CN103726673A - Novel after-rooting composite pile foundation - Google Patents
Novel after-rooting composite pile foundation Download PDFInfo
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- CN103726673A CN103726673A CN201410039026.7A CN201410039026A CN103726673A CN 103726673 A CN103726673 A CN 103726673A CN 201410039026 A CN201410039026 A CN 201410039026A CN 103726673 A CN103726673 A CN 103726673A
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Abstract
The invention relates to a novel after-rooting composite pile foundation. A hydraulic drill is used for drilling holes on a reinforced concrete floor (4) around a reinforced concrete column (3) on a reinforced concrete column base (2), the holes drilled by the hydraulic drill downwards penetrate through the reinforced concrete column base (2) from the reinforced concrete floor (4), an after-rooting high-pressure rotary jet grouting cement soil pile (9) is below the reinforced concrete column base (2), and the high-pressure rotary jet grouting cement soil pile (9) and the reinforced concrete column base (2) generate the novel after-rooting composite pile foundation under the action of high-pressure rotary jet grouting cement slurry. The after-rooting novel composite pile foundation disclosed by the invention can avoid taking down an old building at first and then building an old building pile foundation after excavation, so that the cost is saved; the after-rooting composite pile foundation achieves an effect of structural reinforcement to ensure that the novel after-rooting composite pile foundation works together with the original structure to improve the carrying capacity of the foundation and ensure the engineering quality of updated new structural engineering of the old building after reconstruction, floor increasing, rebuilding and expansion.
Description
Technical field
The present invention relates to the foundation structure of building field, the Novel composite pile foundation of particularly taking root after one; Belong to the technique of design and construction field of the underground structure reinstatement works of civil engineering class, especially belong to the based process technical field in civil engineering aging blocks strengthening reconstruction.
Background technology
Along with accelerating of Process of Urbanization Construction, the aging blocks engineering that renovates is a lot, so-called aging blocks renovate to reinforce and increase floor and include: the building cracking that irregular even sedimentation causes, high tower and the overage military service Qun building of inclination, and the built high building of change purposes urgent need increasing layer, be referred to as herein " aging blocks " (lower same).Prior art generally only limits to the strengthening reconstruction of the overground part of structure to aging blocks strengthening reconstruction, or after whole aging blocks are removed, carries out the transformation of underground pile foundation again; To the basis of former underground structure, technology or a blank on piling basis after aging blocks are not removed on indoor basis of not excavating.When can not meet superstructure, original underground base for post basis increases the supporting capacity after layer increase load, for making it meet bearing capacity demand, after utilizing existing technology just to only have existing building is removed and excavated, reconstruct again pile foundation, this improvement project amount is very large, this reforming mode of prior art, consumption wealth consumption power, has caused huge waste; How not destroying under the prerequisite of original base structure of aging blocks not removing aging blocks, descend over the ground base for post or the wall base to transform, is a great new research topic.
Content of the present invention
In order to make up the deficiencies in the prior art, fill up the blank of prior art, object of the present invention is just: provide a kind of and do not removing aging blocks, do not destroy aging blocks original base, do not excavate the original ground of aging blocks, and the key new of the pile foundation of taking root after under aging blocks original base, the Novel composite pile foundation of taking root after one is specifically provided, after having had the key technology of such Novel composite pile foundation, just can design new departure of diversified old building transforming and the pile foundation of the design scheme of various optimizations can be installed in the former basis of aging blocks and former ground and go, and can successfully put into practice.
The object of the invention is to be achieved through the following technical solutions:
The Novel composite pile foundation of taking root after one, comprises former
postbase and high-pressure rotary-spray cement earth pile 9; Its Central Plains
postbase comprises former reinforced concrete post 3, former steel concrete base for post 2, former steel concrete ground 4; The periphery that is exposed at outside the former reinforced concrete post 3 on former steel concrete ground 4 is provided with water and bores boring, the boring of described water penetrates former steel concrete base for post 2 downwards from former steel concrete ground 4, the below of former steel concrete base for post 2 is high-pressure rotary-spray cement earth piles 9, high-pressure rotary-spray cement earth pile 9 generates an entirety with former steel concrete base for post 2, the described entirety Novel composite pile foundation of taking root after being; High-pressure rotary-spray cement earth pile 9 former steel concrete base for post 2 and former reinforced concrete post 3 at the bottom of former steel concrete base for post 2 jacking.
