CN114293993B - Vertical deformation repairing structure for construction of up-and-down overlapped tunnel and construction method - Google Patents
Vertical deformation repairing structure for construction of up-and-down overlapped tunnel and construction method Download PDFInfo
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- CN114293993B CN114293993B CN202111497923.9A CN202111497923A CN114293993B CN 114293993 B CN114293993 B CN 114293993B CN 202111497923 A CN202111497923 A CN 202111497923A CN 114293993 B CN114293993 B CN 114293993B
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Abstract
The invention discloses a vertical deformation repairing structure for construction of an up-and-down overlapped tunnel and a construction method, wherein the vertical deformation repairing structure comprises the following steps: a rigid partition layer and a deformation repair layer; the rigid partition layer comprises rigid partition piles which are horizontally arranged at intervals in sequence, and the rigid partition piles intersect with the space of the newly-built tunnel at included angles; the deformation repairing layer comprises a bag expansion pipe group which is horizontally arranged at intervals in sequence, the bag expansion pipe group and the existing tunnel and the rigid blocking pile are respectively intersected in a space mode at an included angle, and the bag expansion pipe group is used for performing reverse correction on vertical deformation by expanding, deforming and extruding towards the vertical deformation side after grouting. The vertical deformation repairing structure and the construction method can safely and reliably repair the possible vertical deformation such as floating and sinking of the existing operating tunnel in the tunnel overlapping area, the deformation value after the treatment is within the safe operation allowable range, the structural stress increase caused by the deformation is avoided, the durability of the structure is enhanced, and the powerful guarantee is provided for the operation safety of the existing tunnel in the construction period of a newly-built tunnel.
Description
Technical Field
The invention relates to the technical field of rock and soil engineering and underground engineering, in particular to a vertical deformation repairing structure for construction of an up-down overlapped tunnel. In addition, the invention also relates to a construction method for constructing the vertical deformation repairing structure for the construction of the up-down overlapped tunnel.
Background
With the construction of urban rail transit, as long as 2020, the operating mileage of the existing subway in the whole country is 6400 kilometers, the mileage of the subway under construction exceeds 5000 kilometers, and in 2035 years, the national planning construction finishes the rail transit for more than 30000 kilometers, and a large number of municipal road tunnels are planned in each large city at the same time. Because the underground space resources of the shallow layer of the city are limited, along with the continuous construction of the subway, the situation that the newly-built tunnel is provided with an upper span/lower pass existing tunnel is more and more common, and the situation is the key point and the difficulty point of the control of the construction of various underground projects.
At present, the deformation control of the existing tunnel structure is mainly carried out in the construction of an upper span/lower pass existing tunnel of a newly built tunnel by adopting a method of enhancing the rigidity of the existing tunnel lining structure or reinforcing the surrounding stratum by adopting sleeve valve pipe grouting to form a large arch ring and the like. However, the deformation control capability of the above scheme is limited, the reinforcement range is not uniformly distributed, and convenience measures cannot be taken to correct tunnel deformation after the deformation of the existing structure exceeds the limit, so that the permanent deformation of the structure is generated, secondary stress is retained in the structure for a long time, and the durability and subsequent safe operation of the tunnel structure are affected.
Disclosure of Invention
The invention provides a vertical deformation repairing structure for construction of an up-and-down overlapped tunnel and a construction method, and aims to solve the technical problems that the deformation control capability is limited, the reinforcement range is not uniformly distributed, and convenience measures cannot be taken to correct tunnel deformation after the deformation of an existing tunnel structure exceeds the limit, so that the permanent deformation of the structure is generated.
The technical scheme adopted by the invention is as follows:
the utility model provides a vertical deformation of overlap tunnel construction restores structure from top to bottom lays in waiting newly-built new tunnel and the crossing upper and lower overlap region in existing tunnel, includes: the device comprises a rigid partition layer used as a counter-force supporting point and a deformation repairing layer used for reversely correcting vertical deformation; the rigid partition layer is arranged close to the newly-built tunnel and comprises rigid partition piles horizontally arranged at intervals in sequence, and the rigid partition piles and the newly-built tunnel space are intersected at included angles; the deformation repairing layer is arranged close to the existing tunnel and comprises a bag expansion pipe group which is horizontally arranged at intervals in sequence, the bag expansion pipe group and the existing tunnel and the rigid blocking pile are respectively intersected in a space mode at an included angle, and vertical deformation is reversely corrected by expansion deformation extrusion towards the vertical deformation side after grouting through the bag expansion pipe group.
