Increase the construction method of basement structure behind strip footing house
Technical field
The present invention relates to basement structure is increased after one kind, in particular to increase the construction of basement structure behind strip footing house
Method.
Background technique
With urbanization construction go deep into, the requirement in garage is higher and higher, part house because functional requirement is transformed,
Existing building lower part increases basement, but is related to many structure problems in the process for increasing basement, and such as: original basis cushion cap is logical
It is frequently located in basement position, if structural bearing capacity cannot be met the requirements after removal, even if newly-increased reinforcing pile, reinforcing pile and former work
Journey stake rigidity mismatches.In addition, during structure of modification, it is also noted that the waterproof problem of basement.
Summary of the invention
The present invention is to provide the construction method for increasing basement structure behind a kind of strip footing house, solves asking for the prior art
Topic.
For this purpose, support replacement beam is arranged in load bearing wall bottom, support replacement depth of beam is 60~90cm, and support replacement beam width is 30cm, support replacement
Case bay be 1.1~1.5m, support replacement beam concrete strength be C30 or more than, support replacement beam is shelved on load wall, load wall width
For 30cm, load wall depth is 2~3 times of design of basement height, load wall concrete strength be C30 or more than.It reinforces
Support replacement 30~40cm of beam, weld horizontal anchor rib at the top of reinforcing pile are protruded into stake, and anchor rib length is 50~60cm, reinforcement and support replacement
Beam connection.Pile extension is set above engineering pile, bumper pad is set between pile extension and support replacement beam, and bumper pad is with a thickness of 10cm.?
Muscle is welded to connect on the outside of steel bar stress, dowel is square, welds seal ring in basement bottom board medium position, seal ring is straight
Diameter is 30~40mm, and seal ring is with a thickness of 3mm.Support replacement beam is in pile extension position setting shear reinforcement to avoid punching failure, shearing resistance
For reinforcing bar in bowl-shape, shear reinforcement diameter is 25mm or 28mm.Basement bottom board is with a thickness of 30cm, the setting of basement bottom board top
Waterproof mortar, for waterproof mortar with a thickness of 10~20cm, waterproof mortar intensity is M10.It is easy between load wall and basement bottom board
Waterproof steel plate is arranged in the internal corner part of load wall and basement bottom board handover in leakage, and waterproof steel plate is with a thickness of 3~5mm.
Construction procedure includes:
(1) reinforcing pile is pressed into soil, the weld horizontal anchor rib at the top of reinforcing pile.
Reinforcing pile uses small-sized tubular pole, due to that in house interior construction, can only carry out piling using small machine, when construction
Using the weight of existing building as pressurization counter-force.In addition, being sealed to make reinforcing pile give full play to load effect using prestressing force
Stake.
Construction technology is using as follows:
(1) pile crown is handled.Pile crown leveling is guaranteed in order to which future makes force transmission shaft completely attach to pile crown in envelope stake
Its stress equalization.The levelling construction of pile crown uses sulphide mastic, can pressurize after screed-coat reaches intensity requirement and seal stake.
(2) prestressed seals stake device.Prestressed is carried out in the following order and seals stake device: 1. steel pad is installed
Plate and power transmission steel column, 2. install force transmission beam, 3. install upper cap nut, 4. install jack, 5. install pressure pile reaction beam.Each component
Middle line alignment guarantees the power energy symmetrical equilibrium application of jack during piling, it is ensured that force transmission beam has enough displacement spaces,
Jack is caused to be unable to reach requirement to avoid because displacement is excessive.
(3) secondary piling.Envelope stake device starts to carry out secondary piling to reinforcing pile after the installation is completed, and secondary piling is most
Big pressure is the design final pressure value of reinforcing pile.When jack reach design final pressure value, nut is tightened, use double nut fastening with
Guarantee envelope stake effect, after tightening nuts, cannot horse back release, jack should be made to keep design pressure, after a period of stabilisation, then
After secondary fastening nut, release can be carried out to jack.
(4) jack and pile driving frame are shed.After the complete release of jack, jack and pile driving frame can be gradually removed.
(5) envelope pile concrete is poured.Pile concrete is sealed using expansion early strength concrete.
(2) construction load wall.
Load is married again since load wall not only undertakes support replacement beam, also to prevent the water room of permeating the ground around house from applying
Workshop, so to carry out the seepage control measure of load wall, the especially load wall joint position weak link that is antiseepage.Load wall
Using channel steel joint form, first slotted line steel reinforcement cage both ends are welded with channel steel, and the steel reinforcement cage both ends of subsequent slot section are embedded in channel steel.By
It is big in load wall depth, it is all risen with connector case on rear side of channel steel and pulls out that difficulty is big, and lower part is backfilled using sand pocket, top 24m uses terraced
The form of shape connector case backfill, can effectively prevent concrete flow-disturbing.Sand pocket, which is filled, to be transported to aperture using small-sized machine and manually throws
Fill out method, prevent it is mechanically direct topple over, two sides are filled simultaneously, and steel reinforcement cage is prevented to be subjected to displacement.To guarantee sand pocket compactness, using ladder
Shape connector case carries out shock compaction after often filling in 2~3m.Filling depth every time is 0.4~0.6m, erection joint after sand pocket compacting
Case, connector case is critical to lean on channel steel, if any gap after connector case, it is necessary to fill up compacting with sand pocket.