Wherein: the pile foundation of taking root after described is by the bottom solum in the vertical hole of inserting the boring of described water of the high-pressure rotary-spray borer drill rod that injects water under high pressure mud, from the spud in downward cutting and grinding of high speed water slurry jet of High Rotation Speed of former steel concrete base for post 2 bottom solums, mix the soil body downwards, generating diameter is 600～1000m high-pressure rotary jet grouting pile, the downward cutting soil of drill bit on described high-pressure rotary-spray borer drill rod until after the design elevation place of taking root at the bottom of pile foundation stake.
Wherein: described water is drilled in former steel concrete ground 4, and the aperture of perforate on former steel concrete base for post 2 is 100～160mm.
Wherein: described water bores perforate and comprises boring 8 and boring 7, wherein hole and 8 run through former steel concrete ground 4, boring 7 is from former steel concrete ground 4 until penetrate former steel concrete base for post 2, and 7 the aperture of wherein holing is less than the aperture of boring 8.The aperture of boring 7 is less than this design in the aperture of boring 8, is convenient to workman's operation.The aperture of described boring 8 and boring 7, is greater than the diameter of high-pressure rotary-spray borer drill rod.
Wherein: the diameter of described high-pressure rotary-spray cement earth pile 9 is 0.6-1.0m.
Wherein: described high-pressure rotary-spray cement earth pile 9, to the material of pile body itself, coring pressure testing knows that its compressive strength is 12-25MPa.
Wherein, described high-pressure rotary-spray rig with it the operating pressure of supporting force (forcing) pump be 28-35MPa.
After the pile foundation support table (attached not shown) of taking root after also can setting up on the former steel concrete ground 4 of Novel composite pile foundation of taking root.
Below realization of the present invention is described further:
The Novel composite pile foundation of taking root after one, comprises former steel concrete base for post 2, former reinforced concrete post 3, former steel concrete ground 4 and high-pressure rotary-spray cement earth pile 9, the stake of taking root after underground being designed with of the periphery of the reinforced concrete post 3 on steel concrete ground 4, produce the stake of taking root after this, first the water on the steel concrete ground 4 of the periphery of selecting on position corresponding with it reinforced concrete post 3 of stake of will taking root after being designed with bores perforate 8, when its degree of depth is drilled into the end face of former steel concrete base for post 2, change the water drill bit of minor diameter, to former steel concrete base for post 2 perforates, be that water bores perforate 7, make perforate 7, the straight-through perforation of perforate 8, use again high-pressure rotary-spray rig, the drilling rod of this rig is vertically inserted in the soil layer at the bottom of the clear opening hole of perforate 7 and perforate 8, spud in downwards, brill limit, limit high-pressure rotary-spray cement paste, generate the high-pressure rotary-spray cement earth pile 9 that stake footpath is 600～1000mm, high-pressure rotary-spray cement earth pile 9 generates an entirety with steel concrete base for post 2, the described entirety Novel composite pile foundation of taking root after being, high-pressure rotary-spray cement earth pile 9 former steel concrete base for post 2 and former reinforced concrete post 3 at the bottom of former steel concrete base for post 2 jacking, the two combination interface of former steel concrete base for post 2 and high-pressure rotary-spray cement earth pile 9 process after its in conjunction with very tight.
