A stress monitoring drill rod for grouting in broken rock mass

Abstract

The utility model provides a kind of stress monitoring drill pipe for broken rock mass grouting, including drill pipe base, main rod support cylinder, lifting drill pipe and support disc, the support disc is fixedly installed in the drill pipe base top center position, the main rod support cylinder is installed in the support disc top end.This scheme is through the double stress monitoring system of support insertion rod and fixed anchor nail, real-time capture stress distribution and anchoring state change of drill pipe base, when support point load is abnormal or anchoring fails, can prompt staff to carry out intervention mechanism in advance, avoid drill pipe inclination, hole wall collapse and other accidents, significantly improve operation safety, this scheme is through three groups of radial distribution's support insertion rod and bottom fixed anchor nail to form three-dimensional support system, effectively disperses reaction force in the process of drilling and grouting, the sharp end design of fixed anchor tip enhances the grip of broken rock formation, ensure the stability of equipment under complex geological conditions.

Description

Technical Field

[0001] This utility model relates to the field of grouting drill rod technology, specifically a stress monitoring drill rod for grouting fractured rock mass. Background Technology

[0002] In the field of geological engineering, the reinforcement and seepage prevention of fractured rock masses (such as fault fracture zones and rock masses with well-developed joints and fissures) is a key challenge for engineering safety. These rock masses, due to their loose structure, low strength, and high permeability, are prone to collapse, deformation, or sudden water and mud inrushes under excavation or loading. Grouting technology, as a core method for reinforcing fractured rock masses, injects grout (such as cement grout or chemical grout) into the rock fissures to fill the fissures, cement the rock blocks, and improve overall stability.

[0003] Traditional monitoring methods, such as core sampling and geophysical exploration, are post-event detection methods and cannot provide real-time feedback on the rock mass response during the grouting process, resulting in delays in construction adjustments. Furthermore, the monitoring equipment is independent of the drill pipe system, requiring additional sensors to be deployed, which increases the complexity and cost of construction. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a stress monitoring drill rod for grouting in fractured rock masses, which solves the problem mentioned in the background technology that the monitoring equipment is independent of the drill rod system, requiring additional sensor installation, which increases construction complexity and cost.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stress monitoring drill rod for grouting fractured rock mass, comprising a drill rod base, a main rod support cylinder, a lifting drill rod, and a support disc. The support disc is fixedly installed at the top center of the drill rod base. The main rod support cylinder is installed at the top of the support disc. The main rod support cylinder has a vertically connected lifting groove with an opening at the bottom. The opening at the bottom of the lifting groove passes through the support disc and the drill rod base. The lifting drill rod is located within the lifting groove and can move up and down. The lower end of the drill rod base has three outward-facing support monitoring cavities. An inclined support rod is fixedly installed within each support monitoring cavity. The support rod is rotatably connected to the support monitoring cavity. A stress monitor is installed at the top of the drill rod base above the support monitoring cavity. A limit plate is installed at the top of the support monitoring cavity. The limit plate is located above the support rod and abuts against the support rod. The detection line of the stress monitor is connected to the limit plate.

[0006] Preferably, the lower end of the lifting drill rod extends downward to below the drill rod base and is fixedly connected to a drill rod extension rod. The bottom of the drill rod extension rod is fixedly provided with a drill bit connection thread, and the surface of the drill bit connection thread is provided with threads.

[0007] Preferably, the tail end of the support rod is fixed with a fixed anchor tip, the head of which is pointed and used to insert into the working ground to achieve a fixing effect.

[0008] Preferably, the drill rod base has a positioning slot with an opening that extends vertically through one side. A fixing anchor can be inserted into the positioning slot, and a stress sensor is installed inside the fixing anchor. A stress sensing plate is installed inside the stress sensor.

[0009] Preferably, an information monitoring board is installed on the top of the positioning slot.

[0010] Preferably, an information transmission board is fixedly provided on one side of the outer end face of the main rod support cylinder, and a data wiring is installed and connected to the bottom of the information transmission board. The data wiring is connected to the stress monitor and the information monitoring board circuit.

[0011] This invention provides a stress monitoring drill rod for grouting in fractured rock masses. It has the following beneficial effects: 1. This solution uses a dual stress monitoring system of support rods and fixed anchors to capture the stress distribution and anchorage status changes of the drill rod base in real time. When the load on the support point is abnormal or the anchorage fails, it can prompt the staff to take early intervention measures to avoid accidents such as drill rod tilting and borehole wall collapse, thus significantly improving operational safety.

