CN218437153U - Pre-reinforcing device for spray anchor steel arch frame foundation - Google Patents
Pre-reinforcing device for spray anchor steel arch frame foundation Download PDFInfo
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- CN218437153U CN218437153U CN202221871214.2U CN202221871214U CN218437153U CN 218437153 U CN218437153 U CN 218437153U CN 202221871214 U CN202221871214 U CN 202221871214U CN 218437153 U CN218437153 U CN 218437153U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model provides a spout anchor steel bow member basis pre-reinforcing apparatus, including the tunnel basal plane and the tunnel face that is located tunnel basal plane top, still including setting up the upper portion steel bow member that is used for promoting the holding power and prevents both sides infiltration on the tunnel basal plane and spout the concrete, upper portion steel bow member and spout the concrete and be arch hollow structure, the arch is inside to be tunnel face, upper portion steel bow member and spout concrete bottom welding basis pre-reinforcement material, in the basis pre-reinforcement material squeezes into the tunnel basal plane, the utility model discloses squeeze into upper portion steel bow member and spout the concrete in tunnel basal plane pipe canopy department, can consolidate the tunnel top surface effectively and prevent both sides infiltration, upper portion steel bow member and spout the concrete bottom surface and seal by the closed steel bow member in basis lower part, improved bearing capacity, can effectively prevent the infiltration of tunnel bottom simultaneously, upper portion steel bow member and spout concrete bottom welding basis pre-reinforcement material, promoted bearing capacity and reinforcing performance.
Description
Technical Field
The invention belongs to the field of underground building construction excavation, and particularly relates to a device for pre-reinforcing a spray anchor steel arch frame foundation.
Background
In the tunnel construction and excavation, the construction method of the shotcrete steel arch is commonly used, but if the upper structure is a broken rock stratum and the foundation is a sandy or other weak base layer and has high water content, such as an ancient river bed foundation; after the construction of the spray anchor steel arch frame is completed at the upper part, the excavation of the foundation construction of the lower steel arch frame cannot be safely carried out, and the steel arch frame cannot be closed. Therefore, it is necessary to design an efficient and safe excavation method for pre-reinforcing the shotcrete steel arch foundation in the excavation process of the tunnel.
SUMMERY OF THE UTILITY MODEL
For overcoming not enough among the background art, the utility model provides a shotcrete steel bow member basis pre-reinforcing apparatus, can be high-efficient, safe carry out type tunnel excavation.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a spout anchor steel bow member basis pre-reinforcing apparatus, includes the tunnel basal surface and is located the tunnel face of tunnel basal surface top, still including erectting the upper portion steel bow member that is used for promoting the holding power and prevents both sides infiltration on the tunnel basal surface and spout the concrete, upper portion steel bow member and spout the concrete and be arch hollow structure, the arch is inside to be tunnel face, upper portion steel bow member and spout the concrete bottom and welding the basis and in advance the reinforcement material, the basis is in advance the reinforcement material squeezes into in the tunnel basal surface.
Preferably, the upper steel arch and the bottom of the concrete spraying are welded with a foundation lower closed steel arch, the foundation lower closed steel arch closes the upper steel arch and the bottom of the concrete spraying, and the foundation lower closed steel arch is buried under the foundation surface of the tunnel.
Preferably, the upper steel arch frame and the outer surface of the concrete spraying are uniformly distributed with more than one group of pipe sheds, and the pipe sheds are tightly matched with the upper steel arch frame and the outer surface of the concrete spraying.
Preferably, the foundation pre-reinforcing materials are high-strength steel plate materials, the number of the foundation pre-reinforcing materials is two, the two groups of the foundation pre-reinforcing materials are respectively welded on the two sides of the upper steel arch frame and the two sides of the bottom of the sprayed concrete, and the two groups of the foundation pre-reinforcing materials are parallel to each other.
The invention has the beneficial effects that: the upper portion steel bow member is squeezed into and the concrete is spouted in tunnel base face pipe canopy department, can consolidate the tunnel top surface effectively and prevent both sides infiltration, upper portion steel bow member and spout the concrete bottom surface and seal by basic lower part closed steel bow member, bearing capacity is improved, can prevent effectively simultaneously that the tunnel bottom from seeping water, upper portion steel bow member and spout concrete bottom welding basic pre-reinforcement material, bearing capacity and reinforcement performance have been promoted, basic pre-reinforcement material and basic lower part closed steel bow member are buried underground under the tunnel basal plane, make this device itself more firm.
