CN217735499U - A advance support structure, compound jet grouting pile for extremely soft rock tunnel face - Google Patents
A advance support structure, compound jet grouting pile for extremely soft rock tunnel face Download PDFInfo
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- CN217735499U CN217735499U CN202221734555.5U CN202221734555U CN217735499U CN 217735499 U CN217735499 U CN 217735499U CN 202221734555 U CN202221734555 U CN 202221734555U CN 217735499 U CN217735499 U CN 217735499U
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Abstract
The utility model discloses a advance support structure, compound jet grouting pile for extremely soft rock tunnel face. This advance support structure comprises a plurality of level composite jet grouting piles that set up in the face position, the composite jet grouting pile of level sets up along the tunnel trend, just the composite jet grouting pile of level comprises the pile of level jet grouting with set up the strengthening rib in the pile of level jet grouting. The forepoling structure of the composite jet grouting pile has simple construction process, the BFRP rib is directly inserted into the machine horizontally after the horizontal jet grouting pile is formed, the hole does not need to be drilled again, the time is saved, and the shoring effect is better; and, owing to adopted BFRP muscle novel material, environmental protection more, in the broken tear-open after the structure construction is accomplished, because the shear strength of BFRP muscle is little, effectively solved the difficult problem of tearing open of using reinforcing bar stock, broken tear-open for advance support construction and tunnel excavation has practiced thrift the time.
Description
Technical Field
The utility model belongs to the technical field of the tunnel construction, especially, relate to a compound jet grouting pile that is used for advance support structure of extremely soft rock tunnel face and is used for extremely soft rock tunnel face advance support.
Background
In the tunnel excavation in the extremely soft rock area, because the physical characteristics of rock-soil bodies are poor, the deformation and the damage of a tunnel face and surrounding rocks are easily caused, and in order to avoid the situation, the surrounding rocks at the position of the tunnel face need to be supported in advance. Traditional face stock support mode needs to bore the hole earlier, clears up the hole, sets up stock and slip casting again, and technology is loaded down with trivial details to do not obviously improve the physical characteristic of face front core soil, broken tearing open when adopting the reinforcing bar stock in addition and led to the fact the construction difficulty to tunnel excavation.
The existing mode of laying horizontal jet grouting piles is popularized in advance support. However, when the tunnel face of the extremely soft rock tunnel is reinforced in advance by adopting a certain structure, the characteristics of the rock and soil mass of the tunnel face need to be improved, and meanwhile, the structure also needs strong tensile strength to ensure the stability of the tunnel face. Therefore, the structural arrangement mode of the existing single horizontal jet grouting pile cannot meet the stability of the tunnel face.
Therefore, the technical problem is solved by designing a composite structure in the prior art, for example, the prior art with publication number CN207829905U and name "a wind-blown sand stratum undercut tunnel advanced three-dimensional supporting structure" discloses the applicability of the horizontal jet grouting pile in the wind-blown sand area, and discloses the arrangement positions of the horizontal jet grouting pile for the face advanced support, which are respectively arranged in the arch wall and the face.
However, in such composite structures, the arrangement positions of the horizontal jet grouting piles in the tunnel are mostly only at the position of the tunnel arch wall, and are also commonly arranged at the tunnel face, which has the defect of high cost, and the arrangement of the horizontal jet grouting piles on the arch wall and the tunnel face causes great manpower and material resource consumption.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects and shortcomings of the prior art, the first object of the present invention is to provide a forepoling structure for the tunnel face of extremely soft rock.
In order to overcome the defects and shortcomings of the prior art, the utility model discloses a further object is to provide a compound jet grouting pile for advance support of the tunnel face of the extremely soft rock tunnel.
The utility model is realized like this, the utility model discloses a advance support structure for extremely soft rock tunnel face, this structure comprises a plurality of levels of setting at face position compound jet grouting pile, the compound jet grouting pile of level is along the tunnel trend setting of current construction position, just the compound jet grouting pile of level comprises the level jet grouting pile and the strengthening rib that sets up in the level jet grouting pile.
Preferably, a plurality of horizontal composite jet grouting piles are uniformly distributed on the upper half part of the tunnel face.
Preferably, the reinforcing rib is a fiber reinforced composite FRP rib.
Preferably, the FRP rib is selected from any one of BFRP rib, GFRP rib, and CFRP rib.
Preferably, the reinforcing ribs are BFRP ribs made of basalt fiber materials.
