CN108547619A - Underground shaft assembles recovery type prestressing force support equipment - Google Patents
Underground shaft assembles recovery type prestressing force support equipment Download PDFInfo
- Publication number
- CN108547619A CN108547619A CN201810468557.6A CN201810468557A CN108547619A CN 108547619 A CN108547619 A CN 108547619A CN 201810468557 A CN201810468557 A CN 201810468557A CN 108547619 A CN108547619 A CN 108547619A
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- Prior art keywords
- borehole wall
- sub
- prefabricated
- assembling type
- steel waist
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- 238000011084 recovery Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 194
- 239000010959 steel Substances 0.000 claims abstract description 194
- 241000357293 Leptobrama muelleri Species 0.000 claims abstract description 19
- 238000007747 plating Methods 0.000 claims description 77
- 239000000463 material Substances 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 11
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000007142 ring opening reaction Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 23
- 239000002689 soil Substances 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 13
- 238000005520 cutting process Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 5
- 230000036316 preload Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/06—Lining shafts; Linings therefor with iron or steel
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/12—Accessories for making shaft linings, e.g. suspended cradles, shutterings
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a kind of underground shafts to assemble recovery type prestressing force support equipment, including：Steel ring beam, prefabricated PC borehole wall branch protecting assembly and assembling type steel back cover；Wherein, steel ring beam is and the matched loop configuration of underground shaft top well head；Prefabricated PC borehole wall branch protecting assembly global shape be and the matched loop configuration of borehole wall shape in underground shaft；Steel ring beam following settings prefabricated PC borehole wall branch protecting assembly, prefabricated PC borehole wall branch protecting assembly are topmost fixedly connected with steel ring beam, and prefabricated PC borehole wall branch protecting assembly supporting is in underground shaft on the borehole wall；Assembling type steel back cover is fixedly connected with the bottom of prefabricated PC borehole wall branch protecting assembly, the bottom of the assembling type steel back cover vertical shaft located underground.Recycling is convenient in use convenient for assembly after use, pollution-free to the soil body, does not influence Other Engineering, and lifting construction efficiency reduces construction cost.
Description
Technical field
The present invention relates to shaft support fields more particularly to a kind of underground shaft to assemble recovery type prestressing force support equipment.
Background technology
In the constructions such as current tunnel, subway, it is required to use shield technique.In existing shield-tunneling construction, need applying
It needs to overhaul shield cutter during work, shield cutter is overhauled, is currently to be spaced on the route excavated
Inspection-pit, i.e. vertical shaft are set.But some shield inspection-pit engineerings, such as city underground engineering, limited, peripheral tubes that there are construction sites
The features such as line is intensive, surface settlement control requires height, short time limit.Existing maintenance well construction mostly uses artificial digging pile or shotcrete
It is inverse to make vertical shaft, the problems such as that there are working spaces is narrow for manually digging hole technique, and retaining wall quality is unreliable, and security risk is big；Shotcrete is inverse
There are the big pollutions of jet-anchor execution airborne dust for the practice again, construction equipment type is various, speed of application is larger by spray anchor j ob impact
The deficiencies of；The dado structure of above-mentioned inspection-pit is all the structure stress after the soil body deforms, and is in a kind of passive stress,
It is be easy to cause ground settlement, this is very unfavorable for constructing in the higher city of settlement request.Therefore, inventor has found
How to be carried out in the case where engineering closes on the more construction environment of risk source it is safe efficient, contamination-freely complete shield cutter inspection-pit
Borehole wall supporting in construction is problem to be solved.
Invention content
Based on the problems of prior art, the object of the present invention is to provide a kind of underground shaft assembly recovery types to answer in advance
Power support equipment, can be as the supporting of the underground shaft borehole wall, and convenient use assembled at the construction field (site) facilitates recycling sharp again after use
With, noresidue in the soil body will not pollute, ensure construction safety, effectively reduce Ground Settlement, reduce construction cost,
Shorten the construction time.
The purpose of the present invention is what is be achieved through the following technical solutions：
Embodiment of the present invention provides a kind of underground shaft assembly recovery type prestressing force support equipment, including：
Steel ring beam, prefabricated PC borehole wall branch protecting assembly and assembling type steel back cover；Wherein,
The steel ring beam be and the matched loop configuration of underground shaft top well head；
The prefabricated PC borehole wall branch protecting assembly global shape is matched with borehole wall shape in the underground shaft
Loop configuration；
Prefabricated PC borehole wall branch protecting assembly described in the steel ring beam following settings, the prefabricated PC borehole wall branch
Protecting assembly is topmost fixedly connected with the steel ring beam, and the prefabricated PC borehole wall branch protecting assembly supporting is perpendicular in the underground
In well on the borehole wall；
The assembling type steel back cover is fixedly connected with the bottom of the prefabricated PC borehole wall branch protecting assembly, the assembly
Formula steel back cover is located at the bottom of the underground shaft.
