CN218439399U - Auxiliary supporting device for tunnel inverted arch construction - Google Patents
Auxiliary supporting device for tunnel inverted arch construction Download PDFInfo
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- CN218439399U CN218439399U CN202222825517.7U CN202222825517U CN218439399U CN 218439399 U CN218439399 U CN 218439399U CN 202222825517 U CN202222825517 U CN 202222825517U CN 218439399 U CN218439399 U CN 218439399U
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Abstract
The utility model relates to the technical field of tunnel engineering, in particular to an auxiliary supporting device for tunnel inverted arch construction; the auxiliary supporting device comprises a first supporting structure, a second supporting structure of an inverted triangular structure and a third supporting structure, and the first supporting structure, the second supporting structure and the third supporting structure act together to form a supporting system for effectively and temporarily reinforcing the primary supporting structure of the tunnel and surrounding rocks of the primary supporting structure, so that the pressure bearing of the weak geology at the front end of the inverted arch excavation area of the weak surrounding rock structure is enhanced to prevent the slippage of soil at the front part and the side direction of the tunnel, and the supporting capability of the primary supporting of the tunnel of the weak surrounding rock can be effectively improved; and by combining a three-step excavation method, the core soil stabilization tunnel face is reserved on the two steps, the speed of the settlement and convergence of the tunnel tending to stability is accelerated, the construction safety problem can be effectively solved, the purpose of rapid construction is achieved, and the construction cost is greatly reduced.
Description
Technical Field
The utility model relates to a tunnel engineering technical field, what specifically say is an auxiliary stay device that tunnel invert construction was used.
Background
The common construction method of the highway tunnel is a new Austrian construction method, and the main operation sequence is as follows: the method comprises the following steps of surrounding rock excavation, preliminary bracing, inverted arch construction, secondary lining concrete mold injection, auxiliary engineering and the like, wherein the inverted arch construction is a key process of tunnel construction, the inverted arch construction actually carries out lower connection on a circumferential steel arch frame of the preliminary bracing to realize integral closed loop of the steel arch frame, and then a concrete structure layer is poured on the closed loop steel arch frame to provide safety guarantee for subsequent excavation of the tunnel.
During construction, after a cave is excavated for a certain distance (generally about 1 m), an annular I-steel arch frame is immediately arranged on an exposed rock stratum surface in the cave, and the exposed rock stratum surface is sealed by spraying cement concrete to form a primary supporting structure so as to prevent soil body falling, lateral extrusion, vault sinking, collapse and the like of the exposed rock stratum surface (or called a free surface); at the primary supporting structure finishing stage, the spherical body on the cross section of the tunnel structure is only constructed at the upper half part, and the lower half part can be continued until the surrounding rock after the primary supporting structure is finished is stable; during the process, the settlement (vault settlement) and convergence (the rate of the deformation of the left and right arch waists towards the free face) of the tunnel cavern are continuously observed to determine the time node of the inverted arch construction of the tunnel. Under the normal condition, after the primary supporting structure of the tunnel is completed, the settlement and the convergence gradually become stable along with time until the design requirements are met, and then the inverted arch construction is carried out, but when the geological condition of the weak surrounding rock of the tunnel is unstable, the settlement and the convergence values of the tunnel cannot meet the design requirements, so that the excavation of the lower half part and the inverted arch construction cannot be carried out according to the preset plan, the contradiction between the construction safety and the progress is prominent, and the subsequent construction of the tunnel is seriously influenced.
The primary support reinforcing measures commonly adopted in the prior art mainly include the following two measures:
firstly, double-deck steel bow member reinforcement measure: installing a temporary steel arch under the existing steel arch to form a double-layer steel arch structure supporting system, and dismantling the lower-layer temporary steel arch after construction is finished; the construction method has the defects of high construction difficulty and long construction period, the construction of the lower-layer temporary steel arch is carried out below the original steel arch, the clearance height of a tunnel can be violated, the working surface is limited, the construction operation of each subsequent process is difficult, the construction operation difficulty is high, and the construction period is long.
