CN209760245U - Multistage supporting construction of pier foundation ditch - Google Patents
Multistage supporting construction of pier foundation ditch Download PDFInfo
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- CN209760245U CN209760245U CN201821657431.5U CN201821657431U CN209760245U CN 209760245 U CN209760245 U CN 209760245U CN 201821657431 U CN201821657431 U CN 201821657431U CN 209760245 U CN209760245 U CN 209760245U
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- 238000010276 construction Methods 0.000 title claims abstract description 67
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 104
- 239000010959 steel Substances 0.000 claims abstract description 104
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 37
- 239000002689 soil Substances 0.000 claims abstract description 35
- 230000002787 reinforcement Effects 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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- Bridges Or Land Bridges (AREA)
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Abstract
The utility model provides a pier foundation pit multistage supporting structure, which comprises a pier excavation deep foundation pit supporting structure positioned on the inner layer, a foundation pit slope top construction road reinforcing structure positioned on the middle layer, and a double-row steel sheet pile cofferdam structure positioned on the outer layer; the support structure for the deep foundation pit excavated by the pier adopts a support form of 'steel sheet piles, steel pipe supports and jet grouting piles', and is used for ensuring the safety of the construction of an underground structure and the construction environment around the foundation pit; the foundation pit slope top construction road reinforcing structure adopts the jet grouting pile to reinforce the foundation and is used for construction vehicle operation and passive soil body area reinforcement; the double-row steel sheet pile cofferdam structure is used for separating water and blocking sand; the utility model has the advantages that: the technical scheme provided by the utility model has reasonable structural design and high reliability; the anti-seepage effect is achieved, and the safety and the stability are high; easy to be carried out and applied, and high in practicability and applicability.
Description
Technical Field
The utility model relates to a pier foundation ditch engineering field especially relates to a pier foundation ditch multistage supporting construction.
Background
with the rapid development of social economy and science and technology, the bridge construction in China is rapidly advanced, and many large-span bridges span large rivers and even straits, thereby becoming the life lines of Chinese transportation. The bridge pier is the foundation of the bridge, and the excavation of the foundation pit of the bridge pier is of great importance to the safety of the bridge. However, some pier foundation pits are positioned at the seabed or the river bottom or the river bank or the coast with complicated engineering geological conditions, which brings serious challenges to the construction of the pier foundation pits; with the continuous innovative development of the foundation construction of the bridge, people have higher and higher requirements on the seepage prevention, safety, stability and the like of the pier foundation pit support, and the new challenge is brought to the construction of the pier foundation pit. Therefore, the pier foundation pit supporting structure meeting the requirements has important significance.
disclosure of Invention
In order to solve the problem, the utility model provides a pier foundation ditch multistage supporting construction, include: the construction method comprises the following steps that a deep foundation pit supporting structure is excavated by piers located on the inner layer, a foundation pit slope top construction road reinforcing structure located on the middle layer and a double-row steel sheet pile cofferdam structure located on the outer layer are constructed;
The pier excavates a deep foundation pit supporting structure for ensuring the safety of underground structure construction and the construction environment around the foundation pit; the support structure for the deep foundation pit excavated by the pier comprises a single row of steel sheet piles, steel pipe supports and jet grouting piles; the steel pipe supports are positioned between the single-row steel sheet piles and used for supporting the single-row steel sheet piles on two sides, and the supporting points are positioned at the upper ends of the single-row steel sheet piles; a row of rotary spraying piles is attached to the upper end of the outer side of the single row of steel sheet piles; forming a support body on the outer side of the steel sheet pile by the jet grouting pile, and reinforcing and supporting the single-row steel sheet pile;
The foundation pit slope top construction road reinforcing structure is used for operation of construction vehicles and reinforcement of a passive soil area; the foundation pit slope top construction road reinforcing structure comprises a slope top construction road, a soil retaining platform slope and a pit top soil retaining platform; the slope top construction road comprises a rotary jet grouting pile and a hardened layer positioned on the top of the rotary jet grouting pile; the slope top construction road adopts the jet grouting pile to carry out foundation reinforcement treatment, and a composite foundation is formed by cement paste sprayed out of the jet grouting pile, a hardened layer and inter-pile soil of the jet grouting pile; the top of the slope of the soil retaining platform is connected with the top of the pit soil retaining platform, and the bottom of the slope of the soil retaining platform is connected with the top of the slope construction road;
The double-row steel sheet pile cofferdam structure surrounds the periphery of the foundation pit slope top construction road reinforcing structure in a double-row steel sheet pile mode, maintains the whole pier foundation pit and is used for water isolation and sand and soil blocking; the double-row steel sheet pile cofferdam structure comprises two rows of steel sheet piles, tie bars and transverse channel steel wales; and transverse channel steel wales are respectively arranged on the outer sides of the two rows of steel sheet piles, the two rows of steel sheet piles are connected through tie bars, two ends of each tie bar are anchored on the transverse channel steel wales, and the tie bars are locked by the transverse channel steel wales.
