CN210948717U - Can follow protective housing formula energy-absorbing supporting construction that tunnel hoop let pressure - Google Patents
Can follow protective housing formula energy-absorbing supporting construction that tunnel hoop let pressure Download PDFInfo
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- CN210948717U CN210948717U CN201821711799.5U CN201821711799U CN210948717U CN 210948717 U CN210948717 U CN 210948717U CN 201821711799 U CN201821711799 U CN 201821711799U CN 210948717 U CN210948717 U CN 210948717U
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Abstract
The utility model discloses a protective shell type energy-absorbing supporting structure capable of yielding along the circumferential direction of a roadway, which comprises a plurality of protective shell filling bodies arranged along the circumferential direction of the roadway, wherein yielding protective shell filling bodies are connected between the protective shell filling bodies; after the casing filling body and the yielding casing filling body are spliced and connected, a pressure-relieving layer is arranged between the outer ring of the casing filling body and the surface of the surrounding rock of the roadway; the protective shell filling body comprises a protective shell, and a filling body I is arranged in the protective shell; the pressure protection shell filling body comprises a corrugated protection shell, and a filling body II is arranged inside the corrugated protection shell; the prestressed anchor bolts vertically penetrate along the surfaces of the outer ring and the inner ring of the protective shell; prestress is applied to the prestressed anchor bolt, radial extrusion can be generated on the protective shell and the internal filling body I, and the prestressed anchor bolt, the protective shell and the filling body I form a composite bearing structure together. When the surrounding rock pressure outside the roadway exceeds a certain value, the pressure-relieving layer can generate compression deformation, and the pressure-relieving protective shell filling body can contract inwards along the ring direction, so that the whole supporting structure realizes flexible pressure relief.
Description
Technical Field
The utility model relates to a tunnel support technical field especially relates to a can follow protective housing formula energy-absorbing supporting construction that tunnel hoop let pressure.
Background
Coal is the main energy for the rapid development of national economy in China. According to statistics, the quantity of coal resources buried deep in 1000m in China is 2.64 trillion tons, and accounts for about 47.4 percent of the total quantity of the coal resources in China. With the increasing exhaustion of shallow coal resources, the gradual change of coal mining to deep coal has become a necessary trend. Under the influence of deep high ground stress, high ground temperature, high osmotic water pressure and strong mining disturbance, deep rock mass will present destruction characteristics obviously different from shallow rock mass. The tunnel surrounding rock is greatly deformed, has strong rheological property and frequent roof fall disaster accidents, and also brings serious challenges to the safety and stable control of deep tunnels. At present, the traditional components for deep roadway support mainly include: anchor rods, anchor cables, U-shaped steel arch frames, sprayed concrete and the like. However, the above supporting form is difficult to completely meet the requirements of deep roadway for safety and use. For example, under the influence of strong excavation unloading effect, the deformation of surrounding rocks of a deep roadway is generally large and even reaches a meter level, but the elongation of the traditional supporting member is small, the large deformation and damage characteristics of the surrounding rocks are difficult to adapt, so that the surrounding rock-supporting is difficult to couple and cooperate with bearing, and the breakage phenomenon of the supporting member also occurs occasionally; in addition, under the traditional anchor net and cable frame supporting mode, due to the fact that surrounding rock pressure acting along the circumferential direction of a roadway is not uniform in size, failure and breakage of anchor rods or anchor cables of a supporting system are often started from a certain part, the problem of surrounding rock net bags is prominent, the wooden barrel effect of the supporting system is obvious, and the overall failure of the supporting system is easily caused; meanwhile, large deformation damage can be generated instantly after the surrounding rock of the deep roadway is excavated, but the traditional supporting members are required to be constructed on site, the process is complicated, the working procedures are more, and timely and reliable supporting resistance is difficult to provide for the excavated surrounding rock, so that the surrounding rock loses self-supporting capability due to excessive deformation damage at the initial excavation stage; the excavation construction progress of the roadway can be influenced by the field operation of the supporting member, so that the mining production of the mine is influenced; in addition, under the high ground stress environment of deep, the phenomenon such as spout layer fracture, falling piece also can appear in traditional anchor-spraying support, can weaken tunnel whole support intensity, also can bring serious threat to the normal transportation and the production in tunnel, also can produce a large amount of injection dusts in anchor-spraying support construction process simultaneously, produces adverse effect to site operation environment and workman healthy. The utility model provides a can follow protective housing formula energy-absorbing supporting structure that tunnel hoop let pressure can effectively solve above-mentioned series of problems.