CN114165071A - UHPC (ultra high performance polycarbonate) reinforcement method for underground cavern - Google Patents
UHPC (ultra high performance polycarbonate) reinforcement method for underground cavern Download PDFInfo
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- CN114165071A CN114165071A CN202111649426.6A CN202111649426A CN114165071A CN 114165071 A CN114165071 A CN 114165071A CN 202111649426 A CN202111649426 A CN 202111649426A CN 114165071 A CN114165071 A CN 114165071A
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- uhpc
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- underground cavern
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/04—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate against air-raid or other war-like actions
- E04H9/10—Independent shelters; Arrangement of independent splinter-proof walls
- E04H9/12—Independent shelters; Arrangement of independent splinter-proof walls entirely underneath the level of the ground, e.g. air-raid galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to the technical field of urban underground civil air defense engineering construction, in particular to a UHPC (ultra high performance concrete) reinforcing method for an underground cavern. The invention has the advantages that: the jet grouting reinforcement method can be directly used for jet reinforcement of walls, crown arches (or top plates) and beams of underground air-raid shelters, the reinforcement thickness is only 30-50mm, formwork erecting, net hanging or other auxiliary measures are not needed, and rapid reinforcement of the air-raid shelters can be realized; and the construction equipment is small and exquisite, light, and trafficability characteristic is good, can estimate the quick construction that adapts to narrow and small space.
Description
Technical Field
The invention relates to the technical field of urban underground civil air defense engineering construction, in particular to a UHPC (ultra high performance concrete) reinforcing method for an underground cavern, which is particularly applied to reinforcing of an old air-raid shelter in a city.
Background
In the early days, civil air defense engineering refers to underground works which are independently built in the sixties and seventies of the 20 th century to ensure the shelter of war personnel and materials, civil air defense command and medical rescue, and is in the superior geographical position of cities. With the continuous development of urban construction and the continuous development of underground space, the underground space has a commercial development and utilization value which cannot be underestimated.
However, as the construction time of the civil air defense projects is long, the building materials are gradually aged, the structural performance is gradually reduced, the use values of the protective capability and the like are weakened, the damage is caused to facilities such as aboveground buildings, roads and the like, and the healthy development of the civil air defense industry is always difficult.
In order to further develop the civil air defense function or social function of these civil air defense projects, it is necessary to reinforce them. At present, the reinforcement of the underground old air-raid shelter mainly comprises the following centralized methods:
(1) the concrete is poured and reinforced by planting bars, namely, the original concrete of the air-raid shelter is drilled, glue is injected into the holes, the steel bars are planted, so that the base concrete and the steel bars are bonded together through structural glue, then the concrete with matched strength is poured by erecting a formwork, and the new and the old reinforced concrete are connected into a whole. The method is generally used for reinforcing the wall.
(2) And (3) carbon fiber reinforcement, namely, a certain amount of carbon fiber cloth or carbon fiber plates are stuck to the bottoms of the plates and the beams. This method is generally used for the reinforcement of roofs or beams.
(3) The compaction additional vibration concrete pouring method is commonly called as a compaction method, namely, the lateral plates are transversely tightened and pushed to extrude the concrete into the reinforcement cage and form the section of a member. The construction method comprises the following steps: a. the method comprises the following steps of (1) snapping lines on the lower surface of an existing component, and lofting out a dimension line of the component to be poured, an outer side line of an extrusion plate and a position line of an air outlet pipe which are used for extrusion control; b. erecting a material collecting platform; c. installing an air outlet pipe; d. feeding (the volume is controlled to be slightly more than 3 percent to 5 percent); e. installing an extrusion plate (at the moment, a grout discharging hole is blocked tightly firstly) and a split bolt; f. manually pre-pushing; g. installing a backing plate, and rotating a nut to extrude; h. when the concrete extrudes slurry from the joints of the templates, the wooden plug in the slurry discharge hole is pulled out, and the electric hammer is inserted to stir and vibrate in a fan shape; i. continuously extruding and vibrating to the control line outside the ejected template on the lower surface of the original component; j. tightly plugging the air outlet pipe orifice and tightly plugging the slurry discharge hole by using a wood plug; k. and (4) disassembling the mold according to age, and pulling out the split bolt (the split bolt can be repeatedly used).
