CN106013172B - Double-row pile combines Deep Foundation Pit Support for Soft Soil structure and construction method with diagonal brace - Google Patents
Double-row pile combines Deep Foundation Pit Support for Soft Soil structure and construction method with diagonal brace Download PDFInfo
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- CN106013172B CN106013172B CN201610516496.7A CN201610516496A CN106013172B CN 106013172 B CN106013172 B CN 106013172B CN 201610516496 A CN201610516496 A CN 201610516496A CN 106013172 B CN106013172 B CN 106013172B
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to a kind of double-row pile to combine Deep Foundation Pit Support for Soft Soil structure with diagonal brace, campshed and outer campshed in being set on the outside of foundation ditch, connecting plate, top curing area, stake top coupling beam, vertical water-seal pile are set between interior campshed and outer campshed, vertical water-stop sheet is inserted in vertical water-seal pile；Prime cement solid soil layer in hole is set in inner side of the bottom of foundation ditch along interior campshed；Diagonal brace is set between interior campshed and Base isolation system, vertical steel lattice column is set in diagonal brace span centre；Diagonal brace sets bottom support pier with Base isolation system joint, sets waist rail with interior campshed joint；In Base isolation system anti-float anchor rod arranged below and agent structure stake.The present invention can not only lift foundation pit enclosure structure stability, and can reduce hole bottom resilience amount, be also prevented from foundation ditch and seepage failure occurs.The present invention also disclosed above-mentioned double-row pile and Deep Foundation Pit Support for Soft Soil construction method combined with diagonal brace.
Description
Technical field
The present invention relates to it is a kind of can effectively be lifted pattern foundation pit supporting structure intensity, dynamic control Supporting Structure deformation double-row pile with tiltedly
Support combination Deep Foundation Pit Support for Soft Soil construction method, belongs to underground engineering field, suitable for soft clay area, Deep Foundation Pit Supporting Project.
Background technology
With the quickening of Urbanization in China speed, exploitation and utilization of the people to the underground space are increasingly extensive, building
Base pit engineering is presented the features such as " big, deep, tight, near ", it is various it is new go along with sb. to guard him form, construction technology continues to bring out.For big face
Long-pending deep-foundation pit engineering, traditional pile-anchor retaining form can be restricted on construction space, especially limited on construction ground
In the case of, the normal difficulty of transversal reinforcement body is set, and base pit stability relies primarily on the shearing strength and resistance to capsizing of support pile.
A kind of existing big foundation ditch diagonal brace structure, it includes diagonal brace rod member, diagonal brace counterforce device, support pile end right angle support
Disk, screw bolt and nut, it is characterised in that：The diagonal brace rod member is connected with diagonal brace counterforce device by bolted splice, the diagonal brace
Counterforce device by static pressure enter foundation pit earth in, the diagonal brace rod member with support pile end right angle pallet by being articulated and connected, supporting
Stake end right angle pallet is connected with rectangle support pile end.Though the structure is static pressure using diagonal brace structure, diagonal brace counterforce device
In burying, quality control on construction difficulty is larger；Structure is difficult to water on the outside of effective prevention and control foundation ditch and penetrated into.
It is a kind of with diagonal brace and the combined type foundation pit supporting construction for drawing anchor, be provided with enclosure wall in foundation pit supporting construction, enclose
A diagonal brace, diagonal brace lower end connects bearing are provided with the top of revetment, bearing is located at bottom of foundation ditch, and is provided with and tiltedly throws support for offsetting
The stiffening pile of active force.The structure contributes to the comprehensive diagonal brace that employs with drawing anchor to lift the stability of foundation pit supporting construction, but
Structure is difficult to overcome extraneous water to penetrate into, while fails to carry out reinforcement to diagonal brace bottom.
In summary, though existing foundation pit supporting construction can obtain good supporting effect under suitable operating mode, effective
Water infiltration, dynamic control diagonal brace support strength, rationalization's construction etc. remain certain deficiency on the outside of prevention and control foundation ditch.In view of
This, based on being actually needed for current engineering, urgently invents a kind of stabilization that foundation pit enclosure structure can not only be substantially improved at present
Property, and can reduce hole bottom resilience, be also prevented from foundation ditch negative and positive angular position occur seepage failure double-row pile with
Diagonal brace combines Deep Foundation Pit Support for Soft Soil construction method.
