CN110397057A - A kind of soft soil area Self-sinking type steel open caisson support system and method - Google Patents
A kind of soft soil area Self-sinking type steel open caisson support system and method Download PDFInfo
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- CN110397057A CN110397057A CN201910702625.5A CN201910702625A CN110397057A CN 110397057 A CN110397057 A CN 110397057A CN 201910702625 A CN201910702625 A CN 201910702625A CN 110397057 A CN110397057 A CN 110397057A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 199
- 239000010959 steel Substances 0.000 title claims abstract description 199
- 239000002689 soil Substances 0.000 title claims abstract description 77
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
Abstract
The invention discloses a kind of soft soil area Self-sinking type steel caisson structure, including several it is vertically arranged and successively end to end box unit, box unit include four blocks of steel plates, several reinforcement channel steels and several steel pipe A；Four blocks of steel plates integrally enclose framework, and surrounding arrangement reinforces channel steel on the outside of framework, reinforce interval on channel steel and install several steel pipe A；The steel pipe A of upper and lower two box units is to positive connection；For end entrance by hose and high-pressure hydraulic pump, its lower end the steel pipe A of bottom box unit is equipped with spray head to the steel pipe A of top layer box unit thereon.The invention also discloses a kind of soft soil area Self-sinking type steel open caisson support system and methods.The invention has the benefit that accelerating fall rate by way of high hydraulic pressure cutting of steel caisson structure bottom soil body, shortening the construction period；At the initial stage of excavation, steel caisson structure has sunk down into predetermined absolute altitude, has formed stable build-in body, improves the stability and safety of building enclosure.
Description
Technical field
The present invention relates to hypogee structure construction technology fields, and in particular to a kind of soft soil area Self-sinking type steel open caisson branch
Protecting system and method.
Background technique
With the development and expansion of urban construction, the development and utilization of the underground space is taken seriously further, soft soil area base
Going along with sb. to guard him and excavating for hole is technical problem that underground space development primarily solves.Subway, the tunnel, underground parking garage of routine
Etc. the underground spaces structure of similar " cheating in hole ", such as sump, elevator, Bridge Piers cushion cap small-scale pit can be set, should
Structure shows the engineering characteristics such as deep excavation, limited space, high water level, excavates, shadow big with the deformation of building enclosure caused by precipitation
It is wide to ring range.Therefore, supporting need to be carried out to structure is cheated in hole.
Currently, conventional method for protecting support includes slope excavation, Reinforcement with Cement-mixed Piles, composite soil nailing wall, campshed supporting etc.,
But the above-mentioned generally existing cost of method for protecting support is high, site requirements is high, needs the problems such as using heavy mechanical equipment.And open caisson conduct
One kind of supporting construction is applied in engineering construction by the features such as its space occupied is small, overall stiffness is big, applied widely
It is more and more extensive.However, conventional caisson structure sinks in digging process, blade foot building-in depth is limited, to soil pressure and ground
The resistance effect being lauched is unobvious, and fall rate is slow；In high water level region, excavates and back cover difficulty is big, be easy to cause in open caisson
Portion's uplift of soil, periphery surface subsidence are unfavorable for the stability of foundation pit.
Summary of the invention
It is an object of the present invention in view of the deficiencies of the prior art, a kind of soft soil area that subsidence velocity is fast is provided and is drowned oneself
Formula steel open caisson support system and method.
The technical solution adopted by the present invention are as follows: a kind of soft soil area Self-sinking type steel caisson structure, including several be vertically arranged
And successively end to end box unit, box unit include four blocks of steel plates, several reinforcement channel steels and several steel pipe A；Described four
Block steel plate integrally encloses framework, and surrounding arrangement reinforces channel steel on the outside of framework, reinforces interval on channel steel and installs several steel pipe A；On
The steel pipe A of lower two box units is to positive connection；End entrance passes through hose and high-pressure hydraulic pump to the steel pipe A of top layer box unit thereon
Connection, its lower end the steel pipe A of bottom box unit are equipped with spray head, and the water being passed through from the steel pipe A of top layer box unit is through each layer
It is sprayed after the steel pipe A of box unit from the steel pipe A lower end spray head of bottom box unit.
According to the above scheme, the spray head includes the shell of cone, and shell outer peripheral surface circumferential direction lays spray orifice, and on outer peripheral surface
Spray orifice in cruciform symmetry type be distributed, into shell water can from its outer peripheral surface spray orifice radially spray；On shell lower end surface
Uniform intervals arrange several spray orifices, and the water into shell can axially be sprayed from the spray orifice of its end face.
