CN208441875U - One kind being able to achieve prestressed assembled tunnel support device - Google Patents
One kind being able to achieve prestressed assembled tunnel support device Download PDFInfo
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- CN208441875U CN208441875U CN201820944345.6U CN201820944345U CN208441875U CN 208441875 U CN208441875 U CN 208441875U CN 201820944345 U CN201820944345 U CN 201820944345U CN 208441875 U CN208441875 U CN 208441875U
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- 230000035939 shock Effects 0.000 description 6
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- Lining And Supports For Tunnels (AREA)
Abstract
The utility model discloses one kind to be able to achieve prestressed assembled tunnel support device, and device includes: top bar assembly rigid protection structure and assembled rigid protection structure of getting out of a predicament or an embarrassing situation；Wherein, the top bar inner wall shape in the shape and tunnel of top bar assembly rigid protection structure matches, and energy supporting is on the top bar inner wall in tunnel；The inner wall shape of getting out of a predicament or an embarrassing situation got out of a predicament or an embarrassing situation in the shape and tunnel of assembled rigid protection structure matches, can supporting getting out of a predicament or an embarrassing situation on inner wall in tunnel；The opposite end of top bar assembly rigid protection structure and assembled rigid protection structure of getting out of a predicament or an embarrassing situation connects and composes the assembled rigid protection structure of entire tunnel inner wall.The suspension device is due to being splicing structure, convenient to use and good, the large carrying capacity of rigidity.
Description
Technical Field
The utility model relates to an underground tunnel supports the field, especially relates to an assembled tunnel supporting device that can realize prestressing force.
Background
In the field of tunnel support, reinforced concrete is commonly adopted to support tunnels or underground caverns at present. However, the construction of net spraying concrete has the problems of low construction speed, difficult guarantee of net spraying quality, heavy dust pollution, poor operation condition and the like. Particularly, concrete belongs to a rigid material, cracks are easy to generate under the action of vibration load, water leakage is caused, the problem of frost heaving exists in high and cold areas, and hidden dangers are brought to tunnel safety. At present, there is also a technology for supporting a tunnel by assembling corrugated plates, for example, chinese patent (CN107435547A) discloses a scheme for supporting a tunnel by assembling corrugated plates. However, it has at least the following problems: due to the insufficient rigidity of the corrugated plate, the ground settlement caused by the deformation of the soil body under the action of large load is large; cement slurry is filled at the back, so that the filling is not easy to compact, and cracks are easy to generate under the action of long-term vibration load; a waterproof layer needs to be independently applied, and the process is complex; and the corrugated plate is adopted for supporting, so that the bearing capacity is insufficient. Therefore, the existing structure for supporting the tunnel and the underground cavern (generally a transverse space) has the problems of poor supporting stability, large stratum deformation, complex process, long construction period and the like.
SUMMERY OF THE UTILITY MODEL
Based on the problem that prior art exists, the utility model aims at providing a can realize assembled tunnel supporting device of prestressing force, can strut tunnel and underground cavern, strut the rigidity good, bearing capacity is big to the support rigidity of solving current tunnel supporting construction existence is not good, the stratum warp big and technology is complicated, construction cycle is long scheduling problem.
The utility model aims at realizing through the following technical scheme:
the utility model discloses embodiment provides a can realize assembled tunnel supporting device of prestressing force, include:
the upper step assembling rigid supporting structure and the lower step assembling rigid supporting structure; wherein,
the upper step assembly rigid supporting structure consists of a plurality of upper corrugated plate assemblies, a plurality of upper steel arch assemblies, upper connecting assemblies and upper longitudinal connecting pieces, wherein the plurality of upper corrugated plate assemblies and the plurality of upper steel arch assemblies are connected together through the upper connecting assemblies in a mode that one upper corrugated plate assembly is alternately arranged with one upper steel arch assembly, the plurality of upper corrugated plate assemblies and the plurality of upper steel arch assemblies are integrally connected with the upper longitudinal connecting pieces to form the upper step assembly rigid supporting structure, and the shape of the upper step assembly rigid supporting structure is matched with the shape of the inner wall of an upper step in a tunnel and can be supported on the inner wall of the upper step in the tunnel;
the lower step assembly rigid supporting structure consists of a plurality of lower corrugated plate assemblies, a plurality of lower steel arch assemblies, a lower connecting assembly and a lower longitudinal connecting piece, wherein the plurality of lower corrugated plate assemblies and the plurality of lower steel arch assemblies are connected together through the upper connecting assembly in a mode that one lower corrugated plate assembly is arranged in turn with one lower steel arch assembly;
and the opposite ends of the upper step assembly rigid supporting structure and the lower step assembly rigid supporting structure are connected to form an assembly rigid supporting structure of the whole tunnel inner wall.
