CN111411610A - Structure and method for fixing copper water seal between new and old concrete - Google Patents
Structure and method for fixing copper water seal between new and old concrete Download PDFInfo
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- CN111411610A CN111411610A CN202010329116.5A CN202010329116A CN111411610A CN 111411610 A CN111411610 A CN 111411610A CN 202010329116 A CN202010329116 A CN 202010329116A CN 111411610 A CN111411610 A CN 111411610A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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Abstract
A structure and a method for fixing copper water stop between new and old concrete mainly comprise the following steps: step (1), shallow carving grooves are formed in the surface of old concrete; step (2), arranging expansion bolt holes in the shallow grooves; step (3), coating epoxy base liquid in the shallow groove; step (4), smearing a lower epoxy daub bonding layer on the surface of the epoxy base liquid; step (5), installing a copper water stop sheet on the surface of the lower epoxy daub bonding layer, and fixing the copper water stop by adopting an expansion bolt and a pressing strip; step (6), smearing an upper epoxy daub layer on the surface of the copper water stop; and (7) smearing epoxy base liquid on the surface of the upper epoxy daub, sealing by adopting a dry and hard mortar protective layer, and naturally curing. And (8) pouring new concrete on the surface of the dry and hard mortar protective layer. The structure and the method for fixing the copper water stop between the new concrete and the old concrete can obviously improve the construction efficiency and reduce the damage to the old concrete structure.
Description
Technical Field
The invention relates to the field of concrete water stop, in particular to a structure and a method for fixing copper water stop between new and old concrete.
Background
In the concrete structure of hydraulic and hydroelectric engineering, such as diversion tunnel, retaining dam, sluice, water delivery tunnel, etc., in order to realize the design requirements of structure seepage prevention, leakage prevention, load deformation adaptation, shock absorption and buffering, etc., the current common technical measures are to arrange concrete grooves at the construction joints, deformation joints, etc., embed copper water stop sheets in the grooves, and then fill and fix the copper water stop sheets with new concrete or asphalt. On one hand, the method needs to dig deep grooves on the old concrete base surface, and has high labor intensity, large consumption and long labor time; on the other hand, the bonding strength between the new concrete or asphalt filling layer and the copper water stop is not high, and the risk of interlayer falling and damage is caused under the action of a higher water head. In addition, in the roof arch construction, new concrete or asphalt is filled into the concrete trough with the downward opening, which is troublesome in construction.
For the old concrete structure, the cutting difficulty is high due to the existence of the steel bars, and the old concrete structure is seriously damaged in the process of cutting the deep groove to form a base plane; new concrete or asphalt is filled in the concrete deep groove, so that the quality cannot be guaranteed, and the material has shrinkage characteristics.
Therefore, how to simplify the copper sheet water stopping structure and the construction process thereof on the premise of ensuring the water stopping effect becomes a key problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a structure and a method for fixing copper water stop between new and old concrete, which can simplify a copper sheet water stop structure and a construction process thereof on the premise of ensuring the water stop effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a structure for fixing copper water stop between new and old concrete comprises a shallow groove, wherein a copper water stop sheet is arranged in the shallow groove, and the copper water stop sheet is arranged on a lower epoxy daub bonding layer and locked through an expansion bolt; the lower part of the copper water stop sheet and the expansion bolt are fixedly sealed through the upper epoxy cement adhesive layer, and a new concrete layer is poured on the surface of the upper epoxy cement adhesive layer.
The copper water stop sheet is of an L type structure, the total width of the copper water stop sheet is 30 cm-60 cm, the thickness of the copper water stop sheet is 1.2 mm-2.5 mm, one side of the copper water stop sheet is longitudinally arranged in the shallow notch groove, the other side of the copper water stop sheet extends out from the middle of the old concrete section, and the length of the copper water stop sheet extending out of the shallow notch groove is 12 cm-25 cm.
