Rapid construction method for static excavation of hard rock tunnel

Abstract

The invention belongs to the technical field of tunnel excavation, and discloses a hard rock tunnel static excavation rapid construction method which comprises the following steps: S1, setting out a tunnel face design excavation contour line according to a control lead in a tunnel hole, and marking a drilling coring center position; s2, a water milling drill lifting transport vehicle is adopted to transport a water milling drill to the upper step of the tunnel face to be aligned with the drilling and coring center position for drilling and coring one by one; s3, the two splitting rods are arranged in the adjacent holes through a splitting rod mounting tool, then splitting is started, and the adjacent holes are repeatedly and circularly filled from top to bottom along the tunnel face for splitting till splitting of all the holes is completed; s4, the tunnel face is chiseled away through a breaking hammer; and S5, the lower step of the tunnel face is constructed according to the steps S2-S4, and inspection and acceptance are conducted. The method has the advantages that the construction efficiency is high, vibration generated by the whole process is small, the excavation construction speed is greatly increased, the tunnel over-excavation loss rate is reduced, and the cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel excavation, and in particular relates to a fast construction method for static excavation of a hard rock tunnel. Background Art

[0002] Since there is no special lifting and transportation tool for water-grinding drills and the conversion of the core hole position takes a long time, and the splitting rods can only be installed manually, there is a risk of rocks falling and damaging the machinery and personnel, water-grinding drills and splitting rods are rarely used in hard rock tunnel excavation. Traditional hydraulic breakers and cantilever tunnel boring machines are usually used for excavation construction. However, since the saturated compressive strength of hard rock is as high as 103.5Mpa~120Mpa, direct chiseling with a breaker has low construction efficiency, large vibration, which can easily affect the operating equipment of the operating line, and a high loss rate. Summary of the invention

[0003] The present invention aims to provide a rapid construction method for static excavation of hard rock tunnels with high construction efficiency and low safety risks, and to solve the problems of low construction efficiency, high vibration that easily affects operating equipment of operating lines, and high loss rate in the current excavation construction method using traditional hydraulic breakers and cantilever tunneling machines.

[0004] To this end, the technical solution adopted by the present invention is: a fast construction method for static excavation of a hard rock tunnel, comprising the following steps:

[0005] Step S1, setting out the excavation contour line of the face according to the control wire in the tunnel, and marking the center position of the core drilling;

[0006] Step S2, using a water-mill drill lifting and transporting vehicle to transport the water-mill drill to the step on the face, aligning it with the center position of the coring, and drilling and coring one by one, thereby leaving holes arranged along the intersection of the step contour lines on the face and holes evenly distributed in the middle;

[0007] Step S3, using a splitting rod installation tool to place two splitting rods in adjacent holes respectively, and then start splitting, and repeat the cycle from top to bottom along the tunnel face to fill the adjacent holes and split until all holes are split;

[0008] Step S4: Use a breaker hammer to chisel away the tunnel face from top to bottom along the tunnel face contour line, and then correct the coring corners of the water-mill drill at the design contour line until the excavation contour line meets the design requirements.

[0009] Step S5, construct the step below the face according to steps S2-S4, and inspect and accept after each cycle of excavation is completed.

[0010] As a preferred embodiment of the above scheme, in step S2, the holes on the face contour line intersect by 20mm to 22mm, so as to ensure the coring efficiency while controlling the over-excavation of the face. The holes in the middle of the face are arranged in an oblique array, and the distance between the outermost holes and the holes on the face contour line is 68cm to 70cm. The spacing between adjacent holes in a horizontal row is 1000mm to 1100mm, and the spacing between adjacent holes in a vertical row is 500mm to 520mm. The reasonable size can effectively ensure that the holes are evenly distributed on the face, effectively avoiding the long drilling and coring process time due to too dense holes, and the failure of the cracks caused by the later splitting rod to cover most of the face due to too sparse holes.

