CN105649089A - Construction method for excavating foundation pit close to existing shallow foundation protection structure - Google Patents
Construction method for excavating foundation pit close to existing shallow foundation protection structure Download PDFInfo
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- CN105649089A CN105649089A CN201610020482.6A CN201610020482A CN105649089A CN 105649089 A CN105649089 A CN 105649089A CN 201610020482 A CN201610020482 A CN 201610020482A CN 105649089 A CN105649089 A CN 105649089A
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- 238000010276 construction Methods 0.000 title claims abstract description 67
- 239000002689 soil Substances 0.000 claims abstract description 66
- 238000009412 basement excavation Methods 0.000 claims abstract description 48
- 238000004873 anchoring Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000011068 loading method Methods 0.000 claims description 22
- 230000002787 reinforcement Effects 0.000 claims description 17
- 239000004567 concrete Substances 0.000 claims description 10
- 230000011218 segmentation Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 239000011376 self-consolidating concrete Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 230000003204 osmotic effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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- General Engineering & Computer Science (AREA)
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- Piles And Underground Anchors (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a construction method for excavating a foundation pit close to an existing shallow foundation protection structure. The construction method is characterized by comprising the steps that firstly, during construction, a foundation strengthening and reinforcing body and a lateral deformation soldier pile are arranged on the lower portion of an existing building foundation and the side, close to the foundation pit, of the outside of the foundation correspondingly; secondly, a cemented soil curing waterstop belt is arranged between the building foundation and the lateral deformation soldier pile, and a counter-force cross beam is arranged on the upper portion of the cemented soil curing waterstop belt; thirdly, a prestress oblique anchoring body is arranged on the lower portion of the foundation in a hit mode, and prestressing force is applied; and finally, soil bodies on the lower portion and the outer side portion of the building foundation are taken out, and then a vertical deformation adjustment structure and a transverse deformation adjustment structure are installed. In the excavation process of the foundation pit, the vertical deformation and transverse deformation of a building are controlled dynamically in real time; a gap around the building foundation is backfilled after excavation of the foundation pit is completed, and an anchor rod recovery section is recovered. According to the construction method, the construction technique is simple, deformation of the building foundation can be dynamically controlled in the vertical direction and the lateral direction, and the safety performance of the building foundation can be improved.
Description
Technical field
The present invention relates to a kind of excavation of foundation pit and close on existing shallow foundation protection construction method, particularly a kind of capable of dynamic control building foundation laterally, vertical deformation, improve the construction method of existing shallow foundation stability of foundation, belong to building engineering field.
Background technology
Excavation Process is comparatively complicated, in digging process, be often attended by the engineering problems such as resistance to shear of soil release, underground water eliminating, Ground Settlement of Deep Foundation Pit distortion, these engineering problems all may cause the generation lateral deformation of foundation ditch neighboring buildings and vertical deformation, and then cause the safe condition of building constantly deteriorated, particularly outstanding on the impact of shallow foundation safe condition.
In Practical Project, close on the distortion of building for controlling foundation ditch, often get the initiatively pattern foundation pit supporting structure mode of protection, as vertical campshed is set, sets transversal reinforcement body, lays inner support etc. Though can improving stable state, the enhancing of foundation ditch to a great extent, these engineering measures close on the security of building, but because these measures mainly lay particular emphasis on the stability that maintains foundation pit side-wall, be difficult to fundamentally solve existing transversely deforming and the lateral deformation problem that building occurs in Excavation Process of closing on, cannot realize the dynamic control to existing building distortion.
Aspect existing building correction, existing potter's clay rectifying method, immersion rectifying method, precipitation rectifying method, pressing Ioad rectifying method, anchoring pile pressurization rectifying method etc., these building Deviation Correction methods mainly for the building that occurs obviously to tilt, high to soil rigidity and building integral rigidity requirement, be difficult to realize dynamic control to building Deviation Correction, do not consider the lifting of Carrying capacity.