The content of the invention
The deformation of control foundation pit supporting construction can be played simultaneously it is an object of the invention to provide one kind, reduce construction organization hardly possible
The double-row pile of degree combines Deep Foundation Pit Support for Soft Soil construction method with diagonal brace.
To achieve the above object, present invention employs following technical scheme：
This double-row pile combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, set on the outside of the foundation ditch in campshed and outer campshed,
Connecting plate, top curing area, stake top coupling beam and vertical water-seal pile, vertical water-seal pile interpolation are set between interior campshed and outer campshed
Enter vertical water-stop sheet；Prime cement solid soil layer in hole is set in inner side of the bottom of foundation ditch along interior campshed；Between interior campshed and Base isolation system
Diagonal brace is set, vertical steel lattice column is set in diagonal brace span centre；Diagonal brace and Base isolation system joint set bottom support pier, diagonal brace with
Interior campshed joint sets waist rail；In Base isolation system anti-float anchor rod arranged below and agent structure stake.
As preferred：The bottom support pier upper surface is vertical with diagonal brace, and lays bottom bearing plate, in bottom support pier
Connection dowel is set between Base isolation system.
As preferred：The agent structure stake uses digging hole filling pile；Vertical water-seal pile uses cement mixing pile.
As preferred：Described interior campshed and outer campshed use pile for prestressed pipe, and it is spacing vertically to lay template along interior campshed
Plate connecting hoop plate and connecting plate spacing ring；The template limiting plate connecting hoop plate is fastenedly connected with interior campshed, and the template is spacing
Plate connecting hoop plate is welded to connect with template limiting plate；Connecting plate spacing ring is laid from interior campshed and outer campshed top down, connection
Plate spacing ring circumferentially sets a connecting plate stopper slot；In two corresponding connecting plate stopper slots of interior campshed and outer campshed
Insert connecting plate.
As preferred：Top curing area height original place 2-3m downwards from the outside of foundation ditch.
As preferred：The waist rail cross section is in a rectangular trapezoid, using reinforced concrete structure, in waist rail and interior campshed phase
Upper and lower part at friendship is respectively provided with template limiting plate；Shear force wall reinforcing steel bar is reserved on waist rail and connects steel with shear wall through hole
Muscle.
As preferred：The diagonal brace uses steel pipe or shaped steel, diagonal brace both ends set diagonal brace bearing plate, diagonal brace bearing plate with
Diagonal brace is at right angles welded to connect；Bottom diagonal brace bearing plate contacts with pressure jack and pressure pier surface；The stress on diagonal brace surface
Test sensor is welded to connect or pasted connection with diagonal brace.
As preferred：Hinged-support and pressure diffusion plate are set at the top of the steel lattice column, set among the steel lattice column
Length adjusting screws, the steel lattice column bottom are connected with agent structure stake top portion.
As preferred：The water-stop sheet pastes the steel plate of geomembrane or sheet rubber using side wall；It is provided with and cuts on the outside of interior campshed
Power wall, sets water barrier between shear wall and interior campshed, the water barrier uses geomembrane or sheet rubber, water barrier and interior campshed
And Base isolation system pastes connection.
