CN112682065A - Subway tunnel segment crack treatment method - Google Patents
Subway tunnel segment crack treatment method Download PDFInfo
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- CN112682065A CN112682065A CN202011525670.7A CN202011525670A CN112682065A CN 112682065 A CN112682065 A CN 112682065A CN 202011525670 A CN202011525670 A CN 202011525670A CN 112682065 A CN112682065 A CN 112682065A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000004593 Epoxy Substances 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 239000012634 fragment Substances 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 229910052714 tellurium Inorganic materials 0.000 claims description 3
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000012797 qualification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention belongs to the field of tunnel segment crack treatment, and particularly relates to a subway tunnel segment crack treatment method. The invention provides a subway tunnel segment crack treatment method which comprises the following steps: s1: measuring the damage condition of the duct piece, and grading according to the damage area and the damage depth of the duct piece and whether ribs are leaked or not; s2: and (3) dividing the repair categories of the duct pieces according to the positions and the grading of the duct pieces, wherein the repair categories comprise first-class repair, second-class repair and third-class repair, and S3: and repairing according to first-class repair, second-class repair and third-class repair respectively. According to the subway tunnel segment crack treatment method provided by the invention, different methods are pertinently adopted for filling according to different shapes and stress ranges of the segments and by referring to different crack conditions of the segments, the treatment method is scientific and reliable, the ground strength of the segments is ensured, the filling step can be reasonably optimized, and the materials and the construction time are saved.
Description
Technical Field
The invention belongs to the field of tunnel segment crack treatment, and particularly relates to a subway tunnel segment crack treatment method.
Background
Common defects of subway tunnels include tunnel settlement, segment cracks, tunnel water leakage and the like. For example, when the section from the Wuhan subway railway station to the Yuejian mouth station is up to 2019 and 4 months, the left line vault segment is totally provided with 117 cracks, and the maximum width of each crack is 0.24 mm; the right line vault segment is found with cracks 308, and the maximum width of the cracks is 0.78 mm.
Disclosure of Invention
The invention provides a subway tunnel segment crack treatment method, and provides a technical method for solving the problem, which is specially used for solving the problem.
The invention provides a subway tunnel segment crack treatment method which comprises the following steps:
s1: measuring the damage condition of the duct piece, grading according to the damage area, the damage depth and whether rib leakage occurs, wherein the grading comprises A, B, C, D four types, wherein the A type standard is that the damage area of the duct piece is 0.07m2Above, the damage depth is more than 30mm or rib leakage; the B standard is that the damaged area of the pipe piece is 0.07m2Above, the damage depth is less than 30 mm; the C-type standard is that the damaged area of the duct piece does not reach 0.07m2The damage depth is more than 30mm or ribs are leaked; the D-type standard is that the damaged area of the duct piece does not reach 0.07m2The damage depth is less than 30 mm;
s2: dividing the repair categories of the duct pieces according to the positions and the grades of the duct pieces, wherein the repair categories comprise first-class repair, second-class repair and third-class repair, and when the duct pieces are positioned at the top arch part, A, B, C, D four-class grades are all first-class repair; when the duct piece is positioned at the waist parts at two sides, A, B, C type three grading is type two repair, and type D grading is type three repair;
s3: the repair is performed according to a first class repair, a second class repair and a third class repair, respectively, wherein the first class repair comprises the following steps,
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) performing interface treatment on the damaged surface;
3) repairing the structural adhesive;
wherein the second type of repair comprises the following steps;
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) drilling upwards at the cracked part of the segment by adopting a 10mm drill bit along an angle of about 30 degrees, wherein the drilling depth is about 5cm, and the distance between holes is about 20 crm-25 cm;
3) removing surface debris, and planting bars by using phi 8 steel bars;
4) coating an interface agent on the damaged surface;
5) filling epoxy mortar for repairing;
the three types of repair comprise the following steps:
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) removing tellurium chips on the surface, and coating an interface agent on the damaged surface;
3) filling the epoxy mortar for repairing.
As a further optimization of the invention, the method also comprises the step of detecting the entity intensity after the second-class repair and the third-class repair.
As a further optimization of the invention, a structural adhesive inspection step is included prior to a type of repair.
As a further optimization of the invention, the arc angle of the segment at the top arch part is in the range of 100 degrees.
As a further optimization of the invention, the arc angle of the pipe piece positioned at the waist parts at the two sides is in the range of 85 degrees.
According to the subway tunnel segment crack treatment method provided by the invention, different methods are pertinently adopted for filling according to different shapes and stress ranges of the segments and by referring to different crack conditions of the segments, the treatment method is scientific and reliable, the ground strength of the segments is ensured, the filling step can be reasonably optimized, and the materials and the construction time are saved.
