CN115821949A - Support system and support method for existing high and steep slope in narrow space - Google Patents
Support system and support method for existing high and steep slope in narrow space Download PDFInfo
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- CN115821949A CN115821949A CN202211430761.1A CN202211430761A CN115821949A CN 115821949 A CN115821949 A CN 115821949A CN 202211430761 A CN202211430761 A CN 202211430761A CN 115821949 A CN115821949 A CN 115821949A
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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
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention provides a support system and a support method for an existing high and steep side slope in a narrow space. The supporting method comprises the following steps: constructing a cast-in-place pile; constructing a transfer beam, a rib column and a soil retaining plate; after backfilling the wall in layers, premixing the self-flowing cement soil; curing the cement soil; and (5) performing anchor cable construction and maintenance of the anchoring body until the premixed fluid state cement soil is backfilled to the designed elevation and the anchor cable construction is finished. And tensioning all the anchor cables for the second time.
Description
Technical Field
The invention relates to a side slope supporting method, in particular to a method for supporting an existing high and steep side slope in a narrow space.
Background
With the continuous development of urban construction, high-quality soil and stone materials are used as indispensable building materials, the price in the city is continuously improved, and the condition of illegal mining is caused to form a steep artificial side slope. The artificially formed high and steep slope brings great potential safety hazard and needs to be supported.
When a building or a functional area exists at the top or the bottom of a side slope, the site often does not have the condition of back pressure or slope cutting due to the narrow operation space. And the slope is directly supported, and the stability can not meet the requirement due to the lack of support of the high and steep slope after the mining, so that great potential safety hazard exists in the construction process.
Disclosure of Invention
The invention aims to solve the technical problem of providing a supporting system and a supporting method for an existing high and steep side slope in a narrow space, which can reserve enough safe construction space under the condition of the narrow space by taking measures of carrying out supporting structure construction far away from an existing slope body, backfilling premixed flow state cement soil behind a wall and the like, ensure the backfilling compactness behind the supporting structure and fulfill the aim of supporting the existing high and steep side slope on the premise of ensuring the construction safety.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention firstly provides a support system for an existing high and steep side slope in a narrow space, which comprises an anchor-pull type pile plate retaining wall arranged in front of a far slope body, wherein the anchor-pull type pile plate retaining wall is arranged between the high and steep side slope and an existing functional area of a slope toe, and premixed fluid cement soil is backfilled between the anchor-pull type pile plate retaining wall and a slope surface line of the existing high and steep side slope;
the anchor draws formula pile slab barricade includes and keeps off native board, rib post, conversion roof beam, filling beam and anchor rope, the filling beam sets up below the toe ground, the conversion roof beam is connected rib post and filling beam set up at the toe subaerial, it sets up between rib post and premixed flow state soil cement to keep off native board, the anchor rope slant runs through the anchor draws formula pile slab barricade with backfill premixed flow state soil cement, and stretch into in the existing steep side slope.
Furthermore, the horizontal distance between the anchor-pull type pile plate retaining wall and the slope surface line of the existing high and steep side slope is 3-6 m.
Furthermore, the designed compressive strength of the premixed flow state cement soil behind the supporting system is more than or equal to 1MPa.
The supporting structure system mainly comprises an anchor-pull type pile plate retaining wall arranged far away from the front of a slope body and premixed fluid cement soil backfilled behind the wall. The anchoring-pulling type pile plate retaining wall is arranged after 3-6 m of the existing slope surface, and enough safe construction space is reserved. The underground part of the anchoring-pulling type pile plate retaining wall is a drilled pile, the ground position is provided with a conversion beam, and the overground part is a cast-in-place reinforced concrete rib column.
The invention also provides a construction method of the support system, which comprises the following specific steps:
(1) Constructing a cast-in-place pile between a toe of an existing high-steep slope and an existing functional area of the toe;
(2) Constructing a transfer beam, a rib column and a soil retaining plate above the cast-in-place pile;
(3) And after the structural strength of the supporting and retaining wall reaches 80% of the design strength, backfilling the wall in layers and then premixing the flowing cement soil.
(4) And (5) stopping backfilling when backfilling is carried out to a position 1m above each anchor cable, and maintaining the cement soil, wherein the maintaining time is not less than 7 days, and the strength of the maintained cement soil is not less than 80% of the designed strength.
In the invention, a plurality of anchor cables are arranged in parallel, and the distance between the anchor cables is 3-4 meters.