Secondly, large pipe shed reinforcing measures: installing a steel sleeve arch below the existing steel arch, beating a phi 108mm seamless steel pipe on the steel sleeve arch along the annular direction, upwards and obliquely passing through the primary support steel arch, and pressing and injecting cement mortar to form a primary support for temporarily reinforcing the large pipe shed, and dismantling the large pipe shed sleeve arch after the inverted arch construction is finished; the method has the defects that although the method has a limiting effect on arch crown sinking, the horizontal stress effect is poor, and the tunnel convergence hardly meets the requirement of safe construction.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an effectively improve weak surrounding rock tunnel preliminary bracing's support ability and simple structure's auxiliary stay device of tunnel invert construction usefulness.
The utility model provides an auxiliary stay device that tunnel inverted arch construction was used sets up a plurality of structural steel bow member and every in advance on the inner wall in tunnel an inverted arch steel bow member is all connected at the both ends of structural steel bow member, auxiliary stay device includes a plurality of respectively with every first bearing structure and a plurality of that structural steel bow member both ends are connected respectively the structural steel bow member with second bearing structure between the first bearing structure, second bearing structure includes first bracing piece, second bracing piece and third bracing piece, the one end fixed connection of first bracing piece is in the top of structural steel bow member, the one end of second bracing piece with the one end of third bracing piece is located respectively the both sides of the one end of first bracing piece, the other end of second bracing piece and the other end of third bracing piece all fixed connection be in the middle part of first bearing structure, the second bracing piece with the third bracing piece about first bracing piece is bilateral symmetry and distributes, auxiliary stay device still includes a plurality of fixed connection and is adjacent third bearing structure between two first bearing structure.
The utility model has the advantages and beneficial effect: first bearing structure is connected the back with preliminary bracing's structural steel bow member, the inverted arch steel bow member that the construction of cooperation later stage inverted arch was erect, can be so that the lower part that is used for the structural steel bow member of preliminary bracing usefulness supports more firmly, prevent that tunnel inner wall both sides are sunken to the centre, combine first bracing piece, an inverted triangle-shaped bearing structure that second bracing piece and third bracing piece formed, make this auxiliary stay device can effectively support the upper portion of structural steel bow member, simultaneously because third bearing structure is in the same place adjacent two liang of first bearing structure fixed connection, make each auxiliary stay device interconnect become a sash structure, the horizontal rigidity and the overall stability of auxiliary stay device have been improved.
Preferably, the second supporting structure further comprises a plurality of transversely arranged fourth supporting rods, and the fourth supporting rods are fixedly connected with the first supporting rods, the second supporting rods and the third supporting rods respectively. Set up like this, the fourth bracing piece can be so that the triangle-shaped structure that falls that first bracing piece, second bracing piece and third bracing piece formed is more stable to improve whole auxiliary stay device's overall stability.
Preferably, the auxiliary supporting device further comprises a plurality of connecting rods fixedly connected between every two adjacent fourth supporting rods, and every two adjacent connecting rods are parallel and equidistant. Set up like this, connect the connecting rod between two liang of adjacent fourth bracing pieces, can increase the level of inverted triangle structure to rigidity, improve the holistic stability of auxiliary stay device.
Preferably, the first supporting structure is an arc-shaped i-shaped steel frame, the opening direction of the first supporting structure is opposite to that of the structural steel arch, and two ends of the i-shaped steel frame are connected to two ends of the structural steel arch through flange bolts. Set up like this, the I-steel frame of arcuation can reduce the shearing force that the structural steel bow member was applyed to it, makes to support more firm, and the crooked both ends of arc are more adapted with the structural steel bow member simultaneously for the I-steel frame can link together through flange bolt and structural steel bow member detachable, makes things convenient for the dismantlement installation of whole I-steel frame, improves tunnel excavation efficiency.
Drawings
FIG. 1 is a schematic view of a part of an axial view of the auxiliary supporting device of the present invention;
FIG. 2 is a longitudinal cross-sectional view of the tunnel during construction of the auxiliary supporting device of the present invention;
FIG. 3 is a flow chart of the auxiliary supporting device of the present invention during construction;
fig. 4 is a detailed flowchart of step S4 in the construction method of the auxiliary supporting device of the present invention.