As seen from the above technical solution provided by the invention, underground shaft assembly recycling provided in an embodiment of the present invention
Formula prestressing force support equipment, advantage are：
By the way that steel ring beam and steel back cover is arranged, and prefabricated PC borehole wall supporting is set between steel ring beam and steel back cover
Component descends the borehole wall of vertical shaft to carry out circumferential supporting over the ground by prefabricated PC borehole wall branch protecting assembly, which is applicable in
In the supporting of the underground shaft borehole wall, energy assembled supporting applies prestressing force on the underground shaft borehole wall, to the soil body, reduces the soil body and becomes
Surface subsidence caused by shape；The strip hole of precast construction setting different directions and size, the interstructural effective connection of effective guarantee,
Improve the safety of structure itself；The support equipment due to, the on-site consolidation prefabricated using batch production that be that fabricated construction facilitates,
Supporting uses when not only facilitating construction, but also can be recycled in multiple engineerings convenient for recycling after use, and it is perpendicular to improve underground
The efficiency of well construction, reduces environmental pollution, also reduces construction cost.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the whole section signal that underground shaft provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Figure；
Fig. 2 is the steel ring beam floor map of assembly recovery type prestressing force support equipment provided in an embodiment of the present invention；
Fig. 3 is diagrammatic cross-section at the A-A in Fig. 2；
Fig. 4 is the assembling type steel back cover schematic diagram of assembly recovery type prestressing force support equipment provided in an embodiment of the present invention；
Fig. 5 is diagrammatic cross-section at the B-B in Fig. 4；
Fig. 6 is diagrammatic cross-section at the C in Fig. 4；
Fig. 7 is the assembling type steel waist rail knot that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Structure schematic diagram；
Fig. 8 is the assembling type steel waist rail that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
The structural schematic diagram of one sub- beam of arc；
Fig. 9 is diagrammatic cross-section at the D-D in Fig. 8；
Figure 10 is diagrammatic cross-section at the E-E in Fig. 8；
Figure 11 is enlarged diagram at the F in Fig. 8；
Figure 12 is diagrammatic cross-section at the F1-F1 in Figure 11；
Figure 13 is the assembling type steel waist rail that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Prestress annular to steel waist rail connecting-piece structure schematic diagram；
Figure 14 is diagrammatic cross-section at the G-G in Figure 13；
Figure 15 is diagrammatic cross-section at the H-H in Figure 13；
Figure 16 is the assembling type steel waist rail that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Prestressing force adjust connection status schematic diagram；
Figure 17 is the assembling type steel waist rail that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Prestressing force adjust status diagram；
Figure 18 is that assembling type steel waist rail provided in an embodiment of the present invention connects longitudinal connecting member schematic diagram；
Figure 19 is the pin-connected panel corrugated plating that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Structural schematic diagram；
Figure 20 is the pin-connected panel corrugated plating that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
An arc wavelet card structural schematic diagram；
Figure 21 is enlarged diagram at the I in Figure 20；
Figure 22 is the pin-connected panel corrugated plating that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Arc wavelet card structural schematic diagram；
Figure 23 is the pin-connected panel corrugated plating that conventional section provided in an embodiment of the present invention assembles recovery type prestressing force support equipment
Assembled floor map；
Figure 24 is diagrammatic cross-section at the J-J in Figure 22；
Figure 25 is diagrammatic cross-section at the K-K in Figure 22；
Figure 26 is the structural representation of the assembling type steel waist rail of shield section assembled branch protecting assembly provided in an embodiment of the present invention
Figure；
Figure 27 is the structural schematic diagram of the assembling type steel waist rail of oval ring provided in an embodiment of the present invention；
In Fig. 1 to Fig. 6：1- steel ring beams；11- doughnut-shaped steel plates；12- annular channel steels；13- bolts hole；2- prefabricated PCs
Borehole wall branch protecting assembly；21- routine section prefabricated PC borehole wall supporting sub-components；211- routine section prefabricated PC borehole wall branch
Protect the assembling type steel waist rail of sub-component；The pin-connected panel corrugated plating of 212- routine section prefabricated PC borehole wall supporting sub-components；
The longitudinal connecting member of 213- routine section prefabricated PC borehole wall supporting sub-components；The behinds 214- filler material；22- changeover portions assemble
Formula prestressing force borehole wall supporting sub-component；The assembling type steel waist rail of 221- changeover portion prefabricated PC borehole wall supporting sub-components；
The pin-connected panel corrugated plating of 222- changeover portion prefabricated PC borehole wall supporting sub-components；The 23- shield section prefabricated PC boreholes wall
Supporting sub-component；The assembling type steel waist rail of 231- shield section prefabricated PC borehole wall supporting sub-components；232- shield sections are assembled
The pin-connected panel corrugated plating of formula prestressing force borehole wall supporting sub-component；233- shield section prefabricated PC borehole wall supporting sub-components are indulged
To connector；The behind filler material of 234- shield section prefabricated PC borehole wall supporting sub-components；3- assembling type steel back covers；31-
Back cover steel plate；32- shaped steel；The first junction steel plates of 321-；The second junction steel plates of 322-；323- bolts hole；The ground 4-；5- well heads protect
Column
In Fig. 7 to Figure 12：The sub- beam of the first arcs of 211-；The sub- beam of the second arcs of 212-；The sub- beam of 213- third arcs；214-
One ring orientation prestress steel waist rail connector；215- the second ring orientation prestress steel waist rail connectors；216- third ring orientation prestress steel
Waist rail connector；2121- strip bolts hole；2122- cutting openings；2125- bolts hole；
In Figure 13 to Figure 17：2141- bolts；214- the first ring orientation prestress steel waist rail connectors；2123- shearing resistance muscle；
2127- brackets；217- voussoirs；6- jack；
In Figure 18：The assembling type steel waist rail of 211- routine section prefabricated PC borehole wall supporting sub-components；213- routine sections
The longitudinal connecting member of prefabricated PC borehole wall supporting sub-component；
In Figure 19 to Figure 25：2121- the first arc wavelet cards；2122- the second arc wavelet cards；2123- third arcs
Shape wavelet card；21211- strip holes；2121- strip nose ends；2122- connection nose ends；2121- strip nose end ribbed panels；
The very heavy card slot of 2124- strip nose ends；2125- connection nose end ribbed panels；The very heavy card slot of 2126- connection nose ends；6- jack；
In Figure 26：The sub- beam of the first arcs of 2311-；The sub- beam of the second arcs of 2312-；The sub- beam of 2313- third arcs；2314-
The sub- beam of four arcs；2315- the first ring orientation prestress steel waist rail connectors；2316- the second ring orientation prestress steel waist rail connectors；
2317- third ring orientation prestress steel waist rail connectors；The circumferential prestress steel waist rail connectors of 2318- the 4th；
In Figure 27：411,412,413,414 be respectively first, second, third and the 4th sub- beam of arc；415,416 difference
For the sub- beam of the first, second straight panel；417,418,419,420 be respectively first, second, third and the 4th prestress annular to steel waist rail
Connector；421- inner support members；4221,4222 be respectively the first, second inner support connector.
