Wall seam water-stopping device for underground continuous wall sleeve milling process and use method thereof

Abstract

The present invention discloses a wall seam water-stopping device for underground continuous wall sleeve milling process and its use method, comprising a plurality of grouting units, the grouting units comprising a main grouting pipe and a plurality of retractable auxiliary grouting pipes; the retractable auxiliary grouting pipe comprises an interface pipe, an outer sleeve and a retractable inner pipe which are sequentially connected with the corresponding main grouting pipe; the outer sleeve is sleeved on the corresponding interface pipe; the retractable inner pipe is arranged in the corresponding outer sleeve and can move axially along the inner hole of the outer sleeve; a spring is arranged between the retractable inner pipe and the interface pipe, and a limit pin is arranged in the retractable inner pipe; a pull-out steel core is arranged in the main grouting pipe; the pull-out steel core and the limit pin are tightened by a limit rope ring. During the pouring, a plurality of grouting units are first arranged in the steel cage of the pouring wall body; when pouring the first pouring wall body, the pull-out steel core is pulled out to make the retractable inner pipe pop out; after the pouring of the second pouring wall body, the wall seam light column slurry can be used to form water-stopping. The present invention can achieve a better wall seam water-stopping effect and reduce the construction risk caused by water leakage.

Description

Technical Field

[0001] The invention relates to the technical field of underground continuous wall casing milling water stopping, and in particular to a wall seam water stopping device used in an underground continuous wall casing milling process and a use method thereof. Background Art

[0002] In the prior art, when the depth of the underground continuous wall reaches more than 60m, the casing milling process is generally used for construction.

[0003] According to the current technological level, Figure 1 As shown, the verticality of the underground continuous wall is generally 3 / 1000. More experienced construction units can control the verticality at 2 / 1000. When the length of the underground wall reaches 100m, the verticality deviation reaches 200mm. The large-scale deviation and the uncertainty of the milling effect often lead to joint leakage or pressurized water penetration after foundation pit excavation, affecting the safety of the foundation pit and the normal construction of the internal structure.

[0004] The main hazards caused by construction deviation are as follows:

[0005] 1. Leakage occurs above the excavation surface of the foundation pit, affecting operations inside the foundation pit.

[0006] 2. In areas with abundant pressurized water, poor water-stopping in wall joints can easily lead to pressurized water penetrating underground walls, making it difficult to precipitate water in the pit and even causing sudden surges.

[0007] 3. If the overlap width of the milling is increased to reduce the deviation, the difficulty of the milling and the construction progress will increase.

[0008] Therefore, how to eliminate the influence of the verticality error of the continuous wall has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0009] In view of the above-mentioned defects of the prior art, the present invention provides a wall joint water-stopping device for underground continuous wall casing milling technology and a method of using the same, the purpose of which is to re-grout the wall joint between the first poured wall and the later poured wall after the underground continuous wall is completed, so as to achieve better wall joint water-stopping effect and reduce the construction risk caused by water leakage.

[0010] To achieve the above-mentioned purpose, the present invention discloses a wall seam water stopping device for underground continuous wall casing milling process. The underground continuous wall comprises a pre-cast wall body and a post-cast wall body.

[0011] Wherein, the water stop device is arranged in the first cast wall and fixed to the steel cage of the first cast wall;

[0012] The water-stopping device comprises a plurality of injection units, each of which comprises a vertically arranged main injection pipe and a plurality of retractable auxiliary injection pipes extending in the horizontal direction;

[0013] Each of the main pouring pipes is arranged in the steel cage of the first poured wall, and the upper end thereof extends out from the top of the first poured wall;

[0014] One end of each of the retractable auxiliary pouring pipes is connected to the corresponding main pouring pipe, and the other end points to the groove wall of the groove section to be poured corresponding to the wall gap between the first poured wall and the second poured wall;

[0015] Each of the telescopic secondary perfusion tubes comprises an interface tube, an outer sleeve and a telescopic inner tube which are sequentially connected to the corresponding primary perfusion tube;

[0016] Each of the interface tubes is perpendicular to the corresponding main perfusion tube and is fixedly connected to the corresponding outer sleeve;

[0017] The inner diameter of each outer sleeve is larger than the corresponding interface pipe and the corresponding telescopic inner pipe, and is sleeved on the corresponding interface pipe;

[0018] Each of the telescopic inner tubes is disposed in the corresponding outer sleeve and is connected to the outer sleeve in a movable pair, and is capable of axially moving along the inner hole of the outer sleeve;

[0019] A spring is provided between one end of each telescopic inner tube facing the corresponding mouthpiece and the mouthpiece, and a limit pin is provided inside each telescopic inner tube;

[0020] Each of the main perfusion pipes is provided with a pull-out steel core extending in the axial direction; a limit rope loop is provided between each of the pull-out steel cores and each of the corresponding limit pins;

[0021] Each of the telescopic inner tubes tightens the distance between the corresponding limiting pin and the corresponding pulling steel core through the corresponding limiting rope ring, thereby compressing the corresponding spring.

