CN112627862A - Combined type arch protection trolley and method for tunnel primary support reinforcement - Google Patents
Combined type arch protection trolley and method for tunnel primary support reinforcement Download PDFInfo
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- CN112627862A CN112627862A CN202110127077.5A CN202110127077A CN112627862A CN 112627862 A CN112627862 A CN 112627862A CN 202110127077 A CN202110127077 A CN 202110127077A CN 112627862 A CN112627862 A CN 112627862A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000002787 reinforcement Effects 0.000 title claims description 44
- 238000010276 construction Methods 0.000 claims abstract description 78
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 57
- 239000010959 steel Substances 0.000 claims description 57
- 230000009545 invasion Effects 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 15
- 238000005336 cracking Methods 0.000 claims description 13
- 239000002689 soil Substances 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 7
- 230000005641 tunneling Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000001012 protector Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/40—Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a combined type arch protection trolley and a method for reinforcing primary support of a tunnel, which are formed by splicing a plurality of sections of movable arch protection unit bodies; the arch protection unit body comprises an arch-shaped workbench, a walking mechanism is arranged at the bottom of the arch-shaped workbench, a plurality of sections of arc-shaped supporting beams which are lapped together to form an arch structure are arranged on one side of the top of the arch-shaped workbench, and each section of arc-shaped supporting beam is connected with the arch-shaped workbench through a telescopic mechanism; through the combination formula of multisection arch protection cell cube concatenation one-tenth arch platform truck, it supports the form including drawing in removal form and extension in, moreover, the steam generator is simple in structure, light portable, it is convenient to implement, and high operability, through the switching of two kinds of working forms, can carry out the deformation section of tunnel preliminary bracing optional position fast, reliable support is consolidated, the arch workstation that the platform truck provided in the cooperation, the staff of being convenient for carries out high altitude construction, but the work efficiency that the preliminary bracing reinforced structure was strengthened to the great improvement shortens construction cycle, reduce financial resources and time input, the operation is safe, high efficiency, therefore, the clothes hanger is strong in practicability.
Description
Technical Field
The invention relates to a combined type arch protection trolley and a combined type arch protection method for tunnel primary support reinforcement, and belongs to the technical field of tunnel construction.
Background
As an underground structure, the construction difficulty of the tunnel is high, the construction risk is prominent, and particularly when the tunnel passes through weak surrounding rocks or a bad geological section, the structural reliability of the primary support of the tunnel cannot be effectively guaranteed. Specifically, when the geological conditions are poor, or due to reasons such as non-standard construction operation, various problems such as cracking deformation, settlement deformation and invasion instability of primary supports often occur in the tunnel construction process, and further construction safety and structural reliability are seriously threatened. In view of the above situation, the most common treatment measure in actual construction is to add a temporary arch protector capable of ensuring the stability of the preliminary bracing during construction on the inner side of the preliminary bracing, and then perform construction work such as radial grouting reinforcement, arch replacement and the like under the protection of the temporary arch protector. And after the stability of the primary support can be ensured by corresponding reinforcement measures, dismantling the temporary arch protector. As a temporary auxiliary construction measure, the temporary arch protector needs to be erected and dismantled repeatedly, and the construction process is relatively complicated. At present, a manual operation mode is mostly adopted in a construction site, the time consumed in the process of erecting and dismantling is relatively long, H-shaped steel used for the temporary arch protection is easy to damage in the process of dismantling, and the material utilization rate is low. In addition, considering that the temporary arch protection is additionally arranged on the premise of potential safety hazards of primary support, and the instability and damage possibility of the primary support exists in the construction process, a certain potential safety hazard exists by adopting a manual construction method.
It can be seen that the existing method for manually constructing the temporary arch protection has the problems of long construction cost, low material utilization rate, large potential safety hazard of constructors and the like. In view of the above, it is an urgent need in the engineering industry to research a combined type arch protection trolley capable of significantly improving construction efficiency and material utilization rate and improving construction safety.
Disclosure of Invention
In view of the above, the present invention provides a combined type arch protecting trolley and a method for reinforcing a tunnel preliminary bracing, which can overcome the defects of the prior art.
The purpose of the invention is realized by the following technical scheme:
a combined type arch protection trolley for primary support and reinforcement of a tunnel is formed by splicing a plurality of sections of movable arch protection unit bodies; the arch protection unit body comprises an arch-shaped workbench, a walking mechanism is arranged at the bottom of the arch-shaped workbench, a plurality of sections of arc-shaped supporting beams which are connected in a lap joint mode to form an arch-shaped structure are arranged on one side of the top of the arch-shaped workbench, and each section of arc-shaped supporting beam is connected with the arch-shaped workbench through a telescopic mechanism.