In view of above-mentioned technical background; for preventing that existing building from destroying in Excavation Process; the existing building of closing on that effectively control excavation of foundation pit brings out is out of shape; improve the security of building, need at present a kind of excavation of foundation pit that can general protection existing building of invention badly and close on existing shallow foundation protection structure.
Summary of the invention
The object of the present invention is to provide one not only can improve the existing building safety state that closes on, and can close on existing shallow foundation protection construction method to building the excavation of foundation pit that contingent transversely deforming and vertical deformation carry out dynamically controlling in Excavation Process.
In order to realize above-mentioned technical purpose, the present invention has adopted following technical scheme:
1, excavation of foundation pit closes on an existing shallow foundation protection construction method, mainly comprises following construction procedure:
1) preparation of construction: carry out key dimension test, lay deformation observation point, carry out component and fitting quality examination, organizing construction's machinery, personnel march into the arena;
2) lateral deformation soldier pile construction: between outside, existing building basis and excavation of foundation pit face, carry out cement mixing pile or rotary churning pile or digging hole filling pile construction, form lateral deformation soldier pile;
3) foundation reinforcement reinforcing body construction: according to designing requirement, segment section draws hole and fetches earth under the existing building basis of closing on, and in foundation soil, cement solidification soil or mini pile or chemosetting soil is set, and forms foundation reinforcement reinforcing body; In the time adopting mini pile as foundation reinforcement reinforcing body, also the mini pile top soil body should be solidified;
4) soil cement is set and solidifies the band that intercepts water: adopt hole mud jacking or high pressure jet grouting or the osmotic grouting mode of drawing, between lateral deformation soldier pile and building foundation, construction forms soil cement and solidifies the band that intercepts water, soil cement solidifies the band that intercepts water and is vertically banded, and its vertical degree of depth is not less than the layer end degree of depth in foundation soil water-bearing layer;
5) armored concrete counter-force crossbeam is set: after the curing belt construction that intercepts water of soil cement completes, solidify at soil cement the band top of intercepting water at once and install template, and casting concrete formation armored concrete counter-force crossbeam, in counter-force crossbeam, longitudinally default oblique anchoring body passes hole;
6) set oblique anchoring body: oblique anchoring body default in self-reaction force crossbeam sets oblique anchoring body through hole in the soil body of basic bottom, anchor hole is drilled with in process and first the anterior anchored end of free segment and free segment rear portion anchored end is carried out to reaming processing, carrying out hole clearly processes again, then anchor recovering section is connected by connecting bolt with anchor pole indwelling section, in the anterior anchored end of the free segment of anchor pole indwelling section and free segment rear portion anchored end, directed ground tackle and intermediate plate is set; Anchor pole is inserted into after projected depth, to slip casting in anchor hole;
7) basic bottom, outside soil body segmentation are excavated: adopt artificial or small-sized construction machinery that the soil body of existing building bottom, basis and outside certain limit is moved towards to segmentation along basis and draw out, the soil body inserts vertical supporting body at once after drawing out, control the disturbance of construction to the periphery soil body;
8) vertical deformation adjustment structure is installed: vertical deformation adjustment structure is made up of top raising plate, bottom loading plate, vertical jack, vertical buttress, vertical pressure diffuser plate; Top raising plate and loading plate cross section, bottom are all " ﹂ " shape; When construction, in the preset clearance between existing building basis and foundation reinforcement reinforcing body, longitudinally segmentation is symmetrical inserts " ﹂ " shape top raising plate and bottom loading plate, and at desired location, vertical jack is installed; After vertical jack jacking, insert vertical buttress;