Wherein, the pile foundation of taking root after described is by the vertical bottom solum that inserts described water brill perforate 7 and the perforate 8 of water brill of the high-pressure rotary-spray borer drill rod that injects water under high pressure mud, from steel concrete base for post 2 bottoms, the downward cutting soil of High Rotation Speed generates the high-pressure rotary jet grouting pile that stake footpath is 600～1000mm downward vertically, the water under high pressure mud jet that the drilling rod of described high-pressure rotary-spray rig sprays to backspin hit that the soil body is mixed in cutting until after carry behind the design elevation place of taking root at the bottom of pile foundation stake and bore multiple water-spray type slurry.
In the present invention, after take root the high-pressure rotary jet grouting pile under pile foundation diameter and stake is long by designing and calculating, drafts, designer increases layer according to aging blocks are renovated, or make full use of aging blocks resource and redesign the load that optimizing design scheme increases in new building, determine as calculated and design meet that supporting capacity requires after the composite pile of taking root
basis; Take root after simultaneously also can drafting according to the increased load external form shape of composite pile foundation, the long and stake footpath of the stake of the required friction pile of pile foundation of taking root after also can inverse, also can inverse and inquire into the high-pressure rotary-spray rig operating pressure matching of supporting high-pressure pump with it.Its supporting capacity of Novel composite pile foundation of taking root after of the present invention has obtained improving significantly, can meet the requirement of building transformation increasing layer increment of load completely.
Beneficial effect of the present invention:
During old building transforming, can utilize water brill perforate machinery and high-pressure rotary-spray rig supporting, the direct pile driving construction of taking root after water brill perforate and high-pressure rotary-spray are carried out in indoor one deck ground of aging blocks, the stake of can be directly taking root after the periphery water of the ground reinforced concrete post of one deck bores perforate high-pressure rotary-spray, also can be in indoor any point by designing requirement perforate on former concrete surface high-pressure rotary jet grouting pile of taking root after the underground soil layer of corresponding position, hole, can avoid removing the event generation of rebuilding the new basis of aging blocks after aging blocks, saved manpower, material resources, financial resources and public social resources, save construction investment, reduced construction costs, after the composite pile foundation of taking root played the effect of structural strengthening, the NEW TYPE OF COMPOSITE pile foundation of taking root after making and the old and new's structure co-operation, improved the supporting capacity of ground, guaranteed the quality of the aging blocks new construction engineering after renovating, make its intensity raising, functional rehabilitation, life, method is simple, easy to operate, cost is low, practical.
Accompanying drawing explanation
Fig. 1 is the former basic elevation of the aging blocks of overage military service;
Fig. 2 is the former foundation plans of the aging blocks of overage military service;
Fig. 3 is a new composite basis elevation of taking root after the indoor non-excavation of the non-dismounting of aging blocks;
Fig. 4 is a new composite foundation plan of taking root after the indoor non-excavation of the non-dismounting of aging blocks;
Wherein, the code name of all parts in accompanying drawing is expressed as:
1, the 37 lime earth of backfill;
2, former steel concrete base for post;
3, former reinforced concrete post;
4, former steel concrete ground;
5, former steel concrete ground level;
6, former steel concrete base for post substrate design absolute altitude;
7, water boring; 8, water boring; 9, high-pressure rotary-spray cement earth pile.
The specific embodiment
Below in conjunction with accompanying drawing 1-4, the invention will be further described:
Embodiment 1: Fig. 1 and Fig. 2 are the former pattens of former aging blocks, comprise the 37 lime earth 1 of former reinforced concrete post 3, former steel concrete base for post 2, former steel concrete ground 4, former backfill;
The composite pile novel foundation of taking root after after Fig. 3 and Fig. 4 renovate:
In Fig. 3 and Fig. 4, the Novel composite pile foundation of taking root after one, comprises former steel concrete base for post 2, reinforced concrete post 3, steel concrete ground 4, and high-pressure rotary-spray cement earth pile 9, the periphery water of the reinforced concrete post 3 on steel concrete ground 4 bores perforate, position, perforate hole needs to determine according to design, described water bores perforate and penetrates steel concrete base for post 2 downwards from steel concrete ground 4, with the drilling rod of rig and drill bit vertically through boring 8, boring 7 enters stratum, starting high-pressure rotary-spray borer drill rod spuds in downwards until carry brill after the design elevation at the stake end, below former steel concrete base for post 2, by designing requirement, generated high-pressure rotary-spray cement earth pile 9 like this, high-pressure rotary-spray cement earth pile 9 generates an entirety with former steel concrete base for post 2, the described entirety Novel composite pile foundation of taking root after being, high-pressure rotary-spray cement earth pile 9 former steel concrete base for post 2 and former reinforced concrete post 3 and former steel concrete ground 4 at the bottom of former steel concrete base for post 2 jacking.
