CN115095357A - Built-in pipe shed supporting device and direct construction method of pipe shed in tunnel - Google Patents
Built-in pipe shed supporting device and direct construction method of pipe shed in tunnel Download PDFInfo
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- CN115095357A CN115095357A CN202210861042.9A CN202210861042A CN115095357A CN 115095357 A CN115095357 A CN 115095357A CN 202210861042 A CN202210861042 A CN 202210861042A CN 115095357 A CN115095357 A CN 115095357A
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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
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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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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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
Abstract
The invention discloses a built-in pipe shed supporting device and a direct construction method of a pipe shed in a tunnel, wherein the last erected steel arch frame near a tunnel face is used as a simple positioning frame, the pipe shed in the tunnel is arranged on surrounding rock in front of the tunnel face, and a reversely-lengthened built-in pipe shed bracket structure is arranged at the tail end of the pipe shed after grouting of the pipe shed is completed, so that the bearing capacity of the pipe shed in the tunnel for resisting vertical load of the surrounding rock of an arch part in an excavation suspension stage can be obviously improved, the problem of integral failure of the pipe shed in the tunnel caused by settlement and deformation of the tail end of the pipe shed is effectively prevented, and the whole construction process is simple and has strong operability; and the construction of the pipe shed in the tunnel completely follows the tunnel face, no special auxiliary operation space is needed, the structural flexibility is extremely high, the sudden construction conditions such as collapse, roof fall or sudden disclosure of a soft broken zone on the tunnel face can be effectively met, the application range is wide, and the practicability is high.
Description
Technical Field
The invention relates to a built-in pipe shed supporting device and a direct construction method of a pipe shed in a tunnel, and belongs to the technical field of tunnel construction.
Background
In the tunnel construction process, the surrounding rock zone can be broken softly, or accidents such as tunnel face collapse and roof fall occur, at the moment, the support length of the advanced small conduit or the advanced anchor rod is not enough to effectively penetrate through a potential fracture angle, and the stability of the surrounding rock of the arch part in the excavation suspension stage can not be ensured. In order to ensure the construction safety, a forepoling shed is generally selected as a forepoling measure for penetrating through the unfavorable geological zone in the engineering. The conventional construction of the pipe shed in the tunnel needs to be provided with a pipe shed working chamber, and the construction of the pipe shed working chamber relates to the expanding excavation of a primary supporting structure of the tunnel, and a certain structural space is needed. Considering that the tunnel face surface reveals weak broken surrounding rocks, the face surface collapses or roof fall accidents have larger outburst, at the moment, if the primary support structure is dismantled towards the rear of the face surface to construct the pipe shed working chamber, scrapping engineering can be generated, and the pipe shed working chamber is expanded and excavated towards the front weak broken zone or the collapse body of the face surface, great construction risks exist, so that the construction conditions of the pipe shed working chamber are basically not provided under the outburst condition in actual construction. Meanwhile, the construction of the pipe shed working chamber has certain disadvantages in the aspects of construction cost, construction period, construction risk and the like, and the construction of the pipe shed in the tunnel is assisted by the pipe shed working chamber in the actual tunnel construction process.
At present, for the construction of the pipe shed in the tunnel, some researches are conducted on how to simplify or cancel a pipe shed working room, but most research measures do not take detailed consideration of the problem of construction space interference of a tunnel face or the stress characteristic of the pipe shed in the tunnel during construction, so that the related technical requirements of tunnel construction on the pipe shed in the tunnel are difficult to meet really. In view of the above situation, it is of great practical significance to research a built-in pipe shed supporting device and a method for directly constructing a pipe shed in a tunnel.
Disclosure of Invention
In view of this, the present invention provides a built-in pipe shed supporting device and a method for directly constructing a pipe shed in a tunnel, which can overcome the defects of the prior art.
The purpose of the invention is realized by the following technical scheme:
a built-in pipe shed supporting device comprises a simple positioning frame, wherein the simple positioning frame is a steel arch frame erected at the last frame near a tunnel face; the simple positioning frame is provided with a plurality of pipe shed positioning holes, the pipe shed positioning holes are internally provided with in-tunnel pipe sheds, the in-tunnel pipe sheds are integrally inclined upwards and deeply penetrate into surrounding rocks in front of the tunnel face, and the tail ends of the in-tunnel pipe sheds are provided with built-in pipe shed bracket structures which are reversely lengthened.
