Method for installing advanced small guide pipe without reinforcing rib

Abstract

The invention belongs to the technical field of tunnel engineering support processing, and particularly relates to a reinforcing-rib-free advanced small guide pipe mounting device which is sequentially composed of a first plugging component, a hoop and a knocking block. The first plugging component is made of a flexible material and is in the shape of a big-end-down circular truncated cone; a through hole used for containing the advanced small catheter is formed in the first plugging component, and the first plugging component is tightly attached to the outer diameter of the advanced small catheter. An annular plate extending outwards is arranged at one end of the hoop, and the annular plate of the hoop is adjacent to the lower bottom of the first plugging component; the knocking block is a round pipe, the inner diameter of the round pipe is larger than the outer diameter of the advanced small guide pipe, one end of the round pipe makes contact with the annular plate of the hoop, and the other end of the round pipe is provided with an annular plate contracting inwards. After the device is used, the drill rod does not make direct contact with the advanced small guide pipe in the knocking process, the main body structure of the advanced small guide pipe is prevented from being damaged, and meanwhile the grouting plugging function is achieved through the first plugging component.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering support processing, and specifically relates to an advanced small conduit installation device without reinforcing ribs. Background Art

[0002] The advance small guide tube is a process method used in the tunnel excavation construction process. It is mainly used for pre-support in weak broken zones with short self-stabilization time, shallow buried sections, portal biased sections, sand layers, gravel sections, fault broken zones and other areas.

[0003] The advance small duct is generally made of seamless steel pipe with a diameter of 38~50mm. The front end of the seamless steel pipe is processed into a cone with a length of about 10cm through a thermoplastic process. The middle part is arranged with overflow holes with a diameter of 6mm in a plum blossom shape. The tail is not less than 30cm long as a grouting stop section without drilling, and reinforcing ribs are set at the end.

[0004] When installing the small conduit, it is necessary to use a pneumatic drill to push the small conduit in, and the tail end of the steel pipe is exposed for a fixed length. The purpose of setting reinforcing ribs at the tail end of the advance small conduit is: first, during the grouting operation, the mortar is injected into the advance small conduit at a pressure of 10 MPa through the grouting equipment, resulting in a great pressure on the wall of the advance small conduit. The reinforcing ribs can significantly improve the rigidity and strength of the advance small conduit itself; secondly, when the advance small conduit is inserted into the working surface, the diameter of the drill hole is larger than the diameter of the advance small conduit by 10-20 mm, which plays a role in plugging the grouting. However, the processing of reinforcing ribs will add additional production processes and add additional costs to the advance small conduit. Moreover, since the reinforcing ribs are rigid structures and cannot fit tightly with the drill hole, the effect of plugging the grouting is not ideal. Summary of the invention

[0005] In view of the problem that the production process of reinforcing ribs for processing an advance small conduit is complicated, the present invention proposes an installation device for an advance small conduit without reinforcing ribs.

[0006] The method for installing a small leading conduit without reinforcing ribs of the present invention is characterized in that: The installation method is based on an installation device, which is composed of a first plugging component, a second plugging component, a hoop and a knocking block in sequence: the first plugging component is made of a flexible material, and its appearance is a truncated cone with a small top and a large bottom. A through hole for accommodating the advanced small catheter is arranged inside the first plugging component, and the first plugging component is tightly fitted with the outer diameter of the advanced small catheter. An annular groove is arranged at the bottom of the first plugging component, and the cross-section of the annular groove is a wedge-shaped with a small top and a large bottom. A corresponding second plugging component is arranged behind the annular groove, and the volume of the second plugging component is slightly larger than the annular groove; an annular plate extending outward is arranged at one end of the hoop, The annular plate is in contact with the second plugging member; when the hoop is struck, the second plugging member is embedded in the annular groove of the first plugging member 1 under the pressure of external force. In order to allow the second plugging member to be fully embedded in the annular groove of the first plugging member, a vertical groove is provided on the outer side of the annular groove of the first plugging member and penetrates to the side of the first plugging member. When the annular groove is squeezed outward, the edge of the first plugging member is deformed and bulged outward to fit the hole wall under construction to avoid leakage; the striking block is a round tube, the inner diameter of the round tube is larger than the outer diameter of the leading small guide tube, one end of the round tube is in contact with the annular plate of the hoop, and the other end of the round tube is provided with an annular plate that shrinks inward; The installation method is as follows: the first plugging component and the second plugging component are sequentially sleeved on the leading small catheter without reinforcing ribs, the clamp is buckled on the tail of the leading small catheter, so that the annular plate on the clamp is adjacent to the lower bottom of the second plugging component; a knocking block is installed behind the clamp, the end of the knocking block is located at the tail of the small catheter, and the annular plate on the knocking block does not contact the leading small catheter. A drill rod is installed on the rock drill, and a protrusion is provided on the drill shoulder of the drill rod; the drill head of the drill rod is inserted into the annular plate of the knocking block, and the protrusion on the drill rod is supported outside the annular plate on the knocking block. When the rock drill is working, the drill rod and the knocking block collide repeatedly, and the clamp drives the leading small catheter to move forward under the impact, and the second plugging component is embedded in the annular groove of the first plugging component under the impact, and the first plugging component is deformed and bulged outward, and fits tightly with the wall of the borehole, and continues to collide until the first plugging component is completely located in the borehole, and the stop grout section of the leading small catheter is located outside the borehole.