Wherein, the pile foundation of taking root after described is by vertical the insertion in described boring of drilling rod of high-pressure rotary-spray rig of injecting water under high pressure mud, and from steel concrete base for post 2 bottom solums, the lower high speed water slurry jet that bores revolves
turnmix downwards to revolve to hit cutting soil and whitewash and generate the high-pressure rotary jet grouting pile that diameter is 600～1000mm, described high-pressure rotary-spray borer drill rod utilize the jet energy of cement paste to mix cutting soil downwards until after the take root design elevation place at the stake stake end, complete design stake is long makes a task.
Wherein, the described aperture to aging blocks ground 4 and the 2 waters brill perforates of steel concrete base for post is 100～160mm.Described to aging blocks steel concrete ground 4 and the 2 waters brill perforates of former steel concrete base for post, comprise perforate 8 and perforate 7, wherein the perforate 8 of water brill runs through steel concrete ground 4, water bores perforate 7 from steel concrete ground 4 until penetrate the bottom of steel concrete base for post 2, and wherein the aperture of perforate 7 is less than the aperture of perforate 8.The aperture of perforate 7 is less than this design in the aperture of perforate 8, is convenient to workman's operation.
Wherein, the diameter of described high-pressure rotary-spray cement earth pile 9 is 0.6-1.0m; Self core compressive strength of described high-pressure rotary-spray cement earth pile 9 is 12-25MPa; The supporting high-pressure pump of described and high-pressure rotary-spray rig operating pressure be 28-35MPa.In the present invention, after take root design elevation at the bottom of pile foundation stake and after the take root diameter of stake all according to the load bearing requirements of floor, design, take root after the different design elevation at the stake end of stake, the size of the corresponding high-pressure rotary-spray cement earth pile forming and intensity are all different, can regulate according to actual needs; The intensity of pile foundation king-pile of taking root after simultaneously forming as required and the size of stake diameter are carried out inverse and are selected the high-pressure rotary-spray rig operating pressure of supporting high-pressure pump with it.
Specific construction process: utilize water to bore tapping machine perforate 8 on the steel concrete ground 4 of the periphery of indoor reinforced concrete post 3, the aperture of perforate 8 is 100～160mm, after drilling, steel concrete ground 4 uses the drill bit of minor diameter instead, water is drilled on reinforced concrete 2 and holes 7, the aperture of boring 7 is greater than 100mm (water bores the diameter that opening diameter is greater than high-pressure rotary-spray borer drill rod), boring 7, hole after 8 perforates, the soil layer of perforate 7 and perforate 8 inner bottom parts is bored in the stake of taking root after described by the described water of the vertical insertion of drilling rod of the high-pressure rotary-spray rig of injection water under high pressure mud, boring 7 from former steel concrete base for post 2 lower bore vertical with boring 8, carry out high-pressure rotary-spray, the drilling rod of high-pressure rotary-spray rig drill bit sidewall is foremost provided with one of 2.5mm single hole, under the pressure of 28～35MPa, single hole jet stack, its range is larger, jet stack generates around drilling rod High Rotation Speed limit water-spray type slurry the high-pressure rotary jet grouting pile that diameter is 600～1000mm, described high-pressure rotary-spray borer drill rod to side bets slurry while mixing cutting soil until after the stake design elevation place at the stake end of taking root.The hollow drill of the miniature galianconism rig by High Rotation Speed injects water under high pressure mud slurries, utilize the energy of the high-pressure spray circumgyration incision soil body, form high-pressure rotary-spray cement earth pile 9, high-pressure rotary-spray cement earth pile 9 has generated an entirety with steel concrete base for post 2, and former steel concrete base for post 2 and reinforced concrete post 3 at the bottom of steel concrete base for post 2 jacking, formed a compound Novel pile basis, thereby complete former steel concrete base for post basis after the stake of taking root, the NEW TYPE OF COMPOSITE pile foundation of taking root after making and the old and new's structure co-operation, shared old building transforming increases the load of layer increment of load, improved the supporting capacity of ground, having met aging blocks renovates and increases the higher requirement that load improves bearing capacity of foundation soil.