By the foregoing the utility model provides a technical scheme can see out, the embodiment of the utility model provides a can realize assembled tunnel supporting device of prestressing force, its beneficial effect is:
the upper step splicing rigid supporting structure respectively consisting of a plurality of upper corrugated plate assemblies, a plurality of upper steel arch assemblies and upper connecting assemblies is matched with the lower step splicing rigid supporting structure consisting of a plurality of lower corrugated plate assemblies, a plurality of lower steel arch assemblies and lower connecting assemblies to form the splicing rigid supporting structure capable of supporting the whole inner wall of the tunnel. The upper step and the lower step are assembled to form the rigid supporting structure in a mode that corrugated plate assemblies (namely the upper corrugated plate assemblies and the lower corrugated plate assemblies) and steel arch assemblies (namely the upper steel arch assemblies and the lower steel arch assemblies) are alternately arranged at intervals, the rigidity of each supporting structure is improved, the bearing capacity of each supporting structure is further improved, longitudinal connecting pieces (namely the upper longitudinal connecting pieces and the lower longitudinal connecting pieces) are arranged, the overall strength and the stability of each supporting structure are improved, and the stability of the upper step assembled supporting structure which is assembled firstly in construction can be well guaranteed. Because the upper corrugated plate component and the lower corrugated plate component are arranged, grouting filling can be performed on the back of the corrugated plate component, if the filling compactness is ensured, a prestress is applied to a soil body, the formation deformation is reduced, the ground settlement is also reduced, and the prestress supporting is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a tunnel supporting device according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a tunnel longitudinal section of a tunnel supporting method according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic view taken at A in FIG. 2;
fig. 4 is a schematic cross-sectional view of a horseshoe tunnel supporting device according to an embodiment of the present invention;
in the figure: 1-step up; 2-core soil; 3-descending a step; 4-assembling a rigid supporting structure on the upper step; 41-upper corrugated plate assembly; 411 — first daughter board; 412-a second daughter board; 413-corrugated plate temporary plugging block; 42-upper steel arch assembly; 421-a first subrack; 422-a second subrack; 423-temporary blocking block of steel arch frame; 43-an upper connection assembly; 431-bolt; 432-a gasket; 44-upper longitudinal connectors; 45-synchronous grouting filling area; 46-secondary grouting pipe; b-splicing seams between the upper corrugated plate components; 5, assembling a rigid supporting structure by a lower step; 51-lower corrugated sheet assembly; 511-a third daughter board; 512-a fourth daughter board; 52-lower steel arch assembly; 521-a third subrack; 522-a fourth subrack; 53-lower longitudinal connectors; 6-soil body
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific contents of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
As shown in fig. 1 to 2, an embodiment of the present invention provides an assembled tunnel supporting device capable of realizing prestress, including:
the upper step assembling rigid supporting structure and the lower step assembling rigid supporting structure; wherein,
the upper step assembly rigid supporting structure consists of a plurality of upper corrugated plate assemblies, a plurality of upper steel arch assemblies, upper connecting assemblies and upper longitudinal connecting pieces, wherein the plurality of upper corrugated plate assemblies and the plurality of upper steel arch assemblies are connected together through the upper connecting assemblies in a mode that one upper corrugated plate assembly is alternately arranged with one upper steel arch assembly, the plurality of upper corrugated plate assemblies and the plurality of upper steel arch assemblies are integrally connected with the upper longitudinal connecting pieces to form the upper step assembly rigid supporting structure, and the shape of the upper step assembly rigid supporting structure is matched with the shape of the inner wall of an upper step in a tunnel and can be supported on the inner wall of the upper step in the tunnel;
the lower step assembly rigid supporting structure consists of a plurality of lower corrugated plate assemblies, a plurality of lower steel arch assemblies, a lower connecting assembly and a lower longitudinal connecting piece, wherein the plurality of lower corrugated plate assemblies and the plurality of lower steel arch assemblies are connected together through the upper connecting assembly in a mode that one lower corrugated plate assembly is arranged in turn with one lower steel arch assembly;
and the opposite ends of the upper step assembly rigid supporting structure and the lower step assembly rigid supporting structure are connected to form an assembly rigid supporting structure of the whole tunnel inner wall.
The above-mentioned support device still includes: the temporary support frame is of a long strip-shaped structure, and a support surface for supporting the bottom end of the upper corrugated plate assembly and the bottom end of the upper steel arch assembly is arranged in the temporary support frame. Preferably, the temporary support frame is an elevation-type temporary support frame (see fig. 3) provided with a height self-adjusting device, and the height of the temporary support frame can be adjusted through the height self-adjusting device. Preferably, height self-adjusting device can be a plurality of, distributes and establishes on the interim support frame body, can be lead screw lift strutting arrangement, comprises screw nut, lead screw and supporting legs, and screw nut is fixed to be established on interim support frame body, and the lead screw cooperation is established in screw nut, and the lead screw bottom sets up the supporting legs, and the lead screw top sets up the spanner, and rotatory lead screw can adjust its height that supports interim support frame body, realizes adjusting interim support frame height. Preferably, the lead screw can be marked with scales. It should be understood that the above description is only a preferred structure of the height self-adjusting device, and other height adjusting devices of known structures may be adopted as long as the height of the temporary support frame can be adjusted.
Referring to fig. 1, in the rigid supporting structure is assembled to the upper step of the above-mentioned supporting device, each upper corrugated plate component includes:
the corrugated plate temporary plugging block comprises a first sub-plate, a second sub-plate, a corrugated plate temporary plugging block and a corrugated plate connecting piece; wherein,
the first sub-plate, the second sub-plate and the corrugated plate temporary plugging blocks are all arc-shaped structures, and can be spliced into semicircular structures after being connected by corrugated plate connecting pieces; preferably, the corrugated plate connecting piece adopts a bolt; the temporary plugging block of the corrugated plate has the function that when the rigid supporting structure is assembled by the upper step in advance, the shape matched with the inner wall of the upper step is formed, and the temporary plugging block of the corrugated plate can be conveniently detached from the rigid supporting structure assembled by the lower step, so that the rigid supporting structure assembled by the upper step and the lower step are butted and sealed to form a ring.
