CN115853535A - Construction method for tunnel to penetrate through existing slide-resistant pile - Google Patents

Abstract

The invention discloses a construction method for a tunnel to pass through an existing anti-slide pile, which comprises the following steps of 1, burying displacement and inclination sensors at measuring points of the existing anti-slide pile section; step 2, measuring and positioning the position of the anti-slide pile in the hole; step 3, chiseling the anti-slide pile and erecting a support; step 4, spraying concrete to seal after the support is erected; step 5, digging out and finding out and shearing off the anchor cable; step 6, connecting the steel arch centering to enable the arch centering to support to form a closed loop; step 7, monitoring the settlement deformation inside and outside the hole; step 8, breaking the anti-slide piles at the lower part to the primary support bottom of the inverted arch step by step; the method finds out the position of the slide-resistant pile by adopting a method for excavating the tunnel layer by layer, effectively supports the tunnel by utilizing the steel arch frame, the steel connecting mechanism and the supporting mechanism, avoids the settlement deformation of the ground surface, the pile body, the side slope and the building at the position of the slide-resistant pile, ensures the stability of tunnel construction to the maximum extent, reduces economic loss and casualties, and has the characteristics of simple and convenient construction process, good supporting effect, reasonable design and convenient construction.

Description

Construction method for tunnel to penetrate through existing slide-resistant pile

Technical Field

The invention relates to the technical field of tunnel construction, in particular to a construction method for a tunnel to pass through an existing slide-resistant pile.

Background

With the rapid development of cities, more and more expressways, railways, subways and the like begin to be built in cities in order to meet the daily travel requirements of people; the method is characterized in that the tunnel usually avoids old landslide, faults, unstable rock mass and other sections according to actual conditions during route selection, and adopts the modes of changing routes, avoiding, deeply burying and the like, but with the increase of the tunnels, the tunnels inevitably pass through landslide zones, and in order to ensure the normal construction and operation of the tunnels, technical means of firstly rectifying the landslide and then building the tunnels and the like are usually adopted, so that the original pile foundation is usually damaged and protected in the subway tunnel construction process;

therefore, in the construction process, if the protection of the subway tunnel penetrating through the existing slide-resistant pile section is not proper, the normal use of the original building can be threatened in the tunnel construction process, even the safety of the original building is damaged, and great economic loss and casualties are caused;

in the construction process of a subway tunnel penetrating through an existing slide-resistant pile section, in order to ensure the normal use of an existing building and the normal construction of the tunnel and the subway, the foundation of the existing building is subjected to necessary treatment and foundation underpinning under the normal condition; the underpinning process is constrained by various objective conditions, the structural underpinning transformation is required to be carried out according to the specific conditions of the upper building structure, the construction requirement speed is high, the construction period is short, and the technical difficulty is relatively high; many unsafe factors exist in the influence of the underground environment and the upper building, and the safety and the normal function of the existing building are not influenced on the basis; at present, different construction processes are adopted aiming at different conditions, measures such as a pile foundation underpinning method, a raft underpinning method, a pile girder underpinning method, a pile slab supporting method, a comprehensive construction method and the like can be selected, but the construction problem that a tunnel penetrates through an existing slide-resistant pile cannot be effectively solved;

therefore, a construction method for a tunnel to penetrate through an existing slide-resistant pile is needed to solve the problems in the prior art.

Disclosure of Invention

Aiming at the existing problems, the invention aims to provide a construction method for a tunnel to pass through the existing slide-resistant pile.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a construction method for a tunnel to pass through an existing slide-resistant pile comprises the following steps

Step 1, in the tunnel construction process, embedding displacement and inclination sensors at measuring points of the ground surface, the pile body, the side slope and the building settlement deformation pile point of the existing slide-resistant pile section;

step 2, measuring and positioning the position of the anti-slide pile in the tunnel in the tunneling process;

step 3, chiseling the anti-slide pile and erecting a support;

step 4, spraying concrete to seal after the support is erected, so that the support is integrally stressed;

step 5, digging out slots to find out and cut off the anchor cables;

step 6, connecting the steel arch centering to enable the arch centering to support to form a closed loop;

step 7, monitoring and recording the settlement deformation inside and outside the hole;

and 8, gradually breaking the anti-slide piles at the lower part to the primary support bottom of the inverted arch.

Preferably, the process for measuring and positioning the position of the slide pile in the hole in the step 2 comprises

Step 2.1, adopting a pilot tunnel on the foundation pit to tunnel to the existing anti-slide pile, and measuring the position of the anti-slide pile;

step 2.2, finding out the position and the shape of the existing slide-resistant pile by adopting a manual cut tunneling mode;

and 2.3, completely digging out the anti-slide pile in the rock soil along the pile position by using a digging machine, and measuring the pile shearing elevation.

Preferably, the process of drilling the anti-slide pile and erecting the support in step 3 comprises

3.1 chiseling concrete of the slide-resistant pile along the direction of the primary support surface of the tunnel, mechanically cutting reinforcing steel bars in the concrete of the original slide-resistant pile, and chiseling the slide-resistant pile;

step 3.2, installing an arch section of a steel arch at the arch section position of the chisel section of the anti-slide pile, and welding a steel connecting mechanism on the upper side of the steel arch at the chisel section of the anti-slide pile to be connected with the chisel section of the anti-slide pile at the upper part to form a first safety barrier;

3.3, arranging a supporting mechanism corresponding to the position of the tool steel connecting mechanism at the lower side of the steel arch frame at the chisel section of the anti-slide pile to be connected with the lower-end anti-slide pile section to form a second safety barrier;

step 3.4, drilling holes at the lower ends of the anti-slide piles at the upper parts of the steel arches and installing a tunnel portal large pipe shed, so that the front of the tunnel portal large pipe shed enters a rock stratum on the top side of the tunnel to form a cantilever beam structure;

and 3.5, after the excavation of the inverted arch part of the tunnel is finished, installing a steel round pipe between two arch feet at the bottom of the steel arch frame to form a fourth safety barrier.

