CN2276518Y

CN2276518Y - Open caisson no-hydraulic sealing bottom device

Info

Publication number: CN2276518Y
Application number: CN 96222437
Authority: CN
Inventors: 蔡惠良
Original assignee: CONSTRUCTION WORK DEPARTMENT BAOGANG METALLURGICAL CONSTRUCTION CORP SHANGHAI
Current assignee: CONSTRUCTION WORK DEPARTMENT BAOGANG METALLURGICAL CONSTRUCTION CORP SHANGHAI
Priority date: 1996-12-12
Filing date: 1996-12-12
Publication date: 1998-03-18
Anticipated expiration: 2006-12-12

Abstract

The utility model discloses an open caisson no-hydraulic sealing bottom device. The inner wall of a steel pipe collecting well is hermetically welded with a circular steel cover plate; an air inlet pipe and a water outlet pipe are welded on the circular steel cover plate in the direction of the depth of the steel pipe collecting well; the upper ends of the air inlet pipe and the water outlet pipe are respectively provided with an air inlet valve and a water outlet valve; the top of the water outlet pipe is communicated with a water pump. With the device, leakage on the bottom board and the side walls of the open caisson can be examined in advance, the bottom of the open caisson is sealed under the case of no water pressure, and the successful rate is up to 100 percent.

Description

Device at the bottom of the anhydrous press seal of open caisson

The utility model is main relevant with the soil excavation in the architecture construction, relates in particular to a kind of device that is used for the construction of open caisson back cover.

In the prior art standard, the open caisson construction method that adopts dry type to cut the earth is that cut the earth in the limit, the limit sinks, and after open caisson sinks to design elevation, just stops to cut the earth, and does back cover work.Promptly throw piece stone earlier, push down the silt particle of open caisson bottom, pour into plain concrete bed course again; Before the plain concrete of perfusion, bury the steel pipe collecting well underground in plain concrete bottom earlier, compile underground water, and extract out, to eliminate the high pressure that underground water causes under the base plate by suction pump; Do the steel bar concrete base plate then, when the steel bar concrete intensity of open caisson base plate reaches 70% when above of design strength, just available flange plate blocks collecting well, the catchment base plate steel bar concrete on well head top of last just pouring.The open caisson degree of depth has tens meters usually, even tens meters, underground water rises fast, pressure is big, requires on the above-mentioned bottom sealing method operation to be right after together together, finishes fast at short notice, carelessness or pause are arranged slightly, just drainage can occur, and back cover does not have absolute successful assurance.By hundreds of cube, even the open caisson that builds up of thousands of side's concrete, Chang Yin makes the concrete leakiness firm by ramming and causes and leak, and is having under the situation of groundwater pressure, deals with very difficultly must go the shutoff again of shutoff concrete by cutter when serious, and is both time-consuming, takes a lot of work again.

The purpose of this utility model is, overcomes deficiency of the prior art, provides a kind of check open caisson base plate and sidewall of giving earlier leakproof to be arranged and guarantee that open caisson is at the anhydrous pressure condition device of property back cover success next time.

For achieving the above object, adopted following technical scheme in utility model: device at the bottom of the anhydrous press seal of a kind of open caisson, comprise a steel pipe collecting well, seal welding one garden shape steel deck-plate on steel pipe collecting well inwall, shape steel deck-plate upper edge, garden steel pipe collecting well depth direction is provided with air inlet pipe and escape pipe, the upper end of air inlet pipe and outlet pipe is separately installed with admission valve and outlet valve, and the top of outlet pipe is connected with suction pump.

Compared with prior art, the utlity model has following good effect:

1, because this device is provided with outlet valve and admission valve, as long as start suction pump, garden shape steel deck-plate can weld under the environment of no hydraulic pressure, drying fully.

2, after the welding of garden shape steel deck-plate and steel pipe collecting well inwall, as long as close outlet valve and admission valve, just can seal underground water, the back cover concrete can be watered in the above space of the steel deck-plate of collecting well under the environment of no hydraulic pressure, drying, guarantees once success of back cover.

3, the well body inspection for leakage work before the open caisson back cover is simple, only need close outlet valve and admission valve, and stay for some time, and all seepage parts all can be completely exposed.

4, in case find seepage, to open outlet valve and admission valve at once and continue to draw water, open caisson just can carry out leak stopping under anhydrous pressure condition, and carry out the method that leak stopping handles under the hydraulic pressure state and compare having in the prior art, and construction technology is simple and reliable.

5, this apparatus structure is simple, and is with low cost, utilizes this device, saved the former flange plate of always continuing to use for many years, not only reduced cost, also avoided because of the bad or poorly sealed ground water seepage problem that causes of flange plate crudy simultaneously.

6, because the back cover one-time success rate can reach 100%, can not only guarantee the construction period also have tangible economic effect.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Accompanying drawing 1 is the structural representation of device at the bottom of the anhydrous press seal of open caisson.

