CN114483112A - Arch foot structure, construction method and arch foot system for tunnel primary support - Google Patents
Arch foot structure, construction method and arch foot system for tunnel primary support Download PDFInfo
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- CN114483112A CN114483112A CN202111588773.2A CN202111588773A CN114483112A CN 114483112 A CN114483112 A CN 114483112A CN 202111588773 A CN202111588773 A CN 202111588773A CN 114483112 A CN114483112 A CN 114483112A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides an arch springing structure for primary tunnel support, which comprises: a plurality of steel frames, cross-shaped inclined struts and steel groove supporting legs; the steel frames are arranged at intervals along the axial direction of the tunnel, and at least two adjacent steel frames are arranged according to a preset height difference; the multi-steel frame at least comprises: the lower end of the first steel frame is mounted to a preset excavation height; the lower end of the second steel frame is installed below the preset excavation height, namely, the second steel frame is embedded into the rock-soil body, and the lower end of the second steel frame and the lower end of the first steel frame form a height difference. The steel frame embedded in the rock-soil body can play a role of supporting and blocking similar to a cantilever retaining wall, the deformation pressure of lateral surrounding rocks is resisted, the integrity of the steel frame at the position of the preliminary bracing arch springing is further improved through the cross-shaped inclined strut, and the local extrusion stress of the surrounding rocks to the preliminary bracing is diffused. In addition, the steel groove supporting legs can play a role in fixing the steel frame and inhibiting the change of the curvature of the tail end of the steel frame, and can be repeatedly used. The method can be applied to the technical field of primary support design and construction of tunnel engineering.
Description
Technical Field
The invention belongs to the technical field of design and construction of primary supports of tunnel engineering, and particularly relates to an arch springing structure, a construction method and an arch springing system of the primary supports of tunnels.
Background
In the construction process of underground engineering such as tunnels and the like, the step method is a common construction method, and because the tunnel section is divided into a plurality of small sections, the risks of tunnel face collapse and top surrounding rock collapse in a cycle operation are reduced, and a plurality of working faces can be provided for cooperative operation, so that the mechanical transition is facilitated and the construction progress is accelerated, but the defects are that a plurality of disturbances are generated on the surrounding rock, the deformation of the arch foot steel frame unit connecting point at the step is maximized, and the arch foot steel frame unit connecting point becomes a weak point of the whole primary support, in the related design, construction specification and conventional construction method of the primary support of the tunnel, the arch foot steel frame units are all of equal length design, and the arch foot steel frame connecting point is usually at the same height position and is generally flush with the excavation height of the step, namely the weak point is on a horizontal line, which can be often seen in the tunnel engineering of some weak surrounding rock strata, the steel frame connecting points at the middle step arch springing are extruded in a row. The influence of this is that, on the one hand, the curvature of the end of the steel frame unit changes, so that the lower steel frames cannot be smoothly connected according to the original designed curvature. On the other hand, the steel frame connecting part is partially protruded and deformed, which is not beneficial to uniformly laying the lining waterproof board and the lining reinforcing steel bars, especially when the extrusion deformation is serious, the steel frame can invade the secondary lining construction limit, the engineering is forced to rework and replace, the material is wasted, and the construction period is delayed.
That is, for tunnel engineering, when the preliminary bracing arch foot steelframe is executed in the step method construction, the steelframe unit tie point is at same level, after receiving external disturbance factor, the arch foot steelframe end is extruded the deformation by the antithetical couplet row easily, and then leads to steelframe unit end curvature change, is superior to the local deformation of steelframe even, and secondary lining invades the limit, and final rework is torn open and is changed, causes the material waste.
It can be seen that for the design of the arch springing part of the primary support in the tunnel engineering, how to avoid that the weak stress points of the primary support are at the same horizontal height so as to improve the overall extrusion deformation resistance of the primary support steel frame is a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention provides a tunnel primary support arch springing structure, which at least solves the technical problems.
