CN114893222A - Auxiliary reinforcing device for expanding arch springing and construction method thereof - Google Patents
Auxiliary reinforcing device for expanding arch springing and construction method thereof Download PDFInfo
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- CN114893222A CN114893222A CN202210550895.0A CN202210550895A CN114893222A CN 114893222 A CN114893222 A CN 114893222A CN 202210550895 A CN202210550895 A CN 202210550895A CN 114893222 A CN114893222 A CN 114893222A
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- Prior art keywords
- arch springing
- arch
- reinforcing device
- steel
- springing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/30—Bases for lower arch members
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/183—Supporting means for arch members, not provided for in E21D11/22
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses an expansion arch springing auxiliary reinforcing device, which comprises a steel arch frame, a base plate, a bolt and an arch springing reinforcing device, wherein the steel arch frame is connected with the base plate; the invention also discloses a construction method of the expansion arch springing auxiliary reinforcing device, which can effectively reinforce the soil layer at the arch springing part of the soil tunnel, improve the overall stability of the arch springing, avoid the condition of primary support overall settlement caused by insufficient stability of the arch springing, and has the characteristics of simple construction process, flexible installation, strong overall stability of the arch springing, good effect of reinforcing the soil layer at the lower part of the arch springing, low construction cost and the like.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering support, and relates to an auxiliary reinforcing device for an enlarged arch springing.
The invention also relates to a construction method of the auxiliary reinforcing device for the enlarged arch springing.
Background
China is vast in breadth, geological conditions are very complex, various soft strata are inevitably met in the construction of tunnels, particularly in the construction process of soil tunnels, according to the prior experience, in the construction of the soil tunnels, the tunnel is influenced by tunnel excavation and sometimes has large deformation and sudden change instability under the rainfall action in rainy seasons, the stability of soil layers influences the excavation safety and construction quality of the tunnels to a certain extent, and great challenges are brought to engineering design and construction.
For the construction condition of the soil tunnel, a mode of subsection excavation is generally adopted, such as: a two-step method, a three-step method, an annular excavation reserved core soil method, a middle partition wall method (CD method), a cross middle partition wall method (CRD method), a double-side-wall pit guiding method and the like. In the step method construction process, when the next circulating procedure is excavated after the upper step arch centering is installed, the upper primary support is easy to incline or sink on one side due to the fact that the soil layer is weak and poor in stability and the bearing capacity of the soil layer at the arch foot position is insufficient, so that the tunnel is likely to be further aggravated to generate disastrous conditions such as large deformation or sudden instability, and the like, and the hazards are caused to the life and property safety of constructors. Therefore, in the process of constructing the soil tunnel by adopting the step method, the stability of the arch springing of the primary support of the upper step needs to be ensured, the primary support is prevented from generating excessive settlement, and the engineering safety is ensured.
Disclosure of Invention
The invention aims to provide an expansion arch springing auxiliary reinforcing device, which can effectively reinforce the soil layer at the arch springing part of a soil tunnel, improve the overall stability of the arch springing and avoid the condition of overall settlement of primary support caused by insufficient stability of the arch springing.
Another object of the present invention is to provide a construction method of the auxiliary reinforcing device for the enlarged arch springing.
The first technical scheme adopted by the invention is that the auxiliary reinforcing device for the enlarged arch springing comprises a steel arch center, wherein a base plate is welded at the bottom of the steel arch center, and the bottom of the base plate is connected with an arch springing reinforcing device.
The first technical solution of the present invention is also characterized in that:
wherein the steel arch frame is I-shaped steel;
the base plate is a square steel plate, the thickness of the base plate is 15-20 mm, the side length of the base plate is not less than 1.5 times of the height of the steel arch frame, four corners of the base plate are provided with fillets, and the radius of each fillet is 25 mm;
the base plate is provided with a plurality of bolt holes, the bolt holes are uniformly distributed on the surface of the base plate, and the bolt holes are used for connecting the arch springing reinforcing device;
the arch springing reinforcing device is a cuboid box welded by steel plates, the length and the width of the arch springing reinforcing device are 10cm larger than the side length of the base plate, and the height of the arch springing reinforcing device is 20 cm;
the grouting holes are formed in one side face of the arch foot reinforcing device, the U-shaped notches are formed in the remaining three side faces of the arch foot reinforcing device respectively, a plurality of grout scattering holes are formed in the bottom of the arch foot reinforcing device, the aperture of each grout scattering hole is 10-20 mm, and the grout scattering holes are arranged in a quincunx shape.