The built-in pipe shed bracket structure comprises a rotatable pipe connecting device, and an arc-shaped steel support is arranged at the bottom of the rotatable pipe connecting device.
The rotatable pipe connecting device comprises a base, wherein a wedge-shaped cutting groove is formed in the base, the inclined wedge-shaped cutting groove is formed in the base, a mounting groove is formed in one side, close to the inclined lower side of the wedge-shaped cutting groove, an elastic connecting piece is arranged on the other side of the base, a long connecting sleeve assembly is arranged in the wedge-shaped cutting groove, one end of the long connecting sleeve assembly is hinged to a hinge shaft arranged in the mounting groove, the other end of the long connecting sleeve assembly is connected with the elastic connecting piece, and the long connecting sleeve assembly is attached to the wedge-shaped cutting groove under the restoring force action of the elastic connecting piece.
The arc-shaped steel support is a spliced temporary arch protection structure arranged along the outline of the tunnel, the spliced temporary arch protection structure is formed by splicing I20a I-shaped steel, and the lower part of the I-shaped steel is fixedly connected with the existing primary support of the tunnel into a whole through a sprayed concrete connecting structure.
A method for directly constructing a tunnel inner shed comprises the following steps:
s1, according to the instability condition of the tunnel face, carrying out back-pressure backfill on the face by using the tunnel slag or the permeable stone material to form a construction platform;
s2, taking the last erected steel arch frame near the tunnel face as a simple positioning frame, and processing a plurality of pipe shed positioning holes at the web position of the simple positioning frame along the contour of the tunnel arch part;
s3, obliquely and upwards driving the pipe shed into the tunnel from the pipe shed positioning hole along the surrounding rock direction in front of the tunnel face;
s4, after the hole inner pipe shed is built, high-pressure grouting construction of the hole inner pipe shed is conducted by grouting equipment;
s5, conducting reverse lengthening on the pipe shed along the rear part of the tunnel face at the tail end of the pipe shed in the tunnel to form a reliably stressed built-in pipe shed bracket structure;
s6, carrying out tunnel face tunneling and supporting construction in sequence under the protection of the pipe shed in the tunnel;
s7: after a collapse body or a soft broken zone at the tail end of the pipe shed is effectively penetrated through the excavated tunnel face, and at least 2-3 pieces of primary I-shaped steel are arranged below the bottom of the pipe shed in the tunnel, the built-in pipe shed bracket structure is dismantled;
and S8, after all the built-in pipe shed bracket structures are removed, constructing the primary support of the area and spraying concrete, so that the pipe shed in the tunnel is completely covered in the primary support.
In the step S1, if the surrounding rock of the tunnel face is rapidly deteriorated but the tunnel face collapse accident has not been developed, the tunnel face is only required to be back-pressure backfilled with the hole slag or the permeable stone material to form a construction platform;
if the face is subjected to scale collapse or roof fall, firstly, carrying out back-pressure backfilling on the face by using hole slag or permeable stone to form a construction platform; then carrying out concrete spraying reinforcement or grouting reinforcement on the collapse body so as to ensure that the collapse body is relatively stable;
the construction can not block the underground water drainage channel, and inclined drainage holes are arranged to drain the underground water when necessary.
In step S2, the last erected steel arch near the tunnel face is used as a simple positioning frame, and a simple process is performed:
1) a phi 60 or phi 76 locking anchor pipe is additionally arranged on the arch springing of the steel arch frame, and the length is controlled to be 4.5-6.0 m;
2) the cutting work of pipe canopy locating hole is carried out at simple and easy locating rack web position to adopt the electric welding cutting mode, and the position and the quantity of pipe canopy locating hole are confirmed according to the construction scheme, and pipe canopy locating hole setting range is tunnel hunch portion 120 scope, and it is 27 ~ 35 to set up the quantity to adjacent pipe canopy locating hole is equidistance or not equidistance setting.
In the step S3, drilling construction of the portal pipe shed is performed by using a down-the-hole drill or other drilling equipment with the help of the pipe shed positioning hole on the simple positioning frame, and a pipe-following drill process is adopted for a section with serious hole collapse of the surrounding rock; the tunnel inner pipe shed adopts phi 89 or phi 108 grouting steel pipes, the length of each steel pipe is preferably controlled within the range of 8-15 m, and the construction angle of the pipe shed is controlled within the range of 5-10 degrees.