9) laterally connector is installed: laterally connector comprises cross-brace post and connector loading plate; When construction, towards basic side, connector loading plate and cross-brace post are set at counter-force crossbeam, connector loading plate and cross-brace post are by being welded to connect;
10) transversely deforming adjustment structure is set: transversely deforming adjustment structure comprises horizontal counter-force jack, horizontal buttress, cross-brace plate, transverse pressure diffuser plate; When construction, longitudinally lay cross-brace plate and horizontal counter-force jack in outside, basis, horizontal counter-force jack one end is contacted with the vertical side walls of " ﹂ " shape top raising plate, the other end contacts with cross-brace plate;
11) oblique anchoring body prestress application: by tensioning equipment, oblique anchoring body is applied to prestressing force, and oblique anchoring body is first anchored on counter-force crossbeam;
12) excavation of foundation pit: complete and form after intensity until oblique anchor construction, set foundation pit supporting pile, the soil body in excavation pit, foundation pit supporting pile and lateral deformation soldier pile be arranged in parallel;
13) deformation observation: in Excavation Process at any time observation building laterally, the pressure condition of vertical deformation, oblique anchoring body stress, vertical deformation adjustment structure and transversely deforming adjustment structure, by adjusting the overhang of vertical jack and horizontal counter-force jack, control building distortion;
14) grouting behind shaft or drift lining obturator construction: until excavation of foundation pit complete, outside foundation ditch soil deformation stable after, take out the vertical jack of vertical deformation adjustment structure and the horizontal counter-force jack of transversely deforming adjustment structure along building foundation longitudinal separation, in building foundation periphery space, build self-compacting concrete again, form grouting behind shaft or drift lining obturator;
15) anchor recovering: unclamp the connecting bolt of oblique anchoring body, anchor recovering section and the anterior anchored end of free segment are disconnected, subsequently anchor recovering section is extracted, and fill hole.
Oblique anchoring body adopts prestressed anchor, the anterior anchored end of free segment and free segment rear portion anchored end are set respectively at the two ends of free segment, between anchor recovering section and the anterior anchored end of free segment, establish connecting bolt, in the anterior anchored end of free segment, establish ground tackle and intermediate plate, after having constructed, free segment anchor pole is regained.
In Excavation Process, adopt vertical deformation adjustment structure and transversely deforming adjustment structure, control respectively Vertical Settlement and the transversely deforming of building, realize the two-way dynamic control to building distortion in Excavation Process.
In the time carrying out vertical deformation adjustment structure and transversely deforming adjustment structure deformation adjustment, first adopt ultra-thin jack synchronously to carry out building foundation vertically, laterally adjust, and monitoring building deformation, then insert vertical buttress or laterally buttress carrying in gap.
In Excavation Process, the force value of the prestress value of the oblique anchoring body of Simultaneous Monitoring, vertical deformation adjustment structure and transversely deforming adjustment structure, and building foundation deformation, adjust building distortion in real time according to Monitoring Result.
The present invention has following feature and beneficial effect:
(1) before excavation of foundation pit, be first provided with foundation reinforcement reinforcing body, soil cement curing intercept water band, lateral deformation soldier pile, can effectively promote bearing capacity and the security of building foundation, building foundation bottom, house soil body generation seepage failure.
(2) to foundation ditch side, vertical deformation adjustment structure and transversely deforming adjustment structure are set respectively in basic bottom and edge surface, can, from the distortion of vertical and horizontal both direction control building foundation, prevent from building the disease such as run-off the straight, sedimentation.
(3) adopt prestressing force recoverable anchor rod oblique anchoring body, free segment, anterior anchored end and free segment rear portion anchored end be set in foundation soil, both can apply prestressing force to the soil body outside building foundation, again can be after construction completes recovery section anchor pole.
(4) vertical jack, laterally jack, the recoverable utilization after Practical Completion of anchor recovering section, save construction material.