A method for fixing copper water seal between new and old concrete comprises the following steps:
step (1), arranging shallow notches (1) on an old concrete surface;
step (2), punching holes in an array mode at the bottom of the shallow groove (1) and installing expansion bolt (4) holes;
step (3), uniformly coating epoxy base liquid on the bottom of the shallow groove (1) and naturally drying for a period of time;
step (4), uniformly coating the epoxy daub on the bottom of the shallow carving groove (1), compacting and leveling to form a lower epoxy daub bonding layer (3);
step (5), installing a copper water stop sheet (2) on the lower epoxy daub bonding layer (3), flattening a steel bar (7) on the surface, installing an expansion bolt (4), and tightening a nut (8);
after the copper water stop sheet (2) is installed, smearing an upper epoxy daub layer (5) on the surface of the copper water stop to form an upper epoxy daub bonding layer (5), and fixedly sealing the lower part of the copper water stop sheet (2) and the expansion bolt (4) by the upper epoxy daub bonding layer (5);
step (7), smearing epoxy base liquid on the surface of the upper epoxy daub bonding layer (5), sealing by adopting a dry and hard mortar (9) protective layer, and naturally curing for 3-5 days;
and (8) pouring a new concrete layer (6) on the surface of the dry and hard mortar (9) protective layer.
In the step (1), the cross section of the shallow groove is trapezoidal, the depth of the shallow groove is 2 cm-10 cm, and the bottom width is 15 cm-50 cm.
In the step (1), for the construction project which does not form the old concrete surface, the base surface of the precast belt shallow groove can be adopted.
In the step (3), the thickness of the epoxy base solution layer is 0.5 mm-1.0 mm, and the natural air drying time is 40 min-90 min.
In the step (4), the thickness of the lower epoxy daub bonding layer is 5 mm-3 cm.
In the step (5), the installation of the copper water stop sheet is required to be completed within 4 hours after the lower epoxy daub bonding layer is filled, and before the copper water stop sheet is installed, the plane concave-convex treatment is carried out on the intersection part of the copper water stop sheet and the newly poured concrete surface, so that the copper water stop sheet is not easy to be misplaced and empty when in contact with the newly poured concrete.
In the step (6), the thickness of the upper epoxy daub bonding layer is 1.0 cm-3 cm.
In the step (7), the thickness of the dry hard mortar protective layer is 5.0 cm-8.0 cm.
The epoxy daub is CW series epoxy daub.
The invention relates to a structure and a method for fixing copper water seal between new and old concrete, which have the following technical effects:
1) by adopting the epoxy daub as the bonding material, the bonding strength is high (the dry bonding between 28d and concrete is more than 4.0MPa or the cohesive failure of concrete), and the compressive strength is high (the compressive strength of 28d is more than 95 MPa), so that the comprehensive mechanical property of the water stop structure can be improved, and the water stop effect is ensured.
2) The common copper water stop installation process needs to dig a concrete deep groove (generally not less than 40cm wide and × cm deep and 40cm deep), is high in chiseling difficulty and low in construction efficiency, damages old concrete, and is poor in later pouring concrete or mortar vibration compactness, particularly a top arch part, while the application can reduce the construction difficulty, improve the construction efficiency, reduce damage to the old concrete and further simplify the construction process flow by forming a shallow groove (the width of the trapezoidal shallow groove is 15 cm-40 cm, and the depth of the trapezoidal shallow groove is 2.0 cm-10 cm) and implementing an epoxy cement adhesive layer and a pre-shrinking mortar protective layer in the shallow groove in a layered mode.
3) To the top arch position, the cooperation of preshrinking mortar and epoxy mortar is used, and the flexible concrete of pouring after avoiding or the mortar technical problem that the compactness is poor that vibrates guarantees not to hang when the top arch is under construction, can fill closely knit, the operation of being convenient for.
4) The installation of adopting to flatten billet and bolt to the copper sealing-up piece is fixed, satisfies the construction of the arbitrary working face of copper sealing-up piece, has reduced the top stagnant water structure construction degree of difficulty greatly, has ensured simultaneously that the stagnant water structure receives the shearing dislocation that concrete structure stress strain changes and bring and has taken place concrete and sealing-up piece and break away from, the technical problem that the stagnant water effect that brings weakens. Therefore, the construction is convenient, and the purpose of enhancing the water stopping effect can be achieved.
