Grouting reinforcement device for door opening engineering

Abstract

The invention relates to the field of freezing construction, and particularly discloses a grouting reinforcement device for door opening engineering, which realizes quick erection of a grouting pipe through a port pipe and a fixer, replaces a mode of laying the grouting pipe through secondary drilling, is simple to operate, saves the construction period, and is matched with clay particles filled between the grouting pipe and the inner wall of a freezing hole, so that the construction efficiency is improved. Filling and supporting of freezing holes and limiting and fixing of grouting pipes are achieved, thaw collapse of the freezing holes and frozen soil layers is reduced, the safety during shield excavation is improved, operation is easy, and the pressure maintaining effect is good; meanwhile, by arranging a sealing thin pipe provided with a one-way valve and a sealing sleeve fixedly connected to the opening position of the port pipe in a sleeving mode, sealing pressure maintaining of the grouting pipe and the port pipe is achieved, the water and soil pressure at the freezing hole is balanced, and the pressure maintaining effect is further improved; in addition, through the one-way valve arranged in the sealing thin pipe, sealing and pressure maintaining during shield operation are facilitated, and meanwhile one-way injection of mortar is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of freezing construction, and more particularly to a grouting reinforcement device for door opening engineering. Background Art

[0002] Artificial ground freezing technology has been increasingly improved through long-term engineering practice. To address the problem of tunnel portal stability control under complex geological conditions, this technology effectively reinforces the surrounding soil by constructing a continuous freezing curtain, providing reliable protection for the shield machine to safely break through the tunnel portal.

[0003] However, technical bottlenecks remain in the connection between freezing construction and the shield receiving process: the current mainstream steel sleeve receiving system is limited by its airtight construction characteristics. As a result, the vertical frozen holes can only be sealed with passive filling materials after extraction, making it difficult to implement the process design of pre-buried grouting pipelines. This technical limitation makes it difficult to implement active compensatory grouting during the thawing period of the frozen wall. If the ground deformation and post-construction settlement need to be controlled, secondary ground drilling and post-grouting operations must be carried out, which significantly increases construction costs and extends the construction period at critical nodes. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a grouting reinforcement device for doorway engineering, which can realize the rapid pre-embedding and installation of grouting pipes.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A grouting reinforcement device for door opening engineering includes a port pipe clamped at the upper opening position of a freezing hole, a grouting pipe inserted into the freezing hole is provided at the central axis position of the port pipe, and the grouting pipe is fixedly connected to the inner wall of the port pipe through a fixer; a sealing capillary is inserted into the upper end of the grouting pipe, a sealing sleeve is fixedly connected to the outer side of the sealing capillary, and the sealing sleeve is fixedly sleeved at the upper opening of the port pipe; a one-way valve is fixedly connected inside the sealing capillary.

[0007] Compared with the prior art, the advantages of the present invention are: (1) The present invention realizes the rapid installation of grouting pipes through the port pipe and the fixer, replacing the secondary drilling method for laying grouting pipes. The operation is simple and the construction period is saved. Clay particles are filled between the grouting pipe and the inner wall of the freezing hole to achieve the filling support of the freezing hole and the limiting fixation of the grouting pipe, thereby reducing the thawing settlement of the freezing hole and the frozen soil layer, improving the safety during shield excavation, and the operation is simple and the pressure maintenance effect is good.

[0008] (2) The present invention realizes sealing and pressure maintenance of the grouting pipe and the port pipe by providing a sealing capillary tube equipped with a one-way valve and a sealing sleeve fixedly sleeved at the opening of the port pipe, balancing the water and soil pressure at the freezing hole, and further improving the pressure maintenance effect; in addition, the one-way valve provided in the sealing capillary tube facilitates sealing and pressure maintenance during shield operation, and facilitates one-way injection of mortar.

[0009] (3) The present invention provides a pressure gauge fixedly connected to the upper opening of the sealing capillary tube, which cooperates with the one-way valve to provide two-stage sealing for the sealing capillary tube, thereby further improving the sealing and pressure-maintaining effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle; Figure 4 This is a schematic diagram of the explosion assembly structure of the present invention; Figure 5 This is a schematic diagram of the present invention installed in a freezing hole.

[0011] Explanation of the numbers in the figure: 1. Port pipe; 101. Loading ring; 2. Grouting pipe; 3. Fixer; 301. Guide ring; 302. Fixing rod; 4. Sealing capillary; 5. Sealing sleeve; 501. Inner raised ring; 6. One-way valve; 601. Cylinder; 602. Valve core; 603. Piston rod; 604. Fixing cylinder; 605. Spring; 606. Radial rod; 7. Pressure gauge; 8. First sealing ring; 9. Second sealing ring. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] See also Figure 1-5In one embodiment of the present invention, a grouting reinforcement device for door opening engineering includes a port pipe 1 clamped at the upper opening position of the freezing hole, a grouting pipe 2 inserted into the freezing hole is provided at the central axis position of the port pipe 1, and the grouting pipe 2 is fixedly connected to the inner wall of the port pipe 1 through a fixture 3; a sealing capillary 4 is inserted into the upper end of the grouting pipe 2, a sealing sleeve 5 is fixedly connected to the outside of the sealing capillary 4, and the sealing sleeve 5 is fixedly sleeved at the upper opening of the port pipe 1; a one-way valve 6 is fixedly connected inside the sealing capillary 4.