Specific implementation mode
With reference to the particular content of the present invention, technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts,
Belong to protection scope of the present invention.The content not being described in detail in the embodiment of the present invention belongs to professional and technical personnel in the field
The well known prior art.
As shown in Figure 1, the embodiment of the present invention provides a kind of underground shaft assembly recovery type prestressing force support equipment, can be used in
In the construction of the underground shafts such as shield cutter inspection-pit, including：
Steel ring beam, prefabricated PC borehole wall branch protecting assembly and assembling type steel back cover；Wherein,
The steel ring beam be and the matched loop configuration of underground shaft top well head；
The prefabricated PC borehole wall branch protecting assembly global shape is matched with borehole wall shape in the underground shaft
Loop configuration；
Prefabricated PC borehole wall branch protecting assembly described in the steel ring beam following settings, the prefabricated PC borehole wall branch
Protecting assembly is topmost fixedly connected with the steel ring beam, and the prefabricated PC borehole wall branch protecting assembly supporting is perpendicular in the underground
In well on the borehole wall；
The assembling type steel back cover is fixedly connected with the bottom of the prefabricated PC borehole wall branch protecting assembly, the assembly
Formula steel back cover is located at the bottom of the underground shaft.
As shown in Fig. 2, in above-mentioned support equipment, steel ring beam is welded by doughnut-shaped steel plate and annular channel steel；The annular
Channel steel is welded on the inner ring opening edge of the doughnut-shaped steel plate along upper, and the annular channel steel inside bottom is distributed with the formula of being linked and packed
Multiple bolts hole of prestressing force borehole wall branch protecting assembly；Steel ring beam is circular ring shape or oval ring, as long as the section with underground shaft
Shape matches.Well head guardrail is set on annular channel steel, and preferred well head guardrail uses ripple barricade.
As shown in Figures 3 to 6, in above-mentioned support equipment, assembling type steel back cover is layed in the envelope by back cover steel plate with densely covered
Multiple shaped steel above the steel plate of bottom are formed by connecting through connector and the assembling type steel waist rail of back cover steel plate periphery；I.e. each shaped steel both ends
It is connect with the assembling type steel waist rail of back cover steel plate periphery through connector, connector is by stacking and being equipped with the first, second of bolt hole
Junction steel plate is constituted, and back cover is connect through bolt with the first, second steel plate and assembling type steel waist rail.Assembling type steel back cover is circular ring shape
Or oval ring, as long as the cross sectional shape with underground shaft matches.Back cover steel plate is laid in silo bottom, can be by polylith
Back cover steel plate is assembled.
Further include：Behind filler material is filled in the prefabricated PC borehole wall branch protecting assembly and the underground shaft
Between the borehole wall, the behind filler material uses high molecular polymer filler material, setting behind filler material that can make the branch protecting assembly more
Good is bonded with the borehole wall of underground shaft, reaches better supportive.
As shown in Figure 1, in above-mentioned support equipment, prefabricated PC borehole wall branch protecting assembly includes：Conventional section assembled is pre-
Stress borehole wall supporting sub-component, changeover portion prefabricated PC borehole wall supporting sub-component and shield section prefabricated PC borehole wall branch
Protect one or more of sub-component；
If the branch protecting assembly includes simultaneously：Conventional section prefabricated PC borehole wall supporting sub-component, changeover portion assembled are pre-
Stress borehole wall supporting sub-component and shield section prefabricated PC borehole wall supporting sub-component, the then conventional section prefabricated PC borehole wall
Supporting sub-component, changeover portion prefabricated PC borehole wall supporting sub-component and shield section prefabricated PC borehole wall supporting sub-component
Distribution is arranged in underground shaft from top to bottom carries out supporting, each subgroup respectively to the borehole wall of conventional section, changeover portion and shield section
Part is sequentially connected with.
As shown in Fig. 7 to Figure 17, in above-mentioned support equipment, conventional section, shield section prefabricated PC borehole wall supporting subgroup
Part (referring to conventional section prefabricated PC borehole wall supporting sub-component and shield section prefabricated PC borehole wall supporting sub-component) is equal
Including：Multiple assembling type steel waist rails, multiple pin-connected panel corrugated platings and multiple longitudinal connecting members；Wherein,
Each assembling type steel waist rail is that (Fig. 7 illustrates with the matched loop configuration of borehole wall shape in the underground shaft
It is the assembling type steel waist rail of cirque structure, can also be the assembling type steel waist rail of oval ring structure, as long as and underground shaft
The borehole wall shape matching)；
Each pin-connected panel corrugated plating is and the matched loop configuration of borehole wall shape in the underground shaft；
The multiple assembling type steel waist rail and multiple pin-connected panel corrugated platings are connect by assembling type steel waist rail together with setting from top to bottom
The mode that is alternately arranged of one layer of pin-connected panel corrugated plating is arranged, and adjacent assembling type steel waist rail is fixedly connected with pin-connected panel corrugated plating；
Each longitudinal connecting member is connected to from top to bottom on multiple assembling type steel waist rail inner walls；
Above-mentioned this borehole wall supporting sub-component, suitable for the conventional section of shield cutter inspection-pit and the shield section borehole wall into
Row supporting, the cooperation being arranged alternately by assembling type steel waist rail and pin-connected panel corrugated plating, it is strong to form a kind of supporting power, and can spell
Behind filler material is filled after dress formula corrugated plating, promotion supporting sub-component is bonded effect with the borehole wall.