In the step S4, after the tunnel inner tube shed is constructed, high-pressure grouting construction is performed by using grouting equipment, after the grouting, the steel tubes are filled with M20 cement mortar, and a reinforcement cage made of 4 phi 20 steel bars is additionally arranged in the tube shed, so as to improve the rigidity of the tube body of the tube shed.
In the step S5, the concrete construction steps of the pipe shed bracket structure are as follows:
a. sheathing the tail end of the pipe shed in the tunnel with a hollow extension sleeve of a rotatable pipe connecting device, and tightly jacking and clamping the pipe shed in the tunnel through a limiting mechanism to realize the fixed connection of the hollow extension sleeve and the pipe shed in the tunnel; at the moment, the base is lifted by the elastic connecting rope through the hollow extension sleeve positioned with the tunnel inner shed, so that the base is prevented from rotating and swinging up and down in a suspended stage below the base;
b. the inner pipe shed of each hole corresponds to one set of rotatable pipe connecting devices, after all the rotatable pipe connecting devices are installed, arc-shaped steel supports are erected at the front end and the rear end of the base of each rotatable pipe connecting device respectively to support the rotatable pipe connecting devices, and the arc-shaped steel supports and the existing primary supports of the tunnel are fixedly connected into a whole through a sprayed concrete connecting structure; thus, the installation and construction of the pipe shed bracket structure arranged at the tail end of the pipe shed in the tunnel are completed.
In step S6, tunnel face excavation and support construction are performed under the protection of the tunnel inner wall, and erection construction and preliminary support shotcrete construction of the primary support steel frame under the tunnel inner wall bottom are performed in a manner of "excavation one roof truss and support one roof truss".
Compared with the prior art, the built-in pipe shed supporting device and the direct construction method of the in-tunnel pipe shed disclosed by the invention utilize the last erected steel arch frame near the tunnel face as a simple positioning frame, the in-tunnel pipe shed is arranged on the surrounding rock in front of the tunnel face, and the built-in pipe shed bracket structure which is reversely lengthened is arranged at the tail end of the pipe shed after grouting of the pipe shed is finished, so that the bearing capacity of the in-tunnel pipe shed in resisting the vertical load of the surrounding rock at the arch part in the excavation suspension stage can be obviously improved, the problem of integral failure of the in-tunnel pipe shed caused by settlement and deformation of the tail end of the pipe shed is effectively prevented, and the built-in pipe shed supporting device is suitable for the technical field of tunnel advanced supporting construction.
The invention has the beneficial effects that:
(1) according to the invention, the last erected steel arch frame near the tunnel face is directly used as a simple positioning frame, an in-tunnel pipe shed is drilled in surrounding rock in front of the tunnel face, and then the in-tunnel pipe shed is reversely lengthened through a rotatable pipe connecting device, so that a built-in pipe shed bracket mechanism with reliable stress is constructed at the lengthened part, the whole construction process is simple, and the operability is strong; the construction of the pipe shed in the tunnel is completely followed by the tunnel face, no special auxiliary operation space is needed, the structural flexibility is extremely high, the sudden construction conditions such as collapse, roof fall or sudden exposure of a soft broken zone on the tunnel face can be effectively met, the application range is wide, and the practicability is high;
(2) compared with the conventional pipe shed working room, the built-in pipe shed bracket structure does not need to dismantle a constructed primary support structure and forcibly expand and dig the tunnel face against the risk, can effectively avoid the adverse effects of expansion and excavation construction of the pipe shed working room on construction cost, construction period, construction risk and the like, and has better economic benefit and engineering benefit;
(3) the rotatable pipe connection device is matched with the arc-shaped steel support, so that a built-in pipe shed bracket structure which is tightly attached to the surface of a primary support is formed, compared with the existing in-tunnel pipe shed which is directly constructed, the built-in pipe shed bracket structure can effectively support the tail end of a pipe shed, the bearing capacity of the in-tunnel pipe shed for resisting the vertical load of surrounding rocks of an arch part is ensured, and the built-in pipe shed bracket structure is closely attached to the primary support as a whole, so that the occupied space of the structure is small, the construction of other procedures in a tunnel is not basically influenced, the structure function is reliable, and the construction interference is extremely small;
(4) the rotatable pipe connecting device can meet the lengthening condition of pipe sheds in tunnels with different elevation angles through a mechanical angle adjusting structure, fully considers the condition of relatively severe construction environment of tunnel face positions through the structural design, and is simple and durable in mechanical structure, not easy to damage and high in repeatable utilization rate.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic longitudinal structure of the present invention.
