CN115419068A - Ship lock concrete repairing process - Google Patents
Ship lock concrete repairing process Download PDFInfo
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- CN115419068A CN115419068A CN202211205906.8A CN202211205906A CN115419068A CN 115419068 A CN115419068 A CN 115419068A CN 202211205906 A CN202211205906 A CN 202211205906A CN 115419068 A CN115419068 A CN 115419068A
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- 230000008439 repair process Effects 0.000 claims description 26
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02C—SHIP-LIFTING DEVICES OR MECHANISMS
- E02C1/00—Locks or dry-docks; Shaft locks, i.e. locks of which one front side is formed by a solid wall with an opening in the lower part through which the ships pass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/30—Flood prevention; Flood or storm water management, e.g. using flood barriers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
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- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a ship lock concrete repairing process, which comprises the following steps: performing chiseling operation on a concrete surface to be repaired, and cleaning a base surface after the operation is finished to ensure that the base surface is dry and clean; and measuring and lofting the base surface, implanting a self-locking anchor rod after punching is finished at a lofting position, and keeping the self-locking anchor rod fixed. According to the invention, the self-locking anchor rods are implanted on the base surface, the stainless steel plate pads on the self-locking anchor rods are connected with the steel wire meshes embedded in the steel fiber concrete, and then after the steel fiber concrete is poured, the integral compressive strength can be improved, and meanwhile, the newly arranged concrete layer can be stably connected with the old concrete layer, so that the technical problem that the new concrete layer and the old concrete layer are easy to separate is avoided, a better repairing effect is achieved, repeated repairing in a short time is avoided, and the structural safety of the ship lock and the normal use of the ship lock are ensured.
Description
Technical Field
The invention relates to the technical field of ship lock repair, in particular to a ship lock concrete repair process.
Background
The ship lock is a box-shaped hydraulic building for ensuring that a ship smoothly passes through a concentrated water level drop on a channel, and the water level is lifted by filling and draining water into the channel controlled by the ship lock at two ends so that the ship can overcome the concentrated water level drop on the channel. The space of the ship lock is mainly formed by the upper lock head, the lower lock head, the lock walls on two sides and the space enclosed by the bottom plate of the ship lock, and the lock chamber is usually made of masonry or reinforced concrete.
Common reinforced concrete structure's floodgate room, its bottom plate is because be located the surface of water below for a long time, and the concrete that is corroded easily and leads to the surface is loose to drop, produces the pit, and serious meeting leads to perishable parts such as reinforcing bar, built-in fitting to expose to influence the overall structure stability of bottom plate.
The concrete secondary that directly adopts usually of current solution is pour, and the concrete after this kind of mode is pour very easily with former concrete layering, segregation, can not realize the stable connection on new and old concrete layer, and actual repair effect is relatively poor, and need repair repeatedly in the short time, when influencing the ship lock safety, still can influence the ship lock normal use.
Disclosure of Invention
The invention aims to provide a ship lock concrete repairing process, which aims to solve the technical problems that in the existing secondary concrete pouring process, new and old concrete layers are unstable in connection and are easy to separate.
In order to achieve the purpose, the invention provides the following technical scheme:
according to one aspect of the present invention, there is provided a ship lock concrete repair process, comprising the steps of:
performing chiseling operation on a concrete surface to be repaired, and cleaning a base surface after the operation is finished to ensure that the base surface is dry and clean;
measuring and lofting on the base surface, implanting a self-locking anchor rod after punching is finished at a lofting position, and keeping the position of the self-locking anchor rod fixed;
pouring steel fiber concrete, and enabling the steel fiber concrete to completely cover the part of the self-locking anchor rod extending out of the base surface;
a steel wire mesh is laid in the steel fiber concrete pouring process, and the steel wire mesh is connected with the end part of the self-locking anchor rod extending out of the base surface;
and (5) performing concrete maintenance after pouring is finished, and finishing repairing.
Preferably, the concrete surface needs to be subjected to ship lock water retaining operation before the chiseling operation is carried out;
wherein, the upstream side of the ship lock utilizes an upper lock to firstly repair the gate for water retaining, and the downstream side fills clay cofferdams between the downstream cantilever retaining wall and the navigation wall for water retaining;
the maintenance gate carries out gate water stop detection before water is retained, and if the maintenance gate meets the design requirement, the maintenance gate is directly used for retaining water;
if seepage exists, the outlet of the upper-stream water filling gallery is used as a water collecting well, and accumulated water is drained in time.