When the method is adopted for strengthening the air-raid shelter, the following defects exist:
(1) the reinforcing of the wall body can be only carried out by the steel bar planting pouring concrete reinforcing, the reinforcing of a top plate or a top arch part cannot be realized, the formwork pouring cannot be carried out on the special-shaped end face and the narrow space, the limitation is large, and the concrete pouring and curing time is long;
(2) the carbon fiber reinforcement method is suitable for reinforcing the top plate and the beam, but is not suitable for large-area use due to high price.
(3) The compaction additional vibration concrete pouring method can be used for reinforcing the top plate, but reinforcing the air-raid shelter mainly in a top arch form or a special-shaped section is difficult to support a formwork, complex in process, multiple in equipment and long in construction period, and is difficult to perform in an old air-raid shelter with a narrow space.
In summary, the existing method for reinforcing urban underground air raid shelters mainly adopts the methods of steel bar planting concrete pouring, carbon fiber reinforcing and compaction additional vibration concrete pouring, and has certain limitations, and the problems of complex process, multiple equipment, long construction period, high construction cost, incapability of realizing one-time reinforcing and the like exist.
Disclosure of Invention
The invention aims to provide a UHPC reinforcing method for an underground cavern according to the defects of the prior art, UHPC rapid injection reinforcing is carried out on a reinforcing base layer of the underground cavern through UHPC injection equipment, and the prepared injected UHPC reinforcing layer has the characteristics of thin layer, high strength and high durability, can be rapidly solidified and hardened, is a structural layer and a protective layer, and can realize one-time rapid reinforcing of an inner structure of an air-raid shelter.
The purpose of the invention is realized by the following technical scheme:
a UHPC reinforcing method of an underground cavern is characterized by comprising the following steps: and arranging UHPC (ultra high performance concrete) spraying equipment, enabling a spraying port of the UHPC spraying equipment to be positioned inside the underground cavern, spraying UHPC with a certain thickness to the surface of a reinforced base layer of the underground cavern by using the UHPC spraying equipment to form a sprayed UHPC reinforced layer on the surface of the reinforced base layer, wherein the sprayed UHPC reinforced layer is a structural protective layer and a structural reinforced layer.
The component proportion of the UHPC injection is as follows: 100 parts of cement, 21-35 parts of fly ash microbeads, 8-15 parts of silica fume, 180 parts of ground quartz sand, 2-15 parts of expanding agent, 0.6-1.5 parts of water reducing agent, 0.1-0.2 part of defoaming agent, 12-30 parts of steel fiber or 3-8 parts of synthetic fiber and 23-30 parts of water.
The mechanical property indexes of the sprayed UHPC are as follows: the compressive strength is more than or equal to 100MPa, the breaking strength is more than or equal to 12MPa, and the tensile strength is more than or equal to 5 MPa; the spraying thickness is 30-50 mm.
And embedding a reinforcing steel bar head on the surface of a reinforcing base layer of the underground cavern, wherein the reinforcing steel bar head extends out of the reinforcing base layer, and the thickness of the sprayed UHPC reinforcing layer is controlled by taking the reinforcing steel bar head as an elevation.
The reinforcing steel bar heads are arranged in quincuncial piles and embedded in the surface of the reinforcing base layer.
The UHPC spraying equipment comprises a stirring and pumping integrated machine, an accelerator pump and an air compressor, wherein the stirring and pumping integrated machine is used for stirring and pumping UHPC, the air compressor is used for providing spraying pressure of the UHPC, and the accelerator pump is used for simultaneously pumping the accelerator for spraying the UHPC.
The adjacent position refers to the position which is arranged on the ground adjacent to the underground chamber and enables the spray opening of the UHPC spraying equipment to enter the inside of the underground chamber through the connecting channel of the underground chamber; or disposed within the underground cavern.