Among the rigid support structure is assembled to the upper step, every goes up steel bow member subassembly and includes:
the steel arch frame comprises a first sub frame, a second sub frame and a steel arch frame time blocking block and a steel arch frame connecting piece; wherein,
the first sub-frame, the second sub-frame and the temporary plugging block of the steel arch frame are all arc-shaped structures, and the first sub-frame, the second sub-frame and the temporary plugging block of the steel arch frame can be spliced into a semicircular structure after being connected by a steel arch frame connecting piece; preferably, the steel arch frame connecting piece adopts a bolt; the temporary blocking block of the steel arch frame has the function that when the rigid supporting structure assembled by the upper step is assembled in advance, the shape matched with the inner wall of the upper step is formed, and the temporary blocking block of the steel arch frame can be conveniently disassembled when the rigid supporting structure assembled by the lower step is assembled, so that the rigid supporting structure assembled by the upper step and the lower step is butted and sealed to form a ring.
Among the rigid support structure is assembled to the upper step, every goes up coupling assembling and includes:
a plurality of gaskets and a plurality of bolts; wherein,
the plurality of sealing gaskets are arranged between the adjacent joints of the upper corrugated plate assembly and the upper steel arch assembly; the preferable sealing gasket can be made of a water-swelling water-stopping material, the waterproof sealing performance is better, and the bolt is a U-shaped bolt, so that the connection is convenient.
In the rigid support structure is assembled to above-mentioned strutting arrangement's lower step, every corrugated plate subassembly includes down:
the third sub-plate, the fourth sub-plate and the corrugated plate connecting piece; wherein,
the third sub-board and the fourth sub-board are both arc-shaped structures, and can be connected through corrugated plate connecting pieces and then spliced into the arc-shaped structures;
in the rigid support structure is assembled to lower step, every lower steel bow member subassembly includes:
the third sub-frame, the fourth sub-frame and the steel arch frame connecting piece; wherein,
the third sub-frame and the fourth sub-frame are both arc-shaped structures, and can be spliced into the arc-shaped structures after being connected through the steel arch connecting piece;
in the rigid support structure is assembled to lower step, every lower coupling assembling includes:
a plurality of gaskets and a plurality of bolts; wherein,
and a plurality of sealing gaskets are arranged between the joints of the adjacent lower corrugated plate assemblies and the lower steel arch assembly. The preferable sealing gasket can be made of a water-swelling water-stopping material, the waterproof sealing performance is better, and the bolt is a U-shaped bolt, so that the connection is convenient.
The lower corrugated plate component and the lower steel arch assembly of the arc-shaped structure integrally form a lower step splicing rigid supporting structure of the arc-shaped structure, and the lower corrugated plate component and the lower steel arch assembly form a circular or quasi-circular supporting structure together with an upper step splicing rigid supporting structure, so that the lower corrugated plate component and the lower steel arch assembly are suitable for supporting a tunnel with a circular or quasi-circular section (see figure 1).
Preferably, last longitudinal tie spare among the above-mentioned supporting device all adopts many steel pipes with lower longitudinal tie spare, and evenly distributed connects on each buckled plate, can improve whole supporting construction's steadiness, and then improves the bearing capacity, and every steel pipe all can adopt the sub-steel pipe that the multistage can link together to constitute, forms the longitudinal tie spare that can prolong.
In the supporting device, the back of the upper corrugated plate component and the back of the lower corrugated plate component of the rigid supporting structure assembled by the upper step and the lower step are both synchronous grouting filling areas, synchronous grouting filling can be carried out, and the grouting material can be foamed concrete with micro-expansion performance or a high polymer material with expansion characteristic, so that the purpose of densely filling gaps behind the structure is achieved. When the high molecular polymer material is adopted for grouting, the high molecular polymer material can well play roles in water stopping, shock absorption, shrinkage prevention and the like. The secondary grouting pipes are pre-buried behind the upper and lower steel arches, and secondary grouting treatment can be carried out under the condition that synchronous grouting filling is not compact through the secondary grouting pipes, so that the supporting structure is completely and compactly filled behind the supporting structure, and water leakage is prevented.
It will be appreciated that in the above description, references to upper and lower corrugated plate assemblies and to upper and lower steel arch assemblies, upper and lower connecting assemblies, upper and lower longitudinal connecting members are merely intended to distinguish the components by name, and not to limit their location of use.
As shown in fig. 4, in the lower step-built rigid supporting structure of the above supporting device, each lower corrugated plate assembly includes:
a third sub-board and a fourth sub-board; wherein,
the third sub-board and the fourth sub-board are both in a straight board structure, and are vertically arranged in a parallel structure separately;
in the rigid support structure is assembled to lower step, every lower steel bow member subassembly includes:
a third sub-frame and a fourth sub-frame; wherein,
the third sub-frame and the fourth sub-frame are both of straight plate structures, and are vertically arranged in parallel separately.