Preferably, before the cofferdam is filled, the upstream gate is closed, so that the inside of the ship lock is kept in a still water state, and the cofferdam body is prevented from being washed by water flow;
filling the cofferdam from the cantilever retaining wall to a navigation wall at the downstream of the ship lock, and filling the cantilever retaining wall to be at least 50cm above the top of the retaining wall;
the cofferdam positioned at the underwater part is not rolled, and the geogrid is paved on the cofferdam when the water is discharged;
after water is discharged for 50cm, adopting layered paving and layered rolling, overlapping wheel tracks for 50cm, and keeping the clay water content, wherein the loose paving thickness is not more than 30 cm;
tamping a part which is difficult to roll between the cofferdam and the concrete wall;
after the cofferdam is built, the weir bottom protection feet are built on the upper and lower sides of the weir body.
Preferably, after the cofferdam is filled, pumping and draining water in the lock chamber are finished, and the condition of a part of a cofferdam body connected with the cofferdam and the structure is observed in real time;
checking whether the joints of the cantilever retaining wall and the downstream navigation wall with the lower brake head have leakage or not in real time;
if the structure gap leaks, draining water according to the leakage condition;
and if the joint of the cofferdam leaks, adding clay to the outer side of the cofferdam for pressure compensation and compaction drainage, and draining water according to the leakage condition.
Preferably, the cofferdam is dismantled after the ship lock is repaired;
the removing direction of the cofferdam is opposite to the filling direction, the cofferdam is removed from the downstream navigation wall to the cantilever retaining wall in a retrogressive manner, the removed materials are temporarily stacked in the cavity of the downstream cantilever retaining wall of the ship lock, and the soil piling height is controlled not to exceed 2m of the top of the retaining wall;
in the dismantling process, in order to avoid damaging concrete of a downstream apron bottom plate of a ship lock, clay with the apron bottom more than 50cm is used as a protective layer;
and a scraper for scraping clay is welded on bucket teeth of the bucket before the protective layer is excavated, and the protective layer is hung by the scraper.
Preferably, the concrete surface to be repaired is an area of which the compressive strength of the concrete on the bottom surface of the ship lock is lower than a design standard;
when the bottom plate is subjected to chiseling operation, chiseling surface concrete, wherein the depth is 5cm, and leveling according to the uniform elevation;
when the surface concrete is chiseled off, the prior steel bars, concrete and embedded parts are protected;
after chiseling is completed, the chiseling surface is cleaned and dried, and the base surface is ensured to be free of sundries.
Preferably, during the measurement and lofting, a GPS is adopted to match with a steel ruler;
wherein, when an unsuitable position is met, the position is properly adjusted;
after the punching is finished, grouting is firstly carried out, and then the self-locking anchor rod is implanted;
the self-locking anchor rod is characterized in that a stainless steel plate pad is arranged at the end part of the self-locking anchor rod above the base surface, and the self-locking anchor rod is connected with the steel wire mesh through the stainless steel plate pad.
Preferably, the self-locking anchor rod is subjected to shear bearing capacity detection before being implanted into the fixing hole:
on the premise that concrete conditions, rod body conditions, anchor rod parameters and a construction process are consistent, detecting at least 3 anchor rods;
wherein, the anchor rod limit anti-pulling experiment is carried out by adopting a continuous loading or graded loading system;
continuous loading: loading to anchor destruction at a uniform rate, with a total loading time of 2-3min;
step (3) of loading in a grading way: and (3) loading step by taking 10% of the predicted limit load as one step, and keeping the load of each step for 1-2min, and when the load reaches 90% of the predicted limit load, loading step by taking 5% of the predicted limit load as one step, and keeping the load of each step for 30s until the anchor is damaged.
Preferably, the steel fiber concrete is formed by vibration during pouring, the time required from discharging of the mixture to completion of pouring is not longer than 45min, and the steel fiber concrete is guaranteed to be dense during pouring and forming so as to avoid segregation and layering of the mixture.
