Auxiliary device for tunnel excavation peripheral blast hole lofting

Abstract

The utility model relates to an auxiliary device for tunnel excavation peripheral blast hole lofting, which comprises a telescopic rod, a clamping piece and an expansion fixing screw rod, the clamping piece is arranged on the telescopic rod, the expansion fixing screw rod is fixedly connected in a fixing hole of the clamping piece, the telescopic rod comprises a first telescopic rod and a second telescopic rod which are telescopic and provided with scales, and the first telescopic rod and the second telescopic rod are fixedly connected with the clamping piece. The clamping piece comprises an end clamping piece and a middle movable clamping piece which are identical in structure, the expandable fixing screw comprises a sleeve and a threaded core rod, a positioning protrusion and a counter-force seat are sequentially arranged at one end of the sleeve, a plurality of elastic expansion pieces are evenly distributed at the other end of the sleeve, the threaded core rod is arranged in the sleeve and extends out of the two ends of the sleeve, and one end of the threaded core rod is of a trumpet-shaped structure. One end of the expansion fixing screw rod is arranged in the blast hole through the elastic expansion piece, and the other end of the expansion fixing screw rod is arranged in the fixing hole of the clamping piece through the threaded core rod. The device is beneficial to precise and rapid lofting of the blast hole, the precision and the construction effect are improved, and the device is convenient to mount and dismount, good in stability and high in adjustability.

Description

Technical Field

[0001] The utility model relates to an auxiliary device for setting out blastholes around a traffic tunnel constructed by a drilling and blasting method, in particular to an auxiliary device for setting out blastholes around tunnel excavation, belonging to the technical field of tunnel blasthole setting out devices. Background Art

[0002] At present, the drilling and blasting method is mostly used in mountain tunnel excavation in my country. In order to ensure the stability of the surrounding rock of the rough excavation, minimize over-excavation and under-excavation, and achieve the low-carbon and economic goals of tunnel engineering, smooth controlled blasting is the preferred method for tunnel excavation, and the layout and layout of surrounding blastholes are crucial.

[0003] When staking out the peripheral blastholes in traditional tunnels, there are a large number of peripheral blastholes on the face in each cycle. Workers use total stations to only stake out a few key points on the face excavation contour line, and the positioning of other peripheral blastholes is determined by the workers' feelings. This results in a large degree of randomness in the stakeout points, serious over-excavation and under-excavation problems, and poor light blasting effects.

[0004] At present, the patent CN206942670U is a rapid positioning mold for the peripheral eye of large-section tunnel excavation. Three unit molds are set in sections, and the three unit molds are assembled and connected in sequence to form a semi-arch mold. Two groups of semi-arch molds are assembled at the top to form an arch crown. The bottom ends of the two groups of semi-arch molds are respectively supported at the arch feet on both sides. Through eye holes are set at set intervals on the three unit molds to form a peripheral eye arch mold. The mold can be quickly and accurately positioned to improve construction efficiency and ensure project quality. The mold is implanted with φ18 steel bars at the positioning points to fix the three unit molds. The steel bars are not further tightened, and the mold may fall off the steel bars, resulting in unstable operation. In addition, the eye holes on the mold are fixed and can only adapt to the requirements of one size of blastholes. The adaptability is poor, and the curvature of the mold cannot be adjusted according to actual conditions, and the flexibility is poor.

[0005] Based on the above problems, surveyors at the construction site use total stations and necessary auxiliary devices to accurately and quickly lay out the peripheral blast holes on the face. To this end, an auxiliary device for laying out peripheral blast holes in tunnel excavation that can overcome the above defects has been developed, which has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide an auxiliary device for staking out blastholes around tunnel excavation, which is conducive to accurate and rapid staking out of blastholes, improves accuracy and construction effect, is easy to install and disassemble, has good stability and high adjustability.