The hole of the not slip casting of water brill perforate 7 and the perforate 8 of water brill, after the complete completion of works of inspection of quality, substitutes second stage concrete sealing of hole with high-grade cement mortar floating.
The ground floor of general aging blocks building for business lives dual-purpose its space all higher, generally can meet MGJ-50 rig and enter the requirement of indoor construction action required height space; After the take root realization of composite pile foundation, can avoid removing and rebuild aging blocks basis transformation aging blocks event after aging blocks and occur, saved human and material resources, financial resources and public social resources.Save construction investment, reduced construction costs.After the take root appearance structure of composite pile foundation completely different from original structure, after take root side that stake oval all sides developed area corresponding to increased root produce with the soil body rub compared with the bearing capacity of power and original structure ground and exceed several times, its supporting capacity has obtained significantly improving.Play the effect of structural strengthening, guaranteed the quality of the aging blocks new construction engineering after renovating.Make himself intensity raising, bearing capacity raising, functional rehabilitation, life, method is simple, easy to operate, cost is low, practical.
The present invention can be directly on former aging blocks one deck steel concrete ground 4 water bore after perforate 8, and then to underground steel concrete base for post 2 perforates, again the drill bit on high-pressure rotary-spray borer drill rod is vertically inserted to perforate 7, in the soil layer of 8 inner bottom parts, with coaxial lower bore and high-pressure rotary-spray cement paste utilizes high speed water slurry jet to revolve to hit wave-wave to break up the broken high-strength rotary churning pile 9 that mixes the soil body and generate stake footpath 600～1000mm vertically downward in hole, after high-strength rotary churning pile 9 final set with former steel concrete base for post 2 and former reinforced concrete post 3 and former steel concrete ground 4 is common forms a compound new basis, can avoid first removing aging blocks, after excavation, build again the generation of the pile foundation event of aging blocks, cost-saving, after the composite pile foundation of taking root played the effect of structural strengthening, the NEW TYPE OF COMPOSITE pile foundation of taking root after making and original structure co-operation, improved the supporting capacity of ground, guaranteed that aging blocks increase the workmanship of the brand-new new construction engineering that layer or reorganization and expansion improvement project regenerate.
Wherein, after the pile foundation support table of taking root after setting up on the former steel concrete ground 4 of Novel composite pile foundation of taking root.If take root pile foundation support table after having set up in the working drawing in the prioritization scheme figure of newly-designed old building transforming engineering, the new piling foundation plan that can arrange by working drawing, ground respective seat in aging blocks is put on water and is bored perforate, set up in advance the high-pressure rotary jet grouting pile of taking root after numerous, the pile cap (cast-in-situ concrete of cloth reinforced mesh forms thick bearing sheet) of taking root is set after subsequently can be on the ground on former steel concrete ground 4 and forms novel clump of piles composite pile foundation cushion cap platform.