Fig. 2 is a first schematic structural diagram of a rotatable adapter device.
Fig. 3 is a schematic structural diagram of a rotatable adapter device.
Fig. 4 is a connection structure diagram of the hollow extension sleeve, the limiting mechanism and the pipe shed in the tunnel.
FIG. 5 is a first construction flow chart of the present invention.
FIG. 6 is a second construction flow chart of the present invention.
Fig. 7 is a third construction flow chart of the present invention.
FIG. 8 is a fourth construction flow chart of the present invention.
Fig. 9 is a fifth construction flow chart of the present invention.
Fig. 10 is a schematic view of the positioning frame.
FIG. 11 is a schematic view of the installation of the rotatable nozzle device and the arc-shaped steel support.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
As shown in fig. 1-11, a built-in pipe shed supporting device comprises a simple positioning frame 1, wherein the simple positioning frame 1 is a steel arch frame erected at the last roof near a tunnel face; a plurality of pipe shed positioning holes 101 are formed in the simple positioning frame 1, a hole inner pipe shed 2 is arranged in the pipe shed positioning holes 101, the hole inner pipe shed 2 integrally inclines upwards and extends into surrounding rocks in front of a tunnel face, and a built-in pipe shed bracket structure 3 which is reversely lengthened is arranged at the tail end of the hole inner pipe shed 2.
The built-in pipe shed bracket structure 3 comprises a rotatable pipe connecting device, and an arc-shaped steel support is arranged at the bottom of the rotatable pipe connecting device.
The rotatable adapter tube device comprises a base 301, a wedge-shaped cutting groove 302 obliquely arranged is formed in the base 301, a mounting groove 303 is formed in one side, close to the lower oblique side of the wedge-shaped cutting groove 302, an elastic connector 304 is arranged on the other side of the wedge-shaped cutting groove 302, a long connecting sleeve assembly 305 is arranged in the wedge-shaped cutting groove 302, one end of the long connecting sleeve assembly 305 is hinged to a hinge shaft arranged in the mounting groove 303, the other end of the long connecting sleeve assembly 305 is connected with the elastic connector 304, and the long connecting sleeve assembly 305 is attached to the wedge-shaped cutting groove 302 under the restoring force action of the elastic connector 304.
The base 301 is a rectangular base.
The extension sleeve assembly 305 comprises a solid hinge rod 3051, one end of the solid hinge rod 3051 is hinged with the mounting groove 303 through a hinge shaft, a hollow extension sleeve 3052 matched with the pipe shed 2 in the hole is arranged at the other end of the solid hinge rod 3051, and a limiting mechanism 3053 is arranged on the outer side of the hollow extension sleeve 3052; the tail end of the pipe shed 2 in the hole is sleeved in the hollow extension sleeve 3052 and is tightly supported and limited through a limiting mechanism 3053. Specifically, the hollow extension sleeve 3052 is rigidly connected with the solid hinge rod 3051, and the pipe diameter of the hollow extension sleeve 3052 is set to be phi 120 mm; the limiting mechanism 3053 can be a telescopic limiting screw rod, and is arranged on two side edges of the hollow extension sleeve 3052, so that the operation is more convenient and faster.
The elastic connecting piece 304 comprises an elastic connecting rope 3041, one end of the elastic connecting rope 3041 is fixedly connected with the base 301, and the other end is screwed with a connecting end cap 3042; a threading hole is formed in the solid hinge rod 3051 of the extension sleeve assembly 305, and the elastic connection rope 3041 passes through the threading hole of the extension sleeve assembly 305 and is connected and limited by the connection end cap 3042.
The length of the elastic connection rope 3041 is set according to the rotation angle of the extension sleeve assembly 305, and the length of the elastic connection rope can make the rotation angle of the extension sleeve assembly within the range of 5-15 °.
