Method for excavating rock bench of palisade crane beam

Abstract

The invention relates to a method for excavating a rock bench of a palisade crane beam, and relates to the technical field of water conservancy and hydropower engineering. According to the rock wall crane beam rock bench excavation method, the placement amount and the standard of the detonating cord are determined according to the rock strength and the integrity degree, detonation waves in a blast hole act uniformly during blasting, the excavation flatness and the half-hole rate can be improved, overexcavation is reduced, damage of blasting to surrounding rock is reduced, the surrounding rock blasting loosening circle is reduced, the blasting excavation quality is effectively improved, and the rock bench excavation efficiency is improved. The method has important significance on later operation safety of the rock wall crane beam, the construction cost is reduced, the linear construction period is shortened, and the construction efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water conservancy and hydropower engineering, and in particular to a method for excavating a rock wall crane beam rock platform. Background Art

[0002] In the design of underground powerhouses for conventional hydropower stations and pumped storage power stations, the excavation of the rock platform for the rock wall crane beam is a key link in the construction process and also a technical difficulty. Since the shaping process of the rock platform excavation is extremely difficult and the precision requirements are very high, the looseness of the surrounding rock must be strictly controlled during the construction process.

[0003] At present, the excavation of the crane beam rock platform on the rock wall of the underground powerhouse usually adopts the blasting of emulsion explosives at intervals in the hole without coupling. However, the emulsion explosives are distributed in a point-like manner in the blasting hole, resulting in uneven and relatively concentrated distribution of the explosives. This uneven charging method makes the detonation wave action of the charged part and the uncharged part uneven, resulting in serious damage to the surrounding rock of the charged part after blasting, uneven rock surface, and difficulty in achieving the expected blasting effect. In addition, if improperly controlled, it may cause the tearing and collapse of the rock platform, which will affect the structural safety and bring hidden dangers to construction safety. At the same time, after the rock platform collapses, additional measures such as strengthening support and using concrete reinforcement support are required, which will occupy the construction period and increase the construction cost. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related technology, the present application provides a method for excavating a rock wall crane beam rock platform, which can improve the excavation flatness, semi-porosity, reduce over-excavation, reduce the damage of blasting to the surrounding rock, reduce the blasting loosening circle of the surrounding rock, and effectively improve the blasting excavation quality.

[0005] The present application provides a method for excavating a rock wall crane beam rock platform, the method comprising:

[0006] (1) Drilling and excavation:

[0007] Drill and protect the vertical blasting holes of the rock platform on the table surface of the reserved protective layer of the rock platform, excavate the part outside the reserved protective layer of the rock platform, and drill and protect the inclined blasting holes of the rock platform on the side wall of the reserved protective layer of the rock platform according to the position of the vertical blasting holes of the rock platform;

[0008] (2) Determine the amount of detonating cord to be placed based on rock strength and integrity:

[0009] When the rock strength of the rock platform is greater than 60MPa, a detonating cord with a charge density of 70 to 90 g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact;

[0010] When the rock strength of the rock platform is less than 60MPa and greater than 30MPa, a detonating cord with a charge density of 50 to 70g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact;

[0011] When the rock strength of the rock platform is less than 30MPa, a detonating cord with a charge density of 20 to 50g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact;

[0012] (3) Detonating cord placement:

[0013] Arrange multiple detonating cords in the same direction according to the detonation direction of the detonating cords and weave them into a twist shape, and tie and fix the braided detonating cords in a PVC half pipe to obtain a detonating device;

[0014] The prepared detonation device is respectively installed into each vertical blasting hole of the rock platform and the inclined blasting hole of the rock platform;

[0015] (4) Electronic detonator detonation:

[0016] Use electronic detonators to connect the detonating cords in each vertical blasting hole and the inclined blasting hole of the rock platform in series. After the connection is completed, blasting can be carried out through the electronic detonators to complete the excavation of the rock wall crane beam rock platform.