Further, the deformation repairing layer is horizontally arranged, and the distance between the center of the deformation repairing layer and the existing tunnel is 1-2 m; the rigid partition layer is horizontally arranged, and the distance between the rigid partition layer and the deformation repairing layer is 1-2 m.
Further, a plurality of bag expansion pipe groups are uniformly distributed at intervals; or the bag expansion pipe groups are radially distributed, the reverse extension lines of the bag expansion pipe groups intersect at the same circle center, and the included angle of the central lines between two adjacent bag expansion pipe groups is 2-3 degrees.
Further, the bag expansion pipe group comprises rigid connecting piles which are arranged in an extending mode along the length direction of the bag expansion pipe group, and annular bags which are sequentially arranged at intervals along the length direction of the rigid connecting piles; the annular bag is wrapped on the outer circle of the rigid connecting pile, and a foaming expansion body which is formed by the reaction of grouting liquid and expands towards the vertical deformation side is filled in the annular bag.
Furthermore, a plurality of rigid partition piles are uniformly distributed at intervals; or a plurality of rigid separating piles are radially arranged, the reverse extension lines of the rigid separating piles intersect at the same circle center, and the included angle of the central line between every two adjacent rigid separating piles is 2-4 degrees.
Furthermore, the center distance between two adjacent rigid partition piles is 80-150 cm; the pile diameter of the rigid partition pile is 40 cm-80 cm.
Furthermore, the rigid partition layer is arranged in an overlapping influence area of the upper overlapping area and the lower overlapping area, the cross section of the overlapping influence area is in a parallelogram shape and is formed by intersecting two first partition boundary lines formed by respectively moving outwards two tunnel contour lines of an existing tunnel and two second partition boundary lines formed by respectively moving outwards two tunnel contour lines of a newly-built tunnel; the deformation repairing layer is arranged in a deformation influence area of the upper and lower overlapping areas, the cross section of the deformation influence area is parallelogram, and the deformation repairing layer is formed by intersecting two first repairing boundary lines formed by respectively inward moving of two tunnel contour lines of an existing tunnel and two second repairing boundary lines formed by respectively inward moving of two tunnel contour lines of a newly-built tunnel.
According to another aspect of the present invention, there is also provided a vertical deformation repairing construction method for an up-and-down overlapping tunnel construction, which is used for constructing any one of the above vertical deformation repairing structures for the up-and-down overlapping tunnel construction, and includes the following steps: determining an upper and lower overlapped area where the newly-built tunnel and the existing tunnel are intersected, and designing a drilling arrangement scheme of a rigid partition layer and a deformation repairing layer and an annular bag distribution scheme of the deformation repairing layer; determining a ground construction area and a drilling implementation point of the rigid partition layer and the deformation repairing layer; drilling and pouring to form each rigid partition pile of the rigid partition layer; drilling holes and constructing bag expansion pipe groups of the deformed repairing layer.
Further, the step of drilling and pouring to form each rigid partition pile of the rigid partition layer specifically comprises the following steps: drilling a first pile hole by adopting steerable drilling equipment, and carrying out rotary jet grouting on the first pile hole to form a first rigid partition pile; drilling a second pile hole by adopting steerable drilling equipment, and performing rotary jet grouting on the second pile hole to form a second rigid blocking pile; and repeating the steps until the forming of all rigid partition piles of the rigid partition layer is completed.
Further, the step of drilling and applying each bag expansion pipe group of the deformed repair layer specifically comprises the following steps: drilling a first borehole with steerable drilling equipment; sequentially arranging annular bags which are not subjected to grouting in the first drill hole through in-hole traction equipment; filling the first borehole with a cement slurry; repeating the steps in sequence until all the annular capsules of the deformation repairing layer are preset; the annular bladder is grouted.