1. Structural steel arches; 2. a first support structure; 3. a second support structure; 4. a third support structure; 5. a lock pin anchor tube; 6. a step; 7. two steps; 8. three steps; 9. core soil; 10. an inverted arch construction area; 11. a groove; 301. a first support bar; 302. a second support bar; 303. a third support bar; 304. a fourth support bar; 4A, a connecting rod; 1A, an inverted arch steel arch frame.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
In a preferred embodiment of the present invention, referring to fig. 1 and 2, an auxiliary supporting device for tunnel inverted arch construction is provided with a plurality of structural steel arches 1 on the inner wall of a tunnel in advance, and each of the two ends of the structural steel arch 1 is connected to an inverted arch steel arch 1A, the connection may be flange bolt connection, welding or riveting, the preferred embodiment is flange bolt connection, the auxiliary supporting device includes a plurality of first supporting structures 2 respectively connected to the two ends of each structural steel arch 1 and a plurality of second supporting structures 3 respectively connected between the structural steel arches 1 and the first supporting structures 2, the second supporting structures 3 include a first supporting rod 301, a second supporting rod 302 and a third supporting rod 303, one end of the first supporting rod 301 is fixedly connected to the top of the structural steel arch 1, the fixed connection may be welding, flange bolt connection or riveting, the preferred embodiment is welding, one end of the second supporting rod 302 and one end of the third supporting rod are respectively located at the two sides of the first supporting rod 301, the other end of the first supporting rod 301 and the other end of the third supporting rod 303 are connected to the middle of the first supporting rod 301, the second supporting rod 302 and the other end of the second supporting rod 302 is connected to the second supporting rod 301 and the second supporting rod 303, the second supporting rod 302 and the other end of the second supporting rod 302 is connected to the second supporting rod 301 and the third supporting rod 301, the second supporting rod is connected to the second supporting rod 302, the second supporting rod 301 and the third supporting rod, the second supporting rod 2 supporting rod, the second supporting rod is connected to the second supporting rod 302, the number of the second supporting structures 3 is 6, the number of the first supporting structures 2 is 6, and the distance between the first supporting structures 2 is 500mm.
The tunnel inner wall is provided with a plurality of structural steel arches 1 at even intervals along the length direction of the structural steel arches, the structural steel arches 1 are tightly attached to the tunnel inner wall, the axis formed by each structural steel arch coincides with the axis of the tunnel, the lower end of each structural steel arch 1 is connected with an inverted arch steel arch 1A, the connection mode is fixed in a flange bolt connection mode, after the first supporting structure 2 is connected with the structural steel arch 1 of primary support, the inverted arch steel arch 1A erected in later inverted arch construction is matched, the lower portion of the structural steel arch 1 for primary support can be supported more firmly, the first supporting rod 301, the inverted triangle supporting structure formed by the second supporting rod 302 and the third supporting rod 303 is combined, the auxiliary supporting device can effectively support the upper portion of the structural steel arch 1, meanwhile, every two adjacent auxiliary supporting devices are fixedly connected together through the third supporting structure 4, the auxiliary supporting devices are connected into a lattice structure, and the horizontal rigidity and the overall stability of the auxiliary supporting devices are improved.
The utility model discloses a preferred embodiment, second bearing structure 3 still includes a plurality of horizontal fourth bracing pieces 304 that set up, fourth bracing piece 304 respectively with first bracing piece 301, second bracing piece 302 and third bracing piece 303 fixed connection, fourth bracing piece 304 can make the structure of falling the triangle that first bracing piece 301, second bracing piece 302 and third bracing piece 303 formed more stable to improve whole auxiliary stay device's overall stability.
For further optimizing above-mentioned scheme, supplementary bearing structure still includes a plurality of fixed connection at the connecting rod 4A between two adjacent fourth bracing pieces 304, and parallel and the equidistance between two liang of adjacent connecting rods 4A, connects the connecting rod 4A between two adjacent fourth bracing pieces 304, can increase the level of inverted triangle structure to rigidity, improves the holistic stability of supplementary strutting arrangement.
The first supporting rod 301, the second supporting rod 302 and the third supporting rod 303 are made of I20I-shaped steel, the fourth supporting rod 304 and the connecting rods 4A are made of 14 channel steel, the number of the fourth supporting rods 304 is 6, the number of the connecting rods 4A is 5, and each group is 3; the third support structure 4 is made of i-steel.