5) The copper water stop sheet is bonded and fixed by adopting the epoxy daub with high seepage-proofing grade and frost-resisting grade, and the integrity of the water stop structure and the service life can be improved compared with the conventionally adopted concrete and asphalt materials.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: shallow notch groove 1, copper waterstop piece 2, lower floor's epoxy clay adhesive linkage 3, expansion bolts 4, upper epoxy clay adhesive linkage 5, new concrete layer 6, flatten billet 7, nut 8, dry and hard mortar 9.
Detailed Description
As shown in figure 1, the structure for fixing the copper water stop between the new concrete and the old concrete comprises a shallow groove 1 with a trapezoidal cross section, wherein an L-type copper water stop sheet 2 is arranged in the shallow groove 1, the copper water stop sheet 2 is arranged on a lower epoxy cement adhesive layer 3 and locked by an expansion bolt 4, a flattened steel bar 7 and a nut 8, and an upper epoxy cement adhesive layer 5 is sealed by dry and hard mortar 9, a lower horizontal part of the copper water stop sheet 2 and the expansion bolt 4 are sealed by an upper epoxy cement adhesive layer 5, the surface of the upper epoxy cement adhesive layer 5 is sealed by the dry and hard mortar 9, and a new concrete layer 6 is poured on the surface of the dry and hard mortar 9.
A method for fixing copper water seal between new and old concrete comprises the following steps:
(1) and (2) treating a base surface, namely arranging a shallow notch 1 on a formed old concrete surface, wherein the depth H1 of the trapezoid shallow notch 1 is 2-10 cm, the bottom width L1 is 15-50 cm, cleaning floating dust and fragments on the surface of the notch by using high-pressure water after the notch is finished to ensure that the base surface is basically flat, and pre-casting a standard base surface with shallow slots in the old concrete pouring process for the old concrete surface which is not formed, wherein the size of the standard base surface is as above, and the corresponding arrangement of reinforcing steel bars and the pouring template structure need to be correspondingly adjusted, so that the old concrete surface can be effectively prevented from being disturbed and damaged by copper water stop construction.
(2) And (3) paying off and punching, namely paying off and punching in a rectangular distribution mode according to two rows and multiple lines, wherein the row spacing is L2 =5 cm-10 cm, the line spacing is 1M, after punching is finished, floating ash is cleaned, and expansion bolts 4 are installed, wherein the specifications of the expansion bolts 4 are M12, and the lengths of the expansion bolts are 5 cm-9 cm.
(3) Coating epoxy base liquid: the epoxy base solution A, B (CW710 series epoxy daub) is prepared by mixing the following two components in a mass ratio of 1: 0.4 mixing and mechanically stirring for 2-4 min. After being stirred uniformly, the coating is evenly coated at the bottom of the trapezoidal groove, and the thickness of the coating is 0.5 mm-1.0 mm.
(4) Filling an epoxy daub bonding layer: after the epoxy base liquid is brushed for 40-90 min, the epoxy daub A, B comprises two components according to the mass ratio of 1: (0.2-0.5), uniformly scraping the epoxy daub on the bottom of the trapezoidal groove after 3-5 min, compacting and leveling, wherein the thickness of the lower epoxy daub bonding layer 3 is 5-3 cm.
(5) Installation of a copper water stop sheet: after the lower epoxy daub bonding layer 3 is leveled, flattening steel bars and tightening bolts are adopted within 4h to complete the installation and fixation of the copper water stop sheet 2 on the old concrete surface, and before the copper water stop sheet 2 is required to be installed, the intersection part of the copper water stop sheet 2 and the newly poured concrete surface is subjected to plane concave-convex treatment, so that the copper water stop sheet 2 is not easy to generate dislocation and void when being in contact with the newly poured concrete.
(6) Coating an epoxy daub outer coating: after the copper water stop sheet 2 is installed, epoxy daub is smeared to form an upper epoxy daub bonding layer 5, and the thickness of the upper epoxy daub bonding layer 5 is 1.0-3 cm.
(7) Sealing and maintaining: and (3) smearing epoxy base liquid on the surface of the upper epoxy cement adhesive layer 5, sealing by using a dry and hard mortar 9 (the mass ratio of cement to medium sand to water is 1: 1-3: 0.3-0.4) protective layer, wherein the thickness of the dry and hard mortar protective layer 9 is 5.0-8.0 cm, and naturally curing for 3-5 days.