[0017] Optionally, in some embodiments of the present application:

[0018] The detonation velocity of the detonating cord shall not be less than 6000m / s, the diameter of the detonating cord shall not be greater than 6mm, and the charge of each detonating cord shall not be less than 11g / m;

[0019] When the rock strength of the rock platform is greater than 60MPa, the number of detonating cords placed in each vertical blasting hole and inclined blasting hole facing the rock platform shall be no less than 7;

[0020] When the rock strength of the rock platform is less than 60MPa and greater than 30MPa, the number of detonating cords placed in each vertical blasting hole and inclined blasting hole facing the rock platform shall be no less than 5;

[0021] When the rock strength of the rock platform is less than 30MPa, no less than 2 detonating cords shall be placed in each vertical blasting hole and inclined blasting hole of the rock platform facing the rock platform.

[0022] Optionally, in some embodiments of the present application:

[0023] The prepared detonation device is respectively installed into each vertical blasting hole and the inclined blasting hole of the rock platform, specifically including:

[0024] When installing the detonating device into the vertical blasting hole and the inclined blasting hole of the rock platform, the outer wall of the PVC half pipe is facing the structural surface of the rock platform, and the detonating cord is facing the volley surface to be blasted.

[0025] Optionally, in some embodiments of the present application:

[0026] The method uses electronic detonators to connect the detonating cords in each vertical blasting hole of the rock platform and the blasting hole on the inclined surface of the rock platform in series, specifically including:

[0027] The detonating cords in the vertical blasting holes of the rock platform and the inclined blasting holes of the rock platform are connected in series and networked with electronic detonators to carry out two-way smooth blasting.

[0028] Optionally, in some embodiments of the present application:

[0029] The blasting segment length of the rock platform is: 20m~30m;

[0030] Before blasting, horizontally drill empty holes and block holes in the sections between adjacent blasting sections;

[0031] The blocking hole is made by a rock drilling rig. The depth of the blocking hole is consistent with the thickness of the rock platform protective layer. The diameter of the blocking hole is 64mm and the hole spacing is 150mm.

[0032] Optionally, in some embodiments of the present application:

[0033] The drilling and protection of vertical blasting holes on the rock platform on the surface of the reserved protective layer of the rock platform specifically includes:

[0034] According to the preset position of the vertical blasting hole of the rock platform, a steel pipe sample frame is set up on the table surface of the reserved protective layer of the rock platform, and a positioning guide pipe is installed on the steel pipe sample frame;

[0035] Use a hand drill to install the positioning guide tube and drill vertical blasting holes on the rock platform on the table top with reserved protective layer. After acceptance, insert a PVC pipe into the hole to protect it from collapse, and spray foam glue at the hole mouth to prevent fine slag from falling in and clogging it.

[0036] Optionally, in some embodiments of the present application:

[0037] The distance between the vertical blasting holes on this rock platform is 30 to 40 cm;

[0038] When the rock integrity is good, the hole spacing is 40 cm, and when the rock integrity is poor, the hole spacing is 30 cm.

[0039] Optionally, in some embodiments of the present application:

[0040] The part outside the reserved protective layer of the rock platform shall be excavated, including:

[0041] Partition the area outside the reserved protective layer of the rock platform and carry out excavation in sections.

[0042] Optionally, in some embodiments of the present application:

[0043] According to the position of the vertical blasting hole of the rock platform, the blasting hole of the inclined surface of the rock platform is drilled and protected on the side wall of the reserved protective layer of the rock platform, specifically including:

[0044] According to the position of the vertical blasting hole of the rock platform, a steel pipe sample frame is set up next to the reserved protective layer of the rock platform, and a positioning guide pipe is installed on the steel pipe sample frame to locate the inclined blasting hole of the rock platform so that the inclined blasting hole of the rock platform is connected with the vertical blasting hole of the rock platform after drilling;

[0045] The drilling of the blasting hole on the inclined surface of the rock platform is completed by installing the positioning guide tube with a hand drill. After acceptance, a PVC pipe is inserted into the hole to protect the hole from collapse, and foam glue is sprayed at the hole mouth to prevent fine slag from falling in and clogging it.