[0012] 2. This solution forms a three-dimensional support system with three sets of radially distributed support rods and bottom fixed anchors, which effectively disperses the reaction force during drilling and grouting. The pointed design of the fixed anchor tip enhances the grip on the fractured rock layer, ensuring the stability of the equipment under complex geological conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 This is a schematic diagram of the oblique structure of this utility model; Figure 4 This is a front view structural diagram of the present utility model; Figure 5 This is a schematic diagram of the structure of this utility model from a bottom view.

[0014] In the diagram: 101, drill rod base; 102, positioning slot; 103, drill rod extension rod; 104, drill bit connection thread; 105, fixed anchor tip; 106, support rod; 107, stress monitor; 108, main rod support cylinder; 109, data wiring; 110, information transmission board; 112, lifting drill rod; 113, lifting groove; 114, support disc; 115, fixed anchor nail; 116, information monitoring board; 117, stress sensor; 118, limit plate; 119, support monitoring cavity. Detailed Implementation

[0015] This utility model provides a stress monitoring drill rod for grouting fractured rock masses, such as... Figure 1-5 As shown, the system includes a drill pipe base 101, a main rod support cylinder 108, a lifting drill pipe 112, and a support disc 114. The support disc 114 is fixedly installed at the top center of the drill pipe base 101. The main rod support cylinder 108 is installed at the top of the support disc 114. The main rod support cylinder 108 has a lifting groove 113 with an opening that extends vertically through the drill pipe. The lower opening of the lifting groove 113 extends through the support disc 114 and the drill pipe base 101. The lifting drill pipe 112 is located within the lifting groove 113 and can move up and down. The drill pipe base 101... The lower end is provided with three outward-facing support monitoring cavities 119. An inclined support rod 106 is fixedly installed inside the support monitoring cavity 119. The support rod 106 is rotatably connected to the support monitoring cavity 119. A stress monitor 107 is installed at the top of the drill rod base 101 and above the support monitoring cavity 119. A limit plate 118 is installed at the top of the support monitoring cavity 119. The limit plate 118 is located above the support rod 106 and abuts against the support rod 106. The detection line of the stress monitor 107 is connected to the limit plate 118.

[0016] It should be further noted that the limiting plate 118 is equipped with a stress sensing plate and is connected to the stress monitor 107 for data transmission.

[0017] Furthermore, the lower end of the lifting drill rod 112 extends downward to below the drill rod base 101 and is fixedly connected to a drill rod extension rod 103. The bottom of the drill rod extension rod 103 is fixedly provided with a drill bit connection thread 104, and the surface of the drill bit connection thread 104 is provided with threads.

[0018] Furthermore, a fixed anchor tip 105 is fixedly provided at the tail end of the support rod 106. The head of the fixed anchor tip 105 is pointed and is used to insert into the working ground to achieve a fixing effect.

[0019] Furthermore, the drill pipe base 101 has a positioning slot 102 with an opening that extends vertically through one side. A fixing anchor 115 can be inserted into the positioning slot 102. A stress sensor 117 is installed inside the fixing anchor 115, and a stress sensing plate is installed inside the stress sensor 117.

[0020] Furthermore, an information monitoring board 116 is mounted on top of the positioning slot 102.

[0021] Furthermore, an information transmission board 110 is fixedly installed on one side of the outer end face of the main rod support cylinder 108. A data wiring 109 is installed and connected to the bottom of the information transmission board 110. The data wiring 109 is connected to the stress monitor 107 and the information monitoring board 116.

[0022] It should be further explained that the information transmission board 110 and the control terminal of the grouting machine are connected via LoRa communication technology.

[0023] When using this solution: S1. Place the drill rod base 101 above the predetermined grouting hole position of the fractured rock mass. The operator inserts the fixing anchor 115 through the positioning slot 102 and hammers it into the stable rock layer at the predetermined depth to achieve the initial anchoring of the drill rod base. The stress sensor 117 in the fixing anchor 115 begins to monitor the stress state of its own anchoring area. The information monitoring board 116 receives and displays the anchoring stress data of the fixing anchor 115 in real time.

[0024] S2. Operate the support rod 106 so that the fixed anchor tip 105 at its tail end extends outward and downward from the support monitoring cavity 119. Insert or hammer the fixed anchor tip 105 into the working ground to form three radially distributed stable support points. At this time, the support rod 106 is subjected to the reaction force from the stratum. The limiting plate 118 abuts against the upper surface of the support rod 106 to limit its excessive rebound or displacement, and transfers the load borne by the support rod 106 to the stress sensing plate in the limiting plate 118. The stress monitor 107 installed at the top of the drill pipe base 101 collects the signal of the stress sensing plate inside the limit plate 118 in real time through the detection line, thereby monitoring the magnitude and change of the load borne by the three support rods 106.