The utility model further discloses a compound spouts stake soon for extremely soft rock tunnel face advance support, this compound spouts stake soon comprises concrete placement's spout stake soon and the strengthening rib that sets up in the stake is spouted soon to the level.
Preferably, the reinforcing rib is a fiber reinforced composite FRP rib.
Preferably, the FRP rib is selected from any one of BFRP rib, GFRP rib, and CFRP rib.
Preferably, the reinforcing ribs are BFRP ribs made of basalt fiber materials.
The single horizontal jet grouting pile may not satisfy the stability of face, and composite support structure construction, abolish loaded down with trivial details, the utility model discloses an overcome prior art's is not enough, provide an advance support structure for extremely soft rock tunnel face and be used for extremely soft rock tunnel face advance support's composite jet grouting pile. Compare in prior art's shortcoming and not enough, the utility model discloses following beneficial effect has:
the utility model discloses in the compound jet grouting pile, through setting up the strengthening rib in the middle of the horizontal jet grouting pile to make strengthening rib and horizontal jet grouting pile combine together, the strengthening rib is for the fibre reinforced composite FRP muscle including BFRP muscle, GFRP muscle, CFRP muscle, preferably the BFRP muscle that basalt fiber material made. Taking the BFRP bar as an example, the surface of the reinforcing bar is provided with the raised thread, so that the friction force between the BFRP bar and the horizontal jet grouting pile can be increased, the structure has higher tensile strength, and the damage caused by pulling is avoided. This compound jet grouting pile structure is through the mode that two kinds of single structures combined together, horizontal jet grouting pile and novel BFRP muscle material have been used, wherein, the effect of horizontal jet grouting pile mainly is the physical characteristics who improves the face ground body, and have the function of preventing the quicksand and gushing water, it is the same with the effect of traditional horizontal jet grouting pile, BFRP muscle effect is the tensile strength who increases whole structure, shear strength is low simultaneously, break easily and tear open, combine both together, not only reached and used traditional horizontal jet grouting pile to improve advantages such as soil physical characteristics on every side, again through using the BFRP muscle to increase the tensile strength of structure, utilized their advantage to carry out face advance support promptly respectively, make the structure have the advantage that tensile strength is big and can improve the soil body characteristic on every side simultaneously.
In the utility model discloses in advance support structure, adopt the utility model discloses compound jet grouting pile can improve the physical characteristic of face ground body, and the tensile strength of overall structure can be strengthened to the middle BFRP muscle that sets up, and compared with the prior art, this advance support structure construction simple process directly inserts the BFRP muscle through the machine level after the shaping of horizontal jet grouting pile, does not need to drill once more, has saved the time, and the support effect is better; and, owing to adopted BFRP muscle novel material, environmental protection more, in the broken tear-open after the structure construction is accomplished, because BFRP muscle's shear strength is little, effectively solved the difficult problem of tearing open of using the reinforcing bar stock, for advance support construction and tunnel excavation break-open the time of having practiced thrift.
Drawings
Fig. 1 is a schematic cross-sectional structure view of an embodiment of the composite jet grouting pile of the present invention;
FIG. 2 is a schematic longitudinal cross-sectional view of the composite jet grouting pile shown in FIG. 1;
FIG. 3 is a schematic longitudinal cross-sectional structure view of BFRP ribs in the composite jet grouting pile shown in FIG. 1;
fig. 4 is the distribution schematic diagram of the composite rotary jet grouting piles on the tunnel face in the advance support structure of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1-3, the utility model discloses a composite jet grouting pile 1 for advance support of the tunnel face of extremely soft rock, which comprises a horizontal jet grouting pile 1-1 cast by concrete and a reinforcing rib 1-2 arranged in the horizontal jet grouting pile 1-1.
In the composite jet grouting pile 1 of the utility model, the reinforcing rib 1-2 is arranged in the middle of the horizontal jet grouting pile 1-1, so that the reinforcing rib 1-2 is combined with the horizontal jet grouting pile 1-1. The reinforcing rib 1-2 has the characteristics of low shear strength, easy breaking and dismantling and environmental protection, and the surface of the reinforcing rib 1-2 is provided with the raised threads, so that the friction force between the reinforcing rib 1-2 and the horizontal jet grouting pile 1-1 can be increased, the structure has higher tensile strength, and the structure is ensured not to be damaged by pulling.
