阅读说明：本技术 用于地下结构外墙后开电缆孔的防水封堵方法 (Waterproof plugging method for cable hole formed in rear of outer wall of underground structure ) 是由 华坤 姜波 陈轩 孙岩 彭益成 刘伟亮 吴波 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种用于地下结构外墙后开电缆孔的防水封堵方法,包括以下步骤：1、在地下结构外墙的墙身,对应穿越电缆的位置开凿多个圆孔形成圆孔组；2、在墙身室内一面,围绕圆孔组的周边设置一圈缓胀型遇水膨胀橡胶止水条；3、在遇水膨胀橡胶止水条的内侧和外侧均涂覆一层聚氨酯防水密封膏,形成复合密封层；4、在复合密封层朝向室内的一面设置带有电缆保护管的不锈钢封面板,并与遇水膨胀橡胶止水条和聚氨酯防水密封膏紧贴,采用多个化学螺栓均匀压紧后固定在墙身；5、当不锈钢封面板呈平整状态且聚氨酯防水密封膏溢出不锈钢封面板的边缘后停止压紧。本发明的应用使地下结构外墙开孔范围小,最大程度降低对原有结构的破坏,防水性能优良。(The invention discloses a waterproof plugging method for an underground structure outer wall rear opening cable hole, which comprises the following steps: 1. a plurality of round holes are drilled in the wall body of the outer wall of the underground structure corresponding to the positions of the cables to form a round hole group; 2. a circle of slowly-expanding water-swelling rubber water stop strip is arranged on one indoor surface of the wall body around the periphery of the round hole group; 3. coating a layer of polyurethane waterproof sealant on the inner side and the outer side of the water-swelling rubber water stop strip to form a composite sealing layer; 4. arranging a stainless steel sealing panel with a cable protection pipe on one indoor side of the composite sealing layer, tightly attaching the stainless steel sealing panel with the water-swelling rubber water stop strip and the polyurethane waterproof sealing paste, and uniformly pressing by adopting a plurality of chemical bolts and then fixing the chemical bolts on the wall body; 5. and when the stainless steel sealing panel is in a flat state and the polyurethane waterproof sealant overflows the edge of the stainless steel sealing panel, the stainless steel sealing panel stops compressing. The application of the invention ensures that the hole opening range of the outer wall of the underground structure is small, the damage to the original structure is reduced to the maximum extent, and the waterproof performance is excellent.)

1. A waterproof plugging method for an underground structure outer wall rear open cable hole is characterized by comprising the following steps:

step 1, digging a plurality of round holes (2) at positions corresponding to the cable passing through to form a round hole group on a wall body (1) of an underground structure outer wall, and polishing and cleaning the inner wall of each round hole (2);

step 2, arranging a circle of slowly-expanding water-swelling rubber water stop strip (3) around the periphery of the round hole group on the indoor side of the wall body (1);

the joints at the two ends of the water-swelling rubber water stop strip (3) are closely coated with polyurethane waterproof sealant (31) for connection and sealing;

step 3, coating a layer of polyurethane waterproof sealant (4) on one surface of the underground structure outer wall facing the indoor space and on the inner side and the outer side of the water-swelling rubber water stop strip (3);

the thickness of the polyurethane waterproof sealing paste (4) is matched with that of the water-swelling rubber water stop strip (3), and a composite sealing layer covering the periphery of the circular hole group is formed in the direction facing the indoor space;

step 4, arranging a stainless steel sealing panel (6) with a cable protection pipe (5) on one surface of the composite sealing layer facing the indoor space; each cable protection pipe (5) is arranged in the round hole (2);

one surface of the stainless steel sealing panel (6) facing the composite sealing layer is tightly attached to the water-swelling rubber water stop strip (3) and the polyurethane waterproof sealing paste (4), and is fixed on the wall body (1) after being uniformly compressed by a plurality of chemical bolts (8);

step 5, after the stainless steel sealing panel (6) is in a flat state and the polyurethane waterproof sealant (4) overflows the edge of the stainless steel sealing panel (6), stopping compressing and erasing the excessive part of the polyurethane waterproof sealant (4) which overflows;

during the compression, the polyurethane waterproof sealant (4) is pressed into a gap between each circular hole (2) and the corresponding cable protection tube (5).

