CN113186878A - Soft soil foundation diversion canal construction method for water taking in rivers - Google Patents
Soft soil foundation diversion canal construction method for water taking in rivers Download PDFInfo
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- CN113186878A CN113186878A CN202110575474.9A CN202110575474A CN113186878A CN 113186878 A CN113186878 A CN 113186878A CN 202110575474 A CN202110575474 A CN 202110575474A CN 113186878 A CN113186878 A CN 113186878A
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- 238000010276 construction Methods 0.000 title claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000002689 soil Substances 0.000 title claims abstract description 27
- 239000004567 concrete Substances 0.000 claims abstract description 86
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000013461 design Methods 0.000 claims abstract description 9
- 230000015271 coagulation Effects 0.000 claims description 8
- 238000005345 coagulation Methods 0.000 claims description 8
- 230000003111 delayed effect Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 241000251468 Actinopterygii Species 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims 2
- 239000007924 injection Substances 0.000 claims 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000009415 formwork Methods 0.000 abstract 1
- 238000013459 approach Methods 0.000 description 10
- 238000009412 basement excavation Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/02—Making or lining canals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
-
- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
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Abstract
The invention discloses a soft soil foundation diversion canal construction method for water taking in rivers, which comprises the following steps: 1) a soil retaining and supporting structure formed by mutually engaging the engaged cast-in-place piles is utilized; 2) the top ends of the left bank cast-in-place pile and the right bank cast-in-place pile are respectively connected into a whole by utilizing a concrete crown beam; 3) the concrete is utilized to support the left and right bank cast-in-place piles by the supporting beams to prevent soil bodies on two sides from moving inwards; 4) a traffic bridge is arranged at the top of the cast-in-place pile to form a frame structure type (crossing) aqueduct; 5) and excavating foundation pits among the cast-in-place piles, and finally constructing the template formwork concrete. The construction method of the invention realizes the construction operation method which takes up little construction space and does not need to build a temporary construction cofferdam when water is taken from the river, and utilizes the pile foundation and the traffic bridge to design and construct in a combined way, thereby having higher construction speed, shortening the construction period, being suitable for soft soil foundations, being safe and reliable and saving investment.
Description
Technical Field
The invention relates to a diversion canal construction method, in particular to a soft soil foundation diversion canal construction method for water taking in rivers.
Background
Rivers have abundant water in water resources and are widely distributed, and are often used as water supply sources for cities, industries, irrigation and the like. Because of the restrictions of various conditions such as topography, navigation, etc., a pump station or a barrage can not be directly built in a river to take water, and water needs to be firstly led out to a pool suitable for taking water or a pump station forebay through a diversion channel.
Under general conditions, if the diversion canal is adopted to take water from a river, complicated deep foundation pit excavation can be involved, the construction of a temporary construction cofferdam is complicated, the shore traffic is affected after the construction, and a traffic bridge crossing the diversion canal still needs to be newly built.
Under general conditions, the soil covering layer on the bank of the river is thick, geological conditions are poor, the foundation bearing capacity is difficult to meet the design requirements, the diversion canal and the traffic bridge are separately constructed, and a filling pile and a bridge pile are required to be arranged respectively so as to ensure that the foundation bearing capacity meets the requirements.
Disclosure of Invention
The invention aims to provide a soft soil foundation diversion canal construction method for water taking in rivers according to the defects of the prior art, the occlusive cast-in-place pile and the traffic bridge are combined, the size is simple, the occlusive cast-in-place pile and the mould bag concrete replace a retaining wall and a bottom plate of the traditional diversion canal, a combined frame structure of the occlusive cast-in-place pile and the traffic bridge is built, the technical problems of complex deep foundation pit supporting and temporary cofferdam construction are solved, and the technical effects of saving investment, shortening construction period and being simple in construction are achieved.
In order to solve the technical problems, the invention adopts the technical scheme that: a soft soil foundation diversion canal construction method for water taking in rivers comprises the following steps:
a) backfilling soil and stones of the temporary construction platform, wherein the backfilling soil and stones of the construction platform is not less than 0.92, so that the pile forming requirement of the secant pile is met;
b) constructing occlusive piles in two steps, wherein the first-step piles are plain concrete piles of ultra-retarding concrete, the second-step piles are reinforced concrete piles of common concrete, the first-step piles and the second-step piles are arranged at intervals, first-step holes are constructed, second-step holes are constructed between every two adjacent first-step holes, and the second-step piles are cut into holes before the concrete of the adjacent first-step piles is initially set;
c) arranging a concrete crown beam at the top of the secant cast-in-place pile, and arranging a concrete counter-bracing beam between the concrete crown beam at the top of the left bank secant cast-in-place pile and the concrete crown beam at the top of the right bank secant cast-in-place pile of the diversion channel;
d) excavating a foundation pit after the occlusion cast-in-place pile and the construction of the supporting beam are completed and the construction is qualified through inspection, and monitoring the displacement of the pile foundation and the side slope in the construction process;
e) laying mould bag concrete on a diversion canal base plate, wherein the construction sequence of the mould bag concrete base plate is that the mould bag concrete base plate is firstly laid down and then laid up, is firstly left and right and then arranged in the middle, is firstly arranged upstream and then arranged downstream, and is firstly arranged in a standard section and then arranged in a special-shaped section;
f) drainage blind pipes are arranged on the I-sequence piles, and a fish blocking electric grid is arranged at the inlet of the water diversion channel.