This double-row pile combines Deep Foundation Pit Support for Soft Soil construction method, including following construction procedure with diagonal brace：
1), field surveys：Required according to site operation, engineering site carry out engineering mapping, find out engineering geology soil nature,
Level of ground water, foundation ditch and the existing distance for closing on building, and campshed, outer campshed, the stake position of agent structure stake in mark at the scene；
2), interior campshed and the construction of outer campshed：It is spacing that template limiting plate connecting hoop plate, connecting plate are inserted on the outside of interior campshed
Ring, connecting plate spacing ring is inserted on the outside of outer campshed, then sets pile for prestressed pipe straight down, campshed and outer campshed in formation,
And ensure two connecting plate stopper slots to being located along the same line；
3), vertical sealing pile driving construction：Between interior campshed and outer campshed, cement mixing is set under close interior campshed is lateral
Stake, and before vertical water-seal pile concrete initial set, vertically water-seal pile axis insertion water-stop sheet, makes water-stop sheet top mark height in even
Fishplate bar bottom absolute altitude；
4), connecting plate is constructed：Connecting plate is lifted to interior campshed and outer campshed, makes the insertion connection of the side of connecting plate two
In the connecting plate stopper slot of plate spacing ring；
5), top curing area is constructed：Before vertical sealing pile concrete final set, the soil body between internal campshed and outer campshed
Pressure injection hardening slurry, form top curing area；
6), foundation ditch internal upper part soil excavation：After construction supporting structure forms intensity, 1/3~1/2 is high in excavation pit
The soil body in the range of degree, then platform slope outwards is taken to bottom of foundation ditch absolute altitude along among foundation ditch；
7), mid-section body structure and agent structure pile driving construction：Agent structure pile driving construction is carried out according to design stake position, in main body
Structure pile top sets Base isolation system and main structural frame post, and sets hole prime cement to consolidate in inner side of the bottom of foundation ditch along interior campshed
Soil layer；
8), diagonal brace bottom support pier is constructed：Laid and required according to diagonal brace, bottom support pier is laid in hole bottom setting position；
9), waist rail is constructed：Template limiting plate is set in the inner side setting position of interior campshed, and installs waist rail template, makes waist
Beam forms is connected with template limiting plate by template connecting bolt, and subsequent casting concrete forms waist rail；
10), steel lattice column is constructed：Steel lattice column is laid at diagonal brace span centre position, steel lattice column bottom anchors into agent structure
In stake, top sets the hinged-support and pressure diffusion plate being connected with diagonal brace, and centre sets length adjusting screws；
11), diagonal brace is laid：Pressure jack is set towards concrete breast beam side in diagonal brace bottom support pier, holds bottom
Pressing plate is in close contact with pressure jack, the diagonal brace bearing plate at diagonal brace both ends is completely embedded respectively with waist rail, bottom support pier,
On diagonal brace surface, stress test sensor is set；Diagonal brace is set to be completely embedded with steel lattice column simultaneously；It is oblique by pressure jack pair
Support applies prestressing force, passes through pressure pier pressure-bearing after the completion of the reinforcing of pressure jack；
12), diagonal brace position soil excavation：After the completion of diagonal brace construction, then carry out diagonal brace position soil excavation, soil excavation mistake
The stress situation of change of simultaneous observation diagonal brace in journey, the Pressure behaviour born by changing diagonal brace control the stable shape of supporting construction
State；
13), foundation ditch shear wall construction：After the completion for the treatment of excavation of foundation pit, first the inner surface of campshed lays water barrier along foundation ditch,
Supporting module carries out shear wall concreting again and hole bottom remaining area Base isolation system pours；
14), diagonal brace is removed：After foundation ditch shear wall concrete strength meets to require, diagonal brace pressure on top surface is laid down at interval, progressively
Remove diagonal brace.
The beneficial effects of the invention are as follows：
(1) present invention is combination stressed using double-row pile and diagonal brace, while foundation pit supporting construction stability is ensured, realizes
Deformation, stable dynamic control in Excavation Process.
(2) present invention introduces half against method technique in Excavation Process, both can control in Excavation Process
The rebound deformation amount at bottom is cheated, in turn, ensures that the construction quality of diagonal brace bottom support pier, and diagonal brace and diagonal brace bottom support pier
Bonding strength.
(3) present invention sets vertical water-seal pile on the outside of outer campshed, and vertically water-seal pile axis insertion water proof flaggy,
Water barrier is pasted between interior campshed and shear wall, can effectively solve the problems, such as foundation ditch seepage failure, improves the change of foundation ditch impermeabilisation
The ability of shape.
Brief description of the drawings
Fig. 1 is that a kind of double-row pile of the present invention combines Deep Foundation Pit Support for Soft Soil constructing structure schematic diagram with diagonal brace；
Fig. 2 is Fig. 1 waist rail formwork erection schematic diagrames；
Fig. 3 is campshed and outer campshed connecting plate connection diagram in Fig. 1；
Fig. 4 is Fig. 1 bottoms bearing plate and diagonal brace bearing plate connection diagram；
Fig. 5 is that a kind of double-row pile of the present invention combines Deep Foundation Pit Support for Soft Soil construction process figure with diagonal brace；
Fig. 6 is soil body subregion excavation schematic diagram after the completion of campshed in Fig. 5, outer campshed, vertical sealing pile driving construction.
