Seepage-proof sealing method for pipe joint connector of concrete jacking pipe

Abstract

The invention discloses an anti-seepage sealing method for a concrete pipe-jacking pipe joint connector, which comprises a concrete pipe and a steel pipe, a step is arranged on the outer pipe wall of the concrete pipe, the concrete pipe is matched with the steel pipe through the step of the concrete pipe, and two waterproof rings are arranged between the concrete pipe and the steel pipe. The concrete pipe is provided with two waterproof rings, the two waterproof rings are both located at the step and are in a non-contact state, the step of the concrete pipe is provided with a coarse wall face, the two waterproof rings are both in contact with the coarse wall face, and grouting is conducted between the two waterproof rings. The sealing method has the following beneficial effects that after the slurry is solidified, the concrete pipe and the waterproof ring are bonded into a whole through the slurry, the waterproof ring is tightly attached to the inner wall of the steel pipe, it is ensured that the stability among the concrete pipe, the steel pipe and the waterproof ring is improved, and it is ensured that the whole joint has good sealing performance.

Description

Technical Field

[0001] The invention relates to the field of civil construction, and in particular to a method for sealing a concrete jacking pipe joint to prevent water seepage. Background Art

[0002] The pipe joints of the jacking pipe are the weak link of the jacking pipe tunnel structure. Water seepage is very likely to occur during use. In order to avoid water seepage at the pipe joints of the jacking pipe, the patent publication CN117287558A discloses a sealing and anti-seepage method at the pipe joints. The method is waterproofed by setting two layers of water stop rings between the steel pipe and the concrete pipe, wherein the water stop rings are composed of two types of rubber, namely chloroprene rubber and water-swellable rubber. When the water stop ring encounters water, it expands to achieve sealing and waterproofing between the steel pipe and the concrete pipe. However, since this water stop ring is made of two types of rubber, once one of the rubber materials ages, it will lose its waterproof effect and will cause the matching stability of the steel pipe and the concrete pipe to decrease. Summary of the invention

[0003] In view of the above problems, the present invention proposes a method for waterproofing and sealing concrete jacking pipe joints, wherein the pipe wall of the concrete pipe is firstly polished and roughened, and then a waterproof ring is arranged between the concrete pipe and the steel pipe, and then grouting is performed between the two waterproof rings. After the slurry solidifies, the slurry will bond the concrete pipe and the waterproof ring into a whole, and the waterproof ring is tightly attached to the inner wall of the steel pipe, thereby improving the stability among the concrete pipe, the steel pipe and the waterproof ring, ensuring that the entire joint has good sealing performance and at the same time has stronger resistance to external impact.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A method for sealing a concrete pipe joint against water seepage, comprising a concrete pipe and a steel pipe. A step is provided at the outer pipe wall of the concrete pipe. The concrete pipe cooperates with the steel pipe through its own step. Two waterproof rings are provided between the concrete pipe and the steel pipe, and both waterproof rings are located at the step. The two waterproof rings are in a non-contact state. A rough wall surface is provided at the step of the concrete pipe. Both waterproof rings are in contact with the rough wall surface. Grouting is performed between the two waterproof rings.

[0006] In this anti-seepage sealing method, firstly, two waterproof rings are stuck between the concrete pipe and the steel pipe, and the waterproof rings are used to waterproof and seal the concrete pipe and the steel pipe. In this anti-seepage sealing method, the wall surface at the step of the concrete pipe is a rough wall surface, and the two waterproof rings are set at the rough wall surface. The existence of the rough wall surface can increase the friction between the waterproof ring and the waterproof ring, and can be used as a seepage gap for the slurry. Therefore, in this waterproof sealing method, when grouting between the two waterproof rings, the slurry can seep through the seepage gap when filling the two waterproof rubber rings. When the slurry solidifies, it can not only complete the sealing of the above-mentioned seepage gap, but also bond the waterproof ring and the concrete pipe together. When the slurry solidifies, the waterproof ring, the concrete pipe and the slurry form a whole, which can greatly improve the stability among the concrete pipe, the steel pipe and the waterproof ring, ensure that the entire joint has good sealing performance, and at the same time have stronger resistance to external impact.

[0007] To sum up, in this anti-seepage sealing method, the wall of the concrete pipe is first polished rough, and then a waterproof ring is set between the concrete pipe and the steel pipe, and then grouting is performed between the two waterproof rings. After the slurry solidifies, the slurry will bond the concrete pipe and the waterproof ring into a whole, and the waterproof ring is close to the inner wall of the steel pipe, ensuring that the stability among the concrete pipe, steel pipe and waterproof ring is improved, ensuring that the entire joint has good sealing performance, and at the same time has stronger resistance to external impact.