As shown in Figure 1, device at the bottom of the anhydrous press seal of open caisson of the present utility model, comprise a steel pipe collecting well 1, seal welding one garden shape steel deck-plate 2 on steel pipe collecting well 1 inwall, garden shape steel lid, plate 2 upper edge steel pipe collecting well depth directions are provided with an air inlet pipe 3 and an outlet pipe 4, and the upper end of air inlet pipe 3 and outlet pipe 4 is installed an admission valve 5 and an outlet valve 6 respectively, and the top of outlet pipe 4 is connected with suction pump.Outlet valve 6 should be complementary with the caliber of outlet pipe 4 and air inlet pipe 3 with the size of admission valve 5, and caliber is neglected the water outlet situation greatly and decided, and adopts 1 inch～2 inches be advisable usually.During making, the caliber of outlet pipe 4 and length should be greater than the caliber and the length of air inlet pipe 3, if when the caliber of outlet pipe 4 is 1.5 inches, the caliber of air inlet pipe 3 is advisable with 1 inch; When the length of outlet pipe 4 was 80cm～150cm, the length of air inlet pipe 3 was advisable with 30cm～70cm.Outlet pipe 4 and air inlet pipe 3 can guarantee preferably that with the welding position of steel deck-plate 2 bottom of air inlet pipe 3 exceeds phreatic surface 50cm～150cm, the degree of depth that the bottom of outlet pipe 4 is immersed in the underground water is 60cm～160cm, to guarantee also that simultaneously the air inlet pipe 3 of steel deck-plate 2 tops and the length of outlet pipe 4 are 10cm～20cm, to make things convenient for the unlatching of valve.Outlet pipe 4 is determined can guarantee that valve opening is a prerequisite conveniently, is generally 15cm～30cm with air inlet pipe 3 center to center distance.The welding position of garden shape steel deck-plate and steel pipe collecting well and the well head 10cm～20cm apart that catchments.The installation early gate must be confirmed to close tightly through check, can weld with outlet pipe 4 and air inlet pipe 3 behind the leakproof; The diameter of garden shape steel deck-plate 2 should be than the internal diameter of steel pipe collecting well 1 little 3mm～5mm, weld bead height should be between 8mm～14mm, to guarantee weldquality, the thickness of steel deck-plate 2 is got between 10mm～20mm, so that it has certain intensity and rigidity.

After open caisson 12 sinks to design elevation, throw piece stone 7 earlier during construction, push down the silt particle of open caisson bottom.Install on piece clitter top that steel pipe catchments and 1, pour into a mould plain concrete bed course 8, air inlet pipe 3 will be installed, the garden shape steel deck-plate 2 of outlet pipe 4 and admission valve 5, outlet valve 6 is welded on the inwall of steel pipe collecting well 1, opens admission valve 5, outlet valve 6 and suction pump.The underground water that extraction compiles is done steel bar concrete base plate 9 then.Then, close outlet valve 6 and admission valve 5 earlier, check that there is leakproof steel deck-plate 2 commissures, if any seepage, Open valve draws water immediately, and repair welding steel deck-plate 2 is up to water-tight; Closed outlet valve 6 and admission valve again 5 four ten eight hours, check around the steel pipe collecting well 1, leakproof arranged on the open caisson base plate 9, open caisson 12 walls, in case discovery seepage, opening valve draws water, after confirming no any seepage part, the intensity for the treatment of steel bar concrete base plate 9 reaches 70% when above of design strength, do not shrink the top that waterproof concrete 10 is poured into the well head that catchments with having again, also several reinforcing bars of repair welding 11 herein simultaneously, to strengthen the globality of shutoff concrete 10 and open caisson steel bar concrete base plate 9, after the maintenance seven days, the work of whole open caisson back cover promptly comes to an end.

Certainly, during construction, also device once mounting at the bottom of giving the anhydrous press seal of the open caisson of making earlier can be put in place, promptly needn't weld at the scene.Simultaneously can also be according to what of the groundwater run off of prediction, device at the bottom of the anhydrous press seal of open caisson is made into the series of products of different size, to satisfy the demand of different engineerings.

Claims

1, device at the bottom of the anhydrous press seal of a kind of open caisson, comprise a steel pipe collecting well, it is characterized in that: seal welding one garden shape steel deck-plate (2) on steel pipe collecting well (1) inwall, garden shape steel deck-plate (2) upper edge steel pipe collecting well (1) depth direction is provided with air inlet pipe (3) and outlet pipe (4), the upper end of air inlet pipe (3) and outlet pipe (4) is separately installed with admission valve (5) and outlet valve (6), and the top of outlet pipe (4) is connected with suction pump.

According to device at the bottom of the anhydrous press seal of the described open caisson of claim 1, it is characterized in that 2, outlet valve (6) is complementary with the size of admission valve (5) and the caliber of outlet pipe (4) and air inlet pipe (3); The caliber of outlet pipe (4) and length are greater than the caliber and the length of air inlet pipe (3).