(5) And constructing the anchor cable and maintaining the anchor body, and once tensioning the anchor cable after the anchor body reaches 80% of the designed strength, wherein the tensioning design prestress locking value is 50%.
(7) And (4) stretching all the anchor cables for the second time, and designing a prestress locking value for the rest 50% of the stretched anchor cables.
And backfilling the retaining wall by using premixed flow state cement soil, wherein the designed compressive strength is more than or equal to 1MPa.
The invention has the beneficial effects that: according to the invention, through measures of carrying out supporting structure construction far away from the existing slope body, backfilling premixed flow state cement soil behind a wall and the like, enough safe construction space can be reserved under the condition of a narrow space, the backfilling compactness at the rear part of the supporting structure is ensured, and the purpose of completing supporting of the existing high and steep slope is achieved on the premise of ensuring the construction safety.
Drawings
FIG. 1 is a raw state diagram of the present invention.
Fig. 2 is a schematic view of a state of a first step of the present invention.
FIG. 3 is a schematic view showing a state of a second step of the present invention.
FIG. 4 is a schematic view showing a state of a third step in the present invention.
FIG. 5 is a schematic view showing a state of a fourth step in the present invention.
FIG. 6 is a schematic view showing a state of a fifth step in the present invention.
Fig. 7 is a completion state diagram of the present invention.
Reference numbers in the figures: the method comprises the steps of providing an existing high and steep slope surface 100, an existing slope toe functional area 200, an existing slope top functional area 300, a slope toe ground 400, an anchor-pull type pile plate retaining wall 500, an original slope surface line 600, an excavated slope body 700, a cast-in-place pile 1, a transfer beam 2, a rib column 3, a soil retaining plate 4, premixed self-flowing cement soil 5 and an anchor cable 6.
Detailed Description
FIG. 1 is a raw state diagram of the present invention.
In order that those skilled in the art will better understand and realize the technical solutions of the present invention, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings, it should be understood that the embodiments are only specific illustrations of one or more embodiments of the present invention, and should not be construed as limiting the present invention.
Example 1, see figures 1-7.
The embodiment provides a supporting method for an existing high and steep slope in a narrow space, which aims to build a supporting system for the existing high and steep slope in the narrow construction space shown in fig. 1, and the specific construction method of the supporting system comprises the following steps:
the first process step: as shown in fig. 2, a cast-in-place pile 1 is constructed between the toe of the existing high-steep slope 100 and the toe existing functional area 200, the cast-in-place pile 1 is arranged below the ground between the toe of the existing high-steep slope 100 and the toe existing functional area 200 and is flush with the toe ground, and the cast-in-place pile 1 is constructed by rotary excavation. (ii) a
And a second step: as shown in fig. 3, a transfer beam 2 is constructed above a cast-in-place pile 1, and a formwork is cast in situ. (ii) a
And a third step of: as shown in fig. 4, the rib columns 3 and the retaining plates 4 are constructed above the transfer beam, and a formwork is cast in situ. (ii) a
Step four, after the strength of the retaining structure formed by the conversion beam 2, the rib columns 3 and the retaining plates 4 reaches 80% of the design strength: as shown in fig. 5, the premixed gravity-flow cement soil 5 is filled into the wall layer by layer.
And a fifth step: as shown in fig. 6, the anchor cables 6 are constructed layer by layer while premixed with fluid cement soil 5 after backfilling the wall, backfilling is suspended when backfilling reaches a position 1m above each anchor cable 6, maintenance of the cement soil is carried out, the maintenance time is not less than 7 days, and the strength of the maintained cement soil is not less than 80% of the designed strength.
And constructing the anchor cable and maintaining the anchor body, and tensioning the anchor cable once after the anchor body reaches 80% of the designed strength, wherein the tensioning design is 50% of the prestress locking value.
A sixth procedure: and repeating the steps of 4-5 until the premixed fluid state cement soil is backfilled to the designed elevation and the anchor cable construction is completed, wherein the upper surface of the premixed fluid state cement soil after backfilling is flush with the top slope line.
A seventh step: and (4) stretching all the anchor cables for the second time, and designing a prestress locking value for the rest 50% of the stretched anchor cables.
The resulting timbering system is shown in figure 7,
example 2, see figure 7.
A supporting system for an existing high and steep slope in a narrow space is formed by the construction method of example 1, and the supporting system is shown in fig. 7.