According to the above scheme, the top of the framework is equipped with cross bar, the fixed multiple stop collars in interval, the steel on the cross bar
Pipe B is vertically passed through from stop collar.
According to the above scheme, quadrangle is equipped with angle brace on the inside of the framework of box unit；Two blocks of steel plates connection of quadrangle on the outside of framework
Place uses angle steel reinforced.
The present invention also provides a kind of soft soil area Self-sinking type steel open caisson support systems, including are set on the outside of foundation pit contour line
Groove, steel caisson structure, sedimentation basin and tank described in any one of Claims 1 to 5, the bottom of the groove is poured
Concrete hardening is built, the outer side edges of groove build brick wall；The steel caisson structure is set on the inside of groove, groove and the block on the outside of it
Formation plasma discharge channel between brick wall is built, sets an overflow port at the top of plasma discharge channel, overflow port is connected to sedimentation basin, and sedimentation basin passes through
Link slot is connected to tank.
The present invention also provides a kind of soft soil area Self-sinking type steel open caisson method for protecting support, method includes the following steps:
Step 1: measurement foundation pit and unwrapping wire, groove is built on the outside of foundation pit contour line as plasma discharge channel, plasma discharge channel
Overflow port is arranged as mud outlet mouth in top:
Step 2: sedimentation basin and tank that the overflow port in setting and plasma discharge channel is sequentially communicated；
Step 3: designing and making each box unit of steel caisson structure according to foundation pit size:
Step 4: the first section box body unit made is installed in groove, the steel pipe A of box unit side wall passes through water pipe
It is connect with high-pressure hydraulic pump, after checking each joint sealing securely and carries out pilot flood test, guarantee the sealing performance of whole system；
Step 5: high pressure water is injected into steel pipe A by water pump, the high pressure water flushing sprayed from the spray orifice of nozzle housing end
The soil body of the bottom steel pipe A is hit, after driving first section box body unit to sink down into design position, the second section box unit is lifted on first section
It in box unit and welds, then fills the water and sink down into predetermined absolute altitude, subsequent box unit continues assembly according to the above method, until bottom
Box unit sink down into predetermined depth；The cement slurry overflow generated in box unit sinking watching passes through mud to sedimentation basin
Stock pump pumps out while injecting new mud in open caisson, and mud face in open caisson is kept to stablize；
Step 6: steel caisson structure and surrounding soil body junction are closed using low grade concrete, prevent slurries when slip casting from outflowing；
By Double-liquid mud-injection pump, into steel pipe A, low pressure injects dual slurry, is hardened around open caisson using the chemical reaction of two kinds of injection slurries
The soil body.Slip casting washes pipe to steel pipe injected clear water before completing；
Step 7: conserved under field conditions (factors) after the completion of slip casting, by the way of rushing native pump drainage paragraph by paragraph, successively remove open caisson
The interior soil body: the steel pipe B on cross bar is inserted into open caisson in the soil body, and fills mud；High pressure water is injected by steel pipe B, to steel
The soil body " breaking up " in open caisson is mixed into mud by the cutting of pipe B bottom soil body, is precipitated via slush pump pump drainage to sedimentation basin,
New mud is injected simultaneously, keeps mud circulation in open caisson；
Step 8: the soil body in open caisson is cleared up to set absolute altitude, in open caisson inside circumference built-in slip casting pipe, slip casting tube top
Portion is connect with steel caisson structure, and injected hole is arranged in the bottom level section surrounding of Grouting Pipe；Graded broken stone is uniformly thrown into open caisson,
The assembled several precast concrete plates of surface layer.
Step 9: inject dual slurry into caisson inside circumference built-in slip casting pipe by Double-liquid mud-injection pump, filling rubble and
Precast slab hole；It stands, the slurries in pump drainage caisson, and the layering setting angle brace on the inside of box unit.
According to the above scheme, in step 5, when the angle point absolute altitude difference of steel caisson structure is more than controlling value, pass through top
Increase counterweight and the form locally filled the water carries out tuningout；The depth of steel caisson structure and the ratio of foundation depth is maintained at 1.5~
2.5, according to the mechanical characteristic of the live soil body and level of ground water situation, steel well sinking depth is adjusted, while keeping steel open caisson knot
The absolute altitude of structure is higher than earth's surface 30cm.