The changeover portion prefabricated PC borehole wall supporting sub-component includes：Multiple assembling type steel waist rails and multiple longitudinal directions connect
Fitting；Wherein,
Each assembling type steel waist rail is and the matched loop configuration of borehole wall shape in the underground shaft；
The multiple assembling type steel waist rail gathers from top to bottom to be arranged, and is fixedly connected between adjacent assembling type steel waist rail；
Each longitudinal connecting member is connected to from top to bottom on multiple assembling type steel waist rail inner walls.
Above-mentioned this supporting sub-component is suitable for the changeover portion between the conventional section and shield section of shield cutter inspection-pit
The borehole wall carry out supporting, due to be only multiple assembling type steel waist rails gather setting, form a kind of work for the reinforcing ring that supporting power is strong
With.
In above-mentioned support equipment, the routine section, changeover portion and shield section prefabricated PC borehole wall supporting sub-component
Assembling type steel waist rail includes：The sub- beam of multiple arcs and multiple prestress annulars are to steel waist rail connector；
Wherein, the sub- beam of the multiple arc is connected into and circumferential can be adjusted to steel waist rail connector through the multiple prestress annular
Prestressed cirque structure；Preferably, the sub- beam of each arc uses cross section to be made of rectangular square tube, in the upper and lower of square tube
Strip bolt hole is uniformly respectively set in surface, facilitates component (such as steel ring beam, pin-connected panel of connection assembling type steel waist rail upper and lower
Corrugated plating), cutting openings are equipped on the inside of the square tube of strip bolt hole corresponding position, cutting openings are by cutting one piece of square tube of removal
Side wall is formed, and cutting openings correspond to the position equipped with strip bolt hole, can be facilitated on strip bolt hole by cutting openings
It is provided as the bolt of connector (referring to Fig. 8 to Figure 10).Bracket is welded in the end of each sub- beam of arc, applies circumferential direction for placing
Prestressed jack；Voussoir is arranged in the end of each sub- beam of arc to be prevented for fixing steel waist rail after applying prestressing force
The relaxation of power；The inside of each sub- beam of arc is equipped with the shearing resistance muscle for increasing intensity.The end prepared screw-bolt hole of each sub- beam of arc, is used for
The prestress annular of steel waist rail is connected and fixed to steel waist rail connector.
It is described routine section, shield section prefabricated PC borehole wall supporting sub-component pin-connected panel corrugated plating include：
The head end of multiple arcs wavelet card and multiple corrugated plating connectors, each arc wavelet card is connection nose end,
Tail end is the connection matched strip nose end of nose end, and multiple arcs wavelet card connects in such a way that two ends are connected through multiple corrugated platings
Fitting, which connects into, circumferential to adjust prestressed cirque structure (shape is referring to Figure 19).In use, each wavelet card need to be through pre-
Next to use corrugated plating connector (be bolt) fixed again, preferably corrugated plating is pre-tightened is pre-tightened using jack.
The two sides that each arc wavelet card removes two ends are equipped with horizontal connection side, connect and uniformly divide on side
Multiple strip connecting holes are laid with, it is convenient to be connect with the assembling type steel waist rail of upper and lower (referring to Figure 22 to Figure 24).
As shown in FIG. 13 to 15, in above-mentioned support equipment, in each assembling type steel waist rail, each prestress annular is to steel waist rail
Connector is all made of the set box structure that can adjust length, it is preferred to use variable length design covers box structure, which is equipped with
Strip connecting hole, each sub- beam end of arc are equipped with strip connecting hole, and the parallel strip of multiple tracks of each sub- beam of arc connects
Hole strip connecting hole parallel with the multiple tracks of the prestress annular to steel waist rail connector is connect to match；The pin-connected panel of this structure
Steel waist rail, each sub- beam facilitate pre- next through jack then cyclic to the fixation of steel waist rail connector using prestress annular.
As shown in Figure 19 to Figure 25, in the pin-connected panel corrugated plating, the connection nose end of each arc wavelet card head end is equipped with
Multirow connecting hole disposed in parallel from top to bottom, often row connecting hole includes multiple spaced connecting holes, each arc wavelet line
The strip nose end of plate tail end is equipped with multiple elongate holes disposed in parallel from top to bottom；The initial and end end of each arc wavelet card is equal
Equipped with ribbed panel, each ribbed panel both ends are respectively equipped with jack card slot, convenient for being arranged thousand between the wavelet card of connection at two
Jin top realizes that prestressing force is adjusted.Each wavelet card of this structure type facilitates connection, and can carry out prestressing force adjusting.
In above-mentioned support equipment, conventional section, changeover portion prefabricated PC borehole wall supporting sub-component assembling type steel waist rail
In, the sub- beam of multiple arcs is three sub- beams of arc that energy beam is assembled into cirque structure；Multiple prestress annulars are connected to steel waist rail
Part is three (referring to Fig. 7)；
In the pin-connected panel corrugated plating of the routine section prefabricated PC borehole wall supporting sub-component, multiple arcs wavelet card
Three arc wavelet cards of cirque structure are assembled into for energy beam；Multiple corrugated plating connectors are three (referring to Figure 19)；
In the assembling type steel waist rail of the shield section prefabricated PC borehole wall supporting sub-component, the sub- beam of multiple arcs is energy
Beam is assembled into four sub- beams of arc of cirque structure；Multiple prestress annulars to steel waist rail connector be four (referring to Figure 26)；
In the pin-connected panel corrugated plating of the shield section prefabricated PC borehole wall supporting sub-component, multiple arcs wavelet card
Four arc wavelet cards of cirque structure are assembled into for energy beam；Multiple corrugated plating connectors be four (be not shown in figure, but
It is similar to the assembling type steel breast beam structure of Figure 26 signals).
