamping plate on the advance small catheter, ensuring that the small catheter does not move or tilt during grouting, thereby ensuring the accuracy and effect of grouting. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained without creative labor on the premise of the drawings.

[0021] Figure 1 It is a structural schematic view of a kind of tunnel advance support small catheter auxiliary installation device;

[0022] Figure 2 It is a mobile seat split structural schematic view of a kind of tunnel advance support small catheter auxiliary installation device;

[0023] Figure 3 It is a fixed piece sectional view of a kind of tunnel advance support small catheter auxiliary installation device;

[0024] Reference signs: 1-guide cylinder, 2-fixed piece, 3-rotation shaft, 4-mobile seat, 5-adjusting piece, 6-upper roller, 7-lower roller, 8-upper support, 9-lower support, 10-upper vertical plate, 11-upper horizontal plate, 12-lower vertical plate, 13-lower horizontal plate, 14-adjusting screw rod, 15-hinge seat, 16-mounting head, 17-adjusting screw rod, 18- telescopic rod, 19-connection cylinder, 20-upper fixed rod, 21-lower fixed rod, 22-rotation sleeve, 23-threaded rotating sleeve, 24-flexible rubber pad, 25-positioning plate, 26-positioning screw rod, 27-positioning guide rod, 28-rolling ball, 29-clamping screw rod, 30-arc-shaped clamping plate, 31-clamping guide rod. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the utility model, it needs to be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and it does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0028] In addition, if the terms "first", "second", "third" and the like are used only for differentiation, they cannot be understood as indicating or implying relative importance.

[0029] In addition, if the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0030] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "setting", "mounting", "connection", "connection" and the like are broadly understood, for example, they can be fixedly connected, or they can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] It needs to be explained that the features in the embodiments of the utility model can be combined with each other without conflict.

[0032] As shown in Figure 1 A kind of tunnel advance support small catheter auxiliary installation device, including two ends opening, inside hollow guide cylinder 1, two groups of fixed parts 2 are respectively set in the front end of the guide cylinder 1 two sides, and length is adjustable, fixedly set in the front end of the guide cylinder 1 two sides, and respectively with the fixed part 2 rotationally connected pivot 3, mobile seat 4 in the front end lower part of the guide cylinder 1, and adjustment piece 5 between the mobile seat 4 and guide cylinder 1, drive the guide cylinder 1 rotation is arranged.

[0033] It needs to be explained that: the auxiliary installation device of the application needs to be installed on tunnel H steel arch and used, and the web of H steel arch is pre-punched with through hole for drill rod and advance small catheter to pass through, the inside passage of the guide cylinder 1 should correspond to the through hole, and the size and material of the guide cylinder 1 can be formulated according to actual conditions;

[0034] In use, the mobile seat 4 is first slidably installed on the lower flange of the tunnel I-beam arch, then the length of the fixing member 2 is adjusted according to the spacing between the upper and lower flanges of the I-beam arch, so that the upper and lower ends of the fixing member 2 abut against the upper and lower flanges of the I-beam, respectively, thereby stably installing the device on the tunnel I-beam arch. Then the guide cylinder 1 is driven to rotate by the adjusting member 5, thereby adjusting the inclination angle of the guide cylinder 1, providing a stable and precise guide channel for the penetration of the drill rod and the small pilot pipe, ensuring that the drill rod and the small pilot pipe can penetrate into the predetermined position with the preset angle accuracy, effectively reducing the installation angle deviation caused by human factors and complex rock conditions, effectively ensuring the accuracy of the installation angle of the small pilot pipe, fully playing the role of the small pilot pipe, thereby improving the reinforcement effect on the surrounding rock and improving the quality and safety of the tunnel construction.

[0035] As shown in Figure 2 The mobile seat 4 comprises: upper and lower symmetrical upper rollers 6 and lower rollers 7, upper and lower supports 8 and 9 for mounting the upper rollers 6 and lower rollers 7, respectively, and an adjusting member connected between the upper and lower supports 8 and 9 for adjusting the spacing between the upper rollers 6 and the lower rollers 7.