The utility model discloses an in the preferred embodiment, tip department that is close to each structural steel bow member 1 on the tunnel inner wall all is equipped with at least one lock foot anchor pipe 5, lock foot anchor pipe 5 stretches into the tunnel lateral wall through being 45 jiaos, lock foot anchor pipe 5 can restrict the displacement of structural steel bow member 1 and the soil body, make it undertake earlier the pressure that the country rock warp and arouse, beat of lock foot anchor pipe 5 establish the angle for 45 downwards, lock foot anchor pipe 5 in this embodiment adopts phi 80 mm's seamless steel pipe, the both sides that are close to each structural steel bow member 1's tip department on the tunnel inner wall in this embodiment all are equipped with one lock foot anchor pipe 5, can reach best atress effect like this.
Through the connecting steel plates on the two sides of the lower part of the primary supporting structural steel arch 1, the locking anchor pipe 5 is inserted into the deep part of the surrounding rock after perforation, and the lateral soil body displacement and the vertical sliding of the primary supporting structural steel arch 11 are prevented.
For further optimizing above-mentioned scheme, cement mortar has been poured in lock foot anchor pipe 5, and cement mortar is made for cement and sodium silicate mixture, and the cement mortar after mixing through cement and sodium silicate has rapid hardening and impervious effect, and the ratio of cement and sodium silicate is 1 in this embodiment: 1.
in the preferred embodiment of the present invention, the first supporting structure 2 is an arc-shaped i-steel frame, the opening direction of which is opposite to the opening direction of the structural steel arch 1, and the two ends of the i-steel frame are connected to the two ends of the lower part of the structural steel arch 1 through flange bolts; specifically, the I-steel frame of arcuation can reduce the shearing force that structural steel bow member 1 applyed to it, makes to support more firm, and the both ends of arc bending are more adapted with structural steel bow member 1 simultaneously for the I-steel frame can link together through flange bolt and structural steel bow member 1 detachable, makes things convenient for the dismantlement installation of whole I-steel frame, improves tunnel excavation efficiency, and the I-steel frame is I18I-steel.
Specifically, the second supporting structure 3 preferred in this embodiment is connected to the first supporting structure 2 through the third supporting structure 4, so that the first supporting rod 301, the second supporting rod 302 and the third supporting rod 303 can be conveniently installed, and meanwhile, the side of the i-steel has strong hardness, so that the bending resistance of the i-steel is very strong, the i-steel is not easy to bend, the residual stress of the i-steel is smaller, the accuracy is higher, and the i-steel is uniformly distributed on the first supporting structure 2 at intervals, so that the horizontal rigidity between the first supporting structures 2 can be improved.
Specifically, this auxiliary stay device is a set of bearing structure system of usefulness of consolidating temporarily to tunnel preliminary bracing structure, combines at the vertical three steps 8 excavation methods in tunnel, remains core soil 9 in grades and stabilizes the latter half geology for subside, the rate that convergence tends to be stable, can effectively solve construction safety problem, reach the purpose of quick construction.
The supporting structure system is composed of an arc-shaped I-shaped steel arch frame, a second supporting structure 3 of a vertical inverted triangular structure and a locking anchor pipe 5 which is obliquely inserted into a rock stratum and is in bilateral symmetry with respect to the arch waist, the structural steel arch frame 1 and surrounding rocks of tunnel primary support are formed under the combined action of the three, the supporting system is effectively and temporarily reinforced, a three-step 8 excavation method is combined, the bearing pressure of weak geology at the front end of an inverted arch excavation area of the weak surrounding rock structure is strengthened to prevent the front portion of the tunnel and lateral soil body from sliding, the supporting structure is simple in structure and convenient to operate, the cost is reduced, and meanwhile, the supporting capacity of the weak surrounding rock tunnel primary support can be effectively improved.
Compared with the double-layer steel arch frame reinforcing measure in the prior art, the supporting structure system is simpler to operate and less in construction operation difficulty, so that the construction period is short, and the cost is reduced by more than 30%; for big pipe shed reinforcement measure, the bearing structure system of this application not only has the limiting action to the arch crown sinks, and the level atress is effectual, satisfies the safe construction requirement easily, and the cost reduction is about more than 50%.