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems of low elongation, incapability of yielding to adapt to large deformation of surrounding rocks, non-uniform surrounding rock pressure action of a support system, obvious barrel effect, difficulty in immediate implementation, untimely surrounding rock support, excessive damage, complex implementation process, easy cracking, damage and chipping, poor anchor spraying operation environment and the like in the traditional support technologies such as deep tunnel anchor rods, anchor cables, U-shaped steel arches and sprayed concrete, the utility model provides a protective shell type energy-absorbing support structure capable of yielding along the circumferential direction of a tunnel, which can realize the flexible yielding of the support structure, timely release the internal strain energy of the surrounding rocks, ensure that the circumferential surrounding rock pressure action is more uniform, has high strength and can provide higher support resistance to the surrounding rocks; meanwhile, the supporting structure is a prefabricated structure, and only assembly is needed on site, so that the roadway excavation construction progress and the supporting construction quality can be effectively improved, the supporting construction labor intensity is reduced, and the purpose of improving the site operation environment can be achieved.
In order to achieve the above purpose, the specific technical solution of the present invention is as follows:
a protective shell type energy-absorbing supporting structure capable of yielding along the circumferential direction of a roadway comprises a plurality of protective shell filling bodies arranged along the circumferential direction of the section of the roadway, and yielding protective shell filling bodies are connected between adjacent protective shell filling bodies; after the protective shell filling body and the yielding protective shell filling body are spliced and connected, a pressure-relieving layer is arranged between the outer ring of the protective shell filling body and the surface of the surrounding rock of the roadway; each protective shell filling body comprises a protective shell, and a filling body I is arranged in the protective shell; each yielding protective shell filling body comprises a corrugated protective shell, and a filling body II is arranged in the corrugated protective shell; the outer ring surface sides of the protective shell and the corrugated protective shell are in contact with the pressure-relieving layer, and the inner ring surface side faces the inner space of the roadway; a plurality of opposite through holes at the same position are uniformly arranged on the outer ring surface and the inner ring surface of the protective shell at intervals, and prestressed anchor bolts are installed at the opposite through holes at the same position on the outer ring surface and the inner ring surface in a penetrating manner; the prestressed anchor bolt is vertical to the surfaces of the outer ring and the inner ring of the protective shell, and prestress is applied to the prestressed anchor bolt, so that the protective shell and the internal filling body I can be radially extruded, and the protective shell, the filling body I and the prestressed anchor bolt form a composite bearing structure together; the pressure-relieving layer can generate compression deformation under the action of the surrounding rock pressure of the external roadway; the protective casing fills and annotates the body and lets press the protective casing to fill and can follow the hoop and extrude each other under the effect of external tunnel country rock pressure, when extrusion force exceeded a certain set value between it, let press the protective casing and fill the body and can follow the hoop and contract inwards, make whole supporting construction realize the flexibility and let the pressure.
Furthermore, the yielding protective shell filling body is of a cylindrical structure with the same cross section along the axial direction of the roadway, and the length of the yielding protective shell filling body is consistent with the width of the protective shell filling body; the corrugated protective shell is respectively provided with a wavy fluctuation structure along the circumferential direction of the roadway on the side close to the pressure-relieving layer and the side of the internal space of the roadway; the strength of the filling body II is lower than that of the filling body I.
Furthermore, the prestressed anchor bolt rod bodies positioned at the central positions of the outer ring and the inner ring surfaces of the protective shell of each protective shell filling body are hollow, and after the plurality of protective shell filling bodies and the yielding protective shell filling bodies are spliced on site, the prestressed anchor bolt at the central position can be used for filling and applying a supporting structure slow-pressing layer.