(8) And (3) pouring new concrete: and pouring new concrete on the surface of the dry and hard mortar.
The epoxy daub is CW series epoxy daub, and has the main properties that: the 28d compressive strength is more than 90MPa, the 28d tensile strength is more than 13MPa, and the dry bonding strength between the 28d and concrete is more than 4.0MPa (or the concrete is damaged), so that the comprehensive mechanical property and durability of the water stop structure can be improved.
The copper water stop sheet is of a T2 type red copper and L type structure, the total width is 30 cm-60 cm, the thickness is 1.2 mm-2.5 mm, one side of the copper water stop sheet is longitudinally arranged in the middle of the section of the carved trapezoidal groove and is installed and fixed by epoxy cement inner bonding and outer bolt anchoring, the other side of the copper water stop sheet extends outwards from the middle of the section of the old concrete, and the length L3 is 12 cm-25 cm.
The traditional water stopping method is a deep groove cutting mode, a water stopping sheet is buried in the deep groove cutting mode, then concrete is backfilled, the problem of contact between new concrete and old concrete also exists, compared with an L type water stopping structure, only a permeation channel is changed (the permeation channel is prolonged), and a good water stopping effect cannot be achieved.
Although the existing processes adopt epoxy glue, the epoxy glue is deeply grooved, and no epoxy glue is layered. The layering progressive transition between new and old concrete creates space for the adaptability between new and old materials, namely a transition layer, and the allowable elastic deformation space is large.
Example 1:
selecting a side wall part of a grouting open cut of a certain hydropower station, chiseling a shallow groove 1 with the depth of 4.0cm, the length of 2.0M, the surface width of 50cm and the bottom width of 40cm in old concrete, cleaning floating dust and loose covering on the surface by using high pressure water after chiseling the old concrete, ensuring that the base surface of the shallow groove 1 is flat, then airing, setting out and punching according to rectangular distribution, wherein the holes are divided into two rows and a plurality of lines, the row interval is 10cm and the line interval is 1M, cleaning floating ash after punching, installing an M12 expansion bolt 4 with the length of 9cm, mixing and mechanically stirring two components of epoxy base liquid A, B for 3min according to the mass ratio of 10: 4, then uniformly coating epoxy base liquid with the thickness of 0.5mm on the old concrete, mixing and mechanically stirring for 4.0min after the epoxy base liquid is coated for 50min, uniformly coating and filling the epoxy cement on the base surface, leveling, adhering and compacting the epoxy cement with the epoxy cement for 50min, adhering two components of epoxy cement A, B for mixing and installing a flat cement for 4.54, immediately installing a water-stop sheet, and installing a copper sheet for 2.2.3, and immediately installing a water-stop, and tightly covering a copper sheet, and installing a copper sheet for 2.2.2.4.
The technical parameters of the new and old concrete prepared by the invention are as follows: C25W12F 200.
The technical parameters of the epoxy daub prepared by the invention are as follows: the 28d compressive strength is 98.6MPa, the 28d tensile strength is 14.8MPa, the dry bonding strength of the 28d and concrete is 4.7MPa, and the wet bonding strength of the 28d and concrete is 3.5 MPa.
Example 2:
selecting a bottom plate part of a grouting horizontal hole of a certain hydropower station, chiseling a shallow groove 1 with the depth of 3.5cm, the length of 2.0M, the surface width of 50cm and the bottom width of 40cm in old concrete, cleaning floating dust and loose covering on the surface by using high pressure water after chiseling the old concrete, ensuring that the base surface of the shallow groove 1 is flat, then airing, setting out and punching according to rectangular distribution, wherein the holes are divided into two rows and a plurality of lines, the row interval is 10cm and the line interval is 1M, cleaning floating ash after punching, installing an M12 expansion bolt 4 with the length of 9cm, mixing and mechanically stirring two components of epoxy base liquid A, B for 3min according to the mass ratio of 10: 4, then uniformly coating 0.5mm of epoxy base liquid on the old concrete, mixing and mechanically stirring for 4.0min according to the mass ratio of 10: 3 after the epoxy base liquid is coated for 50min, uniformly coating the epoxy base liquid, filling the epoxy cement in the epoxy cement A, B for 4.0min according to the mass ratio of 10: 3, then uniformly coating, filling and compacting the epoxy cement in the old concrete, compacting, installing a water-proof cement adhesive layer, fixing, installing a copper sheet, installing a water-proof sheet, and installing a copper sheet covering process of 2.4.4, immediately installing a copper sheet, and installing a copper sheet for 2.7.4.4.