According to the above scheme, in step 5, cement slurry is injected in water filling into open caisson and groove before sinking, and keeps
Mud is continuously circulated in journey.
According to the above scheme, in step 9, examination pump drainage, monitoring closely during pump drainage are carried out in open caisson before slurries pump drainage
The deformation of steel caisson structure and the periphery soil body continues to mend slurry reinforcement by outside steel pipe if sedimentation and deformation is larger.
The invention has the benefit that
(1) mechanical equipment is limited by space, place during the present invention solves existing support construction, steel open caisson
The absolute altitude of steel caisson structure can be adjusted flexibly by the way of segmentation, merogenesis scene processing and fabricating in structure.Live processing technology
Simply, it is convenient to operate, and turns parts into the whole, avoids the investment of heavy mechanical equipment.
(2) present invention solves the defect that fall rate is slow in existing open caisson support technology, has reversed and has first excavated to sink afterwards
Sequence of construction.By way of high hydraulic pressure cutting of steel caisson structure bottom soil body, fall rate is accelerated, construction work is shortened
Phase；At the initial stage of excavation, steel caisson structure has sunk down into predetermined absolute altitude, has formed stable build-in body, improve the steady of building enclosure
Qualitative and safety.
(3) present invention solves the problems, such as that soft soil area soil bearing capacity is low, permeability is big, stability is poor, utilizes water filling
Pipe realizes a Guan Shuanyong as Grouting Pipe.Steel caisson structure bottom and surrounding soil are reinforced by dual slurry, improves the mechanics of the soil body
Performance, it is ensured that the soil body and steel caisson structure that steel open caisson periphery has disturbed are closely connected, reduce in digging process under steel caisson structure
Heavy value.
(4) present invention solves influence of the precipitation to surrounding enviroment in work progress, and the steel for completion of having sunk before excavating is heavy
Well construction and stabilization zone are made to play the effect of water-stop curtain.It replaces excavating equipment using high-pressure water pipe, realizes submersible, benefit
With the effect of mud balance open caisson sidewall earth pressure and ground water pressure, avoid collapsing for the open caisson periphery soil body existing with Sand
.
(5) present invention solves the problems, such as the underwater back cover of open caisson, by the pre-buried slip casting steel pipe in bottom, topping laying rubble,
The mode for installing precast concrete plate and slip casting, realizes the underwater back cover of open caisson.Back cover simple process, progress are fast.
Detailed description of the invention
Fig. 1 is the elevation of steel caisson structure in the present invention.
Fig. 2 is the plan view of steel caisson structure.
Fig. 3 is the connection schematic diagram of cross bar and steel pipe.
Fig. 4 is the structural schematic diagram of spray head.
Fig. 5 is the schematic diagram of heretofore described support system.
Fig. 6 is trench profile schematic diagram.
Fig. 7 is the schematic diagram of double slurries grouting systems.
Fig. 8 is the arrangement schematic diagram of open caisson bottom Grouting Pipe.
Fig. 9 is precast concrete plate structural plan layout drawing.
Figure 10 is the structural schematic diagram of precast concrete plate.
Figure 11 is the sectional view of open caisson bottom.
Wherein: 1, steel plate；2, steel pipe A；3, steel pipe B；4, stop collar；5, reinforce channel steel；6, cross bar；7, angle brace；8, angle steel；
9, hose coupling；10, anchor ear；11, sedimentation basin；12, tank；13, groove；14, link slot；15, overflow port；16, brick wall；
17, bottom hardening structure；18, peripheral hardening structure；19, spray head connector；20, spray head；20.1, shell；20.2, spray orifice；21, it stirs
Mix pond A；22, pulp storage tank A；23, pulp storage tank B；24, orifice pressure gage；25, waster valve；26, Grouting Pipe；27, precast concrete plate；
27.1, crotch；27.2, reinforcing bar；28, connection structure；29, graded broken stone；30, stirring pool B；31, Double-liquid mud-injection pump.
Specific embodiment
For a better understanding of the present invention, the present invention is further described in the following with reference to the drawings and specific embodiments.