[0008] Optionally, the grouting holes are opened on the pipe wall of the concrete pipe.

[0009] The specific grouting hole is located between the two waterproof rings. The slurry flows out of the grouting hole and seeps to both sides. When the slurry is completed, the mouth of the main slurry hole is sealed, and then the slurry is waited for to solidify. Part of the slurry is located between the concrete pipe and the steel pipe, and part of the slurry is located in the grouting hole of the concrete pipe. All the slurry is condensed into a whole. In this way, with the help of the solidified slurry, it is equivalent to directly embedding the concrete pipe, the slurry and the waterproof ring on the concrete pipe, further improving the waterproof sealing between the concrete pipe and the steel pipe.

[0010] Optionally, a corrugated surface and an inclined plane are provided on the waterproof ring, the corrugated surface is close to the rough wall surface, the inclined plane is close to the inner wall of the steel pipe, and the angle formed by the corrugated surface and the inclined plane is an acute angle.

[0011] The corrugated surface of the waterproof ring is close to the rough wall surface, and the inclined plane of the waterproof ring is close to the inner wall of the steel pipe. The existence of the corrugated surface can increase the gap between the waterproof ring and the concrete pipe. The existence of these gaps can allow the slurry to fully infiltrate. Secondly, after the slurry solidifies, the presence of the corrugated surface can increase the contact area between the waterproof ring and the slurry, thereby improving the bonding strength between the slurry and the waterproof ring. At the same time, it can accommodate more slurry between the waterproof ring and the rough wall surface. The slurry can push the waterproof ring toward the steel pipe, thereby improving the waterproof effect between the steel pipe and the waterproof ring.

[0012] Optionally, a groove is provided on the waterproof ring, and the groove is located between the corrugated surface and the inclined plane.

[0013] A groove is provided on the waterproof ring, which is semicircular and located between the corrugated surface and the inclined plane. During assembly, the waterproof ring needs to be put on the concrete pipe first, and then docked with the steel pipe. The inclined plane of the waterproof ring contacts the steel pipe. When the waterproof ring continuously enters the steel pipe, the waterproof ring will be continuously squeezed and deformed. In order to make the inclined plane of the waterproof ring stably close to the steel pipe, a groove is provided on the drain trough. The groove is located between the inclined plane and the corrugated surface. When the steel pipe squeezes the inclined plane of the waterproof ring, the existence of the groove can make the waterproof ring adaptively deformed, ensuring that the inclined plane on the waterproof ring can always stably close to the inner wall of the steel pipe. After the grouting is completed, the slurry is filled into the groove. After the slurry solidifies, it expands, pushing the inclined plane on the waterproof ring further toward the steel pipe, so that the inclined plane of the waterproof ring is further close to the steel pipe.

[0014] Optionally, the waterproof ring includes a waterproof ring made of EPDM rubber, and the slurry includes acrylate monomer, ammonium persulfate, triethanolamine, N,N-methylenebisacrylamide, ferrous sulfate, glycerol and deionized water.

[0015] The grouting slurry used in this sealing method is composed of acrylate monomer, ammonium persulfate, triethanolamine, N,N-methylenebisacrylamide, ferrous sulfate, glycerol and deionized water. This slurry actually forms a gel-like substance after solidification, so the slurry has elasticity after solidification. Such elastic gel has relatively good sealing properties and makes the steel pipe and concrete pipe have better adaptability to torsional deformation, thereby ensuring that when the geological conditions change, the pipe joints still have good waterproof sealing properties.

[0016] Optionally, the slurry includes, by mass, 15 to 25 parts of acrylate monomer, 0.5 to 2 parts of ammonium persulfate, 0.1 to 0.5 parts of triethanolamine, 0.1 to 0.3 parts of N,N-methylenebisacrylamide, 0.05 to 0.1 parts of ferrous sulfate, 2 to 4 parts of glycerol, and 65 to 85 parts of deionized water.

[0017] Optionally, a pH regulator is also included, and the pH regulator is used to maintain the pH of the entire slurry between 8 and 9.

[0018] The specific pH adjuster is used to maintain the reaction stability when the slurry solidifies. The specific pH adjuster includes but is not limited to sodium bicarbonate.

[0019] Optionally, the waterproof ring is a trapezoidal waterproof ring, and the two waterproof rings are oriented in the same direction.