[0007] In order to solve the above technical problems, the utility model provides an auxiliary device for blasthole setting out around tunnel excavation, comprising a telescopic rod, a clamp and an expandable and contractible fixing screw. The telescopic rod is provided with three clamps, and the fixing hole of each clamp is fixedly connected with an expandable and contractible fixing screw, wherein:

[0008] The telescopic rod comprises a first telescopic rod and a second telescopic rod with scales, the first telescopic rod is movably sleeved on one end of the second telescopic rod, and the second telescopic rod is telescopic in the first telescopic rod;

[0009] The clamps include an end clamp and an intermediate movable clamp of the same structure. The end clamps are fixedly provided at both ends of the telescopic rod, and a movable intermediate movable clamp is provided between the end clamps on the telescopic rod.

[0010] The expandable fixing screw includes a sleeve and a threaded core rod. One end of the sleeve is provided with a positioning protrusion and a reaction seat in sequence, and the other end is evenly distributed with several elastic expansion plates. The outer surface of each elastic expansion plate is provided with multiple slots in parallel. The threaded core rod is arranged in the sleeve and extends out of the two ends of the sleeve. The end of the threaded core rod extending out of the elastic expansion plate on the sleeve is a trumpet-shaped structure. The surface of the end of the threaded core rod extending out of the reaction seat on the sleeve is provided with two threads at intervals. Nuts and nuts are correspondingly provided on the threads. The nut is arranged in contact with the reaction seat. One end of the expandable fixing screw is arranged in the blast hole through the elastic expansion plate, and the other end is arranged in the fixing hole of the clamp through the threaded core rod and fastened by the nut.

[0011] The technical solution further defined in the utility model is:

[0012] Furthermore, in the aforementioned auxiliary device for staking out blast holes around tunnel excavation, a fastener is provided on the first telescopic rod, and the first telescopic rod and the second telescopic rod are connected and fixed by the fastener. The fastener includes a threaded blade and a threaded lock. One end of the first telescopic rod is provided with an end clamp, and the other end extends outward to form a plurality of threaded blades. The threaded blades are sleeved on the second telescopic rod, and the outer sleeve of the threaded blades is provided with a matching threaded lock for tightening and loosening.

[0013] Technical effect: The two telescopic rods of the utility model are fastened and loosened by fasteners, and can be extended and retracted according to the requirements. Then, the threaded blades are screwed on the telescopic rods by thread lock buckles to lock the telescopic rods. The adjustment adaptability is strong and can meet the needs of different sizes.

[0014] The fastener uses threaded blades and threaded locks to cooperate, which is easy to install and disassemble, and the threaded blades have a certain elasticity, which makes it easy for the second telescopic rod to extend and retract inside the first telescopic rod. When fastening, it is also easy to press the threaded blades against the second telescopic rod for fixed connection.

[0015] In the aforementioned auxiliary device for blasthole setting out around tunnel excavation, four threaded blades are evenly spaced along the circumferential direction of the first telescopic rod, and the outer surface of the threaded blade is provided with an external thread;

[0016] The thread lock buckle is a tubular structure, with an internal thread inside the thread lock buckle, and a plurality of waist-shaped grooves are evenly distributed on the outer surface of the thread lock buckle;

[0017] The thread lock thread is arranged on the thread blade to press the thread blade toward the outer wall of the second telescopic rod, thereby fastening the first telescopic rod to the second telescopic rod.

[0018] Technical effect: the utility model has four threaded blades, which are arranged at intervals and have a certain elasticity, so that the second telescopic rod can be extended and retracted in the first telescopic rod, and a waist-shaped groove is provided on the threaded lock buckle, which is convenient for manually tightening the threaded lock buckle.

[0019] In the aforementioned auxiliary device for staking out blastholes around tunnel excavation, the threaded lock is a hollow truncated cone structure with openings at both ends, and the surface of the threaded lock is inclined. The threaded lock presses the threaded blades to connect and fix the first telescopic rod and the second telescopic rod.