In order to shorten the construction period and accelerate the tunnel excavation, liftable support columns are respectively arranged at the lower ends of two sides of each I-shaped steel frame, each auxiliary support device further comprises a moving device arranged at the lower end of each support column, each moving device can enable rollers, guide rails arranged along the length direction of the tunnel are arranged on the ground below each support column, the whole auxiliary support device can be moved by the support columns through the cooperation of the rollers and the guide rails, and the two sides of each support column along the length direction of the tunnel are also provided with a fixing device which can be turned over, when the support columns need to stop moving, the fixing devices are driven to turn over and fall to the ground, so that the rollers leave the ground, the whole auxiliary support device is fixed, the support columns are driven to ascend, the second support structures 3 touch the structural steel arch frames 1, the second support structures 3 are welded on the structural steel arch frames 1, if the auxiliary support devices need to be moved, only the second support structures 3 are cut, the structural steel arch frames 1 are separated from the second support structures 3, the flange bolts at the two sides of the I-shaped steel frames are removed, and the support columns are driven to descend simultaneously.
With reference to fig. 3 and fig. 4, a tunnel construction method using the auxiliary supporting device of the present invention includes the following steps:
s1, excavating a step 6, and primarily spraying concrete after erecting a structural steel arch frame 1 on the inner wall of the tunnel;
s2, constructing a second step 7, reserving core soil 9 on the second step 7, and spraying concrete primary support on the inner wall of the tunnel;
s3, building an auxiliary supporting device on the second step 7;
s4, constructing three steps 8, excavating a soil body in an inverted arch construction area 10 after the construction is finished, and performing inverted arch construction;
and S5, pushing forward a working cycle after the auxiliary supporting device is detached.
In the step S1, a structural steel arch frame 1 is erected on the inner wall of the tunnel and used for supporting the whole tunnel, and concrete is sprayed on the side of the tunnel, so that the effect of closing a soil layer as soon as possible can be achieved; in the step S2, the reserved core soil 9 can be used as a construction platform to stabilize the unearthed tunnel face, and the collapse amount can be reduced if collapse occurs; in the step S3, an auxiliary supporting device is built, so that the structural steel arch 1 at the initial stage can be better supported, and the overall stability of the tunnel is improved; in the step S4, the inverted arch can solve the problem of insufficient basic bearing capacity, prevent uplift deformation of the tunnel ground, seal surrounding rocks, prevent excessive deformation of the surrounding rocks, improve the overall bearing capacity, increase the supporting resistance of bottom and lateral soil bodies and prevent shearing damage caused by inner extrusion; in the step S5, the auxiliary supporting device is dismantled after the construction is finished, the tunnel is pushed to the deep part of the tunnel, and then the processes from the step S1 to the step S4 are repeated until the tunnel construction is finished; the auxiliary supporting device can effectively support the structural steel arch centering 1 of the tunnel primary support, meanwhile, the tunnel surrounding rock can be effectively and temporarily reinforced and supported, and the method for keeping the core soil 9 to stabilize the lower half part of the geology by classification in the steps from S1 to S4 is combined, so that the bearing pressure of the weak geology at the front end of the inverted arch excavation area of the weak surrounding rock structure is enhanced, the slippage of the un-excavated part of the tunnel and the lateral soil body is prevented, the supporting capability of the tunnel primary support of the weak surrounding rock can be effectively improved, the speed of settlement and convergence tending to stability is accelerated, the construction safety problem can be effectively solved, and the purpose of rapid construction is achieved.
In order to further optimize the above scheme, the inverted arch construction area 10 includes a first construction area and a second construction area, so that when the first construction area is subjected to inverted arch construction, the second construction area is subjected to passing of construction vehicles or mechanical equipment; or when the first construction area is used for passing in and out of construction vehicles or mechanical equipment, the second construction area is used for constructing the inverted arch, after one construction area is constructed, the other construction area is excavated, and inverted arch construction is carried out on the lower part of the other construction area, so that the integral closed loop of the primary support steel arch is realized.