Description of reference numerals：Campshed in 1-；The outer campsheds of 2-；3- connecting plates；Curing area at the top of 4-；5- stake top coupling beams；6- is erected
To water-seal pile；7- water-stop sheets；The solid soil layer of 8- holes prime cement；9- Base isolation systems；10- diagonal braces；11- steel lattice columns；12- bottoms support
Pier；13- waist rails；14- anti-float anchor rods；15- agent structure stakes；16- bottoms bearing plate；17- connection dowels；18- water barriers；19-
Template limiting plate connecting hoop plate；20- connecting plate spacing rings；21- template limiting plates；22- connecting plate stopper slots；23- shear wall steel
Muscle passes through hole；24- diagonal brace bearing plates；25- pressure jack；26- pressure piers；27- stress test sensors；28- hinged-supports；
29- pressure diffusion plates；30- length adjusting screws；31- shear walls connect reinforcing bar；The 32- tops soil body；33- Base isolation systems；34- master
Body structural frames trestle；35- waist rail templates；The 36- diagonal braces position soil body；37- shear walls；38- anti-float anchor rods expand termination；39- is cut
Power wall reinforcing bar；The soil body on the outside of 40- foundation ditches；41- template connecting bolts.
Embodiment
Embodiments of the invention are described in further detail below in conjunction with brief description of the drawings, but the present embodiment is not used to limit
The system present invention, every similar structure using the present invention and its similar change, all should be included in protection scope of the present invention.
Construction technical requirement, concrete pouring construction technical requirements, the agent structure pile construction technology of pile for prestressed pipe will
Ask, the requirement of soil mass of foundation pit excavation construction technology, anti-float anchor rod design and construction technical requirements etc., it is no longer superfluous in present embodiment
State, emphasis illustrates that the present invention relates to the embodiment of structure.
Fig. 1 is that a kind of double-row pile of the present invention combines Deep Foundation Pit Support for Soft Soil constructing structure schematic diagram with diagonal brace, and Fig. 2 is Fig. 1
Waist rail formwork erection schematic diagram, Fig. 3 are Fig. 1 bottoms bearing plate and diagonal brace bearing plate connection diagram.Shown in 1~Fig. 3 of reference picture,
Structure of the present invention, set on the outside of the foundation ditch in campshed 1 and outer campshed 2, set between interior campshed 1 and outer campshed 2 connecting plate 3,
Top curing area 4, stake top coupling beam 5, vertical water-seal pile 6, the interior vertical water-stop sheet 7 of insertion of vertical water-seal pile 6；In bottom of foundation ditch in
The inner side of campshed 1 sets the solid soil layer 8 of hole prime cement；Diagonal brace 10 is set between interior campshed 1 and Base isolation system 9, in the span centre of diagonal brace 10
Vertical steel lattice column 11 is set；Diagonal brace 10 sets bottom support pier 12 with the joint of Base isolation system 9, set with the interior joint of campshed 1
Put waist rail 13；In the anti-float anchor rod 14 arranged below of Base isolation system 9 and agent structure stake 15.
Interior campshed 1 and outer campshed 2 are using the pile for prestressed pipe of diameter 500, the interior long 12m of campshed, the outer long 10m of campshed.In
Campshed 1 vertically lays template limiting plate connecting hoop plate 19 and connecting plate spacing ring 20.Template limiting plate connecting hoop plate 19 is using high
The stainless steel hoop of intensity, it is fastenedly connected with interior campshed 1, is welded to connect with template limiting plate 21.Template limiting plate 21 is using thick
20mm, the steel plate that strength grade is Q235.Connecting plate spacing ring 20 is laid from interior campshed 1 and the top down of outer campshed 2, circumferentially
One connecting plate stopper slot 22 is set, and limited impression is in inverted trapezoidal, top width 60mm, bottom width 100mm, high 60mm；In the interior He of campshed 1
Insertion connecting plate 3 in two corresponding connecting plate stopper slots 22 of outer campshed 2,3 thick 60mm of connecting plate, two sides set wide 90mm,
High 60mm trapezoidal joint, the concrete strength of connecting plate 3 is 40Mpa.
Top curing area 4, the solid soil layer 8 of hole prime cement are formed using drawing pore pressure note hardening slurry mode, and top curing area 4 is thick
2m, the solid thickness 2m of soil layer 8 of hole prime cement are spent, hardening slurry uses cement mortar.