Further, in the deep foundation pit supporting structure excavated by the pier, double-spliced steel enclosing purlins are arranged on the single row of steel sheet piles; the steel pipe supports comprise angle braces and opposite braces and support single-row steel plate piles.
Furthermore, in the foundation pit slope top construction road reinforcing structure, when the foundation stabilization treatment is carried out on the slope top construction road by adopting the rotary jet piles, the rotary jet piles are arranged in a quincunx shape, and the distance between the rotary jet piles is suitable for reinforcing the pier foundation pit.
Further, in the road reinforced structure is under construction at foundation ditch hillside top, adopt the jet grouting stake to carry out full hall formula reinforcement to staying native platform slope.
Furthermore, in the foundation pit slope top construction road reinforcing structure, the soil platform remained at the top of the pit is reinforced in a grid mode by adopting the jet grouting piles, a passive region reinforcing body is formed after reinforcement, and the anti-overturning performance and the stability of the double-row steel sheet pile cofferdam structure are improved.
Furthermore, in the construction of the road reinforcing structure on the top of the foundation pit, bidirectional reinforcing bars are required to be added in the process of forming the composite foundation, and the composite foundation is used for reinforcing the pier foundation pit.
Further, in the double-row steel sheet pile cofferdam structure, the steel sheet piles comprise steel sheet piles at the water-facing side and steel sheet piles at the inner side; the single-row channel steel with the transverse through length is the transverse channel steel waist beam.
The utility model provides a beneficial effect that technical scheme brought is: the structure is reasonable in design and high in reliability; the anti-seepage effect is achieved, and the safety and the stability are high; easy to be carried out and applied, and high in practicability and applicability.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
Fig. 1 is a plan view of a pier foundation pit multistage supporting structure in an embodiment of the present invention;
Fig. 2 is a sectional view of a pier foundation pit multistage supporting structure in the embodiment of the present invention;
Fig. 3 is a schematic view of the deep foundation pit supporting structure excavated by the pier located at the inner layer in the embodiment of the present invention;
FIG. 4 is a schematic view of a road reinforcing structure for construction of a slope top of a foundation pit located in an intermediate layer in the embodiment of the present invention;
fig. 5 is a schematic diagram of the double-row steel sheet pile cofferdam structure located on the outer layer in the embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the utility model provides a pier foundation ditch multistage support method and structure.
referring to fig. 1 and fig. 2, fig. 1 is a plan view of a pier foundation pit multistage supporting structure in an embodiment of the present invention, fig. 2 is a sectional view of a pier foundation pit multistage supporting structure in an embodiment of the present invention, and as can be seen from fig. 1 and fig. 2, a pier foundation pit multistage supporting structure includes: the method comprises the following steps that a deep foundation pit supporting structure 1 is excavated by piers located on the inner layer, foundation pit slope top construction road reinforcing structures 2, 3-1 and 4-1 located on the middle layer, and a double-row steel sheet pile cofferdam structure 5 located on the outer layer; the support structure for the pier excavation deep foundation pit adopts a support form of 'steel sheet piles, steel pipe supports and jet grouting piles' and is used for ensuring the safety of underground structure construction and the construction environment around the foundation pit, and the specific structure is shown in figure 3; the foundation pit slope top construction road reinforcing structure adopts the jet grouting piles to reinforce the foundation, is used for reinforcing the operation of construction vehicles and passive soil body areas, and has the specific structure shown in figure 4; the double-row steel sheet pile cofferdam structure is used for separating water and blocking sand and soil, and the specific structure is shown in figure 5. The three-stage support structure system of the pier foundation pit is tightly connected to form a multi-stage support system.
Referring to fig. 3, fig. 3 is a schematic view of a deep foundation pit supporting structure excavated by piers located in an inner layer according to an embodiment of the present invention, and the deep foundation pit supporting structure excavated by piers is used for ensuring safety of underground structure construction and a construction environment around a foundation pit; the support structure for the deep foundation pit excavated by the pier comprises 1-2 rows of steel sheet piles, 1-1 steel pipe supports and 1-3 jet grouting piles; the steel pipe supports 1-1 are positioned between the single-row steel sheet piles 1-2 and used for supporting the single-row steel sheet piles 1-2 on two sides, and the supporting points are positioned at the upper ends of the single-row steel sheet piles; the single-row steel sheet pile 1-2 is used for supporting the whole pier foundation pit three-level supporting structure, and a row of jet grouting piles 1-3 are attached to the upper end of the outer side of the single-row steel sheet pile 1-2; the rotary jet grouting piles 1-3 form a steel sheet pile outer side support body, cement paste is sprayed into a soil body through nozzles of the rotary jet grouting piles, and a continuously lapped cement reinforcing body is formed with a slope top construction road 2 in the foundation pit slope top construction road reinforcing structure in the middle layer; the single-row steel sheet pile 1-2 is a foundation pit supporting structure, a double-spliced steel enclosing purlin is arranged on the single-row steel sheet pile 1-2, and the steel pipe support 1-1 comprises an angle support and a counter support and supports the single-row steel sheet pile; the steel sheet piles and the steel pipe supports meet the standard requirements of technical regulations for supporting foundation pits of buildings (JGJ 120-2012).