The support system includes anchor-pull type pile plate retaining wall 500 arranged in the front of the existing high and steep side slope 100 far away, the anchor-pull type pile plate retaining wall 500 is arranged between the high and steep side slope 100 and the existing functional area 200 of the slope toe, and the horizontal distance between the anchor-pull type pile plate retaining wall 500 and the slope surface lines of the existing high and steep side slope 100 is 3-6 m. The anchor-pull type pile plate retaining wall 500 and the slope surface line of the existing high and steep slope 100 are backfilled with premixed fluid cement soil 5; the anchor draws formula pile slab barricade includes and keeps off native board 4, rib post 3, conversion roof beam 2, filling beam 1 and anchor rope 6, filling beam 1 sets up below slope toe ground 400, conversion roof beam 2 is connected rib post 3 and filling beam 1 set up on slope toe ground 400, it sets up between rib post 3 and premixed flow state soil cement 5 to keep off native board 4, anchor rope 6 slant runs through anchor draws formula pile slab barricade with backfill premixed flow state soil cement 5, and stretches into in the existing steep slope 100. The designed compressive strength of the premixed fluid state cement soil behind the formed supporting system is more than or equal to 1MPa.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
Claims (4)
1. A support system for an existing high and steep side slope in a narrow space is characterized by comprising an anchor-pull type pile plate retaining wall arranged in front of a far slope body, wherein the anchor-pull type pile plate retaining wall is arranged between the high and steep side slope and an existing functional area of a slope toe, and premixed fluid cement soil is backfilled between the anchor-pull type pile plate retaining wall and a slope surface line of the existing high and steep side slope;
the anchor draws formula pile slab barricade includes and keeps off native board, rib post, conversion roof beam, filling beam and anchor rope, the filling beam sets up below the toe ground, the conversion roof beam is connected rib post and filling beam set up at the toe subaerial, it sets up between rib post and premixed flow state soil cement to keep off native board, the anchor rope slant runs through the anchor draws formula pile slab barricade with backfill premixed flow state soil cement, and stretch into in the existing steep side slope.
2. The system according to claim 1, wherein the horizontal distance between the anchor-pull pile-plate retaining wall and the slope surface line of the existing high and steep slope is 3-6 m.
3. The supporting system for the existing high and steep slope in the narrow space as claimed in claim 1, wherein the designed compressive strength of the premixed fluid cement soil behind the supporting system is more than or equal to 1MPa.
4. A method for supporting an existing high and steep slope in a narrow space is characterized in that the method is supported by the system of any one of claims 1-3, and the construction method of the supporting system comprises the following steps:
(1) Constructing a cast-in-place pile between a toe of an existing high-steep slope and an existing functional area of the toe;
(2) Constructing a transfer beam, a rib column and a soil retaining plate above the cast-in-place pile;
(3) After the strength of a supporting and retaining structure consisting of the transfer beam, the rib columns and the soil retaining plates reaches 80% of the designed strength, backfilling the wall in layers and premixing the flowing cement soil;
(4) When backfilling is carried out to a position 1m above each anchor cable, backfilling is suspended, maintenance of cement soil is carried out, the maintenance time is not less than 7 days, the strength of the maintained cement soil is not less than 80% of the design strength, and the distance between the anchor cables is not less than 2m;
(5) Constructing the anchor cable and maintaining the anchor body, and tensioning the anchor cable once after the anchor body reaches 80% of the design strength, wherein the tensioning design prestress locking value is 50%;
(6) And (4) tensioning all the anchor cables for the second time, and designing a prestress locking value for the rest 50% of tensioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211430761.1A CN115821949A (en) | 2022-11-15 | 2022-11-15 | Support system and support method for existing high and steep slope in narrow space |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211430761.1A CN115821949A (en) | 2022-11-15 | 2022-11-15 | Support system and support method for existing high and steep slope in narrow space |
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| CN115821949A true CN115821949A (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211430761.1A Pending CN115821949A (en) | 2022-11-15 | 2022-11-15 | Support system and support method for existing high and steep slope in narrow space |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116623682A (en) * | 2023-05-11 | 2023-08-22 | 中冶武勘工程技术有限公司 | Continuous external corner self-locking support system for mountain building high-steep filling side slope and construction method thereof |
-
2022
- 2022-11-15 CN CN202211430761.1A patent/CN115821949A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116623682A (en) * | 2023-05-11 | 2023-08-22 | 中冶武勘工程技术有限公司 | Continuous external corner self-locking support system for mountain building high-steep filling side slope and construction method thereof |
| CN116623682B (en) * | 2023-05-11 | 2024-03-19 | 中冶武勘工程技术有限公司 | Continuous external corner self-locking support system for mountain building high-steep filling side slope and construction method thereof |
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