Drawings
Fig. 1 is a schematic view of the present invention for crack grouting.
Detailed Description
As shown in FIG. 1, the width of the crack in FIG. 1 is greater than 0.2mm, and water is present. The present embodiment takes into account the problems of structural safety, durability, etc., and deals with the duct piece that has chipping and breakage. According to the actual situation of the tunnel, the damaged part of the pipe piece is divided into three parts, namely a 100-degree range of the vault part of the tunnel, a 90-degree range of the bottom track bed part of the tunnel arch and a range of about 85 degrees of two waist parts of the tunnel (namely the vault part to the bottom part of the tunnel arch). The repair measures need to be considered separately for different sites.
The damaged grade of section of jurisdiction is according to its damaged area, damaged degree of depth and whether leak the muscle and confirm, and the grade division is as follows:
| grade of damage | Standard of merit |
| Class A | The damaged area of the pipe piece is more than 0.07m2, the damaged depth is more than 30mm or ribs are leaked |
| Class B | The damaged area of the pipe piece is more than 0.07m2, and the damaged depth is less than 30mm |
| Class C | The damaged area of the pipe piece does not reach 0.07m2, and the damaged depth is more than 30mm or ribs are leaked |
| Class D | The damaged area of the pipe piece does not reach 0.07m2, and the damaged depth is less than 30mm |
The division of the segment repair category is divided according to the damaged part and the damaged grade, and the division is as follows:
(1) concrete measures for repair
One type of repair construction steps:
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) performing interface treatment on the damaged surface;
3) the repair of the structural adhesive is filled, and the performance of the structural adhesive is shown in the following table:
| serial number | Item | Index (I) |
| 1 | Tensile strength (Mpa) | ≥40 |
| 2 | Compressive strength (Mpa) | ≥65 |
| 3 | Bending strength (Mpa) | ≥50 |
| 4 | Shear strength (Mpa) | ≥15 |
| 5 | Modulus of elasticity (Mpa) | ≥2500 |
| 6 | Positive tensile bond strength (Mpa) | ≥30 |
| 7 | Initial setting time (Min) | ≤20 |
| 8 | Final setting time (h) | ≤2 |
| 9 | Elongation (%) | ≥1.3 |
And a second type of repair construction step:
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) drilling upwards at the cracked part of the segment by adopting a 1Omm drill bit along an angle of about 30 degrees, wherein the drilling depth is about 5cm, and the distance between holes is about 20 cm-25 cm;
3) removing surface debris, and planting bars by using phi 8 steel bars;
4) coating an interface agent on the damaged surface;
5) filling the epoxy mortar for repairing.
Three types of repair construction steps:
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) removing tellurium chips on the surface, and coating an interface agent on the damaged surface;
3) filling the epoxy mortar for repairing.
(2) Requirements for repair materials
The filling material for the damaged part of the duct piece adopts epoxy mortar, the epoxy mortar is required to reach higher strength in a short time, and the performance indexes refer to the following standards: 2h is more than or equal to 20 Mpa; 1d is more than or equal to 30 Mpa; 3d is more than or equal to 40 Mpa; 7d is more than or equal to 45 Mpa; 28d is more than or equal to 50 Mpa.
(3) Points of construction attention
1) Each repair position is numbered one by one, and account book records are made.
2) Photographing and recording each repairing position before construction, after steel bar planting and steel wire mesh hanging are completed, and after epoxy mortar repairing is completed.
3) And carrying out test block strength detection under the same condition maintenance and entity strength detection after repair on the strength of the epoxy sand slurry corresponding to the second-class repair and the third-class repair.
4) When the structural adhesive enters the field, the variety, grade, model, specification, package, identification, product qualification certificate, field inspection report and the like of the structural adhesive are inspected, initial setting time, final setting time and bonding strength of the adhesive are subjected to witness sampling and re-inspection, 1 group is sampled in each batch, and the product qualification certificate, delivery date, field inspection report and field inspection re-inspection report are inspected on the premise of confirming that product batch numbers, packages and Chinese marks are complete.
5) The repair position of the duct piece is smooth, and the sizes of the duct piece before and after repair cannot have obvious difference.