Further, the material meeting the property requirements of the reinforcing rib 1-2 is a fiber reinforced composite material FRP rib including a BFRP rib, a GFRP rib and a CFRP rib, wherein the BFRP rib made of basalt fiber material is preferred in consideration of comprehensive performance, cost and other factors. Taking the BFRP bar as an example, the surface of the reinforcing rib 1-2 is provided with a raised thread, so that the friction force between the BFRP bar and the horizontal jet grouting pile 1-1 can be increased, the structure has higher tensile strength, and the horizontal jet grouting pile is ensured not to be damaged by pulling.
In the embodiment of the present invention, the composite jet grouting pile 1 can be applied to a forepoling structure, especially a forepoling structure of a tunnel face 2 of a very soft rock, and the composite jet grouting pile 1 is uniformly arranged on the upper half of the tunnel face 2 in a horizontal direction and in the same direction as the tunnel. Because the composite jet grouting pile 1 structure uses the horizontal jet grouting pile 1-1 and a novel BFRP (bidirectional forwarding protocol) reinforcement material through a mode of combining two single structures, wherein the horizontal jet grouting pile 1-1 mainly has the function of improving the physical characteristics of a rock-soil body on a tunnel face 2 and has the functions of preventing flowing sand and gushing water, has the same function as the traditional horizontal jet grouting pile 1-1, has the function of increasing the tensile property of the whole structure, has low shear strength and is easy to break and disassemble, and the two are combined together, thereby not only achieving the advantages of improving the physical characteristics of surrounding soil by using the traditional horizontal jet grouting pile 1-1, but also increasing the tensile strength of the structure by using the BFRP reinforcement, namely respectively utilizing the advantages of the horizontal jet grouting pile 1 and the shear strength to carry out tunnel face advanced support, and enabling the structure to have the advantages of large tensile strength and improving the characteristics of surrounding soil body.
The utility model discloses a leading supporting construction for extremely soft rock tunnel face, this structure comprises a plurality of levels of setting in face 2 positions compound spout stake 1 soon, the compound tunnel trend setting along the current position of being under construction of the compound spout stake of level 1 soon, just the compound spout stake 1 soon of level comprises the compound spout stake 1-1 of level and the strengthening rib 1-2 that sets up in the compound spout stake 1-1 of level soon.
In the embodiment of the present invention, as shown in fig. 1 to 3, a reinforcing rib 1-2 is provided in the middle of a horizontal jet grouting pile 1-1, so that the reinforcing rib 1-2 is combined with the horizontal jet grouting pile 1-1. The reinforcing rib 1-2 has the characteristics of low shear strength, easy breaking and dismantling and environmental protection, and the surface of the reinforcing rib 1-2 is provided with the raised threads, so that the friction force between the reinforcing rib 1-2 and the horizontal jet grouting pile 1-1 can be increased, the structure has higher tensile strength, and the structure is ensured not to be damaged by pulling.
Further, the material meeting the property requirements of the reinforcing rib 1-2 is a fiber reinforced composite material FRP rib including a BFRP rib, a GFRP rib and a CFRP rib, wherein the BFRP rib made of basalt fiber material is preferred in consideration of comprehensive performance, cost and other factors. Taking the BFRP rib as an example, the surface of the reinforcing rib 1-2 is provided with a raised thread, so that the friction force between the BFRP rib and the horizontal jet grouting pile 1-1 can be increased, the structure has higher tensile strength, and the damage to the structure is avoided.
The horizontal composite jet grouting piles 1 are arranged at the position of the face 2, and the number, the density and the position of the horizontal composite jet grouting piles 1 on the face 2 can be determined by calculation according to actual application requirements. In the embodiment of the present invention, a more specific application is provided, as shown in fig. 4, a plurality of horizontal composite jet grouting piles 1 are uniformly arranged on the upper half of the tunnel face 2 in the advance support structure.
The utility model discloses in, this advance support structure's construction method includes following step:
(1) The pile driver is in place;
(2) Drilling a hole at a pre-designed position of the face 2, and inserting a sleeve after reaching a designed depth (the diameter of the horizontal jet grouting pile 1-1 is designed to be 50cm, and the length is designed to be 15 m);
(3) Inserting a grouting pipe into the sleeve, and preparing cement slurry;
(4) After the slurry is pressurized, the slurry starts to be sprayed, the sleeve and the grouting pipe are lifted simultaneously, and the grouting pipe is lifted in a rotating manner;
(5) After the sleeve and the grouting pipe are taken out, BFRP ribs with the same depth as the designed depth are horizontally inserted into the position of the grouting pipe (the length of the reinforcing rib 1-2 is slightly less than that of the horizontal jet grouting pile 1-1, and the diameter of the reinforcing rib 1-2 needs to be designed according to the field situation);
(6) And cleaning the cement slurry overflowing during the insertion.