A kind of soft soil area Self-sinking type steel caisson structure as shown in Fig. 1~2, including it is several be vertically arranged and successively head and the tail
Connected box unit, box unit include four blocks of steel plates 1, several reinforcement channel steels 5 and several steel pipe A2；Four blocks of steel plates 1
Framework is enclosed, surrounding is installed along short transverse interval on the outside of framework reinforces channel steel 5, reinforces interval on channel steel 5 and installs several steel
Pipe A2 (perfectly even interval installation, spacing are 30~50cm)；The framework of upper and lower two box units to just and pass through bolt connect
It connects；The steel pipe A2 of upper and lower two box units (can be threaded connection, i.e., the lower end steel pipe A2 of a upper box unit is inserted to positive connection
Enter on the steel pipe A2 of next box unit in terminal filament mouth)；End entrance passes through hose and height to the steel pipe A2 of top layer box unit thereon
Water pump is connected (being connected especially by hose coupling 9 with hose), its lower end the steel pipe A2 of bottom box unit is equipped with spray head
20 (lower end steel pipe A2 is connected by spray head connector 19 with spray head 20), the water being passed through from the steel pipe A2 of top layer box unit is through each layer
It is sprayed after the steel pipe A2 of box unit from the lower end the steel pipe A2 spray head 20 of bottom box unit.
Preferably, as shown in figure 4, the spray head 20 includes the shell 20.1 of cone, between 20.1 outer peripheral surface of shell is circumferential
Every laying spray orifice 20.2, and the spray orifice 20.2 on outer peripheral surface is distributed in cruciform symmetry type and (reduces cloth hole amount towards soil body side), into
The water for entering shell 20.1 can be sprayed from the spray orifice 20.2 on its outer peripheral surface is radial；If uniform intervals are arranged on 20.1 lower end surface of shell
Dry spray orifice 20.2, the water into shell 20.1 can axially be sprayed from the spray orifice 20.2 of its end face.In the present invention, the spray orifice 20.2
Aperture be 0.2~0.5cm.
Preferably, it as shown in figure 3, the top of the steel caisson structure is equipped with cross bar 6, is spaced along its length on cross bar 6
Several steel pipe B3 are installed.In the present embodiment, stop collar 4 is set on cross bar 6, steel pipe B3 is vertically worn from the stop collar 4 on cross bar 6
It crosses, steel pipe B3 is connected by anchor ear 10 with cross bar 6；The lower part of steel pipe B3 is circumferentially in blossom type cloth hole.
Preferably, quadrangle is equipped with angle brace 7 on the inside of the framework of box unit, and angle brace 7 is made of I-steel；Four on the outside of framework
Two pieces of 1 junctions of steel plate at angle are reinforced using angle steel 8.Reinforce setting stop collar 4 on channel steel 5, steel pipe A2 is from the limit on reinforcement channel steel 5
It is vertically passed through in the ring 4 of position, steel pipe A2 is connected by anchor ear 10 with channel steel 5 is reinforced.
A kind of soft soil area Self-sinking type steel open caisson support system as shown in Figure 5, including being set on the outside of foundation pit contour line
Groove 13, steel caisson structure as described above, sedimentation basin 11 and tank 12, the groove 13 set bottom hardening structure 17 and (pour
Concrete hardening), the outer side edges of groove 13 build brick wall 16 and set peripheral hardening structure 18, as shown in Figure 6；The steel open caisson knot
Structure is set to the inside of groove 13, forms plasma discharge channel between groove 13 and masonry brick wall 16 on the outside of it, plasma discharge is set at the top of channel
One overflow port 15, overflow port 15 are connected to sedimentation basin 11, and sedimentation basin 11 is connected to by link slot 14 with tank 12.The present invention
In, the gradient of link slot 14 is 3%~5%.
Silt, the just branch construction, and level of ground water of flour sand region progress dark-excavated passageway (tunnel) ponding well are pressed from both sides in silty clay
When higher than foundation pit ground, channel interior narrow space, no well-points dewatering condition, quicksand phenomenon is serious in digging process.Below with
For foundation pit having a size of 3m × 3.5m × 4m (depth), to a kind of soft soil area Self-sinking type steel open caisson supporting side provided by the invention
Method is described in detail.
A kind of soft soil area Self-sinking type steel open caisson method for protecting support, method includes the following steps:
Step 1: measurement foundation pit and unwrapping wire, build groove 13 on the outside of foundation pit contour line and are used as plasma discharge channel, plasma discharge channel
Top setting overflow port 15 be used as mud outlet mouth: in the present embodiment, 13 sectional dimension of groove be 50cm × 50cm, groove 13
Bottom pours the C20 concrete hardening of 5cm thickness, and 13 outer side edges of groove build the thick brick wall 16 of 12cm, and smear the cement bonded sand of 2cm thickness
Slurry.