Above-mentioned rigid support structure is assembled to lower step still includes: and the permanent support frame is supported between the lower corrugated plate assembly and the bottom of the lower steel arch assembly.
In the supporting device, the sub-frames of the upper steel arch frame assembly and the lower steel arch frame assembly are made of section steel, and preferably made of I-shaped steel with I-shaped sections, so that the rigidity of the whole supporting device can be effectively improved, and the supporting device is also convenient to be connected with the upper corrugated plate assembly and the lower corrugated plate assembly.
The lower corrugated plate component and the lower steel arch assembly of the straight plate structure integrally form a lower step assembly rigid supporting structure with a parallel structure, and form a horseshoe-shaped supporting structure with an upper circle and a lower parallel structure with an upper step assembly rigid supporting structure, so that the lower corrugated plate component and the lower steel arch assembly are suitable for supporting a tunnel with a horseshoe-shaped section (see fig. 4).
Referring to fig. 2 (the position indicated by the roman alphabet in fig. 2, the position for each step of construction), the embodiment of the present invention further provides a method for supporting an assembled tunnel capable of implementing a pre-stress, which adopts the above-mentioned assembled tunnel supporting apparatus capable of implementing a pre-stress, including the following steps:
i, grouting and reinforcing soil in front of an excavation surface of an excavated tunnel;
step II, annularly excavating an upper step in the excavated tunnel in a manner of reserving core soil;
step III, installing a temporary support frame on the inner wall of the excavated upper step, then forming an upper step assembly support structure by assembling an upper corrugated plate, an upper longitudinal connecting piece capable of being extended and an upper steel arch frame, and synchronously grouting the back of the formed upper step assembly support structure;
step IV, excavating a lower step;
and step V, dismantling the temporary support frame on the inner wall of the upper step, forming a lower step assembly supporting structure on the inner wall of the lower step by assembling a lower corrugated plate, a lower longitudinal connecting piece capable of being extended and an assembly lower steel arch frame, wherein the lower step assembly supporting structure is in butt joint with the upper step assembly supporting structure to form an assembly rigid supporting structure of the whole inner wall of the tunnel, and synchronously grouting the back of the formed lower step assembly supporting structure to finish the supporting of the assembled tunnel.
In step III of the method, a temporary support frame is installed on the inner wall of the excavated upper step, and then an upper step assembling support structure formed by assembling an upper corrugated plate, an upper longitudinal connecting piece capable of being extended and an upper steel arch is formed as follows:
two temporary support frames are arranged at the bottoms of two ends of the semicircular inner wall of the upper step;
assembling upper corrugated plates on the inner walls of the upper steps, wherein the bottoms of two ends of the assembled upper corrugated plates are supported on the temporary support frame;
an upper longitudinal connecting piece capable of being extended is arranged on the assembled upper corrugated plate, and the upper longitudinal connecting piece can be extended along with the excavation of the tunnel in the tunnel excavation direction;
assembling a steel arch frame behind the assembled upper corrugated plate according to the tunnel excavation direction, wherein two ends of the assembled upper steel arch frame are supported on the temporary support frame, the assembled upper steel arch frame is hermetically connected with the assembled upper corrugated plate, and the assembled upper steel arch frame is fixedly connected with the extended upper longitudinal connecting piece;
and repeating the steps until the assembled upper corrugated plate and the assembled upper steel arch support the semicircular inner wall of the upper step, thereby completing the assembling and supporting structure of the upper step.
In step iii of the above method, the mounting of the temporary support frame is:
the temporary support frame adopts an elevation type temporary support frame provided with a height self-adjusting device, and the height of the temporary support frame can be adjusted through the height self-adjusting device;
in step III of the method, assembling the upper corrugated plate comprises the following steps:
sequentially assembling a first sub-plate, a second sub-plate and a corrugated plate temporary plugging block of the upper corrugated plate to form a semicircular corrugated plate supported on the semicircular inner wall of the upper step;
two ends of the assembled semicircular upper corrugated plate are fixedly connected with the temporary support frame through flange plates by bolts;
in step iii of the method, assembling the upper steel arch comprises:
sequentially assembling a first sub-frame, a second sub-frame and a temporary steel arch blocking block of the upper steel arch to form a semicircular upper steel arch supported on the semicircular inner wall of the upper step;
after being assembled, a sealing gasket is arranged between the adjacent upper steel arch centering and the upper corrugated plate and is connected through a connecting piece to form sealing connection; and after the upper steel arch frame is installed, installing a secondary grouting pipe behind the upper steel arch frame, and installing the secondary grouting pipe along the upper steel arch frame in the circumferential direction.