Brief description of the drawings
A kind of excavation of foundation pit of Fig. 1 the present invention closes on existing shallow foundation protection structure schematic cross-sectional view
Fig. 2 is structure schematic cross-sectional view after Fig. 1 excavation of foundation pit completes;
Fig. 3 is schematic diagram after Fig. 1 vertical deformation adjustment structure and transversely deforming adjustment structure are installed;
Fig. 4 is the oblique anchoring body structural profile of Fig. 1 schematic diagram;
Fig. 5 is that excavation of foundation pit of the present invention closes on existing shallow foundation protection structural key operation construction process figure.
In figure: 1-foundation reinforcement reinforcing body, 2-soil cement solidifies the band that intercepts water, 3-lateral deformation soldier pile, 4-vertical deformation adjustment structure, 5-transversely deforming adjustment structure, 6-laterally connector, 7-counter-force crossbeam, 8-oblique anchoring body, 9-building foundation, 10-building lot soil, 11-top raising plate, 12-bottom loading plate, 13-vertical jack, 14-vertical buttress, 15-vertical pressure diffuser plate, 16-laterally counter-force jack, 17-laterally buttress, 18-cross-brace plate, 19-transverse pressure diffuser plate, 20-cross-brace post, 21-connector loading plate, 22-anchor recovering section, the anterior anchored end of 23-free segment, 24-free segment rear portion anchored end, 25-anchor pole indwelling section, 26-connecting bolt, 27-directed ground tackle, 28-intermediate plate, 29-bolt grouting body, 30-foundation pit supporting pile, 31-grouting behind shaft or drift lining obturator, 32-building.
Detailed description of the invention
Below in conjunction with brief description of the drawings, inventive embodiment is described in further detail, but the present embodiment is not limited to the present invention, every employing similar construction method of the present invention and similar variation thereof, all should list the protection domain of invention in.
Soil cement solidifies design and construction technical requirement, Plate Welding construction technical requirement, jack jack-up construction technical requirement, the design and construction technical requirement of foundation pit supporting pile etc. of design and construction technical requirement, the foundation reinforcement reinforcing body of design and construction technical requirement, the lateral deformation soldier pile of the band that intercepts water, in present embodiment, repeat no more, emphasis is set forth the embodiment that the present invention relates to.
A kind of excavation of foundation pit of Fig. 1 the present invention closes on existing shallow foundation protection structure schematic cross-sectional view; Fig. 2 is structure schematic cross-sectional view after Fig. 1 excavation of foundation pit completes; Fig. 3 is schematic diagram after Fig. 1 vertical deformation adjustment structure and transversely deforming adjustment structure are installed; Fig. 4 is the oblique anchoring body structural profile of Fig. 1 schematic diagram, and Fig. 5 is that a kind of excavation of foundation pit of the present invention closes on existing shallow foundation protection structural key operation construction process figure. Shown in Fig. 1, when structure construction, first excavate side at 9 bottoms, existing building basis, basic outside closing foundation ditch foundation reinforcement reinforcing body 1, lateral deformation soldier pile 3 are set respectively; Curing the intercepting water of soil cement is set between building foundation 9 and lateral deformation soldier pile 3 again and is with 2, soil cement solidifies to intercept water is with 2 tops to establish counter-force crossbeam 7; With setting the oblique anchoring body 8 of prestressing force and apply prestressing force in the backward building foundation 9 bottom soil bodys; Finally building foundation 9 bottoms and outside soil body segmentation are excavated, then vertical deformation adjustment structure 4 and transversely deforming adjustment structure 5 are installed; In Excavation Process, dynamically control in real time vertical deformation and the transversely deforming amount of building 32; The space of backfill building foundation 9 peripheries after excavation of foundation pit completes, reclaims anchor recovering section 22.
Building foundation 9 is bar shaped stone-laying basis, embedded depth of foundation 0.5m, basic wide 0.6m; Building lot soil 10 is sandy soil; It is the cement mixing pile of 1.0m that foundation pit supporting pile 30 adopts diameter, and stake is long is 8m; Building 32 is the 6 layers of brick-and-concrete buildings in ground.