2. The method for the waterproof plugging of cable holes opened backwards in the outer wall of underground structures according to claim 1, characterized in that each cable protection tube (5) protrudes five millimeters beyond the stainless steel cover plate (6) towards the indoor end.

3. The waterproof plugging method for the cable holes formed in the back of the outer wall of the underground structure as claimed in claim 1, wherein each cable protection pipe (5) is a galvanized steel pipe and is connected with the stainless steel sealing plate (6) by welding.

4. The waterproof plugging method for the cable holes formed in the back of the outer wall of the underground structure as claimed in claim 2, wherein each cable protection tube (5) is tightly connected with the stainless steel sealing plate (6) by a fillet weld.

5. The waterproof plugging method for the cable hole opened behind the outer wall of the underground structure as claimed in claim 1, wherein during the use process, if the water stain is leaked, the chemical bolt (8) is unscrewed, the stainless steel sealing plate (6), the water-swelling rubber sealing strip (3) and the polyurethane waterproof sealant (4) are removed, and then the steps 1 to 5 are executed again for waterproof repair.

6. The waterproof plugging method for the cable holes opened behind the outer wall of the underground structure according to claim 1, wherein the inner diameter of each circular hole (2) is 3 mm to 5 mm larger than the outer diameter of the corresponding cable protection pipe (5).

7. The waterproof plugging method for the cable holes formed behind the outer wall of the underground structure according to claim 1, wherein a strip-shaped stainless steel sheet (7) is padded between each chemical bolt (8) and the stainless steel sealing plate (6).

8. The waterproof plugging method for the cable holes opened behind the outer wall of the underground structure as claimed in claim 7, wherein the thickness of each strip-shaped stainless steel sheet (7) is 2 mm to 3 mm.

9. The waterproof plugging method for the cable holes formed in the back of the outer wall of the underground structure according to claim 7, wherein each strip-shaped stainless steel sheet (7) is connected with the stainless steel sealing panel (6) through a fillet weld.

Technical Field

The invention relates to the technical field of underground engineering, in particular to a waterproof plugging method for an underground structure outer wall rear-opened cable hole.

Background

For an underground cable layer and an electric power tunnel of a transformer substation, when a cable passes through an outer wall of an underground structure, a corresponding waterproof sleeve is pre-buried in a concrete wall in advance. However, in some reconstruction and expansion projects, a part of cables often need to be newly added according to actual requirements, and the concrete wall body is not provided with pre-buried waterproof sleeves corresponding to the cables, so that the problems of rear opening and waterproof plugging of the outer wall of an underground structure are involved.

One of the most typical quality problems of the rear opening of the outer wall is serious water leakage, and because the wall body is not provided with the waterproof sleeve, underground water on the water facing side of the outer wall of the underground structure easily leaks into the underground structure along a gap between the rear opening and the cable, so that the durability of the underground structure is reduced, and the drying state of the cable is also seriously influenced.

In the prior art, the waterproof method for processing cable holes in the rear of an outer wall of an underground structure mainly focuses on plugging the inner part of the wall, namely, a square hole which is far larger than a cable through hole is drilled in a concrete wall, then a galvanized steel pipe sleeved with a water stop steel plate is buried in the square hole, and the whole square hole is poured by fine aggregate concrete.

However, in practical applications, the above prior art has the following disadvantages:

(1) in order to embed the water stop steel plate, the size of the opening of the underground structure wall is far larger than that of an actual cable hole, so that the structural strength and safety are greatly damaged;

(2) even when the galvanized steel pipe with the water stop steel plate is placed in the concrete wall body, the two sides of the water stop steel plate, particularly the space between the two sides of the water stop steel plate and the soil body outside the wall body, are difficult to pour compactly, so that a secondary gap is formed;

(3) when water leakage occurs, effective measures cannot be taken to perform waterproof remediation, generally plugging and grouting are needed, maintenance cost is high, and construction convenience is low.

Therefore, how to observe the water seepage situation and improve the replacement and maintenance efficiency become technical problems which need to be solved by technical personnel in the field.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is directed to reduce the range of the opening of the outer wall of the underground structure, and to transfer the waterproof structure from the inside of the wall of the underground structure to the inside of the wall, so as to facilitate observation of water seepage and real-time replacement and maintenance.