[0011] It is further preferred that in step S2, two water-mill drill lifting and transport vehicles and the corresponding water-mill drill rigs are symmetrically arranged on the left and right, and core drilling is performed on the left and right sides of the face respectively, effectively improving the efficiency of core drilling. The water-mill drill lifting and transport vehicles only need to be lifted and lowered and do not need to move horizontally left and right, which meets actual needs; and as the amount of drill cuttings accumulated in the drilling exceeds the standard, one water-mill drill lifting and transport vehicle withdraws to make room for a wheeled excavator to enter and remove the drill cuttings accumulated on the face. The steps are reasonable and effectively prevent the accumulation of drill cuttings from affecting subsequent construction.

[0012] Further preferably, the water-grinding drill lifting transport vehicle comprises a transport vehicle and a lifting platform located on the top surface of the transport vehicle, and the transport vehicle chassis is symmetrically provided with four ground-supporting screw rods, thereby increasing the stability of the transport vehicle when the water-grinding drill is drilling and coring, meeting the basic strength and stability requirements, and reducing the shaking during the water-grinding drill drilling and coring operation, thereby ensuring the construction safety and accuracy of the drilling and coring; the left and right lifting platforms are connected by a horizontal double-headed screw rod, and the outer side of the lifting platform is connected to the corresponding side wall by an oblique double-headed screw rod extending outward and upward, thereby enhancing the stability of the lifting platform;

[0013] The lifting platform includes a water-mill drilling rig placement platform and retractable supporting legs symmetrically arranged at the four corners of the bottom of the water-mill drilling rig placement platform. The retractable supporting legs include three sections of square cylinders that are sequentially mounted inside and outside and two hydraulic cylinders that respectively drive the middle section and the upper section of the square cylinder to lift and lower. The square cylinders are vertically spaced apart and have a row of mounting sockets, and the connections between adjacent sections of the square cylinders are equipped with pins that can pass through the corresponding mounting sockets inside and outside for fixed connection. The lower section of the square cylinder is fixed on the transport vehicle, and the top of the upper section of the square cylinder is fixedly connected to the lifting platform.

[0014] At present, when using a water-grinding drill for drilling, it is necessary to build a support covering the drilling area, and then manually hold the water-grinding drill to drill. According to the change of drilling height, the staff moves to the corresponding plank platform of the support to carry out drilling construction. If a water-grinding drilling rig is used, it is necessary to pile up soil to form a drilling rig placement platform, and continuously reduce or increase the height of the soil pile according to the change of drilling height. Both methods are time-consuming and labor-intensive, and are more cumbersome than directly using a breaker hammer to remove. Therefore, they are not suitable for the current tunnel excavation situation. The use of a water-grinding drill lifting and transport vehicle to provide a water-grinding drill lifting effect can greatly improve the drilling efficiency of the water-grinding drill. By lifting the lifting platform, drilling can be achieved at any position of the face, reducing manpower and material resources.

[0015] It is further preferred that the lower square cylinders of the left and right adjacent retractable supporting legs are connected by a lower cross beam installed on the transport vehicle, and the adjacent middle square cylinders of the four retractable supporting legs are connected by an upper cross beam. The fixed end of the hydraulic cylinder located below is installed on the transport vehicle, and the retractable end is vertically connected to the top of the middle square cylinder, so as to drive the middle square cylinder to rise and fall. The fixed end of the hydraulic cylinder located above is installed on the upper cross beam, and the retractable end is vertically connected to the lifting platform. The height of the lifting platform can be adjusted by correspondingly adjusting the position of the middle section and / or upper square cylinder by the hydraulic cylinder.

[0016] It is further preferred that the top side of the water-mill drilling rig placement platform is equipped with a wedge-shaped block anti-slip device that can lock the water-mill drilling rig tire, and an oblique support rod is provided between the bottom side and the transport vehicle, the top of the oblique support rod is hinged to the water-mill drilling rig placement platform, and the bottom end is hinged with a slider, and the transport vehicle is correspondingly provided with a slide for the longitudinal movement of the slider, and positioning holes are provided at intervals on the top of the slide, the slider is provided with mounting holes that can correspond to the positioning holes up and down, and is equipped with pins that pass through the mounting holes and the positioning holes for fixing, so that when the hydraulic cylinder drives the lifting platform to the required height, the bottom end of the oblique support rod is fixed by inserting the pin into the mounting holes and the positioning holes, and the oblique support rod plays an auxiliary supporting role while strengthening the stability of the overall structure of the lifting platform.

