Vertical shaft ground pre-grouting collapse hole feeding device

Abstract

The utility model discloses a vertical shaft ground pre-grouting collapse hole feeding device which comprises a grouting hole and a reinforcement cage, the reinforcement cage is inserted into the hole wall of the grouting hole and is in clearance fit with the grouting hole, semicircular pipes are inserted into the inner wall of the reinforcement cage, the number of the semicircular pipes is two, the semicircular pipes are symmetrically arranged, and the upper surfaces of the semicircular pipes are fixedly connected with top hoisting rings. The circular pipe is fully attached to the hole wall of a grouting hole, then grouting work is conducted on a reinforcement cage, after grouting is solidified, the circular pipe is pulled out through hoisting, a broken zone can be densely filled, the strength and stability of the ground are improved, a better foundation is provided for shaft construction, and the safety risks such as hole collapse are reduced; and the grouting holes are shaped through the reinforcement cage, so that subsequent feeding work is also facilitated.

Description

Technical Field

[0001] This utility model relates to the field of grouting technology in fracture zones, specifically to a pre-grouting and hole-crushing feeding device for vertical shafts. Background Art

[0002] Pre-grouting of the shaft surface is a method of reinforcing the wellhead by pre-grouting the surface. It is primarily used when the well casing passes through loose strata or aquifers to prevent well casing subsidence or water seepage. By pre-grouting the wellhead surface, the surrounding strata can be reinforced, improving their strength and stability, thereby ensuring the safety and quality of well casing construction. Pre-grouting of the shaft surface is an effective reinforcement method.

[0003] When pre-grouting of vertical shafts encounters fractured surfaces, severe borehole collapse often occurs. This collapse prevents the grout from fully penetrating and diffusing within the fractured zone, failing to achieve the desired reinforcement effect. This can affect the stability and safety of the shaft, causing the grouting to fail to meet completion criteria. Re-grouting or other repair measures may be necessary, increasing costs and time. Therefore, we propose a borehole-feeding device for pre-grouting of vertical shafts to ensure the desired reinforcement effect is achieved. Utility Model Content

[0004] The purpose of this invention is to provide a pre-grouting and hole-collapse feeding device for vertical shafts to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pre-grouting and hole-collapse feeding device for vertical shafts, comprising a grouting hole and a reinforcing cage, wherein the reinforcing cage is inserted into the hole wall of the grouting hole with clearance fit, and a semi-circular tube is inserted into the inner wall of the reinforcing cage, wherein there are two semi-circular tubes arranged symmetrically, and a top lifting ring is fixedly connected to the upper surface of the semi-circular tube.

[0006] Preferably, a sleeve is provided on the upper surface of the grouting hole, and a support structure is symmetrically provided on the inner annular wall of the sleeve, with the other end of the support structure fitting against the side wall of the semi-circular tube.

[0007] Preferably, the support structure includes a bidirectional screw, the outer wall of which is symmetrically threaded with an internal thread rod, and the end of the internal thread rod is fixedly connected with a circular block. The outer wall of the circular block on one side is engaged with the side wall of the semi-circular tube, and the outer wall of the circular block on the other side is engaged with the side wall of the sleeve tube.

[0008] Preferably, the side walls of the sleeve are symmetrically fixedly connected with side lifting rings.

[0009] Preferably, the inner cavity of the semi-circular tube is hollow.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: When the pre-grouting work is carried out on the surface of the vertical shaft, a semi-circular tube is first inserted into the grouting hole. The semi-circular tubes are symmetrically arranged and combined to form a complete circular tube. The inside is also hollow, which facilitates the hoisting work. The specification of the semi-circular tube is smaller than the diameter of the grouting hole and will not fit with the inside of the grouting hole. Then, the steel cage is fitted onto the outer wall of the circular tube and slid down to fully fit with the hole wall of the grouting hole. Then, grouting work is carried out at the steel cage. After the grouting solidifies, the circular tube is pulled out by hoisting. This can fill the broken zone densely, improve the strength and stability of the ground, provide a better foundation for shaft construction, and reduce safety risks such as hole collapse. Moreover, after the semi-circular tube is pulled out, the grouting hole is shaped by the steel cage, which also facilitates the subsequent feeding work. Attached Figure Description

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] Figure 2 for Figure 1 3D detail of the middle semi-circular tube;

[0013] Figure 3 for Figure 1 3D detailed view of the central support structure;

[0014] Figure 4 for Figure 1 A three-dimensional sectional view of the middle sleeve tube;

[0015] In the diagram: 1. Reinforcing cage; 2. Semicircular pipe; 3. Top lifting ring; 4. Sleeve pipe; 5. Support structure; 51. Two-way screw; 52. Internal threaded rod; 53. Circular block; 6. Side lifting ring. DETAILED DESCRIPTION

[0016] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0017] Please see Figure 1-4 This utility model provides a pre-grouting and hole-crushing feeding device for vertical shafts, including a grouting hole and a reinforcing cage 1. The reinforcing cage 1 is inserted into the hole wall of the grouting hole and is in clearance fit. A semi-circular tube 2 is inserted into the inner wall of the reinforcing cage 1. There are two semi-circular tubes 2, which are symmetrically arranged. A top lifting ring 3 is fixedly connected to the upper surface of the semi-circular tube 2.