The second technical scheme adopted by the invention is that the construction method of the expansion arch springing auxiliary reinforcing device adopts the expansion arch springing auxiliary reinforcing device, and is implemented according to the following steps:
step 5, drilling a foot locking anchor rod, and spraying concrete again to the designed thickness;
and 6, performing the next circulating tunnel excavation process.
The invention has the beneficial effects that:
the reinforcing device and the construction method for improving the stability of the arch springing of the soil tunnel have the characteristics of simple construction process, flexible installation, strong integral stability of the arch springing, good effect of reinforcing the soil layer at the lower part of the arch springing, low construction cost and the like, and have remarkable economic, environmental protection and social benefits and wide application prospect;
the arch foot reinforcing device adopted by the invention can be manufactured by using field materials, has lower production cost, high bonding strength with the steel arch frame and obvious effect on reinforcing a soil layer;
according to the arch springing reinforcing device, micro-expansion cement slurry is injected through the arranged grouting holes, the whole device is filled with the slurry in an expansion mode, the surrounding soil layer is reinforced, and the overall stability of the contact between the arch springing part and the soil layer is improved;
the arch foot reinforcing device and the corresponding construction method adopted by the invention can improve the overall rigidity of the steel arch frame, reinforce the surrounding soil layer, improve the overall stability of the arch foot part, effectively avoid the condition that the primary support is wholly sunk due to insufficient bearing capacity of the arch foot soil layer, further cause tunnel collapse, greatly reduce the potential safety hazard of soil tunnel construction and ensure the life and property safety of constructors.
Drawings
FIG. 1 is a perspective view of an enlarged arch foot auxiliary reinforcement of the present invention;
FIG. 2 is a side view of the enlarged arch foot auxiliary reinforcement of the present invention;
FIG. 3 is a top view of the backing plate of the present invention for an enlarged arch foot auxiliary reinforcement;
fig. 4 is a bottom view of the auxiliary reinforcing apparatus for an enlarged arch foot of the present invention.
In the figure, 1, a steel arch frame, 2, a backing plate, 21 bolt holes, 3 bolts, 4 arch springing reinforcing devices, 41 grouting holes, 42U-shaped notches, 43 bottom grout spreading holes and 5 tunnel surrounding rocks.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a reinforcing device and a construction method for improving the stability of an arch springing of a soil tunnel, wherein the excavation mode of the soil tunnel is that the soil tunnel is excavated by a two-step method, for example, a steel arch center 1, a backing plate 2, a bolt 3, an arch springing reinforcing device 4 and tunnel surrounding rock 5 are arranged in a figure 1, the steel arch center 1 is connected with the backing plate 2, the arch springing reinforcing device 4 is connected with the backing plate 2 through the bolt, and cement slurry is injected into the arch springing reinforcing device 4 to achieve the effect of improving the stability of the arch springing together with the whole device.
As shown in fig. 1 and 2, the steel arch center 1 is made of common hot-rolled common I-steel, the specific types are preferably I18, I20a, I20b, I22a and I22b, and the appropriate type of the I-steel can be selected according to actual conditions on site;
as shown in fig. 1 and 3, the backing plate 2 is made of common steel, has a thickness of 20mm, is square, has a side length of 400mm, is rounded at the periphery and has a radius of 25mm, the backing plate 2 is provided with four bolt holes 21 which are arranged in a square shape, and is convenient to be connected with a lower arch springing reinforcing device 4 through bolts 3, the backing plate 2 and the steel arch frame 1 are in full-welding connection, and the backing plate 2 is ensured to be in a horizontal state after welding;
as shown in fig. 1 to 4, the arch foot reinforcing device 4 is formed by welding steel plates, is a rectangular box, and has a length and a width of 500mm and a height of 200 mm; one side of the arch springing reinforcing device 4, which is close to the excavated tunnel, is provided with a grouting hole 41 with the aperture of 40mm, and the other three side surfaces are provided with U-shaped notches 42; the bottom of the arch foot reinforcing device 4 is provided with slurry dispersing holes 43 with the aperture of 20mm, and the holes are arranged in a quincunx shape; the arch springing reinforcing device 4 injects cement mortar mixed with a certain expanding agent through the grouting holes 41, the cement mortar expands to prop open the U-shaped groove opening 42, and the grout flowing out from the bottom grout dispersing holes 43 is combined to play a role in reinforcing the stratum below the arch springing;
the invention also provides a construction method of the reinforcing device for improving the stability of the soil tunnel arch springing, which comprises the following steps of:
step 5, arranging a foot-locking anchor rod, wherein the length of the anchor rod is 4m, the distance (ring x longitudinal) is 1.5m x 1.5m, and spraying concrete again until the designed thickness is 25 cm;
and 6, when the primary support strength of the upper step is stable, performing the next circulating tunnel excavation process.
