Resin anchoring agent storage and injection device and construction method

Abstract

The invention belongs to the technical field of anchoring agent cartridge anchor rod construction, and particularly relates to a resin anchoring agent storage and injection device and a construction method. The problem that in the original construction process, manual intervention is needed for semi-automatic construction of resin anchoring agent loading and conveying is solved. The resin anchoring agent storage and injection device comprises a storage bin assembly and an anchor rod hole feeding assembly. The storage bin assembly can be used for storing resin anchoring agents with different lengths and diameters, can be used for automatically blanking and returning materials, and is connected into a standby gas source of the anchor rod trolley to realize pipeline conveying of the anchoring agents; according to the anchor rod hole feeding assembly, a conveying pipeline is accurately fed into an anchor rod hole through cooperation of a front-end guide clamp, and near-hole-bottom feeding can be achieved. The resin anchoring agent storage and injection device is additionally arranged on the intelligent anchor rod trolley, so that the automatic loading and conveying function of the anchoring agent is achieved, original semi-automatic construction needing manual intervention is changed into integrated continuous operation of drilling, anchoring agent loading and conveying, anchor rod pushing, prestress applying and grouting, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of anchor rod construction of anchoring agent roll type, and particularly relates to a resin anchoring agent storage and injection device and a construction method. Background Art

[0002] The arch of a tunnel with soft rock geology of level IV and V surrounding rock adopts low prestressed resin coiled anchor rods. The anchor rod model is YR25-5, the nominal diameter of the anchor rod body is 25mm, the wall thickness is 5mm, the borehole diameter is greater than 45mm, and the prestressing force is 60KN. The end uses resin as an anchoring agent, and the cement mortar bonding strength grade between the anchor rod body and the hole wall is not less than M20.

[0003] The current construction has the following problems:

[0004] First, mechanized tunnel construction is becoming more and more popular at this stage. Tunnel anchor trolleys are capable of drilling, pushing anchors, applying prestress and grouting, but do not have the function of loading and delivering resin anchoring agents, which has a certain restriction on the improvement and popularization of large machine operation efficiency;

[0005] Second, the borehole diameter, anchor rod diameter and anchor agent diameter are not coordinated and matched with each other, which has a great impact on the adequacy of anchor agent mixing and the density after solidification, and the reasonable matching of the "three diameters" is not achieved;

[0006] Third, the selection of anchor material, the control of anchor agent stirring speed and time, and the adaptability of grouting slurry ratio are also key factors affecting the quality of anchor construction. Summary of the invention

[0007] In order to solve at least one of the above-mentioned technical problems existing in the prior art, the present invention provides a resin anchoring agent storage and injection device and a construction method.

[0008] The present invention is implemented by the following technical solutions: a resin anchoring agent storage and injection device, with an anchor trolley as a carrier, including a storage bin assembly and an anchor hole feeding assembly;

[0009] Storage bin assembly: It can store resin anchors of different lengths and diameters, automatically discharge and return materials, and realize pipeline transportation of anchors by connecting to the backup air source provided by the anchor trolley;

[0010] Anchor hole feeding assembly: Through the cooperation of the front-end guide clamp, the conveying pipe can be accurately fed into the anchor hole, and feeding near the bottom of the hole can be achieved.

[0011] Preferably, the anchor rod adopts a Ф25mm left-handed non-longitudinal rib threaded steel rod body, and the rotation direction of the anchor rod is opposite to that of the anchor rod trolley.

[0012] Preferably, the method comprises the following steps:

[0013] Connect the resin anchor storage and injection device to the intelligent anchor trolley to automatically load and deliver the resin anchor;

[0014] Match the “three diameters” of the drill hole diameter, the bolt body diameter and the resin anchor diameter;

[0015] Adjust the material of the anchor body, the speed and time control of stirring the resin anchor, and the adaptability of the grouting slurry ratio;

[0016] After the anchoring agent is delivered, the subsequent anchor pushing operation is seamlessly connected, realizing fully automated construction of drilling, installation and injection.

