A kind of blocking method of outer wall of underground structure
Technical field
The present invention relates to the realm of building construction, the leak stopping of all slits such as particularly a kind of underground structure constuction joint, telescopic hole, settlement joint, temperature shrinkage crack is handled.
Background technology
At present, after the outer wall of underground structure construction was accomplished, concrete generally can shrink to some extent, thereby caused exterior wall and waterproofing course to break away from, and formed the space; In addition, when the exterior wall surface out-of-flatness, when leaving certain gap between waterproofing course and the exterior wall, in the work progress, waterproofing course has destruction, and underground water can be along waterproofing course seepage flow.The space has water to fill between exterior wall and waterproofing course and the space enclosing structure, and when exterior wall surface had through crack, seepage can appear in exterior wall; Influence the presentation quality of building, the intensity and the durability of structure; Influence is normal to be used, and generally all will handle the crack, and the crack of seepage is particularly arranged.At present the crack method for repairing and mending that produces generally is divided into two kinds: 1, the epoxy mortar method is smeared on the surface, and this method plugging effect is poor but also occur seepage once more easily, and 2, chemical grouting fills Sealing Method; Though this method plugging effect is good; But cost is higher, and when grouting, need after the raggle of crack, carry out grouting for water plugging again; Concrete appearance damages big, thereby is difficult to conform to quality requirements.
Summary of the invention
In order to overcome the deficiency of prior art, the present invention provides a kind of easy construction, cost is low, plugging effect is good outer wall of underground structure blocking method.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of blocking method of outer wall of underground structure, its method step is following:
(1): to the boring of underground structure outer: near the constuction joint of structure outer or the bigger place of leakage point hole;
(2): bury Grouting Pipe underground: bury Grouting Pipe underground in the hole of step 1);
(3): slip casting: adopt neat slurry) from step 2 in Grouting Pipe, carry out slip casting successively, grouting pressure is controlled at 0.5~1.0Mpa, when pouring into or adjacent Grouting Pipe when flowing out mud, stops slip casting;
(4): the cutting Grouting Pipe, repair in the aperture: behind the structure outer leakproof, with the Grouting Pipe excision, with the floating aperture of cement mortar, accomplish consistent with the side wall appearance color, the assurance presentation quality.
The invention has the beneficial effects as follows: this method adopts the opposite path of seepage action of ground water, with cement paste infilled wall back of the body space, reaches the purpose of sealing.Through drilling the agent structure exterior wall, bury Grouting Pipe underground, fill the infiltration crack with cement paste, intercept water stream channel, play the outer initiatively effect of leak stopping of underground structure side wall.This method compliance is wider, can carry out seepage treatment to the crack that different reasons cause; And construction is simple, and the scope of single treatment is big, and cost is lower than chemical grouting leak stopping; And need not be along the crack raggle grouting for water plugging, concrete appearance damages few; Simultaneously, plugging effect is good, be difficult for repeatedly, thereby the leak stopping that can be widely used in all slits such as underground structure constuction joint, telescopic hole, settlement joint, temperature shrinkage crack is handled.
The specific embodiment
A kind of blocking method of outer wall of underground structure, its method step is following:
(1): underground structure outer is holed: hole in constuction joint or the bigger place of leakage point at structure outer;
Described aperture is: 50~70mm, pitch of holes is: 15~30m.The size of pore size, pitch of holes can adjust as the case may be, when described structure outer medial surface has waterproofing course, does not drill waterproofing course; The distance of said boring and base plate (floor) is 0.5~1.5m, thereby is convenient to drilling operation, when the distance of boring and base plate exceeds 0.5~1.5m, must set up operating platform.
(2): bury Grouting Pipe underground: bury Grouting Pipe underground in the hole of step 1);
Diameter 20~the 30mm of said Grouting Pipe, Grouting Pipe is given prominence to the about 300~500mm of exterior wall; Said Grouting Pipe adopts the leak stopping spirit to be blocked in the space between sealed tube and boring, and it is fixing to guarantee that Grouting Pipe connects; In addition, carry out slip casting for ease, can add valve on the said Grouting Pipe.
(3): slip casting: adopt neat slurry) from step 2 in Grouting Pipe, carry out slip casting successively, grouting pressure is controlled at 0.5~1.0Mpa, when pouring into or adjacent Grouting Pipe when flowing out mud, stops slip casting;
The water of said neat slurry and the weight ratio of cement are: 0.3~1.0, preferably 0.4~0.6; In the time will controlling range of grouting or slip casting total amount, can in neat slurry, mix water glass; After slip casting finishes, when finding that also structure outer has seepage, can carry out repeating step 1) carry out the secondary after-teeming to the operation of step 3).Can be during slip casting according to plugging effect, the basement number of plies is carried out staged and layered slip casting.
(4): the cutting Grouting Pipe, repair in the aperture: behind the structure outer leakproof, with the Grouting Pipe excision, with the floating aperture of cement mortar, cement mortar is joined through examination, accomplish consistent with the side wall appearance color, the assurance presentation quality.
This method adopts the opposite path of seepage action of ground water, with cement paste infilled wall back of the body space, reaches the purpose of sealing.Through drilling the agent structure exterior wall, bury Grouting Pipe underground, fill the infiltration crack with cement paste, intercept water stream channel, play the outer initiatively effect of leak stopping of underground structure side wall.This method compliance is wider, can carry out seepage treatment to the crack that different reasons cause; And construction is simple, and the scope of single treatment is big, and cost is lower than chemical grouting leak stopping; And need not be along the crack raggle grouting for water plugging, concrete appearance damages few; Simultaneously, plugging effect is good, be difficult for repeatedly, thereby the leak stopping that can be widely used in all slits such as underground structure constuction joint, telescopic hole, settlement joint, temperature shrinkage crack is handled.