In order to further optimize the scheme, a small footage is excavated into the tunnel every 2 meters in a second construction area, the inverted arch steel arch 1A is erected in the second construction area after the excavation is in place, the inverted arch steel arch 1A in the second construction area is connected with the inverted arch steel arch 1A in the first construction area through a flange bolt, reinforcing steel bars are arranged on the inner wall of the tunnel along two sides of the width direction of the inverted arch steel arch 1A, the reinforcing steel bars arranged on two sides of the width direction of the inverted arch steel arch 1A in the second construction area are welded with the reinforcing steel bars arranged on two sides of the width direction of the inverted arch steel arch 1A in the first construction area through electric welding, concrete is poured after the concrete pouring is completed, and the step S5 is carried out; when the inverted arch construction is carried out in first construction district, the business turn over that construction vehicle or mechanical equipment can be carried out in the second construction district is current, and equipment stops to lean on the operation in second construction district in order to support first construction district, can make the inverted arch construction work efficiency of inverted arch construction do not have subregion relatively construct more high-efficiently for the time limit for a project shortens greatly.
The preferred step S4 may be: a41, constructing three steps 8, excavating a second construction area to the inside of the tunnel by a small footage of every 2 meters after the construction is finished, erecting an inverted arch steel arch frame 1A in the second construction area after the excavation is in place, connecting the inverted arch steel arch frame 1A in the second construction area with the inverted arch steel arch frame 1A in the first construction area by using flange bolts, laying reinforcing steel bars on the inner wall of the tunnel along two sides of the width direction of the inverted arch steel arch frame 1A, welding the reinforcing steel bars laid on two sides of the width direction of the inverted arch steel arch frame 1A in the second construction area with the reinforcing steel bars laid on two sides of the width direction of the inverted arch steel arch frame 1A in the first construction area by using electric welding, and pouring concrete after the construction is finished; a42, one section little footage of per 2 meters of first construction area is to the inside excavation of tunnel, and the excavation puts in place the back and founds inverted arch steel bow member 1A in first construction area, and follow on the tunnel inner wall the reinforcing bar is laid to inverted arch steel bow member 1A width direction' S both sides, concreting after the completion, gets into step S5, when the second construction area carries out the inverted arch construction, the business turn over that first construction area can carry out construction vehicle or mechanical equipment is current, and equipment stops at the operation in first construction area in order to support the second construction area, can make the inverted arch construction that the work efficiency of inverted arch construction does not have subregion relatively construct more high-efficiently for the time limit for a project shortens greatly.
Preferably, before the step S4 is executed, the i-steel frame is buried in a lower-mounted manner, a groove is formed in the lower end of the i-steel frame, concrete is poured into the groove, and the lower end of the i-steel frame can improve the supporting firmness through the groove for pouring the concrete, so that the supporting firmness of the whole auxiliary supporting structure is improved.
Specifically, the scheme of the embodiment adopts a three-step construction method and a method of reserving core soil 9 in a two-step 7, firstly, excavation construction is carried out on a first step 6, a steel arch frame is erected, concrete is sprayed for the first time, then construction is carried out on the second step 7, and the core soil 9 is reserved, so that the support of the tunnel face can be completed by relying on the core soil 9 of the two-step 7 because the depth of single tunneling of the tunnel is only 2-4 m, and the construction period can be greatly shortened and the tunneling progress can be accelerated because the core soil 9 is reserved only in the two-step 7 and the core soil 9 is reserved in the three-step. After the construction of the two steps 7 is completed, the auxiliary supporting device needs to be installed at the two steps 7, after the construction is completed, the groove 11 needs to be dug at the lower end of the I-shaped steel frame, the groove 11 is dug to be 25-30 cm below the ground, and a C30 plain concrete cushion layer with the width of 40cm and the thickness of 20cm is poured, even if the whole I-shaped steel frame is buried underground in a lower mode, the supporting strength of the I-shaped steel frame is improved, the supporting strength of the whole auxiliary supporting device is improved, monitoring and measuring need to be strengthened during construction, and the change condition of surrounding rocks needs to be observed in time. Namely, the longitudinal excavation and core soil 9 construction and the construction of the structural steel arch frame 1 for primary support and the auxiliary supporting device for the inverted arch are followed by operation, one section is simultaneously supported when in each excavation section, and the construction of the auxiliary supporting device for the inverted arch is followed immediately.