The assembling type steel waist rail of this structure and pin-connected panel corrugated plating, in shield section in use, in the underground shaft
The whole assembling type steel waist rails and pin-connected panel corrugated plating that side and supporting retain the junction of side are removed in supporting in shield section
Seam is that neat seam of alignment is set, convenient for the sub- beam and wavelet card of partial demolition supporting sub-component when soil body backfill.
In above-mentioned support equipment, in the routine section prefabricated PC borehole wall supporting sub-component, neighbouring two
The seam stagger setting of assembling type steel waist rail, the seam stagger setting of neighbouring two pin-connected panel corrugated platings；
In the changeover portion prefabricated PC borehole wall supporting sub-component, neighbouring two assembling type steel waist rails connect
Stitch stagger setting；
The mode of above-mentioned seam stagger setting, promotes the stability of supporting.
In the shield section prefabricated PC borehole wall supporting sub-component, in branch in the shield section of the underground shaft
It is to be aligned that shield, which removes the side seam equal with whole assembling type steel waist rails of the junction of supporting reservation side and pin-connected panel corrugated plating,
Neat seam set, the seam stagger setting of two neighbouring assembling type steel waist rails of remaining position, remaining position up and down
The seam stagger setting of two adjacent pin-connected panel corrugated platings.
Above description be circular ring shape prefabricated PC borehole wall branch protecting assembly, be suitable for circular underground shaft construct
Middle use.
Referring to Figure 27, illustrate that a kind of assembling type steel waist rail of oval ring, the assembled for oval ring are answered in advance
In power borehole wall branch protecting assembly, specifically, in the branch protecting assembly, conventional section, changeover portion and shield section prefabricated PC borehole wall branch
Shield sub-component assembling type steel waist rail include：
The sub- beam of multiple arcs, the sub- beam of multiple straight panels and multiple prestress annulars are to steel waist rail connector；Wherein,
The multiple sub- beam of arc and the sub- beam of multiple straight panels are connected into through the multiple prestress annular to steel waist rail connector
Circumferential it can adjust prestressed oval ring structure；Preferably, it is side that the sub- beam of each arc and the sub- beam of each straight panel, which are all made of cross section,
The square tube of shape is made, and strip bolt hole is uniformly respectively set on the upper and lower surface of square tube, facilitate connection assembling type steel waist rail on,
The component (such as steel ring beam, pin-connected panel corrugated plating) of lower section is equipped with cutting openings on the inside of the square tube of strip bolt hole corresponding position, cuts
It cuts open mouth to be formed by cutting one piece of square tube madial wall of removal, cutting openings correspond to the position equipped with strip bolt hole, by cutting
The bolt that connector is provided as on strip bolt hole can be facilitated by cutting open mouth (referring to Fig. 8 to Figure 10).Each sub- beam of arc and each
The other structures of the sub- beam of straight panel and each sub- beam of the assembling type steel waist rail of the branch protecting assembly of above-mentioned circular ring shape are essentially identical, herein not
It repeats.
It is described routine section, shield section prefabricated PC borehole wall supporting sub-component pin-connected panel corrugated plating include：
Multiple arcs wavelet card, multiple straight panel wavelet cards and multiple corrugated plating connectors, the head end of each wavelet card
It is connection nose end, tail end is and the matched strip nose end of strip nose end, multiple arcs wavelet card and multiple straight panel wavelets
Card connects into through multiple corrugated plating connectors in such a way that two ends are connected and circumferential can adjust prestressed oval ring structure.
The two sides that each arc wavelet card and each straight panel wavelet card remove two ends are equipped with horizontal connection side,
It is uniformly distributed on connection side equipped with multiple strip connecting holes, it is convenient to be connect (referring to figure with the assembling type steel waist rail of upper and lower
22 to Figure 24).
In the assembling type steel waist rail of above-mentioned support equipment, each prestress annular is all made of to steel waist rail connector can adjust length
The set box structure of degree, the set box structure are equipped with strip connecting hole, each sub- beam end of arc and the sub- beam end of each straight panel
It is equipped with strip connecting hole, the parallel strip connecting hole of the multiple tracks strip parallel with the multiple tracks of the sub- beam of each straight panel of each sub- beam of arc
Shape connecting hole strip connecting hole parallel with the multiple tracks of the prestress annular to steel waist rail connector matches；
In the pin-connected panel corrugated plating, each wavelet card (i.e. each arc wavelet card and each straight panel wavelet card) head end
It connects nose end and is equipped with multirow connecting hole disposed in parallel from top to bottom, often row connecting hole includes multiple spaced connecting holes,
The strip nose end of each wavelet card tail end is equipped with multiple elongate holes disposed in parallel from top to bottom；The initial and end of each wavelet card
End is equipped with ribbed panel, and each ribbed panel both ends are respectively equipped with jack card slot, convenient for being set between the wavelet card of connection at two
Jack is set, realizes that prestressing force is adjusted.Each wavelet card of this structure type facilitates connection, and can carry out prestressing force tune
Section.
In above-mentioned support equipment, in each assembling type steel waist rail, the sub- beam of multiple arcs is that energy beam is assembled into two semicircular ring knots
Six sub- beams of arc of structure；Multiple sub- beams of straight panel are two straight panel between being connected in parallel at described two semicircle ring structures
Beam；Multiple prestress annulars to steel waist rail connector be two；
In the pin-connected panel corrugated plating, multiple arcs wavelet card is six arcs that energy beam is assembled into two semicircle ring structures
Shape wavelet card；Multiple straight panel wavelet cards are two straight panel wavelet lines between being connected in parallel at described two semicircle ring structures
Plate, each corrugated plating connector are all made of bolt.
