Hypogee pit body waterproof construction precipitation processing method under a kind of water resource enriched environment
It is anti-that the present invention relates to hypogee pit bodies under hypogee waterproof technique more particularly to a kind of water resource enriched environment
Water Dewatering processing method.
Base pit dewatering is always the emphasis of building underground engineering construction, and Method on Dewatering of Foundation Pit is more, including bright ditch adds and catchments
Well precipitation, Application of light well point precipitation etc., but the above dewatering mode are not enough to exclude sump, elevator, cushion cap foundation well completely
The inside ponding constructed below equal bed courses absolute altitude, and due to the uncontrollability of field condition, substrate surface water is easily accumulated in lower.
When substrate shallow-layer abundant water, before waterproof layer laying, temporary drainage is carried out to sump, elevator, cushion cap foundation well etc.
It is laid with waterproof layer immediately afterwards, technology room is every service speed still not as good as substrate shallow seated groundwater to sump, elevator, cushion cap foundation well
Deng recharge speed.Above situation, it is possible to create tripartite's face is rung:
Firstly, influenced by ponding, waterproof construction base condition be unable to satisfy ensure construction of waterproof layer quality without bright water base
Layer require, may (or even bright water) excessive because of substrate humidity cause waterproof coating layer that can not form a film, waterproof roll overlap joint it is not firm
Secondly as the influence of ground water pressure, even if waterproof layer can hand over circle closed, waterproof layer holds without protection
Easily destroyed by ground water pressure.
Again, ponding make sump, elevator, cushion cap foundation well the structural concrete of bottom plate occur when pouring from
Analysis, compactness is poor, design requirement etc. is not achieved in thickness of protection tier, threatens so as to cause steel bar corrosion, concrete carbonization etc.
Summary of the invention
The technical problem to be solved by the present invention is to invent hypogee sump, elevator under a kind of water resource enriched environment
The pit bodies such as well, cushion cap foundation well waterproof construction dewatering measure tectonic sieving and construction treating methods can effectively overcome current foundation pit
Defect in precipitation technology, it is ensured that the requirement without bright water of construction of waterproof layer quality.
To achieve the goals above, the present invention adopts the following technical scheme:
Hypogee pit body waterproof construction precipitation processing method under a kind of water resource enriched environment, comprising the following steps:
Step a. is cheated in pit body bottom setting precipitation, and suction pump is arranged in hole in precipitation；
Step b. precipitation hole top sets cover board, the prefabricated casing of cover plate central or reserving hole, suction pump cable and drainpipe
It is pierced by out of casing or hole；Pit body bottom waterproof layer is laid with to casing or the closing in of hole periphery；
Before step c. pours hypogee pit body, the drainpipe and cable of suction pump are cut off；
Step d. is filled into precipitation hole from cover plate central casing or hole and is filled out graded sand and stone；
Into precipitation hole, casting concrete is to pit body bottom plane from cover plate central casing or hole by step e., then with speed
Condensate mud seal cover board center sleeve or hole maintain an equal level with cover board upper surface
Step f. is laid with the waterproof layer of cover plate central casing or hole position and overlaps with pit body bottom waterproof layer；
Step g. pours pit body structural concrete.
Preferably, the protective layer uses pea gravel concreten or cement mortar.
Further, for the protective layer when using pea gravel concreten, thickness is not less than 50mm；When using cement bonded sand
When slurry, thickness is not less than 20mm.
Preferably, in the step a after precipitation, which is cheated, to be arranged, hole foot mat is spread in precipitation is cheated immediately and builds earth-retaining
Wall, and smear earth-retaining mortar or concrete.
Preferably, precipitation hole depth is not less than the suction pump height+100mm.
Preferably, 20% of the total volume of the graded sand and stone not less than the total measurement (volume) that the precipitation is cheated.
Preferably, before the step f further includes overlap joint, pit body bottom waterproof layer overlap is carried out at cleaning and drying
The step of reason.
Preferably, the pit body be sump, elevator, it is a kind of in cushion cap foundation well.
Bottom setting precipitation at positions such as building sump, elevator, cushion cap foundation wells is cheated, and is placed and is drawn water in precipitation hole
Pump enriches underground water for extracting well internal surface layer construction ponding and substrate shallow-layer.Precipitation hole top sets cover board, and cover plate central is prefabricated
Casing or reserving hole, suction pump cable and drainpipe are pierced by out of casing.The waterproofs such as sump, elevator, cushion cap foundation well
It is laid with when layer construction to periphery of spigot and closes up, be laid with the separation layer and protective layer of waterproof layer.Before structural concrete pours, cutting row
Water pump cable and pipeline fill into precipitation hole from casing fill out graded sand and stone, Reperfu- sion concrete immediately, and finally sealed casing pours
Build sump structural concrete.
The present invention efficiently solves under underground space foundation bottom shallow-layer water source enriched environment, bedding plane located underground with
Under the positions such as sump, elevator, cushion cap foundation well inner product Water Spreading it is active, on the one hand, not can guarantee construction site
Waterproof layer operation in the environment of Wu Mingshui, causes waterproof layer that can not construct in shaft bottom basal plane；On the other hand, ponding makes to catchment
Well, elevator, cushion cap foundation well the structural concrete of bottom plate occur when pouring isolation, compactness is poor, cover to reinforcement is thick
Design requirement etc. is not achieved in degree, and the problem of structure safety is threatened so as to cause steel bar corrosion, concrete carbonization etc., spreads for waterproof layer
If having striven for the anhydrous operating condition of advantageous base with concreting, the construction of waterproof layer and concrete structure has been effectively ensured
Detailed description of the invention
Fig. 1 is that hypogee pit body pours pre-structure schematic diagram；
Fig. 2 is that hypogee pit body pours rear structural schematic diagram；
Wherein, 1- precipitation is cheated；11- precipitation cheats crater wall；12- precipitation hole hole bottom；13- graded sand and stone；14- cheats inner concrete；
2- suction pump；21- cable and drainpipe；3- cover board；31- casing；32- accelerated cement；4- waterproof layer；5- protective layer；6- precipitation
Hole top waterproof layer；7- pit body structural concrete.
