CN207659986U - A kind of building or structures foundation stabilization underpin pier - Google Patents

A kind of building or structures foundation stabilization underpin pier Download PDF

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Publication number
CN207659986U
CN207659986U CN201721401390.9U CN201721401390U CN207659986U CN 207659986 U CN207659986 U CN 207659986U CN 201721401390 U CN201721401390 U CN 201721401390U CN 207659986 U CN207659986 U CN 207659986U
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steel
pier
underpin
pipe
building
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CN201721401390.9U
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王建平
刘明星
张庆符
冯杨
姚修文
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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Abstract

The utility model discloses a kind of buildings or structures foundation stabilizations to underpin pier, includes that multiple below buildings or structures substrate underpin pier, the pier that underpins is internally provided with coaxial steel-pipe pile;One piece of center is fixed at the steel-pipe pile upper end opening opens round-meshed stake top steel plate;Be fixed on the stake top steel plate with steel-pipe pile it is coaxial underpin steel pipe, the steel pipe upper end that underpins is contacted with basement bottom of the building;Slip casting pipe fitting is prefabricated on steel pipe side wall in described underpin;It is evenly equipped with multiple slurry outlets on the side wall of the steel-pipe pile lower end.The utility model underpins steel-pipe pile by being pushed down into advance in substrate, can avoid underpining pier construction period cause existing building basis and superstructure generate it is additional sink, especially suitable for structure foundation accident treatment and basis is preventative underpins.Meanwhile the bearing capacity for underpining pier is greatly improved in the utility model, reduces settlement of foundation.

Description

A kind of building or structures foundation stabilization underpin pier
Technical field
The utility model belongs to ground and strengthening of foundation technical field in civil engineering, and in particular to one kind is built (structure) It builds object foundation stabilization and underpins pier.
Background technology
Pier formula underpinning technique be ground with basic accident treatment or it is preventative underpin in common method, be widely used in Gu Building lot is reinforced, in Existing reinforced concrete bridge add-story reconstruction foundation reinforcement and buildings or structures deviation rectifying project.The underpinning technique is suitable for A variety of base forms such as strip footing, isolated footing and raft foundation.Traditional pier formula underpinning technique is directly to be built existing Borehole under (structure) object substrate, the supporting course of depth to design requirement, then concrete perfusion formation underpin pier.It is generally straight to underpin pier Diameter is larger, depth is limited, and pier hole mostly uses hand excavation.The bearing capacity for underpining pier depends primarily on the compression strength of pier shaft material With the bearing capacity of pier bottom supporting course foundation soil.Presently, there are problems with for pier formula underpinning technique:(1) pier hole excavation construction can cause The weakening of former base floor space necessarily causes former buildings or structures basis and superstructure to generate additional sinking;(2) pier shaft concrete In filling process, it may occur that isolation, presss from both sides the defects of mud at necking down, causes pier shaft material compression strength to be not easy to ensure, direct shadow Ring the bearing capacity for underpining pier;(3) underpining pier bottom portion foundation soil cannot effectively be reinforced, and the bottom bearing for underpining pier is difficult to ensure; (4) for deviation rectifying project, inclination rectification construction must can carry out after underpining pier intensity and reaching 28 day age, and construction period is longer. Therefore, studying and design a kind of new buildings or structures foundation stabilization, to underpin pier very necessary and urgent.
Invention content
Defect present in for the above-mentioned prior art or deficiency, the purpose of the utility model is to provide one kind to build (structure) builds object foundation stabilization and underpins pier.
In order to achieve the above object, technical solution used by the utility model is as follows:
A kind of buildings or structures foundation stabilization underpins pier, includes that multiple below buildings or structures substrate underpin Pier, the pier that underpins are internally provided with coaxial steel-pipe pile;One piece of center is fixed at the steel-pipe pile upper end opening is provided with circle The stake top steel plate in hole;Be fixed on the stake top steel plate with steel-pipe pile it is coaxial underpin steel pipe, it is described underpin steel pipe upper end with Basement bottom of the building contacts;Slip casting pipe fitting is prefabricated on steel pipe side wall in described underpin;On the side wall of the steel-pipe pile lower end It is evenly equipped with multiple slurry outlets.