[0017] Further preferably, the water-grinding drilling rig includes a drilling rig body, a drill barrel for drilling core samples, a driving motor for driving the drill barrel to rotate, a drill tooth located at the front end of the drill barrel and a core impact hammer arranged in the drill barrel away from the drill tooth, the core impact hammer is aimed at the front end of the core sample, so that the connection between the core sample and the matrix rock can be broken by hitting the core sample. Compared with the current method that requires manual hand-held tools to be inserted into the annular gap between the core sample and the matrix rock after cutting the core sample, and then the core sample is tilted to break it from the matrix rock, the core impact hammer is used to directly hit the end of the core sample, so that the connection between the core sample and the matrix rock can be broken. This method is convenient and fast, and the operation is simple. After the drill barrel brings out the rock sample, the core impact hammer hits the end of the core sample again to make it separate from the drill barrel, thereby effectively solving the problem of core jamming in the drill barrel, ensuring construction quality, and having a clever structural design.

[0018] More preferably, the core impact hammer adopts a hydraulic pneumatic hammer, and the choice is reasonable, and a micro hydraulic pneumatic hammer can be adopted.

[0019] More preferably, in step S3, the two splitting bars are preferably placed in holes where there are surrounding rock cracks between adjacent holes, so that more cracks can be split with the help of the original surrounding rock cracks, maximizing the splitting capacity of the splitting bars and improving the efficiency of splitting rock construction.

[0020] The splitting bar installation tooling includes a crawler forklift, a splitting bar placement groove installed on the crawler forklift fork, a protective cover installed on the splitting bar placement groove and a splitting bar booster hydraulic cylinder installed on the crawler forklift fork. The splitting bar placement groove is a "U"-shaped structure, and the left and right side tops extend horizontally outward and are respectively overlapped and fixed on the left and right forks of the crawler forklift. The protective cover and the splitting bar placement groove form a space for accommodating the splitting bar, and the splitting bar placed in the splitting bar placement groove can be pushed into the corresponding hole by the hydraulic rod of the splitting bar booster hydraulic cylinder.

[0021] At present, there is a lack of special tooling for the installation of splitting bars, and it can only be installed by

[0022] It is further preferred that, in step S5, the inspection and acceptance process is to analyze the construction time of each process, analyze the reasons for the abnormal time consumption of the construction process, and propose improvement measures, so as to improve the construction efficiency index; check the appearance effect of the excavation contour of the face, timely analyze the reasons and correct relevant construction parameters such as the spacing arrangement of peripheral holes and splitting holes, so as to improve technical and economic indicators.

[0023] Beneficial effects of the present invention:

[0024] (1) Compared with the current traditional hydraulic breaker and cantilever tunnel boring machine excavation construction method, this scheme introduces water-grinding drill non-explosive excavation into the tunnel cycle construction, forming an excavation method of drilling and coring with a water-grinding drill, splitting with a splitter, and chiseling with a breaker. Compared with the traditional hydraulic breaker and cantilever tunnel boring machine excavation construction method, the construction speed is increased by 60.22%. At the same time, the vibration speed monitoring equipment in the operating line shows that there is vibration only when the breaker is chiseling, and the vibration speed is about 0.15cm / s, which has no impact on the operating equipment of the operating line. The construction efficiency is high and the overall process generates little vibration.