6) The repair of the duct piece requires compaction to avoid creating internal cavities.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A subway tunnel segment crack treatment method is characterized by comprising the following steps:
s1: measuring the damage condition of the duct piece, grading according to the damage area, the damage depth and whether rib leakage occurs, wherein the grading comprises A, B, C, D four types, wherein the A type standard is that the damage area of the duct piece is 0.07m2Above, the damage depth is more than 30mm or rib leakage; the B standard is that the damaged area of the pipe piece is 0.07m2Above, depth of damageLess than 30 mm; the C-type standard is that the damaged area of the duct piece does not reach 0.07m2The damage depth is more than 30mm or ribs are leaked; the D-type standard is that the damaged area of the duct piece does not reach 0.07m2The damage depth is less than 30 mm;
s2: dividing the repair categories of the duct pieces according to the positions and the grades of the duct pieces, wherein the repair categories comprise first-class repair, second-class repair and third-class repair, and when the duct pieces are positioned at the top arch part, A, B, C, D four-class grades are all first-class repair; when the duct piece is positioned at the waist parts at two sides, A, B, C type three grading is type two repair, and type D grading is type three repair;
s3: the repair is performed according to a first class repair, a second class repair and a third class repair, respectively, wherein the first class repair comprises the following steps,
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) performing interface treatment on the damaged surface;
3) repairing the structural adhesive;
wherein the second type of repair comprises the following steps;
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) drilling upwards at the cracked part of the segment by adopting a 10mm drill bit along an angular direction of 30 degrees, wherein the drilling depth is about 5cm, and the distance between holes is about 20 crm-25 cm;
3) removing surface debris, and planting bars by using phi 8 steel bars;
4) coating an interface agent on the damaged surface;
5) filling epoxy mortar for repairing;
the three types of repair comprise the following steps:
1) firstly, knocking out concrete fragments of which the cracked parts do not fall or have cracks;
2) removing tellurium chips on the surface, and coating an interface agent on the damaged surface;
3) filling the epoxy mortar for repairing.
2. The subway tunnel segment crack treatment method as claimed in claim 1, further comprising a step of solid strength detection after the second-type repair and the third-type repair.
3. The method of claim 1, further comprising the step of structural adhesive inspection prior to a type of repair.
4. The subway tunnel segment crack treatment method as claimed in claim 1, wherein the segment arc angle at the crown portion is in the range of 100 °.
5. The subway tunnel segment crack treatment method as claimed in claim 1, wherein the segment arc angle at the waist portions of both sides is in the range of 85 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011525670.7A CN112682065B (en) | 2020-12-22 | 2020-12-22 | Subway tunnel segment crack treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011525670.7A CN112682065B (en) | 2020-12-22 | 2020-12-22 | Subway tunnel segment crack treatment method |
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| Publication Number | Publication Date |
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| CN112682065A true CN112682065A (en) | 2021-04-20 |
| CN112682065B CN112682065B (en) | 2024-04-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002188396A (en) * | 2000-12-20 | 2002-07-05 | East Japan Railway Co | Tunnel repairing method, and tunnel repairing block |
| CN101008314A (en) * | 2007-01-26 | 2007-08-01 | 同济大学 | Tunnel lining segment and preparation method thereof |
| CN102979536A (en) * | 2012-12-11 | 2013-03-20 | 上海市基础工程有限公司 | Construction method for tunnel segment repair and reinforcement |
| CN103643965A (en) * | 2013-12-16 | 2014-03-19 | 上海市基础工程集团有限公司 | Repair and reinforcement construction methods for segments in formed tunnel |
| CN111608687A (en) * | 2020-06-01 | 2020-09-01 | 盾构及掘进技术国家重点实验室 | Pipe sheet repairing construction method |
| CN111997656A (en) * | 2020-08-28 | 2020-11-27 | 盐城工学院 | Preparation method of shield tunnel forming segment damage repairing structure |
-
2020
- 2020-12-22 CN CN202011525670.7A patent/CN112682065B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002188396A (en) * | 2000-12-20 | 2002-07-05 | East Japan Railway Co | Tunnel repairing method, and tunnel repairing block |
| CN101008314A (en) * | 2007-01-26 | 2007-08-01 | 同济大学 | Tunnel lining segment and preparation method thereof |
| CN102979536A (en) * | 2012-12-11 | 2013-03-20 | 上海市基础工程有限公司 | Construction method for tunnel segment repair and reinforcement |
| CN103643965A (en) * | 2013-12-16 | 2014-03-19 | 上海市基础工程集团有限公司 | Repair and reinforcement construction methods for segments in formed tunnel |
| CN111608687A (en) * | 2020-06-01 | 2020-09-01 | 盾构及掘进技术国家重点实验室 | Pipe sheet repairing construction method |
| CN111997656A (en) * | 2020-08-28 | 2020-11-27 | 盐城工学院 | Preparation method of shield tunnel forming segment damage repairing structure |
Non-Patent Citations (1)
| Title |
|---|
| 郭悦宝;: "盾构管片碎裂成因及修补技术措施", 铁路技术创新, no. 03, 30 June 2017 (2017-06-30), pages 87 - 91 * |
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| CN112682065B (en) | 2024-04-26 |
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