[0017] Preferably, the difference between the drill hole diameter and the anchor rod diameter is 6-10 mm; the difference between the drill hole diameter and the resin anchoring agent diameter is 4-8 mm; and the annular thickness of the resin anchoring agent wrapping around the anchor rod in the hole is 3-4 mm.

[0018] Preferably, the anchor rod body is pushed into the hole to stir the resin anchoring agent at a speed of 300 r / min for 10-15 s; after the resin anchoring agent is stirred, it is left to stand for 1 min and then tensioned with a pre-tightening force.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention realizes the automatic loading and delivery function of the anchor agent by adding a resin anchor agent storage and injection device to the intelligent anchor rod trolley, and optimizes the construction process and improves the construction efficiency from the original semi-automatic construction that requires manual intervention to the integrated continuous operation of drilling, loading and delivering anchor agent, pushing anchor rods, applying prestress, and grouting. It explores the reasonable matching of the "three diameters" in terms of the borehole diameter, the anchor rod body diameter and the anchor agent diameter; optimizes and adjusts the anchor rod body material, the anchor agent stirring speed and time control, and the adaptability of the grouting slurry ratio; in order to improve the construction speed, construction quality and mechanized operation degree of the low prestressed resin coil anchor rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a module schematic diagram of the resin anchoring agent storage and injection device of the present invention. DETAILED DESCRIPTION

[0023] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0025] The present invention provides an embodiment:

[0026] like Figure 1 As shown, a resin anchoring agent storage and injection device uses an anchor trolley as a carrier, and includes a storage bin assembly and an anchor hole feeding assembly;

[0027] Storage bin assembly: It can store resin anchors of different lengths and diameters, and can automatically drop and return materials. It can also realize pipeline transportation of anchors by connecting to the backup air source of the XD20 intelligent anchor trolley.

[0028] Anchor hole feeding assembly: Through the cooperation of the front-end guide clamp, the conveying pipe can be accurately fed into the anchor hole, and feeding near the bottom of the hole can be achieved.

[0029] A resin anchoring agent storage spraying construction method comprises the following steps:

[0030] Connect the resin anchor storage and injection device to the intelligent anchor trolley to automatically load and deliver the resin anchor;

[0031] Match the “three diameters” of the drill hole diameter, the bolt body diameter and the resin anchor diameter;

[0032] Adjust the material of the anchor body, the speed and time control of stirring the resin anchor, and the adaptability of the grouting slurry ratio;

[0033] After the anchoring agent is delivered, the subsequent anchor pushing operation is seamlessly connected, realizing fully automated construction of drilling, installation and injection.

[0034] Specifically, the "three diameters" of the borehole diameter, the bolt body diameter and the drug coil diameter are reasonably matched:

[0035] In order to improve the density and anchoring force of the resin anchor after mixing, the borehole diameter, anchor rod diameter and anchor agent diameter should be reasonably matched. When the borehole diameter is too large, the drilling time and cost will be increased, and the anchor rod body cannot effectively pierce the resin roll and evenly mix the anchor agent, resulting in reduced density and anchoring force, and more resin anchor agents are required, resulting in excessive costs. When the borehole diameter is too small, the resin mastic and curing agent lack mixing space and cannot be fully and evenly mixed and consolidated, resulting in reduced density and anchoring force. After repeated tests, it is generally concluded that the difference between the borehole diameter and the anchor rod diameter is 6 to 10 mm; the difference between the borehole diameter and the resin anchor agent diameter is 4 to 8 mm. When the annular thickness of the resin anchor wrapped around the anchor rod in the hole is 3 to 4 mm, the anchor rod is relatively easy to install and the anchoring force is relatively large. Combined with the actual situation of on-site equipment, anchor rods and resin anchor agents, the selected "three diameters" matching is shown in Table 1:

[0036] Table 1 "Three-path" matching details

[0037]

[0038] Anchor material selection, stirring coil speed and time control:

[0039] The anchor rod adopts Ф25mm left-handed threaded steel rod without longitudinal ribs (compared with construction threaded steel anchor rods with longitudinal ribs, it can reduce the gap between the anchor rod body and the resin anchor caused by the rotation of the longitudinal ribs). The rotation direction of the anchor rod is opposite to that of the anchor rod trolley, which is beneficial to improve the density of the stirred resin anchor.