According to another aspect of the present invention, there is provided a reamer bit for use in the ship lock concrete repair process, comprising:
the supporting sleeve is in a hollow cylindrical shape, two notches are symmetrically arranged on the arc outer wall of the supporting sleeve about a virtual axis, and a threaded connecting part is arranged at one end of the supporting sleeve;
the cutting knife is positioned in the notch, the upper end of the cutting knife is rotatably connected with the notch, a connecting arm is arranged on one side opposite to the cutting knife, and the cross section of the cutting knife is of a fan-shaped structure;
and one end of the adjusting rod penetrates through the threaded connecting part and is connected with the corresponding end of the connecting arm, and the other end of the adjusting rod is positioned outside the supporting sleeve.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the self-locking anchor rods are implanted on the base surface, the stainless steel plate pads on the self-locking anchor rods are connected with the steel wire meshes embedded in the steel fiber concrete, and then after the steel fiber concrete is poured, the integral compressive strength can be improved, and meanwhile, the newly arranged concrete layer can be stably connected with the old concrete layer, so that the technical problem that the new concrete layer and the old concrete layer are easy to separate is avoided, a better repairing effect is achieved, repeated repairing in a short time is avoided, and the structural safety of the ship lock and the normal use of the ship lock are ensured.
2. According to the invention, the cutting amount of the cutter can be adjusted by pushing and pulling the connecting arm through the adjusting rod, so that the hole expanding aperture is effectively controlled, the adjusting rod is not influenced by torsion through the threaded connecting part, and the safety and stability in the hole expanding process are ensured. In addition, the cutter can be accommodated into the support sleeve through the adjusting rod so that the support sleeve can enter the drilled hole to realize reaming, and the cutter can also be accommodated into the support sleeve when being taken out, so that the support sleeve can be taken out conveniently.
Drawings
FIG. 1 is a flow chart of a ship lock concrete repair process according to one embodiment of the present invention;
fig. 2 is a schematic view of the overall structure of a reamer head according to an embodiment of the present invention;
fig. 3 is one of the internal structural views of the reamer head according to one embodiment of the invention;
fig. 4 is a second view of the internal structure of the reamer head according to an embodiment of the invention;
fig. 5 is a third view of the internal structure of the reamer head according to an embodiment of the invention.
In the figure: 1. supporting sleeves; 2. a notch; 3. a threaded connection; 4. a cutter; 5. a connecting arm; 6. an adjusting rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to FIG. 1:
according to one aspect of the present invention, there is provided a ship lock concrete repair process, comprising the steps of:
step S10, performing chiseling operation on a concrete surface to be repaired, and cleaning a base surface after the operation is completed to ensure that the base surface is dry and clean;
step S20, performing measurement lofting on a base surface, implanting a self-locking anchor rod after completing punching at a lofting position, and keeping the position of the self-locking anchor rod fixed;
step S30, pouring steel fiber concrete, and enabling the steel fiber concrete to completely cover the part of the self-locking anchor rod extending out of the base surface;
wherein, a steel wire mesh is laid in the process of pouring the steel fiber concrete, and the steel wire mesh is connected with the end part of the self-locking anchor rod extending out of the base surface;
and S40, performing concrete maintenance after the pouring is finished, and finishing the repairing.
In this scheme, for solving current concrete secondary and pour the in-process, the easy technical problem who separates of new and old concrete layer, so implant the auto-lock stock on the base plane, utilize the auto-lock stock to be connected with the wire net of predetermineeing in the steel fibre concrete to keep the concrete layer and the old concrete layer of new setting to keep stable being connected, in order to avoid appearing the easy technical problem who separates of new and old concrete layer.
In this embodiment, the construction and matching mass ratio of the concrete involved in the ship lock concrete repair process is as follows: cement: sand: stone: water: additive: the mixing material =1, 2.23; wherein the blending amount of the fly ash is 15.75 percent, the blending amount of the expanded SY-T is 7.44 percent, and the fly ash is obtained by mixing the fly ash and water according to the blending amount mode; the additive is a polycarboxylic acid high-performance water reducing agent (retarder) with the mixing amount of 2.41 percent. In the actual construction process, according to the material usage (kg/m < 3 >), the cement usage is 351kg, the sand usage is 784kg, the water usage is 150kg, the admixture usage is 106kg (the fly ash is 72kg, and the expansion SY-T is 34 kg), and the admixture usage is 11kg. The materials used in the mixing proportion are absolutely dry materials, the water content of sand and stone is considered in site operation and is properly adjusted, and 62.4 kg/m < 3 > of steel fiber is added.