Step 2: sedimentation basin 11 and tank 12 that setting is sequentially communicated with the overflow port 15 in plasma discharge channel, visual field it is big
Small situation adjusts 12 amount of capacity of tank, and overflow port 15, sedimentation basin 11 pass sequentially through the company of link slot 14 between tank 12
It connects, it is ensured that from high to low, flowing water is unimpeded for three's absolute altitude.Sedimentation basin 11 is used to store the body refuse in mud, flows into storage after precipitation
Case is starched, then is pumped into foundation pit by mud, mud recycles；Sedimentation basin 11 carries out periodic cleaning sediment, it is ensured that memory capacity.
In the present embodiment, the volume of sedimentation basin 11 is 2m3, the volume of tank 12 is 2.5m3；The gradient of link slot 14 is 3%.
Step 3: designing and making each box unit of steel caisson structure according to foundation pit size:
1, according to foundation depth and planar dimension, each component for making steel caisson structure and element are transported to construction site,
And sub-unit section assembly forms, the height of each box unit is maintained at 1.5m or so.
2, welded limiting ring 4 on the outside of the framework of box unit, penstock installation is in stop collar 4.Interval root between steel pipe
It is designed according to water pressure.It is connected for the ease of the steel pipe of upper and lower two box units, by the upper end processed filament mouth of steel pipe, a upper case
The steel pipe lower end of body unit is inserted into the silk mouth of next box unit steel pipe upper end and is connected through a screw thread；The steel of bottom box unit
Its lower end spray head 20 coniform by sleeve connection is managed, seam crossing winds adhesive waterproof tape.
3,20 shell of spray head, 20.1 end arrange 3 spray orifices 20.2,20.1 outer peripheral surface circumferential direction cloth hole of shell and be in cross pair
The distribution of title type reduces cloth hole amount towards soil body side；Shell 20.1 and the spray orifice of end 20.2,20.2 aperture of spray orifice are 0.3cm.
Step 4: the first section box body unit made is installed in groove 13, and to the absolute altitude at four angles of box unit
It measures, it is ensured that any two corners absolute altitude difference is in ± 50mm；The steel pipe of box unit side wall is connected by hose and high-pressure hydraulic pump
It connects, after checking each joint sealing securely and carries out pilot flood test, guarantee the sealing performance of whole system.
Step 5: injecting high pressure water into steel pipe by water pump, sprayed from the spray orifice 20.2 of 20 shell of spray head, 20.1 end
The bottom high pressure water impact steel pipe A2 the soil body, drive steel caisson structure sink, from the spray orifice of 20 shell of spray head, 20.1 outer wall
20.2 spray high pressure water impact steel pipe A2 on the outside of the soil body, formed cavity, the cement slurry of steel pipe bottom under the action of water pressure on
It gushes, drives body refuse to import through 15 overflow of overflow port to sedimentation basin 11, and pump out by slush pump, while new mud injection steel being sunk
In well, (mud, body refuse from 15 overflow of overflow port to sedimentation basin 11 are precipitated mud face stabilization, remainder in holding open caisson
Divide to be discharged into stir in stirring pool and form new mud, so that mud is recycled).
When the angle point absolute altitude difference of steel caisson structure is more than controlling value, counterweight and the locally shape that fills the water are increased by top
Formula carries out tuningout.After first section box body unit sinks down into design position, the second section box unit is lifted on first section box body unit
And weld, then fill the water and sink down into predetermined absolute altitude, subsequent box unit continues assembly according to the above method, until the box unit of bottom
Sink down into predetermined depth.The depth of steel caisson structure and the ratio of foundation depth are maintained at 1.5~2.5, according to the live soil body
Mechanical characteristic and level of ground water situation adjust steel well sinking depth, while the absolute altitude of steel caisson structure being kept to be higher than earth's surface
30cm。
In soft soil area, soil strength is low, and operating pressure is maintained at 1~2.0Mpa when double-fluid grouting machine fills the water, according to existing
Heavy situation off field, the fall rate of steel caisson structure is controlled by adjusting pressure valve.Water filling is sunk preceding to open caisson and groove 13
Interior injection cement slurry, and keep mud persistent loop in sinking watching.
Step 6: steel caisson structure and surrounding soil body junction are closed using low grade concrete, prevent slurries when slip casting from outflowing；
After low grade concrete strength reaches 80%, by double slurries grouting systems (as shown in Figure 6), into steel pipe, low pressure injects dual slurry,
Open caisson surrounding soil is hardened using the chemical reaction of two kinds of injection slurries.After the completion of slip casting, injects a small amount of clear water and wash pipe.
