A kind of underground engineering water level observation well construction methodTechnical field
The present invention relates to underground engineering field, in particular to a kind of underground engineering water level observation well construction method.
Background technique
In order to develop and use Underground Space Resource, people built as lower room, underground railway, vcehicular tunnel, underwaterThe underground engineerings such as tunnel, underground common trench and street crossing underpass.In underground engineering construction, concrete structure often will do itIt pours, to separate the underground space and stratum.Certain Project is in rich groundwater region, especially at rainy season, if groundLower water level is excessively high, in fact it could happen that the situation of underground engineering anti-floating ability deficiency then needs to carry out counterweight to underground engineering in time, to increaseStrong underground engineering anti-floating ability.It since the engineering original designs not set water level observation well, is required, is needed according to this engineering Anti-floating designWater level observation well is added on minus two layers of original structure bottom plate top, to observe level of ground water situation.For this purpose, after completion of works howWater level observation well is added, is badly in need of construction personnel and accounts for and study.
Summary of the invention
Present invention aims at: for the underground engineering that need to monitor level of ground water situation, how to be added after completion of worksThe problem of water level observation well, provides a kind of underground engineering water level observation well construction method, by boring on engineering structure bottom plateSighting tube is simultaneously installed in hole, observes to realize level of ground water situation, and this method construction is simple is convenient, is particluarly suitable for workThe case where water level observation well is added after completion of works.
To achieve the goals above, the technical solution adopted by the present invention are as follows:
A kind of underground engineering water level observation well construction method, comprising the following steps:
A, line setting is carried out in inspection well construction location, plain concrete surface layer in the region is abolished according to positioning boundaryTo structure base slab, the first gate valve is installed on bottom plate after clearing up residue；
B, it after fully opening the first gate valve, drills through the first gate valve to bottom plate direction, stops after drilling through bottom plate water outletIt drills and removes drilling machine, drainage duct is connected on the first gate valve and is drained；
C, after water to be discharged is clear water, the first gate valve is closed, drainage duct is removed, variable diameter is installed on the first gate valveHead, and aqueduct is connected in path changing head；
D, the second gate valve is installed on aqueduct, and transparent sighting tube is installed on the second gate valve, in observation pipe surfaceElevation scale strip is pasted according to elevation；
E, after inspection well debugging, region is abolished to bottom plate using concrete and is backfilled.
This method is by installing the first gate valve after abolishing to bottom plate surface layer plain concrete, and through the first gate valve to bottom plateDirection drills to underground water and is connected to, and path changing head is then installed on the first gate valve, and aqueduct is connected in path changing head, andSecond gate valve is installed on aqueduct, and transparent sighting tube is installed on the second gate valve, to realize to level of ground water situationIt is observed, this method construction is simple is convenient, is particluarly suitable for the case where adding water level observation well after completion of works.
As a preferred solution of the present invention, when installing the first gate valve, according to the first gate valve ring flange hole location on bottom plateIt drills and is implanted into thread, after bar planting reaches design strength, the first gate valve is fixed on bottom plate using nut, thus willFirst gate valve is securely connect by ring flange with bottom plate.
As a preferred solution of the present invention, first gate valve is cast iron valve.
As a preferred solution of the present invention, the drainage duct includes ring flange compatible with the first gate valve, Yi JiyuThe drainpipe of ring flange welding, and the water outlet of drainpipe abolishes region far from bottom plate.Using the drainage duct of this structure, bothConvenient for being connected with the first gate valve, and water can be drained into bottom plate and abolished except region, after avoiding bottom plate from abolishing the influence of region pondingContinuous construction.
As a preferred solution of the present invention, the path changing head is in cone shape, and both ends are equipped with ring flange, and are located at variable diameterThe ring flange of head big end is adapted with the first gate valve.The path changing head completes pipeline smoothly transitting from major diameter to minor diameter,Avoid the first gate valve to the hydraulic pressure mutation between aqueduct.
As a preferred solution of the present invention, the aqueduct is stainless steel pipes, and both ends are equipped with steel flange disk, andThe ring flange is adapted with the ring flange of path changing head small end.By using stainless steel pipes as aqueduct, be able to bear compared withBig water pressure, and steel flange disk is set at both ends, it is convenient to be connect with the installation of path changing head, the second gate valve.
As a preferred solution of the present invention, second gate valve is stainless steel sluice valve.
As a preferred solution of the present invention, the sighting tube is attached lengthening using sleeve, and sighting tube lower end is equipped withRing flange facilitates and carries out spreading according to Ground-water level situation.