The invention has the following beneficial effects:
the invention provides a vertical deformation repairing structure for construction of an up-and-down overlapped tunnel, which is characterized in that during construction, when a newly-built tunnel is penetrated downwards or strides over an existing tunnel, the existing tunnel can correspondingly generate sinking/floating vertical deformation, according to a deformation monitoring result, a plate foundation formed by a rigid partition layer is used as a counter-force supporting point, a second layer of deformation repairing layer is arranged, so that the existing tunnel is jacked or jacked towards the expansion deformation of the vertical deformation side of the existing tunnel after grouting through the deformation repairing layer, the sinking or floating deformation generated by the existing tunnel is corrected, structural secondary stress caused by deformation is eliminated, the deformation of the existing tunnel is controlled within a normal operation allowable range, and the tunnel structure and the operation safety are ensured; in addition, when the newly built tunnel is penetrated downwards/strides over the existing tunnel, due to the obstruction of the rigid partition layer, the stress change of the surrounding rock mass caused by the tunnel face construction of the newly built tunnel is obstructed under the rigid partition layer, and the stress environment of the rock-soil mass around the existing tunnel is not changed, so that the settlement or floating deformation of the existing tunnel caused by the construction of the newly built tunnel is effectively avoided; the vertical deformation repairing structure for the construction of the vertically-overlapped tunnel has the characteristics of high efficiency and practicability, can safely and reliably repair the vertical deformation such as floating, sinking and the like which possibly occurs in the existing operation tunnel in the tunnel overlapping area, and the deformation value after the vertical deformation repairing structure is positioned in the safe operation allowable range, so that the structural stress increase caused by the deformation is avoided, and the durability of the structure is enhanced;
when the construction method is adopted to construct the vertical deformation repair structure for the up-and-down overlapped tunnel construction, the construction operation is simple and easy to implement; the constructed rigid partition layer forms a plate foundation as a counter-force supporting point, and the deformation repairing layer jacks or presses the existing tunnel towards the expansion deformation of the vertical deformation side of the existing tunnel after grouting, so that the settlement or floating deformation generated by the existing tunnel is corrected, the structural secondary stress caused by deformation is eliminated, the deformation of the existing tunnel is controlled within the normal operation allowable range, and the tunnel structure and operation safety are ensured; in addition, due to the obstruction of the rigid partition layer, the stress change of the surrounding rock mass caused by the construction of the tunnel face of the newly-built tunnel is obstructed under the rigid partition layer, and the stress environment of the rock mass around the existing tunnel is not changed, so that the settlement or floating deformation of the existing tunnel caused by the construction of the newly-built tunnel is effectively avoided; the constructed vertical deformation repairing structure for the up-and-down overlapped tunnel construction has the characteristics of high efficiency and practicability, can safely and reliably repair the vertical deformation such as floating, sinking and the like possibly occurring in the existing operation tunnel in the overlapped area of the tunnel, and the deformation value after the vertical deformation is positioned in the safe operation allowable range, thereby avoiding the increase of the structural stress caused by the deformation and enhancing the durability of the structure.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a diagram of the arrangement of the overlapping regions of influence above and below a tunnel;
fig. 2 is a diagram of a rigid partition layer arrangement region;
FIG. 3 is a diagram of a deformed repair layer layout area;
FIG. 4 is a layout of a rigid partition layer in combination with a deformation repair layer;
FIG. 5 is a first space layout diagram of the deformation of the existing tunnel by expansion of the deformation repair layer and the bag;
FIG. 6 is a second layout of the space for deformation of the existing tunnel by expansion of the deformation repair layer and the bag;
FIG. 7 is a drill floor plan view of a rigid partition layer and a deformed repair layer;
FIG. 8 is a view of an embodiment of vertical deformation repair in the construction of an up-and-down overlapped tunnel.
Description of the drawings
10. Building a tunnel; 20. a rigid partition layer; 21. a rigid partition pile; 30. a deformation repair layer; 31. a bladder inflation tube set; 311. rigidly connecting the piles; 312. an annular bladder; 313. a foamed expansion body; 40. an existing tunnel; 50. an overlapping area of influence; 51. a first partition boundary line; 52. a second partition boundary line; 60. a deformation-affected zone; 61. a first repair boundary; 62. a second repair boundary; 70. overlapping the affected zone.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
Referring to fig. 1, 5 and 6, a preferred embodiment of the present invention provides an up-and-down overlapping tunnel construction vertical deformation repair structure, which is arranged in an up-and-down overlapping area where a newly-built tunnel 10 to be newly built and an existing tunnel 40 intersect, and includes: a rigid partition layer 20 used as a reaction force supporting point, and a deformation repair layer 30 used for reverse correction of vertical deformation; the rigid partition layer 20 is arranged close to the newly-built tunnel 10 and comprises rigid partition piles 21 horizontally arranged at intervals in sequence, and the rigid partition piles 21 are intersected with the space of the newly-built tunnel 10 at included angles; the deformation repairing layer 30 is arranged close to the existing tunnel 40 and comprises a bag expansion pipe group 31 which is horizontally arranged at intervals in sequence, the bag expansion pipe group 31 is spatially intersected with the existing tunnel 40 and the rigid blocking pile 21 at included angles respectively, and vertical deformation is reversely corrected by expansion deformation extrusion towards the vertical deformation side after grouting through the bag expansion pipe group 31.