[0046] Optionally, in some embodiments of the present application:

[0047] The blasting hole on the inclined surface of the rock platform was drilled 5cm beyond the designed excavation line.

[0048] The technical solution provided by this application may have the following beneficial effects:

[0049] The present application determines the placement amount and standard of detonating cord according to the strength and integrity of the rock, and the detonation wave acts evenly in the blasthole during blasting, which can improve the excavation flatness and semi-hole rate, reduce over-excavation, reduce the damage to the surrounding rock caused by blasting, reduce the blasting loosening circle of the surrounding rock, and effectively improve the blasting excavation quality. It is of great significance to the safety of the later operation of the rock wall crane beam, reduces the construction cost, saves the linear construction period, and improves the construction efficiency.

[0050] The present application ensures that the detonating cord will not shift or loosen during the loading and blasting process by tying and fixing the braided detonating cord in the PVC half-tube. At the same time, by turning the outer wall of the PVC half-tube 5 toward the rock platform structural surface and the detonating cord 4 toward the aerial surface to be blasted, the PVC half-tube 5 can be used to protect the surrounding rock, effectively reducing the damage to the surrounding rock of the structural surface caused by blasting.

[0051] This application can ensure the drilling accuracy of vertical blasting holes and inclined blasting holes on the rock platform through the use of steel pipe sample frames and positioning guide tubes. At the same time, the protective measures of PVC pipes and foam glue are used to effectively reduce the risks of drilling collapse and blockage, ensuring the safety of drilling during the construction process.

[0052] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0054] Figure 1 It is a structural schematic diagram of a method for excavating a rock platform with a rock wall crane beam in an embodiment of the present application;

[0055] Figure 2 It is a front view structural schematic diagram of a rock platform in a rock wall crane beam in an embodiment of the present application;

[0056] Figure 3 This is a schematic diagram of the internal structure of the rock platform reserved protective layer in the embodiment of the present application;

[0057] Figure 4 It is a side view structural schematic diagram of the rock platform in the rock wall crane beam in the embodiment of the present application.

[0058] Figure numerals: 1-rock platform reserved protective layer, 2-rock platform vertical blasting hole, 3-rock platform inclined blasting hole, 4-detonating cord, 5-PVC half pipe, 6-blocking hole, 7-electronic detonator. DETAILED DESCRIPTION

[0059] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0060] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0061] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] At present, the excavation of the crane beam rock platform on the rock wall of the underground powerhouse usually adopts the blasting of emulsion explosives at intervals in the hole without coupling. However, the emulsion explosives are distributed in a point-like manner in the blasting hole, resulting in uneven and relatively concentrated distribution of the explosives. This uneven charging method makes the detonation wave action of the charged part and the uncharged part uneven, resulting in serious damage to the surrounding rock of the charged part after blasting, uneven rock surface, and difficulty in achieving the expected blasting effect. In addition, if improperly controlled, it may cause the tearing and collapse of the rock platform, which will affect the structural safety and bring hidden dangers to construction safety. At the same time, after the rock platform collapses, additional measures such as strengthening support and using concrete reinforcement support are required, which will occupy the construction period and increase the construction cost.

[0064] In response to the above problems, an embodiment of the present application provides a method for excavating a rock wall crane beam rock platform, which can improve the excavation flatness, semi-porosity, reduce over-excavation, reduce the damage to the surrounding rock caused by blasting, reduce the blasting loosening circle of the surrounding rock, and effectively improve the quality of blasting excavation.

[0065] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0066] Figure 1 It is a structural schematic diagram of a method for excavating a rock platform with a rock wall crane beam in an embodiment of the present application;

[0067] Figure 2 It is a front view structural schematic diagram of a rock platform in a rock wall crane beam in an embodiment of the present application;

[0068] Figure 3 This is a schematic diagram of the internal structure of the rock platform reserved protective layer in the embodiment of the present application;

[0069] Figure 4 It is a side view structural schematic diagram of the rock platform in the rock wall crane beam in the embodiment of the present application.