In order to realize the repair work of the ship lock bottom plate and the roughening operation of the concrete surface before repair, the water retaining operation of the ship lock needs to be implemented in advance, and the concrete operation is as follows:
the upstream side of the ship lock utilizes an upper lock to firstly repair the gate for water retaining, and the downstream side fills clay cofferdams between the downstream cantilever retaining walls and the navigation walls for water retaining;
the maintenance gate carries out gate water stop detection before water retaining, and if the water retaining meets the design requirement, the maintenance gate is directly used for retaining water;
if seepage exists, the outlet of the upper-stream water filling gallery is used as a water collecting well, and accumulated water is drained in time. When water seepage exists, accumulated water can be effectively drained out of the bottom plate due to the fact that the outlet of the upper-stream water filling gallery is 90cm lower than the bottom plate.
Before cofferdam filling, the upstream gate is closed, so that the inside of the ship lock is kept in a still water state, and the problem that clay is lost due to washing of water flow on a cofferdam body is solved; the cofferdam construction is carried out from the cantilever retaining wall to the navigation wall at the downstream of the ship lock, a backhoe excavator is adopted for carrying out reverse transportation and filling, the cantilever retaining wall is firstly filled to be at least 50cm above the top of the retaining wall, and the cantilever retaining wall is properly protected; the cofferdam positioned in the underwater part is not rolled, and the geogrid is fully paved with the cofferdam at least for 1 time when the water is discharged; after water is discharged for 50cm, an excavator is adopted for layering laying and layering rolling, wheel tracks are lapped for 50cm, the loose laying thickness is not more than 30cm, and water is properly sprayed for moisturizing or airing according to the dry and wet conditions of soil, so that the water content of clay is kept in a proper range; tamping a part which is difficult to roll between the cofferdam and the concrete wall, wherein tamping can be realized by adopting a frog-type tamping machine or adopting a bucket of a digging machine to properly and forcibly discharge, and the closed cofferdam and an upper lock first inspection gate form integral sealing in the ship lock;
after the cofferdam is built, the weir bottom protecting feet are built on the upper and lower sides of the weir body. Specifically, after the cofferdam is filled, sand-loading ton bags (the size of each ton bag is 1m, 1m) are stacked in two layers at the upper side and the lower side respectively, and the bottom of the cofferdam is protected to avoid the problem that the cofferdam collapses or soil material flows to a ship lock part and is difficult to clean due to the fact that the water flow carries clay. Preferably, ton bag sets up the bottom and is two, and the surface course is 1 and is used for the ballast weight, stacks along cofferdam weir foot axis respectively with ship lock low reaches cantilever barricade and empty box navigation wall laminating. And a wave-proof slope can be arranged on the top surface of the cofferdam close to the downstream.
After the cofferdam is filled, pumping and drainage in the sluice chamber are completed, the condition of a part of the weir body connected with the cofferdam and the structure is observed in real time, for example, whether leakage exists at the joint of the cantilever retaining wall and the downstream navigation wall with the lower sluice head or not is checked in real time, and the drainage is performed according to the leakage condition when the leakage occurs at the structural gap. Specifically, a plurality of clean water pumps are additionally arranged for pumping and draining water so as to control the water leakage condition and ensure that the bottom plate is not immersed. Whether seepage takes place for cofferdam linking department in real time, if the seepage takes place for cofferdam linking department, then in the cofferdam outside filling clay pressure supplementing row real, the seepage condition drainage is looked into simultaneously. Specifically, a 4-12.5kw submersible pump can be used for pumping water outwards during water drainage to control the water leakage situation and ensure that the bottom plate is not submerged.
After the ship lock is repaired, the cofferdam needs to be removed, the removing direction of the cofferdam is opposite to the filling direction, the cofferdam is removed from the downstream navigation wall to the cantilever retaining wall in a regressive mode, removing materials are temporarily stacked in a cavity of the cantilever retaining wall at the downstream of the ship lock, the soil stacking height is controlled not to exceed the top of the retaining wall by 2m, and an excavator is specifically adopted to cooperate with a dump truck to dig and transport outwards at proper time. In the dismantling process, in order to avoid damaging concrete of a downstream apron bottom plate of a ship lock, clay with the apron bottom more than 50cm is used as a protective layer; and (3) welding a scraper for scraping clay on bucket teeth of the bucket before the protective layer is excavated, and hanging the protective layer by using the scraper. Specifically, when the excavator excavates, a steel plate is welded on bucket teeth of the excavator bucket to serve as a scraper, the scraper is slowly dug to the apron bottom plate, the protective layers are slowly collected together by the scraper and are dug together, and the steps are repeated until the cofferdam is completely removed.
This scheme can be restoreed lock bottom plate, side wall position to the lock bottom plate is for example:
the concrete surface of the bottom plate needs to be detected before restoration, wherein the area with the concrete compressive strength lower than the designed strength C30 (30-35 MPa) is used as the concrete surface to be restored.