Underwater gliders use internal diameter for the quick coupling steel conduit of 250mm, save a length of 3m, and most next section length is
4m.Mouth is away from 300~500mm of bottom hole under conduit.2 conduits are arranged in standard cell section, and conduit spacing is less than 3m, and conduit is away from slot section end
No more than 1.5m, balanced rising is answered in slot inner concrete face, and the concrete surface height difference at two conduits is not more than 0.5m, pours coagulation eventually
Native face elevation should be higher than that design requirement 0.5m.
(3) it excavates ground to support replacement beam bottom portion or less 5cm and does brick fetal membrane.
(4) support replacement beam steel is bound, support replacement beam concrete is poured.
(5) earth excavation cuts bar shaped cushion cap and foundation beam concrete to bar shaped cushion cap bottom.
(6) 20~30cm below spoil to basement bottom board bottom absolute altitude carries out pile connection construction.
Pile connection construction uses following technical scheme:
Pile extension uses tubular pole.Engineering pile top rebars welding flange, engineering pile and tubular pole bottom use flanged joint.?
Binding it is good and be welded with the steel reinforcement cage of supporting plate be put into pile pipe it is hollow in, casting concrete forms core stake, core pile length is 1.5~
1.8m, core pile concrete intensity are greater than or equal to C30, and core stake shearing resistance stirrup diameter is 12mm, and spacing is 5~10cm.
Pile connection construction also uses following technical scheme:
Pile extension uses in situ concrete pile.First remove engineering pile top concrete, exposed engineering pile top rebars, top steel
The exposed length of muscle is 20~30mm, the principal rod of exposed reinforcement welding in situ concrete pile, in situ concrete pile at the top of engineering pile
Steel pile casting is installed, then casting concrete after reinforcement installation.
(7) bumper pad is placed after stake top leveling after pile connection construction.
Bumper pad is set between support replacement beam and pile extension in the present invention and plays the role of compatible deformation, due to former strip footing
Rigidity is larger, and the rigidity of anchoring pile is relatively small, can alleviate the two poor rigidity by bumper pad setting, stress is involutory
Reason.Valve rubber can alleviate the punching shear that engineering pile passes over simultaneously.
(8) engineering pile and basement bottom board delivery position are cut into concrete, exposed steel bar stress, on the outside of steel bar stress
It is welded to connect muscle, dowel is square, seal ring is welded in basement bottom board medium position, to block infiltration path.
(9) waterproof steel plate for burying load wall and basement bottom board handover internal corner part, is laid with basement bottom board reinforcing bar, pours
Build basement bottom board concrete.
(10) construction basement bottom board top waterproof mortar.
The present invention takes full advantage of the characteristics of original strip footing, and construction quality is easy to ensure, structural behaviour is good, operation
It is convenient.
Detailed description of the invention
Fig. 1 be strip footing house after increase structural schematic diagram.
In each attached drawing: 1, support replacement beam, 2, shear reinforcement, 3, reinforcing pile, 4, engineering pile, 5, dowel, 6, seal ring, 7,
Lower room bottom plate, 8, waterproof mortar, 9, waterproof steel plate, 10, load wall, 11, bumper pad, 12, pile extension, 13, load bearing wall.
Specific embodiment
Support replacement beam 1 is arranged in 13 bottom of load bearing wall, and 1 height of support replacement beam is 60~90cm, and 1 width of support replacement beam is 30cm, support replacement
1 spacing of beam is 1.2m, and 1 concrete strength of support replacement beam is C30, and support replacement beam 1 is shelved on waterproof steel plate 9, and 9 width of waterproof steel plate is
30cm, 9 depth of waterproof steel plate are 2.5 times of design of basement height, and 9 concrete strength of waterproof steel plate is C30.Reinforcing pile 3 is stretched
Enter support replacement beam 35cm, 3 top weld horizontal anchor rib of reinforcing pile, anchor rib length is 55cm, and reinforcement is connect with support replacement beam 1.Work
Pile extension 12 is arranged in journey stake 4 above, bumper pad 11 is arranged between pile extension 12 and support replacement beam 1, bumper pad 11 is with a thickness of 10cm.?
Muscle 5 is welded to connect on the outside of steel bar stress, dowel 5 is square, welds seal ring 6, sealing in basement bottom board medium position
6 diameter of ring is 35mm, and seal ring 6 is with a thickness of 3mm.Support replacement beam 1 is broken to avoid punching in 12 position of pile extension setting shear reinforcement 2
Bad, for shear reinforcement 2 in bowl-shape, 2 diameter of shear reinforcement is 25mm.Basement bottom board 7 is with a thickness of 30cm, 7 top of basement bottom board
Waterproof mortar 8 is set, and for waterproof mortar 8 with a thickness of 15cm, waterproof mortar Final 8 degree is M10.In waterproof steel plate 9 and basement bottom board 7
Waterproof steel plate 9 is arranged in the internal corner part of handover, and waterproof steel plate 9 is with a thickness of 4mm.