[0018] A sleeve 4 is provided on the upper surface of the grouting hole. A support structure 5 is symmetrically provided on the inner ring wall of the sleeve 4, and the other end of the support structure 5 is attached to the side wall of the semi-circular pipe 2.

[0019] The support structure 5 includes a bidirectional screw 51, and the outer wall of the bidirectional screw 51 is symmetrically threaded with an internal thread rod 52. The end of the internal thread rod 52 is fixedly connected with a round block 53. The outer wall of one round block 53 is engaged with the side wall of the semi-circular tube 2, and the outer wall of the other round block 53 is engaged with the side wall of the sleeve tube 4.

[0020] The side walls of the sleeve 4 are symmetrically fixed with side lifting rings 6.

[0021] The inner cavity of the semi-circular tube 2 is hollow.

[0022] Working principle: Before the pre-grouting work on the surface of the vertical shaft, drilling is carried out in advance in the fracture zone. Then, the semi-circular pipe 2 is inserted into the grouting hole. The semi-circular pipe 2 is hoisted by the top lifting ring 3. The interior of the semi-circular pipe 2 is hollow, and the semi-circular pipes 2 are symmetrically arranged. After assembly, they form a complete circular pipe. The size of the semi-circular pipe 2 will be smaller than the diameter of the grouting hole and will not fit tightly with the interior of the grouting hole. Then, the steel cage 1 is fitted onto the outer wall of the semi-circular pipe 2 and slid down to fully fit with the wall of the grouting hole. Then, grouting work is carried out at the steel cage 1. During the grouting process, the pressure should not be too high, the water pressure time should be short, and the grouting parameters should be low pressure, small volume, thick grout, and appropriately increased. By increasing the number of grouting cycles, the grouting pressure is gradually increased to the final pressure standard. Then, the movable sleeve pipe 4 is hoisted by the side lifting ring 6 and placed on the outer wall of the semi-circular pipe 2 for post-construction enclosure work. At the same time, the support structure 5 is used for support. By rotating the internal thread rods 52 on both sides and moving them on the outer wall of the bidirectional screw 51, the circular blocks 53 on both sides are respectively attached to the grooves of the semi-circular pipe 2 and the sleeve pipe 4 for support, ensuring the stability of the semi-circular pipe 2 in the grouting hole. After the grout solidifies, the semi-circular pipe 2 is pulled out by the top lifting ring 3, leaving the steel cage 1 in the grouting hole, completing the pre-grouting of the vertical shaft surface, improving its strength and stability, thereby ensuring the construction safety and project quality of the shaft.

[0023] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pre-grouting and hole-collapse feeding device for vertical shafts, characterized in that: It includes a grouting hole and a reinforcing cage (1). The reinforcing cage (1) is inserted into the wall of the grouting hole and is in clearance fit. A semi-circular tube (2) is inserted into the inner wall of the reinforcing cage (1). There are two semi-circular tubes (2) and they are arranged symmetrically. A top lifting ring (3) is fixedly connected to the upper surface of the semi-circular tube (2).

2. The vertical shaft surface pre-grouting and hole-collapse feeding device according to claim 1, characterized in that: A sleeve (4) is provided on the upper surface of the grouting hole. A support structure (5) is symmetrically provided on the inner ring wall of the sleeve (4), and the other end of the support structure (5) is attached to the side wall of the semi-circular pipe (2).

3. The vertical shaft surface pre-grouting and hole-collapse feeding device according to claim 2, characterized in that: The support structure (5) includes a bidirectional screw (51), the outer wall of which is symmetrically threaded with an internal thread rod (52), and the end of the internal thread rod (52) is fixedly connected with a round block (53). The outer wall of the round block (53) on one side is engaged with the side wall of the semi-circular tube (2), and the outer wall of the round block (53) on the other side is engaged with the side wall of the sleeve tube (4).

4. A pre-grouting and hole-collapse feeding device for vertical shafts according to claim 2, characterized in that: The sleeve (4) is symmetrically and fixedly connected to the side wall with side lifting rings (6).

5. A pre-grouting and hole-collapse feeding device for vertical shafts according to claim 1, characterized in that: The inner cavity of the semi-circular tube (2) is hollow.

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