Stake top coupling beam 5 uses reinforced beam, deck-siding 600mm, strength grade of concrete C35.
Vertical water-seal pile 6 uses diameter 600mm cement mixing pile.
Water-stop sheet 7 pastes the steel plate of geomembrane, steel plate thickness 10mm using side wall.
Base isolation system 9 is using thick 500mm armoured concrete slab, strength grade of concrete C25.
Diagonal brace 10 uses the H profile steel that long 8m, strength grade Q235, height and width are 300mm；Diagonal brace 10 and basis
The angle of raft plate 9 is 30 °.Diagonal brace bearing plate 24 is set at diagonal brace both ends, diagonal brace bearing plate 24 is at right angles welded to connect with diagonal brace 10；
Diagonal brace bearing plate 24 use long 800mm, wide 400mm, thick 20mm strength grades for Q235 steel plate；Bottom diagonal brace bearing plate 24 with
Pressure jack 25 and the contact of the surface of pressure pier 26；Pressure jack 25 locks pressure hydraulic jack automatically using 100t；Pressure pier
26 are formed using the H profile steel cutting that height and width are 300mm；The stress test sensor 27 on the surface of diagonal brace 10 and diagonal brace 10
Connection is pasted, stress test sensor 27 uses surface strain sensor of the resistance-strain type maximum range for 20mm.
Steel lattice column 11 is formed using the H profile steel cutting that height and width are 300mm, is set at the top of steel lattice column 11
Hinged-support 28 and pressure diffusion plate 29, centre set length adjusting screws 30.Hinged-support 28 is turned using diameter 40mm stainless steel
Axle.Pressure diffusion plate 29 use wide 400mm, long 500mm, thick 20mm, strength grade for Q235 rectangular steel plates.
Water barrier 18 is set to use geomembrane, water barrier 18 and interior campshed 1, basic raft between shear wall 37 and interior campshed 1
Plate 33 pastes connection.37 thick 500mm of shear wall, wall high 8m, strength grade of concrete C30.Water barrier 18 uses thick 10mm rubber
Film.
Bottom support pier 12 cross section bottom width 500mm, high 500mm, use concreting of the strength grade for C30.Bottom
Connection dowel 17 is set between portion's support pier 12 and Base isolation system 9.Dowel 17 is connected using diameter 32mm, long 1m screw-thread steel
Muscle.Bottom bearing plate 16 use long 800mm, wide 300mm, thick 20mm strength grades for Q235 steel plate.
The cross section of waist rail 13 is in " right-angled trapezium " shape, bottom, 300mm, top width 400, high 500mm, using armored concrete knot
Structure, strength grade of concrete C35.Shear force wall reinforcing steel bar is reserved on waist rail 13 reinforcing bar 31 is connected with shear wall through hole 23.Cut
Power wall reinforcing bar passes through 23 high 500mm of hole, diameter 30mm.Shear wall connection reinforcing bar 31 is using diameter 25mm, long 0.3m screw-thread steel
Muscle.
Anti-float anchor rod 14 forms anti-float anchor rod bellend using diameter 32mm, long 10m spiral, reinforcing bar bottom mud jacking
First 38.
Agent structure stake 15 uses digging hole filling pile, stake diameter 800mm.
Template connecting bolt 33 uses diameter 25mm stainless steel bolt.
Main structural frame post 34 uses square column of the width for 500mm, strength grade of concrete C40.
Waist rail template 35 uses thick 10mm, strength grade to be prefabricated into and the shape identical bottom panel of waist rail 13 for Q235 steel plates
And side panel.
Shear force wall reinforcing steel bar 39, as vertical reinforcement, is made using diameter 25mm spiral using diameter 20mm plain steel-bars
For transverse steel.
The foundation ditch internal upper part soil body 32, the diagonal brace position soil body 36, the soil body 40 is the muck soil of plastic state on the outside of foundation ditch.