[0036] The upper and lower supports 8 and 9 are both L-shaped, the upper support 8 comprises an upper vertical plate 10 and an upper horizontal plate 11 connected to the lower end of the upper vertical plate 10, and the upper roller 6 is rotatably connected to the outer upper end of the upper vertical plate 10. The lower support 9 comprises a lower vertical plate 12 slidably connected to the outer side of the upper vertical plate 10, and a lower horizontal plate 13 connected to the lower end of the lower vertical plate 12, and the roller is rotatably connected to the outer upper end of the lower vertical plate 12. The adjusting member is an adjusting screw 14 having one end rotatably connected to the upper horizontal plate 11 and the other end threaded through the lower horizontal plate 13.

[0037] The mobile seat 4 contacts the I-beam lower flange through the upper and lower symmetrical upper rollers 6 and lower rollers 7, so that when the device needs to move on the I-beam lower flange during tunnel construction, the rollers can reduce friction by rolling, making movement smoother. The upper rollers 6 and lower rollers 7 are mounted on the upper and lower supports 8 and 9, respectively, and the inner side of the lower vertical plate 12 is slidably connected to the outer side of the upper vertical plate 10, so that the lower support 9 can slide on the upper support 8 by rotating the adjusting screw 14, thereby changing the spacing between the upper rollers 6 and the lower rollers 7, so that the upper rollers 6 and the lower rollers 7 can better closely fit the two sides of the I-beam lower flange. Not only can it adapt to I-beam lower flanges of different thicknesses, but also can ensure the stability of the device in both moving and stationary states, which is conducive to assisting the installation of the device to work reliably on the I-beam arch, and also facilitates the installation and disassembly of the device.

[0038] As shown in Figure 1As shown, the adjusting member 5 comprises: a hinge seat 15 fixedly arranged on the outer wall of the lower end of the guide cylinder 1, a mounting head 16 hingedly connected with the hinge seat 15, an adjusting screw rod 17 hingedly connected at one end with the mounting head 16 and threadedly connected at the other end with the upper horizontal plate 11, and an extension rod 18 connected at one end with the outer wall of the lower end of the guide cylinder 1 and fixedly connected at the other end with the upper end surface of the upper horizontal plate 11.

[0039] When it is necessary to adjust the inclination angle of the guide cylinder 1, the adjusting screw rod 17 is rotated, and due to the threaded connection between the screw rod and the upper horizontal plate 11 and the limiting action of the extension rod 18, the mounting head 16 will be displaced relative to the upper horizontal plate 11, thereby driving the rotation of the guide cylinder 1 about the rotation shaft 3. During use, the rotation angle and the number of turns of the adjusting screw rod 17 can be accurately controlled by the construction personnel, so as to accurately adjust the rotation angle of the guide cylinder 1. Moreover, a scale can be arranged on the extension rod 18, so as to more accurately grasp the inclination angle of the guide cylinder 1. The structure is simple, and the operation is convenient.

[0040] As shown in Figure 3 the fixing member 2 comprises: a connecting cylinder 19, an upper fixing rod 20 slidably connected in the connecting cylinder 19, a lower fixing rod 21 slidably connected in the connecting cylinder 19, a rotating sleeve 22 arranged on the upper and lower ends of the connecting cylinder 19, respectively, and a threaded rotating sleeve 23 fixedly connected with the rotating sleeve 22 and threadedly connected with the upper fixing rod 20 and the lower fixing rod 21, respectively.

[0041] The upper end of the upper fixing rod 20 and the lower end of the lower fixing rod 21 are both provided with flexible rubber pads 24.

[0042] Since the upper fixing rod 20 and the lower fixing rod 21 are both slidably connected in the connecting cylinder 19, and the threaded rotating sleeve 23 is threadedly connected with the upper fixing rod 20 and the lower fixing rod 21, when the threaded rotating sleeve 23 fixedly connected with the rotating sleeve 22 is rotated, the upper fixing rod 20 and the lower fixing rod 21 will slide relative to each other in the connecting cylinder 19, so as to extend or retract the upper fixing rod 20 and the lower fixing rod 21 from the connecting cylinder 19, thereby adjusting the height of the entire fixing member 2. The fixing member 2 can be firmly abutted against the upper and lower flange plates of the H-shaped steel at different intervals, thereby improving the applicability of the device in the installation of different specifications of H-shaped steel arches. At the same time, the position of the guide cylinder 1 can also be adjusted, so that the front end of the guide cylinder 1 corresponds to the through hole of the web plate of the H-shaped steel.