Referring to fig. 4, fig. 4 is a schematic view of a foundation pit slope top construction road reinforcing structure located in the middle layer in the embodiment of the present invention, and the foundation pit slope top construction road reinforcing structure is used for operation of construction vehicles and reinforcement of a passive soil area; the foundation pit slope top construction road reinforcing structure comprises a slope top construction road 2, a soil retaining platform slope 3-1 and a pit top soil retaining platform 4-1; the slope top construction road 2 comprises a rotary jet grouting pile 2-1 and a hardened layer 2-2 positioned at the pile top of the rotary jet grouting pile 2-1; the slope top construction road 2 is subjected to foundation reinforcement treatment by adopting the rotary jet grouting piles 2-1, the rotary jet grouting piles 2-1 are arranged in a quincunx shape, and the distances among the rotary jet grouting piles are proper and used for reinforcing pier foundation pits; through cement paste sprayed by the jet grouting pile 2-1, the hardened layer 2-2 and inter-pile soil of the jet grouting pile 2-1 form a composite foundation, so that the bearing capacity of a soil body is increased, safe passing of construction vehicles is facilitated, and the soil pressure of a deep foundation pit supporting structure excavated by a pier located at the inner layer is reduced; in the process of forming the composite foundation, bidirectional reinforcing bars are required to be added, and the composite foundation reinforces a pier foundation pit; the slope ratio of the soil remaining platform slope 3-1 is taken as 1:1 in the embodiment, the top of the soil remaining platform slope 3-1 is connected with the pit top soil remaining platform 4-1, the bottom of the soil remaining platform slope 3-1 is connected with the top construction road 2, and the soil remaining platform slope 3-1 is reinforced in a full-space manner by adopting the rotary jet grouting pile 2-1; carrying out grid type reinforcement on the pit top soil-retaining platform 4-1 by adopting the rotary jet grouting pile 2-1; after reinforcement, the soil remaining platform slope 3-1 and the pit top soil remaining platform 4-1 form a passive area reinforcement body, and the overturning resistance and the stability of the double-row steel sheet pile cofferdam structure positioned on the outer layer are improved.
Referring to fig. 5, fig. 5 is a schematic view of a double-row steel sheet pile cofferdam structure located at the outer layer in the embodiment of the present invention, the double-row steel sheet pile cofferdam structure surrounds the road reinforcing structure for the construction of the slope top of the foundation pit located at the middle layer in the form of double-row steel sheet piles, maintains the whole pier foundation pit, blocks water and sand, and increases the stability of the foundation pit; the double-row steel sheet pile cofferdam structure comprises 5-1 parts of steel sheet piles, 5-2 parts of tie bars and 5-3 parts of transverse channel steel wales; the outer sides of the two rows of steel sheet piles are respectively provided with a single row of transverse through long channel steel as transverse channel steel wales 5-3, the two rows of steel sheet piles are connected through tie bars 5-2, two ends of each tie bar 5-2 are anchored on the transverse channel steel wales 5-3, and the transverse channel steel wales lock the tie bars 5-2; the steel sheet piles 5-1 comprise steel sheet piles at the water-facing side and steel sheet piles at the inner side and are used for isolating water and blocking sand; wherein, the shape, the steel type, the length and the distance of the double rows of steel sheet piles all meet the requirements of the design guide rule of the cofferdam of the hydraulic and hydroelectric engineering.