[0070] See also Figure 1-4 , a method for excavating a rock wall crane beam rock platform, the method comprising:

[0071] S100: (1) Drilling

[0072] The vertical blasting holes 2 of the rock platform are drilled and protected on the table surface of the reserved protective layer 1 of the rock platform, the part outside the reserved protective layer 1 of the rock platform is excavated, and according to the position of the vertical blasting holes 2 of the rock platform, the inclined blasting holes 3 of the rock platform are drilled and protected on the side wall of the reserved protective layer 1 of the rock platform.

[0073] Specifically, according to the preset position of the vertical blasting hole 2 of the rock platform, a steel pipe sample frame is set up on the table surface of the reserved protective layer 1 of the rock platform, and a positioning guide pipe is installed on the steel pipe sample frame;

[0074] Use a hand drill to install the positioning guide tube and drill the vertical blasting hole 2 on the table top of the reserved protective layer 1 of the rock platform. After acceptance, insert a PVC pipe into the borehole to protect the borehole from collapse, and spray foam glue at the borehole mouth to prevent fine slag from falling in and clogging it.

[0075] In this embodiment, the use of steel pipe sample frames and positioning guide tubes can ensure the drilling accuracy of the vertical blasting hole 2 on the rock platform. At the same time, the protection measures of PVC pipes and foam glue are adopted to effectively reduce the risks of drilling hole collapse and blockage, thereby ensuring the safety of drilling during the construction process.

[0076] Specifically, the hole spacing between the vertical blasting holes 2 of the rock platform is 30 to 40 cm;

[0077] When the rock integrity is good, the hole spacing is 40 cm, and when the rock integrity is poor, the hole spacing is 30 cm.

[0078] In this embodiment, the hole spacing between the vertical blasting holes 2 of the rock platform is 35 cm. By setting a reasonable hole spacing, the effect of subsequent blasting construction can be effectively guaranteed.

[0079] Specifically, the partial area outside the reserved protective layer 1 of the rock platform is divided into zones, and excavation is performed in zones.

[0080] In this embodiment, by excavating in different areas, construction risks can be better controlled, problems can be discovered and dealt with in a timely manner, and the safety and efficiency of construction can be effectively improved.

[0081] Specifically, according to the position of the vertical blasting hole 2 of the rock platform, the drilling and protection of the rock platform inclined blasting hole 3 are carried out on the side wall of the reserved protective layer 1 of the rock platform, which specifically includes:

[0082] According to the position of the vertical blasting hole 2 of the rock platform, a steel pipe sample frame is set up next to the reserved protective layer 1 of the rock platform, and a positioning guide pipe is installed on the steel pipe sample frame to locate the inclined blasting hole 3 of the rock platform, so that the inclined blasting hole 3 of the rock platform is connected with the vertical blasting hole 2 of the rock platform after drilling;

[0083] The drilling of the blasting hole 3 on the inclined surface of the rock platform is completed by installing the positioning guide tube with a hand drill. After acceptance, a PVC pipe is inserted into the borehole to protect the borehole from collapse, and foam glue is sprayed at the borehole mouth to prevent fine slag from falling in and clogging it.

[0084] In this embodiment, the use of steel pipe sample frames and positioning guide tubes can ensure the drilling accuracy of the rock platform slope blasting hole 3. At the same time, the protection measures of PVC pipes and foam glue are adopted to effectively reduce the risks of drilling hole collapse and blockage, thereby ensuring the safety of drilling during the construction process.

[0085] Specifically, the blasting hole 3 on the rock platform slope is drilled 5 cm beyond the designed excavation line.

[0086] In this embodiment, by drilling the rock platform inclined surface blasting hole 3 5 cm beyond the designed excavation line, it can be ensured that the rock platform inclined surface blasting hole 3 is accurately connected with the vertical blasting hole, so that the rock is evenly broken after blasting, thereby ensuring the blasting effect.