As a preferred solution of the present invention, the first gate valve, path changing head, aqueduct, the second gate valve and sighting tube companyJunction is respectively provided with water stop spacer, to avoid that leak occurs at each component faying face.
As a preferred solution of the present invention, when inspection well is debugged, water should be first filled in sighting tube and aqueduct, thenThe first gate valve is opened again, and record can be observed after stable level.In this way mainly in advance to sighting tube andAqueduct carries out filling of pouring water, and can occur level of ground water to avoid opening when the first gate valve and quickly changes and measurement error occur.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
This method is by installing the first gate valve after abolishing to bottom plate surface layer plain concrete, and through the first gate valve to bottom plateDirection drills to underground water and is connected to, and path changing head is then installed on the first gate valve, and aqueduct is connected in path changing head, andSecond gate valve is installed on aqueduct, and transparent sighting tube is installed on the second gate valve, to realize to level of ground water situationIt is observed, this method construction is simple is convenient, is particluarly suitable for the case where adding water level observation well after completion of works.
Detailed description of the invention
Fig. 1 is underground engineering water level observation well construction method flow chart of the present invention.
Fig. 2 is underground engineering water level observation well structural schematic diagram of the present invention.
Marked in the figure: 1- bottom plate, 11- bottom plate abolishes region, the first gate valve of 2-, 3- path changing head, 4- aqueduct, the second lock of 5-Valve, 6- sighting tube.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, rightThe present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, notFor limiting the present invention.
Embodiment
The present embodiment provides a kind of underground engineering water level observation well construction methods；
As Figure 1-Figure 2, the underground engineering water level observation well construction method in the present embodiment, comprising the following steps:
A, line setting determination is carried out in inspection well construction location and abolish region, according to positioning boundary using electric pick to the areaPlain concrete surface layer is abolished to structure base slab 1 in domain, and is cleaned out after residue and installed the first gate valve 2 on bottom plate；
B, it after fully opening the first gate valve, drills through the first gate valve to bottom plate direction, stops after drilling through bottom plate water outletIt drills and removes drilling machine, drainage duct is connected on the first gate valve and is drained；
C, after water to be discharged is clear water, the first gate valve is closed, drainage duct is removed, variable diameter is installed on the first gate valve 2First 3, and aqueduct 4 is connected in path changing head 3；
D, the second gate valve 5 is installed on aqueduct 4, and transparent sighting tube 6 is installed on the second gate valve 5, in sighting tubeSurface elevation scale strip is pasted according to elevation；
E, after inspection well debugging, region 11 is abolished to bottom plate using concrete and is backfilled.
This method is by installing the first gate valve after abolishing to bottom plate surface layer plain concrete, and through the first gate valve to bottom plateDirection drills to underground water and is connected to, and path changing head is then installed on the first gate valve, and aqueduct is connected in path changing head, andSecond gate valve is installed on aqueduct, and transparent sighting tube is installed on the second gate valve, to realize to level of ground water situationIt is observed, this method construction is simple is convenient, is particluarly suitable for the case where adding water level observation well after completion of works.
In the present embodiment, first gate valve 2 is DN150 cast iron valve, both ends band mounting flange, according to the first lockValve base ring flange hole location marks on bottom plate, drilling implantationHigh-strength thread, implantation depth 200mm, outsideReveal 100mm, clean out hole before bar planting, hole reinforcement planting glue is answered full when bar planting, forbids shaking after implantation, it is ensured that bar plantingQuality.After bar planting reaches design strength, the first gate valve bottom end ring flange is inserted in after being inserted in water stop spacer, and uses high-strength spiral shellMother is fixed, which is the double-deck high pressure rubber water stop spacer, can be to avoid leak at the first gate valve bottom end ring flange.
In the present embodiment, the drainage duct includes ring flange compatible with the first gate valve, and is welded with ring flangeDrainpipe, and the water outlet of drainpipe abolishes region far from bottom plate.Using the drainage duct of this structure, both it was convenient for and firstGate valve is connected, and water can be drained into bottom plate and abolished except region, and avoiding bottom plate from abolishing region ponding influences subsequent construction.Specifically, it usesRing flange (internal orifice dimension 150mm)Cast iron steel-pipe welding, the long 600mm~800mm of cast iron steel pipe are advisable(can be adjusted according to construction site foundation depth).When installing drainage duct, by drainage ductOn ring flange and the first gate valvePortion's ring flange usesPlain bolt is fixed, and centre adds rubber water-proof gasket, prevents ring flange leak.