The utility model has the advantages that: the technical scheme provided by the utility model has reasonable structural design and high reliability; the anti-seepage effect is achieved, and the safety and the stability are high; easy to be carried out and applied, and high in practicability and applicability.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. the utility model provides a multistage supporting construction of pier foundation ditch which characterized in that: the method comprises the following steps: the construction method comprises the following steps that a deep foundation pit supporting structure is excavated by piers located on the inner layer, a foundation pit slope top construction road reinforcing structure located on the middle layer and a double-row steel sheet pile cofferdam structure located on the outer layer are constructed;
The pier excavates a deep foundation pit supporting structure for ensuring the safety of underground structure construction and the construction environment around the foundation pit; the support structure for the deep foundation pit excavated by the pier comprises a single row of steel sheet piles, steel pipe supports and jet grouting piles; the steel pipe supports are positioned between the single-row steel sheet piles and used for supporting the single-row steel sheet piles on two sides, and the supporting points are positioned at the upper ends of the single-row steel sheet piles; a row of rotary spraying piles is attached to the upper end of the outer side of the single row of steel sheet piles; forming a support body on the outer side of the steel sheet pile by the jet grouting pile, and reinforcing and supporting the single-row steel sheet pile;
the foundation pit slope top construction road reinforcing structure is used for operation of construction vehicles and reinforcement of a passive soil area; the foundation pit slope top construction road reinforcing structure comprises a slope top construction road, a soil retaining platform slope and a pit top soil retaining platform; the slope top construction road comprises a rotary jet grouting pile and a hardened layer positioned on the top of the rotary jet grouting pile; the hardened layer and the inter-pile soil of the jet grouting pile form a composite foundation through cement paste sprayed out of the jet grouting pile; the top of the slope of the soil retaining platform is connected with the top of the pit soil retaining platform, and the bottom of the slope of the soil retaining platform is connected with the top of the slope construction road;
the double-row steel sheet pile cofferdam structure surrounds the periphery of the foundation pit slope top construction road reinforcing structure in a double-row steel sheet pile mode, maintains the whole pier foundation pit and is used for water isolation and sand and soil blocking; the double-row steel sheet pile cofferdam structure comprises two rows of steel sheet piles, tie bars and transverse channel steel wales; and transverse channel steel wales are respectively arranged on the outer sides of the two rows of steel sheet piles, the two rows of steel sheet piles are connected through tie bars, two ends of each tie bar are anchored on the transverse channel steel wales, and the tie bars are locked by the transverse channel steel wales.
2. The pier foundation pit multistage supporting structure of claim 1, wherein: in the deep foundation pit supporting structure excavated by the pier, double-spliced steel enclosing purlins are arranged on the single-row steel sheet piles; the steel pipe supports comprise angle braces and opposite braces and support single-row steel plate piles.
3. The pier foundation pit multistage supporting structure of claim 1, wherein: in the foundation pit slope top construction road reinforced structure, when adopting the jet grouting pile to carry out foundation stabilization treatment to the slope top construction road, the jet grouting pile becomes the quincunx and arranges, and the interval between the jet grouting pile is suitable for reinforcing the pier foundation pit.
4. The pier foundation pit multistage supporting structure of claim 1, wherein: in the road reinforced structure of foundation ditch hillside top construction, adopt and spout the stake soon and carry out full hall formula reinforcement to staying native platform slope.
5. The pier foundation pit multistage supporting structure of claim 1, wherein: in the foundation pit slope top construction road reinforcing structure, the rotary jet grouting piles are adopted to carry out grid type reinforcement on the pit top soil retaining platform, a passive region reinforcing body is formed after reinforcement, and the anti-overturning performance and the stability of the double-row steel sheet pile cofferdam structure are improved.
6. The pier foundation pit multistage supporting structure of claim 1, wherein: in the construction of the road reinforcing structure on the top of the foundation pit, bidirectional reinforcing bars are required to be added in the process of forming the composite foundation, and the composite foundation is used for reinforcing the pier foundation pit.
7. The pier foundation pit multistage supporting structure of claim 1, wherein: in the double-row steel sheet pile cofferdam structure, the steel sheet piles comprise steel sheet piles at the water-facing side and steel sheet piles at the inner side; the single-row channel steel with the transverse through length is the transverse channel steel waist beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821657431.5U CN209760245U (en) | 2018-10-12 | 2018-10-12 | Multistage supporting construction of pier foundation ditch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821657431.5U CN209760245U (en) | 2018-10-12 | 2018-10-12 | Multistage supporting construction of pier foundation ditch |
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| Publication Number | Publication Date |
|---|---|
| CN209760245U true CN209760245U (en) | 2019-12-10 |
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| CN201821657431.5U Expired - Fee Related CN209760245U (en) | 2018-10-12 | 2018-10-12 | Multistage supporting construction of pier foundation ditch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109706936A (en) * | 2018-10-12 | 2019-05-03 | 武汉市市政建设集团有限公司 | A kind of bridge pier foundation pit multistage support structure |
-
2018
- 2018-10-12 CN CN201821657431.5U patent/CN209760245U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109706936A (en) * | 2018-10-12 | 2019-05-03 | 武汉市市政建设集团有限公司 | A kind of bridge pier foundation pit multistage support structure |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |