CN119664385A - In-situ disassembly method for broken stratum water delivery tunnel open type TBM shield - Google Patents
In-situ disassembly method for broken stratum water delivery tunnel open type TBM shield Download PDFInfo
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- CN119664385A CN119664385A CN202411789947.5A CN202411789947A CN119664385A CN 119664385 A CN119664385 A CN 119664385A CN 202411789947 A CN202411789947 A CN 202411789947A CN 119664385 A CN119664385 A CN 119664385A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses an in-situ disassembly method of an open TBM (Tunnel boring machine) stay shield of a stratum water conveyance tunnel, which comprises the steps of firstly collapsing cavities at the top of a shield and grouting and reinforcing broken surrounding rocks, secondly integrally welding the shield, thirdly installing a TBM host and a crane span region lifting facility, fourthly installing a supporting lifting facility after TBM and disassembling supporting equipment after TBM, fifthly, disassembling a main beam and a rear support of the TBM host, sixthly, disassembling a main drive and a cutter head of the TBM host, and seventhly, grouting and reinforcing the cutter head and the top region of the shield. The invention adopts the section steel to integrally weld the top, side and bottom shields before disassembling the machine, the shields are not disassembled during disassembling the machine, the shields are reserved as permanent supporting bodies, and then a plurality of hoisting equipment are matched, so that the in-situ safe and efficient disassembling of the machine in a TBM hole is realized, the stability of surrounding rocks of the hole is fully ensured, the construction risk is greatly reduced, and the construction safety and the construction progress are effectively ensured.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to an in-situ disassembly method for an open TBM (Tunnel boring machine) reserved shield of a ground stratum water delivery tunnel.
Background
At present, the TBM method is widely applied in a water delivery tunnel, due to the particularity of TBM equipment, a belt is usually disconnected after a TBM finishes a main tunnel tunneling task by a TBM in-tunnel dismantling machine, a main machine is dismantled for a certain distance to excavate a chamber, after the excavation of the chamber is completed, an electric hoist is arranged at the top of the dismantling chamber, equipment such as a winch and a jack is utilized to dismantle main machine parts, and after a matched trolley is separated section by section, the main machine parts are disassembled and dismantled in situ. The mode requires that the section and the space of the disassembled hole are large enough, the construction difficulty is large, and the construction period is long. When the TBM is extremely broken and can not form a dismantling chamber due to surrounding rock in TBM tunneling, and the TBM reaches the scrapping standard, the shield is blocked, and the forced dismantling machine by adopting the traditional method can face extremely great construction risks.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an in-situ disassembly method for the open TBM shield of the broken stratum water delivery tunnel, which adopts section steel to integrally weld the top shield, the side shield and the bottom shield before disassembly, and the shields are not disassembled when the machine is disassembled, but are reserved as permanent supporting bodies, and are matched with various hoisting equipment, so that the in-situ safe and efficient disassembly in the TBM tunnel is realized, the stability of surrounding rocks of the tunnel is fully ensured, the construction risk is greatly reduced, the construction safety and the construction progress are effectively ensured, good engineering effects are obtained, and the method has a stronger reference effect on similar engineering.