Further, the one circle strainer of package on the outer wall of steel-pipe pile that the slurry outlet is distributed with.
Further, water permeable membrane is wound in the outside of the strainer.
Further, it is equipped with a shoe in the bottom end of steel-pipe pile, the shoe is that bottom surface radius is more than falling for steel pipe radius Circular cone.
Further, in the steel pipe walls within the scope of 500mm, the slurry outlet that is of five storeys is arranged in steel pipe short transverse.
Further, the slurry outlet is circle, and aperture is Φ 6, pitch of holes 50mm, the distance of upper layer and lower layer slurry outlet For 100mm.
Further, it is equipped with a shoe in the bottom end of the steel-pipe pile, the shoe is that bottom surface radius is more than steel pipe radius Inverted cone.
Further, the cone angle of the inverted cone is not more than 60 degree.
Compared with existing pier formula underpinning technique, the utility model has the advantages that:
(1) the utility model underpins steel-pipe pile by being pushed down into advance in substrate, can avoid underpining pier construction period and draw It plays existing buildings or structures basis and superstructure generates additional sinking, especially suitable for structure foundation accident treatment and basis It is preventative to underpin.
(2) bearing capacity for underpining pier is greatly improved in the utility model.By to pier bottom supporting course post jacking, making slurries There is the effects that apparent scattering and permeating, compacted, reinforcing and part expansion are expanding in pier bottom portion foundation soil, to increase support The bottom bearing of pier is changed, and settlement of foundation can be reduced.
(3) the utility model significantly improves the compression strength for underpining pier.Steel-pipe pile is combined into stiffness with pier shaft coagulation local soil type Concrete structure, forms composite material, and bearing capacity greatly improves.
(4) substrate position uses slightly expanded concrete, avoids in concrete coagulation hardening process and causes to mix due to shrinking The problem of solidifying soil comes to nothing with substrate;
(5) the utility model has many advantages, such as that the construction period is short, at low cost.After the completion of underpining pier construction, you can carry out Superstructure Construction, no construction interval, shortens the duration, has saved cost.
Description of the drawings
Fig. 1 is the structural schematic diagram of the buildings or structures foundation underpinning pier of the utility model;
Fig. 2 is the A-A direction views of Fig. 1;
Fig. 3 is the drawing of Fig. 1 nodes 2;
Fig. 4 is the drawing of Fig. 1 nodes 1.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Specific implementation mode
Referring to Fig. 1~Fig. 4, the buildings or structures foundation stabilization of the utility model underpins pier, including is mounted on and builds (structure) and build Multiple below object substrate underpin pier 5, and the pier 5 that underpins is internally provided with coaxial steel-pipe pile 4;4 upper end of the steel-pipe pile Opening fixes one piece of center and opens round-meshed stake top steel plate 10;It is fixed on the stake top steel plate 10 coaxial with steel-pipe pile 4 Underpin steel pipe 2,2 upper end of steel pipe that underpins is contacted with basement bottom of the building 1;In described underpin note is prefabricated on 2 side wall of steel pipe Starch pipe fitting 7.
For the ease of construction, the multistage steel pipe that length is 1.0~1.5m is pre-machined into steel pipe;On first steel pipe Remaining vertically-mounted steel pipe of Fang Yici, alternately by constantly piling, pile extension, site welding is integral between steel pipe, Until the length of the following steel-pipe pile of the building bottom of foundation 4 >=pier design length+1000mm is underpined to get to steel-pipe pile 4.
In order to increase the bottom end bearing capacity for underpining pier 5, while settlement of foundation is reduced, as shown in figure 3, in 4 lower end of steel-pipe pile Side wall on be evenly equipped with multiple slurry outlets 12, these slurry outlets 12 can make the cement grout into steel-pipe pile 4 directly penetrate into steel It is spread in the stratum at tube bottom end and along hole.Through experiment, in steel pipe walls within the scope of 500mm, arranged in steel pipe short transverse 5 layers of slurry outlet.Preferably, slurry outlet 12 is circle, and circle can equably be spread;Its preferred aperture is Φ 6, and pitch of holes is The distance of 50mm, upper layer and lower layer slurry outlet 12 are 100mm.
