CN114318989A - Prestressed filling roadbed construction method suitable for soft foundation soil - Google Patents
Prestressed filling roadbed construction method suitable for soft foundation soil Download PDFInfo
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- CN114318989A CN114318989A CN202210060486.2A CN202210060486A CN114318989A CN 114318989 A CN114318989 A CN 114318989A CN 202210060486 A CN202210060486 A CN 202210060486A CN 114318989 A CN114318989 A CN 114318989A
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- embankment
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- roadbed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention relates to a prestressed fill roadbed construction method suitable for soft foundation soil, which adopts cement mixing piles to reinforce roadbed foundations, wherein when an embankment is filled, a lower layer of prestressed tendons are arranged at the bottom of the embankment at certain intervals along the transverse direction of the embankment, after the embankment is formed, a plurality of layers of slope protection precast blocks are laid on the side slopes at two sides of the embankment, and two ends of the lower layer of prestressed tendons respectively penetrate through the lowest layer of precast blocks at two sides of the side slopes and are tensioned and anchored; the concrete cover plate is poured at the top of the embankment, an upper-layer prestressed tendon is arranged in the cover plate at a certain interval along the transverse direction of the embankment, two sides of the concrete cover plate are respectively poured with precast blocks on the uppermost layer of two sides of the side slope into a whole, and after the concrete of the cover plate reaches the designed strength, the upper-layer prestressed tendon is stretched to the cover plate to arch and be anchored. The side slope protection prefabricated section can prevent the side slope from collapsing, and the upper and lower layer prestressing force can resist the horizontal force after the vertical load that the embankment bore decomposes, has the dual function of firm embankment and side slope, guarantees road operation safety.
Description
Technical Field
The invention belongs to the technical field of road construction, relates to a filling roadbed structure, and particularly relates to a prestressed filling roadbed construction method under the condition of soft foundation soil.
Background
The highway subgrade is designed to be higher than the road section of the original ground, needs filling construction, is called as a embankment, is generally filled with a layer of compacted layer, and is finally assisted with pavement. When the roadbed is constructed under the condition of soft foundation soil, because the bearing capacity of the roadbed is low, the roadbed is easy to subside after being operated for a period of time, and meanwhile, the side slope of the embankment is easy to collapse, so that potential safety hazards are brought to vehicle passing.
Disclosure of Invention
The invention aims to solve the problems and provides a construction method of a filling roadbed under the condition of soft foundation soil, which can prevent roadbed settlement and side slope collapse and ensure the operation safety of roads.
The technical scheme of the invention is as follows:
a construction method of a prestressed fill roadbed suitable for soft foundation soil is characterized by comprising the following steps:
(1) and (3) foundation reinforcement: constructing a row of cement mixing piles at certain intervals along the transverse direction of the roadbed below the original ground line of the roadbed so as to enhance the bearing capacity and stability of the roadbed;
(2) filling an embankment: filling and compacting the embankment in layers; when in filling construction, a lower layer of prestressed tendons are arranged at the bottom of the embankment at certain intervals along the transverse direction of the embankment;
(3) installing a slope protection prefabricated block: after the embankment is formed, slope protection prefabricated blocks are fully paved on the side slopes on the two sides of the embankment, the slope protection prefabricated blocks are paved in multiple layers from the slope toe to the slope top according to the height of the side slope, two ends of the lower layer prestressed tendons respectively penetrate through the prefabricated blocks on the lowest layers on the two sides of the side slope, after the paving of the lowest layer slope protection prefabricated blocks is completed, the lower layer prestressed tendons are tensioned, and anchoring nuts are installed at the two ends of the lower layer prestressed tendons;
(4) pouring a roadbed cover plate: pouring a concrete cover plate on the top of the embankment, presetting a pvc pipe in the concrete at certain intervals along the transverse direction of the embankment during pouring, and penetrating upper-layer prestressed tendons in the pvc pipe; two sides of the concrete cover plate are respectively cast with the precast blocks on the uppermost layers of the two sides of the side slope into a whole;
(5) tensioning the upper prestressed tendons: and after the cover plate concrete reaches the design strength, tensioning the upper prestressed tendons until the cover plate arches, and then respectively installing anchoring nuts at two ends of the upper prestressed tendons.