The adjacent arch protection unit bodies are detachably connected through telescopic longitudinal connecting members.
The arc-shaped supporting beam of the arch protection unit body is also provided with a monitoring and measuring device, and the monitoring and measuring device comprises a soil pressure box arranged at the top of the arc-shaped supporting beam and a steel bar stress meter arranged on the inner side of the arc-shaped supporting beam.
The arched workbench comprises a platform frame with a plurality of layers of steps, one side of the platform frame is provided with a support frame which is arranged in an arched structure, and the support frame is provided with a mounting seat for fixing the telescopic mechanism; the bottom of the platform frame and the bottom of the support frame are provided with stand columns, and the traveling mechanism is arranged at the bottom ends of the stand columns.
The travelling mechanism comprises a V-shaped inclined leg member positioned at the bottom of the upright post, and an expanded steel base plate is arranged at the bottom end of the V-shaped inclined leg member; and the middle part of the V-shaped inclined leg member is provided with a telescopic supporting rod and a bearing roller connected with the telescopic supporting rod.
The arc-shaped supporting beam is arranged in three sections and comprises arc-shaped steel beams at the arch parts, the arc-shaped steel beams at the side parts are symmetrically arranged at the two ends of the arc-shaped steel beams at the arch parts, the bottom surfaces at the two ends of the arc-shaped steel beams at the arch parts are provided with lap joint sections, and lap joint grooves matched with the upper ends of the arc-shaped steel beams at the side parts are arranged at the upper ends of the arc-shaped steel beams at the three sections, so that the three sections of the arc-.
A method for reinforcing preliminary bracing of a tunnel, comprising the steps of:
s1, in the normal construction stage of the tunnel, the multi-section arch protection unit bodies can be connected into a whole through the telescopic longitudinal connecting members to form a combined arch protection trolley which is arranged at the tail part of the upper or middle step in the tunnel for standby;
s2, when the initial support has cracking deformation, settlement deformation, convergence deformation and the like, determining the deformation range of the initial support through a measuring means, judging the deformation of the initial support, and judging whether the initial support is slight cracking deformation or limited invasion deformation;
s3, moving part or all of the combined type arch protection trolleys to the primary support deformation section quickly according to the deformation range, switching to the unfolding support form, and performing support reinforcement on the deformation section;
s4, judging the deformation is slight cracking, and carrying out radial grouting reinforcement operation on the deformed section;
and s 4', judging that the limit invasion deformation is carried out, constructing by adopting a scheme of changing arch from one roof truss to another roof truss until all primary supports of the limit invasion are completely dismantled and rebuilt, and completing the radial grouting reinforcement construction of all the sections.
In the steps, monitoring the stress of the primary support by monitoring and measuring equipment arranged on the arc-shaped support beam of the arch protection unit body, detecting the deformation pressure of the primary support by a soil pressure cell, and detecting the stress of the arc-shaped support beam by a steel bar stress meter;
and (4) monitoring, measuring and observing, and judging the deformation condition of the primary support by combining the detection values of the soil pressure box and the steel bar stressometer.
In the step s4, if it is judged that the cracking deformation is slight, the following operations are performed:
s4.1, moving part or all of the combined type arch protection trolleys to quickly move to a primary support deformation section according to actual conditions, and switching to a spread support form to ensure the safety during construction, wherein the construction of people on the face does not need to be suspended;
and S4.2, the construction vehicle and the constructors are in place, the constructors can synchronously carry out radial grouting reinforcement operation on the primary support deformation section on the arch-shaped working platform of the multi-section arch protection unit body, and after grouting is finished and grout is solidified, the combined arch protection trolley is withdrawn from the tail part of the upper or middle step to wait for next calling.
In the step s 4', it is determined that the deformation is a limit violation deformation, and the following operations are performed:
s 4.1', immediately evacuating workers at the face position, and suspending face tunneling construction;
s 4.2', moving part or all of the combined type arch protection trolleys to quickly move to a primary support deformation section according to actual conditions, and switching to a spread support form to prevent instability damage possibly generated by primary support;
s 4.3', placing the construction vehicle and the constructors in place, and constructing oblique grouting small guide pipes by the constructors from the back of the undeformed I-shaped steel to the primary support invasion limit section by means of the first arch protection unit body to perform grouting reinforcement on the surrounding rock;
s4.4 'and s 4.3', the first arch protection unit body is switched to a furled moving form, is separated from the subsequent arch protection unit body, and is driven back to the tail part of the upper or middle step, and then construction vehicles and construction personnel are positioned on the second arch protection unit body;
s 4.5', under the protection of an arch protection trolley and a first circulation oblique grouting pipe, a constructor demolishs and reconstructs the primary support invading the secondary lining limit, and then applies a small radial grouting pipe to perform secondary grouting reinforcement on the arch replacing section so as to ensure the subsequent structural reliability of the primary support of the section;
s 4.6', applying a second circulating oblique grouting small conduit to the section which is not changed with the arch from the back of the replaced I-steel, and grouting and reinforcing the surrounding rock;
s4.7 ', repeating the steps from s4.3 ' to s4.6 ', sequentially organizing and combining the allocation and construction of the arch protection trolley, the construction vehicle and the constructor, and enabling the idle arch protection unit bodies to move back to the tail part of the upper or middle step and be connected into a whole to wait for next allocation;
and s 4.8', constructing by adopting a scheme of changing arch by one truss until all the early supports of the invasion are completely removed, and completing the radial grouting reinforcement construction of all the sections.