[0025] (2) A water-mill drill lifting and transporting vehicle is used to move the water-mill drill rig to drill and coring along the contour line of the face, leaving holes arranged along the intersection of the step contour line on the face. Holes are left after uniform excavation along the middle of the face. The over-excavation loss rate of the tunnel is reduced by 50.43%, 1.1 cubic meters of shotcrete are saved per linear meter, and 450 yuan is saved per linear meter. In addition, drilling along the contour line of the face and drilling uniformly in the middle can effectively reduce the strength of the face, produce more cracks, and ensure the subsequent splitting and chiseling effects.

[0026] In summary, the present invention has the advantages of high construction efficiency, low vibration in the overall process, greatly improved excavation construction speed, reduced tunnel over-excavation loss rate, and cost savings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a construction process flow chart of the present invention.

[0028] Figure 2 It is a schematic diagram of step S2 of the present invention.

[0029] Figure 3 for Figure 2 Side view of.

[0030] Figure 4 This is the layout diagram of the step holes on the face.

[0031] Figure 5 It is the structural diagram of the lifting platform.

[0032] Figure 6 This is a schematic diagram of the interior of the drill barrel of a water-mill drilling rig.

[0033] Figure 7 Schematic diagram of the structure of the splitting rod installation tooling.

[0034] Figure 8 for Figure 7 A side view of the protective cover is not shown.

[0035] Fig. 9 The cross-sectional view is a view showing a splitting rod being placed in a space formed by a protective cover and a splitting rod placement groove. DETAILED DESCRIPTION

[0036] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0037] Combination Figure 1 — Fig. 9 As shown, a fast construction method for static excavation of hard rock tunnels is described, and the specific implementation steps are as follows:

[0038] Step S1, setting out the excavation contour line of the tunnel face 1 according to the control wire in the tunnel, and marking the center position of the core drilling;

[0039] Step S2, using a water-mill drill lifting and transporting vehicle b to transport the water-mill drill rig a to the upper step of the tunnel face 1 and align it with the center position of the coring to perform coring one by one, thereby leaving holes 2 arranged along the intersection of the contour line of the upper step of the tunnel face 1 and holes 2 evenly distributed in the middle;

[0040] In step S2, the holes 2 on the contour line of the tunnel face 1 intersect with each other by 20 mm to 22 mm, the holes 2 in the middle of the tunnel face 1 are arranged in an oblique array, and the outermost holes 2 are 68 cm to 70 cm away from the holes 2 on the contour line of the tunnel face 1, the spacing between adjacent holes 2 in a horizontal row is 1000 mm to 1100 mm, and the spacing between adjacent holes 2 in a vertical row is 500 mm to 520 mm.

[0041] In step S2, two water-mill drill lifting and transport vehicles b and the corresponding water-mill drill rigs a are symmetrically arranged on the left and right sides, and drill and coring are performed synchronously on the left and right sides of the face 1 respectively. As the amount of drilling slag accumulation exceeds the standard, one water-mill drill lifting and transport vehicle b withdraws to make room for a wheeled excavator to enter and remove the accumulated drilling slag on the face.

[0042] In step S2, the water-grinding drill lifting and transporting vehicle b is composed of a transporting vehicle b1 and a lifting platform b2 located on the top surface of the transporting vehicle b1.

[0043] The chassis of the transport vehicle b1 is symmetrically provided with four ground-supporting screw rods b11. The left and right lifting platforms b2 are connected by a horizontal double-headed screw rod b6. The outer side of the lifting platform b2 is connected to the corresponding side wall by an oblique double-headed screw rod b7 extending outward and upward.

[0044] The lifting platform b2 is composed of a water-mill drilling rig placement platform b21 and retractable supporting legs b22 which are symmetrically arranged at the four corners of the bottom of the water-mill drilling rig placement platform b21.

[0045] The telescopic supporting leg b22 is composed of three sections of square cylinders b221 which are sequentially mounted inside and outside and two hydraulic cylinders b222 which respectively drive the middle section and the upper section of the square cylinder b221 to rise and fall.

