CN112942411A - Reinforcing construction method for dredging retaining wall of urban landscape river - Google Patents
Reinforcing construction method for dredging retaining wall of urban landscape river Download PDFInfo
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- CN112942411A CN112942411A CN202110166533.7A CN202110166533A CN112942411A CN 112942411 A CN112942411 A CN 112942411A CN 202110166533 A CN202110166533 A CN 202110166533A CN 112942411 A CN112942411 A CN 112942411A
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- river
- retaining wall
- dredging
- urban landscape
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Revetment (AREA)
Abstract
The invention discloses a reinforcing construction method for a dredging retaining wall of an urban landscape river course, which comprises the steps of firstly arranging temporary supports on a wall body before excavating a river bottom, excavating soil bodies at the toe of the retaining wall in a segmented mode, pouring concrete continuous walls, arranging transverse U-shaped concrete supporting beams at intervals in the river course, and excavating the river course downwards after the transverse U-shaped concrete supporting beams reach 80% of design strength. And then grouting and reinforcing the retaining wall foundation, and finally removing the upper temporary support. The method is feasible in technology, simple and convenient in construction, economical and reasonable, is suitable for reinforcing the retaining wall of the urban river with narrow space in hydraulic engineering, effectively solves the problems that the overflowing capacity of the river is insufficient and retaining walls on two banks need to be reserved, can deepen the excavation of the river, improve the flood-carrying capacity of the river, can retain the retaining wall in the current situation, and does not affect buildings on the two banks.
Description
Technical Field
The invention relates to a construction method for reinforcing retaining walls of hydraulic engineering, in particular to construction for reinforcing dredging retaining walls of urban landscape river channels.
Background
The urban river is not only an important channel for urban flood control, but also an important component of an urban ecological landscape system. Along with the demand of people for good life, the treatment strength of urban landscape river channels is also continuously increased. For some narrow (10-20 m) urban riverways, river banks are limited by two sides and fixed, retaining walls on the two banks cannot be removed, and the riverways cannot be widened; on the other hand, in order to meet the flood-carrying capacity of the river channel and match with landscape improvement, the river channel can only be dredged and dug. However, urban river channels are special, the two sides of the river channels are mostly old residential areas, underground pipelines are used, and how to dredge and dig the river channels under the condition that retaining walls on the two sides of the river channels are stable and the safety of surrounding buildings is not affected is a frequently encountered problem.
Therefore, the method for reinforcing the retaining wall of the urban landscape river, which is feasible in technology, simple in process, convenient and fast in construction, economical and reasonable, has very positive practical significance.
Disclosure of Invention
The invention aims to solve the technical problems that the method for reinforcing the desilting retaining wall of the urban landscape river is feasible in technology, simple in process, convenient and fast to construct, economic and reasonable, and solves the technical problems that the space of the urban river is narrow and retaining walls on two banks are reserved.
In order to solve the technical problems, the invention adopts the technical scheme that the method for reinforcing the desilting retaining wall of the urban landscape river comprises the following steps:
1) a plurality of temporary supports are arranged between the retaining wall bodies on the two sides of the current river channel, the width of each temporary support is the same as that of the river channel, and the two ends of each temporary support are supported on the retaining wall bodies on the two opposite sides, so that the retaining walls are prevented from being unevenly settled due to subsequent construction and excavation;
2) excavating the toe part of the retaining wall to be below the designed river bottom, and pouring a concrete continuous wall along the longitudinal length of the river;
3) excavating and pouring transverse U-shaped concrete support beams at intervals in the river channel, wherein two ends of each U-shaped concrete support beam are tightly attached to the continuous wall and act together with the continuous wall to support and block a foundation at the lower part of the retaining wall;
4) excavating at intervals of the U-shaped concrete support beams to be below the elevation of the designed river bottom according to the designed longitudinal-section diagram;
5) drilling grouting holes on the continuous wall, and grouting and reinforcing the foundation of the retaining wall;
6) sequentially paving non-woven geotextile, sand gravel and gabion at the interval excavation position of the U-shaped concrete supporting beam from bottom to top, wherein the upper surface of the sand gravel is the same as the bottom elevation of the U-shaped concrete supporting beam;
7) and (5) after the concrete strength of the U-shaped concrete support beam reaches 80% of the designed strength value and grouting is carried out for 14 days, the temporary support can be detached.