And before spraying the UHPC reinforcing layer, spraying and wetting the surface of the reinforcing base layer.
And after the spraying of the UHPC reinforcing layer is finished, spraying, humidifying and maintaining the surface of the UHPC reinforcing layer.
The invention has the advantages that:
(1) the sprayed UHPC with ultrahigh strength and ultrahigh toughness is adopted for reinforcement, so that the rapid spraying reinforcement can be realized on various reinforced base layers such as walls, crown arches (or top plates) and beams in underground caverns;
(2) the construction equipment has small volume, convenient disassembly and assembly and movement and small occupied area, and is suitable for the jet reinforcement construction of the air-raid shelters in various areas such as living, business, traffic-intensive areas and the like;
(3) spraying UHPC for structural repair and reinforcement, wherein the UHPC is a structural protective layer and a structural reinforcing layer;
(4) spraying the UHPC layer provides a very low permeability finish, possibly without the addition of a protective coating;
(5) when the UHPC is sprayed for reinforcement, because the UHPC has good tensile strength, a steel bar or a steel bar mesh can not be used, the construction process is greatly simplified, and the construction efficiency is improved;
(6) the thickness of the sprayed UHPC reinforcing layer is only 30-50mm, so that the construction cost is reduced, the effective space in the air-raid shelter is reserved to the maximum extent, and the subsequent development and use of the air-raid shelter after the reinforcement are facilitated.
Drawings
FIG. 1 is a schematic diagram of a structure in which the present invention is practiced;
FIG. 2 is a schematic diagram of a structure in which the present invention is implemented;
fig. 3 is a schematic diagram of the thicknesses of the pre-buried steel bar heads and the spraying layer according to the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-3, the labels 1-14 are respectively shown as: the anti-cavitation device comprises an anti-cavitation hole 1, a ground building 2, a spraying UHPC reinforcing layer 3, a stirring and pumping integrated machine 4, a concrete pipeline 5, an air compressor 6, a compressed air pipe 7, an accelerator pump 8, an accelerator pipe 9, a nozzle 10, an anti-cavitation channel 11, a ground 12, a reinforcing base layer 13 and an embedded reinforcing steel bar head 14.
The first embodiment is as follows: as shown in fig. 1, the UHPC reinforcement method for underground caverns in the present embodiment is used for reinforcing an air-raid shelter 1, the air-raid shelter 1 is located below a ground building 2, and the air-raid shelter 1 has an air-raid shelter channel 11 communicated with the ground. The present embodiment can reinforce the air-raid shelter 1 without affecting the ground structure 2.
Specifically, the reinforcement method in the present embodiment includes the following steps:
1) a UHPC spraying device is arranged on the ground 12 near the air-raid shelter channel 11 of the air-raid shelter 1.
UHPC injection equipment includes stirring pumping all-in-one 4, air compressor machine 6 and accelerator pump 8, and wherein stirring pumping all-in-one 4 is used for spouting stirring and the pumping of UHPC, and air compressor machine 6 is used for providing the injection pressure of UHPC, and accelerator pump 8 is used for pumping the accelerator that sprays UHPC simultaneously.
In this embodiment, the stirring and pumping integrated machine 4 can directly integrate the accelerator pump 8, and simultaneously pump the UHPC mixture and the accelerator, and the flow rate is adjustable. Stirring pumping all-in-one 4 and air compressor machine 6 all have characteristics such as small, the removal is convenient, but quick assembly disassembly to stirring pumping flow is big, is applicable to the quick jet construction under the narrow and small environment.
2) The concrete pipeline 5, the accelerator pipe 9 and the compressed air pipe 7 are communicated into the air-raid shelter 1 through an air-raid shelter channel 11 and are connected with a nozzle 10. Wherein, concrete line 5 is connected with stirring pump sending all-in-one 4, and accelerator pipe 9 is connected with accelerator pump 8, and compressed air pipe 7 is connected with air compressor machine 6.