Preferably, the I-steel connecting mechanism comprises a first I-steel connecting piece, a second I-steel connecting piece and a positioning bolt,

the first I-steel connecting piece comprises an I-steel connecting block and a first I-steel base, and the I-steel connecting block is arranged on the section of the lower end of the upper anti-slide pile;

the second I-steel connecting piece comprises a second I-steel base and a connecting plug board, the second I-steel base is fixedly arranged on the upper side of the steel arch frame, and the connecting plug board is arranged on the second I-steel base and is matched with the I-steel connecting block;

the positioning bolt is arranged between the first I-steel connecting piece and the second I-steel connecting piece and is matched with the positioning nut for use.

Preferably, a web plate is integrally formed between the two baffle plates of the I-steel connecting block, a slot is formed between the baffle plates, and the slot is matched with the connecting inserting plate for use; and the web plate and the connecting plug board are both provided with adjusting grooves, and positioning clamping grooves are also arranged in the adjusting grooves and are matched with positioning bolts for use.

Preferably, the supporting mechanism comprises a mounting bottom plate, a telescopic cylinder, a telescopic rod and a top plate,

the installation bottom plate is arranged at the bottom of the telescopic cylinder and is connected with a positioning steel plate welded on the upper end face of the lower anti-slide pile;

the telescopic cylinder is arranged at the upper end of the mounting bottom plate, and an adjusting assembly is arranged in the telescopic cylinder;

the telescopic rod is movably arranged in the telescopic cylinder and is matched with the adjusting component for use;

the top plate is arranged at the end part of the telescopic rod, a clamping block is arranged on the lower side of the top plate and matched with a clamping groove formed in the telescopic rod, and a positioning hole is formed in the clamping groove and matched with the positioning pin.

Preferably, the adjusting assembly comprises an adjusting handle and an adjusting rod,

the adjusting handle is arranged at the lower end of the telescopic cylinder, a handle rod of the adjusting handle is rotationally connected with the side wall of the telescopic cylinder through a first bearing, and a first gear is arranged at the end part of the handle rod;

the adjusting rod is arranged in the inner cavity of the telescopic cylinder through a second bearing, a second gear is arranged at the lower end of the adjusting rod and is meshed with the first gear, a positioning ring is further arranged on the outer side of the telescopic rod, and the positioning ring is matched with a positioning cavity arranged in the inner cavity of the telescopic cylinder; the telescopic rod is also internally provided with a screw joint cavity, and the inner wall of the screw joint cavity is provided with an internal thread which is matched with an external thread arranged on the adjusting rod.

Preferably, step 3.2 the arch section of steel bow member adopt the mounting means construction of assembling from top to bottom in proper order, and after the pilot tunnel excavation is finished on the foundation ditch, set up arch section supporting seat at arch section downside and support the arch section for the effort of arch section can be used in the pilot tunnel bottom.

Preferably, the arch section supporting seat comprises a frame body connecting plate and an arch section connecting plate,

the support body connecting plate is arranged on the lower side of the arch section connecting plate and is matched with the bottom of the support body or the guide pit for use, a support assembly and a support seat positioning assembly are arranged on the support body connecting plate, and the support seat positioning assembly is matched with a positioning anchor rod anchored into a tunnel side wall rock mass for use;

the arch section connecting plate is arranged on the upper side of the frame body connecting plate through the supporting assembly and is connected with the steel arch frame arch section; the support assembly comprises an adjusting sleeve, a hinge connecting piece and a hinge base, and the hinge base is arranged on the frame body connecting plate and the arch section connecting plate; the hinged connecting piece is rotatably connected with the hinged base; the adjusting sleeve is arranged between the two hinged connecting pieces, and internal threads with opposite screwing directions are arranged in the adjusting sleeve and are in screwed connection with screw connecting rods arranged on the hinged connecting pieces.

Preferably, the supporting seat positioning assembly comprises a hydraulic cylinder and a telescopic positioning steel piece,

the hydraulic cylinder is arranged on the frame body connecting plate through a hydraulic cylinder positioning steel plate, and a moving steel plate is arranged at the end part of a piston rod of the hydraulic cylinder;

the telescopic positioning steel piece is arranged on the frame body connecting plate through a guide piece and is connected with the movable steel plate through a connecting steel plate, and an anchor rod positioning steel plate is arranged at the front end of the telescopic positioning steel piece and is matched with a positioning anchor rod for use;

the guide part comprises a guide bottom plate and steel part positioning steel plates, the guide bottom plate is fixedly arranged on the frame body connecting plate, the steel part positioning steel plates are symmetrically arranged on the guide bottom plate, and a guide groove is formed between the two steel part positioning steel plates which are symmetrically arranged and is matched with the telescopic positioning steel part for use.