In order to solve the technical problems, the technical scheme adopted by the invention is that the method for detaching the open TBM shield in situ of the broken stratum water delivery tunnel is characterized by comprising the following steps:
Step one, cavity collapse backfilling at the top of a shield and grouting reinforcement on broken surrounding rocks, wherein the process is as follows:
Step 101, spraying, mixing and backfilling a cavity collapsed at the top of a shield, drilling a plurality of first grouting anchors at the tail part of the shield by using a hand drill, arranging the first grouting anchors along the circumferential direction of a tunnel, and arranging the first grouting anchors at the top of the shield;
102, after grouting reinforcement is completed, connecting a steel arch at the tail of the shield by using steel bars and section steel, and sealing the steel arch at the tail of the shield which is not sealed by sprayed concrete;
Welding the joints of the side shields and the top shields by using a connecting steel plate, and welding the top shields, the side shields and the top shields and the side shields and the bottom shields by using connecting steel bars to form a surrounding rock steel support body;
The method comprises the steps of installing a TBM host and a crane span structure region lifting facility, namely, arranging two groups of lifting anchor points on the tops of tunnels corresponding to the TBM host and the crane span structure region, wherein each group of lifting anchor points are uniformly distributed along the extending direction of the tunnels;
step four, installing supporting hoisting facilities after TBM and dismantling supporting equipment after TBM, wherein the process is as follows:
Step 401, simultaneously, two groups of fixed hanging point groups are arranged on the top of a tunnel corresponding to a TBM rear supporting area in a beating mode, wherein each group of fixed hanging point groups are uniformly distributed along the circumferential direction of the tunnel;
Step 402, welding lifting lugs on a frame structure of the TBM rear supporting equipment and installing guide chains;
step 403, after the TBM post-supporting equipment is removed, removing the TBM post-supporting frame structure and transporting out of the tunnel by utilizing a TBM post-supporting lifting facility in sequence;
And fifthly, removing a main beam and a rear support of the TBM host, wherein the process is as follows:
step 501, arranging a plurality of support columns at the bottom of a main beam, wherein the support columns are distributed along the extending direction of the main beam;
Step 502, adjusting the length of the steel wire rope, and removing the main push cylinder and the supporting shoe and transporting out of the hole after the main beam and the rear support are tensioned by using a hoisting chain block;
Step 503, dismantling a connecting bolt between the rear support and the main beam II, detaching the rear support, turning over, placing the rear support at the bottom of the tunnel, and dividing and dismembering the rear support in the tunnel and then sequentially transporting the rear support out of the tunnel, wherein the main beam comprises the main beam I and the main beam II;
step 504, disassembling the saddle, sequentially transporting the saddle out of the hole, and finally disassembling and dismembering the main beam II and the main beam I, and sequentially transporting the saddle out of the hole;
Step six, dismantling a main drive and a cutter head of a TBM host, namely cutting and dismembering the steel structure and a motor reducer at the upper part of the main drive in sequence from top to bottom by adopting a sequence from top to bottom, and transferring dismantled parts to the outside of a transport hole on a scooter by utilizing a lifting frame;
And seventhly, grouting and reinforcing the top areas of the cutterhead and the shield, wherein a plurality of groups of grouting hole groups are drilled at the tops of the cutterhead and the shield, the grouting hole groups are distributed in a quincuncial shape, each grouting hole group comprises a plurality of grouting holes, the grouting holes are distributed along the circumferential direction of the tunnel, a second grouting anchor rod is inserted into each grouting hole, cement grouting is carried out by the aid of the second grouting anchor rod, grouting and reinforcing are carried out on the broken surrounding rock areas at the tops of the cutterhead and the shield, and disassembling and machine is completed.
The method for in-situ disassembly of the open TBM shield of the stratum-breaking water-conveying tunnel is characterized in that in the step 101, the circumferential distance between two adjacent first grouting anchors is 0.5-1 m, the length of each first grouting anchor is 2.0-6.0 m, the inclination angle of each first grouting anchor is 10-45 degrees, the first grouting anchors incline forwards along the extending direction of the tunnel, the included angle between the first grouting anchors on two sides is 120-150 degrees, and when cement slurry is injected by the first grouting anchors, the grouting pressure is not more than 3MPa.
The method for in-situ disassembly of the open TBM shield of the broken stratum water delivery tunnel is characterized in that in the third step, derailment prevention steel plates are arranged at two ends of the first track beam.
The method for in-situ disassembly of the open TBM shield of the ground stratum water conveyance tunnel is characterized in that in the third step, the first track beam is installed at the top of the tunnel through a plurality of first installation pieces, the plurality of first installation pieces are uniformly distributed along the extending direction of the first track beam, four installation holes are formed in each lifting anchor point, and each first installation piece comprises a first installation plate arranged at the lifting anchor point, a first fixed anchor rod arranged between the first installation plate and the installation holes, and a rib plate arranged on the first installation plate and far away from one side of the first fixed anchor rod.
The method for in-situ detaching the shield of the open TBM of the stratum conveying tunnel is characterized in that in step 401, the fixed hanging point groups comprise four fixed hanging point groups distributed along the circumferential direction of the tunnel, the chain blocks are installed at the top of the tunnel through second installation pieces, the number of the second installation pieces is equal to that of the chain blocks and corresponds to that of the chain blocks one by one, each second installation piece comprises a second installation plate arranged at the fixed hanging point, a second fixed anchor rod arranged between the second installation plate and the fixed hanging point, and two installation anchor rods which are arranged on the second installation plate and are uniformly distributed on one side far away from the second fixed anchor rod, one ends of the two installation anchor rods are fixed on the second installation plate, and the chain blocks are installed between the other ends of the two installation anchor rods.
The method for in-situ disassembly of the open TBM shield of the ground stratum water conveyance tunnel is characterized in that in the step six, the hoisting frame is a portal hoisting frame, the hoisting frame comprises a plurality of hoisting frame bodies, the hoisting frame bodies are distributed along the extending direction of the tunnel, a second track beam is arranged among the hoisting frame bodies, the hoisting frame comprises a hoisting cross beam which is horizontally arranged and a supporting vertical beam which is vertically arranged at the bottom of the hoisting cross beam, the hoisting cross beam is connected with the supporting vertical beam through bolts, an inclined support is obliquely arranged between the hoisting cross beam and the supporting vertical beam, and the second track beam is distributed at the bottom of the hoisting cross beam.
The in-situ disassembly method for the open TBM retaining shield of the stratum water conveyance tunnel is characterized in that in the seventh step, an included angle between grouting holes on two sides is 180 degrees, the length of a second grouting anchor rod is 3.5m, the tail of the second grouting anchor rod is welded with a shield, and the distance between two adjacent grouting hole groups is 1.25-1.5 m.
The invention has the advantages that the top, side and bottom shields are integrally welded by adopting the section steel before disassembling the machine, the shields are not disassembled when the machine is disassembled, but are reserved as permanent support bodies, and then the permanent support bodies are matched with various hoisting equipment, so that the in-situ safe and efficient machine disassembling in the TBM hole is realized, the stability of surrounding rocks of the hole is fully ensured, the construction risk is greatly reduced, the construction safety and the construction progress are effectively ensured, good engineering effect is achieved, and the construction method has a stronger reference effect on similar engineering.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a schematic diagram of the placement of a first grouting anchor in a tunnel according to the present invention.
Fig. 2 is a schematic view of the construction state of the whole welding of the shield of the present invention.
Fig. 3 is a schematic view of the installation position of the first rail beam according to the present invention.
FIG. 4 is a schematic view of the installation position of the supporting lifting device in the tunnel after TBM according to the present invention.
Fig. 5 is a schematic view of the construction state of the invention with the main beam and rear support of the TBM main machine removed.
Fig. 6 is a schematic structural view of the lifting frame body of the present invention.
Fig. 7 is a schematic view of the construction state of the motor reducer and the steel structure of the main drive upper part of the TBM main machine removed in the present invention.
Fig. 8 is a schematic view of the construction state of the main drive middle lower part of the TBM host and the cutter head middle lower part of the TBM host removed.
Fig. 9 is a flow chart of the method of the present invention.
Reference numerals illustrate:
1-shield, 2-first grouting anchor rod, 3-tunnel;
4-connecting steel plates, 5-side shields and 6-top shields;
7-a bottom shield, 9-a first track beam;
10-a first mounting plate, 11-a first fixed anchor rod, 12-a rib plate;
13, a chain block, 14, a second mounting plate and 15, a second fixed anchor rod;
16-installing anchor rods, 17-main beams and 18-supporting columns;
19-a main pushing oil cylinder, 20-a supporting shoe and 21-a main beam II;
22-rear support, 23-main beam I, 24-main drive;
25-cutterhead, 26-second track beam, 27-hoisting cross beam;
28-supporting vertical beams, 29-inclined supports and 31-connecting section steel;
32-working platform.
Detailed Description
The method for in-situ disassembly of the open TBM shield of the broken stratum water delivery tunnel as shown in figures 1 to 9 comprises the following steps:
Step one, cavity collapse backfilling at the top of a shield and grouting reinforcement on broken surrounding rocks, wherein the process is as follows:
Step 101, spraying, mixing and backfilling a cavity collapsed at the top of a shield 1 before disassembling, drilling a plurality of first grouting anchors 2 at the tail of the shield 1 by using a hand drill, arranging the first grouting anchors 2 along the circumferential direction of a tunnel 3, uniformly distributing the first grouting anchors 2 at the top of the shield 1, injecting cement paste into the tops of the shield 1 and a cutterhead by using the first grouting anchors 2, and grouting and reinforcing broken surrounding rocks at the tops of the shield 1 and the cutterhead;
102, after grouting reinforcement is completed, connecting a steel arch at the tail part of the shield 1 by using steel bars and section steel, and sealing the steel arch at the tail part of the shield 1 which is not sealed by sprayed concrete;
Welding the whole shield, namely connecting joints of the side shield 5 and the top shield 6 by using a connecting steel plate 4, and welding the joints among the top shields 6, the side shield 5 and the top shield 6 and the joints between the side shield 5 and the bottom shield 7 by using a connecting section steel 31 to form a surrounding rock steel support body;
The method comprises the steps of installing a TBM host and a crane span structure region lifting facility, namely, arranging two groups of lifting anchor points on the tops of tunnels corresponding to the TBM host and the crane span structure region, wherein each group of lifting anchor points are uniformly distributed along the extending direction of the tunnel 3, installing a first track beam 9 by utilizing the lifting anchor points, and installing a lifting chain block on the first track beam 9 to finish the installation of the TBM host and the crane span structure region lifting facility;
step four, installing supporting hoisting facilities after TBM and dismantling supporting equipment after TBM, wherein the process is as follows:
Step 401, two groups of fixed hanging point groups are arranged on the top of a tunnel corresponding to the TBM rear supporting area, and each group of fixed hanging point groups is uniformly distributed along the circumferential direction of the tunnel 3;
Step 402, welding lifting lugs on a frame structure of the TBM rear supporting equipment and installing guide chains;
step 403, after the TBM post-supporting equipment is removed, removing the TBM post-supporting frame structure and transporting out of the tunnel by utilizing a TBM post-supporting lifting facility in sequence;
And fifthly, removing a main beam and a rear support of the TBM host, wherein the process is as follows:
Step 501, arranging a plurality of support columns 18 at the bottom of a main beam 17, wherein the support columns 18 are distributed along the extending direction of the main beam 17, and the top of the main beam 17 is connected with a hoisting chain block pulley by using a steel wire rope;
Step 502, adjusting the length of the steel wire rope, tensioning the main beam 17 and the rear support 22 by using a hoisting chain block, removing the main push cylinder 19 and the support shoe 20, and transporting out of a hole;
Step 503, removing connecting bolts between the rear support 22 and the main beam II 21, detaching and turning the rear support 22, and then placing the rear support 22 at the bottom of the tunnel 3, and dividing and dismembering the rear support 22 in the tunnel 3 and then sequentially transporting the rear support 22 out of the tunnel;
Step 504, disassembling the saddle, sequentially transporting the saddle out of the hole, and finally disassembling and dismembering the main beam II 21 and the main beam I23, and sequentially transporting the saddle out of the hole;
Step six, dismantling the main drive and the cutterhead of the TBM host, namely cutting and dismembering the steel structure and the motor reducer at the upper part of the main drive 24 in sequence from top to bottom by adopting a sequence from top to bottom, and transferring dismantled parts to the outside of a transport hole on a plate vehicle by utilizing a lifting frame;
and seventh, grouting reinforcement is carried out on the top areas of the cutterhead and the shield, namely a plurality of groups of grouting hole groups are drilled on the tops of the cutterhead 25 and the shield 1, the grouting hole groups are distributed in a quincuncial shape, each grouting hole group comprises a plurality of grouting holes, the grouting holes are distributed along the circumferential direction of the tunnel 3, a second grouting anchor rod is inserted into each grouting hole, cement grouting is carried out by utilizing the second grouting anchor rod, grouting reinforcement is carried out on the top broken surrounding rock areas of the cutterhead 25 and the shield 1, and disassembly is completed.
The invention initiates a method for detaching the shield in situ, integrally welds the top shield, the side shield and the bottom shield by adopting the section steel before detaching the shield, and reserves the shield as a permanent support body instead of detaching the shield, and then cooperates with various hoisting equipment to realize safe and efficient detachment of the shield in situ in the TBM hole, fully ensures the stability of surrounding rocks of the hole, greatly reduces construction risk, effectively ensures construction safety and construction progress, obtains good engineering effect and has stronger reference function on similar engineering.
In step 102, the steel arch without concrete spraying is a steel arch with a top arch within a range of 150-270 degrees, and M35 mortar with a thickness of 20cm can be sprayed for sealing.
In the second step, after the surrounding rock steel support body is formed, a guide seat, an oil cylinder, a pipeline and the like in the shield 1 need to be dismantled to be used as a working space for cutting main driving.