In order to solve the above problems, a first aspect of the present invention provides a back-up arch springing structure for preliminary tunnel supporting, the back-up arch springing structure including: the steel frames are arranged at intervals along the axial direction of the tunnel, and at least two adjacent steel frames are installed according to a preset height difference; the multi-steel frame at least comprises: the lower end of the first steel frame is mounted to a preset excavation height; the lower end of the second steel frame is installed below a preset excavation height, the lower end of the second steel frame is embedded into a rock-soil body, the first steel frame and the second steel frame are the same in length, and the lower end of the second steel frame and the lower end of the first steel frame form the height difference.
In the first aspect, the predetermined height difference is 30-80 cm.
In a first aspect, the arch springing structure further comprises: and the longitudinal connecting structure is connected between the first steel frame and the second steel frame.
In a first aspect, the longitudinal connecting structure comprises a plurality of longitudinal connecting plates and a plurality of braces;
one or more longitudinal connecting plates and one or more inclined struts are correspondingly connected between each first steel frame and each second steel frame; wherein the content of the first and second substances,
and if the number of the inclined struts is two, the inclined struts are arranged in a crossed manner.
In a first aspect, the arch springing structure further comprises steel channel supporting legs, the steel channel supporting legs comprising: the device comprises a supporting plate, a supporting plate and a lifting device, wherein four supporting legs are arranged on one surface of the supporting plate and are used for being embedded into loosened rock mass on an excavation surface layer and fixing the position of the supporting plate; the another side of backup pad is provided with the mounting groove, be used for installing in the mounting groove the steelframe, the mounting groove size corresponds with steelframe tip size.
In a second aspect, the invention provides a construction method for a tunnel preliminary bracing arch springing steel frame, wherein the arch springing is composed of a plurality of steel frames, and the construction method comprises the following steps: after the tunnel arch springing position is excavated, arranging one or more first steel frames at the excavation position, and enabling the lower ends of the first steel frames to be installed to a preset excavation height; correspondingly arranging one or more second steel frames according to the position of the first steel frame, correspondingly installing the lower ends of the one or more second steel frames below a preset excavation height, and embedding rock and soil bodies; wherein the length of each first steel frame is the same as that of each second steel frame;
in a second aspect, the preset height difference between the first and second steel frames is set to 30-80 cm.
In a second aspect, the construction method further includes: longitudinal connecting ribs and inclined struts are arranged between the first steel frame and the second steel frame, the inclined struts are made of steel plates and welded between adjacent steel frames, and two ends of each inclined strut are respectively and correspondingly connected to the height difference positions of the first steel frame and the second steel frame;
in a second aspect, when the first steel frame and the second steel frame are installed, steel groove supporting legs are laid at the lower ends of the first steel frame and the second steel frame, and the lower ends of the first steel frame and the second steel frame are correspondingly placed in the installation grooves, so that the lower ends of the first steel frame and the second steel frame can be conveniently fixed.
In a third aspect, the invention provides a tunnel preliminary bracing arch springing system, which comprises any one of the tunnel preliminary bracing arch springing structures described above.
