Device for improving grouting fullness

Abstract

A device for improving grouting fullness comprises a connecting part and a cone part which are connected into a whole, cavities are formed in the connecting part and the cone part, a grout inlet is formed in the end, away from the cone part, of the connecting part and used for being connected with a grout inlet pipe, and a grout outlet pipe is arranged at the end, away from the connecting part, of the cone part and used for being connected with a grout outlet pipe. A plurality of through holes are formed in the conical surface of the cone part. By adopting the device, the section of the device can be effectively utilized to form a barrier, the pipe drawing speed is controlled by acting force generated by grout on the section, the situation that the grout collapses and slips due to too fast pipe drawing is prevented, grout is supplemented to hole positions through the through holes in the cone part, the grouting fullness of the mortar is improved, the anchor rod construction quality evaluation qualification rate or the excellent rate is improved, and the construction efficiency is improved. And the tunnel supporting quality is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of grouting for rock and soil anchor holes, in particular to a device for improving grouting fullness. Background Technique

[0002] As a key construction item for tunnel excavation support, anchor rods can effectively improve the overall stability of newly exposed surrounding rock during excavation. The construction process includes parts such as cement mortar grouting and inserting anchor rods. Among them, cement mortar, as the binder between the anchor rod and the surrounding rock, can effectively ensure that the anchor rod and the surrounding rock form a whole and improve the support effect.

[0003] According to the requirements of current specifications such as the "Non-destructive Testing Regulations for Anchor Rods in Hydropower and Water Conservancy Projects", the fullness of cement mortar filling is the core index for evaluating the construction quality of anchor rods and affects the evaluation results of the construction quality rating of anchor rods. If it is judged as unqualified due to the non-compliance of the fullness, it is necessary to re-drill, and the relevant costs shall be borne by the relevant units themselves. This not only causes repeated work and prolongs the operation time, but also leads to an increase in costs, resulting in an increase in the overall construction cost.

[0004] At present, during construction, generally, a slurry mixing and grouting integrated machine is used to mix the cement mortar and then directly use a rigid plastic pipe as the grouting pipe, insert it to the bottom of the hole, and then pull it out by 50 mm to 100 mm to start grouting. The grouting pipe is slowly and evenly pulled out as the slurry is injected, so that the hole is filled with the slurry. However, in actual operation, during the grouting process of horizontal anchor holes, due to factors such as the pulling-out speed of the pipe, the collapse of the slurry, and the diameter of the grouting pipe, cavities will be generated during the grouting process, resulting in the grouting fullness not meeting the specification requirements. When the "grout first and then insert the rod" process is adopted for the upward inclined hole, during the grouting process, the mortar will collapse downward due to the influence of gravity, also resulting in the grouting fullness not meeting the specification requirements. During the above construction process, there is also a phenomenon: if the pulling-out speed of the grouting pipe is slightly slower than the grouting speed, the slurry will wrap the grouting pipe. Due to the relatively viscous slurry, it may cause the phenomenon that the grouting pipe cannot be pulled out, and there may be waste holes or the need to re-drill and clean, etc., increasing the difficulty of construction operations, prolonging the operation time, and resulting in low quality and low efficiency. Content of the Utility Model

[0005] The purpose of the utility model is to provide a device for improving grouting fullness. By using this device, a barrier can be effectively formed by the cross-section of the device, and the pulling-out speed of the pipe is controlled by the acting force of the slurry on the cross-section, preventing the slurry from collapsing due to too fast pulling-out of the pipe. And the hole position is supplemented with slurry through the through holes on the conical part, so as to improve the fullness of mortar grouting, improve the qualified rate or excellent rate of the construction quality evaluation of anchor rods, and effectively improve the tunnel support quality.

[0006] To achieve the above object, the utility model provides a device for improving the grouting fullness, which includes a connecting part and a conical part. The connecting part and the conical part are connected as a whole. There is a cavity inside the connecting part and the conical part. An inlet for grout is arranged at one end of the connecting part away from the conical part. The inlet for grout is used to connect with the grout inlet pipe. An outlet pipe is arranged at one end of the conical part away from the connecting part. A plurality of through holes are arranged on the conical surface of the conical part.

[0007] The connecting part is also of a conical structure, and the connecting part and the conical part are connected to form a spindle shape.

[0008] The diameter of the inlet for grout is larger than the inner diameter of the outlet pipe.

[0009] The length of the outlet pipe is between 50 mm and 100 mm.