In addition, in order to make steel pipe slurry outlet 12 during being pressed into foundation soil not be plugged, slurry outlet 12 is being distributed with Outer wall of steel pipe on package one circle strainer 11, can be selected spot welding strainer 11 is fixed in steel pipe walls;Blocking-proof result is preferably Polyethylene preservative film is wound in the outside of strainer 11, plastic adhesive tape is used in combination to be fastened every 100mm spacing.
Preferably, it is equipped with a shoe 9 in the bottom end of first segment steel pipe, which is that bottom surface radius is more than steel pipe radius The cone angle of inverted cone, the inverted cone is not more than 60 degree.The effect of shoe 9:A. protection steel pipe during piling, injected hole not by It destroys and blocks;B. the frictional resistance for reducing soil around pile during piling can make steel-pipe pile enter layer deeper;C. it is convenient for pressure After the completion of stake, slurries being capable of the smooth outflow from steel pipe.Preferably, the length of the first segment steel pipe (being free of shoe) be 1.0~ 1.5m, wall thickness 7mm, outer diameter are Φ 273mm.
Above-mentioned buildings or structures foundation stabilization underpins the construction method of pier, includes the following steps:
(1) according to 1 or more load of buildings or structures substrate and the bearing capacity for underpining pier 5, determine the quantity for underpining pier 5 and Position carries out unwrapping wire positioning to underpining pier 5, and adjacent 5 spacing of pier that underpins is between 1.8~2.0m.
(2) it in the corresponding position for underpining pier 5, is opened vertically at 10~20cm of outer edge apart from buildings or structures basis 1 Dig base tunnel, the planar dimension of the base tunnel is 1.2m × 1.0m~1.5m × 1.0m, the depth of base tunnel to buildings or structures basis bottom 1.5~2.0m below face;
(3) operation hole is excavated:Base tunnel is excavated in basic 1 bottom surface part below to the interior direction level on basis 1 Design requirement underpins 5 center position of pier, obtains the operation that height is 1.8~2.0m and cheats;
(4) vertically-mounted first segment steel pipe at 5 orientation axis of pier is underpined in operation hole and corrects vertical, the first segment steel Tube bottom end carries shoe;Using the basic above load in 1 bottom surface of building as counter-force, using pile compacting equipment (such as jack) by the steel pipe Push operation straight down is cheated in the foundation soil of bottom;For the ease of construction, it is 1.0~1.5m that length, which is pre-machined into, in steel pipe Multistage steel pipe;Remaining vertically-mounted steel pipe successively above first steel pipe, alternately by constantly piling, pile extension, Site welding is integral between steel pipe, until the length of the following steel-pipe pile of the building bottom of foundation 4 >=underpin pier design length+ 1000mm is to get to steel-pipe pile 4;
In order to increase the bottom end bearing capacity for underpining pier 5, while settlement of foundation is reduced, as shown in figure 3, in 4 lower end of steel-pipe pile Side wall on be evenly equipped with multiple slurry outlets 12, these slurry outlets 12 can make the cement grout into steel-pipe pile 4 directly penetrate into steel It is spread in the stratum at tube bottom end and along hole.Through experiment, in steel pipe walls within the scope of 500mm, arranged in steel pipe short transverse 5 layers of slurry outlet.Preferably, slurry outlet 12 is circle, and circle can equably be spread;Its preferred aperture is Φ 6, and pitch of holes is The distance of 50mm, upper layer and lower layer slurry outlet 12 are 100mm.
In addition, in order to make first segment steel pipe slurry outlet 12 during being pressed into foundation soil not be plugged, it is being distributed with out One circle strainer 11 of package on the outer wall of steel pipe in hole 12 is starched, spot welding can be selected, strainer 11 is fixed in steel pipe walls;Blocking-proof result is more Good is to wind polyethylene preservative film in the outside of strainer 11, and plastic adhesive tape is used in combination to be fastened every 100mm spacing.