The invention has proposed a vertical deformation of overlapping tunnel construction from top to bottom and repaired the structure, while constructing, when newly-built tunnel 10 is worn/strides the existing tunnel 40 from bottom to top, the existing tunnel 40 will produce the vertical deformation sinking/floating up correspondingly, according to the monitoring result of deformation, utilize "plate type foundation" that the rigid partition layer 20 forms to make the counter-force support point, set up the second layer deformation to repair the layer 30, in order to repair the layer 30 and lift up or jack-press the existing tunnel 40 towards the expansion deformation of the vertical deformation side of the existing tunnel 40 after slip casting through the deformation, thus revise the settlement or floating up deformation that the existing tunnel 40 produces, and dispel the structural secondary stress caused by deformation, control the deformation of the existing tunnel 40 in the normal operation allowable range, guarantee tunnel structure and operation safety; in addition, when the newly built tunnel 10 is underpass/overpass the existing tunnel 40, due to the obstruction of the rigid partition layer 20, the stress change of the surrounding rock mass caused by the construction of the tunnel face of the newly built tunnel 10 is obstructed under the rigid partition layer, and the stress environment of the rock-soil mass around the existing tunnel 40 is not changed, so that the settlement or the floating deformation of the existing tunnel 40 caused by the construction of the newly built tunnel 10 is effectively avoided; the vertical deformation repairing structure for the construction of the vertically-overlapped tunnel has the characteristics of high efficiency and practicability, can safely and reliably repair the vertical deformation such as floating, sinking and the like which possibly occurs in the existing operation tunnel in the tunnel overlapping area, and the deformation value after the vertical deformation repairing structure is positioned in the safe operation allowable range, so that the structural stress increase caused by the deformation is avoided, and the durability of the structure is enhanced.
Alternatively, as shown in fig. 5 and 6, the deformed repair layer 30 is horizontally arranged, and the distance between the center of the deformed repair layer and the existing tunnel 40 is 1m to 2m. When the distance between the center of the deformed repair layer 30 and the existing tunnel 40 is less than 1m, the expansion deformation of the bladder expansion pipe group 31 is affected, and the expansion of the bladder expansion pipe group 31 may have an effect on the stability of the existing tunnel 40; when the distance between the center of the deformed repair layer 30 and the existing tunnel 40 is more than 2m, the reverse correction effect of the balloon inflation tube group 31 on the existing tunnel 40 may be weakened.
Alternatively, as shown in fig. 5 and 6, the rigid partition layer 20 is horizontally arranged, and the distance between the rigid partition layer and the deformation repair layer 30 is 1m to 2m. In practical application, the distance between the central lines of the two drill holes of the rigid partition layer 20 and the deformation repairing layer 30 is not more than 1.0m, so as to fully exert the supporting function of the rigid partition layer 20, enhance the supporting effect, and enable the bag expansion pipe group 31 to expand and deform towards the vertical deformation side of the existing tunnel 40 as much as possible after liquid filling.
In this alternative, the first arrangement of the plurality of bladder expansion tube groups 31, not shown, is such that the plurality of bladder expansion tube groups 31 are arranged at regular intervals. The structural arrangement mode of the plurality of bag expansion pipe groups 31 enables the integral extrusion effect to be more uniform, and further improves the vertical deformation repair capability and the deformation repair effect of the existing tunnel 40.
In this alternative, the second arrangement of the plurality of bladder expansion tube groups 31 is, as shown in fig. 4 and 7, such that the plurality of bladder expansion tube groups 31 are radially arranged and the opposite extensions of the plurality of bladder expansion tube groups 31 intersect at the same center O 2 The included angle of the central lines between two adjacent bag expansion pipe groups 31 is 2-3 degrees. Because the bag expansion pipe group 31 extends and is arranged along the horizontal direction, the hole drilling needs to be carried out by adopting steerable drilling equipment during the hole drilling, the hole is drilled downwards at first, then the hole drilling is gradually changed into the horizontal hole drilling, and in order to reduce the drilling difficulty, the occupied area required by the bag expansion pipe group 31 for drilling is small.
Alternatively, as shown in fig. 5 and 6, the bladder expansion tube set 31 includes rigid connection piles 311 arranged to extend in the length direction thereof, and annular bladders 312 arranged at intervals in sequence in the length direction of the rigid connection piles 311; in the alternative, the rigid connection pile 311 is formed by pouring quick-setting cement slurry with high setting speed, and the construction is simple, time-saving and labor-saving. The annular bag 312 is attached to the outer circumference of the rigid connection post 311, and the annular bag 312 is filled with a foamed expansion body 313 formed by the reaction of the grouting liquid and expanding toward the vertical deformation side. During operation, according to the deformation condition of the existing tunnel 40, slurry with high expansion characteristic is poured into the annular bag 312 through the bag grouting pipe, and the vertical deformation side of the existing tunnel 40 is lifted or pressed by the expansion of the annular bag 312, so that the deformation correction of the existing tunnel 40 is realized. In the alternative, the annular bag is a bag commonly used in the existing construction, and the slurry is also commonly used in the existing construction.