And c) arranging a concrete counter-bracing beam between the concrete crown beam at the top of the left bank secant cast-in-place pile of the diversion channel and the concrete crown beam at the top of the right bank secant cast-in-place pile, and arranging a traffic bridge between the top of the concrete crown beam at the top of the left bank secant cast-in-place pile of the diversion channel and the top of the concrete crown beam at the top of the right bank secant cast-in-place pile.
The length of the pile embedded into rock at the bottom of the second-order pile is not less than 4m, and the length of the pile entering the lower portion of an excavation face at the bottom of the first-order pile is not less than 2 m.
The delayed coagulation time of the super delayed coagulation concrete of the first-order pile is not less than 60h, the slump during dry hole pouring is 120mm +/-20 mm, and the slump during underwater pouring is 180mm +/-20 mm; the 3d strength value of the concrete is not more than 3MPa, and the final strength meets the design requirement.
After the mould bag of the mould bag concrete is filled with concrete, the allowable deviation of the top width is +/-20 mm, the deviation of the top and bottom elevations is-20-40 mm, and the unevenness of the concrete surface is not more than 5 cm; after the mould bag concrete is filled, the thickness of the concrete is measured by using a probe, the mean value of the thickness meets the design requirement, and the allowable deviation is 5-8 percent.
Arranging drainage blind pipes on the I-order piles, wherein the distance between every two adjacent drainage blind pipes is 3m, the drainage blind pipes are arranged in a staggered mode, the length is 3m, the elevation angle is 5 degrees, the surface aperture ratio and the porosity of each drainage blind pipe are 90 percent, and a layer of drainage blind pipe is wrapped outside the drainage blind pipes and is 250g/m2The geotextile.
The invention has the beneficial effects that: firstly, the combined design of the secant cast-in-place pile and the traffic bridge is adopted, so that the construction problems of separate construction of the diversion canal and the traffic bridge, complicated construction and the like are solved, the engineering quantity is optimized, the occupied area is reduced, the engineering investment is saved, and the construction period is shortened; secondly, the retaining wall of the traditional diversion channel is replaced by the secant cast-in-place pile, so that the technical problems of complex deep foundation pit support and temporary cofferdam construction are solved; and the bottom plate of the traditional diversion channel is replaced by the mould bag concrete, so that the method is strong in geological condition adaptability, capable of underwater construction, high in construction efficiency and capable of saving cost. And fourthly, the frame structure combining the secant cast-in-place pile and the traffic bridge has high integral rigidity and better controls the deformation of the foundation pit.
Drawings
Fig. 1 is a plan view of an approach canal constructed by the approach for soft soil foundation approach canal construction for water intake in rivers of the present invention.
FIG. 2 is a longitudinal sectional view of an approach canal constructed by the approach for soft soil foundation approach canal construction for water intake in rivers of the present invention.
Fig. 3 is a typical cross-sectional view of an approach canal constructed by the approach for soft soil foundation approach canal construction for water intake in rivers of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the soft soil foundation approach canal construction method for water intake in rivers of the invention comprises the following steps:
a) backfilling soil and stones of the temporary construction platform, wherein the backfilling soil and stones of the construction platform 13 is not less than 0.92, so that the pile forming requirement of the secant pile is met;
b) constructing occlusive piles in two steps, wherein the first-step piles are plain concrete piles of ultra-retarding concrete, the second-step piles are reinforced concrete piles of common concrete, the first-step piles and the second-step piles are arranged at intervals, first-step holes are constructed, second-step holes are constructed between every two adjacent first-step holes, and the second-step piles are cut into holes before the concrete of the adjacent first-step piles is initially set;
c) the top of the secant cast-in-place pile 1 is provided with a concrete crown beam 2, and a concrete counter-bracing beam 3 is arranged between the concrete crown beam at the top of the left bank secant cast-in-place pile and the concrete crown beam at the top of the right bank secant cast-in-place pile of the diversion canal;
d) after the construction of the secant cast-in-place pile 1 and the support beam 3 is completed and the construction is qualified through inspection, foundation pit excavation is carried out, and the displacement of the pile foundation and the side slope is monitored in the construction process;
e) laying a mould bag concrete 4 on a diversion canal base plate, wherein the construction sequence of the mould bag concrete base plate is that the mould bag concrete base plate is firstly laid down and then laid up, is firstly left and right and then arranged in the middle, is firstly arranged upstream and then arranged downstream, and is firstly arranged on a standard section and then arranged on a special-shaped section;
f) a drainage blind pipe 6 is arranged on the first-order pile, and a fish blocking electric fence 8 is arranged at the inlet of the water diversion canal.