When the bottom plate is roughened, surface concrete is chiseled to a depth of 5cm, standard rough surfaces are formed according to concrete engineering construction specifications, then C40 steel fiber concrete is poured to perform reinforcement operation, the pouring thickness is 8cm, and then leveling is performed according to unified standard elevations. When the surface concrete is chiseled off, the prior steel bars, concrete and embedded parts are protected. Specifically, dig the napping all-in-one through the hand propelled and mill plane, strengthen the protection to current reinforcing bar, concrete and prefab, this protection is realized through keeping the base face clean, dry. After chiseling is finished, cleaning and blow-drying the chiseling surface to ensure that the base surface has no impurities. Specifically, the qualified base surface which is chiseled off is firstly washed by high-pressure water to remove loose particles and dust, then the surface of the base surface is dried and cleaned by a high-power blower, the base surface is ensured to be free from loose particles, dust and oil stains, and then the base surface is dried by compressed air so that the connection tightness cannot be influenced by the subsequent concrete pouring.
Before the anchor rods are fixed, lofting needs to be conducted on hole positions, in the embodiment, a GPS is adopted to match with a steel ruler to conduct lofting positioning, for example, the distance between every two adjacent anchor rods is 80 × 80cm, and the steel ruler and the GPS are used for measuring the distance of 80cm in lofting. When the position is not suitable, the position is properly adjusted, and avoidance is needed if a reinforcing steel bar bearing structure is arranged in a step and concrete. After the punching is finished, grouting is firstly carried out, and then a self-locking anchor rod is implanted; wherein, the tip department that the auto-lock stock is located the basal plane top is equipped with the stainless steel plate pad, and the auto-lock stock passes through the stainless steel plate pad to be connected with the wire net. Specifically, a straight hole is drilled on the basis of lofting, and after bottom reaming is performed, the hole is measured after being cleaned, grouting is performed after design requirements are met, an anchor rod is implanted, and maintenance is completed. The anchor rods are partly located in the holes and partly above the base surface and the top ends are located at a height above the base surface, preferably 25mm above the base surface, i.e. half the depth of the base surface from the floor. The stainless steel plate pad and the steel wire mesh are positioned in the middle of a concrete layer poured on the base surface.
And the steel wire mesh is laid after the anchor rod is implanted so as to enhance the crack resistance of the steel fiber concrete, and the steel wire mesh is provided with a control protective layer by adopting a cushion block with the thickness of 20mm or even broken stones.
In practical application, the manufacturability of the self-locking anchor rod needs to be tested to ensure that the design requirement can be met, the main anti-shearing bearing capacity is detected, and the specific detection method comprises the following steps: .
Detecting at least 3 anchor rods on the premise of consistency of concrete conditions, rod body conditions, anchor rod parameters and construction process;
the concrete condition, the rod body condition, the anchor rod parameter and the construction process are the same as those of the actual engineering design, and the same condition position outside the anchoring area is selected by the detection environment;
the anchor rod limit anti-pulling experiment is carried out by adopting a continuous loading or graded loading system;
continuous loading: loading to anchor destruction at a uniform rate, with the total loading time being 2-3min;
step-by-step loading: and taking 10% of the predicted limit load as one stage, gradually loading, and holding each stage for 1-2min, and when the load reaches 90% of the predicted limit load, taking 5% of the predicted limit load as one stage, gradually loading, and holding each stage for 30s, until the anchor is damaged.
Wherein, when the anchor rod destructive test satisfies the following formula requirements, the anchoring quality can satisfy the requirements:
N C Rm ≥1.45f y As
N C Rmin ≥1.25f y As
wherein N is C Rm The average value of the ultimate tensile strength of the detected anchor rod is; n is a radical of hydrogen C Rmin The minimum value of the ultimate tensile strength of the detected anchor rod; f. of y Designed values for tensile strength of the anchor rod (N/mm); as is the stock body effective cross-sectional area (mm).
After the stock is fixed, can adopt destructive test to carry out quality testing and acceptance inspection to it, the extraction quantity is one thousandth of stock total number, and with specification, same model, a same position inspection batch, is no less than 1 group, and every group is no less than 3, realizes contrasting each other. The anchor rod drawing test loading equipment can be provided with a counter-force beam, and the distance between two fulcrums is not less than 3H (H is anchor rod anchoring depth).