Compared with the prior art, the combined type arch protection trolley for the primary support and reinforcement of the tunnel is formed by splicing a plurality of sections of movable arch protection unit bodies; the combined type arch protection trolley comprises a furling moving form and an expanding supporting form, is in the furling moving form and is placed at the tail part of an upper or middle step arranged in a tunnel for standby use in tunnel construction engineering, and a middle cavity of the arch working table is a construction channel, so that workers and construction vehicles can conveniently pass through the combined type arch protection trolley; when primary support deformation occurs, the combined type arch protection trolley can be quickly moved to a deformation section, so that an expanded support form is formed for deformation support reinforcement. The invention also discloses a method for reinforcing the primary support of the tunnel, which judges the deformation of the primary support when the combined type arch protection trolley is reasonably arranged, and judges whether the primary support is slightly cracked and deformed or is invaded and limited and deformed; if the crack and deformation are slight, carrying out radial grouting reinforcement operation on the deformation section; and if the deformation is limited by invasion, constructing by adopting a scheme of changing arch from one truss to another until all primary supports of the limited invasion are completely dismantled and rebuilt, and completing the radial grouting reinforcement construction of all the sections.
The invention has the beneficial effects that:
(1) the combined type arch protection trolley can be arranged in a furling moving mode and an expanding supporting mode, is simple in structure, light and portable, convenient to implement and high in operability, can be used for quickly and reliably supporting and reinforcing a deformation section at any position of a tunnel primary support through switching of the two working modes, is convenient for workers to perform high-altitude operation by matching with an arched working platform provided by the trolley, can greatly improve the working efficiency of primary support reinforcement construction, shortens the construction period, reduces financial resources and time investment, and is high in practicability;
(2) the support reinforcement of the primary support deformation section can be carried out in time, the possible instability damage of the primary support can be prevented and slowed down, the construction risk of tunnel constructors is effectively reduced, and the safety is high;
(3) the combined type arch protection trolley is placed in a tunnel for a standby supporting and reinforcing device, and the tunnel is dug forwards and then moves forwards along with the tunnel, so that the supporting and reinforcing are carried out in time, and the problem of low repeated utilization rate of temporary arch protection materials is effectively solved;
(4) the invention sets reasonable and efficient reinforcement measures for the primary support deformation section according to the combined type arch protection trolley, has safe and efficient operation, and can obviously improve the construction efficiency of primary support arch replacement or grouting reinforcement construction.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the telescopic longitudinal connecting member 5 of fig. 1.
Fig. 3 is a schematic structural view of the telescopic longitudinal rod 501 in fig. 2.
Fig. 4 is a schematic structural view of the screw hole seat 8 in fig. 1.
Fig. 5 is a schematic structural view of the card slot structure 9 in fig. 1.
Fig. 6 is a schematic structural view of the arch protection unit body in fig. 1.
Fig. 7 is a schematic structural view of the arched table 1 in fig. 6.
Fig. 8 is a schematic structural view of the supporting frame 102 in fig. 6.
Fig. 9 is a partially enlarged view of a portion a in fig. 8.
Fig. 10 is a partially enlarged view of part B of fig. 8.
Fig. 11 is a partially enlarged view of portion C of fig. 8.
Fig. 12 is a schematic view of the construction of the pallet 10 of fig. 1.
Fig. 13 is a schematic view of the arched working platform 1 in the tunnel.
Fig. 14 is a structural schematic view of a folded moving form of the arch protection unit body placed in the tunnel.
Fig. 15 is a structural schematic diagram of an extended support configuration of an arch protection unit body placed in a tunnel.
Fig. 16 is a construction flowchart when the primary bracing is slightly deformed by cracking.
Fig. 17 is a first construction flowchart when primary bracing is deformation due to invasion.
Fig. 18 is a second construction flowchart when primary bracing is deformation due to invasion.
Fig. 19 is a third construction flow chart when primary bracing is deformation due to invasion.
Fig. 20 is a fourth construction flowchart when primary bracing is deformation in the penetration limit.