In the third step, the first track beam 9 is made of HW175 section steel, two track beams are arranged on the top of the tunnel in a fitting mode, the distance between the two track beams is 1.8m, and the length of each track beam is 36m.
In step 401, the design bearing capacity of a single fixed lifting point is 5t, and the lifting point test detection is the same as that of the host dismounting lifting facility. 8 6t chain blocks are arranged on the fixed lifting points and serve as lifting equipment, the chain blocks are mainly used for lifting the rear supporting upper equipment and the steel structure, when the rear supporting lower equipment is dismounted, lifting lugs or track beams are welded on the rear supporting frame structure, and a chain block or a manual block is arranged for lifting the lower equipment.
In step 402, when the lower equipment matched with the rear is dismantled, lifting lugs or track beams can be welded on the frame structure matched with the rear, and a chain block or a manual hoist is installed to hoist the lower equipment.
In step three and step 401, in the process of installing the TBM host and the bridge area lifting device and installing the TBM post-supporting lifting device, in order to ensure the subsequent normal use of the TBM host and the bridge area lifting device and the TBM post-supporting lifting device, the TBM host and the bridge area lifting device and the TBM post-supporting lifting device need to be installed and tested in the installation process, so that the TBM host and the bridge area lifting device and the TBM post-supporting lifting device can be simultaneously carried out in the installation process, and the installation and test processes can also be repeatedly carried out.
In the fourth step, the fifth step and the sixth step, when the main beam and the rear support of the TBM host machine, and the main drive of the TBM host machine and the dismantling of the cutterhead are sequentially carried out according to the construction sequence, and when the TBM rear supporting equipment is dismantled, the main beam and the rear support of the TBM host machine in the fifth step can be dismantled simultaneously, so that the dismantling time is further saved, and the dismantling efficiency is improved.
In the sixth step, when the upper part of the main drive 24 is removed, the motor speed reducer, the gear and the bearing, the top steel structure of the rear end of the main drive, the top steel structure of the front end of the main drive, the adapter steel structure, the cutter head connecting bolt, the bearing, the motor speed reducer, the gear and the bearing are removed in sequence, and the removed parts are sequentially transferred to the outside of the transport hole on the scooter by using the hoisting frame, and when the cutter head 25 and the rest part of the main drive 24 are removed subsequently, the top steel structure of the cutter head, the middle and upper parts of the main drive, the middle and lower parts of the cutter head and the bottoms of the cutter head 25 and the main drive 24 are removed sequentially.
In the sixth step, the electric and hydraulic components in the shield are to be removed before the cutterhead and the main driving base are removed. Removing the side shield oil cylinder and the wedge oil cylinder, removing the wedge base to enlarge the working space, and removing the bottom connecting pin shaft. And after the cutterhead and the main driving base are dismembered into small blocks in situ, the cutterhead and the main driving base are hoisted and transported out of the tunnel.
And step seven, after the disassembly work is finished, steel structures such as rib plates of the lining section and the like are cut off from the inner side of the shield, and secondary lining and consolidation grouting are performed in time if necessary.
In the process of dismantling the TBM rear supporting equipment, as the steel structure size of the TBM rear supporting connecting bridge is 5.5m wide by 3.9m high, the steel structure size of the spraying mixing bridge is 5.5m wide by 3.8m high, and the steel structure size of the trolley is 5.0m wide by 3.6m high, when the rear supporting steel structure adopts integral transportation, when the wind belt distributed along the line and the belt slag discharging system are dismantled, the belt slag discharging system is not dismantled, the power supply and drainage pipes and the transformer are not dismantled, the illumination along the line is powered off, the illumination, the drainage pump station, the water tank and the like are not required to be dismantled, the air is stopped for a long time, the risk of crushing the wind belt due to water seepage of the hole wall exists, the rear supporting and the main machine are synchronously dismantled once ventilation is stopped, harmful gas generated in the electric welding operation cannot be discharged, meanwhile, the temperature of the working face is increased, and constructors are required to be completely evacuated. In consideration of the above factors, after the rear matched steel structure is decomposed, the steel structure connecting bolts are disassembled and decomposed or are planed at the welding seam to be decomposed and transported out of the hole.