This excavation of foundation pit closes on existing shallow foundation protection construction method, mainly comprises following construction procedure:
1) preparation of construction: carry out key dimension test, lay deformation observation point, carry out component and fitting quality examination, organizing construction's machinery, personnel march into the arena;
2) lateral deformation soldier pile 3 is constructed: between existing building 9 outsides, basis and excavation of foundation pit face, carry out lateral deformation soldier pile 3 and construct; Lateral deformation soldier pile 3 adopts cement mixing pile, pile body diameter 0.5m, and pile spacing 0.6m, the long 4m of stake, top embeds counter-force crossbeam 7 interior 0.2m;
3) foundation reinforcement reinforcing body 1 is constructed: according to designing requirement, draw hole fetch earth at the 9 times segment sections in existing building basis that close on, and to cement injection in foundation soil, form foundation reinforcement reinforcing body 1; Foundation reinforcement reinforcing body 1 adopts the oblique hole grouting mode of drawing to form cement solidification soil, reinforcing scope in the downward 2m depth bounds of the bottom of foundation, plane width 2m.
4) curing the intercepting water of soil cement is set and is with 2: curing the intercepting water of soil cement is set between lateral deformation soldier pile 3 and building foundation 9 and is with 2, soil cement solidifies to intercept water is with 2 to be banded laying, its vertical degree of depth 8m, the curtain of the wide 50cm of Pressure Revolving Blast-Grout construction formation is drawn in employing, and cement adopts Portland cement.
5) armored concrete counter-force crossbeam 7 is set: after soil cement solidifies and intercepts water and be with 2 constructions to complete, solidify to intercept water at soil cement at once and be with 2 tops to install template, and casting concrete forms armored concrete counter-force crossbeam 7; Counter-force crossbeam 7 adopts reinforced concrete structure, deck-siding 0.8m, high 0.5m, the oblique anchoring body 8 that preset diameters is 130mm in beam through hole.
6) set oblique anchoring body 8: oblique anchoring body 8 adopts prestressed anchor; When construction, the interior default oblique anchoring body 8 of self-reaction force crossbeam 7 sets oblique anchoring body 8 through hole in the soil body of basic bottom, anchor hole is drilled with in process the anterior anchored end 23 of free segment and free segment rear portion anchored end 24 is carried out to reaming processing, and the anterior anchored end 23 of free segment and free segment rear portion anchored end 24 long 2m, diameter are 150mm; Behind clear hole, anchor recovering section 22 is connected by connecting bolt 26 with anchor pole indwelling section 25, at the anterior anchored end 23 of free segment and interior directed ground tackle 27 and the intermediate plate 28 of arranging of free segment rear portion anchored end 24 of anchor pole indwelling section 25; Anchor pole is inserted into after projected depth, to slip casting in anchor hole; Between anchor recovering section and the anterior anchored end 23 of free segment, establish connecting bolt; The long 6m of anchor recovering section 22, anchor pole indwelling section 25 long 10m, all adopt the screw-thread steel of diameter 32mm, anchor hole diameter 130mm; Bolt grouting body 29 adopts cement mortar.
7) basic bottom, outside soil body segmentation are excavated: adopt artificial or small-sized construction machinery that the soil body of existing building 9 bottoms, basis and outside certain limit is moved towards to segmentation along basis and draw out, the soil body inserts vertical supporting body at once after drawing out, control the disturbance of construction to the periphery soil body;
8) vertical deformation adjustment structure 4 is installed: vertical deformation adjustment structure 4 is made up of top raising plate 11, bottom loading plate 12, vertical jack 13, vertical buttress 14, vertical pressure diffuser plate 15; Top raising plate 11 and bottom loading plate 12 cross sections are all " ﹂ " shape, adopt prefabricated the forming of Q345B steel plate of thick 10mm, the wide 50cm of its middle and upper part raising plate 11, high 50cm, the wide 50cm of bottom loading plate 12, high 10cm; In the symmetrical preset clearance inserting between existing building basis 9 and foundation reinforcement reinforcing body 1 of top raising plate 11 and bottom loading plate 12; Vertical jack 13 models are YZB10-60, its tonnage 10T, stretching, extension height 170mm, stroke 60mm; Vertical buttress 14 adopts the Q345B Plate Welding of thick 10mm to be " work " font, outline height 10cm-17cm, the wide 20cm in the edge of a wing; Vertical pressure diffuser plate 15 adopts prefabricated the forming of Q345B steel plate of thick 5mm, long 20cm, wide 20cm; After vertical jack 13 jackings, insert again vertical buttress 14.