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
As shown in Figure 1, cheating 1 in hypogee pit body bottom setting precipitation, suction pump 2 is placed in precipitation hole 1, for extracting
Well endosexine construction ponding and hole bottom phreatic water.1 top of precipitation hole sets cover board 3, the prefabricated casing 31 in 3 center of cover board or reserved
Hole, suction pump cable and drainpipe 21 are pierced by out of casing 31 or hole.Pit body bottom waterproof layer 4 is laid with to casing 31 or hole
Hole periphery is closed up, and is laid with protective layer 5 and is made insulation blocking to waterproof layer.Precipitation cheats 1 depth and is not less than suction pump height+100mm；Drop
Puddle figure can be cuboid-type, can also be cylinder.Cement mortar bedding cushion, pea gravel concreten pad can be used in precipitation hole hole bottom 12
Layer.When using cement mortar bedding cushion, thickness is not less than 20mm；When using pea gravel concreten bed course, thickness is not less than 40mm；
Precipitation hole crater wall 11 can be used the wide brick wall retaining wall of a stretcher, pea gravel concreten retaining wall, cement mortar retaining wall or not handle
Etc. modes, it is specific that regard soil property situation selected.3 periphery of cover board is beyond 1 top periphery 50mm of precipitation hole；Steel plate can be used in cover board material
(with a thickness of 3~8mm), precast concrete cover (with a thickness of 15~60mm) or template (including plank sheathing, glued board etc.)；Lid
Plate center sets casing or hole, and casing caliber or hole internal diameter are not less than 48mm；The gold that length is 10~100mm can be used in casing
Belong to pipe (such as shelf pipe), pvc pipe or other materials pipeline；Casing cannot stretch out lid surface；When using steel deck-plate, by metal
Casing is welded on steel plate center；When using precast concrete cover, the sleeve pipe pre-embedding heart in a mold is formed whole with cover board
Body, or sleeve is removed into hole；When using template, cuts or cut template center and form hole.Cover board upper surface preferably with
4 base of waterproof layer (bed course or screed-coat) surface maintains an equal level, to guarantee that waterproof layer 4 is smooth in pit body bottom base paving.Suction pump 2
Sewage pump, fresh water pump, immersible pump, booster pump etc. can be selected, which kind of type, suction pump the view water, sediment content of power selected
Depending on；Cable and drainpipe are pierced by out of casing.Pea gravel concreten or cement mortar can be used in protective layer 5.When mixed using microlith
When solidifying soil, thickness is not less than 50mm；When using cement mortar, thickness is not less than 20mm.
Before pouring hypogee pit body, draining pump cable and pipeline 21 are cut off, is filled out of casing 31 or hole fill out grade immediately
With sandstone 13, Reperfu- sion cheats inner concrete 14, finally sealed casing 31 or hole, as shown in Fig. 2, suction pump 2 is cut off draining
It is discarded after pump cable and pipeline 21 in precipitation hole 1, into precipitation hole 1, paving fills out certain thickness graded sand and stone 13 immediately, then pours
It builds concrete to precipitation and cheats hole top, and preferably use rapid hardening with 32 sealing sleeve pipe 31 of accelerated cement or hole, accelerated cement 32 rapidly
Type or retardation setting type waterproofing and leakage-stopping are precious.May be not yet pre-hardening because cheating inner concrete in sealing sleeve pipe, it is therefore, close using accelerated cement
Feng Shi, viscosity, group's size should determine according to field condition；Meanwhile upper surface should maintain an equal level with cover board, in favor of waterproof layer
It is laid with and cheats waterproof layer 6 at the top of one of precipitation hole of hole top laying in precipitation and cover precipitation hole, taken with surrounding pit body bottom waterproof layer 4
It connects, constitutes closure waterproof layer.Paving fills out graded sand and stone in precipitation is cheated, and then pours hole inner concrete, and graded sand and stone dosage is overall
20% of product not less than precipitation hole total measurement (volume)；The meaning of graded sand and stone is: as a kind of water storage level, residual is accumulated in accumulation hole
Water leaking-in before water and concreting influences the pouring quality of concrete to guarantee ponding and water leaking-in not.In precipitation hole
Casting concrete is laid with precipitation hole top waterproof layer and overlaps with pit body bottom waterproof layer, pour pit body to pit body shaft bottom plane
Structural concrete 7.The concrete material poured in pit body structural concrete 7 and dewatering well is identical.Such as waterproof layer overlap
It is contaminated, before precipitation cheats hole top waterproof layer and hole bottom waterproof layer overlap joint, preferably pit body bottom waterproof layer overlap is carried out clear
It reason and is dried, the method for drying process includes with sponge sucks in water, blowtorch or spray gun baking, heat gun heating and dehumidification etc. are arranged
It applies.Supplement is laid with protective layer after waterproof layer overlap joint, and pea gravel concreten or cement mortar can be used in protective layer.When using microlith coagulation
When native, thickness is not less than 50mm；When using cement mortar, thickness is not less than 20mm.
Above-mentioned, although specific embodiments of the present invention have been described, not to the limit of the scope of the present invention
System, for some technology contents well known to those of ordinary skill in the art, details are not described herein again, and one of ordinary skill in the art answer
This understands that based on the technical solutions of the present invention, those skilled in the art do not need to make the creative labor and can make
Various modifications or changes still within protection scope of the present invention.