[0020] Technical effect: the threaded lock buckle of the utility model adopts a truncated cone structure, and the opening at one end is slightly smaller than the opening at the other end, ensuring that the first telescopic rod is pressed toward the second telescopic rod for better connection and fixation.

[0021] In the aforementioned auxiliary device for staking out blastholes around tunnel excavation, elastic rubber gaskets are respectively provided on the inner surface of the threaded blade, between the clamp and the telescopic rod.

[0022] Technical effect: The utility model adopts an elastic rubber gasket, which has compressible high resilience between the threaded blade and the second telescopic rod, and between the clamp and the telescopic rod to reduce component wear and increase frictional resistance, thereby increasing the clamping force, improving stability and extending service life.

[0023] In the aforementioned auxiliary device for staking out blastholes around tunnel excavation, the end clamp includes two semicircular cards, one end of the two cards are connected by a hinge axis, and the other ends extend outward to form a fixing plate, the fixing plate is provided with a circular hole, and an expandable fixing screw is installed in the circular hole. There is also a screw hole on the card, and a screw is provided in the screw hole to press against the telescopic rod to tighten the end clamp and the telescopic rod.

[0024] Technical effect: the clamp of the utility model is an openable and closable hinge structure, the clamp can rotate freely around the hinge axis (latch shaft) to open and close, easy to install and disassemble, and the expandable and contractible fixing screw is well fixedly connected to the telescopic rod, with high stability. Clamps are fixed at both ends of the telescopic rod, and a movable clamp is also provided in the middle. First, two points are fixed, and then the middle movable clamp is adjusted according to the required curvature. The elastic telescopic rod is bent to the required curvature by determining an arc line through three fixed points, and is hung at the corresponding position of the palm face contour line to form a ruler, which is convenient for accurate layout of blastholes.

[0025] In the aforementioned auxiliary device for staking out blastholes around tunnel excavation, the diameter of the large opening at one end of the horn-shaped threaded core rod is larger than the outer diameter of the casing.

[0026] Technical effect: The diameter of the trumpet-shaped large mouth of the utility model is larger than the outer diameter of the casing, ensuring that after the fixing screw is put into the blast hole, the threaded core rod is pulled, and the trumpet shape pushes the elastic expansion plate outward to strengthen the fixation in the blast hole and improve stability. If it is too small, the elastic expansion plate cannot be pushed up and the fixing effect cannot be achieved.

[0027] In the aforementioned auxiliary device for setting out peripheral blastholes in tunnel excavation, the outer diameter of the positioning protrusion is the same as the inner diameter of the peripheral fixed blastholes on the tunnel face.

[0028] Technical effect: the outer diameter of the positioning protrusion of the utility model is the same as the inner diameter of the fixed blast hole on the palm face, ensuring that the expandable and contractible fixing screw is centered in the fixing hole.

[0029] In the aforementioned auxiliary device for staking out blastholes around tunnel excavation, the auxiliary device is made of high molecular polyethylene material.

[0030] Technical effect: The utility model is made of polyethylene material, which has excellent low-temperature resistance, good chemical stability, resistance to corrosion by most acids and alkalis, excellent electrical insulation, high elasticity, easy to use, extended service life and reduced costs.

[0031] The beneficial effects of the utility model are:

[0032] The utility model is provided with a first telescopic rod and a second telescopic rod, which are connected by fasteners. The length can be extended and retracted as required to meet work needs. The utility model has strong applicability. Scales are set on the telescopic rod, which is convenient for calibrating the spacing when blastholes are laid out, and is convenient for rapid laying out, improving accuracy, realizing auxiliary laying out, and reducing the problem of over-digging and under-digging.

[0033] The utility model is provided with three clamping pieces, the clamping pieces at both ends are used for fixing, and the intermediate movable clamping piece in the middle is adjusted according to the required arc, and the adjustability is high.