In this alternative, as shown in fig. 5 and 6, the centers of the holes drilled in the adjacent two bladder-expansion tube groups 31 are spaced from each other by 0.8m to 1.2m. When the bag expansion pipe group 31 is constructed, holes need to be drilled firstly, then the annular bags 312 are distributed in the drilled holes at intervals, and finally the cement mortar is poured and formed, so that the central distance between the drilled holes of two adjacent bag expansion pipe groups 31 is not smaller than 80cm in order to avoid the influence on the adjacent bag expansion pipe groups 31 during drilling; meanwhile, in order to enhance the overall expansion and extrusion capacity of the deformation repairing layer 30, the center-to-center distance between the drill holes of the two adjacent bag expansion pipe groups 31 is not more than 120cm.
In this alternative, the plurality of rigid partition piles 21 are uniformly arranged at intervals in the first arrangement manner of the plurality of rigid partition piles 21, which is not shown. The structural arrangement mode of the rigid partition piles 21 enables the overall structural strength to be more uniform, and further improves the supporting effect.
In this alternative, as shown in fig. 4 and 7, the second arrangement of the rigid partition piles 21 is that the rigid partition piles 21 are radially arranged, and opposite extension lines of the rigid partition piles 21 intersect at the same center O 1 And the included angle of the center line between two adjacent rigid partition piles 21 is 2-4 degrees. Due to rigidityThe partition piles 21 extend in the horizontal direction, so that when drilling is needed, steerable drilling equipment needs to be used for drilling, the drilling is performed downwards at first, then the drilling is gradually inclined to form horizontal drilling, and in order to reduce the drilling difficulty, the occupied area for drilling the rigid partition piles 21 is small.
In the alternative, as shown in fig. 5, the center-to-center distance between two adjacent rigid partition piles 21 is 80cm to 150cm. When the rigid blocking piles 21 are constructed, drilling is firstly carried out, and then cement mortar is injected and molded, so that the central distance between every two adjacent rigid blocking piles 21 is not smaller than 80cm in order to avoid the influence on the adjacent rigid blocking piles 21 during drilling; meanwhile, in order to enhance the overall structural strength and the supporting strength of the rigid partition layer 20, the center-to-center distance between two adjacent rigid partition piles 21 is not larger than 150cm. In the alternative, the rigid partition pile 21 is a jet grouting pile formed by pouring polymer epoxy resin composite mortar, and the diameter of the jet grouting pile is 40-80 cm. The mortar used by the pile body of the jet grouting pile adopts polymer epoxy resin combined mortar with high breaking strength, so that the bearing capacity of the rigid partition layer for resisting deformation of the rock and soil body is enhanced.
Alternatively, as shown in fig. 1 and fig. 2, the rigid partition layer 20 is disposed in the overlapping influence area 50 of the upper and lower overlapping areas, the cross section of the overlapping influence area 50 is a parallelogram formed by intersecting two first partition boundary lines 51 formed by respectively moving outward two tunnel contour lines of the existing tunnel 40 and two second partition boundary lines 52 formed by respectively moving outward two tunnel contour lines of the newly-built tunnel 10. In this alternative, as shown in fig. 2, two tunnel contour lines of the existing tunnel 40 move outward by 1m to 3m respectively to form two first partition boundary lines 51, and two tunnel contour lines of the newly-built tunnel 10 move outward by 1m to 3m respectively to form two second partition boundary lines 52, even if the upper and lower overlapping influence areas 70 formed by overlapping the upper and lower tunnels extend outward to form the overlapping influence area 50, thereby increasing the layout area of the vertical deformation repair structure, improving the partition effect, effectively avoiding the sedimentation or floating deformation of the existing tunnel 40 caused by the construction of the newly-built tunnel 10, and further ensuring the normal operation of the existing tunnel 40, and ensuring the tunnel structure and operation safety.