In the fourth step, in the process of removing the supporting equipment after TBM, the main hole continuous belt conveyor, the support hole fixed belt conveyor, the hole external slag-turning belt conveyor and the power supply system are required to be removed synchronously. The dismantling of the belt conveyor system mainly comprises dismantling of an out-hole slag-turning belt conveyor, a support hole fixing belt conveyor and a main hole continuous belt system, wherein the process is as follows.
Main hole continuous belt conveyor dismantling
The belt is removed, namely the total length of the main hole belt is about 36km, and the belt is wound up by a winding machine and then is conveyed out of the hole. After the TBM is stopped and has the condition of dismantling the belt conveyor, the belt is pulled out from the position of the head part of the belt bin to be cut off, 2 belt coiling machines are placed at the head part of the belt bin, the belt is firstly coiled to the former belt coiling machine by utilizing the common driving of the former belt coiling machine and the driving motor, and after the belt is coiled into a large coil of 540 meters, the belt is conveniently transported out of a tunnel, and then the belt is divided into two coils of 270m by utilizing the latter belt coiling machine, so that the requirement of transporting the large coil of 540m can not be met due to the small supporting tunnel transportation space.
And (3) dismantling the belt conveyor support, namely dismantling the belt conveyor support from inside to outside after the winding of the main hole continuous belt is completed. A simple belt conveyor support dismantling working platform is installed on an internal combustion locomotive, and the belt conveyor support, a carrier roller, a chain and the like are dismantled manually.
And the middle relay driving station is dismantled, namely, after the belt on the main hole continuous belt is received into the middle driving relay station, the middle driving relay station system of the belt conveyor is dismantled. And welding lifting lugs on the steel arch centering which is arranged in the middle driving relay station area, installing a chain block, and dismantling the middle driving relay station.
And (3) dismantling the main drive and the belt bin, namely dismantling the belt bin and the main drive station system which are arranged at the intersection section of the main hole after the main hole continuous belt is completely rolled. The main driving station and the belt bin are to be dismantled by manually matching with a 25t gantry crane and a 25t automobile crane which are arranged on the intersecting section of the main tunnel.
Removing support hole fixing belt conveyor and hole outer slag transferring belt conveyor
And (3) dismantling the belt, namely enabling the total length of the supporting hole belt to be about 5.2km, wherein the belt winding mode is consistent with the main hole continuous belt winding mode. Considering that the gradient of the support hole is larger, the lower belt is easy to slide down in the belt winding process, and the upper belt and the lower belt are required to be wound separately in order to ensure construction safety. Before the belt is wound, the upper belt is fixed at the tensioning station by adopting a fixing clamp, the lower belt is fixed section by section, and after the belt is fixed, the belt is cut off from the tail parts of the tensioning platform of the hole belt conveyor and the supporting hole belt return station respectively. And after the belt is cut off, the upper belt is wound by adopting the same method as the main hole continuous belt, after the upper belt is wound to the hole tensioning platform, the rest upper belt and the lower belt connector are subjected to butt joint vulcanization, and then the lower belt winding is completed. When the belt is wound, the belt is prevented from sliding downwards, the belt is fixed by the fixing clamp before cutting off after one roll of belt is wound, and the belt can be cut off after the belt is fixed.
And (3) dismantling the belt conveyor support, namely after the winding of the support hole belt is completed, starting to dismantle the belt conveyor support. The simple belt conveyor support dismantling working platform is installed on the forklift, and the belt conveyor support, the carrier roller, the chain and the like are dismantled manually.
And after the winding of the supporting hole belt is completed, the supporting hole belt driving station, the tensioning device, the outer truss of the hole, the slag transferring belt machine and the like are dismounted, and the structure is dismounted by adopting manual cooperation with a 25t automobile crane.
And finally, dismantling the power supply system, wherein the TBM power supply system dismantling task is to arrange 120 kV high-voltage cable with the length of about 20.4km on the right side of the wall of the hole in the hole entering direction and dismantle 120 kV high-voltage switch cabinet arranged at the intersection section of the main hole. After the TBM stops tunneling and has the power supply system dismantling condition, the power supply is firstly cut off, and the high-voltage cables are sequentially wound up from inside to outside and are transported out of the tunnel. When the 20kV high-voltage cable is wound, the high-voltage cable reel is placed on a scooter towed by an internal combustion locomotive, and the cable is wound by one reel manually. The 20kV high-voltage switch cabinet is disassembled by manually matching with a 25t automobile crane.
