CN217556961U - Expanding shell type prestressed anchor rod and spray anchor combined supporting structure for vertical shaft deep foundation pit - Google Patents
Expanding shell type prestressed anchor rod and spray anchor combined supporting structure for vertical shaft deep foundation pit Download PDFInfo
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- CN217556961U CN217556961U CN202221816701.9U CN202221816701U CN217556961U CN 217556961 U CN217556961 U CN 217556961U CN 202221816701 U CN202221816701 U CN 202221816701U CN 217556961 U CN217556961 U CN 217556961U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The combined supporting structure of the shell-expanding type prestressed anchor rod and the spray anchor of the deep foundation pit of the vertical shaft comprises a reinforced concrete crown beam, a self-advancing type hollow grouting anchor rod, a steel supporting frame, a shell-expanding type prestressed hollow grouting anchor rod and the like. Utilize the utility model discloses, can excavate the completion with the great high-lift deep basal pit of danger coefficient high efficiency in shorter time, for example big bias voltage, excavation shape are irregular, have the deep basal pit engineering such as water intaking shaft of atress deformation weak point, strut after accomplishing and can drop into and implement down one process, the construction is strutted to the deep basal pit excavation of complicated topography such as specially adapted bias voltage, broken rock stratum, near water.
Description
Technical Field
The utility model relates to a water intaking shaft hydraulic engineering field, concretely relates to is suitable for supporting construction of complicated topography deep basal pit excavation such as biasing, broken rock stratum, being close to water.
Background
Along with the rapid development of the water diversion type water conservancy and hydropower engineering, the method makes great contribution to the promotion of the development of the economic society and also has certain ecological benefit.
The traditional water taking project is used for selecting a reservoir in a remote mountain area, the geological environment around a water taking vertical shaft is complex, the broken zone has more faults, and the underground water condition is rich along with the bias effect of a high water head; in addition, the deep foundation pit engineering has small safety reserve and high risk. The traditional method of hanging the well wall upside down and the underground continuous wall, the large construction equipment needed by the traditional pile wall support, and the suitability under the narrow construction environment is not enough. A crown beam, a waist beam and an inner support system in the traditional foundation pit supporting construction have large occupied area and incomplete pertinence function, and are not suitable for water taking head shaft engineering in a complex environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, solve current high water head bias voltage, the excavation technique of water intaking shaft under the complicated geological environment, construction speed is slow, the safety risk is higher, place suitability is low grade not enough, a shell-expanding prestressed anchorage pole that can assemble fast, high efficiency and form and spout anchor combination supporting construction is provided, the pin excavation is pursued, the pin is strutted one by one, it consolidates to give full play to every circulation, the stagnant water, strut characteristics, can not only satisfy the demand of construction under the complicated place, reduce the safety risk of water side bias voltage, still can be used to build the permanent structure of water intaking shaft.
The utility model provides a technical scheme that its technical problem adopted is:
the expanding-shell type prestressed anchor rod and spray anchor combined supporting structure for the deep foundation pit of the vertical shaft comprises a reinforced concrete crown beam, a first self-propelled hollow grouting anchor rod, a steel supporting frame, an expanding-shell type prestressed hollow grouting anchor rod and a second self-propelled hollow grouting anchor rod;
the reinforced concrete crown beam is arranged at a shaft sealing position, a series of first self-advancing hollow grouting anchor rods are arranged at the corners of the reinforced concrete crown beam at equal intervals, and the first self-advancing hollow grouting anchor rods are used for grouting and consolidating rock strata;
the steel supporting frame comprises two I-shaped steels, two sides of the two I-shaped steels are welded and connected through a first steel backing plate, the steel supporting frame is transversely installed to the side wall of the bedrock for one circle in a combined mode and called as one truss, a reinforcing mesh is installed between the steel supporting frame and the side wall of the bedrock, the shell-expanding type prestressed hollow grouting anchor rods and the second self-advancing type hollow grouting anchor rods are arranged at equal intervals and penetrate through the steel supporting frame to extend into the soil body of the side wall of the bedrock, the shell-expanding type prestressed hollow grouting anchor rods and the second self-advancing type hollow grouting anchor rods are fastened through a second steel backing plate and nuts, concrete is sprayed on the steel supporting frame and the reinforcing mesh, and the shell-expanding type prestressed hollow grouting anchor rods and the second self-advancing type hollow grouting anchor rods are used for grouting and consolidating the rock stratum;
and the steel supporting frames are excavated and supported one by one from top to bottom at the side of the vertical shaft to form a supporting structure with complete functions.
Furthermore, the prestressed anchoring head of the expanding-shell type prestressed hollow grouting anchor rod penetrates into the rock-soil layer, a jack is used for stretching the expanding-shell type prestressed hollow grouting anchor rod to apply prestress according to the initial prestress value required by the design, the rock-soil layer and the anchor rod are integrated, and the rock-soil layer is grouted and consolidated.
Furthermore, I-shaped steel is welded at the corner of each steel supporting frame.
And furthermore, two adjacent I-shaped steels are welded and connected through connecting ribs.
And further, a PVC drain pipe is installed on the side wall of the bedrock through drilling, the PVC drain pipe is tilted up by 10 degrees, and fracture water in the rock body is drained.
And further, bottom-sealing I-beams are arranged at the bottom of the vertical shaft, and are firmly welded with the transverse I-beams on the two side walls, and concrete is sprayed.
Furthermore, effective water stopping measures such as curtain grouting and the like are arranged before the shaft side is excavated.
Furthermore, a water retaining wall is built on the reinforced concrete crown beam and a protective railing is arranged on the reinforced concrete crown beam.
The utility model provides a shell type prestressed anchorage pole and shotcrete combination supporting construction rises, this structure is not weakened than traditional structure in the aspect of the atress, but its simple structure, the atress is clear and definite, the construction is swift, the quality is reliable, green, the cycle construction, can effectively adapt to complicated geological environment condition, be favorable to the stability on soil layer, prevent the infiltration of big bias voltage lateral wall, and reduce and occupy the operation face space, and simultaneously, to the engineering progress, the project cost, all there is apparent change, it has higher meaning to accomplish construction task in scheduled time to the project, social each side evaluation is better.
Utilize the utility model discloses, can excavate the completion with the great high-lift deep basal pit of danger coefficient high efficiency in shorter time, for example big bias voltage, excavation shape are irregular, have the deep basal pit engineering such as water intaking shaft of atress deformation weak point, strut after accomplishing and can drop into and implement down one process, specially adapted bias voltage, broken rock stratum, complicated topography deep basal pit excavation such as being close to water struts the construction.
Drawings
Fig. 1 is a schematic plan view of an embodiment of the present invention;
fig. 2 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 3 is a schematic side elevational view of the embodiment shown in FIG. 2;
FIG. 4 is a detail view of the part A structure of the embodiment shown in FIG. 3;
FIG. 5 is a detail view of the structure of the expanding-shell type prestressed hollow grouting anchor rod in the embodiment shown in FIG. 3;
in the figure: 1. the concrete wall comprises a sprayed concrete wall, 2. A foundation, 3. I-steel, 4. A first self-advancing hollow grouting anchor rod, 5. An expanding shell type prestressed hollow grouting anchor rod, 6. A second self-advancing hollow grouting anchor rod, 7. A reinforced concrete crown beam, 8. A water retaining wall, 9. A protective railing, 10. A steel support frame, 11. A back cover I-steel, 12. A diversion tunnel, 13. A broken geological slope, 14. A reservoir, 15. An anchor rod hole, 16. An exhaust pipe, 17. A first steel liner plate, 18. A second steel liner plate, 19. A nut, 20. A welding foot, 21. A bedrock side, 22. A vertical shaft side, 23. A PVC drain pipe, 24. A prestressed anchoring head and 25. An exhaust hole.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1-5, the expanding-shell type prestressed anchor rod and spray anchor combined supporting structure for the vertical shaft deep foundation pit comprises a reinforced concrete crown beam 7, a first self-propelled hollow grouting anchor rod 4, a steel support frame 10, an expanding-shell type prestressed hollow grouting anchor rod 5 and a second self-propelled hollow grouting anchor rod 6;
the reinforced concrete crown beam 7 is arranged at a shaft sealing position, a series of first self-propelled hollow grouting anchor rods 4 are equidistantly arranged at the corner of the reinforced concrete crown beam 7 at intervals, and the first self-propelled hollow grouting anchor rods 4 are used for grouting and consolidating a rock stratum;
the steel support frame 10 comprises two I-shaped steels 3, two sides of the two I-shaped steels 3 are welded and connected through a first steel backing plate 17, the steel support frame 10 is transversely installed to the side wall of the bedrock side 21 in a combined mode for a circle, namely a single frame, a steel mesh is installed between the steel support frame 10 and the side wall of the bedrock side 21, the shell-expanding type prestressed hollow grouting anchor rods 5 and the second self-advancing hollow grouting anchor rods 6 are arranged at equal intervals and penetrate through the steel support frame 10 to extend into the soil body on the side wall of the bedrock side 21, the shell-expanding type prestressed hollow grouting anchor rods 5 and the second self-advancing hollow grouting anchor rods 6 are fastened through a second steel backing plate 18 and nuts 19, concrete is sprayed on the steel support frame 10 and the steel mesh, and the shell-expanding type prestressed hollow grouting anchor rods 5 and the second self-advancing hollow grouting anchor rods 6 are used for grouting and consolidating rock strata;
the steel support frames 10 are excavated from top to bottom at the side of the vertical shaft and supported one by one to form a supporting structure with complete functions.
In this embodiment, the prestressed anchoring head 24 of the expanding-shell type prestressed hollow grouting anchor rod 5 is inserted into the rock-soil layer, and the expanding-shell type prestressed hollow grouting anchor rod 5 is tensioned by a jack to apply prestress according to the initial prestress value required by the design, so that the rock-soil layer and the anchor rod are integrated into a whole, and the rock-soil layer is consolidated by grouting.
In this embodiment, i-shaped steel is welded to the corner of each steel support frame 10.
In this embodiment, two adjacent h-shaped steels are welded and connected through a connecting rib.
In the embodiment, a PVC drain pipe 23 is drilled and installed on the side wall of the bedrock side 21, and is tilted upwards by 10 degrees to drain fracture water in a rock body.
In the embodiment, the bottom of the shaft is provided with a back cover I-shaped steel 11, the back cover I-shaped steel 11 is firmly welded with the transverse I-shaped steel 3 on the two side walls, and concrete is sprayed, wherein the grade of the concrete is at least more than C20.
In this embodiment, effective water stopping measures such as curtain grouting are provided before the shaft side 22 is excavated.
In the embodiment, the vertical shaft reinforced concrete crown beam 7 is provided with the water retaining wall 8 by masonry, and cement mortar is adopted for plastering. And a 1.2m high protective railing 9 is arranged on the vertical shaft reinforced concrete crown beam 7.
The engineering example generally adopts the steps of stopping water and then excavating, forming a waterproof curtain on the periphery by utilizing curtain grouting on the periphery to prevent the occurrence of water permeation accidents, excavating a layer of support, wherein the height of the support is 1.0-2.0m each time, and the middle of a vertical shaft is lower than the periphery by 1.5m during excavating, so that the stone excavation of an excavator and the installation of a beam of I-steel for trimming and excavating side walls are facilitated. After excavation is finished, concrete is sprayed for primary spraying and surface protection, then a reinforcing mesh and a steel support frame 10 are installed, then a shell-expanding type prestressed hollow grouting anchor rod 5 is constructed, tensioning, locking, grouting and net hanging and spraying are carried out firstly, and a circle of supporting system which is integrally stressed, firm and safe is formed. The whole construction process is simple, safe and efficient.
When the vertical shaft is excavated layer by layer, because the rock mass of the well body of the water-taking vertical shaft is broken, the rock mass around the well body can be effectively consolidated through grouting before spray anchor supporting, and slurry is diffused to fill the cracks to have the functions of consolidation and water resistance. And (3) adopting a pressure grouting method, sealing holes by adopting mortar, stopping grouting after the grouting pressure is continuously stabilized for 20 minutes, and observing the change of the cover weight at any time in the grouting process.
The construction is flexible, and the geological condition suitability is good. The foundation pit is supported by combining geological conditions and adopting a spray anchor combination mode, and the advantages of the expansion shell type prestressed hollow grouting anchor rod and the self-propelled hollow grouting anchor rod in the targeted reinforcement are explained; the method avoids large construction equipment and horizontal transverse support required by traditional pile wall support, and has suitability in narrow construction environment.
The foundation pit rock stratum reinforcing, water stopping and supporting effects are good, and the construction safety and reliability are high. The field geology mainly takes sandstone and argillaceous sandstone as main materials, rock strata are broken, the curtain grouting around the vertical shaft is subjected to the sequential encryption principle, the final pressure of the segmented circulating grouting from top to bottom reaches 2.0MPa, and a water-stop curtain is formed to solve the water seepage of the vertical shaft. In the shaft excavation process, the consolidation grouting technology is adopted to solve the problem of rock stratum breakage under the grouting pressure of 0.3-0.5MPa, so that the integral deformation resistance of the rock stratum is improved, and the collapse phenomenon in the shaft excavation process is effectively prevented.
The mechanical construction condition is good, and the construction efficiency is high. The construction progress is fast, the excavation of the foundation pit and the shotcrete support are carried out simultaneously, and the foundation pit forming and bottom sealing period is short; the top beam, the waist beam and the horizontal inner support system in the traditional foundation pit supporting construction are eliminated, the foundation pit operation surface is large, the machine is more suitable for mechanical excavation and slag discharge, and the construction progress is greatly accelerated.
The civilized construction condition is good, and the natural resource environmental protection effect is high. Waste slurry is not generated in the construction process, and the waste slurry in grouting construction can be collected and treated in a centralized manner, so that water source pollution is avoided, and the ecological environment of a natural protection area is effectively guaranteed.
Low construction cost and good economic benefit. Compared with the traditional method which adopts a spray-anchor combined supporting system, the method does not need large equipment investment (entering and exiting and installation), does not need a large power supply, is not influenced by a construction site, is simple and quick to construct, shortens the construction period, reduces the mechanical equipment, material cost and labor cost, and greatly improves the economic benefit.
Claims (8)
1. Shaft deep basal pit shell-expanding prestressed anchorage pole and spray anchor combined supporting structure, its characterized in that: the self-advancing type hollow grouting anchor rod comprises a reinforced concrete crown beam, a first self-advancing type hollow grouting anchor rod, a steel support frame, an expanding shell type prestressed hollow grouting anchor rod and a second self-advancing type hollow grouting anchor rod;
the reinforced concrete crown beam is arranged at a shaft sealing position, a series of first self-advancing hollow grouting anchor rods are arranged at the corners of the reinforced concrete crown beam at equal intervals, and the first self-advancing hollow grouting anchor rods are used for grouting and consolidating rock strata;
the steel supporting frame comprises two I-shaped steels, two sides of the two I-shaped steels are welded and connected through a first steel backing plate, the steel supporting frame is transversely installed to the side wall of the bedrock for one circle in a combined mode and called as one truss, a reinforcing mesh is installed between the steel supporting frame and the side wall of the bedrock, the shell-expanding type prestressed hollow grouting anchor rods and the second self-advancing type hollow grouting anchor rods are arranged at equal intervals and penetrate through the steel supporting frame to extend into the soil body of the side wall of the bedrock, the shell-expanding type prestressed hollow grouting anchor rods and the second self-advancing type hollow grouting anchor rods are fastened through a second steel backing plate and nuts, concrete is sprayed on the steel supporting frame and the reinforcing mesh, and the shell-expanding type prestressed hollow grouting anchor rods and the second self-advancing type hollow grouting anchor rods are used for grouting and consolidating the rock stratum;
and the steel supporting frames are excavated and supported one by one from top to bottom at the side of the vertical shaft to form a supporting structure with complete functions.
2. The expanding shell type prestressed anchor rod and spray anchor combined supporting structure of a vertical shaft deep foundation pit as claimed in claim 1, wherein: the prestressed anchoring head of the expanding-shell type prestressed hollow grouting anchor rod extends deep into a rock-soil layer, a jack is used for tensioning the expanding-shell type prestressed hollow grouting anchor rod to apply prestress according to the initial prestress value of the design requirement, the rock-soil layer and the anchor rod are integrated, and the rock-soil layer is grouted and consolidated.
3. The expanding shell type prestressed anchor rod and spray anchor combined supporting structure for the vertical shaft deep foundation pit as claimed in claim 1 or 2, wherein: i-shaped steel is welded at the corner of each steel supporting frame.
4. The combined supporting structure of the expanding shell type prestressed anchor rod and the spray anchor of the vertical shaft deep foundation pit according to claim 1 or 2, characterized in that: two adjacent H-shaped steels are welded and connected through connecting ribs.
5. The combined supporting structure of the expanding shell type prestressed anchor rod and the spray anchor of the vertical shaft deep foundation pit according to claim 1 or 2, characterized in that: and (3) drilling holes on the lateral side wall of the bedrock to install PVC drain pipes, and inclining upwards by 10 degrees.
6. The combined supporting structure of the expanding shell type prestressed anchor rod and the spray anchor of the vertical shaft deep foundation pit according to claim 1 or 2, characterized in that: and bottom-sealing I-beams are arranged at the bottom of the vertical shaft, are firmly welded with the transverse I-beams on the two side walls, and are sprayed with concrete.
7. The combined supporting structure of the expanding shell type prestressed anchor rod and the spray anchor of the vertical shaft deep foundation pit according to claim 1 or 2, characterized in that: and (4) arranging curtain grouting before opening the side of the vertical shaft.
8. The combined supporting structure of the expanding shell type prestressed anchor rod and the spray anchor of the vertical shaft deep foundation pit according to claim 1 or 2, characterized in that: and the reinforced concrete crown beam is provided with a masonry retaining wall and a protective railing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221816701.9U CN217556961U (en) | 2022-07-15 | 2022-07-15 | Expanding shell type prestressed anchor rod and spray anchor combined supporting structure for vertical shaft deep foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221816701.9U CN217556961U (en) | 2022-07-15 | 2022-07-15 | Expanding shell type prestressed anchor rod and spray anchor combined supporting structure for vertical shaft deep foundation pit |
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| CN217556961U true CN217556961U (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221816701.9U Active CN217556961U (en) | 2022-07-15 | 2022-07-15 | Expanding shell type prestressed anchor rod and spray anchor combined supporting structure for vertical shaft deep foundation pit |
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| CN (1) | CN217556961U (en) |
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2022
- 2022-07-15 CN CN202221816701.9U patent/CN217556961U/en active Active
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