CN110131479B - Reaction structure for jacking operation of soft soil foundation super-large section jacking pipe - Google Patents
Reaction structure for jacking operation of soft soil foundation super-large section jacking pipe Download PDFInfo
- Publication number
- CN110131479B CN110131479B CN201910510655.6A CN201910510655A CN110131479B CN 110131479 B CN110131479 B CN 110131479B CN 201910510655 A CN201910510655 A CN 201910510655A CN 110131479 B CN110131479 B CN 110131479B
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- China
- Prior art keywords
- bottom plate
- steel
- jacks
- jacking
- rectangular steel
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- 239000002689 soil Substances 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 10
- 239000004567 concrete Substances 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 10
- 238000004873 anchoring Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a reaction structure for jacking operation of a top pipe with an oversized section of a soft soil foundation, which comprises a bottom plate and a substrate for reinforcing the bottom plate, wherein the substrate is a stirring pile or a jet grouting pile arranged below the bottom plate, a base for installing jacks is arranged on the bottom plate, rectangular steel members are further arranged on the bottom plate, reaction ends of the jacks are in equidistant abutting connection with the front end face of the rectangular steel members, reaction force is applied to the rectangular steel members, steel corbels corresponding to the jacks are arranged on the rear end face of the rectangular steel members, and the steel corbels are fixedly connected with steel bars pre-buried in the substrate to provide reaction force support for the rectangular steel members. According to the invention, the foundation anchoring structure combined by the stirring piles or the jet grouting piles and the prestressed anchor rods is used for replacing the conventional back wall method, on one hand, the foundation is reinforced by the stirring piles or the jet grouting piles, and on the other hand, acting force is transmitted into the soil layer by the embedded bars, so that the anchoring structure is kept stable, and the jacking force generated by jacking equipment in the construction process of the large-section jacking pipe of the soft soil foundation can be borne.
Description
Technical Field
The invention relates to the field of reaction structures for jacking operation of a top pipe with an oversized section of a soft soil foundation.
Background
The pipe jacking construction is to adopt pushing equipment such as a hydraulic jack and the like, to lower a tool pipe or a heading machine from an originating well according to a designed gradient, excavate and penetrate a soil layer until the tool pipe or the heading machine is lifted up in a receiving well, and the prefabricated pipe joint is continuously prolonged and buried between two working wells after the tool pipe or the heading machine is tightly driven by the jack to push, so that the non-excavation laying of an underground pipeline is realized.
In the construction of underground pipe jacking, the back wall is a wall body used for resisting jacking counter force in a working well and mainly provides enough supporting force for jacking equipment. In the whole construction process, the pressure generated by the jacking pipe is concentrated on the back wall, so that the stability and the bearing capacity of the back rest have very important effects on the construction of the whole underground jacking pipe.
At present, the common practice of the back wall is to form a thicker reinforced concrete wall, bind reinforcing steel bars together with the lining wall in construction and cast concrete integrally together. However, under the condition of crossing a shallow soil-covered soft soil stratum, the top force of the super-large section top pipe is far higher than the allowable top force of a rear back wall structure and a soil body of a conventional working well, and the former working well and the rear back wall form are extremely easy to generate instability and damage during construction.
Disclosure of Invention
The invention aims to provide a counterforce structure for jacking operation of a top pipe with an oversized section of a soft soil foundation, which solves the problem that the conventional back wall method cannot meet the jacking counterforce in the current construction of a rectangular top pipe with a large section in a soft soil area, and provides guarantee for safe construction.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the counter-force structure comprises a bottom plate and a substrate for reinforcing the bottom plate, wherein a plurality of jacks are arranged on the bottom plate in a transverse parallel mode, a base for installing the jacks is arranged on the base, at least one hoop for fixing the jacks is arranged on the base, rectangular steel members are further arranged on the bottom plate, counter-force ends of the jacks are in equidistant contact with the front end face of the rectangular steel members, counter-force is applied to the rectangular steel members, steel corbels corresponding to the jacks are arranged on the rear end face of the rectangular steel members, and the steel corbels are fixedly connected with pre-buried steel bars in the substrate to provide counter-force support for the rectangular steel members;
the substrate is a stirring pile or a jet grouting pile which is arranged below the bottom plate, the height of the stirring pile or the jet grouting pile is six meters, a vertical pre-stressing anchor rod is pre-buried in the stirring pile or the jet grouting pile, and the upper end of the pre-stressing anchor rod is buried in the bottom plate to strengthen the bottom plate;
the steel corbel is right trapezoid steel member, right angle waist butt of steel corbel is on the rear end face of rectangle steel member, and the terminal surface is equipped with a plurality of bolt holes under the steel corbel, is equipped with high strength bolt in the bolt hole, pre-buried reinforcing bar in the basement is the HRB400 reinforcing bar of vertical setting, and the bottom plate is buried in HRB400 reinforcing bar upper end and is connected with high strength bolt sleeve, fixes the steel corbel.