[0087] In this embodiment, the steel pipe sample frame pole needs to be inserted into the rock 50cm, and if the rock is loose, grouting is required before inserting the pole to ensure the stability of the sample frame during the drilling process. At the same time, in order to ensure the drilling accuracy of the blast hole, positioning pin devices are installed at both ends of the positioning guide tube.

[0088] S200: (2) Determine the amount of detonating cord to be placed based on rock strength and integrity:

[0089] When the rock strength of the rock platform is greater than 60MPa, a detonating cord with a charge density of 70 to 90 g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact;

[0090] When the rock strength of the rock platform is less than 60MPa and greater than 30MPa, a detonating cord with a charge density of 50 to 70g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact;

[0091] When the rock strength of the rock platform is less than 30MPa, a detonating cord with a linear charge density of 20 to 50g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact.

[0092] Specifically, the detonation velocity of the detonating cord 4 is not less than 6000 m / s, the diameter of the detonating cord 4 is not greater than 6 mm, and the amount of each detonating cord 4 is not less than 11 g / m;

[0093] When the rock strength of the rock platform is greater than 60MPa, the number of detonating cords placed in each vertical blasting hole and inclined blasting hole facing the rock platform shall be no less than 7;

[0094] When the rock strength of the rock platform is less than 60MPa and greater than 30MPa, the number of detonating cords placed in each vertical blasting hole and inclined blasting hole facing the rock platform shall be no less than 5;

[0095] When the rock strength of the rock platform is less than 30MPa, no less than 2 detonating cords shall be placed in each vertical blasting hole and inclined blasting hole of the rock platform facing the rock platform.

[0096] In this embodiment, by determining the placement amount and standard of the detonating cord 4 according to the rock strength and integrity, the detonation wave acts evenly in the blasthole during blasting, which can improve the excavation flatness and semi-pore rate, reduce over-excavation, reduce the damage to the surrounding rock caused by blasting, reduce the blasting loosening circle of the surrounding rock, and effectively improve the blasting excavation quality. It is of great significance to the safety of the later operation of the rock wall crane beam, reduce the construction cost, save the linear construction period, and improve the construction efficiency.

[0097] S300: (3) Detonating cord placement

[0098] Arrange multiple detonating cords 4 in the same direction according to the detonation direction of the detonating cords 4 and weave them into a twist shape, and tie and fix the weaved detonating cords 4 in the PVC half pipe 5 to obtain a detonating device;

[0099] The manufactured detonating device is respectively installed into each vertical blasting hole 2 of the rock platform and each inclined blasting hole 3 of the rock platform.

[0100] Specifically, when the detonating device is installed into the vertical blasting hole 2 and the inclined blasting hole 3 of the rock platform, the outer wall of the PVC half pipe 5 is oriented toward the structural surface of the rock platform, and the detonating cord 4 is oriented toward the volley surface to be blasted.

[0101] In this embodiment, tape is used for winding and fixing. By tying and fixing the braided detonating cord 4 in the PVC half-tube 5, it can be ensured that the detonating cord 4 will not shift or loosen during the loading and blasting process. At the same time, by turning the outer wall of the PVC half-tube 5 toward the rock platform structural surface and the detonating cord 4 toward the aerial surface to be blasted, the PVC half-tube 5 can be used to protect the surrounding rock, effectively reducing the damage to the surrounding rock of the structural surface caused by blasting.

[0102] S400: (4) Electronic detonator detonation

[0103] The electronic detonator 7 is used to connect the detonating cord 4 in each rock platform vertical blasting hole 2 and the rock platform inclined blasting hole 3. After the connection is completed, the electronic detonator 7 can be used for blasting to complete the excavation of the rock wall crane beam rock platform.

[0104] Specifically, the detonating cords 4 in the vertical blasting holes 2 of the rock platform and the inclined blasting holes 3 of the rock platform are connected in series and networked with the electronic detonators 7 to perform bidirectional smooth blasting.

[0105] In this embodiment, by using the unified control of the electronic detonator 7, the blasting time can be accurately set to ensure the safety of the blasting construction.

[0106] Specifically, the blasting segment length of the rock platform is 20m to 30m.