And c) arranging a concrete counter-bracing beam 3 between the concrete crown beam at the top of the left bank secant cast-in-place pile of the diversion channel and the concrete crown beam at the top of the right bank secant cast-in-place pile, and arranging a traffic bridge 5 between the top of the concrete crown beam at the top of the left bank secant cast-in-place pile of the diversion channel and the top of the concrete crown beam at the top of the right bank secant cast-in-place pile.
The length of the pile embedded into rock at the bottom of the second-order pile is not less than 4m, and the length of the pile entering the lower portion of an excavation face at the bottom of the first-order pile is not less than 2 m.
The delayed coagulation time of the super delayed coagulation concrete of the first-order pile is not less than 60h, the slump during dry hole pouring is 120mm +/-20 mm, and the slump during underwater pouring is 180mm +/-20 mm; the 3d strength value of the concrete is not more than 3MPa, and the final strength meets the design requirement.
After the mould bags of the mould bag concrete 4 are filled with concrete, the allowable deviation of the top width is +/-20 mm, the deviation of the top and bottom elevations is-20-40 mm, and the unevenness of the concrete surface is not more than 5 cm; after the mould bag concrete is filled, the thickness of the concrete is measured by using a probe, the mean value of the thickness meets the design requirement, and the allowable deviation is 5-8 percent.
Drainage blind pipes 6 are arranged on the I-order piles, the distance between every two adjacent drainage blind pipes is 3m, the drainage blind pipes are arranged in a staggered mode and are 3m long, the elevation angle is 5 degrees, and the drainage blind pipes6 the surface opening rate and the porosity are 90 percent, and a layer of the coating is coated outside the coating and is 250g/m2The geotextile.
In the figure, 7 is a concrete guardrail pier, 9 is a river channel, 10 is a river bank, 11 is an original ground, 12 is an existing road, and 14 is a water pool. The occlusion cast-in-place pile 1 meets the requirements of occlusion type pile arranging technical standards (JGJ/T396-2018), the delayed coagulation time of super delayed coagulation concrete of a plain concrete pile of the occlusion cast-in-place pile 1 is not less than 60h, the slump during dry hole pouring is preferably 120mm +/-20 mm, and the slump during underwater pouring is preferably 180mm +/-20 mm; the 3d strength value of the concrete should not be more than 3 MPa.
The following example illustrates the construction according to the following steps: firstly, backfilling soil and stones of a temporary construction platform; then, constructing an occlusive pile, and constructing in two procedures, wherein the first-procedure pile adopts a plain concrete pile of ultra-retarding concrete, the second-procedure pile adopts a reinforced concrete pile of common concrete, the first-procedure pile and the second-procedure pile are arranged at intervals, the first-procedure hole is constructed firstly, the second-procedure hole is constructed between two adjacent first-procedure holes, and the second-procedure pile is cut to form a hole before the concrete of the adjacent first-procedure pile is initially set; then, constructing a crown beam, a butt-bracing beam and a traffic bridge; the excavation of the foundation pit is carried out after the construction of the secant cast-in-place pile, the bracing beam and the traffic bridge is finished and the acceptance is qualified, and the displacement of the pile foundation and the side slope is monitored in the construction process; the construction sequence of the mould bag concrete bottom plate is that the bottom is firstly arranged and then the top is arranged, the left and right are firstly arranged and then the middle is arranged, the upstream is firstly arranged and then the downstream is arranged, and the standard section is firstly arranged and then the special-shaped section is arranged.
The above examples 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 scope of the present invention is not limited by the examples, i.e., the equivalent changes or modifications made in the spirit of the present invention disclosed are still within the scope of the present invention.