3) Chiseling the surface of a reinforcing base layer to be reinforced in the air-raid shelter 1 until a new surface of the aggregate is exposed, and then chiseling the surface; the loose aggregate, floating block, scum and powder on the surface are removed, and the concrete is washed (blown) by clean pressure water or compressed air, so that the adverse effect of the loose material on the reinforcing quality is avoided.
4) As shown in fig. 3, pre-buried reinforcing bars 14 are embedded in the surface of the reinforcing base 13 as elevations for controlling the thickness of the sprayed UHPC reinforcing layer. The exposed length of the embedded steel bar heads 14 is generally 30-50mm, and the specific length is determined according to the actual reinforcement design thickness. In this embodiment, the number of reinforcing layers is 1-5/m on the reinforcing base layer 132The pre-embedded steel bar heads 14 are arranged in a quincuncial pile shape; forming an effective thickness control grid plane from point-line-surface by the embedded pre-buried steel bar heads 14, spraying UHWhen PC construction is carried out, the injection layer covers the pre-buried steel bar heads 14, namely the pre-buried steel bar heads reach the designed and controlled thickness.
5) The surface of the reinforcing base layer 13 is sprayed with moisture and, at the same time, it is ensured that the surface thereof is sufficiently wetted without running water.
6) And (3) stirring the UHPC premixed powder, water and fiber in a stirrer of the stirring and pumping integrated machine 4 according to a set proportion for a certain time, for example, 3-5min, then discharging the mixture into a hopper of a conveying pump, starting an air compressor 6, an accelerator pump 8 and a concrete conveying pump of the stirring and pumping integrated machine 4 according to the above, adjusting the proportion of the accelerator and the UHPC according to the on-site working condition, and performing UHPC spraying reinforcement construction.
In this example, the component distribution ratio for injecting UHPC was: 100 parts of cement, 21-35 parts of fly ash microbeads, 8-15 parts of silica fume, 180 parts of ground quartz sand, 2-15 parts of expanding agent, 0.6-1.5 parts of water reducing agent, 0.1-0.2 part of defoaming agent, 12-30 parts of steel fiber or 3-8 parts of synthetic fiber and 23-30 parts of water.
The pumping performance of the UHPC mixture is greatly improved, the working time of the UHPC is prolonged, the spraying construction of the UHPC mixture is facilitated, and particularly when the channel of the air-raid shelter channel 11 is long, the reinforcing quality of the sprayed UHPC can be effectively ensured; in addition, when an emergency occurs on the site, the site can be allowed to have time to deal with the situation and then follow-up construction can be carried out.
The mechanical property indexes of the sprayed UHPC are as follows: the compressive strength is more than or equal to 100MPa, the breaking strength is more than or equal to 12MPa, and the tensile strength is more than or equal to 5 MPa; because of the characteristics of ultrahigh strength, ultrahigh toughness and ultrahigh durability of UHPC, the thickness of the UHPC is generally 30-50mm when the UHPC is subjected to spray reinforcement so as to form a thinner reinforced layer.
The accelerator can be an alkali-free accelerator, and has the functions of reducing dust, reducing resilience during spraying operation and stably increasing strength of sprayed UHPC.
7) And (3) carrying out spray UHPC reinforcement construction, synchronously pumping the spray UHPC and the accelerator, delivering compressed air to a nozzle 10 through an air compressor 6, uniformly mixing the compressed air with the spray UHPC and the alkali-free accelerator, spraying the mixture to the surface of a reinforced base layer 13, and quickly condensing and hardening to form a spray UHPC reinforced layer 3.
In this embodiment, the surface of the reinforced base layer 13 is provided with pre-embedded steel bar heads 14, and the pre-embedded steel bar heads 14 can be used for controlling the elevation of the thickness of the sprayed UHPC reinforced layer 3, and can also improve the integrity and the shear resistance of the sprayed UHPC reinforced layer 3 and the reinforced base layer 13, so as to further improve the load bearing capacity of the reinforced base layer 13.