Above-mentioned support equipment further includes：Inner support member, both ends are connect with two sub- beams of straight panel being oppositely arranged respectively, branch
Support is between two opposite sub- beams of straight panel.It is interior convenient for from the assembling type steel waist rail of the supporting sub-component of interior stretching oval ring
Support element is multiple, and each inner support member is supported in one of steel waist rail.
In above-mentioned support equipment, in the routine section prefabricated PC borehole wall supporting sub-component, neighbouring two
The seam stagger setting of assembling type steel waist rail, the seam stagger setting of neighbouring two pin-connected panel corrugated platings；
In the changeover portion prefabricated PC borehole wall supporting sub-component, neighbouring two assembling type steel waist rails connect
Stitch stagger setting；
In the shield section prefabricated PC borehole wall supporting sub-component, in branch in the shield section of the underground shaft
It is to be aligned that shield, which removes the side seam equal with whole assembling type steel waist rails of the junction of supporting reservation side and pin-connected panel corrugated plating,
Neat seam set, the seam stagger setting of two neighbouring assembling type steel waist rails of remaining position, remaining position up and down
The seam stagger setting of two adjacent pin-connected panel corrugated platings.
It is recognised that in each section of above-mentioned support equipment of oval ring supporting sub-component, straight panel component (such as straight panel
Beam, straight panel wavelet card) it can realize the effect for adjusting oval ring length using the component of different length, adapt to different
Oval ring underground shaft.
In above-mentioned support equipment, either in cirque structure or ellipsoidal structure, conventional section, changeover portion and shield
In section prefabricated PC borehole wall supporting sub-component, connector is connected to six longitudinally spaced assembling type steel waist rails longitudinally in each
Web on, it is preferred that longitudinal connecting member use channel steel.
In above-mentioned support equipment, one of steel waist rail forms a Pin supporting construction bodies, a Pin supporting construction with corrugated plating together
The height of body is 0.5~0.75 meter；It is known that this height is preferably, the height that can also be arranged as required to the two is
Other height, as long as ensureing that support, installation, dismounting and recycling are convenient.
The embodiment of the present invention is specifically described in further detail below.
The embodiment of the present invention provides underground shaft and assembles recovery type prestressing force support equipment, can be used in underground shaft as well
The supporting of wall, such as by taking shield cutter inspection-pit as an example, the support equipment is using steps are as follows：
Step 1) is after the completion of the well head collar tie beam of inspection-pit pours, assembled prefabricated steel ring beam and guardrail.Then carry out the earthwork
First of steel waist rail is set up after excavation, is attached waist rail and prefabricated steel ring beam with connector (such as bolt), and preload piece is by waist
Beam is strutted and is put in place, and is bolted connector and steel waist rail with bolt, and by the connection bolt of steel waist rail and prefabricated collar tie beam
Fastening.
After step 2) sets up first of steel waist rail, the soil body is excavated, per Pin cutting depth 0.5m, sets up one layer of ripple in time
Plate is strutted after connecting it with first of steel waist rail with preload piece, is fastenedly connected corrugated plating with connector, and by corrugated plating
It is bolted with first of steel waist rail.
Second steel waist rail is connect by step 3) with connector with corrugated plating, and preload piece struts steel waist rail and is put in place,
Connector and steel waist rail are bolted with bolt, and steel waist rail and corrugated plating fastening are bolted.
The subsequent work progress of step 4) repeats step 2), step 3), step 4), up to support equipment supporting to shaft bottom.
Step 5) is laid with back cover steel plate, and the multiple shaped steel of close paving on back cover steel plate again in shaft bottom, by multiple shaped steel both ends with
Bottom one of steel waist rail is bolted connection.
It should be noted in above structure assembly Bracing Process：It (1), (can at interval of a distance according to formation condition
To be 1.5m, 2m or other distances) primary behind filler material is noted behind in corrugated plating；(2) per 3m longitudinal connecting member of connection.
It is convenient in corrugated plating back-grouting using corrugated plating in support equipment of the present invention, such as may be used every 1.5m or
2m injects a macromolecule polymer material behind in corrugated plating, to fill corrugated plating behind gap.The four of monocycle corrugated plating
It is each on a ripple plate to reserve an injected hole, or in such a way that scene is punched.
The support equipment of the present invention, convenient that supporting is carried out to the borehole wall of underground shaft with assembly method, convenient, energy when use
Simplify the construction process of underground shaft, lifting construction speed, and after the completion of constructing, this support equipment is recycled and followed after facilitating dismounting
Ring reuses, which combines prestressing force support technology and backfill the mode of intumescent material behind, effectively inhibits soil
Body deforms, and reduces surface subsidence.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (13)
1. a kind of underground shaft assembles recovery type prestressing force support equipment, which is characterized in that including：
Steel ring beam, prefabricated PC borehole wall branch protecting assembly and assembling type steel back cover；Wherein,
The steel ring beam be and the matched loop configuration of underground shaft top well head；
The prefabricated PC borehole wall branch protecting assembly global shape be and the matched annular of borehole wall shape in the underground shaft
Structure；
Prefabricated PC borehole wall branch protecting assembly described in the steel ring beam following settings, the prefabricated PC borehole wall supporting group
Part is topmost fixedly connected with the steel ring beam, and the prefabricated PC borehole wall branch protecting assembly supporting is in the underground shaft
On the borehole wall；
The assembling type steel back cover is fixedly connected with the bottom of the prefabricated PC borehole wall branch protecting assembly, the assembling type steel
Back cover is located at the bottom of the underground shaft.