The evaluation criteria of the detection are as follows:
when the tested anchor rod meets the macroscopic crack phenomena of no crack of the base material, no slippage of the anchor rod and the like, the load is more than 0.9f yk As（f yk As is the standard value of the tensile strength of the anchor rod), the load reduction is not more than 5 percent during holding load for 2min, and the deformation is not more than 10mm, and the anchor rod can be judged to be qualified. When unqualified anchor rods appear, the number of the random inspection of the anchor rods is increased, and the increased random inspection amount is 3 times of that of the unqualified anchor rods.
When all the samples extracted from one inspection batch are qualified, the samples are evaluated as qualified;
when the unqualified samples in one inspection batch do not exceed 5 percent, extracting 3 samples for destructive test, and if all the inspection results are qualified, judging that the samples are qualified;
when more than 5% of the samples failed in one test batch, the samples were judged to be failed and were not retested.
The steel fiber concrete is formed by vibration during pouring, the time required from discharging to pouring is not more than 45min, and the steel fiber concrete is ensured to be dense during pouring and forming so as to avoid segregation and delamination of mixtures. Specifically, the steel fiber concrete should be formed by mechanical vibration.
Specifically, the steel fiber concrete adopts a forced mixer, the cement adopts the ordinary Portland cement with high-brightness and high-strength PO42.5 according to the strength ratio of C40, and various materials can be put into use after being inspected to be qualified.
The mass ratio of the steel fiber concrete to the glue is not more than 0.45, the volume ratio of the steel fiber is 0.5-1%, the production is carried out according to the standard, when the fiber mixing amount is increased, the primary mixing amount is properly reduced and is not more than 80% of the rated mixing amount, and the fiber can be uniformly dispersed in the concrete by feeding through a shaking screen or a dispersion machine.
The steel fiber concrete is molded by vibration during pouring, the time required from discharging to pouring is not more than 45min, and the steel fiber concrete is ensured to be dense during pouring and molding so as to avoid segregation and delamination of mixtures. And measuring and lofting before pouring, repairing the bottom plate of the ship lock, uniformly leveling the elevation, controlling the pouring height by using an elevation positioning line, and strictly forbidding adding water to the concrete in the pouring process. Covering and maintaining the steel fiber concrete in time after pouring and forming, and avoiding water accumulation and sunshine insolation on the storage surface before primary solidification; and after the initial solidification, the curing can be carried out in a watering or flowing mode, and the curing time is not less than 28 days.
After the concrete pouring is finished, the concrete is accepted according to the regulation of No. 7.4.1 of GB50204-2002 acceptance Standard for concrete Structure engineering.
Similarly, the compression strength of the retarded soil test block can be tested before concrete pouring:
the standard cubic test piece with the side length of 150mm is manufactured by using the materials with the same label and the manufacturing process, 3 groups of test pieces with the curing age of 7 days and the curing age of 28 days are respectively manufactured for different structural members, the test pieces are placed at proper positions close to corresponding structural members, the same curing method is adopted, and the concrete ultimate compressive strength is measured by adopting a standard test method after the curing for 7 days and the curing for 28 days.
In this scheme, through implant the auto-lock stock on the base face, utilize the stainless steel sheet pad on the auto-lock stock and bury the wire net connection in steel fibre concrete underground, later steel fibre concrete placement back, can not only improve holistic compressive strength, the concrete layer that can also keep newly setting simultaneously is connected with old concrete layer is stable, in order to avoid appearing the technical problem of the easy separation of new and old concrete layer, thereby reach better repair effect, need repair repeatedly in having avoided the short time, the structure safety and the ship lock normal use of ship lock have been guaranteed.
Referring to fig. 2-5, there is shown a reamer bit according to another aspect of the present invention for use in a ship lock concrete repair process, comprising: the cutting device comprises a supporting sleeve 1, a notch 2, a threaded connecting part 3, a cutter 4, a connecting arm 5 and an adjusting rod 6. The support sleeve 1 is hollow and cylindrical, two notches 2 are symmetrically arranged on the arc outer wall of the support sleeve about a virtual axis, and a threaded connecting part 3 is arranged at one end of the support sleeve; the cutter 4 is positioned in the notch 2, the upper end of the cutter 4 is rotatably connected with the notch 2, the connecting arm 5 is arranged on one side, opposite to the cutter 4, of the cutter 4, and the cross section of the cutter 4 is of a fan-shaped structure; one end of the adjusting rod 6 penetrates through the threaded connection part 3 and is connected with the corresponding end of the connecting arm 5, and the other end of the adjusting rod is positioned outside the supporting sleeve 1. Specifically, the bottom of the supporting sleeve 1 can be provided with a conical structure, so that the supporting sleeve 1 can be stably fed into a hole, the cutter 4 is used for further enlarging the hole, so that a fixed anchor rod can be installed, the adjusting rod 6 is used for adjusting the position of the cutter 4 extending out of the notch 2, so that the cutter 4 can be cut more, the inner space of the hole is enlarged, the threaded connection part 3 is used for connecting the supporting sleeve 1 with a driving part, the driving part drives the threaded connection part 3 to rotate, and the adjusting rod 6 adjusts the position of the cutter 4 through the connecting arm 5, so that the hole enlarging aperture can be adjusted.