The slope gradient of the wedge-shaped cutout 302 is set to 5 °.
The driving angle of the pipe shed 2 in the tunnel is 5-10 degrees.
The arc-shaped steel supports are spliced temporary arch protection structures 306 arranged along the outline of the tunnel, the spliced temporary arch protection structures 306 are formed by splicing I20a I-shaped steel, and the lower portions of the I-shaped steel are fixedly connected with the existing primary support of the tunnel into a whole through a sprayed concrete connecting structure 307, so that the temporary arch protection is longitudinally stable and does not have toppling accidents.
A method for directly constructing a tunnel inner shed comprises the following steps:
s1, according to the instability condition of the tunnel face, carrying out back-pressure backfill on the face by using the tunnel slag or the permeable stone, and forming a construction platform 4;
s2, taking the last erected steel arch frame near the tunnel face as a simple positioning frame 1, and processing a plurality of pipe shed positioning holes 101 at the web position of the simple positioning frame 1 along the contour of the tunnel arch part;
s3, obliquely and upwards driving the pipe shed 2 into the tunnel from the inside of the pipe shed positioning hole 101 along the surrounding rock direction in front of the tunnel face;
s4, after the inner pipe shed 2 is arranged, high-pressure grouting construction of the inner pipe shed 2 is carried out by adopting grouting equipment;
s5, reversely lengthening the pipe shed 2 along the rear part of the tunnel face at the tail end of the pipe shed in the tunnel to form a reliably stressed built-in pipe shed bracket structure 3;
s6, carrying out tunnel face tunneling and supporting construction in sequence under the protection of the pipe shed 2 in the tunnel;
s7: after a collapse body or a soft broken zone at the tail end of the pipe shed is effectively penetrated through the excavated tunnel face, and at least 2-3 pieces of primary I-shaped steel 5 are arranged under the pipe shed 2 in the tunnel, the built-in pipe shed bracket structure 3 is dismantled;
and S8, after all the built-in pipe shed bracket structures 3 are removed, constructing the primary support of the area and spraying concrete, so that the pipe sheds 2 in the tunnel are completely covered in the primary support.
In step S1, if the surrounding rock on the tunnel face becomes rapidly worse but the tunnel face collapse accident has not been developed, the tunnel face is back-pressure backfilled by using the hole slag or the permeable stone to form the construction platform 4, and the inclined drainage holes can be arranged in front of the tunnel face to drain the underground water under the condition of water-rich surrounding rock;
if the face is subjected to scale collapse or roof fall, firstly, carrying out back-pressure backfilling on the face by using hole slag or permeable stone to form a construction platform 4; then carrying out concrete spraying reinforcement or grouting reinforcement on the collapse body to ensure that the collapse body is relatively stable; the construction can not block the underground water drainage channel, and inclined drainage holes are arranged to drain the underground water when necessary.
In step S2, the last erected steel arch near the tunnel face is used as the simple positioning frame 1, and the simple processing is performed:
1) a phi 60 or phi 76 locking anchor pipe 6 is additionally arranged at the arch springing of the steel arch frame, and the length is controlled to be 4.5-6.0 m;
2) adopt the electric welding cutting mode to carry out the cutting work of pipe canopy locating hole 101 in simple and easy locating rack 1 web position, the position and the quantity of pipe canopy locating hole 101 are confirmed according to the construction scheme, and general pipe canopy locating hole 101 setting range is tunnel hunch portion 120 scope, and the setting quantity is 27 ~ 35 to adjacent pipe canopy locating hole 101 is equidistance or not equidistance setting, specifically, to the severe region of unstability, pipe canopy locating hole 101 is encrypted and is arranged, otherwise can reduce pipe canopy locating hole 101 quantity relatively.
In the step S3, drilling construction of the portal pipe shed 2 is carried out by using a down-the-hole drill or other drilling equipment by means of the pipe shed positioning hole 101 on the simple positioning frame 1, and a pipe-following drill process is adopted for a section with serious hole collapse of the surrounding rock; the tunnel inner pipe shed 2 is made of phi 89 or phi 108 grouting tempering pipes, the length of a steel pipe is preferably controlled within the range of 8-15 m, and the construction angle of the pipe shed is controlled within the range of 5-10 degrees.