In the step V of the method, the temporary support frame on the inner wall of the upper step is dismantled, a lower step splicing support structure is formed on the inner wall of the lower step by splicing lower corrugated plates and lower steel arches, and the splicing type rigid support structure of the whole tunnel inner wall formed by the butt joint of the lower step splicing support structure and the upper step splicing support structure is as follows:
dismantling the temporary support frame on the inner wall of the upper step;
the lower buckled plate of concatenation lower step: assembling a third sub-plate of the lower corrugated plate, disassembling a corrugated plate temporary plugging block corresponding to the upper corrugated plate of the lower corrugated plate and assembling a fourth sub-plate of the lower corrugated plate, and butting the assembled lower corrugated plate and the corresponding upper corrugated plate to form a ring;
the assembled lower corrugated plate is provided with an extendable lower longitudinal connecting piece which can be extended along with the excavation of the tunnel in the tunnel excavation direction;
assembling a lower steel arch frame of the lower step: sequentially assembling a third sub-frame of the lower steel arch, disassembling a temporary steel arch sealing block of the upper steel arch corresponding to the lower steel arch and assembling a fourth sub-frame of the lower steel arch, and butting the assembled lower steel arch and the corresponding upper steel arch to form a ring;
after being assembled, a sealing gasket is arranged between the adjacent lower steel arch centering and the lower corrugated plate and is connected through a connecting piece to form sealing connection.
Further, in step v of the above method, if the lower corrugated plate and the lower steel arch are both straight plate structures, after the temporary support frame on the inner wall of the upper step is removed, the method further includes: and arranging a permanent support frame supported at the bottoms of the lower corrugated plate and the lower steel arch. Preferably, the permanent support frame is supported at the bottom of the assembled lower corrugated plate and the lower steel arch frame, and further, a transverse inverted arch can be arranged on the permanent support frame at the bottom. The condition is suitable for tunnel supporting construction with the section in the shape of a horseshoe, and the stability of the lower step splicing supporting structure of the parallel structure can be ensured.
In step iii of the above method, the synchronous grouting at the back of the formed upper step splicing support structure is:
pre-embedding a secondary grouting pipe behind the upper steel arch, installing the secondary grouting pipe along the upper steel arch in an annular manner, and synchronously grouting the back of the upper step assembly supporting structure through the secondary grouting pipe, wherein a grouting material adopted by synchronous grouting is foamed concrete with micro-expansion performance or a high polymer material with expansion characteristic;
in step V of the method, synchronously grouting at the back of the formed lower step splicing support structure:
the method comprises the steps that a secondary grouting pipe is pre-buried behind a lower steel arch, the secondary grouting pipe is installed along the upper steel arch in the circumferential direction, synchronous grouting is conducted behind a lower step assembly supporting structure through the secondary grouting pipe, and grouting materials adopted in synchronous grouting are foamed concrete with micro-expansion performance or high polymer materials with expansion characteristics. The purpose of densely filling the gap behind the structure can be achieved. When the high molecular polymer material is adopted for grouting, the high molecular polymer material can well play roles in water stopping, shock absorption, shrinkage prevention and the like.
In the upper step splicing and supporting structure of the method, splicing seams of corrugated plates on two adjacent rings are arranged in a staggered manner, and splicing seams of steel arches on two adjacent rings are arranged in a staggered manner;
in the lower step splicing and supporting structure of the method, splicing seams of corrugated plates under two adjacent rings are arranged in a staggered manner, and splicing seams of steel arches under two adjacent rings are arranged in a staggered manner.
The mode of this kind of stagger joint assembly can improve whole supporting construction's steadiness, and then improves the bearing capacity.
The embodiments of the present invention will be described in further detail below.
The first embodiment is as follows:
referring to fig. 2 and 3, this embodiment provides an assembled tunnel supporting method that can realize prestressing force, is one kind and adopts the utility model discloses the assembled tunnel supporting device that can realize prestressing force is circular tunnel earthwork excavation and the construction steps of strutting to the cross-section, include:
i, grouting reinforcement construction in a tunnel, and grouting reinforcement is carried out on a soil body in front of an excavation surface of the excavated tunnel;
step II, annularly excavating the upper step to leave core soil;
step III, mounting an upper step temporary support frame, assembling corrugated plates, prolonging longitudinal connection, assembling steel arch frames and synchronously grouting the back of a supporting structure;
(1) the temporary support frames are respectively installed on two sides of the upper step after excavation is finished, the temporary support frames are provided with height self-adjusting devices, and the height self-adjusting devices can be achieved through screws on the rotary temporary support frames.
The height self-adjusting device can ensure that the temporary support frame can still keep the horizontal and fixed height under the condition of uneven excavated earthwork.
(2) Assembling corrugated plates on upper steps: sequentially assembling the block A, the block B and the temporary plugging block; accessible flange joint or adopt the lapped form between two adjacent buckled plates, adopt the bolt to be connected fixedly between buckled plate and the interim support frame through the ring flange.
(3) Assembling an upper step steel arch frame: and (4) extending the longitudinal connection to the tunnel excavation direction, and sequentially assembling the A block, the B block and the temporary plugging block of the steel arch frame. The steel arch frame and the corrugated plate are connected through a connecting piece, preferably a U-shaped bolt is adopted for connection, a sealing gasket is arranged between the steel arch frame and the corrugated plate, and the sealing gasket can be made of a water-swelling water-stopping material. And after the installation of the upper step steel arch is finished, a secondary grouting pipe is installed behind the arch, and the secondary grouting pipe is installed annularly along the arch.
The longitudinal connection can ensure the stability of the upper step supporting structure before the tunnel is not closed into a ring, reduce the deformation of the upper step structure, and can avoid constructing a foot locking anchor pipe like a conventional method, thereby reducing the construction steps.