2. underground shaft according to claim 1 assembles recovery type prestressing force support equipment, which is characterized in that the steel ring
Beam is welded by doughnut-shaped steel plate and annular channel steel；The annular channel steel is welded on the inner ring opening edge edge of the doughnut-shaped steel plate
On, the annular channel steel inside bottom is distributed with the multiple bolts hole for the formula prestressing force borehole wall branch protecting assembly that is linked and packed；
The assembling type steel back cover by back cover steel plate and gathering be layed in both ends above the back cover steel plate through connector respectively with
Multiple shaped steel of the prefabricated PC borehole wall branch protecting assembly connection are constituted；
Further include：Behind filler material is filled in the prefabricated PC borehole wall branch protecting assembly and the borehole wall in the underground shaft
Between, the behind filler material uses high molecular polymer filler material.
3. underground shaft according to claim 1 or 2 assembles recovery type prestressing force support equipment, which is characterized in that described
Prefabricated PC borehole wall branch protecting assembly includes：
Conventional section prefabricated PC borehole wall supporting sub-component, changeover portion prefabricated PC borehole wall supporting sub-component and shield section
One or more of prefabricated PC borehole wall supporting sub-component.
4. underground shaft according to claim 3 assembles recovery type prestressing force support equipment, which is characterized in that
The routine section, shield section prefabricated PC borehole wall supporting sub-component include：
Multiple assembling type steel waist rails, multiple pin-connected panel corrugated platings and multiple longitudinal connecting members；Wherein,
Each assembling type steel waist rail is and the matched loop configuration of borehole wall shape in the underground shaft；
Each pin-connected panel corrugated plating is and the matched loop configuration of borehole wall shape in the underground shaft；
The multiple assembling type steel waist rail and multiple pin-connected panel corrugated platings connect one layer by assembling type steel waist rail together with setting from top to bottom
The mode that is alternately arranged of pin-connected panel corrugated plating is arranged, and adjacent assembling type steel waist rail is fixedly connected with pin-connected panel corrugated plating；
Each longitudinal connecting member is connected to from top to bottom on multiple assembling type steel waist rail inner walls；
The changeover portion prefabricated PC borehole wall supporting sub-component includes：
Multiple assembling type steel waist rails and multiple longitudinal connecting members；Wherein,
Each assembling type steel waist rail is and the matched loop configuration of borehole wall shape in the underground shaft；
The multiple assembling type steel waist rail gathers from top to bottom to be arranged, and is fixedly connected between adjacent assembling type steel waist rail；
Each longitudinal connecting member is connected to from top to bottom on multiple assembling type steel waist rail inner walls.
5. underground shaft according to claim 4 assembles recovery type prestressing force support equipment, which is characterized in that
The routine section, changeover portion and shield section prefabricated PC borehole wall supporting sub-component assembling type steel waist rail include：
The sub- beam of multiple arcs and multiple prestress annulars are to steel waist rail connector；Wherein,
The multiple sub- beam of arc connected into steel waist rail connector through the multiple prestress annular circumferential can adjust it is prestressed
Cirque structure；
It is described routine section, shield section prefabricated PC borehole wall supporting sub-component pin-connected panel corrugated plating include：
The head end of multiple arcs wavelet card and multiple corrugated plating connectors, each arc wavelet card is connection nose end, tail end
To connect the matched strip nose end of nose end, multiple arcs wavelet card is in such a way that two ends are connected through multiple corrugated plating connectors
Connecting into circumferential can adjust prestressed cirque structure.
6. underground shaft according to claim 5 assembles recovery type prestressing force support equipment, which is characterized in that the assembly
In formula steel waist rail, each prestress annular is all made of the set box structure that can adjust length to steel waist rail connector, on the set box structure
Equipped with strip connecting hole, each sub- beam end of arc is equipped with strip connecting hole, the parallel strip of multiple tracks of each sub- beam of arc
Shape connecting hole strip connecting hole parallel with the multiple tracks of the prestress annular to steel waist rail connector matches；
In the pin-connected panel corrugated plating, the connection nose end of each arc wavelet card head end is equipped with multirow disposed in parallel from top to bottom
Connecting hole, often row connecting hole includes multiple spaced connecting holes, the strip nose end of each arc wavelet card tail end be equipped with from
Multiple elongate holes disposed in parallel under；The initial and end end of each arc wavelet card is equipped with ribbed panel, each ribbed panel both ends
It is respectively equipped with jack card slot.
7. underground shaft according to claim 5 or 6 assembles recovery type prestressing force support equipment, which is characterized in that
It is described routine section, changeover portion prefabricated PC borehole wall supporting sub-component assembling type steel waist rail in, the sub- beam of multiple arcs
Three sub- beams of arc of cirque structure are assembled into for energy beam；Multiple prestress annulars to steel waist rail connector be three；
In the pin-connected panel corrugated plating of the routine section prefabricated PC borehole wall supporting sub-component, multiple arcs wavelet card is energy
Beam is assembled into three arc wavelet cards of cirque structure；Multiple corrugated plating connectors use bolt；
In the assembling type steel waist rail of the shield section prefabricated PC borehole wall supporting sub-component, the sub- beam of multiple arcs is can beam spelling
Dress up four sub- beams of arc of cirque structure；Multiple prestress annulars to steel waist rail connector be four；
In the pin-connected panel corrugated plating of the shield section prefabricated PC borehole wall supporting sub-component, multiple arcs wavelet card is energy
Beam is assembled into four arc wavelet cards of cirque structure；Multiple corrugated plating connectors are four.