Claims (7)
1. Auxiliary reinforcing apparatus of expansion arch springing, its characterized in that includes steel bow member (1), and welding has backing plate (2) bottom steel bow member (1), backing plate (2) bottom is connected with arch springing reinforcing apparatus (4).
2. The auxiliary reinforcement device for an enlarged arch springing as in claim 1, characterised in that said steel arch (1) is i-steel.
3. The expansion arch springing auxiliary reinforcing device according to claim 1, wherein the backing plate (2) is a square steel plate with a thickness of 15-20 mm, the side length of the backing plate (2) is not less than 1.5 times of the height of the steel arch (1), and four corners of the backing plate (2) are rounded with a radius of 25 mm.
4. An enlarged arch springing auxiliary reinforcing device according to claim 1, characterised in that the backing plate (2) is provided with a plurality of bolt holes (21), the plurality of bolt holes (21) are evenly distributed on the surface of the backing plate (2), and the plurality of bolt holes (21) are used for connecting the arch springing reinforcing device (4).
5. The expansion arch springing auxiliary reinforcing device according to claim 1, wherein the arch springing reinforcing device (4) is a steel plate welded cuboid box, the length and width of the arch springing reinforcing device (4) are 10cm longer than the side length of the backing plate (2), and the height of the arch springing reinforcing device (4) is 20 cm.
6. The expansion arch springing auxiliary reinforcing device according to claim 5, wherein a grouting hole (41) is formed in one side surface of the arch springing reinforcing device (4), the remaining three side surfaces of the arch springing reinforcing device (4) are respectively provided with a U-shaped notch (42), a plurality of grout scattering holes (43) are formed in the bottom of the arch springing reinforcing device (4), the diameter of each grout scattering hole (43) is 10-20 mm, and the grout scattering holes (43) are arranged in a quincunx shape.
7. The construction method of the expansion arch springing auxiliary reinforcing device adopts the expansion arch springing auxiliary reinforcing device of claims 1-6, and is characterized by comprising the following steps:
step 1, constructing a soil tunnel by adopting a two-step method, firstly excavating a soil body on an upper step of the tunnel, and carrying out expanding excavation on arch foot parts on the left side and the right side, and timely primarily spraying concrete;
step 2, paving a steel mesh and erecting a steel arch frame (1) on the upper step part;
step 3, welding backing plates (2) at the left and right arch springing positions, and installing arch springing reinforcing devices (4) in a bolt connection mode in time to ensure that the arch springing reinforcing devices (4) are firmly connected with the steel arch frame (1);
step 4, cement mortar mixed with a certain expanding agent is injected along the grouting holes (41) of the arch springing reinforcing device (4) to ensure that the slurry is fully filled;
step 5, setting a foot locking anchor rod, and spraying concrete again to the designed thickness;
and 6, performing the next circulating tunnel excavation process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210550895.0A CN114893222A (en) | 2022-05-20 | 2022-05-20 | Auxiliary reinforcing device for expanding arch springing and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210550895.0A CN114893222A (en) | 2022-05-20 | 2022-05-20 | Auxiliary reinforcing device for expanding arch springing and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114893222A true CN114893222A (en) | 2022-08-12 |
Family
ID=82723305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210550895.0A Withdrawn CN114893222A (en) | 2022-05-20 | 2022-05-20 | Auxiliary reinforcing device for expanding arch springing and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114893222A (en) |
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2022
- 2022-05-20 CN CN202210550895.0A patent/CN114893222A/en not_active Withdrawn
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Application publication date: 20220812 |
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