Construction procedure includes:
(1) reinforcing pile 3 is pressed into soil, in 3 top weld horizontal anchor rib of reinforcing pile.
Reinforcing pile 3 uses small-sized tubular pole, applies the weight of utilization of hour existing building as pressurization counter-force, is sealed using prestressing force
Stake.
Construction technology is using as follows:
(1) pile crown is handled.Pile crown leveling is guaranteed in order to which future makes force transmission shaft completely attach to pile crown in envelope stake
Its stress equalization.The levelling construction of pile crown uses sulphide mastic, can pressurize after screed-coat reaches intensity requirement and seal stake.
(2) prestressed seals stake device.Prestressed is carried out in the following order and seals stake device: 1. steel pad is installed
Plate and power transmission steel column, 2. install force transmission beam, 3. install upper cap nut, 4. install jack, 5. install pressure pile reaction beam.Each component
Middle line is aligned when construction, guarantees the power energy symmetrical equilibrium application of jack during piling, it is ensured that force transmission beam has enough positions
Space is moved, causes jack to be unable to reach requirement to avoid because displacement is excessive.
(3) secondary piling.Envelope stake device starts to carry out reinforcing pile 3 secondary piling after the installation is completed, and secondary piling is most
Big pressure is the design final pressure value of reinforcing pile 3.Final pressure value is designed when jack reaches, nut is tightened, is fastened using double nut
To guarantee to seal stake effect, after tightening nuts, cannot horse back release, jack should be made to keep design pressure, after a period of stabilisation,
Again after fastening nut, release can be carried out to jack.
(4) jack and pile driving frame are shed.After the complete release of jack, jack and pile driving frame can be gradually removed.
(5) envelope pile concrete is poured.Pile concrete is sealed using expansion early strength concrete.
(2) construction waterproof steel plate 9.
Waterproof steel plate 9 uses channel steel joint form, and first slotted line steel reinforcement cage both ends are welded with channel steel, the steel reinforcement cage of subsequent slot section
Both ends are embedded in channel steel.It is all risen with connector case since 9 depth of waterproof steel plate is big, on rear side of channel steel and pulls out that difficulty is big, and lower part is using sand
Bag backfill, top 24m use the form of trapezoidal connector case backfill, can effectively prevent concrete flow-disturbing.Sand pocket is filled using small
Type machinery is transported to the artificial throwing method in aperture, prevent it is mechanically direct topple over, two sides are filled simultaneously, and steel reinforcement cage is prevented to be subjected to displacement.For
Guarantee that sand pocket compactness carries out shock compaction after often filling in 2~3m using trapezoidal connector case.Every time fill depth be 0.4~
0.6m, erection joint case after sand pocket compacting, connector case is critical to lean on channel steel, if any gap after connector case, it is necessary to fill up pressure with sand pocket
It is real.
Underwater gliders use internal diameter for the quick coupling steel conduit of 250mm, save a length of 3m, and most next section length is
4m.Mouth is away from 300~500mm of bottom hole under conduit.2 conduits are arranged in standard cell section, and conduit spacing is less than 3m, and conduit is away from slot section end
No more than 1.5m, balanced rising is answered in slot inner concrete face, and the concrete surface height difference at two conduits is not more than 0.5m, pours coagulation eventually
Native face elevation should be higher than that design requirement 0.5m.
(3) it excavates ground to 1 bottom of support replacement beam or less 5cm and does brick fetal membrane.
(4) 1 reinforcing bar of support replacement beam is bound, 1 concrete of support replacement beam is poured.
(5) earth excavation cuts bar shaped cushion cap and foundation beam concrete to bar shaped cushion cap bottom.
(6) 20~30cm below spoil to 7 bottom absolute altitude of basement bottom board carries out pile extension 12 and constructs.
The construction of pile extension 12 uses following technical scheme:
Pile extension 12 uses tubular pole.4 top rebars welding flange of engineering pile, engineering pile 4 and tubular pole bottom are connected using flange
It connects.Binding it is good and be welded with the steel reinforcement cage of supporting plate be put into pile pipe it is hollow in, casting concrete forms core stake, and core pile length is
1.7m, core pile concrete intensity are equal to C30, and core stake shearing resistance stirrup diameter is 12mm, and spacing is 5~10cm.
(7) bumper pad 11 is placed after stake top leveling after pile extension 12 is constructed.
(8) engineering pile 4 and 7 delivery position of basement bottom board are cut into concrete, exposed steel bar stress, outside steel bar stress
Side is welded to connect muscle 5, and dowel 5 is square, seal ring 6 is welded in 7 medium position of basement bottom board, to block water seepage road
Diameter.
(9) it buries waterproof steel plate 9 and basement bottom board 7 joins the waterproof steel plate 9 of internal corner part, be laid with basement bottom board 7
Reinforcing bar pours 7 concrete of basement bottom board.
(10) construction 7 top waterproof mortar 8 of basement bottom board.