A kind of double-row pile combines Deep Foundation Pit Support for Soft Soil construction method, including following construction procedure with diagonal brace：
1), field surveys：Required according to site operation, engineering site carry out engineering mapping, find out engineering geology soil nature,
Level of ground water, foundation ditch and the existing distance for closing on building, and campshed 1 in mark, outer campshed 2, agent structure stake 15 at the scene
Stake position；
2), interior campshed 1 and outer campshed 2 are constructed：Template limiting plate connecting hoop plate 19, connecting plate are inserted in the interior outside of campshed 1
Spacing ring 20, connecting plate spacing ring 20 is inserted on the outside of outer campshed, then sets pile for prestressed pipe straight down, campshed 1 in formation
With outer campshed 2, and ensure two connecting plate stopper slots 22 to being located along the same line；
3), vertical water-seal pile 6 is constructed：Between interior campshed 1 and outer campshed 2, close to interior campshed 1 it is lateral under set cement and stir
Stake is mixed, and before vertical water-seal pile concrete initial set, vertically the axis of water-seal pile 6 insertion water-stop sheet 7, makes the top mark of water-stop sheet 7 high
Less than the bottom absolute altitude of connecting plate 3；
4), connecting plate 3 is constructed：Connecting plate 3 is lifted to interior campshed 1 and outer campshed 2, inserts the side of connecting plate two
In the connecting plate stopper slot 22 of connecting plate spacing ring 20；
5), top curing area 4 is constructed：Before the vertical concrete final set of water-seal pile 6, between internal campshed 1 and outer campshed 2
Soil body pressure injection hardening slurry, form top curing area 4；
6), the foundation ditch internal upper part soil body 32 excavates：After construction supporting structure forms intensity, 1/3~1/2 in excavation pit
The soil body in altitude range, then platform slope outwards is taken to bottom of foundation ditch absolute altitude along among foundation ditch；
7), mid-section body structure and agent structure stake 15 are constructed：Agent structure stake 15 is carried out according to design stake position to construct,
Agent structure stake top sets Base isolation system 9 and main structural frame post 34, and is set in inner side of the bottom of foundation ditch along interior campshed 1
Cheat the solid soil layer 8 of prime cement；
8), diagonal brace bottom support pier 12 is constructed：Laid and required according to diagonal brace 10, bottom support is laid in hole bottom setting position
Pier 12；
9), waist rail 13 is constructed：Template limiting plate 21 is set in the inner side setting position of interior campshed 1, and installs waist rail template
35, waist rail template 35 is connected with template limiting plate 21 by template connecting bolt 33, subsequent casting concrete forms waist rail 13；
10), steel lattice column 11 is constructed：Steel lattice column 11 is laid at the span centre position of diagonal brace 10, the bottom of steel lattice column 11 anchors into
In agent structure stake 15, top sets the hinged-support 28 and pressure diffusion plate 29 being connected with diagonal brace 10, and centre sets length adjustment
Bolt 30；
11), diagonal brace 10 is laid：In diagonal brace bottom, support pier 12 sets pressure jack 25 towards the side of concrete breast beam 13,
Bottom bearing plate 16 is in close contact with pressure jack 25, make the diagonal brace bearing plate 24 at diagonal brace both ends respectively with waist rail 13, bottom
Portion's support pier 12 is completely embedded, and stress test sensor is set on diagonal brace surface；Diagonal brace 10 is set to be connected with steel lattice column 11 simultaneously
Closely；Prestressing force is applied to diagonal brace 10 by pressure jack 25, held after the completion of the very heavy 25 top reinforcing of pressure by pressure pier 26
Pressure；
12), the diagonal brace position soil body 36 excavates：After the completion of diagonal brace 10 is constructed, then carry out the diagonal brace position soil body 36 and excavate, the soil body
The stress situation of change of simultaneous observation diagonal brace 10 in digging process, the Pressure behaviour born by changing diagonal brace 10 control supporting knot
The stable state of structure.
13), foundation ditch shear wall 37 is constructed：After the completion for the treatment of excavation of foundation pit, first the inner surface of campshed 1 lays water proof along foundation ditch
Layer 18, then supporting module carries out the concreting of shear wall 37 and hole bottom remaining area Base isolation system 9 pours；
14), diagonal brace 10 is removed：After the concrete strength of foundation ditch shear wall 37 meets to require, the top pressure of diagonal brace 10 is laid down at interval
Power, progressively remove diagonal brace 10.