9) laterally connector 6 is installed: laterally connector comprises cross-brace post 20 and connector loading plate 21; Cross-brace post 20 adopts the steel I-column of diameter 20cm, high 50cm, and connector loading plate 21 adopts prefabricated the forming of Q345B steel plate of thick 5mm, long 40cm, wide 40cm; Towards building foundation 9 sides, connector loading plate 21 and cross-brace post 20 are set at counter-force crossbeam 7, connector loading plate 21 and cross-brace post 20 are by being welded to connect;
10) transversely deforming adjustment structure 5 is set: transversely deforming adjustment structure 5 comprises horizontal counter-force jack 16, horizontal buttress 17, cross-brace plate 18, transverse pressure diffuser plate 19. Wherein laterally the gauge size of counter-force jack 16 is identical with vertical jack 13, and laterally the geomery of buttress 17 is identical with vertical buttress 14, and the geomery of transverse pressure diffuser plate 19 is identical with vertical pressure diffuser plate 15. When construction, longitudinally lay cross-brace plate 18 and horizontal counter-force jack 16 in outside, basis, one end of horizontal counter-force jack 16 is contacted with the vertical side walls of " ﹂ " shape top raising plate 11, the other end contacts with cross-brace plate 18.
11) oblique anchoring body 8 prestress applications: apply prestressing force by tensioning equipment to oblique anchoring body 8, and oblique anchoring body 8 is first anchored on counter-force crossbeam 7.
12) excavation of foundation pit: after structure coagulation forms intensity, set foundation pit supporting pile 30, the soil body in excavation pit; Foundation pit supporting pile 30 adopts cement mixing pile, and stake footpath is 0.6m, the long 10m of stake, and pile spacing 0.6m, be arranged in parallel with lateral deformation soldier pile 3.
13) deformation observation: in Excavation Process, observe at any time building 32 laterally, the pressure condition of vertical deformation, oblique anchoring body 8 stress, vertical deformation adjustment structure 4 and transversely deforming adjustment structure 5, by adjusting the overhang of vertical jack 13 and horizontal counter-force jack 16, control building distortion.
14) grouting behind shaft or drift lining obturator 31 is constructed: until excavation of foundation pit complete, outside foundation ditch soil deformation stable after, first take out the vertical jack 13 of vertical deformation adjustment structure 4 and the horizontal counter-force jack 16 of transversely deforming adjustment structure 5 along building foundation 9 longitudinal separations, in building foundation 9 periphery spaces, build self-compacting concrete again, form grouting behind shaft or drift lining obturator 31; Self-compacting concrete adopts self-compaction cement mortar material, and cement adopts P.O32.5 level Portland cement, maximum aggregate size 20mm;
15) anchor recovering: unclamp the connecting bolt 26 of oblique anchoring body 8, anterior to anchor recovering section 22 and free segment anchored end 23 is disconnected, subsequently anchor recovering section 22 is extracted, and fill hole.
In the time carrying out vertical deformation adjustment structure and transversely deforming adjustment structure deformation adjustment, first adopt ultra-thin jack synchronously to carry out building foundation vertically, laterally adjust, and monitoring building deformation, then to insert in gap vertical buttress 14 or laterally buttress 18 carry.