The invention has the beneficial effects that: the invention discloses a construction method for a tunnel to pass through an existing slide-resistant pile, which is improved in the following points compared with the prior art:

1. the invention designs a construction method for a tunnel to pass through an existing anti-slide pile, the method finds out the position of the anti-slide pile by adopting a method for excavating the tunnel layer by layer, and forms a supporting system by utilizing a steel arch frame, an I-steel connecting mechanism and a supporting mechanism, thereby effectively completing the support of the tunnel, avoiding the settlement deformation of the earth surface, a pile body, a side slope and a building at the position of the anti-slide pile, ensuring the stability of tunnel construction to the maximum extent, reducing economic loss and casualties, and having the advantages of simple and convenient construction process, good supporting effect, reasonable design and convenient construction;

2. according to the method, through the arrangement of the I-steel connecting mechanism, the supporting mechanism, the steel arch frame and the steel round pipe, during construction, the I-steel connecting mechanism and the steel arch frame form a first safety barrier, the supporting mechanism, the lower anti-slide pile, the I-steel connecting mechanism and the steel arch frame form a second safety barrier, the large pipe shed and the steel arch frame form a third safety barrier, the steel arch frame and the steel round pipe form a fourth safety barrier to support the upper anti-slide pile, and the strength, the supporting stability and the safety of a supporting system are effectively guaranteed;

3. meanwhile, when the anti-slide pile is used, the anti-slide pile on the upper portion of the steel arch frame can be supported by adjusting the relative dislocation position between the first I-steel connecting piece and the second I-steel connecting piece, and the application range of the I-steel connecting mechanism is effectively enlarged; the supporting of the multi-height steel arch frame workshop section is realized through the height adjustment of the supporting mechanism, and the supporting mechanism can be detached and recycled after being used, so that the construction cost is reduced;

4. according to the method, the arch section supporting seat is used for supporting the arch section of the steel arch frame, so that the acting force of the lower end of the arch section acts on the bottom of the pilot tunnel, the supporting effect of the steel arch frame is effectively guaranteed in the excavation process of the foundation pit, and the stability and the safety of the foundation pit are guaranteed.

Drawings

Fig. 1 is a construction process flow chart of the construction method for the tunnel to pass through the existing slide-resistant pile.

FIG. 2 is a flow chart of the safety evaluation of monitoring and measuring engineering in the construction process of the present invention.

FIG. 3 is a sectional view of the tunnel construction of the present invention.

Fig. 4 is a front view of the tunnel construction of the present invention.

Fig. 5 is a bottom view of the upper picket of the present invention.

Fig. 6 is a cross-sectional view of a tunnel stud segment of the present invention.

Fig. 7 is an exploded view of the inventive i-steel coupling mechanism.

FIG. 8 is a schematic structural diagram of a first I-steel connector of the present invention.

FIG. 9 is a schematic structural diagram of a second I-steel connector of the present invention.

Fig. 10 is a schematic structural diagram of the supporting mechanism of the present invention.

Fig. 11 is a cross-sectional view of the support mechanism of the present invention.

Fig. 12 is a schematic structural view of the telescopic rod of the present invention.

FIG. 13 is a schematic structural view of the arch support according to the present invention.

FIG. 14 is a schematic structural view of the support assembly of the present invention.

Fig. 15 is a schematic view of the construction of the hinge connector of the present invention.

Wherein: 1. anti-slide piles; 2. 21 parts of steel arch frames, 22 parts of frame body connecting plates, 22 parts of arch segment connecting plates, 23 parts of supporting components, 231 parts of adjusting sleeves, 232 parts of hinged connecting pieces, 2321 parts of threaded connecting rods, 233 parts of hinged bases, 24 parts of hydraulic cylinder positioning steel plates, 241 parts of reinforcing steel plates, 25 parts of hydraulic cylinders, 251 parts of moving steel plates, 252 parts of connecting steel plates, 26 parts of telescopic positioning steel members, 261 parts of guide bottom plates and 262 parts of steel member positioning steel plates; 3. the connecting structure comprises a I-steel connecting mechanism, 31, a first I-steel connecting piece, 311, an I-steel connecting block, 312, a web plate, 313, an inserting groove, 314, a first I-steel base, 315, a baffle plate, 32, a second I-steel connecting piece, 321, a second I-steel base, 322, a connecting inserting plate, 33, a positioning bolt, 34, a positioning nut, 35, an adjusting groove and 351, wherein the I-steel connecting mechanism is arranged on the connecting inserting plate; 4. the adjustable clamp comprises a supporting mechanism, 41, a mounting bottom plate, 42, a telescopic cylinder, 421, a positioning cavity, 43, a telescopic rod, 431, a bolt connection cavity, 432, a positioning ring, 433, a positioning hole, 434, a clamping groove, 44, a top plate, 441, a clamping block, 45, an adjusting handle, 451, a handle rod, 452, a first bearing, 453, a first gear, 46, an adjusting rod, 461, a second gear, 462, a second bearing and 47, a positioning pin; 5. the steel pipe, 6, big pipe shed, 7, anchor rope.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following further describes the technical solution of the present invention with reference to the drawings and the embodiments.

Example 1: referring to fig. 1-15, a method for constructing a tunnel through an existing slide-resistant pile includes

Step 1, in the tunnel construction process, embedding displacement and inclination sensors at measuring points at the positions of the ground surface, the pile body, the side slope, the building settlement deformation pile point and the like of the existing slide-resistant pile section, and measuring the deformation of the positions of the ground surface, the pile body, the side slope, the building settlement deformation pile point and the like of the slide-resistant pile section;

monitoring and measuring are important means for monitoring the stability of surrounding rocks and supports, and are main bases for judging whether design and construction are correct and reasonable; burying monitoring points in the ground surface, pile body, side slope and building settlement deformation pile points, performing initial measurement, and finishing data obtained by field observation in time after field measurement and data acquisition are completed in the subsequent process;

step 2, measuring and positioning the position of the anti-slide pile 1 in the tunnel in the tunneling process