Alternatively, as shown in fig. 1 and 3, the deformation repair layer 30 is disposed in the deformation affecting zone 60 of the upper and lower overlapping regions, and the cross section of the deformation affecting zone 60 is a parallelogram formed by intersecting two first repair boundary lines 61 formed by two tunnel contour lines of the existing tunnel 40 moving inwards respectively and two second repair boundary lines 62 formed by two tunnel contour lines of the newly-built tunnel 10 moving inwards respectively. In this alternative, as shown in fig. 3, two tunnel contour lines of the existing tunnel 40 are respectively moved inward by 0.8 to 1.2m to form two first repair boundary lines 61, and two tunnel contour lines of the newly-built tunnel 10 are respectively moved inward by 0.8 to 1.2m to form two second repair boundary lines 62, even if the upper and lower overlapping influence regions 70 formed by overlapping the upper and lower tunnels are contracted inward to form the deformation influence region 60, the arrangement area of the vertical deformation repair structure is reduced, the repair effect is ensured, and the construction cost and the construction workload are reduced.
Referring to fig. 5 to 8, a preferred embodiment of the present invention further provides a vertical deformation repair construction method for an up-and-down overlapping tunnel construction, which is used for constructing any one of the vertical deformation repair structures for an up-and-down overlapping tunnel construction, and includes the following steps:
determining an upper and lower overlapped area where the newly-built tunnel 10 is intersected with the existing tunnel 40, and designing a drilling arrangement scheme of the rigid partition layer 20 and the deformation repairing layer 30 and an annular bag 312 distribution scheme of the deformation repairing layer 30;
determining a ground construction area and a drilling implementation point of the rigid partition layer 20 and the deformation repairing layer 30;
drilling and pouring to form each rigid partition pile 21 of the rigid partition layer 20;
a hole is drilled and each bladder expansion tube set 31 of deformed repair layer 30 is applied.
When the construction method is adopted to construct the vertical deformation repair structure for the up-and-down overlapped tunnel construction, the construction operation is simple and easy to implement; the constructed rigid partition layer 20 forms a 'plate foundation' as a counter-force supporting point, so that the existing tunnel 40 is jacked or jacked through expansion deformation of the deformation repairing layer 30 towards the vertical deformation side of the existing tunnel 40 after grouting, the settlement or floating deformation generated by the existing tunnel 40 is corrected, the structural secondary stress caused by deformation is eliminated, the deformation of the existing tunnel 40 is controlled within a normal operation allowable range, and the tunnel structure and operation safety are ensured; in addition, due to the obstruction of the rigid isolating layer 20, the stress change of the surrounding rock mass caused by the construction of the tunnel face of the newly-built tunnel 10 is obstructed below the rigid isolating layer, and the stress environment of the rock mass around the existing tunnel 40 is not changed, so that the settlement or floating deformation of the existing tunnel 40 caused by the construction of the newly-built tunnel 10 is effectively avoided; the constructed vertical deformation repairing structure for the up-and-down overlapped tunnel construction has the characteristics of high efficiency and practicability, can safely and reliably repair the vertical deformation such as floating, sinking and the like possibly occurring in the existing operation tunnel in the overlapped area of the tunnel, and the deformation value after the vertical deformation is positioned in the safe operation allowable range, thereby avoiding the increase of the structural stress caused by the deformation and enhancing the durability of the structure.
Optionally, when an up-down overlapping area between the newly-built tunnel 10 and the existing tunnel 40 is determined, according to parameters such as the size, the overlapping angle θ, the vertical clear distance between the newly-built tunnel 10 and the existing tunnel 40, the drilling arrangement scheme of the rigid partition layer 20 and the deformed repair layer 30 and the distribution scheme of the annular bag 312 of the deformed repair layer 30 are designed, so that the drilling arrangement scheme of the rigid partition layer 20 and the deformed repair layer 30 is combined with the actual situation, the rationality of the constructed vertical deformed repair structure is further improved, and the action effect of the vertical deformed repair structure is improved.
Optionally, when the ground construction area and the drilling implementation point of the rigid partition layer 20 and the deformation repair layer 30 are determined, the determination is performed according to the mechanical parameters of the steerable drilling equipment and the environmental conditions around the project, so that the construction of the rigid partition layer 20 and the deformation repair layer 30 is combined with the actual situation, the construction difficulty is further reduced, and the construction efficiency is improved.
Optionally, the step of drilling and casting each rigid partition pile 21 of the rigid partition layer 20 includes the following steps:
drilling a first pile hole by adopting steerable drilling equipment, and performing rotary jet grouting on the first pile hole to form a first rigid blocking pile 21;
drilling a second pile hole by adopting steerable drilling equipment, and performing rotary jet grouting on the second pile hole to form a second rigid blocking pile 21;
and so on until the formation of all the rigid partition piles 21 of the rigid partition layer 20 is completed.