Has the advantages that: the invention provides an arch foot structure for preliminary tunnel support, which is characterized in that the arch foot structure consists of a plurality of steel frames and is arranged along the axial direction of a tunnel, and at least two adjacent steel frames are designed according to a preset height difference to form a structure of reserved stubbles. The integrity of the steel frame structure at the arch springing position of the primary support is improved through the crossed inclined struts, and the diffusion of the local extrusion stress of surrounding rocks on the primary support is facilitated. The steel groove supporting legs can play a role in fixing the steel frame and inhibiting the change of the curvature of the tail end of the steel frame, and can be repeatedly used. The invention has simple design and construction, saves the construction cost and greatly improves the construction efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first structural view of an arch springing structure of a primary tunnel support according to a first embodiment of the present invention;
fig. 2 is a structural diagram ii of an arch springing structure of a tunnel preliminary bracing in the first embodiment of the present invention;
fig. 3 is a structural diagram three of an arch springing structure of a tunnel preliminary bracing in the first embodiment of the invention;
FIG. 4 is a diagram illustrating a connection structure between a steel channel supporting structure and a single steel frame according to an embodiment of the present invention;
FIG. 5 is a structural diagram of a steel tank supporting structure according to a first embodiment of the present invention;
description of reference numerals:
1. a longitudinal connecting plate;
2. a first steel frame;
3. a steel frame unit connecting plate;
4. bracing;
5. a second steel frame;
6. a steel trough support structure;
601. a support plate;
602. mounting grooves;
603. support the feet.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Meanwhile, in the embodiments of the present description, when an element is referred to as being "fixed to" another element, it may be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical", "horizontal", "left", "right" and the like used in the embodiments of the present specification are for illustrative purposes only and are not intended to limit the present invention.
Based on the technical problems in the background art, the invention needs to optimally design the spatial arrangement type, the longitudinal connection structure and the installation method of the steel frame at the arch springing part in the primary tunnel support based on the technical problems. The prior art is generally based on the concept of reinforcement, for example, measures such as setting a foot-locking anchor rod/pipe, reinforcing a steel frame longitudinal connection, adding a concrete cushion block to an arch foot, and the like are already common methods for dealing with extrusion deformation of an arch foot steel frame, but the following defects still exist in the design and construction of the reinforcing measures: 1. when a conventional foot-locking anchor rod/pipe is arranged in a weak and broken surrounding rock stratum, the hole is difficult to form, and the self-advancing anchor rod/pipe is high in manufacturing cost; 2. the self-advancing anchor rod/pipe drilling process of the large pipe diameter consumes long time, and the self-advancing anchor rod/pipe drilling process can only be implemented at the middle step and the lower step and cannot be implemented at the arch springing of the upper step due to the requirement of the working surface of the locking foot anchor rod/pipe drilling machine of the large pipe diameter. 3. The size selection and the drilling angle selection of the foot locking anchor rod/pipe still have great experience and blindness. 4. The longitudinal connecting ribs mainly improve the longitudinal integrity of the steel frame, and the deformation control of the steel frame extruded laterally is limited. 5. The added round wood or steel frame diagonal bracing in the tunnel is a temporary auxiliary measure, occupies the construction space in the tunnel, and can be gradually removed along with the propulsion of subsequent construction, thereby generating waste to a certain extent. Next, the present specification will propose a solution to the above technical problem from an embodiment:
the first embodiment is as follows:
as shown in fig. 1 to 5, the first embodiment provides a preliminary tunnel supporting arch springing structure, which includes: the tunnel comprises a plurality of steel frames, a plurality of steel frames and a plurality of steel-frame-shaped supporting frames, wherein the plurality of steel frames are arranged at intervals along the axial direction of the tunnel, and at least two adjacent steel frames are arranged according to a preset height difference; the multi-steel frame at least comprises: the lower end of the first steel frame 2 is installed to a preset excavation height; and the lower end of the second steel frame 5 is installed below the preset excavation height, namely, the second steel frame 5 is embedded into a rock-soil body, and the lower end of the second steel frame 5 and the lower end of the first steel frame 2 form a height difference.
In the technical scheme of the first embodiment, the arch foot structure is composed of a plurality of steel frames and is arranged along the axial direction of the tunnel, and at least two adjacent steel frames are designed according to a preset height difference to form a stubble-remaining structure, the structural design mode solves the technical problem that in the prior art, the connecting points of the steel frame units of the plurality of steel frames forming the arch foot structure are arranged at the same height, and the lower ends of the steel frames are not laterally limited and supported, so that the lateral deformation resistance of the primary support at the arch foot position is poor, and in terms of mechanics, in the stubble-remaining design of the invention, the first steel frame 2 and the second steel frame 5 forming the arch foot structure are arranged according to the preset height difference, and the part of the second steel frame 5 capable of being embedded into rock-soil body can play a role of supporting and blocking similar to a cantilever retaining wall, so as to resist the lateral surrounding rock deformation pressure. The integrity of the steel frame structure at the arch springing position of the primary support is improved through the crossed inclined strut, and the diffusion of the local extrusion stress of surrounding rocks on the primary support is facilitated. The steel groove supporting legs can play a role in fixing the steel frame and inhibiting the change of the curvature of the tail end of the steel frame, and can be repeatedly used. The invention has simple design and construction, saves the construction cost and greatly improves the construction efficiency.