The sprayed UHPC reinforced layer 3 is a structural protective layer for reinforcing the base layer 13 and a structural reinforced layer for reinforcing the base layer 13, wherein the structural protective layer means that the existing reinforced base layer 13 is protected inside the sprayed UHPC reinforced layer 3, and can completely avoid various damages such as late groundwater erosion, acid erosion and the like, and the structural reinforced layer means that the sprayed UHPC reinforced layer 3 has the characteristic of ultrahigh mechanical property, and when the mechanical property of the sprayed UHPC reinforced layer is obviously greater than that of the existing reinforced base layer 13, after the sprayed UHPC reinforced layer and the reinforced base layer 13 are connected into a whole through the embedded connector 14, the sprayed UHPC reinforced layer and the reinforced base layer 13 can be stressed simultaneously, so that the reinforcement at the position is realized.
During the spraying construction, the nozzle 10 and the reinforced base layer 13 as the working surface are kept vertical as much as possible, and the distance is controlled to be 0.3-0.5 m.
8) After the spraying is finished, the surface of the reinforced base layer 13 is sprayed and humidified for maintenance, and the maintenance time is about 3 days.
Example two: as shown in fig. 2, the difference between the first embodiment and the second embodiment is: the floor area of the air-raid shelter 1 in the embodiment is larger than that of the air-raid shelter in the first embodiment; therefore, in this embodiment, the UHPC injection equipment is transported into the air-raid shelter 1 to perform injection reinforcement work thereof. Compared with the first embodiment, because the pumping distance of the spraying UHPC in the first embodiment is relatively short, the embodiment can more accurately control the strengthening operation process of the spraying UHPC under the condition of meeting the operation space requirement, and further ensure the strengthening quality of the spraying UHPC.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, they are not to be considered repeated herein.
Claims (9)
1. A UHPC reinforcing method of an underground cavern is characterized by comprising the following steps: and arranging UHPC (ultra high performance concrete) spraying equipment, enabling a spraying port of the UHPC spraying equipment to be positioned inside the underground cavern, spraying UHPC with a certain thickness to the surface of a reinforced base layer of the underground cavern by using the UHPC spraying equipment to form a sprayed UHPC reinforced layer on the surface of the reinforced base layer, wherein the sprayed UHPC reinforced layer is a structural protective layer and a structural reinforced layer.
2. The UHPC strengthening method for the underground cavern as recited in claim 1, wherein: the component proportion of the UHPC injection is as follows: 100 parts of cement, 21-35 parts of fly ash microbeads, 8-15 parts of silica fume, 180 parts of ground quartz sand, 2-15 parts of expanding agent, 0.6-1.5 parts of water reducing agent, 0.1-0.2 part of defoaming agent, 12-30 parts of steel fiber or 3-8 parts of synthetic fiber and 23-30 parts of water.
3. The UHPC strengthening method for the underground cavern as recited in claim 2, wherein: the mechanical property indexes of the sprayed UHPC are as follows: the compressive strength is more than or equal to 100MPa, the breaking strength is more than or equal to 12MPa, and the tensile strength is more than or equal to 5 MPa; the spraying thickness is 30-50 mm.
4. The UHPC strengthening method for the underground cavern as recited in claim 1, wherein: and embedding a reinforcing steel bar head on the surface of a reinforcing base layer of the underground cavern, wherein the reinforcing steel bar head extends out of the reinforcing base layer, and the thickness of the sprayed UHPC reinforcing layer is controlled by taking the reinforcing steel bar head as an elevation.
5. The UHPC strengthening method of an underground cavern as recited in claim 4, wherein: the reinforcing steel bar heads are arranged in quincuncial piles and embedded in the surface of the reinforcing base layer.
6. The UHPC strengthening method for the underground cavern as recited in claim 1, wherein: the UHPC spraying equipment comprises a stirring and pumping integrated machine, an accelerator pump and an air compressor, wherein the stirring and pumping integrated machine is used for stirring and pumping UHPC, the air compressor is used for providing spraying pressure of the UHPC, and the accelerator pump is used for simultaneously pumping the accelerator for spraying the UHPC.
