Auxiliary device for anchor rod grouting and construction method thereof

Abstract

The invention discloses an auxiliary device for anchor rod grouting and a construction method of the auxiliary device, and relates to the field of anchor rod grouting. The transparent hard pipe is wound on the anchor rod, the cap with the hole is arranged at the inner end of the transparent hard pipe, the control ball valve and the vacuum pump are sequentially connected to the outer end of the transparent hard pipe, and the two trays and the fastening nut are sequentially arranged at the outer end of the anchor rod in a sleeving mode. The grouting joint is arranged on the two trays in a penetrating manner; the grouting joint control valve is connected with the grouting joint; a round hole and two oval holes are formed in the tray, the outer end of the transparent hard pipe penetrates out of the tray through the round hole, and the two oval holes are used for allowing the grouting connector to penetrate into the tray. The grouting connector comprises a first connector pipe and two second connector pipes which are communicated with each other, and the two second connector pipes are connected with the two oval holes in the tray in a matched mode respectively. The transparent hard pipe is wound on the anchor rod, it can be guaranteed that the anchor rod is centered and positioned in an anchor hole, and it is guaranteed that a finally-formed mortar protection layer is uniform and effective.

Description

Technical Field

[0001] The invention relates to the field of anchor grouting, and in particular to an auxiliary device for anchor grouting and a construction method thereof. Background Art

[0002] During the construction of underground projects of hydropower stations, the construction of anchor rods is a key process, and the construction of vertical and inclined anchor rods is difficult. Ordinary mortar anchor rods are full-length bonded anchor rods with a very simple structure. During construction, holes are drilled first, and then grouting pipes are inserted. Grouting is performed while withdrawing, and then threaded steel bars are inserted as anchor rods. The length depends on the surrounding rock, and finally they are welded with steel frames or steel grids. Although ordinary anchor rods have simple processes and low costs, they have the following defects:

[0003] 1) When pouring mortar into the anchor hole of the anchor rod, whether the grouting is full is controlled by human factors, and the mortar cannot be guaranteed to be full, thus affecting the anchoring effect;

[0004] 2) For the large elevation angle of the arch, grouting is relatively difficult due to the deadweight of the mortar and the viscosity of the hole wall. After grouting, the mortar in the anchor hole is easy to flow out, and the grouting fullness requirement cannot be met. Not only can the deformation of the surrounding rock be restrained, but also the anchor rod body will be corroded and fail;

[0005] 3) There is a lack of measures to ensure that the anchor rod is centered. Due to the deadweight of the anchor rod and the fluidity of the mortar, when there is an inclination in the anchor hole, the anchor rod in the anchor hole will lean against and cling to one side of the hole wall, and an effective and uniform thickness of the mortar protective layer cannot be guaranteed;

[0006] 4) Since the air in the anchor hole cannot be completely exhausted, there is an illusion that the grouting is full, and it is easy to form a cavity in the anchor hole. The several exhaust holes drilled on the anchor rod body not only have a poor exhaust effect, but also reduce the strength of the rod body. Its actual strength is far lower than the high stress and high strength range of the system anchor rod.

[0007] In summary, due to the above-mentioned defects in the existing technology of anchor grouting, the grouting effect is poor, which makes the anchor force uneven, thereby affecting its stability and support effect. Summary of the invention

[0008] The invention provides an auxiliary device for anchor grouting and a construction method thereof, so as to solve the problem in the prior art that the anchor grouting effect is poor, the anchor is subjected to uneven force, and thus the stability and supporting effect thereof are affected.

[0009] An auxiliary device for anchor grouting of the present invention adopts the following technical scheme: the device comprises: a transparent hard tube wound on the anchor, a cap with holes arranged on the inner end of the transparent hard tube, a control ball valve and a vacuum pump connected to the outer end of the transparent hard tube in sequence, two trays and a fastening nut sequentially sleeved on the outer end of the anchor, a grouting joint penetrated on the two trays, and a grouting joint control valve connected to the grouting joint;

[0010] The tray is provided with a round hole and two oval holes. The outer end of the transparent hard tube passes through the round hole to go out of the tray, and the two oval holes are used for the grouting joint to pass into the tray.