[0107] Before blasting, empty holes and blocking holes 6 are drilled horizontally between adjacent blasting sections. The blocking holes 6 are drilled using a rock drilling rig. The depth of the blocking holes 6 is consistent with the thickness of the rock platform protective layer. The diameter of the blocking holes 6 is 64 mm and the hole spacing is 150 mm.

[0108] In this embodiment, by drilling blocking holes 6 horizontally between the rock platform blasting sections, it is possible to effectively avoid the tearing of the rocks in the unblasted rock platform range by the blasting of the previous rock platform, thereby ensuring the formation of the rock platform structure.

[0109] The technical solution in the embodiment of the present application includes the following beneficial effects:

[0110] The present application determines the placement amount and standard of the detonating cord 4 according to the rock strength and integrity, and the detonation wave acts evenly in the blasthole during blasting, which can improve the excavation flatness and semi-hole rate, reduce over-excavation, reduce the damage to the surrounding rock caused by blasting, reduce the blasting loosening circle of the surrounding rock, and effectively improve the blasting excavation quality. It is of great significance to the safety of the later operation of the rock wall crane beam, reduces the construction cost, saves the linear construction period, and improves the construction efficiency.

[0111] The present application ensures that the detonating cord 4 will not shift or loosen during the loading and blasting process by tying and fixing the braided detonating cord 4 in the PVC half-tube 5. At the same time, by turning the outer wall of the PVC half-tube 5 toward the rock platform structural surface and the detonating cord 4 toward the aerial surface to be blasted, the PVC half-tube 5 can be used to protect the surrounding rock, effectively reducing the damage to the surrounding rock of the structural surface caused by blasting.

[0112] This application uses steel pipe sample frames and positioning guide tubes to ensure the drilling accuracy of the vertical blasting holes 2 and the inclined blasting holes 3 of the rock platform. At the same time, the protective measures of PVC pipes and foam glue are used to effectively reduce the risks of drilling collapse and blockage, ensuring the safety of drilling during the construction process.

[0113] Finally, it should be noted that, in this article, relationships such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms include, include or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0114] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0115] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for excavating a rock wall crane beam rock platform, characterized in that: The method comprises: (1) Drilling and excavation: Drilling and protecting the vertical blasting holes of the rock platform on the table surface of the reserved protective layer of the rock platform, excavating the part outside the reserved protective layer of the rock platform, and drilling and protecting the inclined blasting holes of the rock platform on the side wall of the reserved protective layer of the rock platform according to the position of the vertical blasting holes of the rock platform; (2) Determine the amount of detonating cord to be placed based on rock strength and integrity: When the rock strength of the rock platform is greater than 60MPa, a detonating cord with a charge density of 70 to 90 g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact; When the rock strength of the rock platform is less than 60MPa and greater than 30MPa, a detonating cord with a charge density of 50 to 70g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact; When the rock strength of the rock platform is less than 30MPa, a detonating cord with a charge density of 20 to 50g / m is placed in each vertical blasting hole and inclined blasting hole of the rock platform, and the upper limit is taken when the rock is intact; (3) Detonating cord placement: Arrange multiple detonating cords in the same direction according to the detonation direction of the detonating cords and weave them into a twist shape, and tie and fix the braided detonating cords in a PVC half pipe to obtain a detonating device; The prepared detonation devices are respectively installed into each vertical blasting hole of the rock platform and the inclined blasting hole of the rock platform; (4) Electronic detonator detonation: Use electronic detonators to connect the detonating cords in each vertical blasting hole and the inclined blasting hole of the rock platform in series. After the connection is completed, blasting can be carried out through the electronic detonators to complete the excavation of the rock wall crane beam rock platform.