In this embodiment, in step 101, the circumferential distance between two adjacent first grouting anchors 2 is 0.5 m-1 m, the length of the first grouting anchor 2 is 2.0 m-6.0 m, the inclination angle of the first grouting anchor 2 is 10 ° to 45 °, the first grouting anchor 2 is inclined forward along the extending direction of the tunnel 3, the included angle between the first grouting anchors 2 at two sides is 120 ° to 150 °, and when cement slurry is injected by using the first grouting anchors 2, the grouting pressure is not more than 3MPa.
In the third embodiment, in the step three, derailment prevention steel plates are disposed at two ends of the first track beam 9.
In the third embodiment, the first track beam 9 is installed at the top of the tunnel 3 through a plurality of first installation members, the plurality of first installation members are uniformly distributed along the extending direction of the first track beam 9, four installation holes are formed in each lifting anchor point, and each first installation member comprises a first installation plate 10 arranged at the lifting anchor point, a first fixing anchor rod 11 arranged between the first installation plate 10 and the installation holes, and a rib plate 12 arranged on the first installation plate 10 and distributed on one side far from the first fixing anchor rod 11.
When in actual use, the upper end of the first track beam 9 is welded with the first fixed anchor rod 11 and the first mounting plate 10, one side of the first mounting plate 10 is welded with the first fixed anchor rod 11, the other side is additionally provided with the rib plate 12, and the two ends of the first track beam 9 are welded with derailment-preventing steel plates with the thickness of 16mm as plugs to prevent the lifting chain block pulley from derailing. 210 t chain block pulleys are arranged on each guide rail and used for hoisting and turning over each structural member. The diameter of the first fixed anchor rod 11 is phi 22, the cement cartridge/common mortar anchor rod with L=2.5m, the anchor rod is of a screw steel HRB400 level, the total length of the anchor rod is 2.5m, the exposed 0.5m, the rock-entering anchoring length is more than or equal to 2m, and the longitudinal arrangement interval of the anchor rod is 2m. And after the lifting appliance is installed and qualified through quality detection and dynamic and static load tests, the host machine is removed in sequence.
In this embodiment, in step 401, the fixed hanging point group includes four fixed hanging point groups distributed along the circumferential direction of the tunnel 3, the chain blocks 13 are mounted on the top of the tunnel 3 through second mounting pieces, the number of the second mounting pieces is equal to that of the chain blocks 13 and corresponds to that of the chain blocks one by one, each second mounting piece includes a second mounting plate 14 disposed at the fixed hanging point, a second fixing anchor 15 disposed between the second mounting plate 14 and the fixed hanging point, and two mounting anchors 16 disposed on the second mounting plate 14 and uniformly distributed on one side far from the second fixing anchor 15, one ends of the two mounting anchors 16 are fixed on the second mounting plate 14, and the chain blocks 13 are mounted between the other ends of the two mounting anchors 16.
In the sixth embodiment, the lifting frame is a door-shaped lifting frame, the lifting frame comprises a plurality of lifting frame bodies, the lifting frame bodies are distributed along the extending direction of the tunnel 3, a second track beam 26 is arranged among the lifting frame bodies, the lifting frame comprises a lifting cross beam 27 horizontally arranged and a supporting vertical beam 28 vertically arranged at the bottom of the lifting cross beam 27, the lifting cross beam 27 is connected with the supporting vertical beam 28 through bolts, an inclined support 29 is obliquely arranged between the lifting cross beam 27 and the supporting vertical beam 28, and the second track beam 26 is distributed at the bottom of the lifting cross beam 27.
As shown in fig. 6, a plurality of working platforms 32 are also horizontally disposed on the supporting vertical beams 28.
In the embodiment, in the seventh step, the included angle between the grouting holes at two sides is 180 degrees, the length of the second grouting anchor rod is 3.5m, the tail of the second grouting anchor rod is welded with the shield 1, and the distance between two adjacent grouting hole groups is 1.25 m-1.5 m.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
Priority Applications (1)
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| CN202411789947.5A CN119664385A (en) | 2024-12-06 | 2024-12-06 | In-situ disassembly method for broken stratum water delivery tunnel open type TBM shield |
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| CN202411789947.5A CN119664385A (en) | 2024-12-06 | 2024-12-06 | In-situ disassembly method for broken stratum water delivery tunnel open type TBM shield |
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