[0014] For details, please refer to Figure 5 , when used, includes the following steps: Step 1: Before shield excavation, pull out the freezing pipe in the freezing hole; Step 2: insert the port pipe 1 into the upper opening of the freezing hole; Step 3: Place the grouting pipe 2 into the freezing hole and use the fixer 3 to fix the grouting pipe 2 at the center axis position of the freezing hole; Step 4: Fill the freezing hole with clay particles; Specifically, the clay particles are filled in the freezing hole to a height of 3-5 meters from the top to the shield excavation area; Step 5: insert the sealing capillary tube 4 into the grouting pipe 2 and securely sleeve the sealing sleeve 5 onto the upper opening of the port pipe 1; Step six, perform shield excavation operation. After the shield excavation is completed, grouting is performed into the grouting pipe 2 through the sealed capillary 4.

[0015] Specifically, the position of the grouting pipe 2 is fixed by setting the port pipe 1 and the fixer 3, and the grouting pipe 2 is pre-buried by filling clay particles between the grouting pipe 2 and the inner wall of the freezing hole to ensure the pressure in the freezing hole, which is convenient for subsequent shield excavation operations. The port pipe 1 is sealed by the sealing sleeve 5, and the grouting pipe 2 is sealed by the sealing capillary 4 equipped with a one-way valve 6, thereby achieving sealing and pressure maintenance of the freezing hole, so that the pressure in the freezing hole is stable during shield excavation operations, reducing the thawing settlement of the freezing hole and the frozen soil layer. During grouting, the one-way valve 6 in the sealing capillary 4 is squeezed open by the mortar, which is convenient for grouting operations.

[0016] Compared with the traditional reinforcement method of open-hole grouting, the present invention realizes the rapid installation of the grouting pipe 2 through the port pipe 1 and the fixer 3, and cooperates with the filling of clay particles between the grouting pipe 2 and the inner wall of the freezing hole to realize the filling support of the freezing hole and the limiting fixation of the grouting pipe 2, reduce the thawing settlement of the freezing hole and the frozen soil layer, improve the safety during shield excavation, simple operation, and good pressure maintenance effect; at the same time, by providing a sealing capillary 4 with a one-way valve 6 and a sealing sleeve 5 fixedly sleeved on the opening position of the port pipe 1, the grouting pipe 2 and the port pipe 1 are sealed and pressure maintained, further improving the pressure maintenance effect; in addition, the one-way valve 6 arranged in the sealing capillary 4 facilitates sealing and pressure maintenance during shield operation, and facilitates the one-way injection of mortar.

[0017] See also Figure 4 The fixer 3 includes a guide ring 301 and fixing rods 302 fixed on the outside of the guide ring 301 and distributed equidistantly around the circumference. The guide ring 301 is fixedly connected to the grouting pipe 2 by bolts, and the outer end of the fixing rod 302 slides against the inner wall of the port pipe 1.

[0018] Specifically, by fixing the fixture 3 on the upper part of the grouting pipe 2, when installing the grouting pipe 2, the grouting pipe 2 and the fixture 3 are directly placed into the port pipe 1 and slid vertically downward. The operation is simple and the installation is convenient. At the same time, when disassembling, the fixture 3 and the grouting pipe 2 can be directly lifted.

[0019] See also Figure 3 The one-way valve 6 includes a cylinder 601 fixedly connected to the inner wall of the sealing tube 4, a valve core 602 slidably connected to the lower part of the cylinder 601 is nested, the upper end of the valve core 602 is fixedly connected to the piston rod 603, the upper end of the piston rod 603 is slidably sleeved with a fixed cylinder 604, a spring 605 abutting against the upper end of the piston rod 603 is provided in the fixed cylinder 604, and the upper end of the fixed cylinder 604 is fixedly connected to a radial rod 606 fixedly connected to the inner wall of the cylinder 601.

[0020] Specifically, when the valve core 602 is not subjected to external force, the spring 605 squeezes and limits the piston rod 603 , and the piston rod 603 drives the valve core 602 to be sealed at the lower end of the cylinder 601 .

[0021] See also Figure 3 The radial rod 606 is a strip rod with a triangular cross section and its tip faces upward.

[0022] Specifically, by providing the radial rod 606 with a triangular cross section, the obstruction of the mortar during grouting is reduced.

[0023] See also Figure 2 The port pipe 1 is a vertical circular tubular structure. A carrying ring 101 is fixedly connected to the middle of the circumferential outer wall of the port pipe 1, and the carrying ring 101 is in contact with the ground.

[0024] Specifically, the port tube 1 is limited by the carrying ring 101 and the carrying stability of the port tube 1 is improved.

[0025] See also Figure 2 The sealing sleeve 5 is a cylindrical structure with an open lower end. The sealing tube 4 passes through the sealing sleeve 5 and is integrally formed therewith. The sealing sleeve 5 is threadedly connected to the port tube 1.