[0011] The grouting joint is a three-way joint, which includes a first joint pipe and two second joint pipes that are connected to each other. The two second joint pipes are arranged in parallel, and the two second joint pipes are perpendicular to the first joint pipe. The first joint pipe is connected to the grouting joint control valve, and the two second joint pipes are respectively adapted to be connected to the two elliptical holes on the tray.

[0012] Preferably, the transparent hard tube is made of TPU or PU material, and the transparent hard tube is fixed to the anchor rod by a cable tie.

[0013] Preferably, the two trays are threaded onto the anchor rod.

[0014] Preferably, the transparent hard tube is wrapped around the anchor rod one or two times.

[0015] Preferably, the one circular hole and the two elliptical holes on the tray are evenly distributed within the diameter range of the outer side of the anchor rod and the anchor hole.

[0016] Preferably, the vacuum pump is a rotary vane vacuum pump.

[0017] Preferably, the outer end of the transparent rigid tube extends out of the tray by 0.5 m to 1.5 m.

[0018] Preferably, the grouting joint control valve is connected to the mortar injection pump.

[0019] Preferably, the outer end of the transparent hard tube is connected to the control ball valve through a socket-type quick connector.

[0020] The construction method of the auxiliary device for anchor grouting of the present invention adopts the following technical scheme: comprising the following steps:

[0021] S1: Process external threads at the tail of the anchor rod, tie and wrap one or two circles of transparent hard tube around the anchor rod, and then fix and connect a cap with holes at one end of the transparent hard tube close to the head of the anchor rod;

[0022] S2: Send the anchor rod wrapped with the transparent hard tube into the anchor hole of the surrounding rock, then thread the two trays and the fastening nut to the outer end of the anchor rod in sequence, then pass the outer ends of the transparent hard tube through the round holes of the two trays at the same time, insert the two second joint pipes of the grouting joint into the two elliptical holes of the two trays at the same time, and finally tighten the fastening nut to make the inner tray close to the outer wall of the surrounding rock;

[0023] S3: Connect the control ball valve and the vacuum pump to the outer end of the transparent hard tube in sequence, connect the grouting joint control valve to the first joint pipe of the grouting joint, and finally connect the control ball valve to the grouting joint;

[0024] S4: Turn on the vacuum pump, open the control ball valve to evacuate the surrounding rock anchor hole through the transparent hard pipe, and at the same time open the grouting joint control valve to grout the anchor hole through the two second joint pipes extending into the anchor hole. During the process, pay attention to the situation in the transparent hard pipe exposed outside the tray. If there is water or mortar and other impurities flowing out of the transparent hard pipe, close the control ball valve in time, and pull out the transparent hard pipe from the control ball valve. If there is a lot of water or mortar and other impurities flowing out of the transparent hard pipe, close the grouting joint control valve in time to end the grouting;

[0025] S5: Loosen the fastening nut appropriately, cut the transparent hard tube between the inner and outer trays, rotate the outer tray to displace the two trays, and then tighten the fastening nut to make the inner tray close to the outer wall of the surrounding rock, thereby closing the anchor hole and completing the grouting and installation of the anchor rod.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, a transparent hard tube is used in combination with a vacuum pump to evacuate the surrounding rock anchor hole, exhaust the air in the surrounding rock anchor hole, and reduce the pressure in the anchor hole at the same time, overcome the gravity of the mortar to a certain extent, and promote the uniform flow of slurry in the anchor hole, thereby ensuring a good grouting effect.

[0028] 2. In the present invention, the transparent hard tube has a transparent property, which makes it easy to observe the water or mortar and impurities in the exposed part of the transparent hard tube, so as to judge whether the grouting is full and stop the grouting at the appropriate node, thereby achieving a good grouting effect.

[0029] 3. In the present invention, the transparent rigid tube has a hard property, and the transparent rigid tube is wrapped around the anchor rod, which can ensure that the anchor rod is centrally positioned in the anchor hole, playing the role of an outer support, avoiding the problem that the anchor rod leans against and clings to the wall of the anchor hole on one side, and the mortar protective layer finally formed is not uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 or the description of the prior art 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.