Fig. 21 is a fifth construction flowchart when primary bracing is deformation in the penetration limit.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
As shown in fig. 1-12, a combined type arch protection trolley for tunnel preliminary bracing reinforcement is formed by splicing a plurality of sections of movable arch protection unit bodies; the arch protection unit body comprises an arch-shaped workbench 1, a walking mechanism 2 is arranged at the bottom of the arch-shaped workbench 1, a plurality of sections of arc-shaped supporting beams 3 which are connected in a lap joint mode to form an arch structure are arranged on one side of the top of the arch-shaped workbench, and each section of arc-shaped supporting beam 3 is connected with the arch-shaped workbench 1 through a telescopic mechanism 4.
2-5, adjacent arch protection unit bodies are detachably connected through a telescopic longitudinal connecting member 5. The front side and the rear side of each arch protection unit body are respectively provided with a screw hole seat 8 and a clamping groove structure 9 which correspond to each other in position, so that one section of each two adjacent arch protection unit bodies is hinged with the telescopic longitudinal connecting member 5 through a bolt, and the other section of each two adjacent arch protection unit bodies is connected with the telescopic longitudinal connecting member 5 through a buckle. Preferably, the arch protection unit body is provided with a connecting beam 6, a screw hole seat 8 is arranged at one end of the connecting beam 6, and a clamping groove structure 9 is arranged at the other end of one end of the connecting beam 6.
Specifically, the telescopic longitudinal connecting member 5 comprises a telescopic longitudinal rod 501, one end of the telescopic longitudinal rod 501 is provided with a bolt connecting portion 502, the other end of the telescopic longitudinal rod 501 is provided with an L-shaped fixture block 503, so that one of two adjacent arch protection unit bodies is hinged to the telescopic longitudinal connecting member 5 through the bolt connecting portion 502, and the other one of the two adjacent arch protection unit bodies is connected with the telescopic longitudinal connecting member 5 through the L-shaped fixture block 503 in a snap-fit manner. The telescopic longitudinal rod 501 can be a hydraulic/electric jack mechanism, an electric hydraulic push rod mechanism or a hydraulic oil cylinder, a plurality of sections of arch protection unit bodies can be connected into a whole through the telescopic longitudinal connecting member 5 to form a combined type arch protection trolley to perform cooperative work, the longitudinal distance between the plurality of sections of arch protection unit bodies is adjusted through the telescopic longitudinal rod 501, and the application range is wide.
And a monitoring and measuring device 7 is also arranged on the arc-shaped supporting beam 3 of the arch protection unit body. The monitoring and measuring equipment 7 comprises a soil pressure box 701 arranged at the top of the arc-shaped supporting beam 3 and a steel bar stress meter 702 arranged at the inner side of the arc-shaped supporting beam 3.
In detail, as shown in fig. 6, the arched workbench 1 comprises a platform frame 101 arranged in multiple steps, a support frame 102 arranged in an arched structure is arranged on one side of the platform frame 101, and a mounting seat 103 for fixing the telescopic mechanism 4 is arranged on the support frame 102; a column 104 is arranged at the bottom of the platform frame 101 and the supporting frame 102, and the travelling mechanism 2 is arranged at the bottom end of the column 104.
Preferably, the platform frame 101 and the support frame 102 can also be designed into a detachable connecting structure, the use flexibility is good, when the platform frame 101 is used alone, the platform frame 101 can be used for high-altitude operation, and the support frame 102 can be used for protective support of tunnel primary support deformation in combination with the arc-shaped support beam 3; and the combined use can realize high-altitude operation and protective support at the same time.
Referring to fig. 7-13 in detail, the platform frame 101 and the support frame 102 are both truss structures. Specifically, the platform frame 101 comprises an upper step platform frame 1011, inclined struts 1012 are symmetrically arranged at two ends of the upper step platform frame 1011, and a middle step platform frame 1013 and a lower step platform frame 1014 are respectively arranged at the middle parts and the bottom parts of the inclined struts 1012; the support frame 102 comprises a support truss 1021 arranged at the rear side of an upper step platform frame 1011, and upper inclined struts 1022 are symmetrically arranged at two ends of the support truss 1021; the number of the upright posts 104 is four, the top ends of the upright posts are fixedly connected with the bottom ends of the middle step platform frame 1013 and the upper inclined strut 1022, and the bottom ends are supported on the ground through the traveling mechanism 2. The mounting bracket of the telescoping mechanism includes a wedge-shaped triangular spacer 1031 laid on the upper surface of the upper diagonal brace 1022, and a horizontal tube socket 1032 disposed on the upright 104, and the horizontal tube socket 1032 is located at the rear side of the lower step platform frame 1014.