[0007] Specifically, the clamp is composed of two parts, an upper part and an lower part, one side of the two parts is hinged, and the other side is locked by a buckle.

[0008] The beneficial effects of the present invention are: First, the advance small catheter is knocked into the borehole through the installation device. During the knocking process, the drill rod does not directly contact the advance small catheter to avoid damage to the main structure of the advance small catheter; secondly, during the knocking process, the first sealing component moves into the borehole to realize the grouting sealing function; finally, during the knocking process, the second sealing component is tightly combined with the first sealing component, so that the first sealing component bulges outward to further enhance the grouting sealing function of the first sealing component.

[0009] Second, the clamp is buckled at the grouting section at the tail of the advance small guide tube, so the length of the advance small guide tube exposed at the face is relatively fixed, the position of the first plugging component in the borehole is relatively fixed with the position of the advance small guide tube, the project has a high degree of standardization, and is convenient for subsequent process development and project quality evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 It is a schematic diagram of the state before the present invention works.

[0012] Figure 3 It is a schematic diagram of the working state of the present invention.

[0013] Figure 4 It is a schematic diagram of the hoop structure of the present invention.

[0014] Figure 5 It is a structural cross-sectional view of the first blocking member and the second blocking member of the present invention.

[0015] Figure 6 It is a structural sectional view of the knocking block of the present invention.

[0016] Among them, there are a first blocking component 1, a second blocking component 2, a clamp 3, a striking block 4, and a drill rod 5. DETAILED DESCRIPTION

[0017] Embodiment 1: The device for installing an advanced small catheter without reinforcing ribs of the present invention is characterized in that the installation device is composed of a first plugging component 1, a second plugging component 2, a hoop 3 and a knocking block 4 in sequence: the first plugging component 1 is made of a flexible material, and its appearance is a truncated cone with a small top and a large bottom. A through hole for accommodating the advanced small catheter is arranged inside the first plugging component 1. The first plugging component 1 fits tightly with the outer diameter of the advanced small catheter. An annular groove is arranged at the bottom of the first plugging component 1. The cross-section of the annular groove is a wedge-shaped with a small top and a large bottom. A corresponding second plugging component 2 is arranged behind the annular groove, and the volume of the second plugging component 2 is slightly larger than the annular groove; one end of the hoop 3 is provided with An outwardly extending annular plate is provided, and the annular plate is in contact with the second plugging member 2; when the hoop 3 is struck, the second plugging member 2 is embedded in the annular groove of the first plugging member 1 under the pressure of external force. In order to allow the second plugging member 2 to be fully embedded in the annular groove of the first plugging member 1, a vertical groove is provided on the outer side of the annular groove of the first plugging member 1 and penetrates to the side of the first plugging member 1. When the annular groove is squeezed outward, the edge of the first plugging member 1 is deformed and bulges outward to fit the hole wall under construction to avoid leakage; the striking block 4 is a round tube, the inner diameter of the round tube is larger than the outer diameter of the advance small guide tube, one end of the round tube is in contact with the annular plate of the hoop 3, and the other end of the round tube is provided with an inwardly contracted annular plate.