Preferably, it is equipped with a shoe 9 in the bottom end of first segment steel pipe, which is that bottom surface radius is more than steel pipe radius The cone angle of inverted cone, the inverted cone is not more than 60 degree.The effect of shoe 9:A. protection steel pipe during piling, injected hole not by It destroys and blocks;B. the frictional resistance for reducing soil around pile during piling can make steel-pipe pile enter layer deeper;C. it is convenient for pressure After the completion of stake, slurries being capable of the smooth outflow from steel pipe.Preferably, the length of the first segment steel pipe (being free of shoe) be 1.0~ 1.5m, wall thickness 7mm, outer diameter are Φ 273mm.
(5) then removal pile compacting equipment fixes one block of stake top steel plate 10, stake top steel plate 10 at 4 upper end opening of steel-pipe pile Center is provided with circular hole 8.
(6) it uses underpinning device to carry out precompressed to steel-pipe pile 4 and underpins processing, to prevent generation rebound after 4 off-load of steel-pipe pile;
(7) one is fixed on stake top steel plate 10 and underpin steel pipe 2, underpin 2 upper ends steel plate 3 of steel pipe and building basis 1 Contact, guarantee underpins steel pipe 2 and steel-pipe pile 4 is coaxial;It is prefabricated with slip casting pipe fitting 7 on underpining 2 side wall of steel pipe, will pass through support It changes steel pipe 2 and grouting and reinforcing is carried out to the foundation soil 6 for underpining 5 bottom end of pier;
(8) axis centered on steel-pipe pile 4 excavates pier hole, aperture 1500mm, hole depth 6000 below the building bottom of foundation ~9000mm;
(9) placement layer by layer plain concrete and vibration compacting in pier hole are being underpined behind clear bottom, lift height is 250~ 300mm, it is concordant with 4 top of steel-pipe pile that plain concrete pours height;
(10) 3~5 days after the completion of pier shaft concreting, by underpining the filling adaptor 7 reserved on steel pipe to underpining pier The foundation soil 6 of bottom end carries out slip casing by pressure.Injecting paste material is striaght cement slurries, and the ratio of mud is 0.45~0.60, and grouting pressure is super Terminate slip casting when crossing 2.5MPa.
(11) pile crown position concrete is poured.Pile crown position uses microdilatancy plain concrete, strength grade of concrete not low In C30;
(12) back-filling in layers and tamping operation foundation pit, lift height are 250~300mm, and backfill material is 2:8 dirt or 3:7 Dirt individually underpins the construction of pier 5 and accuses completion.
(13) repeat the above steps (2)~(12), on the design position for underpining pier 5 along the span direction on building basis Repetition be arranged it is multiple underpin pier 5, entire engineering is accused and is completed.
Embodiment:
In order to illustrate the specific implementation process of the utility model and the validity of verification the utility model, inventor provides It constructs below embodiment.
Certain power plant's coal slime pump house Equipment Foundations is raft plate, and key dimension is 11000mm × 9000mm, thick 1000mm.Due to Substrate soil soaks, and causes raft foundation differential settlement, it is necessary to carry out consolidation process, compare through a variety of Scheme of Strengthening, determination is adopted Consolidation process is carried out to raft plate ground with pier foundation.
According to exploration report, geological conditions is followed successively by from top to bottom:1. miscellaneous fill, 0.6~1.0m of thickness, loosely;2. element It bankets, thickness about 0.8m is hard;3. silty clay, thickness about 0.4m is plastic;4. sand gravel layer, thickness 1.7m, loosely;5. powder Matter clay, thickness 1.1m, soft modeling;6. ancient soil, thickness 0.60m is hard;7. silty clay, thickness 2.9m is hard;8. gravel Rock layers, layer top buried depth is about 8.0m or so, this layer does not penetrate.Groundwater buried depth is deeper, can not consider its influence to basis.