As shown in fig. 7, double slurries grouting systems include stirring pool A21, the pulp storage tank being connected to stirring pool A21, stirring pool
B30, the pulp storage tank B23 being connected to stirring pool B30 and Double-liquid mud-injection pump 31, the pulp storage tank A22 and pulp storage tank B23 divide equally
Not Tong Guo mixer be connected to the entrance of Double-liquid mud-injection pump 31, the outlet of Double-liquid mud-injection pump 31 passes through the top of pipeline and steel pipe A2
It is connected to, is equipped with orifice pressure gage 24 and waster valve 25 on pipeline.In the present embodiment, blender is set respectively in two stirring pools；
Two kinds of slurries are prepared in two stirring pools respectively, and be pumped into the above two mixed in mixer, after mixing, indentation ground
0.3~0.6Mpa of grouting pressure in layer.
Injecting paste material: ordinary cement-waterglass dual slurry.Ordinary cement-waterglass dual slurry ratio: W:C=(0.8~1):
1, C:S=1:1, grout coordinate ratio can be adjusted according to grouting and reinforcing test effect.Strength of cement grade: P.O.42.5R；Water glass
Glass modulus should be between 2.4~3.2, and concentration is no less than 40 ° of B é, are preferably diluted with water using preceding to 20 ° of é~35 ° B B é.
When slip casting, first boiled water slush pump after 5min, determines after gelling time boiled water glass again according to single liquid grout absorption size
Slurries pump.Injection slurry is short after answering first dilute rear dense, gel time first to grow, but not preferably less than 30s.Flow is constant, pressure through 20~
When 30min does not rise, level-one slurries should be thickened；Flow is sharply reduced, and when pressure is risen quickly, should be let down level-one slurries.
Step 7: after conserving 2d under natural conditions, paragraph by paragraph, successively being removed by the way of rushing native pump drainage after the completion of slip casting
The soil body in open caisson: the steel pipe B3 on cross bar 6 is inserted into open caisson in the soil body, and fills mud；By into 6 steel pipe B3 of cross bar
High pressure water is injected, the cutting to steel pipe B3 bottom soil body is realized, the soil body " breaking up " is mixed into mud, extremely via slush pump pump drainage
Sedimentation basin 11.
The soil body in open caisson is excavated by the way of " rushing native pump drainage ", and cross bar 6,6 both ends of cross bar and steel are arranged at the top of framework
The side wall of caisson structure passes through screw-tightened.Spaced set steel pipe B3 on cross bar 6, steel pipe B3 and cross bar 6 are connected using anchor ear 10
It connects.Silk mouth is arranged convenient for connection in the bottom the steel pipe B3 region 1m Guan Zhoucheng blossom type cloth hole, the end steel pipe B3, it is ensured that connection paragraph by paragraph, it can
It splits.
Step 8: the soil body in open caisson is cleared up to designed elevation, in 26 (such as Fig. 8 of open caisson inside circumference built-in slip casting pipe
It is shown), it is L-shaped on 26 facade of Grouting Pipe；26 top of Grouting Pipe is connect with steel caisson structure, and the bottom level section of Grouting Pipe 26 is in
Injected hole is arranged in blossom type；Into open caisson, bottom is uniformly shed graded broken stone 29 (30cm~50cm), keeps top surface flatness good
It is good；The assembled several precast concrete plates 27 (as shown in Figure 9 and Figure 10) of surface layer, block-by-block connection are layered in rubble surface layer, such as Figure 11 institute
Show.In the present embodiment, as shown in figure 9, the precast concrete plate 27 includes plate body, boss and groove, boss end sets overhanging curved
Hook 27.1, reinforcing bar 27.2 built in groove, can pass through boss between adjacent two pieces of precast concrete plates 27 and groove is inserted and spelled；Boss insertion is recessed
After slot, crotch 27.1 can be connect with reinforcing bar 27.2, and reinforcing bar 27.2 forms connection structure 28 with crotch 27.1 and is adapted.