[0040] Strictly control the mixing time of the resin anchor. Neither insufficient mixing nor excessive mixing, let alone multiple mixing, is allowed. When installing the anchor, push and stir at the same time to avoid the glove effect and the formation of a loose sleeve between the resin anchor and the anchor body. According to the summary of the field test, the speed of the resin anchor when the anchor body is pushed into the hole should be controlled at 300r / min, and the time should be controlled at 10-15s. After the resin anchor is stirred, let it stand for 1 minute and then tension the preload.

[0041] Adaptability of grouting slurry ratio:

[0042] When the original "grouting slurry water-cement ratio is controlled between 0.35 and 0.45, and the grouting pressure is controlled between 0.1 and 0.5 MPa" was used for construction, after the grouting was completed, the slurry continued to overflow at the hole mouth, and the remaining slurry in the hole partially penetrated and consolidated the surrounding rock, resulting in too low grouting density. After continuous on-site tests combined with the performance of the anchor trolley grouting system, the slurry water-cement ratio (water: micro-expansion grouting material) was adjusted to 0.35, and the overflow at the hole mouth was controlled. After the grouting was completed, a small amount of slurry was lost at the hole mouth, and the slurry could be well retained in the hole, with a high grouting density.

[0043] The invention forms the low prestressed resin coil anchor rapid construction and quality control technology through the improvement of the "anchor trolley resin anchor storage and injection device" tooling, the reasonable matching of the "three diameters" of the drilling diameter, the anchor body diameter and the resin anchor diameter; the improvement of the anchor body material, the speed and time control of the stirring resin anchor, the adaptability of the grouting slurry ratio and other process adjustments. The anchor construction efficiency, construction quality and large machine utilization rate have been significantly improved.

[0044] Through the application of low prestressed resin rolled anchor bolts in the arch of the No. 5 horizontal tunnel, the average time for installing a single anchor bolt is 5.9 minutes (10.6 minutes shorter than the conventional manual charging time of 16.5 minutes). Taking the single cycle footage of 2.4m in the IV grade surrounding rock as an example, a total of 13 anchor bolts were installed, and the average time per cycle was 1.3 hours, as shown in Table 2:

[0045] Table 2 Comparison of the time used for each link of a single low prestressed resin coil hollow grouting anchor

[0046]

[0047] (2) This technology can also be applied to the construction of cement-coated anchor bolts for the side walls of the IV and V grade surrounding rocks. The average construction time for a single anchor bolt is 4.2 minutes (4.8 minutes shorter than the 9 minutes for conventional manual charging). Taking the IV grade surrounding rock with a single cycle of 2.4 m as an example, a total of 16 anchor bolts were constructed, and the average construction time for each cycle was 1.1 hours, as shown in Table 3:

[0048] Table 3 Comparison of the time used for each link of a single cement coil anchor

[0049]

[0050] (3) In summary, taking the single cycle advance of 2.4 m in the IV grade surrounding rock as an example, a total of 39 anchor rods were installed, and the average time per cycle was 2.4 h, which was 3.6 h shorter than the conventional pre-adjustment plan and the manual charging time of 6 h.

[0051] The beneficial effects of the present invention include:

[0052] (1) The new "automatic charging" tooling has high construction efficiency. A resin anchor storage and injection device has been added to the original equipment of the XD20 intelligent anchor trolley, realizing the seamless connection of drilling, loading (loading anchoring agent, loading anchors), and injection.