Further, the prestressing force bolt body of rod of cavity form install near the protective case inner circle surface side end and fill the filling valve, the filling of slowly pressing the layer is carried out to the prestressing force anchor bolt outer end position of accessible central point portion when opening and fill the filling valve, treats to fill and annotates the completion back, can close it, avoids producing and fills the material outflow phenomenon.
Further, the material of the pressure-relieving layer includes, but is not limited to, foamed concrete, polymer chemical material.
Further, the materials of the protective shell, the corrugated protective shell and the prestressed anchor bolt include but are not limited to GFRP materials and steel materials.
Furthermore, the filling body I and the filling body II are manufactured in a mode of filling and pouring inside the protective shell and the corrugated protective shell respectively, the material of the filling body I comprises but is not limited to concrete and gravel and cement slurry filling bodies, and the material of the filling body II comprises but is not limited to foam concrete.
Furthermore, the manufacturing methods of the protective shell and the corrugated protective shell include, but are not limited to, direct pouring molding of a mold, welding and assembling, and mechanical connection and assembly.
Furthermore, the splicing mode of the plurality of protective shell filling bodies and the yielding protective shell filling body comprises but is not limited to bolt connection, bolt connection and tenon connection, and a water stop belt is arranged at the circumferential and axial splicing joint surface of the roadway of the protective shell filling body and the yielding protective shell filling body.
Furthermore, an opening is arranged on the surface side of one end part of the protective shell and the corrugated protective shell along the circumferential direction of the roadway or along the axial direction of the roadway; the opening is fitted with a sealing cap.
The utility model also provides a concrete method of doing of protecting shell formula energy-absorbing supporting construction that can let the pressure along tunnel hoop, including following step:
step (1-1), respectively processing and manufacturing a protective shell and a corrugated protective shell meeting the requirements according to the section size of the roadway and the design requirements of support, and respectively performing opening treatment on the surface side of one end part along the circumferential direction of the roadway or the surface side of one end part along the axial direction of the roadway;
step (1-2), mounting a prestressed anchor bolt on a perforation part along the same position of the outer ring surface and the inner ring surface of the protective shell, and pre-tightening for the first time;
step (1-3), respectively carrying out internal filling by using filling materials along the side opening parts of the protective shell and the corrugated protective shell in the step (1) to form a filling body I and a filling body II;
after the filling body I and the filling body II are solidified, performing surface wiping and leveling treatment on the opening side of the filling body I and the filling body II, and closing the opening side by using a sealing cover made of the same material as the protective shell and the corrugated protective shell;
step (1-5), pre-tightening the pre-stressed anchor bolt for the second time, and applying pre-stress to enable the pre-stressed anchor bolt to generate effective radial extrusion on the protective shell and the internal filling body I;
repeating the steps (1-1) - (1-5) to finish the prefabrication of a plurality of shell filling bodies and yielding shell filling bodies;
step (2-1), the plurality of manufactured protective shell filling bodies and the pressure protective shell filling bodies are moved to an engineering site;
step (2-2), after the roadway is excavated, the protective shell filling body and the yielding protective shell filling body are moved to the surface side of the surrounding rock and are spliced and connected along the annular direction of the roadway, and the construction of the supporting structure main body of the utility model is completed;
step (3-1), opening a filling valve of a prestressed anchor bolt at the central part of the surface of a filling body of the protective shell, filling a slow-pressing layer of a supporting structure along the section of the roadway in a sequence from bottom to top, and filling a gap between the supporting structure and the surface of surrounding rocks;
step (3-2), after the filling of the pressure-relieving layer is finished, closing a filling valve of a prestressed anchor bolt at the central part;
step (3-3), after the filling material of the pressure-relieving layer is solidified, finishing the construction of the pressure-relieving layer;
and step 4, finishing the construction of the protective shell type energy-absorbing supporting structure of the utility model, and carrying out the next working cycle.