[0020] Optionally, a placement groove is provided at the step, the bottom of the placement groove is a rough wall surface, and the waterproof ring is stuck in the placement groove.

[0021] The function of the placement groove is to initially fix the waterproof ring. First, put the waterproof ring on the placement groove of the concrete pipe, and then connect the steel pipe with the waterproof ring so that the waterproof ring is stuck into the steel pipe.

[0022] The beneficial effects of the present invention are as follows: firstly, the wall of the concrete pipe is polished to be rough, and then a waterproof ring is arranged between the concrete pipe and the steel pipe, and then grouting is performed between the two waterproof rings. After the slurry solidifies, the slurry will bond the concrete pipe and the waterproof ring into a whole, and the waterproof ring is tightly attached to the inner wall of the steel pipe, thereby ensuring that the stability among the concrete pipe, the steel pipe and the waterproof ring is improved, ensuring that the entire joint has good sealing performance, and at the same time having stronger resistance to external impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the structure of the waterproof ring;

[0025] Figure 2 It is a schematic diagram showing the positional relationship among the concrete pipe, steel pipe and waterproof ring.

[0026] The reference numerals in the figure are: 1, waterproof ring; 101, corrugated surface; 102, groove; 103, inclined plane; 2, steel pipe; 3, concrete pipe; 301, step; 302, grouting hole; 303, placement groove; 4, gel. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] As attached Figure 1 And attached Figure 2 As shown, a method for waterproofing a concrete jacking pipe joint includes a concrete pipe 3 and a steel pipe 2. A step 301 is provided at the outer pipe wall of the concrete pipe 3. The concrete pipe 3 cooperates with the steel pipe 2 through its own step 301. Two waterproof rings 1 are provided between the concrete pipe 3 and the steel pipe 2, and the two waterproof rings 1 are both located at the step 301. The two waterproof rings 1 are in a non-contact state. A rough wall surface is provided at the step 301 of the concrete pipe 3. The two waterproof rings 1 are in contact with the rough wall surface, and grouting is performed between the two waterproof rings 1.

[0031] In this anti-seepage sealing method, first, two waterproof rings 1 are stuck between the concrete pipe 3 and the steel pipe 2, and the waterproof rings 1 are used to waterproof and seal between the concrete pipe 3 and the steel pipe 2. In this anti-seepage sealing method, the wall surface at the step 301 of the concrete pipe 3 is a rough wall surface, and the two waterproof rings 1 are set at the rough wall surface. The existence of the rough wall surface can increase the friction between the waterproof ring 1 and the waterproof ring 1, and can be used as a seepage gap for the slurry. Therefore, in this waterproof sealing method, when grouting is injected between the two waterproof rings 1, the slurry can seep through the seepage gap when filling the two waterproof rubber rings. When the slurry solidifies, it can not only complete the sealing of the above-mentioned seepage gap, but also bond the waterproof ring 1 and the concrete pipe 3 together. When the slurry solidifies, the waterproof ring 1, the concrete pipe 3 and the slurry form a whole, which can greatly improve the stability among the concrete pipe 3, the steel pipe 2 and the waterproof ring 1, ensuring that the entire joint has good sealing performance and has stronger resistance to external impact.

[0032] In summary, in this anti-seepage sealing method, the wall of the concrete pipe 3 is first polished rough, and then a waterproof ring 1 is set between the concrete pipe 3 and the steel pipe 2, and then grouting is performed between the two waterproof rings 1. After the slurry solidifies, the slurry will bond the concrete pipe 3 and the waterproof ring 1 into a whole, and the waterproof ring 1 is close to the inner wall of the steel pipe 2, ensuring that the stability among the concrete pipe 3, the steel pipe 2 and the waterproof ring 1 is improved, ensuring that the entire joint has good sealing performance, and at the same time has stronger resistance to external impact.

[0033] As attached Figure 1 And attached Figure 2 As shown, the grouting hole 302 is opened on the wall of the concrete pipe 3.

[0034] The specific grouting hole 302 is located between the two waterproof rings 1. The slurry flows out of the grouting hole 302 and seeps to both sides. After the slurry is completed, the opening of the main slurry hole is sealed, and then the slurry is waited for to solidify. Part of the slurry is located between the concrete pipe 3 and the steel pipe 2, and part of the slurry is located in the grouting hole 302 of the concrete pipe 3. All the slurry is solidified into a whole. In this way, with the help of the solidified slurry, it is equivalent to directly embedding the concrete pipe 3, the slurry and the waterproof ring 1 on the concrete pipe 3, thereby further improving the waterproof sealing between the concrete pipe 3 and the steel pipe 2.