7. The UHPC strengthening method for the underground cavern as recited in claim 1, wherein: the adjacent position refers to the position which is arranged on the ground adjacent to the underground chamber and enables the spray opening of the UHPC spraying equipment to enter the inside of the underground chamber through the connecting channel of the underground chamber; or disposed within the underground cavern.
8. The UHPC strengthening method for the underground cavern as recited in claim 1, wherein: and before spraying the UHPC reinforcing layer, spraying and wetting the surface of the reinforcing base layer.
9. The UHPC strengthening method for the underground cavern as recited in claim 1, wherein: and after the spraying of the UHPC reinforcing layer is finished, spraying, humidifying and maintaining the surface of the UHPC reinforcing layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111649426.6A CN114165071A (en) | 2021-12-31 | 2021-12-31 | UHPC (ultra high performance polycarbonate) reinforcement method for underground cavern |
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| CN202111649426.6A CN114165071A (en) | 2021-12-31 | 2021-12-31 | UHPC (ultra high performance polycarbonate) reinforcement method for underground cavern |
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|---|---|---|---|---|
| FR2875834A1 (en) * | 2004-09-24 | 2006-03-31 | Gtm Construction Soc Par Actio | Reinforced concrete shell reinforcing method, involves disposing jacks between arch and shell, and adjusting thickness of jacks to locally exert preset force between arch and shell so that arch takes part of load supported by shell |
| CN101691818A (en) * | 2009-10-12 | 2010-04-07 | 上海维固工程实业有限公司 | Building strengthening method |
| CN103321653A (en) * | 2013-06-27 | 2013-09-25 | 中国水电顾问集团成都勘测设计研究院 | Method of treating lining after collapse of underground cavern crown |
| CN104150845A (en) * | 2014-08-12 | 2014-11-19 | 杭州固华复合材料科技有限公司 | Ultrahigh-toughness cement-based composite material used in ejection, and ejection process thereof |
| CN110617084A (en) * | 2019-10-25 | 2019-12-27 | 中铁隧道局集团有限公司 | Method for reinforcing tunnel by spraying steel fiber concrete on tunnel net |
| CN110905555A (en) * | 2019-12-11 | 2020-03-24 | 湘潭大学 | UHPC lining structure for tunnel and construction method thereof |
| CN214883668U (en) * | 2021-06-04 | 2021-11-26 | 上海市人民防空工程有限公司 | Attached construction type underground cavity backfill treatment equipment |
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2021
- 2021-12-31 CN CN202111649426.6A patent/CN114165071A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2875834A1 (en) * | 2004-09-24 | 2006-03-31 | Gtm Construction Soc Par Actio | Reinforced concrete shell reinforcing method, involves disposing jacks between arch and shell, and adjusting thickness of jacks to locally exert preset force between arch and shell so that arch takes part of load supported by shell |
| CN101691818A (en) * | 2009-10-12 | 2010-04-07 | 上海维固工程实业有限公司 | Building strengthening method |
| CN103321653A (en) * | 2013-06-27 | 2013-09-25 | 中国水电顾问集团成都勘测设计研究院 | Method of treating lining after collapse of underground cavern crown |
| CN104150845A (en) * | 2014-08-12 | 2014-11-19 | 杭州固华复合材料科技有限公司 | Ultrahigh-toughness cement-based composite material used in ejection, and ejection process thereof |
| CN110617084A (en) * | 2019-10-25 | 2019-12-27 | 中铁隧道局集团有限公司 | Method for reinforcing tunnel by spraying steel fiber concrete on tunnel net |
| CN110905555A (en) * | 2019-12-11 | 2020-03-24 | 湘潭大学 | UHPC lining structure for tunnel and construction method thereof |
| CN214883668U (en) * | 2021-06-04 | 2021-11-26 | 上海市人民防空工程有限公司 | Attached construction type underground cavity backfill treatment equipment |
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