The technical parameters of the new and old concrete prepared by the invention are as follows: C25W12F 200.
The technical parameters of the epoxy daub prepared by the invention are as follows: the 28d compressive strength is 98.6MPa, the 28d tensile strength is 14.8MPa, the dry bonding strength of the 28d and concrete is 4.7MPa, the wet bonding strength of the 28d and concrete is 3.5MPa, and the frost resistance grade is F250.
Example 3:
selecting a top arch part of a grouting horizontal tunnel of a hydropower station, chiseling a shallow groove 1 with the depth of 3.0cm, the length of 1.0M, the surface width of 50cm and the bottom width of 40cm in old concrete, cleaning floating dust and loose covering on the surface by using high pressure water after chiseling the old concrete, ensuring that the base surface of the shallow groove 1 is flat, then airing, setting out and punching according to rectangular distribution, wherein the holes are arranged in two rows and a plurality of lines, the row interval is 10cm, the line interval is 50 cm., then cleaning floating ash, installing an M12 expansion bolt 4 with the length of 9cm, mixing and mechanically stirring two components of epoxy base liquid A, B for 3min according to the mass ratio of 10: 4, then uniformly brushing 0.7mm of epoxy base liquid on the old concrete, after finishing brushing 45min by using the epoxy base liquid, mixing and mechanically stirring the two components of epoxy cement A, B for 3.5min according to the mass ratio, then uniformly brushing and filling the epoxy cement into the old base surface, compacting the epoxy cement with the thickness of 1.0.0.0.56, immediately installing and fixing the epoxy cement, installing and installing a water-filled into a plain copper sealing layer, and immediately installing a sealing and curing a plain cement layer, and installing a plain steel bar with the epoxy cement for 2.5 d, and finishing the sealing, and covering the sealing, and sealing the sealing process of a plain cement, and sealing the copper bar, and sealing the.
The technical parameters of the new and old concrete prepared by the invention are as follows: C25W12F 200.
The technical parameters of the epoxy daub prepared by the invention are as follows: the 28d compressive strength is 98.6MPa, the 28d tensile strength is 14.8MPa, the dry bonding strength of the 28d and concrete is 4.7MPa, the wet bonding strength of the 28d and concrete is 3.5MPa, and the frost resistance grade is F250.
Claims (10)
1. The utility model provides a structure of fixed copper stagnant water between new and old concrete which characterized in that: the waterproof structure comprises a shallow notch groove (1), wherein a copper water stop sheet (2) is arranged in the shallow notch groove (1), and the copper water stop sheet (2) is arranged on a lower epoxy daub bonding layer (3) and locked by an expansion bolt (4); the lower part of the copper water stop sheet (2) and the expansion bolt (4) are fixedly sealed through an upper epoxy cement bonding layer (5), and a new concrete layer (6) is sealed and poured on the surface of the upper epoxy cement bonding layer (5) through dry and hard mortar (9).
2. The structure for fixing the copper water stop between the old concrete and the new concrete according to claim 1, wherein the copper water stop sheet (2) is of an L type structure, the total width is 30 cm-60 cm, the thickness is 1.2 mm-2.5 mm, one side of the copper water stop sheet is longitudinally arranged in the shallow groove (1), the other side of the copper water stop sheet extends outwards from the middle of the section of the old concrete, and the length of the copper water stop sheet extending out of the shallow groove (1) is 12 cm-25 cm.