Furthermore, the bottom plate is formed by casting C40 concrete.
Further, a plain concrete cushion layer is arranged between the bottom plate and the substrate, and the plain concrete cushion layer is 200mm thick C20 concrete.
Further, a steel box is embedded in the bottom plate, and the steel box is sleeved outside the HRB400 steel bars.
The beneficial effects of the invention are as follows: the foundation anchoring structure combined by the stirring piles or the jet grouting piles and the prestressed anchor rods replaces the conventional back wall method, on one hand, the foundation is reinforced by the stirring piles or the jet grouting piles, on the other hand, acting force is transmitted into a soil layer by the embedded steel bars, so that the anchoring structure is kept stable, the jacking force generated by jacking equipment in the construction process of the large-section jacking pipe of the soft soil foundation can be borne, the steel corbel is firmly supported in terms of rigidity, strength and the like, the force transmission and the whole stress are ensured, the problems that the traditional back wall method cannot provide effective support for jacking the large-section jacking pipe or cannot control deformation and the like are solved, and the safety and the smooth performance of the jacking pipe engineering are ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view of a base plate and a substrate of the present invention;
FIG. 3 is a bottom view of the steel corbel of the present invention;
fig. 4 is a schematic view of the installation of the steel corbel of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1-4, a reaction structure for jacking a top pipe with an oversized section of a soft soil foundation comprises a bottom plate 1 and a substrate 2 for reinforcing the bottom plate 1, wherein a plurality of jacks 3 (not shown in the drawing) which are transversely arranged in parallel are arranged on the bottom plate 1, a base 4 for installing the jacks 3 is arranged on the base 4, at least one hoop 5 for fixing the jacks 3 is arranged on the base 4, rectangular steel members 6 are also arranged on the bottom plate 4, reaction ends of the jacks 3 are in equidistant contact with the front end surface of the rectangular steel members 6, reaction force is applied to the rectangular steel members 6, steel corbels 7 corresponding to the jacks 3 are arranged on the rear end surface of the rectangular steel members 6, and the steel corbels 7 are fixedly connected with steel bars 11 pre-buried in the substrate 2 to provide reaction force support for the rectangular steel members 6;
as shown in fig. 2, the substrate 2 is a stirring pile or a jet grouting pile arranged below the bottom plate 1, the height of the stirring pile or the jet grouting pile is six meters, a vertical pre-stressing anchor rod 8 is pre-buried in the stirring pile or the jet grouting pile, and the upper end of the pre-stressing anchor rod 8 is buried in the bottom plate to strengthen the bottom plate;
the steel corbel 7 is right trapezoid steel member, right angle waist butt of steel corbel 7 is on the rear end face of rectangle steel member 6, and the terminal surface is equipped with a plurality of bolt holes 9 under the steel corbel 7, is equipped with high strength bolt 10 in the bolt hole 9, as shown in fig. 3, pre-buried reinforcing bar 11 in the basement 2 is the HRB400 reinforcing bar of vertical setting, and HRB400 reinforcing bar upper end buries bottom plate 1 and with high strength bolt 10 telescopic joint, as shown in fig. 4, fixes steel corbel 7, transmits the reaction force of steel corbel 7 transmission in the soil layer simultaneously.
The bottom plate 1 is formed by casting C40 concrete.
A plain concrete cushion layer 12 is arranged between the bottom plate 1 and the substrate 2, and the plain concrete cushion layer is 200mm thick C20 concrete.
The steel box 13 is embedded in the bottom plate 1, and the steel box 13 is sleeved outside the HRB400 steel bars.
The foundation anchoring structure combined by the stirring piles or the jet grouting piles and the prestressed anchor rods replaces the conventional back wall method, on one hand, the foundation is reinforced by the stirring piles or the jet grouting piles, on the other hand, acting force is transmitted into a soil layer by the embedded steel bars, so that the anchoring structure is kept stable, the jacking force generated by jacking equipment in the construction process of the large-section jacking pipe of the soft soil foundation can be borne, the steel corbel is firmly supported in terms of rigidity, strength and the like, the force transmission and the whole stress are ensured, the problems that the traditional back wall method cannot provide effective support for jacking the large-section jacking pipe or cannot control deformation and the like are solved, and the safety and the smooth performance of the jacking pipe engineering are ensured.
The described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Claims (1)
1. The counter-force structure for jacking operation of the top pipe with the super large section of the soft soil foundation is characterized by comprising a bottom plate and a substrate for reinforcing the bottom plate, wherein a plurality of jacks which are transversely arranged in parallel are arranged on the bottom plate, a base for installing the jacks is arranged on the base, at least one hoop for fixing the jacks is arranged on the base, rectangular steel members are further arranged on the bottom plate, counter-force ends of the jacks are in equidistant contact with the front end face of the rectangular steel members, counter-force is applied to the rectangular steel members, steel corbels corresponding to the jacks are arranged on the rear end face of the rectangular steel members, and the steel corbels are fixedly connected with pre-buried steel bars in the substrate to provide counter-force support for the rectangular steel members;
the foundation is a stirring pile or a jet grouting pile arranged below the bottom plate, the height of the stirring pile or the jet grouting pile is determined according to the soil layer of the field, a vertical pre-stressing anchor rod is pre-buried in the stirring pile or the jet grouting pile, and the upper end of the pre-stressing anchor rod is buried and fixed in the bottom plate to strengthen the bottom plate;
the steel corbel is a right trapezoid steel member, a right-angle waist of the steel corbel is abutted to the rear end face of the rectangular steel member, a plurality of bolt holes are formed in the lower end face of the steel corbel, high-strength bolts are arranged in the bolt holes, pre-buried steel bars in the substrate are vertically arranged HRB400 steel bars, and the upper ends of the HRB400 steel bars are embedded into the bottom plate and are connected with the high-strength bolt sleeves to fix the steel corbel;
the bottom plate is formed by casting C40 concrete;
a plain concrete cushion layer is arranged between the bottom plate and the substrate, and the plain concrete cushion layer is 200mm thick C20 concrete;
and a steel box is embedded in the bottom plate and sleeved outside the HRB400 steel bars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910510655.6A CN110131479B (en) | 2019-06-13 | 2019-06-13 | Reaction structure for jacking operation of soft soil foundation super-large section jacking pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910510655.6A CN110131479B (en) | 2019-06-13 | 2019-06-13 | Reaction structure for jacking operation of soft soil foundation super-large section jacking pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110131479A CN110131479A (en) | 2019-08-16 |
| CN110131479B true CN110131479B (en) | 2024-04-16 |
Family
ID=67581524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910510655.6A Active CN110131479B (en) | 2019-06-13 | 2019-06-13 | Reaction structure for jacking operation of soft soil foundation super-large section jacking pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110131479B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455726A (en) * | 2014-11-20 | 2015-03-25 | 广州市市政集团有限公司 | Pipe-jacking construction method for pipeline bottom grouting reinforcement |
| JP2015143454A (en) * | 2013-12-25 | 2015-08-06 | 日本ヒューム株式会社 | Concrete jacked pipe for pipe jacking method |
| CN210106749U (en) * | 2019-06-13 | 2020-02-21 | 福建工程学院 | Counter-force structure of soft soil foundation super large section push pipe jacking operation |
-
2019
- 2019-06-13 CN CN201910510655.6A patent/CN110131479B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015143454A (en) * | 2013-12-25 | 2015-08-06 | 日本ヒューム株式会社 | Concrete jacked pipe for pipe jacking method |
| CN104455726A (en) * | 2014-11-20 | 2015-03-25 | 广州市市政集团有限公司 | Pipe-jacking construction method for pipeline bottom grouting reinforcement |
| CN210106749U (en) * | 2019-06-13 | 2020-02-21 | 福建工程学院 | Counter-force structure of soft soil foundation super large section push pipe jacking operation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110131479A (en) | 2019-08-16 |
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