[0046] The square cylinders b221 are each vertically spaced apart with a row of mounting sockets, and the connections between adjacent sections of the square cylinders b221 are equipped with pins that can pass through corresponding inner and outer mounting sockets for fixed connection. The lower section of the square cylinder b221 is fixed on the transport vehicle b1, and the top of the upper section of the square cylinder b221 is fixedly connected to the lifting platform b2.

[0047] The lower square tubes b221 of the left and right adjacent telescopic supporting legs b22 are connected by a lower cross beam b4 installed on the transport vehicle b1.

[0048] The adjacent middle-section square cylinders b221 of the four retractable supporting legs b22 are connected by an upper crossbeam b3. The fixed end of the hydraulic cylinder b222 located below is installed on the transport vehicle b1, and the retractable end is vertically connected to the top of the middle-section square cylinder b221, thereby driving the lifting and lowering of the middle-section square cylinder b221.

[0049] The fixed end of the hydraulic cylinder b222 located above is installed on the upper cross beam b3, and the telescopic end is vertically connected to the lifting platform b2. The height of the lifting platform b2 can be adjusted by adjusting the position of the middle section and / or the upper section square tube b221 through the hydraulic cylinder b222.

[0050] The top side of the water-mill drilling rig placement platform b21 is equipped with a wedge-shaped block anti-slip device b211 that can lock the tire of the water-mill drilling rig a, and an oblique support rod b5 is arranged between the bottom side and the transport vehicle b1.

[0051] The top end of the oblique support rod b5 is hinged to the water-mill drilling rig placement platform b21, and the bottom end is hinged to be provided with a sliding block b51.

[0052] The transport vehicle b1 is correspondingly provided with a slideway b12 for the longitudinal movement of the slider, and positioning holes are provided at intervals at the front and rear ends of the top of the slideway b12.

[0053] The slider b51 is provided with a mounting hole that can correspond to the positioning hole up and down, and is equipped with a pin that passes through the mounting hole and the positioning hole for fixing.

[0054] The water-grinding drilling rig a consists of a drilling rig body a5, a drill barrel a2 for drilling a core sample a1, a driving motor for driving the drill barrel a2 to rotate, a drill tooth a3 located at the front end of the drill barrel a2, and a core impact hammer a4 arranged in the drill barrel a2 away from the drill tooth a3.

[0055] The core hammer a4 is aimed at the front end of the core sample a1, so that the connection between the core sample a1 and the matrix rock can be broken by striking the core sample a1.

[0056] The core impact hammer a4 is preferably a hydraulic pneumatic hammer.

[0057] Step S3, using the splitting rod installation tool c to place two splitting rods d in adjacent holes 2 respectively, and then start splitting, and repeat the cycle from top to bottom along the tunnel face 1 to fill the adjacent holes 2 and split until all the holes 2 are split;

[0058] In step S3, the two splitting rods d are preferably placed in holes 2 where there are surrounding rock cracks between adjacent holes 2.

[0059] The splitting bar installation tool c is composed of a crawler forklift c1, a splitting bar placement groove c2 installed on the fork of the crawler forklift c1, a protective cover c3 installed on the splitting bar placement groove c2, and a splitting bar boosting hydraulic cylinder c4 installed on the fork of the crawler forklift c1.

[0060] The splitting bar placement groove c2 is in a "U"-shaped structure, and the tops of the left and right sides extend horizontally outward and are respectively overlapped and fixed on the left and right forks of the crawler forklift c1.

[0061] The protective cover c3 and the splitting rod placement groove c2 form a space for placing the splitting rod d. The splitting rod d placed in the splitting rod placement groove c2 can be pushed into the corresponding hole 2 by the hydraulic rod of the splitting rod booster hydraulic cylinder c4.

[0062] Step S4, using a breaker hammer to chisel away the tunnel face 1 from top to bottom along the contour line of the tunnel face 1, and then correcting the coring corners of the water-mill drill a at the design contour line until the excavation contour line meets the design requirements.

[0063] Step S5, construct the step below the face 1 according to steps S2-S4, and inspect and accept after each cycle of excavation is completed.