When the surrounding rock convergence and the tunnel vault subside to meet the construction requirements, the inverted arch construction can be carried out; the inverted arch construction is positioned at the lower half part of the tunnel cave, firstly, the auxiliary supporting device is dismantled outside the lower half part of the tunnel cave, and surrounding rock excavation is carried out; in order to facilitate the passing of construction vehicles and mechanical equipment, the soil body excavation is alternately carried out in a left construction area and a right construction area on the cross section, namely a first construction area and a second construction area. Excavating the lower half part soil body of the first construction area until the position of an inverted arch, excavating by a small feed ruler every 2 meters in the longitudinal direction, and timely erecting an inverted arch steel arch frame 1A, laying steel bars and pouring concrete after the excavation is in place; after the construction of the first construction area is completed, the second construction area is excavated, and the inverted arch construction of the other half lower part is performed, so that the integral closed loop of the structural steel arch frame 1 of the primary support is realized, and then the inverted arch construction of the next cycle is performed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. The utility model provides an auxiliary stay device that tunnel inverted arch construction used sets up a plurality of structural steel bow member (1) and every in advance on the inner wall in tunnel an inverted arch steel bow member (1A) is all connected at the both ends of structural steel bow member (1), a serial communication port, auxiliary stay device includes a plurality of respectively with every first bearing structure (2) and a plurality of that structural steel bow member (1) both ends are connected respectively are connected structural steel bow member (1) with second bearing structure (3) between first bearing structure (2), second bearing structure (3) include first bracing piece (301), second bracing piece (303) and third bracing piece (303), the one end fixed connection of first bracing piece (301) is in the top of structural steel bow member (1), the one end of second bracing piece (302) with the one end of third bracing piece (303) respectively with structural steel bow member (1) is connected and is located the both sides of the one end of first bracing piece (301), the other end of first bracing piece (301) is connected the second bracing piece (302) and the other end of third bracing piece (303) is connected and is connected about the second bracing piece (302) and the second bracing piece (303) is symmetrical support structure (301) and the other end is distributed about two first bracing piece (301) the other ends are connected the auxiliary stay device is connected and the second bracing piece (301) is connected the second bracing piece (302) is connected and the second bracing piece (301) is connected the second bracing piece (302) is still the second bracing piece (302) is connected and the second bracing piece (301) is distributed A third support structure (4) in between.
2. The auxiliary supporting device as claimed in claim 1, wherein the second supporting structure (3) further comprises a plurality of transversely arranged fourth supporting rods (304), and the fourth supporting rods (304) are fixedly connected with the first supporting rod (301), the second supporting rod (302) and the third supporting rod (303), respectively.
3. The auxiliary supporting device as claimed in claim 2, further comprising a plurality of connecting rods (4A) fixedly connected between two adjacent fourth supporting rods (304), and two adjacent connecting rods (4A) are parallel and equidistant.
4. Auxiliary supporting device according to claim 1, characterized in that the first supporting structure (2) is an arc-shaped i-steel frame, the opening direction of which is opposite to the opening direction of the structural steel arch (1), and the two ends of the i-steel frame are connected to the two ends of the structural steel arch (1) through flange bolts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222825517.7U CN218439399U (en) | 2022-10-25 | 2022-10-25 | Auxiliary supporting device for tunnel inverted arch construction |
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| CN202222825517.7U CN218439399U (en) | 2022-10-25 | 2022-10-25 | Auxiliary supporting device for tunnel inverted arch construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115898481A (en) * | 2023-02-23 | 2023-04-04 | 北京市第三建筑工程有限公司 | High-construction-precision non-coaxial stepped rock cavern transition section blasting excavation method |
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2022
- 2022-10-25 CN CN202222825517.7U patent/CN218439399U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115898481A (en) * | 2023-02-23 | 2023-04-04 | 北京市第三建筑工程有限公司 | High-construction-precision non-coaxial stepped rock cavern transition section blasting excavation method |
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