In order to achieve the technical purpose, the invention provides a waterproof plugging method for an underground structure outer wall rear open cable hole; the method comprises the following steps:

step 1, digging a plurality of round holes at positions corresponding to the positions of cables passing through the wall body of the outer wall of the underground structure to form a round hole group, and polishing and cleaning the inner wall of each round hole;

step 2, arranging a circle of slowly-expanding water-swelling rubber water stop strip around the periphery of the round hole group on the indoor side of the wall body;

the joints at the two ends of the water-swelling rubber water stop strip are closely coated with polyurethane waterproof sealant for connection and sealing;

step 3, coating a layer of polyurethane waterproof sealant on one surface of the underground structure outer wall facing the indoor space and on the inner side and the outer side of the water-swelling rubber water stop strip;

the thickness of the polyurethane waterproof sealing paste is matched with that of the water-swelling rubber water stop strip, and a composite sealing layer covering the periphery of the circular hole group is formed in the direction facing the indoor space;

step 4, arranging a stainless steel sealing panel with a cable protection pipe on one surface of the composite sealing layer facing the indoor space; each cable protection pipe is arranged in the round hole;

one surface of the stainless steel sealing panel facing the composite sealing layer is tightly attached to the water-swelling rubber water stop strip and the polyurethane waterproof sealing paste, and is fixed on the wall body after being uniformly compressed by a plurality of chemical bolts;

step 5, after the stainless steel sealing panel is in a flat state and the polyurethane waterproof sealant overflows the edge of the stainless steel sealing panel, stopping compressing and erasing the excessive part of the polyurethane waterproof sealant which overflows;

during the compression, the polyurethane waterproof sealant is extruded into a gap between each circular hole and the corresponding cable protection pipe.

Preferably, one end of each cable protection pipe facing the indoor space extends out of the stainless steel cover plate by five millimeters.

Preferably, each cable protection pipe is a galvanized steel pipe and is connected with the stainless steel cover plate in a welding mode.

More preferably, each cable protection pipe is tightly connected with the stainless steel cover plate through a fillet weld.

Preferably, in the use process, if seepage water stain appears, screw out the chemical bolt, demolish the stainless steel closing plate the water-swelling rubber sealing rod with behind the waterproof sealant of polyurethane, carry out step 1 to step 5 again, carry out waterproof restoration.

Preferably, the inner diameter of each circular hole is 3 mm to 5 mm larger than the outer diameter of the corresponding cable protection tube.

Preferably, a strip-shaped stainless steel sheet is padded between each chemical bolt and the stainless steel cover plate.

More preferably, each of the strip-shaped stainless steel sheets has a thickness of 2 mm to 3 mm.

More preferably, each strip-shaped stainless steel sheet is connected with the stainless steel cover plate through a fillet weld.

The invention has the beneficial effects that:

the application of the invention ensures that the hole opening range of the outer wall of the underground structure is small, the damage to the original structure can be reduced to the greatest extent, all waterproof construction measures are arranged at the indoor side of the outer wall of the basement, the construction is convenient, the quality is controllable, and the cable can be removed and replaced when obvious water leakage occurs in the use process, thereby greatly improving the water leakage situation when the cable hole is opened at the back of the outer wall of the underground structure.

Drawings

Fig. 1 shows a schematic cross-sectional structure of an embodiment of the present invention.

Fig. 2 is a schematic view illustrating a state where the wall faces the indoor side after step 1 is completed according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of the process after step 1 is completed according to an embodiment of the present invention.

Fig. 4 is a schematic view illustrating a state where the wall faces the indoor side after step 2 is completed according to an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of step 2 after completion in an embodiment of the present invention.

Fig. 6 is a schematic view illustrating a state where the wall faces the indoor side after step 3 is completed according to an embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view of step 3 after completion in an embodiment of the present invention.

Fig. 8 is a schematic view illustrating a state where the wall faces the indoor side after step 4 is completed according to an embodiment of the present invention.

Fig. 9 is a schematic cross-sectional view of the completed step 4 according to an embodiment of the present invention.

Fig. 10 is a schematic view illustrating a state where the wall faces the indoor side after step 5 is completed according to an embodiment of the present invention.

Fig. 11 is a schematic cross-sectional view of a stainless steel cover plate according to an embodiment of the present invention.

In the figure: 1 wall, 2 round holes, 3 water-swelling rubber sealing strips, 31 polyurethane waterproof sealant, 4 polyurethane waterproof sealant, 5 cable protection pipes, 6 stainless steel sealing panels, 7 strip-shaped stainless steel sheets and 8 chemical bolts.