Specifically, for the preset height difference, the first embodiment proposes an implementation manner, which includes: the preset height difference is 30-80 cm.
Further, with respect to the arch springing structure of the first embodiment, the present embodiment also proposes an implementation mode, which includes: a cross-type diagonal brace 4; the crossed inclined strut 4 can be made of steel plates and is welded between the adjacent steel frames, and two ends of the inclined strut correspond to the height difference positions of the first steel frame and the second steel frame respectively. So as to ensure the connection stability between the first steel frame 2 and the second steel frame 5 and the integrity of the supporting structure.
Specifically, for the arch springing structure, the first embodiment further proposes an implementation mode, where the implementation mode includes that the arch springing structure further includes a steel channel support structure 6, and the steel channel support structure 6 includes: the supporting plate 601, four supporting legs 603 are arranged at four corners of one surface of the supporting plate 601, and the supporting plate is supported on the ground; the other side of the supporting plate 601 is provided with a mounting groove 602, and the lower ends of the first steel frame and the second steel frame 5 unit are arranged in the mounting groove 602.
Further, as for the number of the installation grooves 602 arranged on the support plate 601, it can be determined according to the number of steel frames constructed in a single excavation supporting cycle footage, that is, the size of the support plate 601 and the number of the installation grooves 602 arranged on the support plate 601 can be correspondingly set according to the number of the first steel frames 2 or the second steel frames 5, so that the plurality of installation grooves 602 arranged on the same support plate 601 can fix the lower ends of a plurality of first steel frames 2 or second steel frames 5, thereby further improving the lateral stability of the lower ends of the units of the first steel frames 2 or the second steel frames 5.
It should be noted that the application scenario of the first embodiment is preferably applied to a tunnel constructed by a step method, and the step method is exemplified by using one excavation supporting circulating footage of a constructed tunnel to construct one steel frame and using one excavation supporting circulating footage to construct multiple steel frames.
Circularly advancing and constructing a steel frame by excavation and support:
after one circulation footage excavation at the arch foot part is finished, when steel frames are erected, steel frame units with the same curvature as that of the previous steel frame but 30-80cm more in length are installed.
And the part which is longer than the unit length of the previous steel frame is embedded into soil or rock, and the height of the tail end of the steel frame unit is 30-80cm lower than that of the tail end of the previous steel frame unit.
The design of 30 ~ 80cm scope of crisscross from top to bottom in steelframe unit tie point, on the one hand consider that the ground body that steelframe unit lower extreme buryed the step position too shallowly can not play effectual cantilever retaining effect, buryed too deeply then be not convenient for construct.
After the steel frames are constructed, the next construction cycle is performed, and when the steel frames are erected, steel frame units with the same length and curvature as those of the previous steel frame are installed.
In the subsequent construction progress, the design of the steel frame of the arch springing position and the construction are analogized, and finally, the connection points of the adjacent steel frame units of the arch springing position are not kept at the same height but are arranged in a vertically staggered manner along the axial direction of the tunnel.
The preliminary bracing at the arch springing part can still be normally implemented according to the design of the tunnel, the construction specification and the design drawing of the tunnel by other conventional measures such as steel bar meshes, sprayed concrete and the like except for steel frames.
For the primary tunnel support of two-step construction, the arch springing position corresponds to the upper step and the lower step. For the primary tunnel support constructed by the step method, the arch springing parts correspond to the upper, middle and lower steps.