Step 2.1, adopting a pilot tunnel on the foundation pit to tunnel to the existing anti-slide pile, and measuring the position of the anti-slide pile;

step 2.2, finding out the position and the shape of the existing slide-resistant pile by adopting a manual cut tunneling mode;

step 2.3, completely digging out the anti-slide pile in the rock soil along the pile position by using a digging machine, and measuring the elevation of the cut pile;

step 3, chiseling the anti-slide pile and erecting a support

Step 3.1, chiseling concrete of the anti-slide pile 1 manually along the direction of the primary support surface of the tunnel by using an air pick, and mechanically cutting reinforcing steel bars in the concrete of the original anti-slide pile to complete chiseling and breaking of the anti-slide pile 1;

step 3.2, secondly, installing a steel arch frame 2 at the arch section position of the chiseling section of the anti-slide pile 1, welding a tool steel connecting mechanism 3 on the upper side of the steel arch frame 2 at the chiseling section of the anti-slide pile to be connected with the chiseling section of the anti-slide pile at the upper part to form a first safety barrier, and supporting the anti-slide pile 1 at the upper part of the steel arch frame by utilizing the supporting action of the steel arch frame 2 and the tool steel connecting mechanism 3 when in use;

3.3, arranging a supporting mechanism 4 on the lower side of the steel arch 2 at the chiseling section of the anti-slide pile to be connected with the anti-slide pile at the lower end, wherein the supporting mechanism 4 corresponds to the tool steel connecting mechanism 3 in position one to form a second safety barrier, and supporting two chiseling sections at the chiseling section of the anti-slide pile by using the supporting action of the steel arch 2 and the supporting mechanism 4 when in use;

step 3.4, drilling a hole at the lower end of the slide-resistant pile at the upper part of the steel arch frame and installing a tunnel opening large pipe shed 6, so that the front of the tunnel opening large pipe shed enters a rock layer at the top side of the tunnel to form a cantilever beam structure which is used as a third safety barrier and forms a cantilever beam with the original slide-resistant pile 1 to support the original slide-resistant pile at the upper end of the steel arch frame;

step 3.5, after the excavation of the inverted arch part of the tunnel is finished, a steel round pipe 5 with the diameter phi of 800mm and the wall thickness of not less than 20mm is arranged between two arch feet at the bottom of the steel arch frame and used as a fourth safety barrier to avoid the steel arch frame from being stressed and deformed, so that the effect of temporarily supporting the anti-slide pile at the center of the arch frame is achieved;

step 4. Sealing sprayed concrete

Supporting the sheared upper-end anti-slide pile at the upper end of the primary support steel arch frame 2 by using an I-steel connecting mechanism 3, and spraying concrete to wrap the pile so as to enable the pile to be stressed integrally;

step 5, digging out and finding out and cutting off anchor cable 7

Step 5.1, strictly forbidding pile breaking of the excavator before primary support of the cut pile is not completed, strictly forbidding collision of the existing anti-slide pile when the small-sized machinery is cut, avoiding disturbance on the existing anti-slide pile and an original rock stratum, forbidding blasting, and finding out the position of an anchor cable at the rear end of the anti-slide pile;

step 5.2, after finding out the anti-slide pile reinforcing steel bars, cutting the anchor cables, and when cutting the existing anti-slide pile reinforcing steel bars and anchor cables, forbidding oxygen acetylene cutting and adopting mechanical cutting;

step 6. Steel arch frame connection

Step 6.1, the pile cutting section construction is closed to form a ring in time, so that the whole primary support of the tunnel is stressed, and the original anti-slide pile at the top of the tunnel is ensured to sink in a controllable range;

step 6.2, feeding one steel arch 2 in each cycle, welding 300mm of foot plates and arch tops of two adjacent steel arch 2 into a whole by adopting I-shaped steel of the same type, spraying concrete between the initial support arch and the cut anti-slide piles to be compact, filling C30 fine stone concrete into a gap behind the initial support arch and reducing the settlement deformation of the tunnel roof;

step 7. Monitoring the settlement and deformation inside and outside the hole

Settlement deformation of a tunnel roof, the ground surface, a pile body, a side slope and an existing building, frequent observation and frequent measurement of cracks, recording data, uploading and analyzing displacement, subsidence and other phenomena of the side slope and an existing slide-resistant pile; stopping the construction in the tunnel when the observation data exceeds the limit, timely withdrawing the personnel and equipment on the tunnel face, setting a safety warning sign for monitoring the deformation and sinking range of the ground surface, preventing the personnel from entering the area, timely reporting an emergency safety group and taking effective precautionary measures; when the pile is cut, the monitoring frequency of the section is increased by the third party monitoring and measuring, so that favorable data guarantee is provided for construction safety, and the safety of a construction site is guided;

step 8, gradually breaking the anti-slide piles at the lower part to the primary support bottom of the inverted arch

When the lower anti-slide pile is cut off, the inner arc of the vault of the primary steel frame is propped against the lower anti-slide pile by profile steel and welded; the original supporting force of the anti-slide pile is kept;

after the concrete spraying strength is kept for one or two days under the condition of not influencing the tunneling, the supporting section steel is manually cut off, and the cut pile is broken by an excavator; and the other existing anti-slide piles and anchor cables are broken and sheared in the same way.

Preferably, because what adopt earlier excavate in the tunnel excavation process guide pit, excavate the inverted arch part afterwards, consequently the construction of steel bow member 2 is by the construction process from top to bottom, consequently for the holding power of guaranteeing each arch section after the installation, set up arch section supporting seat and arch section and can dismantle the connection at the arch section downside for the effort of arch section can be used in the guide pit bottom.