[0031] Figure 1 It is a schematic structural diagram of the auxiliary device of the present invention.

[0032] Figure 2 It is a schematic structural diagram of a tray of the present invention.

[0033] Figure 3 It is a top view of the grouting joint of the present invention.

[0034] Figure 4 It is the front view of the grouting joint of the present invention.

[0035] Figure 5 It is a side view of the grouting joint of the present invention.

[0036] Description of Reference Numerals

[0037] 1. Anchor rod; 2. Transparent hard pipe; 3. Cap with holes; 4. Control ball valve; 5. Vacuum pump; 6. Tray; 7. Fastening nut; 8. Grouting joint; 9. Grouting joint control valve; 10. Cable tie. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] An embodiment of an auxiliary device for anchor grouting of the present invention is as follows Figures 1 to 5 As shown, the device comprises: a transparent hard tube 2 wound around an anchor rod 1, a cap 3 with holes arranged at the inner end of the transparent hard tube 2, a control ball valve 4 and a vacuum pump 5 connected to the outer end of the transparent hard tube 2 in sequence, two trays 6 and a fastening nut 7 sequentially sleeved on the outer end of the anchor rod 1, a grouting joint 8 penetrated on the two trays 6, and a grouting joint control valve 9 connected to the grouting joint 8;

[0040] The tray 6 is provided with a circular hole and two elliptical holes, the outer end of the transparent hard tube 2 passes through the circular hole to go out of the tray 6, and the two elliptical holes are used for the grouting joint 8 to penetrate into the tray 6;

[0041] The grouting joint 8 is a three-way joint, which includes a first joint pipe and two second joint pipes that are connected to each other. The two second joint pipes are arranged in parallel, and the two second joint pipes are perpendicular to the first joint pipe. The first joint pipe is connected to the grouting joint control valve 9, and the two second joint pipes are respectively adapted to be connected to the two elliptical holes on the tray 6.

[0042] In the present embodiment, it should be noted that there are three considerations for using the transparent rigid tube 2. First, the transparent rigid tube 2 is used for vacuuming, which can exhaust the air in the surrounding rock anchor hole and reduce the pressure in the anchor hole at the same time. It can overcome the gravity of the mortar to a certain extent and promote the uniform flow of the slurry in the anchor hole, thereby achieving a good grouting effect. On the other hand, considering the transparent characteristics of the transparent rigid tube 2, it is convenient to observe the water or mortar and impurities in the exposed part of the transparent rigid tube 2, so as to judge whether the grouting is full and stop the grouting at the appropriate node to achieve a good grouting effect. Secondly, considering the hard characteristics of the transparent rigid tube 2 and the transparent rigid tube 2 wrapped around the anchor rod 1, it can ensure that the anchor rod 1 is centrally positioned in the anchor hole, avoiding the problem that the anchor rod 1 will lean against and cling to one side of the hole wall, resulting in the final mortar protective layer being not uniform.

[0043] In this embodiment, it should be noted that the perforated cap 3 arranged at the inner end of the transparent rigid tube 2 plays a filtering role, reducing the mortar and other debris from being sucked into the transparent rigid tube 2, while ensuring the smooth entry and exit of air.

[0044] In this embodiment, it should be noted that the center of the tray 6 itself has a threaded through hole adapted to the anchor rod 1 with only a small amount of internal threads, and one circular hole and two elliptical holes are three new holes opened in addition to the threaded through hole.

[0045] In this embodiment, the transparent hard tube 2 is made of TPU or PU material, and the transparent hard tube 2 is fixed to the anchor rod 1 by a cable tie 10 .

[0046] In this embodiment, it should be noted that the material of the transparent hard tube 2 can also be PP, PVC, PE, etc.

[0047] In this embodiment, two trays 6 are threadedly connected to the anchor rod 1 .

[0048] In this embodiment, the transparent hard tube 2 is wrapped around the anchor rod 1 for one or two turns.

[0049] In this embodiment, it should be noted that the transparent hard tube 2 is only wound around the anchor rod 1 for a small number of turns to avoid hindering the flow of mortar in the anchor hole.

[0050] In this embodiment, one circular hole and two elliptical holes on the tray 6 are evenly distributed within the diameter range of the outer side of the anchor rod 1 and the anchor hole.