2. The method for excavating a rock wall crane beam rock platform according to claim 1, characterized in that: The detonation velocity of the detonating cord is not less than 6000m / s, the diameter of the detonating cord is not more than 6mm, and the amount of each detonating cord is not less than 11g / m; When the rock strength of the rock platform is greater than 60MPa, the number of detonating cords placed in each vertical blasting hole and inclined blasting hole facing the rock platform shall be no less than 7; When the rock strength of the rock platform is less than 60MPa and greater than 30MPa, the number of detonating cords placed in each vertical blasting hole and inclined blasting hole facing the rock platform shall be no less than 5; When the rock strength of the rock platform is less than 30MPa, no less than 2 detonating cords shall be placed in each vertical blasting hole and inclined blasting hole of the rock platform facing the rock platform.

3. The method for excavating a rock wall crane beam rock platform according to claim 2, characterized in that: The method of respectively installing the prepared detonation device into each vertical blasting hole and the inclined blasting hole of the rock platform comprises: When installing the detonating device into the vertical blasting hole and the inclined blasting hole of the rock platform, the outer wall of the PVC half pipe is facing the structural surface of the rock platform, and the detonating cord is facing the volley surface to be blasted.

4. The method for excavating a rock wall crane beam rock platform according to claim 3, characterized in that: The method of using electronic detonators to connect the detonating cords in each vertical blasting hole of the rock platform and the blasting hole on the inclined surface of the rock platform in series specifically includes: The detonating cords in the vertical blasting holes of the rock platform and the inclined blasting holes of the rock platform are connected in series and networked with electronic detonators to perform bidirectional smooth blasting.

5. The method for excavating a rock wall crane beam rock platform according to claim 4, characterized in that: The blasting segment length of the rock platform is: 20m to 30m; Before blasting, horizontally drill empty holes and block holes in the sections between adjacent blasting sections; The blocking holes are made by a rock drilling rig, the depth of the blocking holes is consistent with the thickness of the rock platform protective layer, the diameter of the blocking holes is 64 mm, and the hole spacing is 150 mm.

6. The method for excavating a rock wall crane beam rock platform according to claim 1, characterized in that: The drilling and protection of the vertical blasting holes on the rock platform on the table surface of the reserved protective layer of the rock platform specifically includes: According to the preset position of the vertical blasting hole of the rock platform, a steel pipe sample frame is set up on the table surface of the reserved protective layer of the rock platform, and a positioning guide pipe is installed on the steel pipe sample frame; Use a hand drill to install the positioning guide tube and drill vertical blasting holes on the rock platform on the table top with reserved protective layer. After acceptance, insert a PVC pipe into the hole to protect it from collapse, and spray foam glue at the hole mouth to prevent fine slag from falling in and clogging it.

7. The method for excavating a rock wall crane beam rock platform according to claim 6, characterized in that: The hole spacing between the vertical blasting holes on the rock platform is 30 to 40 cm; When the rock integrity is good, the hole spacing is 40 cm, and when the rock integrity is poor, the hole spacing is 30 cm.

8. The method for excavating a rock wall crane beam rock platform according to claim 7, characterized in that: The excavation of the portion outside the reserved protective layer of the rock platform specifically includes: Partition the area outside the reserved protective layer of the rock platform and perform excavation in sections.

9. The method for excavating a rock wall crane beam rock platform according to claim 8, characterized in that: According to the position of the vertical blasting hole of the rock platform, drilling and protecting the inclined blasting hole of the rock platform on the side wall of the reserved protective layer of the rock platform specifically include: According to the position of the vertical blasting hole of the rock platform, a steel pipe sample frame is set up next to the reserved protective layer of the rock platform, and a positioning guide pipe is installed on the steel pipe sample frame to locate the inclined blasting hole of the rock platform so that the inclined blasting hole of the rock platform is connected with the vertical blasting hole of the rock platform after drilling; The drilling of the blasting hole on the inclined surface of the rock platform is completed by installing the positioning guide tube with a hand drill. After acceptance, a PVC pipe is inserted into the hole to protect the hole from collapse, and foam glue is sprayed at the hole mouth to prevent fine slag from falling in and clogging it.

10. The method for excavating a rock wall crane beam rock platform according to claim 9, characterized in that: The blasting holes on the rock platform slope are drilled 5 cm beyond the designed excavation line.

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