Specifically, a rigid isolation layer pile hole is drilled, a large-diameter horizontal jet grouting pile (namely a rigid separation pile 21) is formed in the range of an overlapping influence area 50 through a high-pressure jet grouting technology, the jet grouting pile is implemented at intervals after initial setting of cement paste, namely the jet grouting pile is divided into 1 st, 2 nd, 3 rd, 8230, and n (n is an even number) which are sequentially arranged, and then construction is carried out according to the sequence of the 1 st, the 3 rd, the 5 th, the 8230, the n-1 st, the 2 nd, the 4 th, the 6 th, the 8230, the 8230and the n. The outer side of the rigid isolation layer area can be filled with the quick-setting cement paste to form a drill hole, so that subsequent drilling construction is prevented from being influenced. When the rigid partition layer 20 is constructed by adopting the construction steps, the influence of the construction of the rigid partition layer 20 on surrounding rock-soil bodies and the surrounding environment of projects can be effectively reduced, the construction safety is improved, and the normal operation of the existing tunnel 40 is not influenced.
Optionally, the step "drilling and applying each bladder expansion tube set 31 of the deformed repair layer 30" comprises in particular the steps of:
drilling a first borehole with steerable drilling equipment;
arranging annular bags 312 which are not grouted in the first drill hole in sequence through an in-hole traction device;
filling the first borehole with a cement slurry;
repeating the above steps in sequence until all the annular pockets 312 of the deformation repair layer 30 are preset;
the annular bladder 312 is grouted.
Specifically, after the construction of the rigid partition layer is finished, drilling construction of a deformation repair layer is carried out on the side close to the existing tunnel, after the drilling is finished, an inner hollow annular belt-shaped rubber bag (namely an annular bag 312) with a grouting pipe is preset at a preset position through an in-hole traction device, after the prefabrication of the annular bag 312 of the hole is finished, the drilled hole is rapidly filled with quick-setting cement slurry to form a cement mortar pile body with an annular wrapping pile, and the grouting pipe of each bag is marked with a bag position; after the deformation repairing layer annular bag is completely preset, bag grouting tests are carried out in batches by reserving grouting pipes, and a bag grouting scheme is adjusted by combining deformation monitoring results, so that the deformation of the existing tunnel 40 is finally recovered to the allowable range of safe operation. Along with the propulsion of construction, deformation may be repeatedly generated at different positions, and then the deformation repair in different times is realized through the pre-buried bag, guarantees that the vertical deformation of existing tunnel is in the allowed range, guarantees the safe operation of existing tunnel.
Optionally, in the drilling construction of the rigid partition layer 20 and the deformation repair layer 30, drilling signal source devices are respectively arranged in a drilling path and an upper and lower overlapping area, so that the direction and depth of drilling are ensured, and hole string is avoided. When the drilling operation is carried out, the drilling equipment capable of steering is used for drilling in a vertical direction and a horizontal direction, and due to the fact that the drilling is dense, drilling signal source devices are required to be arranged in a drilling path and an upper and lower overlapping area of each hole respectively so as to control the direction and the depth of the drilling.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a vertical deformation of upper and lower overlap tunnel construction repairs structure, its characterized in that lays in the crossing upper and lower overlap region of waiting newly-built new tunnel (10) and existing tunnel (40), includes:
a rigid blocking layer (20) used as a counter force supporting point and a deformation repairing layer (30) used for reversely correcting vertical deformation;
the rigid partition layer (20) is arranged close to the newly-built tunnel (10) and comprises rigid partition piles (21) horizontally arranged at intervals in sequence, and the rigid partition piles (21) are intersected with the space of the newly-built tunnel (10) at included angles;
the deformation repairing layer (30) is arranged close to the existing tunnel (40) and comprises a bag expansion pipe group (31) which is horizontally arranged at intervals in sequence, the bag expansion pipe group (31) is spatially intersected with the existing tunnel (40) and the rigid blocking pile (21) at an included angle respectively, and the vertical deformation is reversely corrected by expansion deformation extrusion towards the vertical deformation side after grouting through the bag expansion pipe group (31);
during construction, when a newly built tunnel (10) is threaded downwards/strides over an existing tunnel (40), the existing tunnel (40) can correspondingly generate sinking/floating vertical deformation, according to a deformation monitoring result, a plate type foundation formed by a rigid partition layer (20) is used as a counter force supporting point, a deformation repairing layer (30) is arranged, so that the existing tunnel (40) is jacked or jacked through expansion deformation of the deformation repairing layer (30) towards the vertical deformation side of the existing tunnel (40) after grouting, the sinking or floating deformation generated by the existing tunnel (40) is corrected, and structural secondary stress caused by deformation is eliminated;
the deformation repairing layer (30) is horizontally arranged, and the distance between the center of the deformation repairing layer and the existing tunnel (40) is 1-2 m; the rigid partition layer (20) is horizontally arranged, and the distance between the rigid partition layer and the deformation repairing layer (30) is 1-2 m;
the rigid partition layer (20) is arranged in an overlapping influence area (50) of the upper and lower overlapping areas, the cross section of the overlapping influence area (50) is parallelogram, and the rigid partition layer is formed by intersecting two first partition boundary lines (51) formed by respectively outwards moving two tunnel contour lines of the existing tunnel (40) and two second partition boundary lines (52) formed by respectively outwards moving two tunnel contour lines of the newly-built tunnel (10); the deformation repairing layer (30) is arranged in a deformation influence area (60) of the upper and lower overlapping areas, the cross section of the deformation influence area (60) is parallelogram, and two first repairing boundary lines (61) formed by inward movement of two tunnel contour lines of the existing tunnel (40) and two second repairing boundary lines (62) formed by inward movement of two tunnel contour lines of the newly-built tunnel (10) are intersected to form the deformation repairing layer.