The cement mixing pile is used for reducing foundation settlement, the side slope prefabricated block is used for stabilizing the embankment to prevent the side slope from collapsing, the horizontal force after the vertical load borne by the embankment is decomposed is resisted through the prestress of the top layer and the bottom layer of the embankment, the cement mixing pile has the double functions of stabilizing the embankment and the side slope, and the operation safety of roads is ensured. The side slope prefabricated section can be manufactured in a factory, the quality can be guaranteed, and the installation speed is high.
Drawings
FIG. 1 is a transverse cross-sectional view of the subgrade of the present invention;
figure 2 is a longitudinal side view of the subgrade of the invention;
FIG. 3 is a schematic plan view of a side slope protection prefabricated section;
FIG. 4 is a schematic side view of a slope protection prefabricated section;
FIG. 5 is a side view of a connection structure of a slope protection precast block;
fig. 6 is a plan view of a connection structure of the side slope protection precast block.
Detailed Description
The specific embodiment of the invention is as follows:
(1) as shown in fig. 1 and 2, before the roadbed is filled, a row of cement mixing piles 1 is firstly constructed below the original ground line of the roadbed at regular intervals along the transverse direction of the roadbed so as to enhance the bearing capacity and stability of the roadbed foundation.
The cement mixing pile is a common method for treating soft foundation in building engineering, and generally adopts cement as main curing agent, and utilizes mixing pile machine to spray cement into soil body and fully mix them, so that the cement and soil body produce a series of physical and chemical reactions to make the soft soil hardened and raise foundation strength.
During the concrete construction of the invention, two adjacent rows of cement mixing piles can be arranged in a staggered manner, and the cement mixing piles are arranged on the roadbed foundation in a plum blossom shape, so that each section of the roadbed can be reinforced as much as possible.
(2) And after the foundation is reinforced, filling the embankment 2 in layers, and filling one layer of embankment and compacting one layer. When the lowest layer of the embankment is filled, a lower layer prestressed tendon 3 is arranged at the bottom of the embankment at certain intervals along the transverse direction of the embankment, and the lower layer prestressed tendon is made of finish-rolled deformed steel bar.
(3) After the embankment is formed, slope protection prefabricated blocks 4 are fully paved on side slopes on two sides of the embankment, the slope protection prefabricated blocks are paved in multiple layers from a slope toe to a slope top according to the height of the side slope, when the bottom slope protection prefabricated blocks are paved, two ends of the lower prestressed tendons 3 penetrate through the prefabricated blocks 4 on the bottom layers of the two sides of the side slope respectively, and after the bottom slope protection prefabricated blocks are paved, the lower prestressed tendons are tensioned and anchoring nuts are installed at the two ends of the lower prestressed tendons.
The side slope protection prefabricated block can be pre-processed in a prefabricated field. Each side slope precast block 4 is of a rectangular structure, and fig. 3 and 4 show the structure of the precast block 4 arranged at the middle layer, and a notch 41 is respectively arranged at the middle of the top edge and the bottom edge of the side slope precast block. The precast block for being installed on the uppermost layer of the side slope can be provided with the notches only on the bottom edge, and the precast block for being installed on the lowermost layer of the side slope can be provided with the notches only on the top edge. At least two connecting ribs 42 are arranged in each prefabricated block along the direction vertical to the top edge and the bottom edge, the connecting ribs are made of finish rolled deformed steel bars, and the end part of each connecting rib protrudes into the groove opening for a certain length. The purpose of setting up notch and splice bar is when being convenient for install the prefabricated section on the side slope, and be connected between two adjacent prefabricated sections from top to bottom. In order to facilitate the installation of the lower prestressed tendons, a through hole is also preset on each precast block for installation at the lowest layer.