The width of the river channel is not more than 20 m.
The temporary supports are arranged in a plurality of rows and columns, the vertical interval is 2-3m, and the interval is 2-3m along the river course.
The thickness of the continuous wall is 30 cm-80 cm.
The U-shaped supporting beam is 50-100 cm higher than the toe top of the retaining wall, and the bottom beam top of the U-shaped supporting beam is flush with the designed river bottom.
The U-shaped supporting beams are longitudinally arranged at intervals of 2-3 m.
The non-woven geotextile has a mass per unit area of 300g/m2The sand and pebbles have the thickness of at least 150mm and the grain diameter of 0.5-20 mm, and the top surface of the gabion 8 is flush with the designed river bottom.
The temporary support is made of steel supports, the members are steel pipes or profile steel and are connected through bolts, and the net height from the vertical support to the designed river bottom is not less than 3 m.
And the continuous wall enters a compact sandy gravel layer or a rock layer by adopting a hydraulic grab bucket type grooving machine, or adopting a rotary drilling rig matched with the hydraulic grab bucket type grooving machine, or selecting a double-wheel milling grooving machine.
And drilling grouting holes on the continuous wall, grouting and reinforcing the foundation of the retaining wall, wherein the hole pitch is 1.5-2 m, the grouting material is cement clay slurry, and the grouting pressure is not less than 0.15 mPa.
The invention has the beneficial effects that: the retaining wall solves the problem that the retaining wall is retained in the landscape lifting process of the urban river, avoids the defects that the retaining wall and a pipeline behind the wall are damaged by the traditional anchor bolt support, the foundation of a building nearby is disturbed and the like, achieves feasible technology, simple process, convenient construction, economy and reasonability, and provides guarantee for the construction safety of the urban landscape river.
Drawings
Fig. 1 is a river course plane layout diagram of the urban landscape river dredging retaining wall reinforcing construction method.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a sectional view taken along line B-B of fig. 1.
In the figure: 1-retaining wall, 2-temporary support, 3-U-shaped concrete support beam, 4-drilling grouting hole, 5-continuous wall, 6-non-woven geotextile, 7-sand pebble and 8-gabion.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, the method for reinforcing the dredging retaining wall of the urban landscape river comprises the following steps:
1) the horizontal temporary supports 2 are arranged on the wall body of the existing retaining wall 1, the temporary support structure adopts steel supports, and the members can be steel pipes, section steel and combined sections thereof, and are preferably connected by bolts. The clear height of the vertical arrangement support to the base is not preferably less than 3 m. Horizontal supports are arranged in the river channel, and the supports are firstly carried out and then the foundation of the retaining wall 1 is prevented from being disturbed by the construction of the continuous wall 5, so that the retaining wall 1 is prevented from generating uneven settlement; the width of the river channel should not be too large, and generally not exceed 20 m.
2) Excavating the toe part of the retaining wall 1 to be below the designed river bottom, and pouring a concrete continuous wall 5; the continuous wall 5 can be grooved by a hydraulic grab bucket type grooving machine, or a rotary drilling rig matched with the hydraulic grab bucket type grooving machine, or a double-wheel milling grooving machine is selected to enter a compact sandy gravel layer or a rock layer, and the minimum groove width is limited by a grooving machine.
3) In the direction perpendicular to the water flow of the river channel, locally excavating to a position below the designed river bottom, pouring a U-shaped concrete supporting beam 3, enabling two ends of the U-shaped concrete supporting beam to be tightly attached to the continuous wall 5, and supporting a foundation on the lower portion of the retaining wall 1 under the combined action of the U-shaped concrete supporting beam and the continuous wall 5; before the support beam 3 is poured, the concrete at the support points is cleaned and roughened. The top of the U-shaped supporting beam 3 is higher than the toe of the retaining wall by 50-100 cm, the bottom beam top is flush with the designed river bottom, and the spacing of the bottom beam top and the designed river bottom is 2-3 m.