[0025] S3. The drill bit for breaking the rock mass is installed at the bottom of the drill rod extension rod 103 through the drill bit connection thread 104, and the lifting drill rod 112 is driven to move downward in the lifting groove 113 of the main rod support cylinder 108, which drives the drill rod extension rod 103 and the drill bit to drill downward and form a grouting hole in the broken rock mass. During drilling, the main rod support 108 and the drill rod base 101 maintain overall stability through three support rods 106 and fixed anchors 115.

[0026] S4. During drilling and subsequent grouting, the stress monitor 107 continuously monitors the load of the limit plate 118 at the three support points, and the information monitoring plate 116 continuously monitors the anchoring stress of the fixed anchor 115. The aforementioned monitoring data is collected and transmitted via data cable 109 to the information transmission board 110 outside the main pole support cylinder 108; The information transmission board 110 uses LoRa communication technology to wirelessly transmit real-time and multi-point stress monitoring data to the control center of the grouting machine.

[0027] S5. The operator at the grouting machine control center can clearly grasp the overall stability of the drill rod base 101 by receiving real-time data. If the load of a certain support rod 106 increases or decreases significantly, the stratum below the support point may loosen, collapse or have insufficient bearing capacity, which makes it convenient for staff to stop the machine in advance for prevention. If the anchoring stress of the fixed anchor 115 fluctuates abnormally or exceeds the threshold, it may indicate anchoring failure or displacement of deep rock mass. These abnormal data provide operators with early warning signals, indicating the potential risks of drill rod tilting, instability, or grouting hole collapse.

[0028] S6. Once an abnormal stress signal is detected, the operator can take timely measures, such as suspending drilling or grouting, adjusting drilling parameters, reinforcing specific support points or repositioning, and carrying out local grouting to reinforce unstable areas in advance. After confirming the stability of the drill rod or taking reinforcement measures, normal rock grouting operations can be carried out. Throughout the grouting process, the monitoring system works continuously to ensure the safety and quality of the grouting process.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stress monitoring drill rod for grouting in fractured rock mass, comprising a drill rod base (101), a main rod support (108), a lifting drill rod (112), and a support disc (114), characterized in that: The support disc (114) is fixedly installed at the top center of the drill rod base (101). The main rod support cylinder (108) is installed at the top of the support disc (114). The main rod support cylinder (108) has a lifting groove (113) with an opening that runs vertically through it. The opening below the lifting groove (113) runs through the support disc (114) and the drill rod base (101). The lifting drill rod (112) is located in the lifting groove (113). The lower end of the drill rod base (101) has three support monitoring cavities (119) with openings facing outwards. A support rod (106) is fixedly provided inside the cavity (119). The support rod (106) is rotatably connected to the support monitoring cavity (119). A stress monitor (107) is installed at the top of the drill rod base (101) and above the support monitoring cavity (119). A limit plate (118) is installed at the top of the support monitoring cavity (119). The limit plate (118) is located above the support rod (106) and abuts against the support rod (106). The detection line of the stress monitor (107) is connected to the limit plate (118).

2. The stress monitoring drill rod for grouting fractured rock mass according to claim 1, characterized in that: The lower end of the lifting drill rod (112) extends downward to below the drill rod base (101) and is fixedly connected to a drill rod extension rod (103). The bottom of the drill rod extension rod (103) is fixedly provided with a drill bit connection thread (104), and the surface of the drill bit connection thread (104) is provided with threads.

3. The stress monitoring drill rod for grouting fractured rock mass according to claim 1, characterized in that: The tail end of the support rod (106) is fixed with a fixed anchor tip (105), and the head of the fixed anchor tip (105) is pointed.

4. The stress monitoring drill rod for grouting fractured rock mass according to claim 1, characterized in that: The drill pipe base (101) has a positioning slot (102) with an opening that runs vertically through it on one side. A fixing anchor (115) can be inserted into the positioning slot (102). A stress sensor (117) is installed inside the fixing anchor (115). A stress sensing plate is installed inside the stress sensor (117).

5. A stress monitoring drill rod for grouting fractured rock mass according to claim 4, characterized in that: An information monitoring board (116) is installed on top of the positioning slot (102).

6. A stress monitoring drill rod for grouting fractured rock mass according to claim 5, characterized in that: An information transmission board (110) is fixedly provided on one side of the outer end face of the main rod support cylinder (108). A data cable (109) is installed and connected to the bottom of the information transmission board (110). The data cable (109) is connected to the stress monitor (107) and the information monitoring board (116).

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