[0018] When in use, the first plugging member 1 and the second plugging member 2 are sequentially sleeved on the leading small pipe without reinforcing ribs, and the hoop 3 is buckled on the tail of the leading small pipe so that the annular plate on the hoop 3 is adjacent to the lower bottom of the second plugging member 2; a knocking block 4 is installed behind the hoop 3, the end of the knocking block 4 is located at the tail of the small pipe, and the annular plate on the knocking block 4 does not contact the leading small pipe. A drill rod 5 is installed on the rock drill, and a protrusion is provided on the drill shoulder of the drill rod 5. Insert the drill bit of the drill rod 5 into the annular plate of the striking block 4, and the protrusion on the drill rod 5 is supported outside the annular plate on the striking block 4. When the rock drill is working, the drill rod 5 and the striking block 4 collide repeatedly, and the clamp 3 drives the leading small guide tube to move forward under the collision. The second plugging member 2 is embedded in the annular groove of the first plugging member 1 under the collision. The first plugging member 1 is deformed and bulges outward, fitting tightly with the hole wall of the borehole, and continues to collide until the first plugging member 1 is completely located in the borehole, and the stop grout section of the leading small guide tube is located outside the borehole. After the construction is completed, remove the clamp 3 and the striking block 4.

Claims

1. The method for installing a small advance conduit without reinforcing ribs is characterized by: The installation method is based on an installation device, which is composed of a first plugging component (1), a second plugging component (2), a clamp (3) and a knocking block (4) in sequence: the first plugging component (1) is made of a flexible material, and has an appearance of a truncated cone with a small top and a large bottom; a through hole for accommodating the advanced small catheter is arranged inside the first plugging component (1); the first plugging component (1) is tightly fitted with the outer diameter of the advanced small catheter; an annular groove is arranged at the bottom of the first plugging component (1); the cross section of the annular groove is a wedge shape with a small top and a large bottom; a corresponding second plugging component (2) is arranged behind the annular groove; the volume of the second plugging component (2) is slightly larger The first sealing member (1) is provided with a ring-shaped plate extending outward at one end of the hoop (3), and the ring-shaped plate is in contact with the second blocking member (2); when the hoop (3) is struck, the second blocking member (2) is embedded in the ring-shaped groove of the first blocking member (1) under the pressure of an external force, and a vertical groove penetrating to the side of the first blocking member (1) is provided on the outer side of the ring-shaped groove of the first blocking member (1); when the ring-shaped groove is pressed outward, the edge of the first blocking member (1) is deformed and bulges outward; the striking block (4) is a round tube, the inner diameter of the round tube is larger than the outer diameter of the leading small catheter, one end of the round tube is in contact with the ring-shaped plate of the hoop (3), and the other end of the round tube is provided with a ring-shaped plate contracting inward; The installation method comprises: sequentially sleeve-fitting the first plugging component (1) and the second plugging component (2) onto an advanced small conduit without reinforcing ribs, buckling the clamp (3) onto the tail of the advanced small conduit, so that the annular plate on the clamp (3) is adjacent to the bottom of the second plugging component (2); and installing a knocking block (4) behind the clamp (3), wherein the end of the knocking block (4) is located at the tail of the small conduit, and the annular plate on the knocking block (4) does not contact the advanced small conduit.

2. Install a drill rod (5) on the rock drill, wherein the drill rod (5) has a protrusion on its drill shoulder.

3. Insert the drill bit of the drill rod (5) into the annular plate of the striking block (4), and the protrusion on the drill rod (5) is supported outside the annular plate on the striking block (4). When the rock drill is working, the drill rod (5) and the striking block (4) collide repeatedly, and the clamp (3) drives the leading small guide tube to move forward under the impact. The second plugging component (2) is embedded in the annular groove of the first plugging component (1) under the impact. The first plugging component (1) is deformed and bulges outward, fitting tightly with the wall of the borehole. The impact continues until the first plugging component (1) is completely located in the borehole, and the stop grout section of the leading small guide tube is located outside the borehole.

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