As shown in fig. 5 and 6, when the precast block 4 is laid on a slope, the notches 41 on the upper and lower adjacent precast blocks are opposite to the connecting ribs 42 in the notches, and the opposite connecting ribs in the two opposite notches are connected by the double-headed nut 5. The two ends of the lower prestressed tendon 3 respectively pass through the through holes on the precast blocks of the lowest layer of the side slopes on the two sides and penetrate through wedge-shaped cushion blocks 6, the inner side surfaces of the wedge-shaped cushion blocks are closely attached to the surfaces of the precast blocks, the outer side surfaces of the wedge-shaped cushion blocks are perpendicular to the horizontal plane, and then the lower prestressed tendon is tensioned and the anchoring nuts are installed at the two ends.
(4) After the side slope protection precast block is installed, a concrete cover plate 7 is cast in situ at the top of the embankment, a pvc pipe is preset in the concrete at certain intervals along the transverse direction of the embankment during casting, upper prestressed tendons 8 penetrate through the pvc pipe, and the upper prestressed tendons are made of finish-rolled deformed steel bars; the two sides of the concrete cover plate 7 are respectively poured with the precast blocks 4 on the uppermost layers of the two sides of the side slope into a whole.
(5) After the cover plate concrete reaches the design strength, the upper prestressed tendons 8 are tensioned to arch the cover plate, and then the anchoring nuts are respectively installed at the two ends of the upper prestressed tendons. And finishing the construction of the prestressed filling roadbed.
Furthermore, in order to prevent rainwater from corroding and soaking the embankment, after all the side slope protection prefabricated blocks are installed or after roadbed construction is completed, cement mortar can be used for plugging gaps between each notch and adjacent prefabricated blocks.
Claims (4)
1. A construction method of a prestressed fill roadbed suitable for soft foundation soil is characterized by comprising the following steps:
(1) and (3) foundation reinforcement: constructing a row of cement mixing piles at certain intervals along the transverse direction of the roadbed below the original ground line of the roadbed so as to enhance the bearing capacity and stability of the roadbed;
(2) filling an embankment: filling and compacting the embankment in layers; when in filling construction, a lower layer of prestressed tendons are arranged at the bottom of the embankment at certain intervals along the transverse direction of the embankment;
(3) installing a slope protection prefabricated block: after the embankment is formed, slope protection prefabricated blocks are fully paved on the side slopes on the two sides of the embankment, the slope protection prefabricated blocks are paved in multiple layers from the slope toe to the slope top according to the height of the side slope, two ends of the lower layer prestressed tendons respectively penetrate through the prefabricated blocks on the lowest layers on the two sides of the side slope, after the paving of the lowest layer slope protection prefabricated blocks is completed, the lower layer prestressed tendons are tensioned, and anchoring nuts are installed at the two ends of the lower layer prestressed tendons;
(4) pouring a roadbed cover plate: pouring a concrete cover plate on the top of the embankment, presetting a pvc pipe in the concrete at certain intervals along the transverse direction of the embankment during pouring, and penetrating upper-layer prestressed tendons in the pvc pipe; two sides of the concrete cover plate are respectively cast with the precast blocks on the uppermost layers of the two sides of the side slope into a whole;
(5) tensioning the upper prestressed tendons: and after the cover plate concrete reaches the design strength, tensioning the upper prestressed tendons until the cover plate arches, and then respectively installing anchoring nuts at two ends of the upper prestressed tendons.
2. The filling roadbed construction method applicable to the soft foundation soil according to claim 1, wherein: in the step (1), two adjacent rows of cement mixing piles are staggered, so that the cement mixing piles are arranged on the roadbed foundation in a plum blossom shape.