Drawings
FIG. 1 is a schematic cross-sectional view B-B of a pre-reinforced cross section of a shotcrete steel arch foundation excavated in a cavern;
FIG. 2 isbase:Sub>A schematic sectional view of the pre-reinforced longitudinal section A-A of the excavation spray anchor steel arch foundation of the cavity of the invention;
in the figure: 1. the upper steel arch frame and the concrete spraying 2, the pipe shed 3, the tunnel foundation surface 4, the foundation lower closed steel arch frame 5, the foundation pre-reinforcing material 6 and the tunnel face.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in figures 1 and 2, the pre-reinforcing device for the spray anchor steel arch foundation comprises an upper steel arch, spray concrete 1, a lower closed steel arch and a pre-reinforcing material, wherein the pre-reinforcing material is cast by high-strength steel. The utility model discloses a from up spiral lift excavation technology method down sets up central steel box culvert as swift current sediment passageway, adopts from last conventional excavation method to the excavation of accomplishing the vertical cavity in big tunnel footpath down to the cavity top after spiral excavation to the cavity top. The method comprises the following steps of (1) using a spray anchor steel arch frame for construction in soft geological cavern excavation, firstly designing the models and the densities of a pipe shed and the steel arch frame according to field geological conditions, namely after the construction of the pipe shed is completed, carrying out steel arch frame support, namely supporting one section, excavating one section, and carrying out lower part step; and gradually extending the steel arch frame to the foundation direction along with excavation of two sides. However, if the foundation is excavated downwards and the water content of the foundation is gradually increased when the foundation is in a weak layer, the simple excavation and supporting cannot be safely carried out, the extending engineering and the closing of the steel arch can not be completed, and the construction of the tunnel foundation engineering can not be completed. At the moment, steel sheet piles can be inserted into two sides of a foundation surface which cannot be safely constructed, namely the lower part of a steel arch frame in advance according to the field condition to pre-reinforce the two sides, and the insertion depth of the steel sheet piles exceeds the outer side line of the tunnel design excavation by more than 1 meter; so at first can provide the holding power through being connected of steel sheet pile and upper portion steel bow member, moreover can prevent both sides infiltration entering excavation basis, provide tunnel foundation excavation dry land construction environment.
As shown in fig. 1, the tunnel excavation is performed by firstly performing a first supporting project for a tunnel foundation surface 3 according to a conventional shotcrete steel arch method, then performing construction of a foundation and a reinforcing material 5, i.e., steel sheet piles, performing foundation excavation between the steel sheet piles after the construction of the steel sheet piles is completed, further completing (4) a foundation lower part closed steel arch project, and finally completing a supporting project for a tunnel upper part steel arch and shotcrete 1.
As shown in figure 2, the tunnel excavation is gradually completed with the upper anchor-spraying steel arch and the concrete-spraying 1 work according to a step method in stages, after the excavation surface reaches the foundation surface, the construction of steel sheet piles is carried out on the two sides of the foundation, the steel sheet pile project is divided into three sections in a circulating and reciprocating way, in order to ensure the safe construction, the three sections are in a state of 5-1 completion of foundation steel arch closing and permanent foundation supporting project, 5-2 completion of foundation excavation and foundation steel arch closing construction, and 5-3 completion of steel sheet pile construction. The core of the foundation circular excavation is the closing construction process of the 5-2 foundation steel arch, in order to ensure the safe construction of the 5-2 steel arch, the 5-1 steel arch needs to be finished to ensure the safety of the upper steel arch, and a foundation seepage path is increased to prevent seepage water from entering a foundation pit of the 5-2 steel arch; meanwhile, in order to ensure the safety of personnel and equipment of the 5-2 steel arch and a safe passage, namely, the permanent supporting construction of the 5-1 steel arch and the part of the 5-2 steel arch needs to be completed before the foundation of the 5-2 steel arch is closed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (4)
1. The utility model provides a shotcrete steel bow member basis pre-reinforcing apparatus, includes tunnel foundation face (3) and tunnel face (6) that are located tunnel foundation face (3) top, its characterized in that: still including erectting the upper portion steel bow member that is used for promoting the holding power and prevents both sides infiltration on tunnel foundation face (3) and spouting concrete (1), upper portion steel bow member and spout concrete (1) be arch hollow structure, the arch is inside to be tunnel face (6), upper portion steel bow member and spout concrete (1) bottom welding basis pre-reinforcement material (5), the basis is in the tunnel foundation face (3) of squeezing into in pre-reinforcement material (5).
2. The device for pre-reinforcing the foundation of the shotcrete steel arch frame according to claim 1, wherein: the bottom of the upper steel arch frame and the bottom of the concrete spraying frame (1) are welded with a foundation lower closed steel arch frame (4), the foundation lower closed steel arch frame (4) closes the bottom of the upper steel arch frame and the bottom of the concrete spraying frame (1), and the foundation lower closed steel arch frame (4) is buried under a tunnel foundation surface (3).
3. The device for pre-reinforcing the foundation of the shotcrete steel arch according to claim 1 or 2, wherein: the outer surfaces of the upper steel arch frame and the concrete spraying frame (1) are uniformly distributed with pipe sheds (2), the number of the pipe sheds (2) is more than one, and the pipe sheds (2) are tightly matched with the outer surfaces of the upper steel arch frame and the concrete spraying frame (1).
4. The device for pre-reinforcing the foundation of the shotcrete steel arch according to claim 1, wherein: the foundation pre-reinforcing materials (5) are made of high-strength steel plates, the two groups of foundation pre-reinforcing materials (5) are respectively welded on two sides of the bottom of the upper steel arch frame and the sprayed concrete (1), and the two groups of foundation pre-reinforcing materials (5) are parallel to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221871214.2U CN218437153U (en) | 2022-07-20 | 2022-07-20 | Pre-reinforcing device for spray anchor steel arch frame foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221871214.2U CN218437153U (en) | 2022-07-20 | 2022-07-20 | Pre-reinforcing device for spray anchor steel arch frame foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218437153U true CN218437153U (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221871214.2U Active CN218437153U (en) | 2022-07-20 | 2022-07-20 | Pre-reinforcing device for spray anchor steel arch frame foundation |
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| Country | Link |
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| CN (1) | CN218437153U (en) |
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2022
- 2022-07-20 CN CN202221871214.2U patent/CN218437153U/en active Active
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