The utility model has the advantages that:
1) the utility model discloses this kind of protective case formula energy-absorbing supporting construction is equipped with slowly presses the layer, can make the surrounding rock pressure distribution that acts on the supporting construction outside more even, avoids leading to the supporting construction local failure because produce stress concentration phenomenon, has solved the phenomenon of local stock, anchor rope rupture and supporting system cask effect that traditional tunnel anchor net cable supporting system appears;
2) the utility model discloses a protective case formula energy-absorbing supporting construction is equipped with along the tunnel hoop and lets press the protective case and fill the notes body, and supporting construction still is equipped with slowly presses the layer, can make supporting construction self produce the retraction, adapts to the big deformation destruction characteristic of deep tunnel country rock, cushions the country rock pressure effect, realizes letting press the supporting effect;
3) the main body structure of the protective shell type energy-absorbing supporting structure can be applied in advance before tunnel excavation and finished, and only needs to be assembled on site after tunnel excavation, so that the field application process of the traditional supporting member is avoided, the tunnel excavation construction progress can be greatly improved, timely and reliable supporting resistance can be immediately provided for surrounding rocks after tunnel excavation, and meanwhile, the dust pollution phenomenon in the anchor spraying application process is effectively avoided;
4) the utility model discloses a component materials such as protective housing, ripple protective housing of this kind of protective housing formula energy-absorbing supporting construction can be materials such as steel or GFRP, and the material selection scope is wider, and this type of material tensile strength is higher simultaneously, can carry out the cuff restraint to inside obturator material, realizes the intergrowth of both power, presents higher bearing strength, can avoid the fracture destruction phenomenon of traditional anchor spraying support, and when the material was GFRP material, still can effectively reduce the support component dead weight simultaneously, practices thrift transportation and construction cost, avoids meeting water on the spot and produces the corruption;
5) the utility model discloses the components such as protective shell, ripple protective shell, prestressed anchorage bolt that this kind of protective shell formula energy-absorbing supporting construction adopted can direct production by the wholesale, can strictly control each part component size specification, realize better tunnel section shaping effect, simultaneously because this kind of supporting construction is prefabricated assembled, still can solve the problem such as the traditional anchor-spray supporting construction in-process spout layer thickness inhomogeneous, construction quality is poor, effectively improve the construction quality of tunnel support;
6) the utility model discloses the obturator that this kind of protective case formula energy-absorbing supporting construction adopted can directly utilize tunnel excavation slabstone material to make. The method has the advantages that the method can be used for manufacturing the protective shell in a mode of filling roadway excavation slag stones once and filling secondary cement slurry for solidification directly, reutilization of the roadway excavation slag stones can be realized, the method is efficient and environment-friendly, and the cost of supporting materials can be reduced.
Drawings
The following detailed description of the embodiments of the present invention will be provided in conjunction with the accompanying drawings, which are included to explain the exemplary embodiments of the present invention and the description thereof, and are not intended to limit the present invention.
Fig. 1 is a schematic cross-sectional structure view of the protective-shell energy-absorbing supporting structure according to the embodiment of the present invention after the construction;
FIG. 2 is a left side view of section A-A of FIG. 1;
FIG. 3 is an enlarged, fragmentary, schematic view of the inflation portion of the crush can of FIG. 1;
FIG. 4 is an enlarged partial view of the prestressed anchorage bolt at 5 (B) in FIG. 1;
FIG. 5 is an enlarged partial view of the prestressed anchorage bolt at 5 (C) in FIG. 1;
wherein: 1-a shell-protecting filling body; 2-letting the pressure casing filling body; 3-protecting the shell; 4-a filler I; 5-prestressed anchor bolts; 6-corrugated protective shell; 7-a filler II; 8-a filling valve; 9-surrounding rock; 10-reduced pressure layer.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, aiming at the problems of low elongation rate, incapability of yielding to adapt to large deformation of surrounding rocks, difficulty in immediate completion of construction, untimely and excessive damage to the supporting of the surrounding rocks, complex construction process, easiness in cracking, damage and block falling, poor anchor spraying operation environment and the like in the traditional supporting technologies such as deep roadway anchor rods, anchor cables, U-shaped steel arches and sprayed concrete, the utility model provides a protective shell type energy-absorbing supporting structure capable of yielding along the annular direction of a roadway, which can realize the flexible yielding of the supporting structure and timely release strain energy inside the surrounding rocks, and the supporting structure has high supporting strength and can provide high supporting resistance to the surrounding rocks; meanwhile, the supporting structure is a prefabricated structure, and only assembly is needed on site, so that the roadway excavation construction progress and the supporting construction quality can be effectively improved, the supporting construction labor intensity is reduced, and the purpose of improving the site operation environment can be achieved. The utility model discloses can be used to multiple section forms's such as circular, rectangle, vertical wall semicircle, horseshoe tunnel support, use a specific structure that is used for the protective case formula energy-absorbing supporting construction of the GFRP material in circular tunnel as the example below, it is right with the embodiment to combine the figure below the utility model discloses do further the explanation.