[0034] The utility model does not fix the telescopic rod by the action of a pin shaft or a steel bar, but uses an expandable fixing screw to fix the telescopic rod in the blast hole. An elastic expansion piece is provided on one side of the casing to facilitate the outward lifting and fixing in the blast hole. A card slot is provided outside the elastic expansion piece to increase the friction resistance with the hole wall and improve stability. A positioning convex and a reaction seat are provided on the other side of the casing. The outer diameter of the positioning convex is the same as the inner diameter of the fixing hole on the palm face, so as to ensure that the expandable fixing screw is centered in the fixing hole. The reaction seat is used when the expandable fixing screw is tightened and recovered. , providing reaction force to the threaded core rod, making it convenient to tighten or retract the core rod. A nut is provided on one side of the reaction seat to ensure that the threaded core rod will not be squeezed and compressed back into the casing. The left end of the threaded core rod is a reducing cylinder, that is, one end is horn-shaped, and the leftmost end has the largest diameter. Two threads are provided on the end of the threaded core rod extending out of the reaction seat for adding nuts and nuts. One end of the casing is fixed in the borehole by pulling the threaded core rod, with good stability, and the other end is fixed in the fixing hole of the clamp through the nut, which is easy to install and disassemble, has good firmness, and is not easy to fall off.

[0035] The utility model ingeniously utilizes the principle of three-point determination of circular arc to realize rapid positioning of different arc segments of excavation contour line and accurate and rapid layout of peripheral holes of face excavation, thus improving accuracy and construction efficiency; the material used in the device is lightweight and highly elastic, has strong deformation recovery ability and can be reused many times, thus reducing the labor intensity of workers in layout; the point hole and the peripheral blast hole are combined into one, thus achieving the goal of multiple uses of one hole and saving cost and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of the assembled telescopic rod and the clamping member in the auxiliary device for staking out blast holes around tunnel excavation according to an embodiment of the utility model;

[0037] Figure 2 This is a schematic structural diagram of the telescopic rod in the auxiliary device for setting out blast holes around tunnel excavation according to an embodiment of the utility model when adjusting the telescopic rod;

[0038] Figure 3 for Figure 2 Schematic diagram of the structure when it is bent;

[0039] Figure 4 for Figure 1 Schematic diagram of the structure of the middle thread lock;

[0040] Figure 5 This is a schematic diagram of the structure of a rubber gasket in an auxiliary device for setting out blastholes around tunnel excavation according to an embodiment of the utility model;

[0041] Figure 6 for Figure 2 Schematic diagram of the structure of the medium thread blade;

[0042] Figure 7 for Figure 1Schematic diagram of the structure when the middle end card is opened;

[0043] Figure 8 for Figure 1 Schematic diagram of the structure when the middle end clamp is closed;

[0044] Fig. 9 This is a schematic diagram of the structure of an expandable and contractible fixed screw in an auxiliary device for setting out blastholes around tunnel excavation according to an embodiment of the utility model;

[0045] Fig.10 for Fig. 9 Schematic diagram of the operation when the middle threaded core rod is pulled outwards to be tightened in the blast hole;

[0046] Fig.11 for Fig.10 The structural diagram of the nut;

[0047] Fig.12 for Fig.10 Side view of

[0048] Fig.13 for Fig.10 Schematic diagram of the structure of the middle nut;

[0049] Fig.14 for Fig.13 Side view of

[0050] In the figure: 1-telescopic rod, 101-first telescopic rod, 102-second telescopic rod, 2-card, 201-end card, 2011-card, 2012-hinge shaft, 2013-fixed plate, 2014-round hole, 2015-screw hole, 202-middle moving card, 3-sleeve, 4-threaded core rod, 5-reaction seat, 6-elastic expansion sheet, 7-card slot, 8-nut, 9-nut, 10-threaded blade, 11-threaded lock buckle, 111-waist-shaped groove, 12-elastic rubber gasket, 13-positioning convex. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them; the technical features involved in the various implementation methods of the utility model described below can be combined with each other as long as they do not conflict with each other. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0052] This embodiment provides an auxiliary device for blasthole setting out around tunnel excavation, the structure of which is as follows: Figure 1As shown, it includes a telescopic rod 1, a clamp 2 and an expandable fixing screw. The telescopic rod 1 is provided with three clamps 2, and an expandable fixing screw is fixedly connected in a fixing hole of each clamp 2, wherein:

[0053] Structure Figure 2-6 As shown, the telescopic rod 1 includes a first telescopic rod 101 and a second telescopic rod 102 with scales. The outer diameter of the second telescopic rod 102 is slightly smaller than the inner diameter of the first telescopic rod 101, ensuring that the first telescopic rod 101 is effectively fastened to the second telescopic rod 102 when the threaded lock is tightened. The first telescopic rod 101 is movably sleeved on one end of the second telescopic rod 102 through a fastener, and the second telescopic rod 102 is telescopic in the first telescopic rod 101. When fixed, the scales on the first telescopic rod and the second telescopic rod are continuously connected to form a complete ruler, which is convenient for calibrating the hole distance. The fastener includes a threaded blade 10 and a threaded lock 11. One end of the first telescopic rod 101 is provided with an end clamp 2 01, the other end extends outward to form four threaded blades 10, and the threaded blades 10 are evenly spaced along the circumferential direction of the first telescopic rod 101. The outer surface of the threaded blade 10 is provided with an external thread, and the threaded blade 10 is sleeved on the second telescopic rod 102. The threaded lock buckle 11 is a tubular structure or a truncated cone structure with openings at both ends and a groove in the middle. According to the requirements, the threaded lock buckle 11 is provided with an internal thread, and the outer surface of the threaded lock buckle 11 is evenly distributed with a number of waist-shaped grooves 111. The threaded lock buckle 11 is threadedly arranged on the threaded blade 10 to press the threaded blade 10 against the outer wall of the second telescopic rod 102, and the first telescopic rod 101 is fastened to the second telescopic rod 102, and vice versa. Loosen;

[0054] Specifically, the surface of the truncated cone structure threaded lock buckle 11 is inclined, and the opening size of the threaded lock buckle 11 at one end of the first telescopic rod 101 is larger than the opening size at one end of the second telescopic rod 101. The inclination is determined according to the size of the first telescopic rod and the second telescopic rod. The threaded lock buckle 11 presses the threaded blade 10 and connects and fixes the first telescopic rod 101 and the second telescopic rod 102.

[0055] Structure Figure 7-8As shown, the clamp 2 includes an end clamp 201 and an intermediate movable clamp 202 with the same structure. The size of the first telescopic rod 101 is slightly different from that of the second telescopic rod 102. The end clamp 201 is set according to the size of the corresponding telescopic rod. The inner diameter of the two semicircular cards in the end clamp is consistent with the outer diameter of the corresponding telescopic rod, which is convenient for fastening. The two ends of the telescopic rod 1 are respectively fixed with the end clamp 201, and the first telescopic rod 101 is provided with a movable intermediate movable clamp 202. The end clamp 201 is fixed with the end clamp 201. 201 is an opening and closing structure, comprising two semicircular cards 2011, one end of the two cards 2011 is connected by a hinge shaft 2012, and the other end extends outward to form a fixing plate 2013, the fixing plate 2013 is provided with a round hole 2014, the round hole 2014 is provided with an expandable fixing screw, the card 2011 is also provided with a screw hole 2015, the screw hole 2015 is provided with a screw, the screw passes through the screw hole and abuts against the outer wall of the telescopic rod 1 to tighten the end clamp 201 and the telescopic rod 1;