The U-shaped bolt connection can ensure that all operation spaces are in the tunnel in the bolt fastening process, so that the on-site installation is facilitated, and the installation speed is increased.
The secondary grouting pipe can ensure secondary grouting treatment under the condition that synchronous grouting filling is not compact, thereby ensuring that the back of the supporting structure is completely and compactly filled and preventing water leakage.
(4) Grouting is carried out on the back of the assembled upper step supporting structure, and the grouting material can be foamed concrete with micro-expansion performance or a high polymer material with expansion property, so as to achieve the purpose of densely filling gaps on the back of the structure. When the high molecular polymer material is adopted for grouting, the high molecular polymer material can well play roles in water stopping, shock absorption, shrinkage prevention and the like.
Step IV, excavating the earthwork of the lower step;
and V, dismantling the temporary support frame, assembling lower step corrugated plates, assembling steel arch frames and synchronously grouting the back of the supporting structure.
(1) Dismantling the temporary support frame positioned at the step corrugated plate and the steel waist beam part to be assembled;
(2) assembling corrugated plates of lower steps: sequentially assembling the block B, removing the temporary plugging block and assembling the block C, and sealing the corrugated plates into a ring;
(3) assembling a lower step steel arch frame: and (3) extending the longitudinal connection to the tunnel excavation direction, sequentially assembling the B blocks, the temporary plugging blocks and the C blocks of the steel arch frame, and sealing the steel arch frame into a ring. The adjacent steel arches can be connected through a flange plate, and can also be connected through an additional lining plate. The steel arch frame and the corrugated plate are connected through a connecting piece, preferably a U-shaped bolt is adopted for connection, a sealing gasket is arranged between the steel arch frame and the corrugated plate, and the sealing gasket can be made of a water-swelling water-stopping material. And after the lower step steel arch is installed, a secondary grouting pipe is installed behind the arch, and the secondary grouting pipe is installed annularly along the arch.
The longitudinal connection can improve the overall stability of the supporting structure after the tunnel is closed into a ring.
(4) And (3) grouting is carried out after the assembled lower step supporting structure is backed, and the grouting material can be foamed concrete with micro-expansion performance or a high polymer material with expansion characteristic, so as to achieve the purpose of closely filling the gap behind the structure. When the high molecular polymer material is adopted for grouting, the high molecular polymer material can well play roles in water stopping, shock absorption, shrinkage prevention and the like.
In the above-described supporting device:
(1) every two adjacent ring corrugated plates are assembled by adopting staggered joints, and every two adjacent ring steel arches are assembled by adopting staggered joints.
(2) After the corrugated plates on the two sides of the steel arch frame are installed, secondary grouting filling is carried out through the embedded secondary grouting pipes.
Example two:
referring to fig. 2 and 3, this embodiment provides an assembled tunnel supporting method that can realize prestressing force, is one kind and adopts the utility model discloses the assembled tunnel supporting device that can realize prestressing force excavates and the construction steps of strutting for the tunnel earthwork of horseshoe-shaped to the cross-section, includes:
i, grouting reinforcement construction in a tunnel, namely grouting reinforcement is carried out on a soil body in front of an excavation surface of the excavated tunnel;
step II, annularly excavating the upper step to leave core soil;
step III, mounting an upper step temporary support frame, assembling corrugated plates, prolonging longitudinal connection, assembling steel arch frames and synchronously grouting the back of a supporting structure;
(1) the temporary support frames are respectively installed on two sides of the upper step after excavation is finished, the temporary support frames are provided with height self-adjusting devices, and the height self-adjusting devices can be achieved through screws on the rotary temporary support frames.
The height self-adjusting device can ensure that the temporary support frame can still keep the horizontal and fixed height under the condition of uneven excavated earthwork.
(2) Assembling corrugated plates on upper steps: sequentially assembling the block A, the block B and the temporary plugging block; accessible flange joint or adopt the lapped form between two adjacent buckled plates, adopt the bolt to be connected fixedly between buckled plate and the interim support frame through the ring flange.
(3) Assembling an upper step steel arch frame: and (4) extending the longitudinal connection to the tunnel excavation direction, and sequentially assembling the A block, the B block and the temporary plugging block of the steel arch frame. The adjacent steel arches can be connected through a flange plate, and can also be connected through an additional lining plate. The steel arch frame and the corrugated plate are connected through a connecting piece, preferably a U-shaped bolt is adopted for connection, a sealing gasket is arranged between the steel arch frame and the corrugated plate, and the sealing gasket can be made of a water-swelling water-stopping material. And after the installation of the upper step steel arch is finished, a secondary grouting pipe is installed behind the arch, and the secondary grouting pipe is installed annularly along the arch.
The longitudinal connection can ensure the stability of the upper step supporting structure before the tunnel is not closed into a ring, reduce the deformation of the upper step structure, and can avoid constructing a foot locking anchor pipe like a conventional method, thereby reducing the construction steps.
The U-shaped bolt connection can ensure that all operation spaces are in the tunnel in the bolt fastening process, so that the on-site installation is facilitated, and the installation speed is increased.
The secondary grouting pipe can ensure secondary grouting treatment under the condition that synchronous grouting filling is not compact, thereby ensuring that the back of the supporting structure is completely and compactly filled and preventing water leakage.