[0010] A notch is arranged at the end of the outlet pipe.

[0011] The connecting part and the conical part are detachably connected.

[0012] A first extension ring is arranged at one end of the connecting part connected to the conical part, and a second extension ring is arranged at one end of the conical part connected to the connecting part. Corresponding threads are arranged on the first extension ring and the second extension ring respectively.

[0013] An extension pipe is arranged at the inlet for grout, and the grout inlet pipe is threadedly connected and fixed to the extension pipe.

[0014] The utility model has the following technical effects compared with the prior art:

[0015] 1. The inlet for grout of the utility model is used to inject grout into the cavity through the grout inlet pipe. Part of the grout in the cavity is injected into the bolt hole from the outlet pipe, and another part of the grout is injected into the bolt hole from the through holes to supplement the grout at the hole position. During application, the maximum outer diameter of the conical part is smaller than the diameter of the bolt hole. During grouting, the grout forms a reaction force on the conical part, so that the device automatically retreats. By using this device, a barrier can be effectively formed by the cross-section of the device, and the pulling-out speed of the pipe can be controlled by the force generated by the grout on the cross-section, preventing the slurry collapse caused by too fast pulling-out of the pipe, and supplementing the grout at the hole position through the through holes on the conical part, so as to improve the fullness of mortar grouting, improve the qualification rate or excellent rate of bolt construction quality evaluation, and effectively improve the tunnel support quality.

[0016] 2. The utility model is provided with a notch at the end of the outlet pipe, which is convenient for the grout to be discharged from the outlet pipe when the outlet pipe abuts against the bottom of the bolt hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0018] Figure 1 This is the overall structural schematic diagram of the present utility model.

[0019] Figure 2 This is the longitudinal sectional structural schematic diagram of the present utility model.

[0020] Figure 3 This is the exploded view of the present utility model.

[0021] In the figure:

[0022] Connecting part 1, first extension ring 11;

[0023] Cone part 2, through hole 21, second extension ring 22;

[0024] Slurry outlet pipe 3, notch 31, slurry inlet 4, cavity 5, slurry inlet pipe 6. Specific implementation manner

[0025] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0026] Please refer to Figures 1-3 , a device for improving the grouting fullness, including a connecting part 1 and a cone part 2. The connecting part 1 and the cone part 2 are connected as a whole. There is a cavity 5 inside the connecting part 1 and the cone part 2. One end of the connecting part 1 far from the cone part 2 is provided with a slurry inlet 4, and the slurry inlet 4 is used to connect with the slurry inlet pipe 6. One end of the cone part 2 far from the connecting part 1 is provided with a slurry outlet pipe 3, and a plurality of through holes 21 are provided on the conical surface of the cone part 2.

[0027] The slurry inlet 4 is used to inject slurry into the cavity 5 through the slurry inlet pipe 6. Part of the slurry in the cavity 5 is injected into the anchor hole through the slurry outlet pipe 3, and the other part of the slurry is injected into the anchor hole through the through holes 21 to supplement the slurry at the hole position. During application, the maximum outer diameter of the cone part 2 is 5 - 10 mm smaller than the diameter of the anchor hole. During grouting, the slurry forms a reaction force on the cone part 2 to make the device automatically retreat. By using this device, a barrier can be effectively formed by the cross-section of the device, and the pulling speed of the pipe can be controlled by the force generated by the slurry on the cross-section to prevent the slurry from collapsing due to too fast pulling of the pipe. And the slurry at the hole position is supplemented through the through holes on the cone part, so as to improve the grouting fullness of the mortar, improve the passing rate or excellent rate of the quality assessment of the anchor construction, and effectively improve the tunnel support quality.

[0028] In a preferred embodiment, the connecting part is also in a cone structure. The connecting part and the cone part are connected to form a spindle shape, and the conical surfaces at the upper and lower ends facilitate the device to be put into the anchor hole and taken out from the anchor hole.

[0029] Specifically, the diameter of the slurry inlet 4 is larger than the inner diameter of the slurry outlet pipe 3.

[0030] Specifically, the length of the slurry outlet pipe 3 is between 50 mm and 100 mm.

[0031] In order to facilitate the discharge of the slurry from the slurry outlet pipe 3 when the slurry outlet pipe 3 abuts against the bottom of the anchor hole, a notch 31 is provided at the end of the slurry outlet pipe 3. As Figure 3 described, 2-4 notches 31 can be provided.