[0026] Specifically, the integrally formed sealing tube 4 and sealing sleeve 5 have good sealing performance, and the threaded connection between the sealing sleeve 5 and the port tube 1 is convenient for installation and disassembly.

[0027] In another embodiment of the present invention, a pressure gauge 7 is fixedly connected to the upper opening of the sealed capillary tube 4 .

[0028] Specifically, during shield excavation operations, when the one-way valve 6 is damaged and leaks, the air pressure in the grouting pipe 2 is monitored in real time through the pressure gauge 7. At the same time, the pressure gauge 7 replaces the one-way valve 6 to seal the sealing capillary 4 and the grouting pipe 2.

[0029] See also Figure 3 and Figure 4 A plurality of first sealing rings 8 are fixedly sleeved on the outer wall of the lower end of the sealing tube 4 , and the first sealing rings 8 are interference fit with the inner wall of the grouting pipe 2 .

[0030] Specifically, the first sealing ring 8 is used to improve the sealing performance at the interface between the sealing capillary 4 and the grouting pipe 2, thereby improving the sealing and pressure-maintaining effect.

[0031] See also Figure 2 An inner raised ring 501 is fixedly connected to the inner side of the sealing sleeve 5, and an annular groove is formed between the inner raised ring 501 and the outer wall of the sealing sleeve 5. A second sealing ring 9 is nested in the annular groove, and the second sealing ring 9 abuts against the side wall of the opening of the port tube 1.

[0032] Specifically, by providing the second sealing ring 9 and the inner raised ring 501 , the sealing performance of the connection between the sealing sleeve 5 and the port pipe 1 is improved.

[0033] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A grouting reinforcement device for door opening engineering, characterized in that: The invention comprises a port pipe (1) clamped at the upper opening of a freezing hole, a grouting pipe (2) inserted into the freezing hole is provided at the central axis of the port pipe (1), and the grouting pipe (2) is fixedly connected to the inner wall of the port pipe (1) through a fixer (3); a sealing capillary (4) is inserted at the upper end of the grouting pipe (2), a sealing sleeve (5) is fixedly connected to the outer side of the sealing capillary (4), and the sealing sleeve (5) is fixedly sleeved at the upper opening of the port pipe (1); a one-way valve (6) is fixedly connected inside the sealing capillary (4); the fixer (3) comprises a guide ring (301) and fixing rods (302) fixed to the outer side of the guide ring (301) and distributed equidistantly around the circumference, the guide ring (301) is fixedly connected to the grouting pipe (2) by means of bolts, and the outer end of the fixing rod (302) is in sliding contact with the inner wall of the port pipe (1); the one-way valve (6) comprises a cylinder (601) fixedly connected to the inner wall of the sealing capillary (4). The lower part of the cylinder (601) is nested with a valve core (602) slidably connected thereto, the upper end of the valve core (602) is fixedly connected to a piston rod (603), the upper end of the piston rod (603) is slidably sleeved with a fixed cylinder (604), a spring (605) is provided in the fixed cylinder (604) and abuts against the upper end of the piston rod (603), the upper end of the fixed cylinder (604) is fixedly connected to a radial rod (606) fixedly connected to the inner wall of the cylinder (601); the sealing The sleeve (5) is a cylindrical structure with an open lower end. The sealing tube (4) passes through the sealing sleeve (5) and is integrally formed therewith. The sealing sleeve (5) is threadedly connected to the port tube (1). An inner raised ring (501) is fixedly connected to the inner side of the sealing sleeve (5). An annular groove is formed between the inner raised ring (501) and the outer wall of the sealing sleeve (5). A second sealing ring (9) is nested in the annular groove. The second sealing ring (9) abuts against the side wall of the opening of the port tube (1).

2. A grouting reinforcement device for door opening engineering according to claim 1, characterized in that: The upper opening of the sealed capillary tube (4) is fixedly connected to a pressure gauge (7).

3. A grouting reinforcement device for door opening engineering according to claim 1, characterized in that: The radial rod (606) is a strip-shaped rod with a triangular cross section, and its tip faces upward.

4. A grouting reinforcement device for door opening engineering according to claim 1, characterized in that: A plurality of first sealing rings (8) are fixedly sleeved on the outer wall of the lower end of the sealing capillary tube (4), and the first sealing rings (8) are interference-fitted with the inner wall of the grouting tube (2).

5. A grouting reinforcement device for door opening engineering according to claim 1, characterized in that: When in use, the following steps are included: Step 1: Before shield excavation, pull out the freezing pipe in the freezing hole; Step 2: insert the port tube (1) into the upper opening of the freezing hole; Step three, placing the grouting pipe (2) into the freezing hole and using a fixer (3) to fix the grouting pipe (2) at the center axis position of the freezing hole; Step 4: Fill the freezing hole with clay particles; Step 5: insert the sealing capillary tube (4) into the grouting tube (2) and securely sleeve the sealing sleeve (5) onto the upper opening of the port tube (1); Step six, performing shield excavation operation. After the shield excavation is completed, grouting is performed into the grouting pipe (2) through the sealed capillary tube (4).

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