3. A method for fixing copper water stop between new and old concrete is characterized in that: the method comprises the following steps:
step (1), arranging shallow notches (1) on an old concrete surface;
step (2), punching holes in an array mode at the bottom of the shallow notch groove (1) and installing expansion bolt holes;
step (3), uniformly coating epoxy base liquid on the bottom of the shallow groove (1) and naturally drying for a period of time;
step (4), uniformly coating the epoxy daub on the bottom of the shallow carving groove (1), compacting and leveling to form a lower epoxy daub bonding layer (3);
step (5), installing a copper water stop sheet (2) on the lower epoxy daub bonding layer (3), flattening steel bars (7) on the surface, installing expansion bolts (4), and tightening nuts (8);
after the copper water stop sheet (2) is installed, smearing an upper epoxy daub layer (5) on the surface of the copper water stop to form an upper epoxy daub bonding layer (5), and fixedly sealing the lower part of the copper water stop sheet (2) and the expansion bolt (4) by the upper epoxy daub bonding layer (5);
step (7), smearing epoxy base liquid on the surface of the upper epoxy daub bonding layer (5), sealing by adopting a dry and hard mortar (9) protective layer, and naturally curing for 3-5 days;
and (8) pouring a new concrete layer (6) on the surface of the dry and hard mortar (9) protective layer.
4. A method of securing a copper seal between old and new concrete as claimed in claim 3, wherein: in the step (1), the cross section of the shallow groove (1) is trapezoidal, the depth of the shallow groove (1) is 2 cm-10 cm, and the bottom width is 15 cm-50 cm.
5. A method of securing a copper seal between old and new concrete as claimed in claim 3, wherein: in the step (1), for the construction project which does not form the old concrete surface, the base surface of the precast strip shallow notch groove (1) can be adopted.
6. A method of securing a copper seal between old and new concrete as claimed in claim 3, wherein: in the step (3), the thickness of the epoxy base solution layer is 0.5 mm-1.0 mm, and the natural air drying time is 40 min-90 min.
7. A method of securing a copper seal between old and new concrete as claimed in claim 3, wherein: in the step (4), the thickness of the lower epoxy daub bonding layer (3) is 5 mm-3 cm.
8. A method of securing a copper seal between old and new concrete as claimed in claim 3, wherein: in the step (5), the installation of the copper water stop sheet (2) is required to be completed within 4 hours after the lower epoxy daub bonding layer (3) is filled, and before the copper water stop sheet (2) is installed, the intersection part of the copper water stop sheet (2) and the newly poured concrete surface is subjected to plane concave-convex treatment, so that the copper water stop sheet (2) is not easy to be misplaced and void when being in contact with the newly poured concrete.
9. A method of securing a copper seal between old and new concrete as claimed in claim 3, wherein: in the step (6), the thickness of the upper epoxy daub bonding layer (5) is 1.0 cm-3 cm.
10. A method of securing a copper seal between old and new concrete as claimed in claim 3, wherein: in the step (7), the thickness of the dry hard mortar protective layer (9) is 5 cm-10 cm.
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| CN202010329116.5A CN111411610A (en) | 2020-04-23 | 2020-04-23 | Structure and method for fixing copper water seal between new and old concrete |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981904A (en) * | 2021-11-02 | 2022-01-28 | 湖北省水利水电规划勘测设计院 | Water stopping installation structure and method between new concrete and old concrete |
| CN114541331A (en) * | 2022-01-29 | 2022-05-27 | 中国葛洲坝集团第二工程有限公司 | Copper sheet water stop construction method |
| CN116084274A (en) * | 2023-01-05 | 2023-05-09 | 湖南省高速公路集团有限公司 | Bridge guardrail heightening structure and construction transformation method |
-
2020
- 2020-04-23 CN CN202010329116.5A patent/CN111411610A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981904A (en) * | 2021-11-02 | 2022-01-28 | 湖北省水利水电规划勘测设计院 | Water stopping installation structure and method between new concrete and old concrete |
| CN114541331A (en) * | 2022-01-29 | 2022-05-27 | 中国葛洲坝集团第二工程有限公司 | Copper sheet water stop construction method |
| CN116084274A (en) * | 2023-01-05 | 2023-05-09 | 湖南省高速公路集团有限公司 | Bridge guardrail heightening structure and construction transformation method |
| CN116084274B (en) * | 2023-01-05 | 2023-12-05 | 湖南省高速公路集团有限公司 | Bridge guardrail heightening structure and construction transformation method |
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