[0056] Structure Figure 9-14 As shown, the expandable fixing screw comprises a casing 3 and a threaded core rod 4. One end of the casing 3 is provided with a positioning protrusion 13 and a reaction seat 5 in sequence. The outer diameter of the positioning protrusion 13 is the same as the inner diameter of the peripheral fixed blasthole on the face, so as to ensure that the expandable fixing screw is centered in the fixed hole. Four elastic expansion pieces 6 are evenly distributed on the other end. The outer surface of each elastic expansion piece 6 is provided with a plurality of slots 7 in parallel. The threaded core rod 4 is arranged in the casing 3 and extends out of both ends of the casing 3. One end of the threaded core rod 4 extending out of the elastic expansion piece 6 on the casing 3 is a trumpet-shaped structure. The diameter of the large end of the trumpet-shaped structure is larger than that of the casing The outer diameter of the tube 3 ensures that when the threaded core rod is pulled, the trumpet-shaped structure pushes the casing outward for easy fixation in the blast hole. The surface of one end of the threaded core rod 4 extending out of the reaction seat 5 on the casing 3 is provided with two threads at intervals, and a nut 8 and a nut 9 are provided on the thread accordingly. The nut 8 is arranged in contact with the reaction seat 5. One end of the expandable and contractible fixing screw is arranged in the blast hole through an elastic expansion sheet 6, and the other end is arranged in the fixing hole of the clamp 2 through the threaded core rod 4 and is tightened by the nut 9. One end of the nut is closed and does not penetrate the threaded core rod 4. The nut cover is on the threaded core rod for easy tightening and positioning.

[0057] In this embodiment, elastic rubber gaskets 12 are respectively provided on the inner surface of the threaded blade 10, between the clamp 2 and the telescopic rod 1. Figure 5 As shown, it reduces component wear and increases friction, thereby extending service life.

[0058] In this embodiment, the auxiliary device is made of high molecular polyethylene material, which has a certain elasticity for easy operation, chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high wear resistance processing performance, which extends its service life and reduces costs.

[0059] During the specific implementation, first use the total station to lay out three key points of a circular arc on the excavation contour line, and then use a drilling machine to drill blast holes (fixed holes) at the key points. When in use, first insert the expandable fixing screw into the fixing hole, press the reaction seat 5 close to the face, pull the threaded core rod 4 outward from the casing 3, and move the variable diameter cylindrical trumpet-shaped end of the threaded core rod 4 into the casing 3, so that the elastic expansion piece 6 on the casing 3 is stretched outward and stuck in the fixing hole, and the nut 8 is screwed into the corresponding position of the threaded core rod 4 to ensure that the threaded core rod 4 will not be squeezed and compressed back into the casing 3. At this time, the fixing screw is connected and fixed to the fixing hole, and then the circular hole 2014 on the openable and closable page of the clamp 2 can be sleeved on one side of the nut, and finally the nut is tightened to hang the clamp 2 on the fixing screw.

[0060] When recycling, first remove the nut 9 and the clamp 2, then remove the nut 8, press the reaction seat 5 to push the threaded core rod 4 back into the sleeve 3, and the elastic expansion piece 6 can automatically return to its position due to its own material properties when there is no external force. Then the expandable fixing screw can be completely taken out of the fixing hole for reuse.

[0061] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An auxiliary device for blasthole setting out around tunnel excavation, characterized in that: It comprises a telescopic rod (1), a clamp (2) and an expandable fixing screw, wherein the telescopic rod (1) is provided with three clamps (2), and the expandable fixing screw is fixedly connected in a fixing hole of each clamp (2), wherein: The telescopic rod (1) comprises a first telescopic rod (101) and a second telescopic rod (102) with scales, the first telescopic rod (101) being movably sleeved on one end of the second telescopic rod (102), and the second telescopic rod (102) being retractable within the first telescopic rod (101); The clamping member (2) comprises an end clamping member (201) and an intermediate movable clamping member (202) of the same structure. The end clamping members (201) are fixedly provided at both ends of the telescopic rod (1), and a movable intermediate movable clamping member (202) is provided on the telescopic rod (1) between the end clamping members (201); The expandable fixing screw comprises a sleeve (3) and a threaded core rod (4). One end of the sleeve (3) is provided with a positioning protrusion (13) and a reaction seat (5) in sequence, and the other end is evenly distributed with a plurality of elastic expansion sheets (6). The outer surface of each elastic expansion sheet (6) is provided with a plurality of slots (7) in parallel. The threaded core rod (4) is arranged in the sleeve (3) and extends out of both ends of the sleeve (3). The end of the threaded core rod (4) extending out of the elastic expansion sheet (6) on the sleeve (3) is a trumpet-shaped structure. The surface of the end of the threaded core rod (4) extending out of the reaction seat (5) on the sleeve (3) is provided with two threads at intervals. A nut (8) and a nut (9) are provided on the threaded core rod accordingly. The nut (8) is arranged in contact with the reaction seat (5). One end of the expandable fixing screw is arranged in the blast hole through the elastic expansion sheet (6), and the other end is arranged in the fixing hole of the clamp (2) through the threaded core rod (4) and is fastened by the nut (9).