[0035] As attached Figure 1 And attached Figure 2 As shown, the waterproof ring 1 is provided with a corrugated surface 101 and an inclined plane 103. The corrugated surface 101 is close to the rough wall surface, and the inclined plane 103 is close to the inner wall of the steel pipe 2. The angle formed by the corrugated surface 101 and the inclined plane 103 is an acute angle.

[0036] The corrugated surface 101 of the waterproof ring 1 is close to the rough wall surface, and the inclined plane 103 of the waterproof ring 1 is close to the inner wall of the steel pipe 2. The existence of the corrugated surface 101 can increase the gap between the waterproof ring 1 and the concrete pipe 3. The existence of these gaps can allow the slurry to fully infiltrate. Secondly, after the slurry solidifies, the existence of the corrugated surface 101 can increase the contact area between the waterproof ring 1 and the slurry, thereby improving the bonding strength between the slurry and the waterproof ring 1. At the same time, more slurry can be accommodated between the waterproof ring 1 and the rough wall surface. The slurry can push the waterproof ring 1 toward the steel pipe 2, thereby improving the waterproof effect between the steel pipe 2 and the waterproof ring 1.

[0037] As attached Figure 1 And attached Figure 2 As shown, a groove 102 is formed on the waterproof ring 1 , and the groove 102 is located between the corrugated surface 101 and the inclined plane 103 .

[0038] A groove 102 is provided on the waterproof ring 1, and the groove 102 is semicircular in shape, and is located between the corrugated surface 101 and the inclined plane 103. Because during assembly, the waterproof ring 1 needs to be put on the concrete pipe 3 first, and then the waterproof ring 1 is docked with the steel pipe 2 after being put on the concrete pipe 3, wherein the inclined plane 103 of the waterproof ring 1 is in contact with the steel pipe 2. In this way, when the waterproof ring 1 continuously enters the steel pipe 2, the waterproof ring 1 will be continuously squeezed and deformed. In order to make the inclined plane 103 of the waterproof ring 1 stably close to the steel pipe 2, a groove 102 is provided on the drain trough, and the groove 102 is located between the inclined plane 103 and the corrugated surface 101. When the steel pipe 2 squeezes the inclined plane 103 of the waterproof ring 1, the existence of the groove 102 can make the waterproof ring 1 adaptively deform, thereby ensuring that the inclined plane 103 on the waterproof ring 1 can always stably close to the inner wall of the steel pipe 2. After the grouting is completed, the slurry fills the groove 102 , and the slurry expands after solidification, pushing the inclined plane 103 on the waterproof ring 1 further toward the steel pipe 2 , so that the inclined plane 103 of the waterproof ring 1 is further close to the steel pipe 2 .

[0039] As attached Figure 1 And attached Figure 2 As shown, the waterproof ring 1 includes a waterproof ring 1 made of EPDM rubber, and the slurry includes acrylate monomer, ammonium persulfate, triethanolamine, N,N-methylenebisacrylamide, ferrous sulfate, glycerol and deionized water.

[0040] The grouting slurry used in this sealing method is composed of acrylate monomer, ammonium persulfate, triethanolamine, N,N-methylenebisacrylamide, ferrous sulfate, glycerol and deionized water. After solidification, this slurry actually forms a substance similar to gel 4, so the slurry has elasticity after solidification. Such elastic gel 4 has relatively good sealing performance and makes the steel pipe 2 and the concrete pipe 3 have better torsional deformation adaptability, thereby ensuring that when the geological conditions change, the pipe joints still have good waterproof sealing performance.

[0041] In the above slurry formula, the functions of each component are as follows: acrylate monomer (which can be sodium salt or potassium salt) provides a polymerization reaction matrix; ammonium persulfate is used as an initiator to control the rate of free radical polymerization; triethanolamine is used as a promoter to accelerate low-temperature reactions; N,N-methylenebisacrylamide (MBA) is used as a cross-linking agent to enhance the elasticity of gel 4 formed after the slurry solidifies; ferrous sulfate acts as a retarder to extend the operable time during grouting. Glycerol acts as a plasticizer to improve the flexibility of gel 4 formed after the slurry solidifies. Deionized water acts as a solvent.