Claims (5)
1. excavation of foundation pit closes on an existing shallow foundation protection construction method, mainly comprises following construction procedure:
1) preparation of construction: carry out key dimension test, lay deformation observation point, carry out component and fitting quality examination, organizing construction's machinery, personnel march into the arena;
2) lateral deformation soldier pile construction: between outside, existing building basis and excavation of foundation pit face, carry out cement mixing pile or rotary churning pile or digging hole filling pile construction, form lateral deformation soldier pile;
3) foundation reinforcement reinforcing body construction: according to designing requirement, segment section draws hole and fetches earth under the existing building basis of closing on, and in foundation soil, cement solidification soil or mini pile or chemosetting soil is set, and forms foundation reinforcement reinforcing body; In the time adopting mini pile as foundation reinforcement reinforcing body, also the mini pile top soil body should be solidified;
4) soil cement is set and solidifies the band that intercepts water: adopt hole mud jacking or high pressure jet grouting or the osmotic grouting mode of drawing, between lateral deformation soldier pile and building foundation, construction forms soil cement and solidifies the band that intercepts water, soil cement solidifies the band that intercepts water and is vertically banded, and its vertical degree of depth is not less than the layer end degree of depth in foundation soil water-bearing layer;
5) armored concrete counter-force crossbeam is set: after the curing belt construction that intercepts water of soil cement completes, solidify at soil cement the band top of intercepting water at once and install template, and casting concrete formation armored concrete counter-force crossbeam, in counter-force crossbeam, longitudinally default oblique anchoring body passes hole;
6) set oblique anchoring body: oblique anchoring body default in self-reaction force crossbeam sets oblique anchoring body through hole in the soil body of basic bottom, anchor hole is drilled with in process and first the anterior anchored end of free segment and free segment rear portion anchored end is carried out to reaming processing, carrying out hole clearly processes again, then anchor recovering section is connected by connecting bolt with anchor pole indwelling section, in the anterior anchored end of the free segment of anchor pole indwelling section and free segment rear portion anchored end, directed ground tackle and intermediate plate is set; Anchor pole is inserted into after projected depth, to slip casting in anchor hole;
7) basic bottom, outside soil body segmentation are excavated: adopt artificial or small-sized construction machinery that the soil body of existing building bottom, basis and outside certain limit is moved towards to segmentation along basis and draw out, the soil body inserts vertical supporting body at once after drawing out, control the disturbance of construction to the periphery soil body;
8) vertical deformation adjustment structure is installed: vertical deformation adjustment structure is made up of top raising plate, bottom loading plate, vertical jack, vertical buttress, vertical pressure diffuser plate; Top raising plate and loading plate cross section, bottom are all " ﹂ " shape; When construction, in the preset clearance between existing building basis and foundation reinforcement reinforcing body, longitudinally segmentation is symmetrical inserts " ﹂ " shape top raising plate and bottom loading plate, and at desired location, vertical jack is installed; After vertical jack jacking, insert vertical buttress;
9) laterally connector is installed: laterally connector comprises cross-brace post and connector loading plate; When construction, towards basic side, connector loading plate and cross-brace post are set at counter-force crossbeam, connector loading plate and cross-brace post are by being welded to connect;
10) transversely deforming adjustment structure is set: transversely deforming adjustment structure comprises horizontal counter-force jack, horizontal buttress, cross-brace plate, transverse pressure diffuser plate; When construction, longitudinally lay cross-brace plate and horizontal counter-force jack in outside, basis, horizontal counter-force jack one end is contacted with the vertical side walls of " ﹂ " shape top raising plate, the other end contacts with cross-brace plate;
11) oblique anchoring body prestress application: by tensioning equipment, oblique anchoring body is applied to prestressing force, and oblique anchoring body is first anchored on counter-force crossbeam;
12) excavation of foundation pit: complete and form after intensity until oblique anchor construction, set foundation pit supporting pile, the soil body in excavation pit, foundation pit supporting pile and lateral deformation soldier pile be arranged in parallel;
13) deformation observation: in Excavation Process at any time observation building laterally, the pressure condition of vertical deformation, oblique anchoring body stress, vertical deformation adjustment structure and transversely deforming adjustment structure, by adjusting the overhang of vertical jack and horizontal counter-force jack, control building distortion;
14) grouting behind shaft or drift lining obturator construction: until excavation of foundation pit complete, outside foundation ditch soil deformation stable after, take out the vertical jack of vertical deformation adjustment structure and the horizontal counter-force jack of transversely deforming adjustment structure along building foundation longitudinal separation, in building foundation periphery space, build self-compacting concrete again, form grouting behind shaft or drift lining obturator;
15) anchor recovering: unclamp the connecting bolt of oblique anchoring body, anchor recovering section and the anterior anchored end of free segment are disconnected, subsequently anchor recovering section is extracted, and fill hole.