Claims (8)
1. a kind of double-row pile combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, it is characterised in that：Campshed in being set on the outside of foundation ditch
（1）With outer campshed（2）, in interior campshed（1）With outer campshed（2）Between connecting plate is set（3）, top curing area（4）, stake top coupling beam
（5）With vertical water-seal pile（6）, vertical water-seal pile（6）The vertical water-stop sheet of interior insertion（7）；In bottom of foundation ditch along interior campshed（1）'s
Inner side sets the solid soil layer of hole prime cement（8）；In interior campshed（1）With Base isolation system（9）Between diagonal brace is set（10）, in diagonal brace（10）Across
It is middle that vertical steel lattice column is set（11）；Diagonal brace（10）With Base isolation system（9）Joint sets bottom support pier（12）, diagonal brace
（10）With interior campshed（1）Joint sets waist rail（13）；In Base isolation system（9）Anti-float anchor rod arranged below（14）And agent structure
Stake（15）；The bottom support pier（12）Upper surface and diagonal brace（10）Vertically, and bottom bearing plate is laid（16）, supported in bottom
Pier（2）With Base isolation system（9）Between set connection dowel（17）；Described interior campshed（1）With outer campshed（2）Using prestressed pipe
Stake, along interior campshed（1）It is vertical to lay template limiting plate connecting hoop plate（19）With connecting plate spacing ring（20）；The template limiting plate
Connecting hoop plate（19）With interior campshed（1）It is fastenedly connected, the template limiting plate connecting hoop plate（19）With template limiting plate（21）Weldering
Connect in succession；Connecting plate spacing ring（20）From interior campshed（1）With outer campshed（2）Top down is laid, connecting plate spacing ring（20）Edge
It is arranged circumferentially a connecting plate stopper slot（22）；In interior campshed（1）With outer campshed（2）Two corresponding connecting plate stopper slots
（22）Interior insertion connecting plate（3）.
2. a kind of double-row pile according to claim 1 combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, it is characterised in that：Institute
State agent structure stake（15）Using digging hole filling pile；Vertical water-seal pile（6）Using cement mixing pile.
3. a kind of double-row pile according to claim 1 combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, it is characterised in that：Top
Portion curing area（4）Height original place 2-3m downwards from the outside of foundation ditch.
4. a kind of double-row pile according to claim 1 combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, it is characterised in that：Institute
State waist rail（13）Cross section is in a rectangular trapezoid, using reinforced concrete structure, in waist rail（13）With interior campshed（1）Intersection it is upper
Portion and bottom are respectively provided with template limiting plate（21）；In waist rail（13）Upper reserved shear force wall reinforcing steel bar passes through hole（23）Connected with shear wall
Reinforcing bar（31）.
5. a kind of double-row pile according to claim 1 combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, it is characterised in that：Institute
State diagonal brace（10）Using steel pipe or shaped steel, in diagonal brace（10）Both ends set diagonal brace bearing plate（24）, diagonal brace bearing plate（24）With it is oblique
Support（10）At right angles it is welded to connect；The diagonal brace bearing plate of bottom（24）With pressure jack（25）With pressure pier（26）Surface connects
Touch；Diagonal brace（10）The stress test sensor on surface（27）With diagonal brace（10）It is welded to connect or pastes connection.
6. a kind of double-row pile according to claim 1 combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, it is characterised in that：Institute
State steel lattice column（11）Top sets hinged-support（28）With pressure diffusion plate（29）, the steel lattice column（11）Centre sets length
Regulating bolt（30）, the steel lattice column（11）Bottom and agent structure stake（15）Top connects.
7. a kind of double-row pile according to claim 1 combines Deep Foundation Pit Support for Soft Soil structure with diagonal brace, it is characterised in that：Institute
State water-stop sheet（7）The steel plate of geomembrane or sheet rubber is pasted using side wall；Interior campshed（1）Outside is provided with shear wall（37）, shearing
Wall（37）With interior campshed（1）Between water barrier is set（18）, the water barrier（18）Using geomembrane or sheet rubber, water barrier
（18）With interior campshed（1）And Base isolation system（33）Paste connection.