Example 2: different from the embodiment 1, in order to connect the slide-resistant pile 1 on the upper portion of the steel arch 2 with the steel arch 2 through the steel connecting mechanism 3, and further enable the steel arch 2 and the steel connecting mechanism 3 to form a first safe supporting system to support the slide-resistant pile 1 on the upper portion of the steel arch, the steel connecting mechanism 3 is designed to comprise a first steel connecting piece 31, a second steel connecting piece 32 and a positioning bolt 33, wherein the first steel connecting piece 31, the second steel connecting piece 32 and the positioning bolt 33 are arranged on the steel arch, and the first steel connecting piece 31, the second steel connecting piece 32 and the positioning bolt 33 are arranged on the steel arch 3

The first I-steel connecting piece 31 comprises an I-steel connecting block 311 and a first I-steel base 314 which are connected in a welding mode, and the I-steel connecting block 311 is fixedly welded on a steel bar at the lower end of the slide-resistant pile 1;

the second I-steel connecting piece 32 comprises a second I-steel base 321 and a plurality of connecting plug boards 322 which are connected in a welding mode, the second I-steel base 321 is fixedly installed on the upper side of the steel arch frame 2, and the connecting plug boards 322 are arranged on the second I-steel base 321 and are matched with the I-steel connecting blocks 311 for use;

the positioning bolt 33 is installed between the first I-steel connecting piece 31 and the second I-steel connecting piece 32, and is matched with the adjusting groove 35 arranged on the I-steel connecting block 311 and the connecting inserting plate 322 for use, so that the first I-steel connecting piece 31 is connected with the second I-steel connecting piece 32.

Preferably, two webs 312 are integrally formed between the front and rear baffle plates 315 of the i-steel connecting block 311, an insertion slot 313 is formed between the baffle plates 315, the insertion slot 313 and the connecting insertion plate 322 are used in a matching manner, that is, when in use, the connecting insertion plate 322 is inserted into the insertion slot 313, so that the first i-steel connecting element 31 and the second i-steel connecting element 32 are connected in an insertion manner; simultaneously for using with positioning bolt 33 cooperation, be connected first worker steel connecting piece 31 and second worker steel connecting piece 32 web 312 and connection picture peg 322 on all be provided with adjustment tank 35, adjustment tank 35 uses with positioning bolt 33 cooperation, simultaneously for adjusting the relative distance between first worker steel connecting piece 31 and the second worker steel connecting piece 32 according to different mounting heights adjusting adjustment tank 35 in still be provided with positioning groove 351, positioning groove 351 uses with positioning bolt 33 cooperation to realize the web 312 of different height positions and be connected picture peg 322, increase stability and security after connecting simultaneously.

The using process and the using principle of the I-steel connecting mechanism 3 in the embodiment comprise the following steps:

step 3.2.1, after the anti-slide pile 1 is cut off in the step 3.1, firstly, cleaning concrete residues on the section of the upper anti-slide pile 1 and warping the anti-slide pile steel bars;

step 3.2.2, after the anti-slide pile reinforcing steel bars are warped, welding and connecting the first I-steel base 314 of the first I-steel connecting piece 31 with the anti-slide pile reinforcing steel bars;

step 3.2.3, welding the second I-steel connecting piece 32 on the arch section of the steel arch frame 2, installing the arch section of the steel arch frame 2, and aligning the second I-steel connecting piece 32 with the first I-steel connecting piece 31 to enable the connecting plug board 322 to be inserted into the slot 313;

step 3.2.4, after the second I-steel connecting piece 32 is aligned and spliced with the first I-steel connecting piece 31, the position of an arch section is adjusted according to the design radian of the tunnel, the positioning bolt 33 penetrates through the positioning clamping groove 351 in the position corresponding to the adjusting groove 35, and finally the positioning nut 34 is installed to mechanically connect the second I-steel connecting piece 32 with the first I-steel connecting piece 31; when the anti-slide pile is used, the acting force of the upper anti-slide pile acts on the steel arch frame 2 through the steel connecting mechanism 3, and then the acting force acts on the bottom of the pilot hole through the arch section supporting seat of the arch section of the steel arch frame 2 through the transmission of the acting force between the arch sections of the steel arch frame 2.

Example 3: different from the embodiment, in order to connect the lower slide-resistant pile 1 of the steel arch with the steel arch 2 through the supporting mechanism 4, a second safe supporting system can be formed among the upper slide-resistant pile 1, the steel connecting mechanism 3, the steel arch 2, the supporting mechanism 4 and the lower slide-resistant pile 1 so as to support two chiseling sections at the chiseling section of the slide-resistant pile; the supporting mechanism 4 is designed as a telescopic mechanism and comprises a mounting bottom plate 41, a telescopic cylinder 42, a telescopic rod 43 and a top plate 44, wherein

The installation bottom plate 41 is arranged at the bottom of the telescopic cylinder 42 and is connected with a positioning steel plate 11 welded at the upper end part of the lower slide-resistant pile 1;

the telescopic cylinder 42 is arranged at the upper end of the mounting base plate 41, an adjusting component is arranged in the telescopic cylinder 42 and is matched with the telescopic rod 43 for use, and the telescopic length of the telescopic rod 43 relative to the telescopic cylinder 42 is adjusted through the adjusting component during use;

the telescopic rod 43 is movably arranged in the telescopic cylinder 42 and is matched with the adjusting component for use;

the top plate 44 is rotatably installed at the outer end of the telescopic rod 43 and is used in cooperation with the steel arch frame 2, so that the supporting force of the lower slide-resistant pile 1 is transmitted to the steel arch frame 2 to support the upper slide-resistant pile 1.