4) Longitudinally cutting according to the river course design, and excavating river bottom earthwork to reach the design requirement elevation;
5) and drilling grouting holes on the continuous wall 5 to perform grouting reinforcement on the foundation of the retaining wall 1, wherein the hole pitch can be 1.5-2 m according to the design requirement. The grouting material is cement clay slurry, and the grouting pressure is not less than 0.15 mPa.
6) Then, sequentially paving a non-woven geotextile 6, a sand gravel 7 and a gabion 8 at intervals of the U-shaped support beam 3 from bottom to top, wherein the upper surface of the sand gravel 7 is as high as the bottom elevation of the U-shaped concrete support beam 3; the unit area mass of the geotextile is generally 300g/m2The thickness of the sand-gravel layer is 150mm, the particle size is generally 10-20 mm, and the thickness of the gabion is 300 mm.
7) And after the strength of the cast concrete reaches 80% of the designed strength value and grouting is carried out for 14 days, the temporary support 2 can be detached.
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the present invention shall not be limited to the embodiments, i.e. the spirit of the present invention disclosed, and equivalent changes or modifications shall still fall within the scope of the present invention.
Claims (10)
1. The method for reinforcing and constructing the dredging retaining wall of the urban landscape river is characterized by comprising the following steps of:
1) a plurality of temporary supports are arranged between the retaining wall bodies on the two sides of the current river channel, the width of each temporary support is the same as that of the river channel, and the two ends of each temporary support are supported on the retaining wall bodies on the two opposite sides, so that the retaining walls are prevented from being unevenly settled due to subsequent construction and excavation;
2) excavating the toe part of the retaining wall to be below the designed river bottom, and pouring a concrete continuous wall along the longitudinal length of the river;
3) excavating and pouring transverse U-shaped concrete support beams at intervals in the river channel, wherein two ends of each U-shaped concrete support beam are tightly attached to the continuous wall and act together with the continuous wall to support and block a foundation at the lower part of the retaining wall;
4) excavating at intervals of the U-shaped concrete support beams to be below the elevation of the designed river bottom according to the designed longitudinal-section diagram;
5) drilling grouting holes on the continuous wall, and grouting and reinforcing the foundation of the retaining wall;
6) sequentially paving non-woven geotextile, sand gravel and gabion at the interval excavation position of the U-shaped concrete supporting beam from bottom to top, wherein the upper surface of the sand gravel is the same as the bottom elevation of the U-shaped concrete supporting beam;
7) and (5) after the concrete strength of the U-shaped concrete support beam reaches 80% of the designed strength value and grouting is carried out for 14 days, the temporary support can be detached.
2. The urban landscape river dredging retaining wall reinforcing construction method according to claim 1, wherein the width of the river is not more than 20 m.
3. The urban landscape river dredging retaining wall reinforcing construction method according to claim 1, wherein the temporary supports are arranged in a plurality of rows and columns, are vertically spaced at intervals of 2-3m, and are spaced at intervals of 2-3m along a river course.
4. The urban landscape river dredging retaining wall reinforcing construction method according to claim 1, wherein the thickness of the continuous wall is 30 cm-80 cm.
5. The urban landscape river channel dredging retaining wall reinforcing construction method according to claim 1, wherein the U-shaped supporting beam is 50-100 cm higher than the toe top of the retaining wall, and the bottom beam top of the U-shaped supporting beam is flush with the designed river bottom.
6. The urban landscape river dredging retaining wall reinforcing construction method according to claim 1, wherein the U-shaped supporting beams are arranged at intervals of 2 m-3 m in the longitudinal direction.
7. The urban landscape river dredging retaining wall reinforcing construction method according to claim 1, wherein the non-woven geotextile has a mass per unit area of 300g/m2The sand and pebbles have the thickness of at least 150mm and the grain diameter of 0.5-20 mm, and the top surface of the gabion 8 is flush with the designed river bottom.