Fig. 1 is a schematic cross-sectional structural view of a protective-shell energy-absorbing supporting structure according to an embodiment of the present invention after the protective-shell energy-absorbing supporting structure is completed, and fig. 2 is a left side view of a section a-a in fig. 1. The utility model provides a can follow protective shell formula energy-absorbing supporting construction that tunnel hoop let pressure, includes a plurality of protective shell that set up along tunnel section hoop and fills the body 1, and connects between the adjacent protective shell fills the body 1 and be equipped with 1 and let pressure protective shell and fill the body 2. Taking fig. 1-2 as an example, the protective-shell type energy-absorbing supporting structure includes 4 protective- shell filling bodies 1, and 4 yielding protective-shell filling bodies 2 are arranged between adjacent protective-shell filling bodies. After the protective shell filling body 1 and the yielding protective shell filling body 2 are spliced and connected, a pressure-relieving layer 10 is arranged between the outer ring of the protective shell filling body and the surface of the roadway surrounding rock 9; the slow-pressing layer 10 can generate compression deformation under the pressure action of the surrounding rock 9 of the external roadway; the material of the pressure-relieving layer 10 is foam concrete, and in addition, the material can also be a polymer chemical material and the like; the materials have certain compressibility and can generate compression deformation to a certain degree on the premise of ensuring certain supporting resistance, so that surrounding rock pressure acting on the outer side of the supporting structure can be distributed more uniformly through the slow-pressing layer, the local failure of the supporting structure due to stress concentration is avoided, and the phenomena of local breakage and support system barrel effect of a traditional roadway anchor net cable supporting system are solved.
Each protective shell filling body 1 comprises a protective shell 3, and a filling body I4 is arranged inside the protective shell 3; each yielding protective shell filling body 2 comprises a corrugated protective shell 6, and a filling body II 7 is arranged inside the corrugated protective shell 6; the outer ring surface sides of the protective shell 3 and the corrugated protective shell 6 are in contact with the slow-pressing layer 10, and the inner ring surface side faces the inner space of the roadway; a plurality of opposite through holes at the same position are uniformly arranged on the outer ring surface and the inner ring surface of the protective shell 3 at intervals, and prestressed anchor bolts 5 are installed at the opposite through holes at the same position on the outer ring surface and the inner ring surface in a penetrating manner; the prestressed anchor bolt 5 is perpendicular to the surfaces of the outer ring and the inner ring of the protective shell 3, and prestress is applied to the protective shell 3 and the internal filling body I4 to radially extrude, so that the protective shell 3, the filling body I4 and the prestressed anchor bolt 5 form a composite bearing structure together.