The upper step platform frame 1011 is a herringbone frame structure, and the inclined strut 1012, the middle step platform frame 1013 and the lower step platform frame 1014 are rectangular frame structures; and the support frame 102 is a triangular frame structure.
A base plate 10 convenient for stepping is laid on the platform frame 101, and a ladder 11 is arranged on the side part, so that the high-altitude operation of the working personnel on the platform frame 101 is facilitated. Preferably, the skid plate 10 is laid on the upper step platform frame 1011, the middle step platform frame 1013 and the lower step platform frame 1014. The backing plate 10 is a steel wire mesh plate.
The telescoping mechanism 4 comprises a first telescoping mechanism 401 vertically disposed on the surface of the support truss 1021 and the upper section of the upper diagonal brace 1022, and a second telescoping mechanism 402 horizontally disposed on the lower section of the upper diagonal brace 1022 and the upright post 104. The first telescopic mechanism 401 and the second telescopic mechanism 402 are both hydraulic/electric jack mechanisms or hydraulic oil cylinders.
The walking mechanism 2 comprises a V-shaped inclined leg member 201 positioned at the bottom of the upright post 104, and the middle part of the V-shaped inclined leg member 201 is provided with a telescopic supporting rod 202 and a bearing roller 203 connected with the telescopic supporting rod; the telescoping support rods 202 may be hydraulic/electric jacks or hydraulic rams. When the telescopic supporting rod 202 extends out, the walking state of the bearing roller 203 on the ground can be realized; conversely, when the telescopic supporting rod 202 retracts, the bearing roller 203 can be lifted off, and the working state of supporting the ground by the V-shaped inclined leg member 201 is switched.
The bottom end of the V-shaped inclined leg member 201 is provided with an expanded steel base plate 204, so that the supporting area can be enlarged, and the stability and the safety are better.
The arc-shaped support beam 3 is a main stress structure bearing primary support stress, is provided with three sections and comprises an arch-shaped steel beam 301, side arc-shaped steel beams 302 are symmetrically arranged at two ends of the arch-shaped steel beam 301, lap joint sections 3011 are arranged on the bottom surfaces of two ends of the arch-shaped steel beam 301, and lap joint grooves 3021 matched with the side arc-shaped steel beams are arranged at the upper ends of the side arc-shaped steel beams, so that the three sections of arc-shaped steel beams are lapped through the groove shape in an extended support state, an arc-shaped stress structure mutually supported is formed among the three sections of arc-shaped steel beams; the bottom end of the side arc-shaped steel beam 302 is provided with a telescopic supporting leg 303; the telescopic supporting legs 303 can be operated in a telescopic manner by a hydraulic/electric jack machine or a built-in hydraulic oil cylinder. In the folded moving state, the telescopic supporting legs 303 retract to the ground, so that the telescopic supporting legs are more convenient to move; in the expanded supporting state, the telescopic supporting leg 303 is grounded, so that the supporting strength is effectively increased.
The bottom end of the telescopic supporting leg 303 is provided with an enlarged supporting leg 3031, so that the supporting area can be enlarged, and the stability and the safety are better.
In addition, the wear-resistant buffer gasket 12 is arranged at the lap joint section 3011 of the arch arc steel beam and the lap joint groove 3021 of the side arc steel beam, so that the arch arc steel beam has certain buffer deformation capacity and longer service life.
A method based on the combined type arch protection trolley comprises the following steps:
s1, in the normal construction stage of the tunnel, the multi-section arch protection unit bodies can be connected into a whole through the telescopic longitudinal connecting member 5 to form a combined type arch protection trolley which is arranged at the tail part of the upper or middle step 13 in the tunnel for standby;
s2, when the initial support has cracking deformation, settlement deformation, convergence deformation and the like, determining the deformation range of the initial support through a measuring means, judging the deformation of the initial support, and judging whether the initial support is slight cracking deformation or limited invasion deformation;
s3, moving part or all of the combined type arch protection trolleys to the primary support deformation section quickly according to the deformation range, switching to the unfolding support form, and performing support reinforcement on the deformation section;
s4, if the crack and deformation are slight, carrying out radial grouting reinforcement operation on the deformed section;
s 4', if the deformation is limit-invading deformation, adopting a scheme of changing arch by roof trusses until all the limit-invading primary supports are completely removed and rebuilt, and completing the radial grouting reinforcement construction of all the sections.