Step 9: injecting dual slurry into open caisson inside circumference built-in slip casting pipe 26 by Double-liquid mud-injection pump 31, fill broken
Stone and precast slab hole；Pipe is washed at interval of a pipe injected clear water after the completion of slip casting.2d is stood, to slurries in open caisson
Carry out examination pump drainage, it is ensured that (when water percolating capacity is larger, continue to infuse into Grouting Pipe 26 inside open caisson when water percolating capacity is smaller in open caisson
Slurry), formal pump drainage.Layering setting angle brace 7 (angle brace 7 and circumferential channel steel keep unified absolute altitude).Monitoring closely during pump drainage
The deformation of steel caisson structure and the periphery soil body continues to mend slurry reinforcement by outside steel pipe if sedimentation and deformation is larger.
Present invention design by multiple box units steel caisson structure for being sequentially connected up and down, using steel plate 1 as go along with sb. to guard him with
Seal is connected using channel steel and steel pipe as the main stress frame of building enclosure by on-site consolidation, is realized under merogenesis segmentation
It is heavy.Make steel caisson structure with the soil body of high -pressure water cutting steel caisson structure bottom using steel pipe as the conveyance conduit of high pressure water
Sink under Gravitative Loads, effectively shortens sinking time.Steel caisson structure top layout cross bar 6 and steel pipe, by cross bar 6
The soil body inside high -pressure water cutting open caisson is injected in steel pipe, and the soil body is discharged using slush pump.The soil body is cleared up to absolute altitude inside open caisson
Afterwards, built-in slip casting pipe 26, laying graded broken stone 29 and precast concrete plate 27, injection dual slurry carry out back cover.The present invention utilizes high pressure
The Water Cutting soil body realizes steel caisson structure from sinking, effectively shortens sinking time；Pass through the construction party excavated afterwards that first sinks
Formula optimizes the force modes of conventional open caisson, is effectively utilized the passive area soil body, improves the stabilization of structure and surrounding enviroment
Property；In the way of bath pump drainage, submersible is realized；Using rubble is laid with, the mode for installing concrete plate and slip casting is solved
The problem of underwater back cover.
Finally it should be noted that these are only the preferred embodiment of the present invention, it is not intended to restrict the invention, although
Referring to embodiment, invention is explained in detail, for those skilled in the art, still can be to aforementioned
Technical solution documented by each embodiment is modified or equivalent replacement of some of the technical features, but it is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (9)
1. a kind of soft soil area Self-sinking type steel caisson structure, which is characterized in that be vertically arranged and successively join end to end including several
Box unit, box unit include four blocks of steel plates, several reinforcement channel steels and several steel pipe A；Four blocks of steel plates integrally enclose
At framework, surrounding arrangement reinforces channel steel on the outside of framework, reinforces interval on channel steel and installs several steel pipe A；Upper and lower two box units
Steel pipe A to positive connection；End entrance is connect by hose with high-pressure hydraulic pump the steel pipe A of top layer box unit thereon, bottom cabinet
Its lower end the steel pipe A of unit is equipped with spray head, steel pipe of the water through each layer box body unit being passed through from the steel pipe A of top layer box unit
It is sprayed after A from the steel pipe A lower end spray head of bottom box unit.
2. Self-sinking type steel caisson structure in soft soil area as described in claim 1, which is characterized in that the spray head includes cone
Shell, shell outer peripheral surface circumferential direction lay spray orifice, and the spray orifice on outer peripheral surface in cruciform symmetry type distribution, the water into shell can
It is radially sprayed from the spray orifice on its outer peripheral surface；Uniform intervals arrange several spray orifices on shell lower end surface, and the water into shell can be from
The spray orifice of its end face axially sprays.
3. Self-sinking type steel caisson structure in soft soil area as described in claim 1, which is characterized in that the top of the framework is equipped with
Cross bar, the fixed multiple stop collars in interval, the steel pipe B are vertically passed through from stop collar on the cross bar.
4. Self-sinking type steel caisson structure in soft soil area as described in claim 1, which is characterized in that on the inside of the framework of box unit
Quadrangle is equipped with angle brace；Two pieces of steel plate junctions of quadrangle use angle steel reinforced on the outside of framework.
5. a kind of soft soil area Self-sinking type steel open caisson support system, which is characterized in that including the ditch being set on the outside of foundation pit contour line
Steel caisson structure, sedimentation basin and tank described in any one of slot, Claims 1 to 5, the bottom of the groove pour mixed
Solidifying soil hardening, the outer side edges of groove build brick wall；The steel caisson structure is set on the inside of groove, groove and the masonry brick on the outside of it
Plasma discharge channel is formed between wall, sets an overflow port at the top of plasma discharge channel, overflow port is connected to sedimentation basin, and sedimentation basin passes through connection
Slot is connected to tank.