(4) Grouting is carried out on the back of the assembled upper step supporting structure, and the grouting material can be foamed concrete with micro-expansion performance or a high polymer material with expansion property, so as to achieve the purpose of densely filling gaps on the back of the structure. When the high molecular polymer material is adopted for grouting, the high molecular polymer material can well play roles in water stopping, shock absorption, shrinkage prevention and the like.
Step IV, excavating the earthwork of the lower step;
and V, mounting a permanent support frame, dismounting a temporary support frame, assembling lower step corrugated plates, assembling steel arch frames and synchronously grouting the back of the supporting structure.
(1) Installing a permanent support frame positioned at the bottom of the lower step;
(2) dismantling the temporary support frame positioned at the step corrugated plate and the steel waist beam part to be assembled;
(3) assembling corrugated plates of lower steps: sequentially assembling the block B, removing the temporary plugging block and assembling the block C, wherein the corrugated plate is fixedly connected with the permanent support frame through bolts;
(4) assembling a lower step steel arch frame: and (3) the longitudinal connection is prolonged towards the tunnel excavation direction, the B block, the temporary plugging block and the C block of the steel arch frame are sequentially assembled, and the steel arch frame is fixedly connected with the permanent support frame through bolts. The steel arch frame and the corrugated plate are connected through a connecting piece, preferably a U-shaped bolt is adopted for connection, a sealing gasket is arranged between the steel arch frame and the corrugated plate, and the sealing gasket can be made of a water-swelling water-stopping material. And after the lower step steel arch is installed, a secondary grouting pipe is installed behind the arch, and the secondary grouting pipe is installed annularly along the arch.
The longitudinal connection can improve the overall stability of the supporting structure after the tunnel is closed into a ring.
(5) And installing an inverted arch structure, wherein two ends of the inverted arch structure are supported on the permanent support frame, so that the support structure is sealed into a ring.
(6) And (3) grouting is carried out after the assembled lower step supporting structure is backed, and the grouting material can be foamed concrete with micro-expansion performance or a high polymer material with expansion characteristic, so as to achieve the purpose of closely filling the gap behind the structure. When the high molecular polymer material is adopted for grouting, the high molecular polymer material can well play roles in water stopping, shock absorption, shrinkage prevention and the like.
In the above-described supporting device:
(1) every two adjacent ring corrugated plates are assembled by adopting staggered joints (namely the assembling joints of the two adjacent ring corrugated plates are arranged in a staggered manner), and every two adjacent ring steel arches are assembled by adopting staggered joints (namely the assembling joints of the two adjacent ring steel arches are arranged in a staggered manner).
(2) After the corrugated plates on the two sides of the steel arch frame are installed, secondary grouting filling is carried out through the embedded secondary grouting pipes.
The embodiment of the utility model provides a beneficial effect does: (1) each part of the supporting device is prefabricated in a factory, and the structure is assembled on site, so that the supporting device has the advantages of convenience in construction, rapidness in installation, economy, environmental friendliness, safety, high efficiency, capability of greatly reducing the construction period and the like. (2) Adopt the steel bow member and the buckled plate interval setting of shaped steel to installation longitudinal connection steel pipe is as longitudinal connecting piece, improves strutting arrangement's bearing capacity by a wide margin, (3) the assembled structure is filled behind one's back and is had the high polymer material of expansion characteristic, realizes the prestressing force of the soil body and strut, and guarantees to fill closely knit, forms a flexible inoxidizing coating to supporting construction, plays anticorrosive, waterproof effect, improves supporting construction life. (4) The reserved secondary grouting pipe can inject high molecular polymer slurry at any time when water leaks at the later stage, so that plugging treatment can be performed in time.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a can realize assembled tunnel supporting device of prestressing force which characterized in that includes:
the upper step assembling rigid supporting structure and the lower step assembling rigid supporting structure; wherein,
the upper step assembly rigid supporting structure consists of a plurality of upper corrugated plate assemblies, a plurality of upper steel arch assemblies, upper connecting assemblies and upper longitudinal connecting pieces, wherein the plurality of upper corrugated plate assemblies and the plurality of upper steel arch assemblies are connected together through the upper connecting assemblies in a mode that one upper corrugated plate assembly is alternately arranged with one upper steel arch assembly, the plurality of upper corrugated plate assemblies and the plurality of upper steel arch assemblies are integrally connected with the upper longitudinal connecting pieces to form the upper step assembly rigid supporting structure, and the shape of the upper step assembly rigid supporting structure is matched with the shape of the inner wall of an upper step in a tunnel and can be supported on the inner wall of the upper step in the tunnel;
the lower step assembly rigid supporting structure consists of a plurality of lower corrugated plate assemblies, a plurality of lower steel arch assemblies, a lower connecting assembly and a lower longitudinal connecting piece, wherein the plurality of lower corrugated plate assemblies and the plurality of lower steel arch assemblies are connected together through the upper connecting assembly in a mode that one lower corrugated plate assembly is arranged in turn with one lower steel arch assembly;
and the opposite ends of the upper step assembly rigid supporting structure and the lower step assembly rigid supporting structure are connected to form an assembly rigid supporting structure of the whole tunnel inner wall.