[0053] (2) The large machine operation is highly complete and the safety risk is low. After adding the resin anchor storage and injection device, the problem of semi-automatic construction that required manual intervention in the loading and delivery of the resin anchor was solved, the completeness of the large machine construction was improved, and the labor force was further liberated, thereby reducing the safety risk.

[0054] (3) The three diameters of the drill hole, the bolt body and the resin anchor are reasonably matched, which ensures sufficient mixing of the anchor and the annular thickness after solidification in the bolt hole space, significantly improving the quality.

[0055] (4) By improving the anchor rod material and optimizing the rotation speed and time during the mixing process of the resin anchor agent, the sufficiency and uniformity of the anchor agent mixing are ensured in the process, and the quality control is good.

[0056] The present invention is suitable for the construction of anchor rods with anchoring agent rolls in railway and highway tunnels and mines with low prestress. It also brings the following economic and social benefits:

[0057] (1) Economic benefits: Taking the single-cycle advance of 2.4 m in Grade IV surrounding rock as an example, through the application of this anchor bolt rapid construction technology, the average single-cycle tunnel excavation time is shortened by 3.6 h. Based on 45 cycles per month (2 days / 3 cycles) for a single face, the average single face excavation time is shortened by 162 h per month, creating an economic benefit of approximately RMB 388,000.

[0058] (2) Social benefits: This anchor rapid construction technology studies the automatic charging system of the "anchor trolley resin anchor storage and injection device", which realizes the truly integrated continuous operation of drilling, loading and delivering drug rolls, pushing anchors, applying prestress and grouting for domestic anchor trolleys. It improves construction efficiency, reduces the safety risks of manual charging, improves the perfection of large-scale tunnel operations, and promotes the mechanization and popularization of all tunnel operations, with significant social benefits.

[0059] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A resin anchoring agent storage and injection device, using an anchor trolley as a carrier, characterized in that: It includes a storage bin assembly and an anchor hole feeding assembly; Storage bin assembly: It can store resin anchors of different lengths and diameters, automatically discharge and return materials, and realize pipeline transportation of anchors by connecting to the backup air source provided by the anchor trolley; Anchor hole feeding assembly: Through the cooperation of the front-end guide clamp, the conveying pipe can be accurately fed into the anchor hole, and feeding near the bottom of the hole can be achieved.

2. A resin anchoring agent storage and injection device according to claim 1, characterized in that: The anchor rod adopts Ф25mm left-handed non-longitudinal rib threaded steel rod body, and the rotation direction of the anchor rod is opposite to that of the anchor rod trolley.

3. A resin anchoring agent storage and spraying construction method, relying on the resin anchoring agent storage and spraying device according to claim 1 or 2, characterized in that: The following steps are involved: Connect the resin anchor storage and injection device to the intelligent anchor trolley to automatically load and deliver the resin anchor; Match the "three diameters" of the drill hole diameter, the bolt body diameter and the resin anchor diameter; Adjust the material of the anchor body, the speed and time control of stirring the resin anchor, and the adaptability of the grouting slurry ratio; After the anchoring agent is delivered, the subsequent anchor pushing operation is seamlessly connected, realizing fully automated construction of drilling, installation and injection.

4. A resin anchoring agent storage spraying construction method according to claim 3, characterized in that: The difference between the drill hole diameter and the anchor rod diameter is 6-10mm; the difference between the drill hole diameter and the resin anchoring agent diameter is 4-8mm; the annular thickness of the resin anchoring agent wrapping around the anchor rod in the hole is 3-4mm.

5. A resin anchoring agent storage spraying construction method according to claim 3, characterized in that: The anchor rod body is pushed into the hole and the resin anchor is stirred at a speed of 300r / min for 10-15s. After the resin anchor is stirred, it is left to stand for 1min and then the pre-tightening force is applied.

Images