[0032] In order to facilitate the processing and replacement of the conical part 2, the connecting part 1 and the conical part 2 are detachably connected.

[0033] In one embodiment, a first extension ring 11 is provided at one end of the connecting part 1 connected to the conical part 2, and a second extension ring 22 is provided at one end of the conical part 2 connected to the connecting part 1. Corresponding threads are provided on the first extension ring 11 and the second extension ring 22 respectively. Specifically, see Figure 2 , an external thread is provided on the first extension ring 11, and an internal thread is provided on the second extension ring 22.

[0034] The detachable connection between the connecting part 1 and the conical part 2 can be connected by other methods in addition to the above connection method, such as the snap connection of a fire hydrant and a fire hose.

[0035] See Figure 3 , an extension pipe is provided at the slurry inlet 4, and the slurry inlet pipe 6 is screwed and fixed to the extension pipe, which is convenient for connecting the slurry inlet pipe 6 and the slurry inlet 4. In this embodiment, the slurry inlet pipe 6 is made of steel pipe. An external thread is provided at one end of the slurry inlet pipe 6, and an internal thread is provided on the extension pipe. The other end of the slurry inlet pipe 6 is connected to a hose for supplying slurry, and the grouting operation is carried out by holding the slurry inlet pipe 6.

[0036] The working principle or operation process of the present utility model is as follows:

[0037] The conical part 2 of the device is provided with a slurry outlet pipe 3 and a plurality of through holes 21. The slurry outlet pipe 3 is used for grouting the bottom of the hole, and the through holes 21 supplement the slurry in the front slurry outlet pipe 3 to avoid the occurrence of cavities due to slurry collapse.

[0038] Before the grouting work starts, connect the port part of the slurry inlet pipe 6 to the lower slurry inlet 4 of the device, and after the thick slurry flows out of the slurry outlet pipe 3, use the slurry inlet pipe 6 to send the device to the bottom of the hole. There is no need to pull out the grouting pipe by 50 mm to 100 mm before starting grouting, and grouting can be directly carried out to avoid the cavity phenomenon caused by insufficient control of the pipe pulling distance.

[0039] During the grouting process, due to the reaction force generated by the grout on the device, the device can retreat by itself to achieve the effect of pipe extraction. Workers only need to straighten the grout inlet pipe 6, which can achieve a semi-automatic construction effect to a certain extent, ensure the grouting fullness, improve the qualification rate or excellent rate of the bolt construction quality assessment, effectively improve the tunnel support quality, and can also effectively reduce the labor intensity.

Claims

1. A device for improving grouting fullness, characterized in that: The invention comprises a connecting portion (1) and a cone portion (2), wherein the connecting portion (1) and the cone portion (2) are connected as a whole, wherein the connecting portion (1) and the cone portion (2) have cavities (5) inside, wherein the end of the connecting portion (1) away from the cone portion (2) is provided with a pulp inlet (4), wherein the pulp inlet (4) is used to be connected to a pulp inlet pipe (6), wherein the end of the cone portion (2) away from the connecting portion (1) is provided with a pulp outlet pipe (3), and wherein a plurality of through holes (21) are provided on the cone surface of the cone portion (2).

2. A device for improving grouting fullness according to claim 1, characterized in that: The connecting portion (1) is also a cone structure, and the connecting portion (1) and the cone portion (2) are connected to form a spindle shape.

3. A device for improving grouting fullness according to claim 1, characterized in that: The diameter of the pulp inlet (4) is greater than the inner diameter of the pulp outlet pipe (3).

4. A device for improving grouting fullness according to claim 1, characterized in that: The length of the slurry outlet pipe (3) is between 50 mm and 100 mm.

5. The device for improving grouting fullness according to claim 1, characterized in that: The end of the slurry outlet pipe (3) is provided with a notch (31).

6. A device for improving grouting fullness according to claim 1, characterized in that: The connecting portion (1) and the cone portion (2) are detachably connected.

7. The device for improving grouting fullness according to claim 1, characterized in that: One end of the connecting portion (1) connected to the cone portion (2) is provided with a first extension ring (11), and one end of the cone portion (2) connected to the connecting portion (1) is provided with a second extension ring (22), and the first extension ring (11) and the second extension ring (22) are respectively provided with corresponding threads.

8. The device for improving grouting fullness according to claim 1, characterized in that: The slurry inlet (4) is provided with an extension pipe, and the slurry inlet pipe (6) is screwed and fixed to the extension pipe.

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