2. The vertically-deforming restoring structure for upper and lower overlapping tunnel construction according to claim 1,
a plurality of the bag expansion pipe groups (31) are arranged at uniform intervals; or
The bag expansion pipe groups (31) are radially distributed, the reverse extension lines of the bag expansion pipe groups (31) intersect at the same circle center, and the included angle of the center lines between two adjacent bag expansion pipe groups (31) is 2-3 degrees.
3. The vertically-overlapped tunnel construction vertical deformation repair structure according to claim 1,
the bag expansion pipe group (31) comprises rigid connecting piles (311) extending along the length direction of the bag expansion pipe group, and annular bags (312) arranged at intervals along the length direction of the rigid connecting piles (311);
the annular bag (312) is attached to the outer circle of the rigid connecting pile (311), and a foaming expansion body (313) which is formed by the reaction of grouting liquid and expands towards the vertical deformation side is filled in the annular bag (312).
4. The vertically-deforming restoring structure for upper and lower overlapping tunnel construction according to claim 1,
the rigid partition piles (21) are uniformly distributed at intervals; or
The rigid blocking piles (21) are radially arranged, reverse extension lines of the rigid blocking piles (21) intersect at the same circle center, and the included angle of the center line between every two adjacent rigid blocking piles (21) is 2-4 degrees.
5. The vertically-deforming restoring structure for upper and lower overlapping tunnel construction according to claim 1,
the central distance between two adjacent rigid partition piles (21) is 80-150 cm;
the pile diameter of the rigid partition pile (21) is 40-80 cm.
6. A vertical deformation repairing construction method for construction of an up-and-down overlapped tunnel is characterized by being used for constructing the vertical deformation repairing structure for the up-and-down overlapped tunnel construction according to any one of claims 1-5, and comprising the following steps of:
determining an upper and lower overlapped area where the newly-built tunnel (10) is intersected with the existing tunnel (40), and designing a drilling arrangement scheme of the rigid partition layer (20) and the deformed repairing layer (30) and a distribution scheme of annular bag bags (312) of the deformed repairing layer (30);
determining a ground construction area and a drilling implementation point of the rigid partition layer (20) and the deformation repairing layer (30);
drilling and pouring to form each rigid partition pile (21) of the rigid partition layer (20);
each bladder expansion tube set (31) is drilled and applied with a deformed repair layer (30).
7. The vertical deformation repairing construction method for the construction of the up-and-down overlapped tunnel according to claim 6, wherein the step of drilling and pouring each rigid partition pile (21) of the rigid partition layer (20) comprises the following steps:
drilling a first pile hole by adopting steerable drilling equipment, and performing rotary jet grouting on the first pile hole to form a first rigid blocking pile (21);
drilling a second pile hole by adopting steerable drilling equipment, and performing rotary jet grouting on the second pile hole to form a second rigid blocking pile (21);
and the rest is done until the forming of all rigid partition piles (21) of the rigid partition layer (20) is finished.
8. The vertical deformation repair construction method for upper and lower overlapping tunnel construction according to claim 6, wherein the step of "drilling and applying each bag expansion pipe group (31) of the deformation repair layer (30)" comprises the following steps:
drilling a first borehole with steerable drilling equipment;
arranging annular bags (312) which are not grouted in the first drill hole in sequence through in-hole traction equipment;
filling the first borehole with a cement slurry;
the steps are sequentially repeated until all the annular sacks (312) of the deformation repairing layer (30) are preset;
the annular bladder (312) is grouted.
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