In the embodiment of the utility model, in this advance support structure of extremely soft rock tunnel face, because compound jet grouting pile 1 structure is through the mode that two kinds of single structures combined together, horizontal jet grouting pile 1-1 and novel BFRP muscle material have been used, wherein, the effect of horizontal jet grouting pile 1-1 mainly is the physical properties that improves the 2 ground bodies of face, and have the function of preventing flowing sand and gushing water, it is the same with the effect of traditional horizontal jet grouting pile, the BFRP muscle effect is the tensile strength who increases whole structure, simultaneously shear strength is low, break easily and tear open, combine both together, not only reached and used traditional horizontal jet grouting pile 1-1 to improve advantages such as soil physical properties on every side, the tensile strength of structure has been increased through using the BFRP muscle again, utilized their advantage respectively promptly and carried out face 2 advance support, make the structure have tensile strength simultaneously big and can improve the advantage of soil body characteristic on every side.
In addition, compared with the prior art, the composite jet grouting pile 1 of the utility model is arranged on the tunnel face 2, and the vault can be supported in a conventional advance support mode, such as a small advanced duct, so that the vault is reinforced and the tunnel face 2 is reinforced; the construction process of the advanced supporting structure is simple, BFRP ribs are directly horizontally inserted into the advanced supporting structure through a machine after the horizontal jet grouting pile 1-1 is formed, secondary drilling is not needed, the time is saved, and the supporting effect is better.
Finally, because the novel material of BFRP muscle has been adopted, environmental protection more, in the broken tear-open after the structure construction is accomplished, because the shear strength of BFRP muscle is little, effectively solved the difficult problem of tearing open of using the reinforcing bar stock, for advance support construction and tunnel excavation break-open the time of having practiced thrift.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (9)
1. The utility model provides a advance support structure for extremely soft rock tunnel face, its characterized in that, this structure comprises a plurality of levels of setting in the face position compound jet grouting pile, the compound jet grouting pile of level is along the tunnel trend setting of current construction position, just the compound jet grouting pile of level comprises the compound jet grouting pile of level and the strengthening rib that sets up in the compound jet grouting pile of level.
2. The advance support structure of claim 1, wherein a plurality of the horizontal composite jet grouting piles are uniformly arranged on the upper half part of the tunnel face.
3. The advance support structure of claim 1, wherein the reinforcing bars are fiber reinforced composite FRP bars.
4. A forepoling structure as claimed in claim 3, wherein the FRP reinforcement is selected from any one of BFRP reinforcement, GFRP reinforcement and CFRP reinforcement.
5. A advance support structure as claimed in claim 4, wherein the reinforcing bars are BFRP bars made of basalt fibre material.
6. The composite jet grouting pile for the advance support of the tunnel face of the extremely soft rock tunnel is characterized by comprising a concrete poured jet grouting pile and a reinforcing rib arranged in a horizontal jet grouting pile.
7. The composite jet grouting pile of claim 6, wherein the reinforcing rib is a fiber reinforced composite FRP rib.
8. The composite jet grouting pile of claim 7, wherein the FRP rib is selected from any one of BFRP rib, GFRP rib and CFRP rib.
9. The composite jet grouting pile of claim 8, wherein the reinforcing ribs are BFRP ribs made of basalt fiber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221734555.5U CN217735499U (en) | 2022-07-06 | 2022-07-06 | A advance support structure, compound jet grouting pile for extremely soft rock tunnel face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221734555.5U CN217735499U (en) | 2022-07-06 | 2022-07-06 | A advance support structure, compound jet grouting pile for extremely soft rock tunnel face |
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| Publication Number | Publication Date |
|---|---|
| CN217735499U true CN217735499U (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221734555.5U Active CN217735499U (en) | 2022-07-06 | 2022-07-06 | A advance support structure, compound jet grouting pile for extremely soft rock tunnel face |
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| CN (1) | CN217735499U (en) |
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2022
- 2022-07-06 CN CN202221734555.5U patent/CN217735499U/en active Active
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