In step S4, after the tunnel inner pipe shed 2 is arranged, high-pressure grouting construction is carried out by adopting grouting equipment, and the water-cement ratio adopted in a general section is 1:1 (weight ratio) of cement mortar; the cement-water glass double grout can be adopted in the water-rich area, and the grouting parameters of the cement-water glass double grout are as follows: s =1 (0.6-1.0) (volume ratio), cement paste water cement ratio of 0.8: 1-1: 1, water glass modulus of 2.6-2.8, and water glass concentration of 35B; the initial grouting pressure is 0.5-1.0 MPa, and the final pressure is 2.0 MPa; before grouting, performing a field grouting test, adjusting grouting parameters according to actual conditions, and acquiring grouting construction experience of the pipe shed;
and after grouting, filling the steel pipes with M20 cement mortar, and adding a reinforcement cage made of 4 phi 20 reinforcements in the pipe shed if necessary to improve the rigidity of the pipe body of the pipe shed.
In step S5, the specific construction steps of the built-in pipe shed bracket structure 3 are as follows:
(1) the tail end of the in-tunnel pipe shed 2 is sleeved in a hollow extension sleeve 3052 of the rotatable adapter pipe device, and the in-tunnel pipe shed 2 is tightly propped and clamped by a limiting mechanism 3053, so that the hollow extension sleeve 3052 is fixedly connected with the in-tunnel pipe shed 2; at this time, the base 301 is lifted by the elastic connecting rope 3041 through the hollow extension sleeve 3052 positioned with the tunnel inner shed 2, so that the base 301 is prevented from rotating and swinging up and down at the suspension stage below;
(2) each in-tunnel pipe shed 2 corresponds to one set of rotatable pipe connecting device, after all the rotatable pipe connecting devices are installed, an arc-shaped steel support 306 is erected at each of the front end and the rear end of a base 301 of each rotatable pipe connecting device to support the rotatable pipe connecting devices, and the arc-shaped steel supports 306 and the existing primary supports of the tunnel are fixedly connected into a whole through a sprayed concrete connecting structure 307; thus, the installation and construction of the built-in pipe shed bracket structure 3 at the tail end of the pipe shed 2 in the tunnel are completed.
Specifically, the tail end of the pipe shed 2 in the tunnel is embedded into the surrounding rock shallowly, so that a good grouting stop section is not provided, and the grouting effect is not good; meanwhile, the tail end of the pipe shed 2 in the tunnel is a collapse body or a weak crushing section, and the self-stability of the surrounding rock of the tunnel is poor; the stress of the tail end of the pipe shed 2 in the tunnel is mainly the bending action of the beam body of the pipe shed body, and at the moment, a reliable vertical supporting structure is ensured to be arranged at the front and the back of the pipe shed, so that the conventional construction technology of the pipe shed in the tunnel cannot provide effective support for the tail end of the pipe shed, the pipe shed is easy to sink under the vertical load action of surrounding rocks of the arch part, and the whole pipe shed is further ineffective; by reversely lengthening the tail end of the pipe roof 2 in the tunnel, the built-in pipe roof bracket structure 3 with reliable construction stress can effectively solve the construction problem.
In step S6, under the protection of the tunnel internal canopy 2, performing tunnel face excavation and support construction, and performing erection construction and preliminary support shotcrete construction of a primary steel frame under the tunnel internal canopy 2 in a manner of 'excavating one roof truss and supporting one roof truss';
in step S7, the dismantling process of the pipe shed bracket structure 3 is opposite to the construction process, and specifically includes the following steps:
1) removing two arc-shaped steel supports 306 below the rotatable pipe connecting device;
2) the limit of the limiting mechanism 3053 on the pipe shed 2 in the hole is removed, so that the rotatable pipe device can be detached from the tail end of the pipe shed 2 in the hole, and the subsequent construction can be repeatedly used.
In step S8, after all the rotatable pipe connecting devices are dismantled, the primary support of the area is constructed and sprayed with concrete, and the pipe shed 2 in the tunnel is completely covered in the primary support; if the tail end of the pipe shed 2 in the tunnel partially protrudes out of the primary support, the protruding part is cut off.