With particular reference to figures 13-14 of the drawings,
in step s1, during the normal construction phase of the tunnel,
s1.1, connecting the multiple sections of arch protection unit bodies into a whole through a telescopic longitudinal connecting member 5 to form a combined arch protection trolley;
s1.2, arranging the combined type arch protection trolley at the tail part of the upper or middle step 13 in the tunnel and taking a furled moving state, specifically, enabling the arc-shaped steel beam 301 at the arch part and the arc-shaped steel beams 302 at the two side parts to be in a furled state, extending the telescopic supporting rod 202 of the walking mechanism to enable the bearing roller 203 to land, and retracting the telescopic supporting foot 303 at the bottom end of the arc-shaped steel beam at the side part to take a suspended state;
s1.3, arranging a tunnel escape pipeline 14 at the side position of the combined arch protection trolley;
in the normal construction stage of the tunnel, the combined type arch protecting trolley is not in direct contact with the primary support, and has no influence on the stress of the primary support, but can be used as a countermeasure for preventing the primary support from suddenly settling and destabilizing caused by the excavation of a lower step;
construction vehicles and construction personnel can pass through the lower channel of the arched workbench;
when the tunnel is tunneled forwards, the combined type arch protection trolley moves forwards along with the tunnel under the driving of the bearing roller 203.
In step s2, when the initial support has cracking deformation, settlement deformation, convergence deformation, etc.,
specifically, as shown in fig. 15, the combined type arch protecting trolley is driven to the primary support deformation section through the bearing roller 203, and the longitudinal distance between the multiple sections of arch protecting unit bodies is adjusted through the telescopic longitudinal connecting member 5 in combination with the actual situation of the primary support, and then the combined type arch protecting trolley is switched to the expansion support form,
specifically, the method comprises the following extension steps:
retracting the telescopic supporting rod 202 of the walking mechanism to separate the bearing roller 203 from the ground, and enlarging the steel base plate 204 to land;
the first telescopic mechanism 401 is synchronously extended to drive the arch part arc-shaped steel beam 301 to expand outwards and abut against the primary support;
the second telescopic mechanism 402 is synchronously extended to drive the side arc-shaped steel beam 302 to expand, and the side arc-shaped steel beam 302 is lapped with the arch arc-shaped steel beam 301 and props against the primary support;
the telescopic supporting legs 303 at the bottom ends of the side arc-shaped steel beams 302 are extended, the expanding supporting legs 3031 are grounded, and the steel ring beam consisting of the arch arc-shaped steel beams 301 and the two side arc-shaped steel beams 302 is in a tight stress state;
in the step s3, monitoring the primary support stress through the monitoring and measuring equipment 7 arranged on the arc-shaped support beam 3 of the arch protection unit body, specifically, detecting the deformation pressure of the primary support through the soil pressure box 701 arranged at the top of the arc-shaped support beam 3, and detecting the stress of the arc-shaped support beam 3 through the steel bar stressometer 702 arranged at the inner side of the arc-shaped support beam 3; through monitoring and observation, the stress condition of the primary support is judged by combining the detection values of the soil pressure box 701 and the steel bar stressometer 702, and a basis is provided for the determination of subsequent specific support parameters.
With particular reference to figure 16 of the drawings,
in step s4, if the crack and deformation are slight, arch change is not needed, specifically the following operations are carried out:
s4.1, moving part or all of the combined type arch protection trolleys to quickly move to a primary support deformation section according to actual conditions, and switching to an expanded support form to ensure the safety during construction, wherein the construction of face personnel is not required to be suspended;
and S4.2, the construction vehicle and the constructors are in place, the constructors can synchronously carry out radial grouting reinforcement operation on the primary support deformation section on the arch-shaped working platform 1 of the multi-section arch protection unit body, and after grouting is finished and grout is solidified, the combined arch protection trolley is withdrawn from the tail part of the upper or middle step 13 to wait for next calling.
With particular reference to figures 17-21 of the drawings,
in step s 4', if the deformation is limit-violation deformation, arch change needs to be performed, specifically the following operations are performed:
s 4.1', immediately evacuating workers at the face position, and suspending face tunneling construction;
s 4.2', moving part or all of the combined type arch protection trolleys to quickly move to a primary support deformation section according to actual conditions, and switching to a spread support form to prevent instability damage possibly generated by primary support;
s 4.3', placing the construction vehicle and constructors in place, and constructing oblique grouting small guide pipes 15 by the constructors through the first arch protection unit bodies from the back of the undeformed I-steel to the primary support invasion limit section to perform grouting reinforcement on the surrounding rock;
s4.4 'and s 4.3', the first arch protection unit body is switched to a furled moving form, is separated from the subsequent arch protection unit body, and is driven back to the tail part of the upper or middle step 13, and then construction vehicles and construction personnel are positioned on the second arch protection unit body;
s 4.5', under the protection of an arch protection trolley and a first circulation oblique grouting pipe, a constructor demolishs and reconstructs the primary support invading the secondary lining limit, and then applies a radial grouting small conduit 16 to perform secondary grouting reinforcement on the arch replacing section so as to ensure the subsequent structural reliability of the primary support of the section;
s 4.6', applying a second circulating oblique grouting small conduit 15 from the replaced I-steel back to the section which is not replaced with the arch, and grouting and reinforcing the surrounding rock;
s4.7 ', repeating the steps from s4.3 ' to s4.6 ', sequentially organizing and combining the allocation and construction of the arch protection trolley, the construction vehicle and the constructor, and enabling the idle arch protection unit bodies to move back to the tail part of the upper or middle step 13 and be connected into a whole to wait for next call;
and s 4.8', adopting the scheme of replacing the arch by one truss till all the primary supports of the invasion are completely removed, and completing the radial grouting reinforcement construction of all the sections.