[0051] In this embodiment, it should be noted that one circular hole and two elliptical holes are ensured to be within the diameter range of the anchor hole, that is, the transparent hard tube 2 is ensured to pass through the tray 6 normally, and the grouting joint 2 is normally connected with the anchor hole, thereby grouting.

[0052] In this embodiment, the vacuum pump 5 is a rotary vane vacuum pump.

[0053] In this embodiment, it should be noted that the vacuum pump 5 is a small rotary vane vacuum pump, which is small in size and light in weight, and is convenient for construction and movement in the tunnel.

[0054] In this embodiment, the outer end of the transparent hard tube 2 extends out of the tray 6 by 0.5 m to 1.5 m.

[0055] In this embodiment, it should be noted that a certain length of exposed section of the transparent rigid tube 2 is ensured to facilitate observation of the situation in the transparent rigid tube 2 .

[0056] In this embodiment, the grouting joint control valve 9 is connected to the mortar injection pump.

[0057] In this embodiment, the outer end of the transparent hard tube 2 is connected to the control ball valve 4 via a socket-type quick connector.

[0058] In this embodiment, it should be noted that the use of a socket-type quick connector facilitates the disassembly and assembly of the transparent hard tube 2 and the control ball valve.

[0059] An embodiment of a construction method of an auxiliary device for anchor grouting of the present invention comprises the following steps:

[0060] S1: Process an external thread at the tail of the anchor rod 1, tie and wrap a transparent hard tube 2 around the anchor rod 1 for one or two turns, and then fix and connect a cap 3 with a hole at one end of the transparent hard tube 2 close to the head of the anchor rod 1;

[0061] S2: The anchor rod 1 wrapped with the transparent hard tube 2 is sent into the anchor hole of the surrounding rock, and then the two trays 6 and the fastening nut 7 are threadedly connected to the outer end of the anchor rod 1 in sequence, and then the outer ends of the transparent hard tube 2 are simultaneously passed through the round holes of the two trays 6, and the two second joint pipes of the grouting joint 8 are respectively inserted into the two elliptical holes of the two trays 6 at the same time, and finally the fastening nut 7 is tightened to make the inner tray 6 close to the outer wall of the surrounding rock;

[0062] S3: Connect the outer end of the transparent hard tube 2 to the control ball valve 4 and the vacuum pump 5 in sequence, then connect the first joint pipe of the grouting joint 8 to the grouting joint control valve 9, and finally connect the control ball valve 4 to the grouting joint 8;

[0063] S4: Turn on the vacuum pump 5, open the control ball valve 4 to evacuate the surrounding rock anchor hole through the transparent hard pipe 2, and at the same time open the grouting joint control valve 9 to grout the anchor hole through the two second joint pipes extending into the anchor hole. During the process, pay attention to the situation in the transparent hard pipe 2 exposed outside the tray 6. If there is water or mortar and other impurities flowing out of the transparent hard pipe 2, close the control ball valve 4 in time, and pull out the transparent hard pipe 2 at the control ball valve 4. If there is a lot of water or mortar and other impurities flowing out of the transparent hard pipe 2, close the grouting joint control valve 9 in time to end the grouting;

[0064] S5: Loosen the fastening nut 7 appropriately, cut the transparent hard tube 2 between the inner and outer trays 6, rotate the outer tray 6 to displace the inner and outer trays 6, and then tighten the fastening nut 7 to make the inner tray 6 close to the outer wall of the surrounding rock, thereby closing the anchor hole and completing the grouting and installation of the anchor rod.