And finishing the whole construction of the tunnel pipe shed 2, and then performing tunnel driving construction under the protection of the tunnel pipe shed 2 according to normal construction steps.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention without departing from the technical spirit of the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a built-in pipe shed strutting arrangement which characterized in that: the device comprises a simple positioning frame (1), wherein the simple positioning frame (1) is a steel arch frame erected at the last frame near a tunnel face; a plurality of pipe shed positioning holes (101) are formed in the simple positioning frame (1), pipe sheds (2) in holes are arranged in the pipe shed positioning holes (101), the pipe sheds (2) in the holes are integrally inclined upwards and deeply penetrate into surrounding rocks in front of a tunnel face, and a built-in pipe shed bracket structure (3) which is reversely lengthened is arranged at the tail end of the pipe shed bracket structure.
2. The built-in pipe shed support device of claim 1, wherein: the built-in pipe shed bracket structure (3) comprises a rotatable pipe connecting device, and an arc-shaped steel support is arranged at the bottom of the rotatable pipe connecting device.
3. The built-in pipe shed support device of claim 2, wherein: the rotatable adapter tube device comprises a base (301), a wedge-shaped cutting groove (302) which is obliquely arranged is formed in the base (301), an installation groove (303) is formed in one side, close to the wedge-shaped cutting groove (302), of the wedge-shaped cutting groove downwards in an inclined mode, an elastic connector (304) is arranged on the other side, a lengthening sleeve assembly (305) is arranged in the wedge-shaped cutting groove (302), one end of the lengthening sleeve assembly (305) is hinged to a hinge shaft arranged in the installation groove (303), the other end of the lengthening sleeve assembly is connected with the elastic connector (304), and the lengthening sleeve assembly (305) is attached to the wedge-shaped cutting groove (302) under the restoring force action of the elastic connector (304).
4. The built-in pipe shed support device of claim 2, wherein: the arc-shaped steel support is a spliced temporary arch protection structure (306) arranged along the outline of the tunnel, the spliced temporary arch protection structure (306) is formed by splicing I20a I-shaped steel, and the lower portion of the I-shaped steel is fixedly connected with the existing primary support of the tunnel into a whole through a sprayed concrete connection structure (307).
5. A method for directly constructing a tunnel internal shed is characterized in that: the method comprises the following steps:
s1, according to the instability condition of the tunnel face, carrying out back-pressure backfill on the face by using the hole slag or the permeable stone material to form a construction platform (4);
s2, taking the last erected steel arch frame near the tunnel face as a simple positioning frame (1), and processing a plurality of pipe shed positioning holes (101) at the web position of the simple positioning frame (1) along the contour of the tunnel arch part;
s3, obliquely and upwards driving the pipe shed (2) into the tunnel along the surrounding rock direction in front of the tunnel face from the inside of the pipe shed positioning hole (101);
s4, after the pipe shed (2) in the tunnel is built, high-pressure grouting construction of the pipe shed (2) in the tunnel is carried out by adopting grouting equipment;
s5, conducting reverse lengthening on the pipe shed along the rear part of the tunnel face at the tail end of the pipe shed (2) in the tunnel to form a reliably stressed built-in pipe shed bracket structure (3);
s6, carrying out tunnel face tunneling and supporting construction in sequence under the protection of the pipe shed (2) in the tunnel;
s7: after a collapse body or a soft broken zone at the tail end of a pipe shed is effectively penetrated through an excavated tunnel face, and at least 2-3 pieces of primary I-shaped steel (5) are arranged below the pipe shed (2) in the tunnel, dismantling construction of a built-in pipe shed bracket structure (3) is carried out;
s8, after all the built-in pipe shed bracket structures (3) are removed, the primary support of the area is constructed and sprayed with concrete, so that the pipe shed (2) in the tunnel is completely covered in the primary support.
6. The method for directly constructing a tunnel shed according to claim 5, wherein: in the step S1, if surrounding rock of the tunnel face is rapidly changed but a tunnel face collapse accident is not developed, the tunnel face is back-pressure backfilled by using the hole slag or the permeable stone to form a construction platform (4);
if the face is subjected to scale collapse or roof fall, firstly, carrying out back-pressure backfilling on the face by using hole slag or permeable stone to form a construction platform (4); then carrying out concrete spraying reinforcement or grouting reinforcement on the collapse body so as to ensure that the collapse body is relatively stable;
the construction can not block the underground water drainage channel, and inclined drainage holes are arranged to drain the underground water when necessary.