Circularly advancing and constructing a plurality of steel frames by excavation and support:
the multi-steel frame units simultaneously operated in one cycle can keep the same curvature and length, the multi-steel frame units simultaneously operated in the next cycle are uniformly lengthened by 30-80cm, and the steel frame unit connecting points between adjacent cycles are arranged in a vertically staggered mode.
In the subsequent construction progress, the design of the steel frame units at the arch foot positions and the construction are analogized, and finally, the adjacent circulating steel frame unit connecting points at the arch foot positions are not kept at the same height along the axis direction of the tunnel but are arranged in a vertically staggered manner.
The preliminary bracing at the arch springing part can still be normally implemented according to the design of the tunnel, the construction specification and the design drawing of the tunnel by other conventional measures such as steel bar meshes, sprayed concrete and the like except for steel frames.
For the primary tunnel support of two-step construction, the arch springing position corresponds to the upper step and the lower step. For the primary tunnel support constructed by the three-step method, the arch springing parts correspond to the upper step, the middle step and the lower step.
Further, in the first embodiment, when the primary support is designed in two or more layers, the primary support of the first layer can still be designed and constructed by referring to the description of the patent.
Example two:
the second embodiment provides a construction method for a tunnel preliminary bracing arch foot steel frame, wherein the arch foot is composed of a plurality of steel frames, and the construction method comprises the following steps: after the tunnel arch springing position is excavated, arranging one or more first steel frames at the excavation position, and enabling the lower ends of the first steel frames to be installed to a preset excavation height; correspondingly arranging one or more second steel frames according to the position of the first steel frame, correspondingly installing the lower ends of the one or more second steel frames below a preset excavation height, and embedding rock and soil bodies; and the length of each first steel frame is the same as that of each second steel frame.
Further, regarding the preset height difference between the first steel frame and the second steel frame, the second embodiment provides an implementation manner, which includes: and setting the preset height difference between the first steel frame and the second steel frame to be 30-80 cm.
Specifically, regarding the connection manner between the first steel frame and the second steel frame, the second embodiment proposes an implementation manner, which includes: first steelframe with between the second steelframe, set up longitudinal connection muscle and bracing, the bracing adopts the steel sheet, weld between adjacent steelframe, the bracing both ends are corresponding to first steelframe and second steelframe difference in height position respectively, and the bracing forms the bearing structure who maintains a steelframe and second steelframe with the longitudinal connection muscle jointly, can make being connected between first steelframe and the second steelframe more stable, perhaps can understand, through the connected mode that combines together bracing and longitudinal connection muscle, make the antitorque effect of steelframe better.
Further, in order to ensure the installation stability of the first steel frame or the second steel frame, the second embodiment provides an implementation manner, which includes: when the steelframe is installed, lay the steel bay supporting legs at the steelframe lower extreme, the steelframe is placed in the steel bay, is convenient for fix steelframe tip to prevent that the bottom of first steelframe or second steelframe is direct to contact with tunnel face or the inside ground structure in tunnel, take place deformation, and then influence the smooth and smooth connection of lower part steelframe unit.
Example three:
the third embodiment of the invention provides an arch foot system for tunnel primary support, which comprises any one of the arch foot structures for tunnel primary support, wherein a stubble structure is formed by designing at least two adjacent steel frames in the arch foot structure according to a preset height difference, so that the construction problem that the thin and weak points of a plurality of steel frames forming the arch foot structure are arranged at the same height in the prior art, and the steel frame connection points are easily extruded by surrounding rock united rows is solved. From the mechanical perspective, in the 'stubble remaining' design, the first steel frame and the second steel frame which form the arch foot structure are arranged according to the height difference, the second steel frame embedded into the rock mass part can play a role of supporting and blocking similar to a cantilever retaining wall to resist lateral surrounding rock deformation pressure, and meanwhile, when the disturbance stress is extruded and transmitted along the tunnel direction, the disturbance stress can be further dispersed, so that the stability of the arch foot structure is improved, arch foot supporting consumables are saved, the engineering cost is saved, the construction is simple and convenient, and the operation efficiency is improved.