2. The pre-stressed assembly tunnel supporting device according to claim 1, further comprising:
the temporary support frame is of a long strip-shaped structure, and a support surface for supporting the bottom end of the upper corrugated plate assembly and the bottom end of the upper steel arch assembly is arranged in the temporary support frame.
3. The pre-stressed assembly type tunnel supporting device as claimed in claim 2, wherein the temporary supporting frame is an elevation type temporary supporting frame provided with a height self-adjusting device, and the height of the temporary supporting frame can be adjusted by the height self-adjusting device.
4. A pre-stressed assembly tunnel supporting device according to any one of claims 1 to 3, wherein each upper corrugated plate assembly in the upper step-built rigid supporting structure comprises:
the corrugated plate temporary plugging block comprises a first sub-plate, a second sub-plate, a corrugated plate temporary plugging block and a corrugated plate connecting piece; wherein,
the temporary plugging blocks of the first sub-plate, the second sub-plate and the corrugated plate are arc-shaped structures, and the temporary plugging blocks of the first sub-plate, the second sub-plate and the corrugated plate can be assembled into semicircular structures after being connected through corrugated plate connecting pieces.
5. A pre-stressing assembly type tunnel supporting device according to any one of claims 1 to 3, wherein each upper steel arch assembly in said upper-step erection rigid supporting structure comprises:
the steel arch frame comprises a first sub frame, a second sub frame and a steel arch frame time blocking block and a steel arch frame connecting piece; wherein,
the first sub-frame, the second sub-frame and the temporary plugging blocks of the steel arch frame are all arc-shaped structures, and the first sub-frame, the second sub-frame and the temporary plugging blocks of the steel arch frame can be assembled into a semicircular structure after being connected through the steel arch frame connecting piece.
6. A pre-stressed assembly tunnel supporting device according to any one of claims 1 to 3, wherein each upper connecting assembly of the upper step assembly rigid supporting structure comprises:
a plurality of gaskets and a plurality of bolts; wherein,
and a plurality of sealing gaskets are arranged between the adjacent joints of the upper corrugated plate assembly and the upper steel arch assembly.
7. A pre-stressed assembly tunnel supporting device according to any one of claims 1 to 3, wherein each lower corrugated plate assembly in the lower step-built rigid supporting structure comprises:
the third sub-plate, the fourth sub-plate and the corrugated plate connecting piece; wherein,
the third sub-board and the fourth sub-board are both arc-shaped structures, and the third sub-board and the fourth sub-board can be connected through corrugated plate connecting pieces and then are assembled into the arc-shaped structures.
8. A pre-stressed assembly tunnel supporting device according to any one of claims 1 to 3, wherein each lower steel arch assembly in the lower step assembly rigid supporting structure comprises:
the third sub-frame, the fourth sub-frame and the steel arch frame connecting piece; wherein,
the third sub-frame and the fourth sub-frame are both arc-shaped structures, and the third sub-frame and the fourth sub-frame can be assembled into the arc-shaped structures after being connected through the steel arch connecting piece.
9. A pre-stressed assembly tunnel supporting device according to any one of claims 1 to 3,
in the rigid support structure is assembled to lower step, every lower coupling assembling includes:
a plurality of gaskets and a plurality of bolts; wherein,
and a plurality of sealing gaskets are arranged between the joints of the adjacent lower corrugated plate assemblies and the lower steel arch assembly.
10. A pre-stressed assembly tunnel supporting device according to any one of claims 1 to 3, wherein each lower corrugated plate assembly in the lower step-built rigid supporting structure comprises:
a third sub-board and a fourth sub-board; wherein,
the third sub-board and the fourth sub-board are both in a straight board structure, and are vertically arranged in a parallel structure separately;
in the rigid support structure is assembled to lower step, every lower steel bow member subassembly includes:
a third sub-frame and a fourth sub-frame; wherein,
the third sub-frame and the fourth sub-frame are both of straight plate structures, and are vertically arranged in parallel separately.
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| CN201820944345.6U CN208441875U (en) | 2018-06-19 | 2018-06-19 | One kind being able to achieve prestressed assembled tunnel support device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108547645A (en) * | 2018-06-19 | 2018-09-18 | 北京中地盾构工程技术研究院有限公司 | It is a kind of to realize prestressed assembled tunnel support device and method |
| CN116378677A (en) * | 2023-05-29 | 2023-07-04 | 湖南省交通规划勘察设计院有限公司 | Tunnel construction method and tunnel structure of full-span filling karst cave section |
-
2018
- 2018-06-19 CN CN201820944345.6U patent/CN208441875U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108547645A (en) * | 2018-06-19 | 2018-09-18 | 北京中地盾构工程技术研究院有限公司 | It is a kind of to realize prestressed assembled tunnel support device and method |
| CN108547645B (en) * | 2018-06-19 | 2024-03-19 | 北京中地盾构工程技术研究院有限公司 | Assembled tunnel supporting device and method capable of realizing prestress |
| CN116378677A (en) * | 2023-05-29 | 2023-07-04 | 湖南省交通规划勘察设计院有限公司 | Tunnel construction method and tunnel structure of full-span filling karst cave section |
| CN116378677B (en) * | 2023-05-29 | 2023-08-29 | 湖南省交通规划勘察设计院有限公司 | Tunnel construction method and tunnel structure of full-span filling karst cave section |
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