[0043] The flexible rubber pads 24 arranged at the upper end of the upper fixing rod 20 and the lower end of the lower fixing rod 21 can buffer the pressure on the flange plate during the drilling and leading of the drill rod and the small guide pipe, and can also make the fixing rod better adhere to the flange plate of the H-shaped steel, thereby improving the friction between the fixing rod and the flange plate and enhancing the stability of the device in the installation of the H-shaped steel arch.

[0044] As Figure 1 shown, further comprising a positioning member arranged in the guide cylinder 1, the positioning member comprising: a positioning plate 25 arranged in the guide cylinder 1, a positioning screw 26 threaded through the top of the guide cylinder 1 and rotationally connected with the positioning plate 25, a positioning guide rod 27 movably penetrating the top of the guide cylinder 1 and fixedly connected with the positioning plate 25, and a plurality of rolling balls 28 arranged on the lower end surface of the positioning plate and the inner side wall bottom of the guide cylinder 1.

[0045] The positioning member is arranged to further improve the accuracy and versatility of the device. When the drill rod or the leading small catheter is inserted into the guide cylinder 1, the positioning screw 26 is rotated, and under the limiting action of the positioning guide rod 27, the positioning plate 25 can stably move up and down in the guide cylinder 1, so that the distance between the lower end of the positioning plate 25 and the inner side wall of the guide cylinder 1 is adapted to the diameter of the drill rod or the leading small catheter, further improving the accuracy of the installation angle of the leading small catheter, which is conducive to better playing the role of advanced support and improving the tunnel construction quality. At the same time, the positioning plate 25 and the plurality of rolling balls 28 on the inner side wall bottom of the guide cylinder 1 are in contact with the drill rod and the leading small catheter, which not only makes the drill rod and the leading small catheter more smooth during insertion, but also protects the drill rod and the leading small catheter, effectively reduces the wear degree, and improves the service life.

[0046] As Figure 1 shown, in order to facilitate subsequent grouting construction, further comprising clamping members arranged on both sides of the guide cylinder 1, respectively, the clamping member comprising: clamping screw rods 29 threaded through the side walls of the guide cylinder 1 on both sides, respectively, arc-shaped clamping plates 30 located in the guide cylinder 1 and rotationally connected with the end portions of the two clamping screw rods 29, respectively, clamping guide rods 31 movably penetrating the side walls of the guide cylinder 1 and fixedly connected with the clamping plates, and flexible rubber pads 24 arranged on the opposite side surfaces of the two arc-shaped clamping plates 30, respectively.

[0047] The clamping member is threaded through the side wall of the guide cylinder 1 by the clamping screw rod 29. When the clamping screw rod 29 is rotated, under the limiting action of the clamping guide rod 31, the clamping screw rod 29 will push the arc-shaped clamping plate 30 to stably move in the horizontal direction inside the guide cylinder 1. After the flexible rubber pads 24 on the opposite side surfaces of the two arc-shaped clamping plates 30 come into contact with the small catheter, they can tightly fit the outer surface of the small catheter, and the small catheter is firmly fixed in the guide cylinder 1 by friction force, thereby preventing the small catheter from shaking or deviating during grouting. The flexible rubber pads 24 can protect the surface of the small catheter during clamping, avoid surface damage caused by excessive clamping force, and ensure the integrity and service life of the small catheter.

[0048] Finally, it is explained that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described by referring to the preferred embodiments of the present application, it should be understood by those skilled in the art that various changes can be made in form and details without departing from the spirit and scope of the present application as defined by the appended claims.