[0064] In step S5, the inspection and acceptance process is to analyze the construction time of each process, analyze the reasons for the abnormal time consumption of the construction process, and propose improvement measures to improve the construction efficiency indicators; check the appearance of the excavation contour of the face, analyze the reasons in time and correct the relevant construction parameters such as the spacing arrangement of the surrounding holes and splitting holes, so as to improve the technical and economic indicators.

Claims

1. A fast construction method for static excavation of hard rock tunnels, characterized in that: The following steps are involved: Step S1, setting out the excavation contour line of the tunnel face (1) according to the control wire in the tunnel, and marking the center position of the core drilling; Step S2, using a water-drilling drilling machine (b) to transport the water-drilling drilling machine (a) to the upper step of the tunnel face (1) and align it with the center position of the core drilling to perform core drilling one by one, thereby leaving holes (2) arranged along the intersection of the contour line of the upper step of the tunnel face (1) and holes (2) evenly distributed in the middle; Step S3, using a splitting rod installation tool (c) to place two splitting rods (d) in adjacent holes (2), and then start splitting, and repeat the cycle from top to bottom along the tunnel face (1) to fill the adjacent holes (2) and split until all the holes (2) are split; Step S4, using a breaker hammer to chisel away the tunnel face (1) from top to bottom along the contour line of the tunnel face (1), and then correcting the coring corners of the water-mill drill (a) at the design contour line until the excavation contour line meets the design requirements; Step S5, construct the lower step of the tunnel face (1) according to steps S2-S4, and inspect and accept after each cycle of excavation is completed.

2. The method for rapid static excavation of a hard rock tunnel according to claim 1 is characterized in that: In the step S2, the holes (2) on the contour line of the face (1) intersect with each other by 20 mm to 22 mm, the holes (2) in the middle of the face (1) are arranged in an oblique array, and the distance between the outermost holes (2) and the holes (2) on the contour line of the face (1) is 68 cm to 70 cm, the spacing between adjacent holes (2) in a horizontal row is 1000 mm to 1100 mm, and the spacing between adjacent holes (2) in a vertical row is 500 mm to 520 mm.

3. The method for rapid static excavation of a hard rock tunnel according to claim 1 is characterized in that: In step S2, two water-mill drill lifting and transporting vehicles (b) and the corresponding water-mill drill rigs (a) are symmetrically arranged on the left and right sides, and the left and right sides of the face (1) are drilled and cored simultaneously. When the amount of drilling slag accumulation exceeds the standard, one water-mill drill lifting and transporting vehicle (b) withdraws to make room for the wheeled excavator to enter and remove the accumulated slag on the face.

4. The method for rapid static excavation of a hard rock tunnel according to claim 3 is characterized in that: In step S2, the water-mill drill lifting and transporting vehicle (b) comprises a transporting vehicle (b1) and a lifting platform (b2) located on the top surface of the transporting vehicle (b1), the bottom frame of the transporting vehicle (b1) is symmetrically provided with four ground-supporting screw rods (b11), the left and right lifting platforms (b2) are connected by a horizontal double-headed screw rod (b6), the outer side of the lifting platform (b2) and the corresponding side wall are connected by an oblique double-headed screw rod (b7) extending outward and upward, the lifting platform (b2) comprises a water-mill drill rig placement platform (b21) and four symmetrical ground-supporting screw rods (b11) located at the bottom corners of the water-mill drill rig placement platform (b21). A retractable supporting leg (b22) is provided, and the retractable supporting leg (b22) includes three sections of square cylinders (b221) which are sequentially mounted inside and outside and two hydraulic cylinders (b222) which respectively drive the middle section and the upper section of the square cylinder (b221) to rise and fall. The square cylinders (b221) are each vertically spaced apart and provided with a row of mounting sockets, and the connection between adjacent sections of the square cylinders (b221) is provided with a pin which can pass through the corresponding mounting sockets inside and outside for fixed connection. The lower section of the square cylinder (b221) is fixed on the transport vehicle (b1), and the top of the upper section of the square cylinder (b221) is fixedly connected to the lifting platform (b2).