2. a kind of excavation of foundation pit according to claim 1 closes on existing shallow foundation protection construction method; it is characterized in that oblique anchoring body adopts prestressed anchor; the anterior anchored end of free segment and free segment rear portion anchored end are set respectively at the two ends of free segment; between anchor recovering section and the anterior anchored end of free segment, establish connecting bolt; in the anterior anchored end of free segment, establish ground tackle and intermediate plate, after having constructed, free segment anchor pole is regained.
3. a kind of excavation of foundation pit according to claim 1 closes on existing shallow foundation protection construction method; it is characterized in that in Excavation Process; adopt vertical deformation adjustment structure and transversely deforming adjustment structure; control respectively Vertical Settlement and the transversely deforming of building, realized the two-way dynamic control to building distortion in Excavation Process.
4. a kind of excavation of foundation pit according to claim 1 closes on existing shallow foundation protection construction method; it is characterized in that in the time carrying out vertical deformation adjustment structure and transversely deforming adjustment structure deformation adjustment; first adopt ultra-thin jack synchronously carry out building foundation vertically, laterally adjust; and monitoring building deformation, then insert vertical buttress or laterally buttress carrying in gap.
5. a kind of excavation of foundation pit according to claim 1 closes on existing shallow foundation protection construction method; it is characterized in that in Excavation Process; the force value of prestress value, vertical deformation adjustment structure and the transversely deforming adjustment structure of the oblique anchoring body of Simultaneous Monitoring; and building foundation deformation, adjust in real time building distortion according to Monitoring Result.
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| CN107059940A (en) * | 2017-01-25 | 2017-08-18 | 上海二十冶建设有限公司 | Close on the guard method of deep basal pit existing building shallow foundation |
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| CN111549784A (en) * | 2020-05-26 | 2020-08-18 | 武汉金涛岩土工程有限公司 | Construction process of foundation pit adjacent to building |
| CN112627249A (en) * | 2020-12-07 | 2021-04-09 | 马鞍山钢铁建设集团有限公司 | Construction method for shallow foundation reinforcement |
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| CN115467366A (en) * | 2022-08-17 | 2022-12-13 | 湖北工业大学 | A Construction Method for Actively Compensating the Deformation of Adjacent Operating Tunnels in Foundation Pit Construction |
| CN115467366B (en) * | 2022-08-17 | 2024-05-31 | 湖北工业大学 | Construction method for actively compensating deformation of adjacent operation tunnel in foundation pit construction |
| CN115710943A (en) * | 2022-11-11 | 2023-02-24 | 南京东大鸿基结构设计事务所有限公司 | Building deviation correcting device and method without damaging original building |
| CN119777395A (en) * | 2025-03-13 | 2025-04-08 | 北京城建道桥建设集团有限公司 | Deep and large foundation pit support system and construction method over existing subway section structure |
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