Claims (6)
1. A soft soil foundation diversion canal construction method for water taking in rivers is characterized by comprising the following steps:
a) backfilling soil and stones of the temporary construction platform, wherein the backfilling soil and stones of the construction platform (13) is not less than 0.92, so that the pile forming requirement of the secant pile is met;
b) constructing occlusive piles in two steps, wherein the first-step piles are plain concrete piles of ultra-retarding concrete, the second-step piles are reinforced concrete piles of common concrete, the first-step piles and the second-step piles are arranged at intervals, first-step holes are constructed, second-step holes are constructed between every two adjacent first-step holes, and the second-step piles are cut into holes before the concrete of the adjacent first-step piles is initially set;
c) a concrete crown beam (2) is arranged at the top of the secant cast-in-place pile (1), and a concrete counter-bracing beam (3) is arranged between the concrete crown beam at the top of the left bank secant cast-in-place pile and the concrete crown beam at the top of the right bank secant cast-in-place pile;
d) after the construction of the secant cast-in-place pile (1) and the bracing beam (3) is completed and the construction is qualified, excavating a foundation pit, and monitoring the displacement of a pile foundation and a side slope in the construction process;
e) laying mould bag concrete (4) on a diversion canal bottom plate, wherein the construction sequence of the mould bag concrete bottom plate is that the mould bag concrete bottom plate is arranged from bottom to top, the mould bag concrete bottom plate is arranged from left to right and then from the middle, the mould bag concrete bottom plate is arranged from upstream to downstream, and the mould bag concrete bottom plate is arranged from a standard section to a special-shaped section;
f) a drainage blind pipe (6) is arranged on the I-sequence pile, and a fish blocking electric fence (8) is arranged at the inlet of the water diversion canal.
2. A soft soil foundation penstock construction method for taking water from rivers according to claim 1, characterized in that step c) further comprises arranging a concrete counter-supporting beam (3) between the concrete crown beam at the top of the left bank secant cast-in-place pile and the concrete crown beam at the top of the right bank secant cast-in-place pile of the penstock, and then arranging a traffic bridge (5) between the top of the concrete crown beam at the top of the left bank secant cast-in-place pile and the top of the concrete crown beam at the top of the right bank secant cast-in-place pile of the penstock.
3. A soft soil foundation penstock construction method for taking water from rivers according to claim 1, wherein the pile length of the bottom of the second-order pile embedded in the rock is not less than 4m, and the pile length of the bottom of the first-order pile entering below the excavated surface is not less than 2 m.
4. A soft soil foundation aqueduct construction method for getting water from rivers according to claim 1, wherein the delayed coagulation time of the i-sequence pile ultra delayed coagulation concrete is not less than 60h, the slump during dry hole injection is 120mm ± 20mm, and the slump during underwater injection is 180mm ± 20 mm; the 3d strength value of the concrete is not more than 3MPa, and the final strength meets the design requirement.
5. The soft soil foundation aqueduct construction method for water taking in rivers according to the claim 1, characterized in that after the mould bag of the mould bag concrete (4) is filled with concrete, the allowable deviation of the top width is plus or minus 20mm, the deviation of the top and bottom elevations is minus 20-40 mm, and the unevenness of the concrete surface is not more than 5 cm; after the mould bag concrete is filled, the thickness of the concrete is measured by using a probe, the mean value of the thickness meets the design requirement, and the allowable deviation is 5-8 percent.
6. A soft soil foundation penstock construction method for water taking in rivers according to claim 1, characterized in that drainage blind pipes (6) are arranged on the I-sequence piles, the distance between two adjacent drainage blind pipes (6) is 3m, the drainage blind pipes are arranged in a staggered manner, the drainage blind pipes are 3m long, the elevation angle is 5 degrees, the surface aperture ratio and the porosity of the drainage blind pipes (6) are 90%, and a layer of 250g/m is coated outside2The geotextile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575474.9A CN113186878A (en) | 2021-05-25 | 2021-05-25 | Soft soil foundation diversion canal construction method for water taking in rivers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575474.9A CN113186878A (en) | 2021-05-25 | 2021-05-25 | Soft soil foundation diversion canal construction method for water taking in rivers |
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| CN113186878A true CN113186878A (en) | 2021-07-30 |
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| CN202110575474.9A Pending CN113186878A (en) | 2021-05-25 | 2021-05-25 | Soft soil foundation diversion canal construction method for water taking in rivers |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08109629A (en) * | 1994-10-13 | 1996-04-30 | Mitsubishi Materials Corp | Construction method of structure such as channel, etc. |
| CN204435321U (en) * | 2014-12-15 | 2015-07-01 | 河南省电力勘测设计院 | A kind of steam power station water intaking open channel |
-
2021
- 2021-05-25 CN CN202110575474.9A patent/CN113186878A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08109629A (en) * | 1994-10-13 | 1996-04-30 | Mitsubishi Materials Corp | Construction method of structure such as channel, etc. |
| CN204435321U (en) * | 2014-12-15 | 2015-07-01 | 河南省电力勘测设计院 | A kind of steam power station water intaking open channel |
Non-Patent Citations (3)
| Title |
|---|
| 胡兴乐: "汾河段漫水桥方案设计比选", 《山西水利》 * |
| 陈志乐等: "双排咬合灌注桩在河道整治工程中的应用", 《水运工程》 * |
| 龚吉斌: "模袋混凝土在七星渠鸣沙段渠道砌护施工中的应用", 《住宅与房地产》 * |
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Application publication date: 20210730 |