Detailed Description

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Example (b):

as shown in fig. 1 to 10, a waterproof plugging method for a cable hole formed behind an outer wall of an underground structure; the method comprises the following steps:

step 1, cutting a plurality of circular holes 2 at positions corresponding to the cable passing through positions of a wall body 1 of an outer wall of an underground structure to form circular hole groups, and polishing and cleaning the inner wall of each circular hole 2;

step 2, arranging a circle of slowly-expanding water-swelling rubber water stop strip 3 around the periphery of the round hole group on the indoor side of the wall body 1;

the joints at the two ends of the water-swelling rubber water stop strip 3 are closely coated with polyurethane waterproof sealant 31 for connection and sealing;

step 3, coating a layer of polyurethane waterproof sealant 4 on the indoor side of the underground structure outer wall and on the inner side and the outer side of the water-swelling rubber water stop strip 3;

the thickness of the polyurethane waterproof sealing paste 4 is matched with that of the water-swelling rubber water stop strip 3, and a composite sealing layer covering the periphery of the circular hole group is formed in the direction facing the indoor;

step 4, arranging a stainless steel sealing panel 6 with a cable protection pipe 5 on one surface of the composite sealing layer facing the indoor; each cable protection pipe 5 is arranged in the circular hole 2;

one surface of the stainless steel sealing panel 6 facing the composite sealing layer is tightly attached to the water-swelling rubber water stop strip 3 and the polyurethane waterproof sealing paste 4, and is fixed on the wall body 1 after being uniformly compressed by a plurality of chemical bolts 8;

step 5, after the stainless steel sealing panel 6 is in a flat state and the polyurethane waterproof sealant 4 overflows the edge of the stainless steel sealing panel 6, stopping compressing and erasing the excessive part of the polyurethane waterproof sealant 4 which overflows;

during the pressing, the polyurethane waterproofing mastic 4 is pressed into the gap between each round hole 2 and the respective cable protection tube 5.

Through the execution of the steps, the range of the hole group on the outer wall of the underground structure can be reduced, and the damage to the original structure is reduced to the maximum extent. Meanwhile, all waterproof construction measures are arranged on the indoor side of the basement outer wall, construction is convenient, quality is controllable, when obvious water seepage occurs in the using process, the water seepage can be replaced after being disassembled, and the water seepage situation of the underground structure outer wall when a cable hole is opened is greatly improved. The method can be widely applied to the anti-leakage treatment of the cable holes formed behind the outer wall of the basement such as a transformer substation cable layer or a power tunnel.

As shown in fig. 11, on the basis of the above-mentioned embodiments, in some embodiments, the cable protection tube 5 on the stainless steel panel 6 extends five millimeters beyond the stainless steel panel 6 at the end facing the indoor space.

In some embodiments, each cable protection tube 5 on the stainless steel cover plate 6 is a galvanized steel tube, and is connected to the stainless steel cover plate 6 by welding.

In some embodiments, each cable protection tube 5 on the stainless steel cover plate 6 is tightly connected to the stainless steel cover plate 6 by a fillet weld.

In some embodiments, in the using process, if the water stain is leaked, the chemical bolt 8 is screwed out, the stainless steel sealing panel 6, the water-swelling rubber water stop strip 3 and the polyurethane waterproof sealant 4 are removed, and then the steps 1 to 5 are executed again to perform waterproof repair.

In some embodiments, the inner diameter of each circular hole 2 in the wall 1 of the outer wall of the underground structure is 3 mm to 5 mm larger than the outer diameter of the corresponding cable protection tube 5.

In practical application, the gap formed between the inner diameter of the round hole 2 and the outer diameter of the cable protection tube 5 enables the cable protection tube 5 to be smoothly placed into the round hole 2, and meanwhile, no overlarge gap is left, so that the polyurethane waterproof sealant 4 is filled in the round hole after being compressed.

In some embodiments, a strip-shaped stainless steel sheet 7 is padded between each chemical bolt 8 for pressing and fixing the stainless steel cover plate 6 to the wall body 1 and the stainless steel cover plate 6.

In addition to the above embodiments, in some embodiments, each strip-shaped stainless steel sheet 7 has a thickness of 2 mm to 3 mm.

In some embodiments, each strip of stainless steel foil 7 is connected to the stainless steel cover plate 6 by a fillet weld.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.