CN1225974A

CN1225974A - Technology for quickly resuming normal construction after wellhole submerged by sudden water

Info

Publication number: CN1225974A
Application number: CN 98110054
Authority: CN
Inventors: 翟德元
Original assignee: SHANDONG MINING COLLEGE
Current assignee: SHANDONG MINING COLLEGE
Priority date: 1998-02-09
Filing date: 1998-02-09
Publication date: 1999-08-18
Anticipated expiration: 2018-02-09
Also published as: CN1059012C

Abstract

The method for making submerged wellbore with sudden water quickly restore normal construction is characterized by that firstly, adopting stone-filling grout injection method to construct water-stopping pad in the well bottom, then pumping out sudden water from well bottom, drilling and injecting grout into the surrounding rock, blocking crack, then breaking pad and driving to restore normal construction. Said invented is good in water-stopping effect, small in quantities, short in construction period, small in investment, and specially is applicable to salts deposit wellbore that produce sudden water when it is driving, and for submerged well with water depth of over 60m, it is a specific effective method for restoring normal construction.

Description

Recover the technical method of normal construction behind the wellhole submerged by sudden water rapidly

The invention belongs to the special construction method of pit shaft engineering in the mine construction.

At surface water enrichment basement rock is that the salt deposit shaft of vertical well of limestone is dug well in the construction, prominent watered-out well accident often takes place, analyzing reason mainly is that bedrock fracture is grown and surface water forms pure conduit pipe, in case prominent watered-out well takes place, is difficult to resume production, causes pitshaft to scrap.Dawenkou, Shandong gypsum mining area for example, existing three water bursting in mine are scrapped and are caused enormous economic loss.They preferably adopt surface grout injection method and all not successes of constructing concrete waterstop pad method under water in resuming production.In the shaft building of colliery, also have and adopt ground to give the prior shutoff of slip casting method crack in advance to prevent gushing water, its method is that slip casting is carried out, shutoff crack, tunneling construction then in the hole of drilling in the pit shaft country rock on ground.This method is resumed production as being used for prominent watered-out well, and the boring amount is big, and grouting amount is big, the construction costs height, and the construction period is long, reaches eight months time, and effect is also undesirable.Constructing concrete waterstop pad method under water, be by pipeline placing of concrete in the water of shaft bottom on ground, after treating concrete setting, draw water again to country rock perforating slip casting, this method is suitable for being flooded 60 meters shallow water pit shafts with the interior depth of water, and concrete easily produces segregation Qinshui phenomenon when the depth of water, and waterstop pad intensity is low, plugging effect is bad, still can not recover normal construction.

Purpose of the present invention, provide a kind of more than 60 meters behind the well depth wellhole submerged by sudden water stagnant water effect good, the boring amount is few, grouting amount is few, the construction period is short, the new method of the rapid recovery normal construction of small investment.

Technical scheme of the present invention is: 1. flooded the shaft bottom with the slip casting method of rockfilling at quilt and construct the coagulation waterstop pad, construction method is:

(1) at first makes a round platform formula metallic structures, metallic structures comprises the Grouting Pipe framework, the base diameter of this framework is to be advisable by pit shaft, fix a waterstop pad Grouting Pipe at frame center, fixing some breeches pipes of side direction welding around Grouting Pipe, prop up breeches pipe and be connected with Grouting Pipe, fixing some giving buried the slip casting sleeve pipe around framework;

(2) metallic structures is transferred to the shaft bottom of being flooded pit shaft, insert stone to the shaft bottom then, insert highly to calculate and decide on the pressure size of gushing water pressure head;

(3) to connect grouting method routinely injects cement grout, cement grout in the stone in shaft bottom water/binder ratio be 0.6-1 to the waterstop pad Grouting Pipe in ground configuration grouting pump and pit shaft: 1, and mix the early strength admixture of cement amount 3-5%, inject the cement grout after coagulation and form waterstop pad.

2. draw water and bore injected hole

After waterstop pad forms, extract the gushing water flooded in the pit shaft out, in design pit shaft country rock, bore the degree of depth that injected hole, hole depth surpass the fractured rock that leaks by the giving reason slip casting sleeve pipe on the metallic structures with water pump.

3. to the slip casting of pit shaft wall-rock crack

Grouting method is to injected hole cement injection or other grouting for water blocking materials routinely by the surface grout injection pump, and during as the injection cement paste, water/binder ratio should be grasped 1.5～0.75 according to the wall-rock crack size: between 1, until the crack all is full of.