It is required according to Design of Reinforcement:Arrange that 7 underpin pier altogether in the case where raft foundation settles larger side substrate, with 8. gravel Rock layers underpin pier diameter 1500mm, depth 9.0m, bearing capacity 800kN as supporting course, pier spacing 1850mm.To prevent from holding in the palm It changes pier construction period raft foundation and generates additional sinking, first construction steel pipe underpinned pile, then construction underpins pier.
Specific construction process is as follows:
(1) according to 1 or more load of basement bottom of the building and the bearing capacity for underpining pier 5, quantity and the position for underpining pier 5 are determined, Unwrapping wire positioning is carried out to underpining pier 5, the adjacent pier spacing that underpins is 1.85m;
(2) in the position for underpining pier 5, base tunnel is excavated at 10~20cm of outer edge apart from raft foundation 1 vertically, base tunnel Planar dimension is 1.2m × 1.0m, 2.0m below the depth to 1 bottom surface of raft foundation of base tunnel;
(3) operation hole is excavated:By base tunnel in 1 bottom surface of raft foundation part below to the interior direction water of raft foundation 1 It is flat be excavated to design requirement underpin 5 center position of pier, obtain the operation that height is 2.0m and cheat;
(4) steel-pipe pile that vertically-mounted first segment bottom end at 5 orientation axis of pier carries shoe, steel pipe are underpined in operation hole Stake 4 with to underpin pier 5 coaxial, steel-pipe pile is seamless steel pipe, model Φ 273mm, wall thickness 7mm.After correction is vertical, with raft foundation The above load in 1 bottom surface is counter-force, and steel pipe push operation straight down is cheated to the foundation soil of bottom using 500kN hydraulic jacks In.Several sections that length is 1.0~1.5m are pre-machined into steel pipe.Alternately by constantly piling, pile extension, until steel pipe Until when 4 length of stake are not less than 10m, connection is using along border welding between pile cutoff.
First segment steel pipe is the special steel pipe that bottom end is drilled with injected hole with shoe, side wall, and length is that 1.0m (is free of shoe Part), in steel pipe walls within the scope of 500mm, it is drilled with the slurry outlet that 5 round diameters are Φ 6 along steel pipe short transverse, pitch of holes is 50mm, array pitch 100mm.One circle strainer of winding package, is used in combination spot welding that strainer is fixed in steel pipe walls, is filtering on the outside of slurry outlet The outside of net winds 2 polyethylene preservative films, and plastic adhesive tape is used in combination to be fastened every 100mm spacing.
(5) removal pile compacting equipment, it is 250mm × 250mm that one piece of section is then fixed at steel-pipe pile upper end opening, thick Degree is the steel plate 10 of 20mm, and steel plate center is drilled with the circular hole of a diameter of Φ 50mm in advance.
(6) it uses underpinning device to carry out precompressed to steel-pipe pile 4 and underpins processing, to generate after preventing 4 off-load of steel pipe underpinned pile Rebound;
(7) an outer diameter Φ 159 is fixed on 4 stake top steel plate 10 of steel-pipe pile, wall thickness 6mm's underpins steel pipe 2, underpins steel pipe 2 One piece of section of upper ends is 200mm × 200mm, and thickness is the steel plate 3 of 20mm and is held out against with basic 1 bottom surface that guarantee underpins steel Pipe 2 and steel-pipe pile 4 are coaxial.The good slip casting pipe fitting 7 of pre-production on underpining 2 wall of steel pipe, will pass through steel pipe 2 to underpining pier 5 Bottom end foundation soil carries out slip casting;
(8) centered on steel-pipe pile 4, in 1 time excavation pier hole of substrate, aperture 1500mm, hole depth 9000mm;
(9) behind clear bottom, placement layer by layer plain concrete and vibration compacting, lift height 300mm, concrete pour in pier hole Stop pouring when building concordant to 4 pile crown position of steel-pipe pile, strength grade of concrete C30;
(10) 3 days after the completion of pier shaft concreting, foundation soil 6 is carried out by underpining the injected hole 7 reserved on steel pipe 2 Slip casing by pressure.Injecting paste material is striaght cement slurries, and the ratio of mud 0.50, cement is 42.5R grades of Portland cements, slip casting pressure Power terminates slip casting work when being more than 2.5MPa.