Preferably, in order to adjust the extension length of the extension rod 43 relative to the extension cylinder 42, the adjusting assembly comprises an adjusting handle 45 and an adjusting rod 46, wherein

The adjusting handle 45 is arranged at the lower end of the telescopic cylinder 42, a handle bar 451 of the adjusting handle 45 is rotatably connected with the side wall of the telescopic cylinder 42 through a first bearing 452, and a first gear 453 is arranged at the end part of the handle bar 451;

the adjusting rod 46 is rotatably installed in the inner cavity of the telescopic cylinder 42 through a second bearing 462, and a second gear 461 is arranged at the lower end of the adjusting rod 46 and is meshed with the first gear 453, that is, when the telescopic cylinder is used, the adjusting rod 46 is driven to rotate through an adjusting handle 45, the adjusting rod 46 is in threaded connection with the telescopic rod 43, and the telescopic rod 43 is driven to extend and retract along the length direction of the telescopic cylinder 42 through the rotation of the adjusting rod 46.

Preferably, in order to avoid that the adjusting rod 46 drives the telescopic rod 43 to rotate when rotating, so as to affect the adjusting effect, a positioning ring 432 is further arranged on the outer side of the telescopic rod 43, and the positioning ring 432 is matched with a positioning cavity 421 arranged in the inner cavity of the telescopic cylinder 42 for use, that is, when in use, the positioning ring 432 is clamped in the positioning cavity 421, and the adjusting rod 46 rotates to drive the telescopic rod 43 to stretch along the length direction of the telescopic cylinder 42; meanwhile, a screw connection cavity 431 is further arranged in the telescopic rod 43, and an inner wall of the screw connection cavity 431 is provided with an inner thread which is matched with an outer thread arranged on the adjusting rod 46.

Preferably, in order to rotatably mount the top plate 44 at the outer end of the telescopic rod 43, a clamping groove 434 and a positioning hole 433 are further provided on the telescopic rod 43, wherein

The clamping groove 434 is arranged at the upper end of the telescopic rod 43 and is matched with a clamping block 441 arranged at the lower end of the top plate 44 for use, and the clamping block 441 is clamped into the clamping groove 434 when the telescopic rod is used;

the positioning hole 433 is disposed at the upper end of the telescopic rod 43, and penetrates through the engaging groove 434 to be used in cooperation with the positioning pin 47, so that the telescopic rod 43 is connected with the top plate 44 through the positioning pin 47 during use.

The using process and the using principle of the supporting mechanism 4 in the embodiment comprise:

step 3.3.1, before the support mechanism 4 is installed, the cut surface of the lower anti-slide pile is processed, a certain number of positioning steel plates are welded on the section of the lower anti-slide pile according to fixing requirements, and connecting holes are drilled in the positioning steel plates;

step 3.3.2, installing the supporting mechanism 4 on the positioning steel plate by using bolts;

and 3.3.3, after the installation is finished, the adjusting handle 45 is manually rotated to drive the adjusting rod 46 to rotate, the adjusting rod 46 rotates to drive the telescopic rod 43 to stretch along the length direction of the telescopic cylinder 42, so that the top plate 44 is propped against the inner side of the steel arch frame 2, the pressure of the upper anti-slide pile acts on the lower anti-slide pile 1 through the steel arch frame 2 and the supporting mechanism 4 in the construction process, and the steel arch frame 2 is supported.

Example 4: different from the above embodiment, in order to transmit the acting force of the arch section through the arch section supporting seat, so that the acting force of the lower end of the arch section acts on the bottom of the pilot tunnel, the arch section supporting seat comprises a frame body connecting plate 21 and an arch section connecting plate 22, wherein the arch section supporting seat comprises a frame body connecting plate 21 and a frame body connecting plate 22

The support body connecting plate 21 is arranged on the lower side of the arch section connecting plate 22 and is matched with the bottom of a support body or a guide pit for use, the arch section supporting seat is fixedly arranged at the bottom of the support body or the guide pit, a supporting assembly 23 and a supporting seat positioning assembly are arranged on the support body connecting plate 21, the supporting seat positioning assembly is matched with the positioning anchor rod 7 for use, the arch section supporting seat is fixedly connected with a tunnel side wall rock mass, the position of the arch section supporting seat is prevented from moving when the arch section supporting seat receives arch section pressure, and the supporting stability and the supporting safety are ensured;

the arch section connecting plate 22 is installed on the upper side of the frame body connecting plate 21 through the supporting component 23, and is matched with an arch section connecting steel plate of a steel arch frame for use, and the steel arch frame arch section is connected with the arch section supporting seat.

Preferably, in order to be matched with the positioning anchor rod 7 for use in the using process and fixedly connect the arch segment supporting seat with the side wall rock body of the tunnel, the supporting seat positioning assembly comprises a hydraulic cylinder 25 and a telescopic positioning steel piece 26, wherein the supporting seat positioning assembly comprises

The hydraulic cylinder 25 is fixedly arranged on the frame body connecting plate 21 through a hydraulic cylinder positioning steel plate 24, and a movable steel plate 251 is arranged at the end part of a piston rod of the hydraulic cylinder 25;

flexible location steel part 26 passes through the guide and installs on support body connecting plate 21, and is connected with removal steel sheet 251 through connecting steel sheet 252, drives flexible location steel part 26 horizontal motion through removal steel sheet 251 promptly when using, the front end of flexible location steel part 26 still is provided with stock location steel sheet and location stock 7 cooperation and uses, the 7 ankles of location stock are connected this arch section supporting seat and tunnel lateral wall rock mass in the lateral wall rock mass in tunnel.