8. assembling recovery type prestressing force support equipment according to claim 4 to 6 any one of them underground shaft, feature exists
In,
In the routine section prefabricated PC borehole wall supporting sub-component, the seam of neighbouring two assembling type steel waist rails is wrong
It opens up and sets, the seam stagger setting of neighbouring two pin-connected panel corrugated platings；
In the changeover portion prefabricated PC borehole wall supporting sub-component, the seam of neighbouring two assembling type steel waist rails is wrong
It opens；
In the shield section prefabricated PC borehole wall supporting sub-component, torn open in supporting in the shield section of the underground shaft
Except side and supporting retain whole assembling type steel waist rails of the junction of side and the equal seam of pin-connected panel corrugated plating be aligned it is neat
Seam and set, the seam stagger setting of two neighbouring assembling type steel waist rails of remaining position, remaining position it is neighbouring
Two pin-connected panel corrugated platings seam stagger setting.
9. underground shaft according to claim 4 assembles recovery type prestressing force support equipment, which is characterized in that
The routine section, changeover portion and shield section prefabricated PC borehole wall supporting sub-component assembling type steel waist rail include：
The sub- beam of multiple arcs, the sub- beam of multiple straight panels and multiple prestress annulars are to steel waist rail connector；Wherein,
The multiple sub- beam of arc and the sub- beam of multiple straight panels are connected into through the multiple prestress annular to steel waist rail connector can ring
To the prestressed oval ring structure of adjusting；
It is described routine section, shield section prefabricated PC borehole wall supporting sub-component pin-connected panel corrugated plating include：
Multiple arcs wavelet card, multiple straight panel wavelet cards and multiple corrugated plating connectors, the head end of each wavelet card are
Nose end is connected, tail end is and the matched strip nose end of strip nose end, multiple arcs wavelet card and multiple straight panel wavelet cards
It connects into through multiple corrugated plating connectors in such a way that two ends are connected and circumferential can adjust prestressed oval ring structure.
10. underground shaft according to claim 9 assembles recovery type prestressing force support equipment, which is characterized in that
In the assembling type steel waist rail, each prestress annular is all made of the set box structure that can adjust length to steel waist rail connector,
The set box structure is equipped with strip connecting hole, and each sub- beam end of arc and the sub- beam end of each straight panel are equipped with strip company
Connect hole, the parallel strip connecting hole of multiple tracks of each sub- beam of arc and the parallel strip connecting hole of multiple tracks of the sub- beam of each straight panel are and institute
The parallel strip connecting hole of multiple tracks for stating prestress annular to steel waist rail connector matches；
In the pin-connected panel corrugated plating, the connection nose end of each wavelet card head end is equipped with multirow connection disposed in parallel from top to bottom
Hole, often row connecting hole includes multiple spaced connecting holes, and the strip nose end of each wavelet card tail end is equipped with puts down from top to bottom
Multiple elongate holes of row setting；The initial and end end of each wavelet card is equipped with ribbed panel, and each ribbed panel both ends are respectively equipped with very heavy
Push up card slot.
11. underground shaft according to claim 9 or 10 assembles recovery type prestressing force support equipment, which is characterized in that institute
It states in assembling type steel waist rail, the sub- beam of multiple arcs is six sub- beams of arc that energy beam is assembled into two semicircle ring structures；It is multiple straight
Plank beam is two sub- beams of straight panel between being connected in parallel at described two semicircle ring structures；Multiple prestress annulars connect to steel waist rail
Fitting is two；
In the pin-connected panel corrugated plating, multiple arcs wavelet card is six arc that energy beam is assembled into two semicircle ring structures
Corrugated plating；Multiple straight panel wavelet cards be connected in parallel at multiple arcs wavelet card composition described two semicircle ring structures it
Between two straight panel wavelet cards；Multiple corrugated plating connectors are all made of bolt.
12. underground shaft according to claim 11 assembles recovery type prestressing force support equipment, which is characterized in that also wrap
It includes：
Inner support member, both ends are connect with two sub- beams of straight panel being oppositely arranged respectively, are supported on two opposite sub- beams of straight panel
Between.
13. the underground shaft according to claim 4,9 or 10 assembles recovery type prestressing force support equipment, which is characterized in that
In the routine section prefabricated PC borehole wall supporting sub-component, the seam of neighbouring two assembling type steel waist rails is wrong
It opens up and sets, the seam stagger setting of neighbouring two pin-connected panel corrugated platings；
In the changeover portion prefabricated PC borehole wall supporting sub-component, the seam of neighbouring two assembling type steel waist rails is wrong
It opens up and sets；
In the shield section prefabricated PC borehole wall supporting sub-component, torn open in supporting in the shield section of the underground shaft
Except side and supporting retain whole assembling type steel waist rails of the junction of side and the equal seam of pin-connected panel corrugated plating be aligned it is neat
Seam and set, the seam stagger setting of two neighbouring assembling type steel waist rails of remaining position, remaining position it is neighbouring
Two pin-connected panel corrugated platings seam stagger setting.
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| CN110671114A (en) * | 2019-11-01 | 2020-01-10 | 中国地质大学（北京） | Recovery type circular shaft supporting device and method |
| CN111963174A (en) * | 2020-07-08 | 2020-11-20 | 淮北矿业股份有限公司 | Process for repairing coal chute hole by open caisson method |
| CN112302052A (en) * | 2020-11-06 | 2021-02-02 | 中铁工程装备集团有限公司 | Vertical shaft construction system and construction method thereof |
| CN112502714A (en) * | 2020-10-27 | 2021-03-16 | 中建三局基础设施建设投资有限公司 | Assembled shaft barrel structure and design and construction method |
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| CN111963174A (en) * | 2020-07-08 | 2020-11-20 | 淮北矿业股份有限公司 | Process for repairing coal chute hole by open caisson method |
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