7. The method for directly constructing a tunnel shed according to claim 5, wherein: in step S2, the last erected steel arch near the tunnel face is used as a simple positioning frame (1), and the simple processing is performed:
1) a phi 60 or phi 76 foot-locking anchor pipe (6) is additionally arranged on the steel arch springing, and the length is controlled to be 4.5-6.0 m;
2) adopt the electric welding cutting mode to carry out the cutting work of pipe canopy locating hole (101) in simple and easy locating rack (1) web position, the position and the quantity of pipe canopy locating hole (101) are confirmed according to the construction scheme, and pipe canopy locating hole (101) range of setting is tunnel hunch portion 120 scope, and the quantity of setting is 27 ~ 35 to adjacent pipe canopy locating hole (101) are equidistance or not equidistance setting.
8. The method for directly constructing a tunnel shed according to claim 5, wherein: in the step S3, drilling construction of the tunnel portal pipe shed (2) is carried out by using a down-the-hole drill or other drilling equipment by means of a pipe shed positioning hole (101) on the simple positioning frame (1), and a pipe-following drill process is adopted for a section with serious collapse of surrounding rocks; the pipe shed (2) in the tunnel adopts phi 89 or phi 108 grouting steel pipes, the length of each steel pipe is preferably controlled within the range of 8-15 m, and the construction angle of the pipe shed is controlled within the range of 5-10 degrees.
9. The method for directly constructing the tunnel-in-tunnel shed as claimed in claim 5, wherein: and step S4, after the pipe shed (2) in the tunnel is built, high-pressure grouting construction is carried out by adopting grouting equipment, after the grouting is finished, M20 cement mortar is used for filling the steel pipe, and a reinforcement cage made of 4 phi 20 steel bars is additionally arranged in the pipe shed so as to improve the rigidity of the pipe body of the pipe shed.
10. The method for directly constructing a tunnel shed according to claim 5, wherein: in step S5, the concrete construction steps of the pipe shed bracket structure (3) are as follows:
a. the tail end of the pipe shed (2) in the tunnel is sleeved with a hollow extension sleeve (3052) of a rotatable pipe connecting device, and the pipe shed (2) in the tunnel is tightly propped and clamped by a limiting mechanism (3053), so that the hollow extension sleeve (3052) is fixedly connected with the pipe shed (2) in the tunnel; at the moment, the base (301) is lifted by the elastic connecting rope (3041) through the hollow extension sleeve (3052) positioned with the pipe shed (2) in the tunnel, so that the base (301) is prevented from rotating and swinging up and down in a suspension stage below;
b. each in-tunnel pipe shed (2) corresponds to one set of rotatable pipe connecting device, after all the rotatable pipe connecting devices are installed, arc-shaped steel supports (306) are erected at the front end and the rear end of a base (301) of each rotatable pipe connecting device to support the rotatable pipe connecting devices, and the arc-shaped steel supports (306) are fixedly connected with the existing primary supports of the tunnel into a whole through a sprayed concrete connecting structure (307); thus, the installation construction of the pipe shed bracket structure (3) arranged in the tail end of the pipe shed (2) in the tunnel is completed;
in step S6, tunnel face excavation and support construction are performed under the protection of the tunnel pipe shed (2), and erection construction and preliminary support shotcrete construction of the primary steel frame under the tunnel pipe shed (2) are performed in a manner of "excavation one roof truss and support one roof truss".
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210861042.9A CN115095357A (en) | 2022-07-22 | 2022-07-22 | Built-in pipe shed supporting device and direct construction method of pipe shed in tunnel |
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| CN202210861042.9A CN115095357A (en) | 2022-07-22 | 2022-07-22 | Built-in pipe shed supporting device and direct construction method of pipe shed in tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116733491A (en) * | 2023-08-14 | 2023-09-12 | 交通运输部公路科学研究所 | Water-rich karst tunnel reinforcing device and rapid construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116733491A (en) * | 2023-08-14 | 2023-09-12 | 交通运输部公路科学研究所 | Water-rich karst tunnel reinforcing device and rapid construction method |
| CN116733491B (en) * | 2023-08-14 | 2023-11-03 | 交通运输部公路科学研究所 | Water-rich karst tunnel reinforcing device and rapid construction method |
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