4. broken pad driving

After the slurries of waiting to inject wall-rock crack solidify, also can adopt the broken pad driving of drilling and blasting method, recover normal construction.

The present invention has following good effect: can recover normal construction at short notice after the pit shaft gushing water is flooded, water plugging effect is good, and the boring amount is few, and grouting amount is little, the small investment instant effect.Flooded for the deep-well of well depth especially, also can be recovered normal construction rapidly above 60 meters.

Specific embodiment of the present invention is described according to Fig. 1, Fig. 2.

Fig. 1 is the metallic structures schematic diagram, 1-framework among the figure, and 2-waterstop pad Grouting Pipe, 3-props up breeches pipe, the pre-buried slip casting sleeve pipe of 4-;

Fig. 2 is a construction schematic diagram of the present invention, among the figure 2,3,4, the 5-borehole wall, and the 6-grouting pump, 7-concrete waterstop pad, the 8-inlet well, the 9-aquifer, 10-is flooded gushing water.

One, after pit shaft is flooded, at shaft bottom constructing concrete grout cover (7), at first makes metallic structures before constructing with the slip casting method of rockfilling.The structure of metallic structures such as Fig. 1 weld fixedly waterstop pad Grouting Pipe (2) at the center of round platform formula metal framework (1), and staggered the giving in side stayed some holes around Grouting Pipe (2), welds a breeches pipe (3) on every hole, on the breeches pipe (3) some apertures arranged; Evenly fixing some giving buried slip casting sleeve pipe (4) around framework (1), and how much quantity decides to be generally the 6-8 hole on the size of rock crack.

Metallic structures as shown in Figure 2, is transferred to shaft bottom with wire rope suspensioning with winch with metallic structures after making, and the border is consistent as far as possible and vertical as far as possible with the wellbore centre line with the spacing all around of the borehole wall (5).Insert stone to the shaft bottom then, the granularity of stone is advisable with 20-40mm, and filling thickness is decided according to the size and the grouting pressure of gushing water pressure head.As calculated generally in 5-10 rice; After stone is filled to design thickness, connect by grouting pump (6) and center Grouting Pipe (2) that ground is provided with, grouting method injects cement grout routinely, size levelling water/binder ratio according to the grouting pressure value, water/binder ratio is at 0.6-1.1: between 1, the early strength admixture of cement amount 3-5% to be mixed in the slurries, waterstop pad (7) can be solidified as after cement paste is filled with 7 days.

Two, extract the gushing water (10) that is flooded pit shaft out by the water pump on ground, rock drill is set in pit shaft then buries slip casting sleeve pipe (4) fissure rock brill injected hole (8) around pit shaft by son, drilling depth surpasses aquifer (9), and the foot of hole circle directly is greater than the 3-5 rice of pit shaft intended diameter.

Three, after boring is accomplished fluently, use conventional slip casting by surface grout injection pump (6), method is injected the water blockoff slurries and is generally selected cement grout for use in boring, water/binder ratio is aligned at any time according to grouting pressure, reduce water/binder ratio when pressure is big, generally levelling between 1.5: 1 and 0.75: 1, stifled real until crack around the pit shaft is filled with.

Four, also available drill eye blasting method broke waterstop pad after slurries to be injected solidified, and recovered normal pit shaft tunneling construction.

Claims

1. recover the technical method of normal construction behind the wellhole submerged by sudden water rapidly, it is characterized in that:

1.1 at first adopt the slip casting method of rockfilling being flooded shaft bottom constructing concrete waterstop pad, construction method is:

1.1.1 make metallic structures according to mineshaft diameter, it comprises the Grouting Pipe framework, frame center is fixed with the waterstop pad Grouting Pipe, welds some breeches pipes around the Grouting Pipe, is fixed with around the framework to give reason slip casting sleeve pipe;

1.1.2 metallic structures transferred to flooded the shaft bottom, insert stone to the shaft bottom then;

In the stone of shaft bottom, inject cement grout according to a conventional method 1.1.3 connect Grouting Pipe, solidify the back and form waterstop pad at the ground configuration grouting pump;

1.2 waterstop pad blocks after the shaft bottom leaks, and extracts the gushing water that is flooded in the pit shaft out with water pump, buries the slip casting sleeve pipe bore injected hole in the country rock of design pit shaft by giving;

1.3 grouting method injects the water blockoff slurries by injected hole to the pit shaft wall-rock crack routinely, is full of until the crack;

1.4 also can break the pad driving after slurries to be injected solidify, recover normal construction.