Claims

1. A device for assisting installation of a small diameter pipe for tunnel advance support, characterized in that: The utility model provides a kind of adjustable guiding barrel, including two ends open, inside hollow guiding barrel (1), respectively be arranged in the both sides of the front end of the guiding barrel (1), and two groups of fixed parts (2) with adjustable length, fixedly arranged in the both sides of the front end of the guiding barrel (1), and the rotating shaft (3) is rotatably connected with the fixed part (2) respectively, mobile seat (4) is located in the lower part of the front end of the guiding barrel (1), and adjusting part (5) is arranged between the mobile seat (4) and guiding barrel (1), drives the rotation of the guiding barrel (1).

2. The device according to claim 1, characterized in that: The mobile seat (4) includes: upper and lower symmetrically arranged upper roller (6) and lower roller (7), upper support (8) and lower support (9) are respectively installed on the upper roller (6) and lower roller (7), and adjusting part is connected between the upper support (8) and lower support (9), for adjusting the distance between the upper roller (6) and lower roller (7).

3. The device according to claim 2, characterized in that: The upper support (8) and lower support (9) are both L-shaped, the upper support (8) includes upper vertical plate (10) and upper horizontal plate (11) connected to the lower end of the upper vertical plate (10), the upper roller (6) is rotatably connected to the outer side of the upper end of the upper vertical plate (10), the lower support (9) includes: lower vertical plate (12) slidably connected to the outer side of the upper vertical plate (10), and lower horizontal plate (13) connected to the lower end of the lower vertical plate (12), the roller is rotatably connected to the outer side of the upper end of the lower vertical plate (12), and the adjusting part is adjusting screw (14) with one end rotatably connected to the upper horizontal plate (11) and the other end threaded through the lower horizontal plate (13).

4. The device according to claim 3, characterized in that: The adjusting part (5) includes: hinged seat (15) fixedly arranged on the outer side wall of the lower end of the guiding barrel (1), mounting head (16) hinged to the hinged seat (15), adjusting screw (17) with one end rotatably connected to the mounting head (16) and the other end threaded through the upper horizontal plate (11), and telescopic rod (18) with one end connected to the outer side wall of the lower end of the guiding barrel (1) and the other end fixedly connected to the upper end surface of the upper horizontal plate (11).

5. The device according to claim 1, characterized in that: The fixed part (2) includes: connecting cylinder (19), upper fixed rod (20) slidably connected in the connecting cylinder (19), lower fixed rod (21) slidably connected in the connecting cylinder (19), rotating sleeve (22) arranged on the upper and lower ends of the connecting cylinder (19), and threaded rotating sleeve (23) fixedly connected with the rotating sleeve (22) and threadedly connected with the upper fixed rod (20) and lower fixed rod (21) respectively.

6. A device for assisting installation of a small diameter pipe in a tunnel according to claim 5, characterized in that: The upper end of the upper fixed rod (20) and the lower end of the lower fixed rod (21) are both provided with flexible rubber pad (24).

7. The device according to claim 1, characterized in that: It also includes a positioning member arranged in the guide cylinder (1), which comprises a positioning plate (25) arranged in the guide cylinder (1), a positioning screw (26) threadedly penetrating the top of the guide cylinder (1) and rotationally connected with the positioning plate (25), a positioning guide rod (27) movably penetrating the top of the guide cylinder (1) and fixedly connected with the positioning plate (25), and a plurality of rolling balls (28) arranged on the lower end surface of the positioning plate (25) and the inner side wall bottom of the guide cylinder (1).

8. The device according to claim 1, characterized in that: It also includes clamping members arranged on both sides of the guide cylinder (1) respectively, which comprises clamping screws (29) threadedly penetrating the side walls on both sides of the guide cylinder (1) respectively, arc-shaped clamping plates (30) arranged in the guide cylinder (1) and rotationally connected with the end portions of the two clamping screws (29) respectively, clamping guide rods (31) movably penetrating the side walls of the guide cylinder (1) and fixedly connected with the clamping plates, and flexible rubber pads (24) arranged on the opposite side surfaces of the two arc-shaped clamping plates (30) respectively.

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