Fig. 3 is a partially enlarged structural view of the casing pressing inflator 2. The yielding protective shell filling body 2 is of a cylindrical structure with the same cross section along the axial direction of the roadway, and the length of the yielding protective shell filling body is consistent with the width of the protective shell filling body 1; the corrugated protective shell 6 is respectively provided with a wavy fluctuation structure along the circumferential direction of the roadway at the side close to the slow-pressing layer 10 and the side of the internal space of the roadway; the strength of the filling body II 7 is lower than that of the filling body I4. Through the setting, the protective casing fill body 1 with let press the protective casing fill body 2 and can follow the hoop and extrude each other under the effect of outside tunnel country rock 9 pressure, when the extrusion force exceeded a certain setting value between it, let press the protective casing and fill the body 2 and can follow the hoop and contract inwards. Therefore, the utility model discloses this kind of protective case formula energy-absorbing supporting construction utilizes to let to press the protective case and fills the notes body, and supporting construction still is equipped with slowly presses the layer, can make supporting system self produce the internal contraction to the big deformation destruction characteristic of adaptation deep tunnel country rock cushions the country rock pressure effect, realizes the flexible supporting effect of letting press.
Furthermore, the prestressed anchor bolts 5 (C) positioned at the central parts of the outer ring surface and the inner ring surface of the protective shell 3 of each protective shell filling body 1 are hollow. Fig. 5 shows a schematic view of a hollow prestressed anchor bolt 5 (C) in a partially enlarged configuration. After splicing of the plurality of the protective shell filling bodies 1 and the yielding protective shell filling body 2 on site is completed, the prestressed anchor bolt 5 (C) at the central part can be used for filling and applying the supporting structure slow-pressing layer 10.
Further, the hollow prestressed bolt 5 (C) body of rod install filling valve 8 near the inner circle surface side end of protective case 3, when opening filling valve 8, the filling of slowly pressing layer 10 is carried out to the prestressed anchor bolt 5 (C) outer end position of accessible central part, and after filling the completion, can close it, avoids producing and fills the material outflow phenomenon.
Furthermore, the protective shell 3, the corrugated protective shell 6 and the prestressed anchor bolt 5 are made of GFRP materials, and besides, the materials can also be made of steel. The filling body I4 and the filling body II 7 are manufactured in a mode of filling and pouring in the protective shell 3 and the corrugated protective shell 6 respectively, the filling body I4 is made of concrete, in addition, the material can also be a gravel and cement slurry filling body, and the filling body II 7 is made of foam concrete. The material selection range of the material is wide. Moreover, the protective shell 3 and the corrugated protective shell 6 are made of GFRP materials or steel materials, so that the tensile strength is high, and the filling bodies I4 and II 7 are made of concrete materials, so that the compressive strength is high. The external GFRP material or steel can perform hoop restraint on the internal filling material, so that the two materials can coexist, higher bearing strength is presented, the cracking and damage phenomena of the traditional anchor-spraying support can be avoided, meanwhile, when the material is the GFRP material, the dead weight of the support component can be effectively reduced, the transportation and construction cost is saved, and the corrosion caused by water on site is avoided. In addition, when the I4 material of the filling body is manufactured in a mode of' filling the roadway excavation slag stones once and filling and solidifying secondary cement slurry in the protective shell, the secondary utilization of the roadway excavation slag stones can be realized, the efficiency and the environmental protection are realized, and the cost of supporting materials can be reduced.
Furthermore, the manufacturing mode of the protective shell 3 and the corrugated protective shell 6 is that the mold is directly cast and molded, and in addition, the manufacturing mode can also be a welding assembly mode and a mechanical connection assembly mode.
Furthermore, the plurality of the protective shell filling bodies 1 and the yielding protective shell filling body 2 are connected in a tenon mode. Specifically, the splicing joint between the protection shell filling body 1 and the yielding protection shell filling body 2 is a concave-convex joint, and the joint of the yielding protection shell filling body 2 can be embedded and connected between the protection shell filling bodies 1. In addition, the splicing mode can also be a bolt type connection and bolt connection mode, and the protective shell filling body 1 and the yielding protective shell filling body 2 are provided with water stops at the circumferential and axial splicing surfaces of the roadway.
Furthermore, an opening is arranged on the surface side of one end part of the protective shell 3 and the corrugated protective shell 6 along the roadway ring direction or the surface side of one end part along the roadway shaft direction; the opening is fitted with a sealing cap. The side opening allows the interior of the sheath 3 and the corrugated sheath 6 to be filled with the filler.