[0065] In this embodiment, it should be noted that the control ball valve 4 and the grouting joint 8 are connected together to centralize the devices for easy manual adjustment and control.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An auxiliary device for anchor grouting, characterized in that: The invention comprises a transparent hard tube (2) wound around an anchor rod (1), a cap with a hole (3) arranged at the inner end of the transparent hard tube (2), a control ball valve (4) and a vacuum pump (5) connected to the outer end of the transparent hard tube (2) in sequence, two trays (6) and a fastening nut (7) arranged in sequence on the outer end of the anchor rod (1), a grouting joint (8) inserted through the two trays (6), and a grouting joint control valve (9) connected to the grouting joint (8); The tray (6) is provided with a circular hole and two elliptical holes, the outer end of the transparent hard tube (2) passes through the circular hole to go out of the tray (6), and the two elliptical holes are used for the grouting joints (8) to pass into the tray (6); The grouting joint (8) is a three-way joint, comprising a first joint pipe and two second joint pipes that are connected to each other, the two second joint pipes are arranged in parallel, the two second joint pipes are perpendicular to the first joint pipe, the first joint pipe is connected to the grouting joint control valve (9), and the two second joint pipes are respectively adapted to be connected to the two elliptical holes on the tray (6).

2. The auxiliary device for anchor grouting according to claim 1, characterized in that: The transparent hard tube (2) is made of TPU or PU material, and the transparent hard tube (2) is fixed to the anchor rod (1) via a cable tie (10).

3. The auxiliary device for anchor grouting according to claim 1, characterized in that: The two trays (6) are threadedly connected to the anchor rod (1).

4. The auxiliary device for anchor grouting according to claim 1, characterized in that: The number of turns of the transparent hard tube (2) around the anchor rod (1) is one or two.

5. The auxiliary device for anchor grouting according to claim 1, characterized in that: The circular hole and two elliptical holes on the tray (6) are evenly distributed within the diameter range of the outer side of the anchor rod (1) and the anchor hole.

6. The auxiliary device for anchor grouting according to claim 1, characterized in that: The vacuum pump (5) is a rotary vane vacuum pump.

7. The auxiliary device for anchor grouting according to claim 1, characterized in that: The outer end of the transparent hard tube (2) extends out of the tray (6) by 0.5 m to 1.5 m.

8. The auxiliary device for anchor grouting according to claim 1, characterized in that: The grouting joint control valve (9) is connected to the mortar injection pump.

9. The auxiliary device for anchor grouting according to claim 1, characterized in that: The outer end of the transparent hard tube (2) is connected to a control ball valve (4) via a socket-type quick connector.

10. A construction method of an auxiliary device for anchor grouting according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: processing an external thread at the tail of the anchor rod (1), and tying and wrapping a transparent hard tube (2) around the anchor rod (1) for one or two turns, and then fixing a cap with a hole (3) at one end of the transparent hard tube (2) close to the head of the anchor rod (1); S2: The anchor rod (1) wrapped with the transparent hard tube (2) is inserted into the anchor hole of the surrounding rock, and then the two trays (6) and the fastening nut (7) are threadedly connected to the outer end of the anchor rod (1) in sequence, and then the outer ends of the transparent hard tube (2) are simultaneously passed through the round holes of the two trays (6), and the two second joint pipes of the grouting joint (8) are respectively inserted into the two elliptical holes of the two trays (6), and finally the fastening nut (7) is tightened to make the inner tray (6) close to the outer wall of the surrounding rock; S3: connecting the outer end of the transparent hard tube (2) to the control ball valve (4) and the vacuum pump (5) in sequence, then connecting the first joint pipe of the grouting joint (8) to the grouting joint control valve (9), and finally connecting the control ball valve (4) and the grouting joint (8) together; S4: Start the vacuum pump (5), open the control ball valve (4) to evacuate the surrounding rock anchor hole through the transparent hard pipe (2), and at the same time open the grouting joint control valve (9) to inject grout into the anchor hole through the two second joint pipes extending into the anchor hole. During the process, pay attention to the situation in the transparent hard pipe (2) exposed outside the tray (6). If water or mortar and other impurities flow out of the transparent hard pipe (2), close the control ball valve (4) in time, and pull out the transparent hard pipe (2) from the control ball valve (4). If a large amount of water or mortar and other impurities flow out of the transparent hard pipe (2), close the grouting joint control valve (9) in time to end the grouting. S5: loosen the fastening nut (7) appropriately, cut the transparent hard tube (2) between the inner and outer trays (6), rotate the outer tray (6) to displace the inner and outer trays (6), and then tighten the fastening nut (7) to make the inner tray (6) close to the outer wall of the surrounding rock, thereby closing the anchor hole and completing the grouting and installation of the anchor rod.

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