[0042] As attached Figure 1 And attached Figure 2 As shown, the slurry includes 15-25 parts of acrylate monomer, 0.5-2 parts of ammonium persulfate, 0.1-0.5 parts of triethanolamine, 0.1-0.3 parts of N,N-methylenebisacrylamide, 0.05-0.1 parts of ferrous sulfate, 2-4 parts of glycerol, and 65-85 parts of deionized water by mass.

[0043] As attached Figure 1 And attached Figure 2 As shown, a pH regulator is also included, and the pH regulator is used to maintain the pH of the entire slurry between 8 and 9.

[0044] The specific pH adjuster is used to maintain the reaction stability when the slurry solidifies. The specific pH adjuster includes but is not limited to sodium bicarbonate.

[0045] As attached Figure 1 And attached Figure 2 As shown, the waterproof ring 1 is a trapezoidal waterproof ring 1, and the two waterproof rings 1 are oriented in the same direction. The purpose of the same direction is to reduce the resistance when the rigid pipe is inserted.

[0046] As attached Figure 1 And attached Figure 2 As shown, a placement groove 303 is opened at the step 301 , the bottom of the placement groove 303 is a rough wall surface, and the waterproof ring 1 is stuck in the placement groove 303 .

[0047] The placement groove 303 serves to initially fix the waterproof ring 1. First, the waterproof ring 1 is placed on the placement groove 303 of the concrete pipe 3, and then the steel pipe 2 is connected to the waterproof ring 1, so that the waterproof ring 1 is inserted into the steel pipe 2. During the process of the waterproof ring 1 being inserted into the steel pipe 2, the inner wall of the steel pipe 2 contacts the inclined plane 103, and the squeezing of the inner wall of the steel pipe 2 on the inclined plane 103 continues to increase.

[0048] The above-described embodiments only express some embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, it is still possible to modify the technical solutions recorded in the above-mentioned embodiments, or to replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for sealing a concrete pipe joint against water seepage, comprising a concrete pipe and a steel pipe, wherein a step is provided on the outer wall of the concrete pipe, the concrete pipe is matched with the steel pipe through its own step, two waterproof rings are provided between the concrete pipe and the steel pipe, and the two waterproof rings are both located at the step, characterized in that: The two waterproof rings are in a non-contact state, a rough wall surface is provided at the step of the concrete pipe, and the two waterproof rings are in contact with the rough wall surface, and grouting is performed between the two waterproof rings.

2. A method for sealing a concrete jacking pipe joint against water seepage according to claim 1, characterized in that: The grouting holes are opened on the pipe wall of the concrete pipe.

3. A method for sealing a concrete jacking pipe joint against water seepage according to claim 1, characterized in that: The waterproof ring is provided with a corrugated surface and an inclined plane, the corrugated surface is close to the rough wall surface, the inclined plane is close to the inner wall of the steel pipe, and the angle formed by the corrugated surface and the inclined plane is an acute angle.

4. A method for sealing a concrete jacking pipe joint against water seepage according to claim 3, characterized in that: The waterproof ring is provided with a groove, and the groove is located between the corrugated surface and the inclined plane.

5. A method for sealing a concrete jacking pipe joint against water seepage according to claim 1, characterized in that: The waterproof ring comprises a waterproof ring made of EPDM rubber, and the slurry comprises acrylate monomer, ammonium persulfate, triethanolamine, N,N-methylenebisacrylamide, ferrous sulfate, glycerol and deionized water.

6. A method for sealing a concrete jacking pipe joint against water seepage according to claim 5, characterized in that: The slurry includes, by mass, 15 to 25 parts of acrylate monomer, 0.5 to 2 parts of ammonium persulfate, 0.1 to 0.5 parts of triethanolamine, 0.1 to 0.3 parts of N,N-methylenebisacrylamide, 0.05 to 0.1 parts of ferrous sulfate, 2 to 4 parts of glycerol, and 65 to 85 parts of deionized water.

7. A method for sealing a concrete jacking pipe joint against water seepage according to claim 5, characterized in that: The invention also comprises a pH regulator, which is used to maintain the pH of the entire slurry between 8 and 9.

8. A method for sealing a concrete jacking pipe joint against water seepage according to claim 1, characterized in that: The waterproof ring is a trapezoidal waterproof ring, and the two waterproof rings are oriented in the same direction.

9. A method for sealing concrete jacking pipe joints against water seepage according to claim 1, characterized in that: A placement groove is provided at the step, the bottom of the placement groove is a rough wall surface, and the waterproof ring is stuck in the placement groove.

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