In the present embodiment, after the completion of high-strength nut fastening, drilled using hidden hole drilling, aperture 100mm.First gate valve peaceAfter dress is fixed, the first gate valve is opened, drilling machine calibrate that (drill bit deviations are controlled goes through the within 2cm, before drilling in placeWhether one gate valve is fully open, prevents from destroying the first gate valve when drilling, checks whether drilling machine frame body consolidates), when drilling through under bottom platePortion impermeable stratum Mao Shuihou stops drilling, removes drilling machine, ready water band (or transparent hose) is covered on drainage duct,Water is led to gutter (or sump) nearby, then cleans out ponding (or silt) for flowing into foundation pit etc., it is to be dischargedWater is closes the first gate valve, the temporary partition to underground water can be realized after clear water, so that underground water is avoided to emerge always, shadowRing subsequent construction；Then drainage duct is removed, can start to carry out subsequent parts installation.
In the present embodiment, the path changing head 3 is in cone shape, and both ends are equipped with ring flange, and are located at path changing head big endRing flange is adapted with the ring flange on the first gate valve.The path changing head completes smooth mistake of the pipeline from major diameter to minor diameterIt crosses, avoids the first gate valve to the hydraulic pressure mutation between aqueduct.Specifically, path changing head using cast iron welding fabrication (Become), each welding flange in path changing head both ends, (top isRing flange, bottom areRing flange), weld seam is answered fullAnd meet related specification requirement.Preservative treatment is carried out after path changing head molding.When installing path changing head, by path changing head big end ring flangeIt is fastened with the first gate valve top flange dish using M20 high-strength bolt, centre adds rubber water-proof gasket, prevents ring flange leak.
In the present embodiment, the aqueduct 4 is stainless steel pipes, and both ends are equipped with steel flange disk, and the ring flangeIt is adapted with the ring flange of path changing head small end.By using stainless steel pipes as aqueduct, it is able to bear biggish hydraulic pressurePower, and steel flange disk is set at both ends, it is convenient to be connect with the installation of path changing head, the second gate valve.Specifically, aqueduct usesStainless-steel pipe, steel pipe both ends are respectively weldedSteel flange disk, weld seam answer full and meet related specification requirement.When aqueduct is installed, aqueduct end flange disk and path changing head small end ring flange are fastened using M16 high-strength bolt, centre addsRubber water-proof gasket prevents ring flange leak.
In the present embodiment, second gate valve 5 isStainless steel sluice valve.When installing the second gate valve, by the second gate valve bottomPortion's ring flange connect fastening using M16 high-strength bolt with aqueduct top flange dish, and centre adds rubber water-proof gasket, prevents methodBlue disk leak.
In the present embodiment, the sighting tube 6 is attached lengthening using sleeve, and sighting tube lower end is equipped with ring flange, sideJust spreading is carried out according to Ground-water level situation.Specifically, sighting tube usesTransparent KBG pipe, 3 meters of every root long useSleeve connection, sleeve cover internal thread, the outer silk of two end cap of KBG pipe, lower partRing flange mantle fiber.When installing sighting tube, first by secondGate valve upper flange disk and sighting tube lower partRing flange is fastened with M16 high-strength bolt, and centre adds rubber water-proof gasket, is preventedOnly ring flange leak.When assembling sighting tube, in sighting tube end, mantle fiber is wrapped with unsintered tape, pays attention to winding direction, is such as being screwed into setIt when in cylinder, rotates clockwise to the right, the direction that we twine unsintered tape on observation pipe end is exactly inverse time to the leftThe more stubborn needle winding, can be the tighter when twisting sighting tube in this way, will not loosen), it should be noted that dynamics and direction when twisting sighting tube, notHave to centainly be screwed to twist really it is motionless just do not leak, as long as twist when feel can be able to eat strength.Answer this engineering level of ground waterHigher, sighting tube pipe mounting height is advisable away from negative one layer top plate lower part 20cm.After sighting tube is installed, on its surface according to heightJourney glues elevation scale strip.
In the present embodiment, first gate valve, path changing head, aqueduct, the second gate valve and sighting tube be it is vertically-mounted,It should be guaranteed at vertical state as far as possible when installing, and be respectively provided with water stop spacer in each ring flange faying face, to avoid each portionLeak occurs at part faying face.
In the present embodiment, in inspection well debugging, water should be first filled in sighting tube and aqueduct, then opens first againGate valve can be observed record after stable level.Mainly sighting tube and aqueduct are carried out in advance in this wayIt pours water filling, can occur level of ground water to avoid opening when the first gate valve and quickly change and measurement error occur.
In the present embodiment, after items check no problem, region is abolished using concrete backfill bottom plate.It should be checked before backfillWhether each connecting portion has whether drainage, the first gate valve are opened.After inspection, casting concrete pours height with negativeTwo layers of ground elevation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in original of the inventionMade any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within reason.