2. The auxiliary device for blasthole setting out around tunnel excavation according to claim 1, characterized in that: A fastener is provided on the first telescopic rod (101), and the first telescopic rod (101) and the second telescopic rod (102) are connected and fixed by the fastener, and the fastener comprises a threaded blade (10) and a threaded lock buckle (11); one end of the first telescopic rod (101) is provided with the end clamp (201), and the other end extends outward to form a plurality of the threaded blades (10); the threaded blades (10) are sleeved on the second telescopic rod (102), and the threaded blades (10) are sleeved with matching threaded lock buckles (11) for tightening and loosening.

3. The auxiliary device for blasthole setting out around tunnel excavation according to claim 2, characterized in that: Four of the threaded blades (10) are evenly spaced along the circumferential direction of the first telescopic rod (101), and the outer surface of the threaded blade (10) is provided with an external thread; The thread lock buckle (11) is a tubular structure, an internal thread is provided in the thread lock buckle (11), and a plurality of waist-shaped grooves (111) are evenly distributed on the outer surface of the thread lock buckle (11); The threaded locking buckle (11) is threadably disposed on the threaded blade (10) to press the threaded blade (10) toward the outer wall of the second telescopic rod (102), thereby fastening the first telescopic rod (101) to the second telescopic rod (102).

4. The auxiliary device for blasthole setting out around tunnel excavation according to claim 2, characterized in that: The threaded locking buckle (11) is a truncated cone structure with openings at both ends and a groove in the middle. The surface of the threaded locking buckle (11) is inclined. The threaded locking buckle (11) presses the threaded blade (10) to connect and fix the first telescopic rod (101) and the second telescopic rod (102).

5. The auxiliary device for blasthole setting out around tunnel excavation according to claim 2, characterized in that: Elastic rubber gaskets (12) are respectively provided on the inner surface of the threaded blade (10), between the clamp (2) and the telescopic rod (1).

6. The auxiliary device for blasthole setting out around tunnel excavation according to claim 1, characterized in that: The end clamp (201) comprises two semicircular cards (2011), one end of the two cards (2011) being connected via a hinge shaft (212), and the other end of the two cards respectively extending outward to form a fixing plate (213), the fixing plate (2013) being provided with a circular hole (2014), the circular hole (2014) being provided with the expandable fixing screw, the card (2011) being further provided with a screw hole (215), the screw hole (2015) being provided with a screw which abuts against the telescopic rod (1) to screw the end clamp (201) and the telescopic rod (1) together.

7. The auxiliary device for blasthole setting out around tunnel excavation according to claim 1, characterized in that: The diameter of the large opening at one trumpet-shaped end of the threaded core rod (4) is larger than the outer diameter of the sleeve (3).

8. The auxiliary device for blasthole setting out around tunnel excavation according to claim 1, characterized in that: The outer diameter of the positioning protrusion (13) is the same as the inner diameter of the peripheral fixed blast holes on the tunnel face.

9. The auxiliary device for blasthole setting out around tunnel excavation according to claim 1, characterized in that: The auxiliary device is made of high molecular polyethylene material.

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