(11) pile crown position concrete is poured.Pile crown position is using microdilatancy plain concrete, strength grade of concrete C30;
(12) back-filling in layers tamping operation foundation pit, lift height 300mm, backfill material are 2:8 dirt individually underpin pier and apply Work is accused and is completed.
(13) repeat the above steps (2)~(12), and entire engineering is accused and completed.
Consolidation effect:This foundation stabilization, the construction of steel-pipe pile 4 use alternation excavation, through repeatedly observing construction period basis Maximum additional settlement is 0.5cm, and after the completion of underpining pier construction, building basis and superstructure settle unchanged, consolidation effect Well.

Claims (8)

1. a kind of building or structures foundation stabilization underpin pier, which is characterized in that including being mounted on building or structures base The multiple of beneath side underpin pier, and the pier that underpins is internally provided with coaxial steel-pipe pile;Consolidate at the steel-pipe pile upper end opening Open round-meshed stake top steel plate in fixed one piece of center;Be fixed on the stake top steel plate with steel-pipe pile it is coaxial underpin steel pipe, institute It states and underpins steel pipe upper end and contacted with basement bottom of the building;Slip casting pipe fitting is prefabricated on steel pipe side wall in described underpin;In the steel Multiple slurry outlets are evenly equipped on the side wall of pile pile lower end.
2. building as described in claim 1 or structures foundation stabilization underpin pier, which is characterized in that go out described in being distributed with Starch one circle strainer of package on the outer wall of the steel-pipe pile in hole.
3. building as claimed in claim 2 or structures foundation stabilization underpin pier, which is characterized in that in the outer of the strainer Side winds water permeable membrane.
4. building as described in claim 1 or structures foundation stabilization underpin pier, which is characterized in that in the bottom end of steel-pipe pile Equipped with a shoe, the shoe is the inverted cone that bottom surface radius is more than steel pipe radius.
5. building as described in claim 1 or structures foundation stabilization underpin pier, which is characterized in that in first segment steel pipe walls Within the scope of upper 500mm, the slurry outlet that is of five storeys is arranged in steel pipe short transverse.
6. building as described in claim 1 or structures foundation stabilization underpin pier, which is characterized in that the slurry outlet is circle Shape, aperture are Φ 6, and the distance of pitch of holes 50mm, upper layer and lower layer slurry outlet are 100mm.
7. building as described in claim 1 or structures foundation stabilization underpin pier, which is characterized in that in the steel-pipe pile Bottom end is equipped with a shoe, and the shoe is the inverted cone that bottom surface radius is more than steel pipe radius.
8. building as claimed in claim 7 or structures foundation stabilization underpin pier, which is characterized in that the cone of the inverted cone Angle is not more than 60 degree.
CN201721401390.9U 2017-10-27 2017-10-27 A kind of building or structures foundation stabilization underpin pier Active CN207659986U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107700521A (en) * 2017-10-27 2018-02-16 西安建筑科技大学 One kind is built(Structure)Build thing foundation stabilization and underpin pier and its construction method
CN114517489A (en) * 2022-01-18 2022-05-20 天津大学 Offshore wind power barrel type foundation structure with pile pier
CN114892734A (en) * 2022-03-30 2022-08-12 中国能源建设集团广东省电力设计研究院有限公司 Reinforcing structure and reinforcing construction method of concrete strip foundation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107700521A (en) * 2017-10-27 2018-02-16 西安建筑科技大学 One kind is built(Structure)Build thing foundation stabilization and underpin pier and its construction method
CN114517489A (en) * 2022-01-18 2022-05-20 天津大学 Offshore wind power barrel type foundation structure with pile pier
CN114892734A (en) * 2022-03-30 2022-08-12 中国能源建设集团广东省电力设计研究院有限公司 Reinforcing structure and reinforcing construction method of concrete strip foundation

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