The utility model also provides a concrete method of doing of protecting shell formula energy-absorbing supporting construction that can let the pressure along tunnel hoop, including following step:
step 1: according to the size of the section of the roadway and the design requirement of support, respectively processing and manufacturing a protective shell 3 and a corrugated protective shell 6 which meet the requirement, and respectively performing opening treatment on the surface side of one end part along the circumferential direction of the roadway or the surface side of one end part along the axial direction of the roadway;
step 2: mounting a prestressed anchor bolt 5 at the same position of the outer ring surface and the inner ring surface of the protective shell 3, pre-tightening once, and primarily fixing the prestressed anchor bolt 5 through the pre-tightening once;
and step 3: respectively carrying out internal filling by using filling materials along the side opening parts of the protective shell 3 and the corrugated protective shell 6 in the step 1 to form a filling body I4 and a filling body II 7;
and 4, step 4: after the filling body I4 and the filling body II 7 are solidified, the side of the opening part is subjected to plastering and leveling treatment, and the side opening is closed by using a sealing cover made of the same material as the protective shell 3 and the corrugated protective shell 6;
and 5: the prestressed anchor bolt 5 is pre-tightened for the second time, prestress is applied, the prestress value applied at the stage is higher, and the secondary pre-tightening can enable the prestressed anchor bolt to generate effective radial extrusion on the protective shell 3 and the internal filling body I4;
step 6: repeating the steps 1-5 to complete the manufacture of a plurality of protective shell filling bodies 1 and yielding protective shell filling bodies 2;
and 7: moving the plurality of manufactured protective shell filling bodies 1 and the yielding protective shell filling bodies 2 to an engineering site;
and 8: after the roadway is excavated, the protective shell filling body 1 and the yielding protective shell filling body 2 are moved to the surface side of the surrounding rock 9 and are spliced and connected along the annular direction of the roadway, and the construction of the supporting structure main body of the utility model is completed;
and 7: opening a filling valve 8 of a prestressed anchor bolt 5 (C) in the central part of the surface of the protective shell filling body 1, filling a slow-pressing layer 10 of a supporting structure along the section of the roadway from bottom to top, and filling a gap between the supporting structure and the surface of a surrounding rock 9;
step 10: after slowly pressing layer 10 fills and annotates the completion, close the notes fill valve 8 that the prestressed anchorage who centers on position tied 5 (C), treat slowly pressing layer 10 and fill the notes material solidification back, accomplish the utility model discloses the execution of this kind of protective case formula energy-absorbing supporting construction does.
The main structure of the protective shell type energy-absorbing supporting structure can be used in advance before roadway excavation, the roadway excavation can be completed only by assembling on site after the roadway excavation, the site construction process of supporting members such as traditional anchor rods, anchor cables and U-shaped steel arches is avoided, the roadway excavation construction progress can be greatly improved, timely and reliable supporting resistance can be immediately provided for surrounding rocks after the roadway excavation, and meanwhile, the dust pollution phenomenon in the anchor spraying construction process is effectively avoided. Meanwhile, the components such as the protective shell 3, the corrugated protective shell 6 and the prestressed anchor bolt 5 adopted by the supporting structure can be directly produced in batch, the size and specification of each component can be strictly controlled, and a better roadway section forming effect is realized.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A protective shell type energy-absorbing supporting structure capable of yielding along the circumferential direction of a roadway is characterized by comprising a plurality of protective shell filling bodies arranged along the circumferential direction of the section of the roadway, and yielding protective shell filling bodies are connected between adjacent protective shell filling bodies; after the protective shell filling body and the yielding protective shell filling body are spliced and connected, a pressure-relieving layer is arranged between the outer ring of the protective shell filling body and the surface of the surrounding rock of the roadway; each protective shell filling body comprises a protective shell, and a filling body I is arranged in the protective shell; each yielding protective shell filling body comprises a corrugated protective shell, and a filling body II is arranged in the corrugated protective shell; the outer ring surface sides of the protective shell and the corrugated protective shell are in contact with the pressure-relieving layer, and the inner ring surface side faces the inner space of the roadway; a plurality of opposite through holes at the same position are uniformly arranged on the outer ring surface and the inner ring surface of the protective shell at intervals, and prestressed anchor bolts are installed at the opposite through holes at the same position on the outer ring surface and the inner ring surface in a penetrating manner; the prestressed anchor bolt is vertical to the surfaces of the outer ring and the inner ring of the protective shell, and prestress is applied to the prestressed anchor bolt, so that the protective shell and the internal filling body I can be radially extruded, and the protective shell, the filling body I and the prestressed anchor bolt form a composite bearing structure together; the pressure-relieving layer can generate compression deformation under the action of the surrounding rock pressure of the external roadway; the protective casing fills and annotates the body and lets press the protective casing to fill and can follow the hoop and extrude each other under the effect of external tunnel country rock pressure, when extrusion force exceeded a certain set value between it, let press the protective casing and fill the body and can follow the hoop and contract inwards, make whole supporting construction realize the flexibility and let the pressure.