5. The method for rapid static excavation of a hard rock tunnel according to claim 4 is characterized in that: The lower square tubes (b221) of the adjacent telescopic supporting legs (b22) on the left and right are connected by a lower cross beam (b4) installed on the transport vehicle (b1), and the adjacent middle square tubes (b221) of the four telescopic supporting legs (b22) are connected by an upper cross beam (b3). The fixed end of the hydraulic cylinder (b222) located below is installed on the transport vehicle (b1), and the telescopic end is vertically connected to the top of the middle square tube (b221), so as to drive the lifting of the middle square tube (b221). The fixed end of the hydraulic cylinder (b222) located above is installed on the upper cross beam (b3), and the telescopic end is vertically connected to the lifting platform (b2). The height of the lifting platform (b2) can be adjusted by adjusting the position of the middle section and / or the upper square tube (b221) accordingly through the hydraulic cylinder (b222).

6. The method for rapid static excavation of a hard rock tunnel according to claim 4, characterized in that: The top side of the water-mill drilling rig placement platform (b21) is equipped with a wedge-shaped anti-slip device (b211) capable of locking the tire of the water-mill drilling rig (a), and an oblique support rod (b5) is provided between the bottom side and the transport vehicle (b1); the top end of the oblique support rod (b5) is hinged to the water-mill drilling rig placement platform (b21), and the bottom end is hinged with a slider (b51); the transport vehicle (b1) is correspondingly provided with a slideway (b12) for the longitudinal movement of the slider, and the top of the slideway (b12) is provided with positioning holes at intervals in front and behind, and the slider (b51) is provided with installation holes that can correspond to the positioning holes up and down, and is equipped with a latch that passes through the installation holes and the positioning holes for fixing.

7. The method for rapid static excavation of a hard rock tunnel according to claim 4, characterized in that: The water-grinding drilling rig (a) comprises a drilling rig body (a5), a drill barrel (a2) for drilling a core sample (a1), a driving motor for driving the drill barrel (a2) to rotate, a drill tooth (a3) ​​located at the front end of the drill barrel (a2), and a core impact hammer (a4) arranged in the drill barrel (a2) away from the drill tooth (a3). The core impact hammer (a4) is aimed at the front end of the core sample (a1), so that the connection between the core sample (a1) and the parent rock can be broken by impacting the core sample (a1).

8. The method for rapid static excavation of a hard rock tunnel according to claim 7, characterized in that: The core impact hammer (a4) is a hydraulic pneumatic hammer.

9. The method for rapid static excavation of a hard rock tunnel according to claim 1, characterized in that: In the step S3, the two splitting rods (d) are preferably placed in holes (2) with surrounding rock cracks between adjacent holes (2). The splitting rod installation tool (c) comprises a crawler forklift (c1), a splitting rod placement groove (c2) installed on the fork of the crawler forklift (c1), a protective cover (c3) installed on the splitting rod placement groove (c2) and a splitting rod boosting hydraulic cylinder (c3) installed on the fork of the crawler forklift (c1). The splitting rod placement groove (c2) is a "U"-shaped structure, and the tops of the left and right sides extend horizontally outward and are respectively overlapped and fixed on the left and right forks of the crawler forklift (c1). The protective cover (c3) and the splitting rod placement groove (c2) form a space for accommodating the splitting rod (d). The splitting rod (d) placed in the splitting rod placement groove (c2) can be pushed into the corresponding hole (2) by the hydraulic rod of the splitting rod boosting hydraulic cylinder (c3).

10. The method for rapid static excavation of a hard rock tunnel according to claim 1, characterized in that: In step S5, the inspection and acceptance process is to analyze the construction time of each process, analyze the reasons for the abnormal time consumption of the construction process, and propose improvement measures; check the appearance of the excavation profile of the face, analyze the reasons in time and correct the relevant construction parameters of the spacing arrangement of the surrounding holes and splitting holes.

Images