In the embodiment, the adjusting rod 6 pushes and pulls the connecting arm 5, so that the cutting amount of the cutter 4 can be adjusted, the hole expanding aperture can be effectively controlled, the adjusting rod 6 is not influenced by torsion due to the threaded connection part 3, and safety and stability in the hole expanding process are guaranteed. In addition, the cutter 4 can be retracted into the support sleeve 1 through the adjusting rod 6 so that the support sleeve 1 can enter a drilled hole to realize reaming, and when the cutter 4 is taken out, the cutter 4 can be retracted into the support sleeve 1 so that the support sleeve 1 can be taken out conveniently.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-volatile memory.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof.
Claims (10)
1. The ship lock concrete repairing process is characterized by comprising the following steps:
performing chiseling operation on a concrete surface to be repaired, and cleaning a base surface after the operation is finished to ensure that the base surface is dry and clean;
measuring and lofting the base surface, implanting a self-locking anchor rod after punching is finished at a lofting position, and keeping the self-locking anchor rod fixed;
pouring steel fiber concrete, and enabling the steel fiber concrete to completely cover the part of the self-locking anchor rod extending out of the base surface;
a steel wire mesh is laid in the steel fiber concrete pouring process, and the steel wire mesh is connected with the end part, extending out of the base surface, of the self-locking anchor rod;
and (5) performing concrete maintenance after pouring is finished, and finishing repairing.
2. The ship lock concrete repair process of claim 1, wherein:
the water retaining operation of the ship lock is required to be implemented before the chiseling operation is carried out on the concrete surface;
the upstream side of the ship lock utilizes an upper lock head to repair the gate to block water, and the downstream side fills clay cofferdam between a downstream cantilever retaining wall and a navigation wall to block water;
the maintenance gate carries out gate water stop detection before water is retained, and if the maintenance gate meets the design requirement, the maintenance gate is directly used for retaining water;
if seepage exists, the outlet of the upper-stream water filling gallery is used as a water collecting well, and accumulated water is drained in time.
3. The ship lock concrete repair process of claim 2, wherein:
before the cofferdam is filled, the upstream gate is closed, so that the interior of the ship lock is kept in a still water state, and the cofferdam body is prevented from being washed by water flow;
the cofferdam is filled from the cantilever retaining wall to a navigation wall at the downstream of the ship lock, and the cantilever retaining wall is filled to be at least 50cm above the top of the retaining wall;
the cofferdam positioned at the underwater part is not rolled, and a geogrid is paved on the cofferdam when the cofferdam goes out of the water;
after water is discharged for 50cm, adopting layered paving and layered rolling, overlapping wheel tracks for 50cm, and keeping the clay water content, wherein the loose paving thickness is not more than 30 cm;
tamping a part which is difficult to roll between the cofferdam and the concrete wall;
after the cofferdam is built, the weir bottom protection feet are built on the upper and lower sides of the weir body.
4. The ship lock concrete repair process of claim 3, wherein:
after the cofferdam is filled, pumping and draining water in the lock chamber are finished, and the condition of a part of a cofferdam body connected with the structure of the cofferdam is observed in real time;
checking whether the joints of the cantilever retaining wall and the downstream navigation wall with the lower brake head have leakage or not in real time;
if the structure gap leaks, draining water according to the leakage condition;
and if the joint of the cofferdam leaks, adding clay to the outer side of the cofferdam for pressure compensation and compaction drainage, and draining water according to the leakage condition.