Since the second embodiment and the first embodiment are the same in the same inventive concept, and the structure of the second embodiment is completely the same as that of the first embodiment, the structure of the second embodiment that is substantially the same as that of the first embodiment is not described in detail, and the detailed description is not referred to the first embodiment.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; and the modifications, changes or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A tunnel preliminary bracing arch springing structure, characterized in that, the arch springing structure includes:
the steel frames are arranged at intervals along the axial direction of the tunnel, and at least two adjacent steel frames are installed according to a preset height difference; the multi-steel frame at least comprises:
the lower end of the first steel frame is mounted to a preset excavation height;
the lower end of the second steel frame is installed below a preset excavation height, the lower end of the second steel frame is embedded into a rock-soil body, the first steel frame and the second steel frame are the same in length, and the lower end of the second steel frame and the lower end of the first steel frame form the height difference.
2. The tunnel preliminary bracing arch springing structure of claim 1, wherein:
the preset height difference is 30-80 cm.
3. The tunnel preliminary bracing arch springing structure of claim 1, wherein the arch springing structure further comprises:
and the longitudinal connecting structure is connected between the first steel frame and the second steel frame.
4. The preliminary tunnel supporting arch springing structure of claim 3,
the longitudinal connecting structure comprises a plurality of longitudinal connecting plates and a plurality of inclined struts;
one or more longitudinal connecting plates and one or more inclined struts are correspondingly connected between each first steel frame and each second steel frame; wherein, the first and the second end of the pipe are connected with each other,
and if the number of the inclined struts is two, the inclined struts are arranged in a crossed manner.
5. The tunnel primary support arch springing structure of claim 1, further comprising steel channel support feet, said steel channel support feet comprising:
the device comprises a supporting plate, a supporting plate and a lifting device, wherein four supporting legs are arranged on one surface of the supporting plate and are used for being embedded into loosened rock mass on an excavation surface layer and fixing the position of the supporting plate; the another side of backup pad is provided with the mounting groove, be used for installing in the mounting groove the steelframe, the mounting groove size corresponds with steelframe tip size.
6. A construction method of a tunnel primary support arch springing steel frame as set forth in claims 1 to 5, wherein the arch springing is composed of a plurality of steel frames, the construction method comprising:
after the tunnel arch springing position is excavated, arranging one or more first steel frames at the excavation position, and enabling the lower ends of the first steel frames to be installed to a preset excavation height;
correspondingly arranging one or more second steel frames according to the position of the first steel frame, and correspondingly installing the lower ends of the one or more second steel frames below a preset excavation height, namely embedding rock and soil bodies; and the length of each first steel frame is the same as that of each second steel frame.
7. The arch springing construction method of preliminary tunnel support according to claim 6, wherein:
and setting the preset height difference between the first steel frame and the second steel frame to be 30-80 cm.
8. The construction method of an arch springing for preliminary tunnel support according to claim 7, wherein the construction method further comprises:
the first steelframe with between the second steelframe, set up longitudinal tie plate and bracing, the bracing adopts the steel sheet, welds between adjacent steelframe, and the bracing both ends correspond to first steelframe and second steelframe difference in height position respectively.
9. The construction method of an arch springing for preliminary tunnel support according to claim 7, wherein the construction method further comprises:
when the first steel frame and the second steel frame are installed, steel groove supporting legs are laid at the lower ends of the first steel frame and the second steel frame, the lower ends of the first steel frame and the second steel frame are correspondingly placed in the mounting grooves, and the end portions of the first steel frame and the second steel frame are convenient to fix.
10. The utility model provides a tunnel preliminary bracing's hunch foot system which characterized in that:
the soffit system comprising the tunnel preliminary bracing soffit structure of any of the preceding claims 1-6.
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