Preferably, in order to ensure the stable installation, a plurality of reinforcing steel plates 241 are arranged outside the hydraulic cylinder positioning steel plate 24 and are connected with the frame body connecting plate 21 in a welding manner.

Preferably, to guide the movement of the telescopic positioning steel member 26, said guide member comprises a guide base plate 261 and a steel member positioning steel plate 262, wherein

The guide bottom plate 261 is fixedly arranged on the frame body connecting plate 21;

the steel part positioning steel plates 262 are symmetrically welded on the guide bottom plate 261, a guide groove is formed between the two symmetrically arranged steel part positioning steel plates 262 to be matched with the telescopic positioning steel part 26 for use, and the telescopic positioning steel part 26 is guided.

Preferably, in order to mount the arch connecting plates 22 and adjust the levelness of the arch connecting plates 22 so that the height and levelness of the arch connecting plates 22 can be used in cooperation with the steel arch, the support assembly 23 includes an adjusting sleeve 231, a hinge connector 232 and a hinge base 233, wherein,

the hinged base 233 is fixedly installed on the frame body connecting plate 21 and the arch section connecting plate 22;

the hinge connecting piece 232 is rotatably arranged on the hinge base 233 through a pin shaft;

the adjusting sleeve 231 is arranged between the two hinged connectors 232, and internal threads with opposite screwing directions are arranged in the adjusting sleeve 231 and are matched with the screwing rod 2321 arranged on the hinged connectors 232 for use, namely, the levelness of the arch section connecting plate 22 can be adjusted by rotating the adjusting sleeve 231 when in use, so that the height and the levelness of the arch section connecting plate 22 can be matched with the arch section of the steel arch frame.

Preferably, in order to rotate the adjusting sleeve 231, an adjusting clip 2311 is further disposed on the adjusting sleeve 231 for cooperating with an adjusting wrench.

The use process and the theory of use of arch section supporting seat include this embodiment:

(1) After the arch section of the steel arch is installed to the upper side of the bottom of the upper pilot tunnel, selecting whether a support frame needs to be installed at the bottom of a frame connecting plate 21 or not according to the height from the bottom of the upper pilot tunnel to the bottom end of the arch section of the steel arch or installing the frame connecting plate 21 on the bottom of the upper pilot tunnel;

(2) After the arch section supporting seat is installed on the bottom of the upper guide pit, according to the height of the arch section, the assembly 23 is supported, and the arch section connecting plate 22 is abutted to the lower side of the arch section and is connected with the arch section, so that the lower part of the arch section is fixed;

(3) Then according to the distance between the arch section supporting seat and the tunnel wall after installation, the distance between the telescopic positioning steel piece 26 and the tunnel wall is controlled through the hydraulic cylinder 25, the positioning anchor rod 7 is installed in a rock stratum of the tunnel wall after adjustment is completed, and the arch section supporting seat is connected with a rock mass of a tunnel side wall.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A construction method for a tunnel to pass through an existing slide-resistant pile is characterized by comprising the following steps: comprises that

Step 1, in the tunnel construction process, embedding displacement and inclination sensors at measuring points of the ground surface, the pile body, the side slope and the building settlement deformation pile point of the existing slide-resistant pile section;

step 2, measuring and positioning the position of the slide-resistant pile in the tunnel in the tunneling process;

step 3, chiseling the anti-slide pile and erecting a support;

step 4, spraying concrete to seal after the support is erected, so that the support is integrally stressed;

step 5, digging out slots to find out and cut off the anchor cables;

step 6, connecting the steel arch centering to enable the arch centering to support to form a closed loop;

step 7, monitoring and recording the settlement deformation inside and outside the hole;

and 8, gradually breaking the anti-slide piles at the lower part to the primary support bottom of the inverted arch.

2. The construction method of the tunnel crossing existing slide-resistant pile according to claim 1, characterized in that: step 2, the process for measuring and positioning the position of the slide-resistant pile in the hole comprises

Step 2.1, adopting a pilot tunnel on the foundation pit to tunnel to the existing anti-slide pile, and measuring the position of the anti-slide pile;

step 2.2, finding out the position and the shape of the existing anti-slide pile by adopting a manual cut tunneling mode;

and 2.3, completely digging out the anti-slide pile in the rock soil along the pile position by using a digging machine, and measuring the pile shearing elevation.

3. The construction method of the tunnel crossing existing slide-resistant pile according to claim 1, characterized in that: step 3, the process of chiseling the anti-slide pile and erecting the support comprises

3.1 chiseling concrete of the slide-resistant pile along the direction of the primary support surface of the tunnel, mechanically cutting reinforcing steel bars in the concrete of the original slide-resistant pile, and chiseling the slide-resistant pile;

step 3.2, installing an arch section of a steel arch at the arch section position where the chiseling section of the anti-slide pile is located, and welding a steel connecting mechanism on the upper side of the steel arch at the chiseling section of the anti-slide pile to be connected with the chiseling section of the anti-slide pile at the upper part to form a first safety barrier;

3.3, arranging a supporting mechanism corresponding to the position of the tool steel connecting mechanism at the lower side of the steel arch frame at the chisel section of the anti-slide pile to be connected with the lower-end anti-slide pile section to form a second safety barrier;

step 3.4, drilling holes at the lower ends of the anti-slide piles at the upper parts of the steel arch frames and installing a tunnel portal large pipe shed, so that the front of the tunnel portal large pipe shed enters a rock stratum on the top side of the tunnel to form a cantilever beam structure;

and 3.5, after the excavation of the inverted arch part of the tunnel is finished, installing a steel round pipe between two arch feet at the bottom of the steel arch frame to form a fourth safety barrier.