Considering that all primary support limit-invasion sections are completely replaced, the inclined grouting small guide pipe 15 is not arranged in the subsequent construction section.
And conveying the waste residues generated in the arch changing process out of the tunnel by the construction vehicle, recovering traffic in the tunnel, and then recovering the tunneling construction of the tunnel face.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention without departing from the technical spirit of the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a be used for reinforced (rfd) combination formula of tunnel preliminary bracing to protect and encircle platform truck which characterized in that: the movable arch protection device is formed by splicing a plurality of sections of movable arch protection unit bodies; the arch protection unit body comprises an arch-shaped workbench (1), a walking mechanism (2) is arranged at the bottom of the arch-shaped workbench (1), a plurality of sections of arc-shaped supporting beams (3) which are connected in an overlapping mode to form an arch structure are arranged on one side of the top of the arch-shaped workbench, and each section of arc-shaped supporting beam (3) is connected with the arch-shaped workbench (1) through a telescopic mechanism (4).
2. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 1, wherein: the adjacent arch protection unit bodies are detachably connected through a telescopic longitudinal connecting member (5).
3. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 2, wherein: the arch protection unit is characterized in that monitoring and measuring equipment (7) is further arranged on the arc-shaped supporting beam (3) of the arch protection unit body, and the monitoring and measuring equipment (7) comprises a soil pressure box (701) arranged at the top of the arc-shaped supporting beam (3) and a steel bar stress meter (702) arranged on the inner side of the arc-shaped supporting beam (3).
4. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 2, wherein: the arched workbench (1) comprises a platform frame (101) with multiple layers of steps, a support frame (102) in an arched structure is arranged on one side of the platform frame (101), and a mounting seat (103) for fixing the telescopic mechanism (4) is distributed on the support frame (102); the bottom parts of the platform frame (101) and the support frame (102) are provided with upright columns (104), and the travelling mechanism (2) is arranged at the bottom ends of the upright columns (104).
5. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 2, wherein: the walking mechanism (2) comprises a V-shaped inclined leg member (201) positioned at the bottom of the upright post (104), and an expanded steel base plate (204) is arranged at the bottom end of the V-shaped inclined leg member (201); and a telescopic supporting rod (202) and a bearing roller (203) connected with the telescopic supporting rod are arranged in the middle of the V-shaped inclined leg member (201).
6. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 2, wherein: the arc-shaped supporting beam (3) is arranged in three sections and comprises an arch-shaped steel beam (301), lateral arc-shaped steel beams (302) are symmetrically arranged at two ends of the arch-shaped steel beam (301), lap joint sections (3011) are arranged on bottom surfaces of two ends of the arch-shaped steel beam (301), lap joint grooves (3021) matched with the lateral arc-shaped steel beams are formed in the upper ends of the lateral arc-shaped steel beams (302), and the three sections of arc-shaped steel beams are overlapped through groove shapes in an extended supporting state, so that a mutually supported structure is formed between the three sections of arc-shaped.
7. A method for reinforcing a primary support of a tunnel is characterized by comprising the following steps:
s1, in the normal construction stage of the tunnel, the multi-section arch protection unit bodies can be connected into a whole through the telescopic longitudinal connecting member (5) to form a combined type arch protection trolley which is arranged at the tail part of the upper or middle step (13) in the tunnel for standby;
s2, when the initial support has cracking deformation, settlement deformation, convergence deformation and the like, determining the deformation range of the initial support through a measuring means, judging the deformation of the initial support, and judging whether the initial support is slight cracking deformation or limited invasion deformation;
s3, moving part or all of the combined type arch protection trolleys to the primary support deformation section quickly according to the deformation range, switching to the unfolding support form, and performing support reinforcement on the deformation section;
s4, judging the deformation is slight cracking, and carrying out radial grouting reinforcement operation on the deformed section;
and s 4', judging that the limit invasion deformation is carried out, constructing by adopting a scheme of changing arch from one roof truss to another roof truss until all primary supports of the limit invasion are completely dismantled and rebuilt, and completing the radial grouting reinforcement construction of all the sections.
8. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 7, wherein: in the step s3, monitoring the stress of the primary support by a monitoring and measuring device (7) arranged on the arc-shaped support beam (3) of the arch protection unit body, detecting the deformation pressure of the primary support by a soil pressure box (701), and detecting the stress of the arc-shaped support beam (3) by a steel bar stress meter (702);
and (3) carrying out primary support deformation judgment by monitoring, measuring and observing and combining the detection values of the soil pressure box (701) and the steel bar stress meter (702).
9. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 7, wherein: in step s4, if it is judged that the cracking deformation is slight, the following operations are performed:
s4.1, moving part or all of the combined type arch protection trolleys to quickly move to a primary support deformation section according to actual conditions, and switching to a spread support form to ensure the safety during construction, wherein the construction of people on the face does not need to be suspended;
s4.2, the construction vehicle and the constructors are in place, the constructors can synchronously carry out radial grouting reinforcement operation on the primary support deformation section on the arch-shaped working platform (1) of the multi-section arch protection unit body, and after grouting is completed and grout is solidified, the combined arch protection trolley is withdrawn to the tail part of the upper or middle step (13) to wait for next calling.
10. The combined type arch protecting trolley for tunnel preliminary bracing reinforcement according to claim 7, wherein: in step s 4', it is determined that the deformation is a limit violation deformation, and the following operations are performed:
s 4.1', immediately evacuating workers at the face position, and suspending face tunneling construction;
s 4.2', moving part or all of the combined type arch protection trolleys to quickly move to a primary support deformation section according to actual conditions, and switching to a spread support form to prevent instability damage possibly generated by primary support;
s 4.3', placing the construction vehicle and constructors in place, and constructing oblique grouting small guide pipes (15) by the constructors through the first arch protection unit bodies from the back of the undeformed I-steel to the primary support invasion limit section to perform grouting reinforcement on the surrounding rock;
s4.4 'and s 4.3', the first arch protection unit body is switched to a furled moving state, is separated from the subsequent arch protection unit body, and is driven back to the tail part of the upper or middle step (13), and then construction vehicles and construction personnel are positioned at the second arch protection unit body;
s 4.5', under the protection of an arch protection trolley and a first circulation oblique grouting pipe, a constructor demolishs and reconstructs the primary support invading the secondary lining limit, and then applies a small radial grouting pipe (16) to perform secondary grouting reinforcement on the arch replacing section so as to ensure the subsequent structural reliability of the primary support of the section;
s 4.6', applying a second circulating oblique grouting small conduit (15) from the replaced I-steel back to the section which is not replaced with the arch, and grouting and reinforcing the surrounding rock;
s4.7 ', repeating the steps from s4.3 ' to s4.6 ', sequentially organizing and combining the allocation and construction of the arch protection trolley, the construction vehicle and the constructor, and enabling the idle arch protection unit bodies to move back to the tail part of the upper or middle step (13) and be connected into a whole to wait for next call;
and s 4.8', constructing by adopting a scheme of changing arch by one truss until all the early supports of the invasion are completely removed, and completing the radial grouting reinforcement construction of all the sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110127077.5A CN112627862A (en) | 2021-01-29 | 2021-01-29 | Combined type arch protection trolley and method for tunnel primary support reinforcement |
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| CN202110127077.5A CN112627862A (en) | 2021-01-29 | 2021-01-29 | Combined type arch protection trolley and method for tunnel primary support reinforcement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183163A (en) * | 2021-11-24 | 2022-03-15 | 中国建筑一局(集团)有限公司 | Device suitable for long and large tunnel multi-working-face cooperative construction |
| WO2023082614A1 (en) * | 2021-11-12 | 2023-05-19 | 贵州省交通规划勘察设计研究院股份有限公司 | Tunnel lining inspection and repair trolley and method for repairing structural defects |
| GB2618420A (en) * | 2021-11-12 | 2023-11-08 | Guizhou Transp Planning Survey And Design Academe Co Ltd | Tunnel lining maintenance trolley and structure damage repair method |
-
2021
- 2021-01-29 CN CN202110127077.5A patent/CN112627862A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023082614A1 (en) * | 2021-11-12 | 2023-05-19 | 贵州省交通规划勘察设计研究院股份有限公司 | Tunnel lining inspection and repair trolley and method for repairing structural defects |
| GB2618420A (en) * | 2021-11-12 | 2023-11-08 | Guizhou Transp Planning Survey And Design Academe Co Ltd | Tunnel lining maintenance trolley and structure damage repair method |
| CN114183163A (en) * | 2021-11-24 | 2022-03-15 | 中国建筑一局(集团)有限公司 | Device suitable for long and large tunnel multi-working-face cooperative construction |
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