2. The protective-shell type energy-absorbing supporting structure capable of yielding along the circumferential direction of a roadway according to claim 1, wherein the yielding protective-shell filling body is a cylindrical structure with the same cross section along the axial direction of the roadway, and the length of the yielding protective-shell filling body is consistent with the width of the protective-shell filling body; the corrugated protective shell is respectively provided with a wavy fluctuation structure along the circumferential direction of the roadway on the side close to the pressure-relieving layer and the side of the internal space of the roadway; the strength of the filling body II is lower than that of the filling body I.
3. The energy-absorbing shield structure according to claim 1, wherein the prestressed anchor bolt body located at the center of the surface of the outer ring and the inner ring of the shield of each shield filling body is hollow.
4. A protective shell type energy-absorbing supporting structure capable of yielding in the circumferential direction of a roadway as claimed in claim 3, wherein the hollow prestressed bolt rod body is provided with a filling valve at the end part close to the surface side of the inner ring of the protective shell.
5. The energy-absorbing shield structure capable of yielding circumferentially along a roadway according to claim 1, wherein the material of the pressure-relieving layer includes, but is not limited to, foamed concrete and polymer chemical material.
6. The energy-absorbing shield structure capable of yielding circumferentially along a roadway as claimed in claim 1, wherein the material of the shield, the corrugated shield and the prestressed anchor bolt includes but is not limited to GFRP material and steel material; the material of the filling body I comprises but is not limited to concrete and gravel and cement slurry filling bodies, and the material of the filling body II comprises but is not limited to foam concrete.
7. The energy-absorbing shield structure capable of yielding according to the circumferential direction of the roadway according to claim 1, wherein the joining manner of the plurality of shield filling bodies and yielding shield filling bodies includes, but is not limited to, bolt connection, and tenon connection, and water stop belts are disposed on the joining faces of the shield filling bodies and yielding shield filling bodies in the circumferential direction and the axial direction of the roadway.
8. The energy-absorbing supporting structure of claim 1, wherein an opening is provided on the surface side of one end of the protecting shell and the corrugated protecting shell in the circumferential direction of the roadway or on the surface side of one end of the protecting shell and the corrugated protecting shell in the axial direction of the roadway; the opening is fitted with a sealing cap.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488342A (en) * | 2018-10-22 | 2019-03-19 | 山东建筑大学 | A kind of hoop shell perfusion type flexibility for roadway support, which allows, pressure lining cutting and applies method |
| CN112780302A (en) * | 2021-01-22 | 2021-05-11 | 中山大学 | Tunnel energy-consumption supporting structure and construction method |
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2018
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488342A (en) * | 2018-10-22 | 2019-03-19 | 山东建筑大学 | A kind of hoop shell perfusion type flexibility for roadway support, which allows, pressure lining cutting and applies method |
| CN109488342B (en) * | 2018-10-22 | 2024-03-22 | 山东建筑大学 | Hoop shell filling type flexible yielding lining for roadway support and construction method |
| CN112780302A (en) * | 2021-01-22 | 2021-05-11 | 中山大学 | Tunnel energy-consumption supporting structure and construction method |
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