It is worth mentioning that: the present invention is used in the increasing layer increment of load project in old building transforming and all can makes bearing capacity of foundation soil improve, and meets the engineering demand that design improves bearing capacity of foundation soil; Also can be used in and make full use of aging blocks resource and redesign new building, the basis in Jiang Qixin building again install jacking under the original base that is arranged into aging blocks and after take root and support the various loads of the newly built construction after renovating, make it to form compound Novel pile basis and compound structural engineering, make it to meet every technical specification of engineering design and the requirement of rules.Utilize key technology of the present invention without the existing building of dismantling, the composite pile of taking root after directly utilizing, the NEW TYPE OF COMPOSITE pile foundation of taking root after making and the old and new's structure co-operation, shared old building transforming increases the load of layer increment of load.Improved the supporting capacity of ground, met aging blocks and renovated and increase the higher requirement that load improves bearing capacity of foundation soil, integrated to greatest extent and utilized various resources, turn waste into wealth, make refuse not useless, make refuse repeat to recover to use function, extend its application life; In addition, if a building has bundle pillar base for post, the bearing capacity that bundle pillar can be passed to ground carries out stress distribution, set up multiple the present invention relates to after the Novel composite pile foundation of taking root, form a comprehensive clump of piles complex mass-type foundation.
Above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Everyly belong to apparent variation or the still row in protection scope of the present invention of variation that technical scheme of the present invention extends out.
Claims (8)
1. the Novel composite pile foundation of taking root after, is characterized in that: comprise former pile foundation and high-pressure rotary-spray cement earth pile (9); Its Central Plains pile foundation comprises former reinforced concrete post (3), former steel concrete base for post (2), former steel concrete ground (4); The periphery of the former reinforced concrete post (3) on former steel concrete ground (4) is provided with water and bores boring, the boring of described water penetrates former steel concrete base for post (2) downwards from former steel concrete ground (4), the below of former steel concrete base for post (2) is high-pressure rotary-spray cement earth pile (9), high-pressure rotary-spray cement earth pile (9) and former steel concrete base for post (2) generate an entirety, the described entirety Novel composite pile foundation of taking root after being; High-pressure rotary-spray cement earth pile (9) former steel concrete base for post (2) and former reinforced concrete post (3) at the bottom jacking of former steel concrete base for post (2).
2. the Novel composite pile foundation of taking root after one according to claim 1, it is characterized in that: the pile foundation of taking root after described is to be inserted in described boring and formed from the downward cutting soil of former steel concrete base for post (2) bottom High Rotation Speed by the high-pressure rotary-spray rig that injects water under high pressure mud, the downward cutting soil of described high-pressure rotary-spray rig until after the design elevation place of taking root at the bottom of pile foundation stake.
3. according to the Novel composite pile foundation of taking root after one described in claim 1 or 2, it is characterized in that: the aperture that described water bores boring is 100～160mm.
4. the Novel composite pile foundation of taking root after one according to claim 3, it is characterized in that: the boring of described water comprises boring (8) and boring (7), wherein boring (8) runs through former steel concrete ground (4), hole (7) from former steel concrete ground (4) until penetrate former steel concrete base for post (2), wherein the aperture of boring (7) is less than the aperture of boring (8).
5. the Novel composite pile foundation of taking root after one according to claim 4, is characterized in that: the hole aperture of (7) of described water boring (8) and water, is all greater than the diameter of high-pressure rotary-spray borer drill rod.
6. the Novel composite pile foundation of taking root after one according to claim 1, is characterized in that: the diameter of described high-pressure rotary-spray cement earth pile (9) is 0.6-1.0m, with the pressure of the supporting high-pressure pump of high-pressure rotary-spray rig at 28～35MPa.
7. the Novel composite pile foundation of taking root after one according to claim 1, is characterized in that: the compressive strength of described high-pressure rotary-spray cement earth pile (9) is 12-25MPa.
8. the Novel composite pile foundation of taking root after one according to claim 1, is characterized in that: after the pile foundation support table of taking root after can setting up on the former steel concrete ground (4) of Novel composite pile foundation of taking root.
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| CN201410039026.7A CN103726673A (en) | 2014-01-27 | 2014-01-27 | Novel after-rooting composite pile foundation |
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| CN201410039026.7A CN103726673A (en) | 2014-01-27 | 2014-01-27 | Novel after-rooting composite pile foundation |
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