8. a kind of double-row pile combines Deep Foundation Pit Support for Soft Soil construction method with diagonal brace, it is characterised in that including following construction procedure：
1）, field surveys：Required according to site operation, carry out engineering mapping in engineering site, find out engineering geology soil nature, underground
Water level, foundation ditch and the existing distance for closing on building, and campshed in mark at the scene（1）, outer campshed（2）, agent structure stake（15）
Stake position；
2）, interior campshed（1）With outer campshed（2）Construction：In interior campshed（1）It is inserted in template limiting plate connecting hoop plate in outside（19）, even
Fishplate bar spacing ring（20）, connecting plate spacing ring is inserted on the outside of outer campshed（20）, then pile for prestressed pipe is set straight down, formed
Interior campshed（1）With outer campshed（2）, and ensure two connecting plate stopper slots（22）To being located along the same line；
3）, vertical water-seal pile（6）Construction：In interior campshed（1）With outer campshed（2）Between, close to interior campshed（1）Water is set under lateral
Mud mixing pile, and before vertical water-seal pile concrete initial set, vertically water-seal pile（6）Axis inserts water-stop sheet（7）, make water-stop sheet
（7）Top mark height is in connecting plate（3）Bottom absolute altitude；
4）, connecting plate（3）Construction：By connecting plate（3）Lift to interior campshed（1）With outer campshed（2）Centre, make the side of connecting plate two
Insert connecting plate spacing ring（20）Connecting plate stopper slot（22）It is interior；
5）, top curing area（4）Construction：In vertical water-seal pile（6）Before concrete final set, internal campshed（1）With outer campshed（2）It
Between soil body pressure injection hardening slurry, formed top curing area（4）；
6）, the foundation ditch internal upper part soil body（32）Excavate：After construction supporting structure forms intensity, 1/3 ~ 1/2 is high in excavation pit
The soil body in the range of degree, then platform slope outwards is taken to bottom of foundation ditch absolute altitude along among foundation ditch；
7）, mid-section body structure and agent structure stake（15）Construction：Agent structure stake is carried out according to design stake position（15）Construction,
Agent structure stake top sets Base isolation system（9）With main structural frame post（34）, and in bottom of foundation ditch along interior campshed（1）It is interior
Side sets the solid soil layer of hole prime cement（8）；
8）, diagonal brace bottom support pier（12）Construction：According to diagonal brace（10）Lay and require, bottom support is laid in hole bottom setting position
Pier（12）；
9）, waist rail（13）Construction：In interior campshed（1）Inner side setting position set template limiting plate（21）, and install waist rail mould
Plate（35）, make waist rail template（35）With template limiting plate（21）Pass through template connecting bolt（33）Connection, subsequent casting concrete
Form waist rail（13）；
10）, steel lattice column（11）Construction：In diagonal brace（10）Lay steel lattice column in span centre position（11）, steel lattice column（11）Bottom
Anchor into agent structure stake（15）Interior, top is set and diagonal brace（10）The hinged-support of connection（28）With pressure diffusion plate（29）, it is middle
Length adjusting screws are set（30）；
11）, diagonal brace（10）Lay：In diagonal brace bottom support pier（12）Towards concrete breast beam（13）Side sets pressure jack
（25）, make bottom bearing plate（16）With pressure jack（25）It is in close contact, makes the diagonal brace bearing plate at diagonal brace both ends（24）Respectively
With waist rail（13）, bottom support pier（12）It is completely embedded, stress test sensor is set on diagonal brace surface；Make diagonal brace simultaneously（10）
With steel lattice column（11）It is completely embedded；Pass through pressure jack（25）To diagonal brace（10）Apply prestressing force, pressure jack（25）
Pass through pressure pier after the completion of reinforcing（26）Pressure-bearing；
12）, the diagonal brace position soil body（36）Excavate：Diagonal brace（10）After the completion of construction, then carry out the diagonal brace position soil body（36）Excavate, soil
Simultaneous observation diagonal brace in body digging process（10）Stress situation of change, by changing diagonal brace（10）The Pressure behaviour control born
The stable state of supporting construction；
13）, foundation ditch shear wall（37）Construction：After the completion for the treatment of excavation of foundation pit, the first campshed along foundation ditch（1）Inner surface laying water proof
Layer（18）, then supporting module progress shear wall（37）Concreting and hole bottom remaining area Base isolation system（9）Pour；
14）, diagonal brace（10）Remove：Treat foundation ditch shear wall（37）Concrete strength meets after requiring that diagonal brace is laid down at interval（10）Top
Pressure, progressively remove diagonal brace（10）.
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