4. The construction method of the tunnel crossing existing slide-resistant pile according to claim 3, characterized in that: the I-steel connecting mechanism comprises a first I-steel connecting piece, a second I-steel connecting piece and a positioning bolt,

the first I-steel connecting piece comprises an I-steel connecting block and a first I-steel base, and the I-steel connecting block is arranged on the section of the lower end of the upper anti-slide pile;

the second I-steel connecting piece comprises a second I-steel base and a connecting plug board, the second I-steel base is fixedly arranged on the upper side of the steel arch frame, and the connecting plug board is arranged on the second I-steel base and is matched with the I-steel connecting block;

the positioning bolt is arranged between the first I-steel connecting piece and the second I-steel connecting piece and is matched with the positioning nut for use.

5. The construction method of the tunnel crossing existing slide-resistant pile according to claim 4, characterized in that: a web plate is integrally formed between two baffle plates of the I-steel connecting block, a slot is formed between the baffle plates, and the slot is matched with the connecting inserting plate for use; and all be provided with the adjustment tank on web and the connection picture peg, still be provided with positioning slot in the adjustment tank, positioning slot uses with the positioning bolt cooperation.

6. The construction method of the tunnel crossing existing slide-resistant pile according to claim 3, characterized in that: the supporting mechanism comprises a mounting bottom plate, a telescopic cylinder, a telescopic rod and a top plate,

the mounting bottom plate is arranged at the bottom of the telescopic cylinder and is connected with a positioning steel plate welded on the upper end surface of the lower anti-slide pile;

the telescopic cylinder is arranged at the upper end of the mounting bottom plate, and an adjusting assembly is arranged in the telescopic cylinder;

the telescopic rod is movably arranged in the telescopic cylinder and is matched with the adjusting component for use;

the top plate is arranged at the end part of the telescopic rod, a clamping block is arranged on the lower side of the top plate and matched with a clamping groove formed in the telescopic rod, and a positioning hole is formed in the clamping groove and matched with the positioning pin.

7. The construction method of the tunnel crossing existing slide-resistant pile according to claim 6, characterized in that: the adjusting component comprises an adjusting handle and an adjusting rod,

the adjusting handle is arranged at the lower end of the telescopic cylinder, a handle rod of the adjusting handle is rotationally connected with the side wall of the telescopic cylinder through a first bearing, and a first gear is arranged at the end part of the handle rod;

the adjusting rod is arranged in the inner cavity of the telescopic cylinder through a second bearing, a second gear is arranged at the lower end of the adjusting rod and is meshed with the first gear, a positioning ring is further arranged on the outer side of the telescopic rod, and the positioning ring is matched with a positioning cavity arranged in the inner cavity of the telescopic cylinder; the telescopic rod is also internally provided with a screw joint cavity, and the inner wall of the screw joint cavity is provided with an internal thread which is matched with an external thread arranged on the adjusting rod.

8. The construction method of the tunnel crossing existing slide-resistant pile according to claim 3, characterized in that: and 3.2, constructing the arch section of the steel arch frame by adopting an installation mode of sequentially assembling from top to bottom, and after the excavation of the pilot tunnel on the foundation pit is finished, arranging an arch section supporting seat at the lower side of the arch section to support the arch section, so that the acting force of the arch section can act on the bottom of the pilot tunnel.

9. The construction method of the existing slide-resistant pile for tunnel crossing according to claim 8, characterized in that: the arch section supporting seat comprises a frame body connecting plate and an arch section connecting plate,

the support body connecting plate is arranged on the lower side of the arch section connecting plate and is matched with the bottom of the support body or the guide pit for use, a support assembly and a support seat positioning assembly are arranged on the support body connecting plate, and the support seat positioning assembly is matched with a positioning anchor rod anchored into a tunnel side wall rock mass for use;

the arch section connecting plate is arranged on the upper side of the frame body connecting plate through the supporting assembly and is connected with the steel arch frame arch section; the support assembly comprises an adjusting sleeve, a hinge connecting piece and a hinge base, and the hinge base is arranged on the frame body connecting plate and the arch section connecting plate; the hinged connecting piece is rotatably connected with the hinged base; the adjusting sleeve is arranged between the two hinged connecting pieces, and internal threads with opposite screwing directions are arranged in the adjusting sleeve and are in screwed connection with screw connecting rods arranged on the hinged connecting pieces.

10. The construction method of the tunnel-crossing existing slide-resistant pile according to claim 9, characterized in that: the supporting seat positioning assembly comprises a hydraulic cylinder and a telescopic positioning steel part,

the hydraulic cylinder is arranged on the frame body connecting plate through a hydraulic cylinder positioning steel plate, and a movable steel plate is arranged at the end part of a piston rod of the hydraulic cylinder;

the telescopic positioning steel piece is arranged on the frame body connecting plate through a guide piece and is connected with the movable steel plate through a connecting steel plate, and an anchor rod positioning steel plate is arranged at the front end of the telescopic positioning steel piece and is matched with a positioning anchor rod for use;

the guide part comprises a guide bottom plate and steel part positioning steel plates, the guide bottom plate is fixedly arranged on the frame body connecting plate, the steel part positioning steel plates are symmetrically arranged on the guide bottom plate, and a guide groove is formed between the two steel part positioning steel plates which are symmetrically arranged and is matched with the telescopic positioning steel part for use.

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