5. The ship lock concrete repair process according to any one of claims 2 to 4, wherein:
the cofferdam is dismantled after the ship lock is repaired;
the removing direction of the cofferdam is opposite to the filling direction, the cofferdam is removed from the downstream navigation wall to the cantilever retaining wall in a retrogressive manner, the removed materials are temporarily stacked in the cavity of the downstream cantilever retaining wall of the ship lock, and the soil piling height is controlled not to exceed 2m of the top of the retaining wall;
in the dismantling process, in order to avoid damaging concrete of a downstream apron bottom plate of a ship lock, clay with the bottom of the apron being more than 50cm is used as a protective layer;
and a scraper for scraping clay is welded on bucket teeth of the bucket before the protective layer is excavated, and the protective layer is hung by the scraper.
6. The ship lock concrete repair process of claim 1, wherein:
the concrete surface to be repaired is an area with the compressive strength of the concrete on the bottom surface of the ship lock lower than the design standard;
when the bottom plate is chiseled, removing surface concrete with the depth of 5cm, and leveling according to the uniform elevation;
when the surface concrete is chiseled off, the prior steel bars, concrete and embedded parts are protected;
after chiseling is finished, cleaning and blow-drying the chiseling surface to ensure that the base surface has no impurities.
7. The ship lock concrete repair process of claim 1, wherein:
during measurement and lofting, a GPS is adopted to match with a steel ruler;
wherein, when an unsuitable position is met, the position is properly adjusted;
after the punching is finished, grouting is firstly carried out, and then the self-locking anchor rod is implanted;
the self-locking anchor rod is arranged on the end portion, located above the base surface, of the self-locking anchor rod, and the self-locking anchor rod is connected with the steel wire mesh through the stainless steel plate pad.
8. The ship lock concrete repair process of claim 7, wherein:
the self-locking anchor rod carries out shearing resistance bearing capacity detection before being implanted into the fixing hole:
detecting at least 3 anchor rods on the premise of consistency of concrete conditions, rod body conditions, anchor rod parameters and construction process;
wherein, the anchor rod limit anti-pulling experiment is carried out by adopting a continuous loading or graded loading system;
continuous loading: loading to anchor destruction at a uniform rate, with a total loading time of 2-3min;
step (3) of loading in a grading way: and (3) loading step by taking 10% of the predicted limit load as one step, and keeping the load of each step for 1-2min, and when the load reaches 90% of the predicted limit load, loading step by taking 5% of the predicted limit load as one step, and keeping the load of each step for 30s until the anchor is damaged.
9. The ship lock concrete repair process of claim 1, wherein:
the steel fiber concrete is formed by vibration during pouring, the time required from discharging to pouring is not longer than 45min, and the steel fiber concrete is guaranteed to be dense during pouring and forming so as to avoid segregation and layering of the mixture.
10. A reamer bit for use in the ship lock concrete repair process of any one of claims 1, 7 and 8, comprising:
the supporting sleeve (1) is hollow and cylindrical, two notches (2) are symmetrically arranged on the arc outer wall of the supporting sleeve (1) relative to a virtual axis, and a threaded connecting part (3) is arranged at one end of the supporting sleeve;
the cutting knife (4) is positioned in the notch (2), the upper end of the cutting knife is rotatably connected with the notch (2), a connecting arm (5) is arranged on one side opposite to the cutting knife (4), and the cross section of the cutting knife (4) is of a fan-shaped structure;
and one end of the adjusting rod (6) penetrates through the threaded connecting part (3) and is connected with the corresponding end of the connecting arm (5), and the other end of the adjusting rod is positioned on the outer side of the supporting sleeve (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211205906.8A CN115419068A (en) | 2022-09-30 | 2022-09-30 | Ship lock concrete repairing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211205906.8A CN115419068A (en) | 2022-09-30 | 2022-09-30 | Ship lock concrete repairing process |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509353A (en) * | 2009-03-17 | 2009-08-19 | 武汉武大巨成加固实业有限公司 | Piston type multilayer expanding bit |
| CN114837563A (en) * | 2022-05-12 | 2022-08-02 | 泰山学院 | Reaming drill rod with spalling and rock breaking functions |
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2022
- 2022-09-30 CN CN202211205906.8A patent/CN115419068A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509353A (en) * | 2009-03-17 | 2009-08-19 | 武汉武大巨成加固实业有限公司 | Piston type multilayer expanding bit |
| CN114837563A (en) * | 2022-05-12 | 2022-08-02 | 泰山学院 | Reaming drill rod with spalling and rock breaking functions |
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| Title |
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| 曹胜中;彭燕莉;: "国电万安水电厂底孔闸墩裂缝处理及加固", 科技咨询导报 * |
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