8. The urban landscape river dredging retaining wall reinforcing construction method according to claim 3, wherein the temporary supports are steel supports, the members are steel pipes or section steel, the members are connected by bolts, and the clear height from the vertical arrangement supports to the designed river bottom is not less than 3 m.
9. The urban landscape river dredging retaining wall reinforcement construction method according to claim 4, wherein the continuous wall enters a dense sandy gravel layer or a rock stratum by adopting a hydraulic grab bucket type trenching machine, or adopting a rotary drilling rig matched with the hydraulic grab bucket trenching machine, or adopting a double-wheel milling trenching method.
10. The urban landscape river dredging retaining wall reinforcing construction method according to claim 1, wherein grouting holes are drilled in the continuous wall, the retaining wall foundation is grouted and reinforced, the hole pitch is 1.5 m-2 m, cement clay slurry is adopted as grouting material, and the grouting pressure is not less than 0.15 mPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110166533.7A CN112942411A (en) | 2021-02-04 | 2021-02-04 | Reinforcing construction method for dredging retaining wall of urban landscape river |
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| CN202110166533.7A CN112942411A (en) | 2021-02-04 | 2021-02-04 | Reinforcing construction method for dredging retaining wall of urban landscape river |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100657182B1 (en) * | 2006-10-14 | 2006-12-15 | (주)정도엔지니어링 | River sand carrying away protecting facility |
| CN107299630A (en) * | 2017-08-17 | 2017-10-27 | 浙江交工集团股份有限公司 | A kind of deep ＆ thick silt matter riverbed piping lane crosses the river double steel plate pile cofferdam structure and construction method |
| CN108330903A (en) * | 2018-03-13 | 2018-07-27 | 中铁十二局集团第七工程有限公司 | Narrow river Retaining Wall Reinforcement device and reinforcement means |
| CN108951641A (en) * | 2018-07-25 | 2018-12-07 | 中国十七冶集团有限公司 | It is a kind of for the compound support method of ultra-deep pipe gallery foundation trench in water river |
| CN111042053A (en) * | 2019-12-27 | 2020-04-21 | 浙江省水利水电勘测设计院 | Permanent temporary combined retaining wall structure in urban hydraulic engineering and construction method thereof |
| CN211113444U (en) * | 2019-08-20 | 2020-07-28 | 中国电建集团华东勘测设计研究院有限公司 | Ecological protective structure of riverway bank slope under unfavorable geological conditions |
| CN111676890A (en) * | 2020-04-26 | 2020-09-18 | 中国一冶集团有限公司 | Ecological reconstruction construction method for river bottom of black and odorous water body river |
-
2021
- 2021-02-04 CN CN202110166533.7A patent/CN112942411A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100657182B1 (en) * | 2006-10-14 | 2006-12-15 | (주)정도엔지니어링 | River sand carrying away protecting facility |
| CN107299630A (en) * | 2017-08-17 | 2017-10-27 | 浙江交工集团股份有限公司 | A kind of deep ＆ thick silt matter riverbed piping lane crosses the river double steel plate pile cofferdam structure and construction method |
| CN108330903A (en) * | 2018-03-13 | 2018-07-27 | 中铁十二局集团第七工程有限公司 | Narrow river Retaining Wall Reinforcement device and reinforcement means |
| CN108951641A (en) * | 2018-07-25 | 2018-12-07 | 中国十七冶集团有限公司 | It is a kind of for the compound support method of ultra-deep pipe gallery foundation trench in water river |
| CN211113444U (en) * | 2019-08-20 | 2020-07-28 | 中国电建集团华东勘测设计研究院有限公司 | Ecological protective structure of riverway bank slope under unfavorable geological conditions |
| CN111042053A (en) * | 2019-12-27 | 2020-04-21 | 浙江省水利水电勘测设计院 | Permanent temporary combined retaining wall structure in urban hydraulic engineering and construction method thereof |
| CN111676890A (en) * | 2020-04-26 | 2020-09-18 | 中国一冶集团有限公司 | Ecological reconstruction construction method for river bottom of black and odorous water body river |
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Application publication date: 20210611 |