3. The filling roadbed construction method applicable to the soft foundation soil according to claim 1, wherein: the side slope protection prefabricated blocks are pre-processed in a prefabricated field, each side slope prefabricated block is of a rectangular structure, notches are respectively formed in the bottom edge of the prefabricated block on the uppermost layer, the top edge of the prefabricated block on the lowermost layer and the middles of the top edges and the bottom edges of the prefabricated blocks on the rest layers, at least two connecting ribs are arranged in each prefabricated block along the direction perpendicular to the top edge and the bottom edge, and the end part of each connecting rib protrudes into each notch for a certain length; a through hole is preset on the precast block at the lowest layer; when the precast blocks are laid on the side slope, the notches on the upper precast block and the lower precast block which are adjacent are opposite to the connecting ribs in the notches, and the opposite connecting ribs in the two opposite notches are connected through the double-headed nut; the two ends of the lower prestressed tendon respectively pass through the through holes on the precast blocks of the lowest layer of the side slopes on the two sides and penetrate through the wedge-shaped cushion blocks, the inner side surfaces of the wedge-shaped cushion blocks are closely attached to the surfaces of the precast blocks, the outer side surfaces of the wedge-shaped cushion blocks are perpendicular to the horizontal plane, and the lower prestressed tendon is anchored through nuts after being tensioned.
4. A filling roadbed construction method suitable for soft foundation soil according to claim 3, wherein: and after all the slope protection prefabricated blocks are installed, cement mortar is used for plugging gaps between each notch and the adjacent prefabricated blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210060486.2A CN114318989B (en) | 2022-01-19 | 2022-01-19 | Prestressed filling roadbed construction method suitable for soft foundation soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210060486.2A CN114318989B (en) | 2022-01-19 | 2022-01-19 | Prestressed filling roadbed construction method suitable for soft foundation soil |
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| CN114318989A true CN114318989A (en) | 2022-04-12 |
| CN114318989B CN114318989B (en) | 2023-08-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648867A (en) * | 2016-03-02 | 2016-06-08 | 杭州江润科技有限公司 | Comprehensive ecological roadbed system and construction method |
| CN205954968U (en) * | 2016-08-04 | 2017-02-15 | 四川宜宾仁铭住宅工业技术有限公司 | A strenghthened type concrete combined slab for green building |
| JP6262814B1 (en) * | 2016-08-04 | 2018-01-17 | 株式会社サムシング | Protection method for embankment slope |
| CN208815364U (en) * | 2018-07-28 | 2019-05-03 | 新疆维吾尔自治区交通规划勘察设计研究院 | One kind returning packet mode TGXG Steep Slope Embankment structure |
| CN111118969A (en) * | 2020-01-16 | 2020-05-08 | 中铁第五勘察设计院集团有限公司 | Roadbed slope protection device and railway roadbed |
| CN213539003U (en) * | 2020-08-22 | 2021-06-25 | 浙江华东工程咨询有限公司 | Highway subgrade side slope antiskid |
-
2022
- 2022-01-19 CN CN202210060486.2A patent/CN114318989B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648867A (en) * | 2016-03-02 | 2016-06-08 | 杭州江润科技有限公司 | Comprehensive ecological roadbed system and construction method |
| CN205954968U (en) * | 2016-08-04 | 2017-02-15 | 四川宜宾仁铭住宅工业技术有限公司 | A strenghthened type concrete combined slab for green building |
| JP6262814B1 (en) * | 2016-08-04 | 2018-01-17 | 株式会社サムシング | Protection method for embankment slope |
| CN208815364U (en) * | 2018-07-28 | 2019-05-03 | 新疆维吾尔自治区交通规划勘察设计研究院 | One kind returning packet mode TGXG Steep Slope Embankment structure |
| CN111118969A (en) * | 2020-01-16 | 2020-05-08 | 中铁第五勘察设计院集团有限公司 | Roadbed slope protection device and railway roadbed |
| CN213539003U (en) * | 2020-08-22 | 2021-06-25 | 浙江华东工程咨询有限公司 | Highway subgrade side slope antiskid |
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| CN114318989B (en) | 2023-08-18 |
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