[0022] Preferably, the length of each outer sleeve and the corresponding telescopic inner tube meets the following condition: when the telescopic inner tube is extended, the telescopic inner tube points to one end of the groove wall and presses against the groove wall.

[0023] Preferably, each of the outer sleeves and the corresponding telescopic inner tube are made of polymer materials.

[0024] Preferably, each of the telescopic inner tubes is provided with a slurry stop valve, and each of the slurry stop valves is arranged at an end of the telescopic inner tube that is closer to the end pointing to the groove wall relative to the corresponding limit pin.

[0025] The present invention also provides a method for using a wall seam water-stopping device for an underground continuous wall sleeve milling process, the steps of which are as follows:

[0026] Step 1, tying a plurality of the pouring units to the steel cage of the first poured wall by welding or tying, so that each of the retractable auxiliary pouring pipes points to the groove wall of the groove section to be poured of the first poured wall;

[0027] Step 2, according to the grouting speed during the pouring of the first wall, the pulling steel core is pulled out, and the constraints on each of the telescopic inner tubes are removed one by one from bottom to top, so that each of the telescopic inner tubes is ejected by the corresponding spring to support the groove wall of the first wall to be poured;

[0028] Step 3: After completing the sleeve milling and pouring of the post-cast wall, a plurality of the pouring units are used to pour slurry into the wall joint between the pre-cast wall and the post-cast wall to form a water stop.

[0029] Beneficial effects of the present invention:

[0030] The present invention reduces the risk of leakage or sudden surge caused by vertical deviation of the underground continuous wall by re-grouting the wall joint between the first poured wall and the later poured wall. Compared with grouting methods such as rotary spraying outside the pit, it is simpler to operate, achieves better wall joint water-stopping effect, and reduces the construction risk caused by water leakage.

[0031] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A structural schematic diagram of the prior art is shown.

[0033] Figure 2 A schematic elevation structure diagram of an embodiment of the present invention is shown.

[0034] Figure 3 A schematic diagram of the planar structure of an embodiment of the present invention is shown.

[0035] Figure 4 A schematic diagram of a partial cross-sectional structure of a main perfusion pipe in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0036] Example

[0037] like Figures 2 to 4 As shown, a wall joint water stopping device is used for underground continuous wall sleeve milling technology, and the underground continuous wall includes a first cast wall body 1 and a post cast wall body 2.

[0038] Wherein, the water stop device is arranged in the first cast wall 1 and fixed to the steel cage of the first cast wall 1;

[0039] The water-stopping device comprises a plurality of pouring units 3, each of which comprises a vertically arranged main pouring pipe 4 and a plurality of retractable auxiliary pouring pipes 5 extending in the horizontal direction;

[0040] Each main pouring pipe 4 is arranged in the steel cage of the first poured wall 1, and the upper end extends from the top of the first poured wall 1;

[0041] One end of each retractable auxiliary pouring pipe 5 is connected to the corresponding main pouring pipe 4, and the other end points to the groove wall of the groove section to be poured corresponding to the wall gap between the first poured wall 1 and the second poured wall 2;

[0042] Each telescopic secondary perfusion tube 5 comprises an interface tube 6, an outer sleeve 7 and a telescopic inner tube 8 which are sequentially connected to the corresponding main perfusion tube 4;

[0043] Each interface tube 6 is perpendicular to the corresponding main perfusion tube 4 and is fixedly connected to the corresponding outer sleeve 7;

[0044] The inner diameter of each outer sleeve 7 is larger than the corresponding interface pipe 6 and the corresponding telescopic inner pipe 8, and is sleeved on the corresponding interface pipe 6;

[0045] Each telescopic inner tube 8 is disposed in the corresponding outer sleeve 7, and is connected to the outer sleeve 7 in a movable pair, and can move axially along the inner hole of the outer sleeve 7;

[0046] A spring 9 is provided between one end of each telescopic inner tube 8 facing the corresponding mouthpiece 6 and the mouthpiece 6, and a limit pin 10 is provided inside each telescopic inner tube 8;

[0047] Each main perfusion pipe 4 is provided with a pull-out steel core 11 extending in the axial direction; a limit rope ring 12 is provided between each pull-out steel core 11 and each corresponding limit pin 10;

[0048] Each telescopic inner tube 8 tightens the distance between the corresponding limiting pin 10 and the corresponding drawing steel core 11 through the corresponding limiting rope ring 12, thereby compressing the corresponding spring 9.

[0049] The principle of the present invention is that a water-stopping device including a plurality of grouting units 3 is arranged in the steel cage of the first poured wall 1, and a plurality of retractable auxiliary grouting pipes 5 are left at the wall joint position between the first poured wall 1 and the second poured wall 2. After the first poured wall 1 and the second poured wall 2 are completed, the wall joint between the first poured wall 1 and the second poured wall 2 can be grouted again to achieve water stopping of the wall joint.

[0050] In some embodiments, the lengths of each outer sleeve 7 and the corresponding telescopic inner tube 8 satisfy the following condition: when the telescopic inner tube 8 is extended, the telescopic inner tube 8 points to one end of the groove wall and presses against the groove wall.

[0051] In some embodiments, each outer sleeve 7 and the corresponding telescopic inner tube 8 are made of polymer material.

[0052] In some embodiments, each telescopic inner tube 8 is provided with a slurry stop valve 13 , and each slurry stop valve 13 is arranged at an end of the telescopic inner tube 8 pointing to the groove wall relative to the corresponding limit pin 10 .

[0053] The present invention also provides a method for using a wall seam water-stopping device for an underground continuous wall sleeve milling process, the steps of which are as follows:

[0054] Step 1: Tie a plurality of pouring units 3 to the steel cage of the first poured wall 1 by welding or tying, so that each retractable auxiliary pouring pipe 5 points to the groove wall of the first poured wall 1 to be poured;

[0055] Step 2: according to the grouting speed of the first cast wall 1 during casting, the steel core 11 is pulled out, and the constraints on each telescopic inner tube 8 are removed one by one from bottom to top, so that each telescopic inner tube 8 is ejected by the corresponding spring 9 to support the groove wall of the first cast wall 1 to be cast;

[0056] Step 3: After the milling and pouring of the post-cast wall 2 are completed, grout is poured into the wall joint between the first-cast wall 1 and the post-cast wall 2 through multiple pouring units 3 to form a water stop.

[0057] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A wall seam water-stopping device for underground continuous wall casing milling process, wherein the underground continuous wall comprises a first cast wall body (1) and a second cast wall body (2); characterized in that: The water-stop device is arranged in the first cast wall (1) and is fixed to the steel cage of the first cast wall (1); The water-stopping device comprises a plurality of injection units (3), each of the injection units (3) comprising a vertically arranged main injection pipe (4) and a plurality of telescopic auxiliary injection pipes (5) extending in the horizontal direction; Each of the main pouring pipes (4) is arranged in the steel cage of the first poured wall (1), and the upper end thereof extends out from the top of the first poured wall (1); One end of each of the retractable auxiliary pouring pipes (5) is connected to the corresponding main pouring pipe (4), and the other end points to the wall of the to-be-cast trough section corresponding to the wall joint between the first-cast wall (1) and the second-cast wall (2); Each of the telescopic secondary perfusion tubes (5) comprises a mouthpiece (6), an outer sleeve (7) and a telescopic inner tube (8) which are sequentially connected to the corresponding primary perfusion tube (4); Each of the interface tubes (6) is perpendicular to the corresponding main perfusion tube (4) and is fixedly connected to the corresponding outer sleeve (7); The inner diameter of each outer sleeve (7) is larger than the corresponding interface tube (6) and the corresponding telescopic inner tube (8), and is sleeved on the corresponding interface tube (6); Each of the telescopic inner tubes (8) is disposed in the corresponding outer sleeve (7), connected to the outer sleeve (7) in a movable pair, and is capable of axially moving along the inner hole of the outer sleeve (7); A spring (9) is provided between one end of each telescopic inner tube (8) facing the corresponding mouthpiece (6) and the mouthpiece (6), and a limit pin (10) is provided inside each telescopic inner tube (8); Each of the main perfusion pipes (4) is provided with a pull-out steel core (11) extending in the axial direction; a limit rope ring (12) is provided between each of the pull-out steel cores (11) and each of the corresponding limit pins (10); Each of the telescopic inner tubes (8) tightens the distance between the corresponding limiting pin (10) and the corresponding pulling steel core (11) through the corresponding limiting rope ring (12), thereby compressing the corresponding spring (9).

2. The wall seam water stopping device for underground continuous wall sleeve milling process according to claim 1 is characterized in that: The lengths of each outer sleeve (7) and the corresponding telescopic inner tube (8) satisfy the following condition: when the telescopic inner tube (8) is extended, the telescopic inner tube (8) points to one end of the groove wall and presses against the groove wall.

3. The wall seam water stopping device for underground continuous wall sleeve milling process according to claim 1 is characterized in that: Each of the outer sleeves (7) and the corresponding telescopic inner tube (8) are made of polymer materials.

4. The wall seam water stopping device for underground continuous wall sleeve milling process according to claim 1 is characterized in that: Each of the telescopic inner tubes (8) is provided with a slurry stop valve (13), and each of the slurry stop valves (13) is arranged at an end of the telescopic inner tube (8) pointing toward the groove wall and closer to the corresponding limit pin (10).

5. The method for using the wall seam water-stopping device for underground continuous wall sleeve milling process according to claim 1, comprising the following steps: Step 1: Tie a plurality of the pouring units (3) to the steel cage of the first poured wall (1) by welding or tying, so that each of the retractable auxiliary pouring pipes (5) points to the wall of the first poured wall (1) where the groove section is to be poured; Step 2, according to the grouting speed of the first cast wall (1) during casting, the pulling steel core (11) is pulled out, and the constraints on each of the telescopic inner tubes (8) are removed one by one from bottom to top, so that each of the telescopic inner tubes (8) is ejected by the corresponding spring (9) to support the groove wall of the first cast wall (1) to be cast; Step 3: After completing the milling and pouring of the post-cast wall (2), a plurality of the pouring units (3) are used to pour slurry into the wall joint between the first-cast wall (1) and the post-cast wall (2) to form a water stop.

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