6. a kind of soft soil area Self-sinking type steel open caisson method for protecting support, which is characterized in that method includes the following steps:
Step 1: measurement foundation pit and unwrapping wire, build groove as plasma discharge channel, the top in plasma discharge channel on the outside of foundation pit contour line
Overflow port is set as mud outlet mouth:
Step 2: sedimentation basin and tank that the overflow port in setting and plasma discharge channel is sequentially communicated；
Step 3: designing and making each box unit of steel caisson structure according to foundation pit size:
Step 4: the first section box body unit made is installed in groove, the steel pipe A of box unit side wall passes through water pipe and height
Water pump connection after checking each joint sealing securely and carries out pilot flood test, guarantees the sealing performance of whole system；
Step 5: high pressure water is injected into steel pipe A by water pump, the high pressure water impact steel sprayed from the spray orifice of nozzle housing end
Second section box unit is lifted on first section box body after driving first section box body unit to sink down into design position by the soil body of the bottom pipe A
It on unit and welds, then fills the water and sink down into predetermined absolute altitude, subsequent box unit continues assembly according to the above method, until the case of bottom
Body unit sinks down into predetermined depth；The cement slurry overflow generated in box unit sinking watching passes through slush pump to sedimentation basin
It pumps out, while new mud being injected in open caisson, mud face is kept to stablize；
Step 6: steel caisson structure and surrounding soil body junction are closed using low grade concrete, prevent slurries when slip casting from outflowing；Pass through
Double-liquid mud-injection pump low pressure into steel pipe A injects dual slurry, and open caisson surrounding soil is hardened using the chemical reaction of two kinds of injection slurries.
Slip casting washes pipe to steel pipe injected clear water before completing；
Step 7: being conserved under field conditions (factors) after the completion of slip casting, paragraph by paragraph, successively removed in open caisson by the way of rushing native pump drainage
The soil body: the steel pipe B on cross bar is inserted into open caisson in the soil body, and fills mud；High pressure water is injected by steel pipe B, to the bottom steel pipe B
The soil body " breaking up " in open caisson is mixed into mud by the cutting of portion's soil body, is precipitated via slush pump pump drainage to sedimentation basin, is infused simultaneously
Enter new mud, keeps mud circulation in open caisson；
Step 8: the soil body in open caisson is cleared up to set absolute altitude, at the top of open caisson inside circumference built-in slip casting pipe, Grouting Pipe with
Injected hole is arranged in the bottom level section surrounding of the connection of steel caisson structure, Grouting Pipe；Graded broken stone, surface layer are uniformly thrown into open caisson
Assembled several precast concrete plates.
Step 9: inject dual slurry into open caisson inside circumference built-in slip casting pipe by Double-liquid mud-injection pump, rubble and prefabricated is filled
Concrete slab hole；It stands, the slurries in pump drainage open caisson, and the layering setting angle brace on the inside of box unit.
7. soft soil area Self-sinking type steel open caisson method for protecting support as claimed in claim 6, which is characterized in that in step 5, when
When the angle point absolute altitude difference of steel caisson structure is more than controlling value, counterweight is increased top and is adjusted by way of locally filling the water
Partially；The depth of steel caisson structure and the ratio of foundation depth are maintained at 1.5~2.5, according to the mechanical characteristic and ground of the live soil body
Lower water level conditions adjust steel well sinking depth, while the absolute altitude of steel caisson structure being kept to be higher than earth's surface 30cm.
8. soft soil area Self-sinking type steel open caisson method for protecting support as claimed in claim 6, which is characterized in that in step 5, note
Cement slurry is injected before sinking under water into open caisson and groove, and keeps mud persistent loop in sinking watching.
9. soft soil area Self-sinking type steel open caisson method for protecting support as claimed in claim 6, which is characterized in that in step 9, sink
Examination pump drainage is carried out in well before slurries pump drainage, the deformation of steel open caisson and the periphery soil body is monitored during pump drainage closely, if heavy
Drop deformation is larger, continues to mend slurry reinforcement by outside steel pipe.
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| CN110805053A (en) * | 2019-11-05 | 2020-02-18 | 武汉市市政建设集团有限公司 | Construction method of deep foundation pit open caisson self-sinking supporting system |
| CN111677008A (en) * | 2020-06-02 | 2020-09-18 | 福州市恒坤建设发展有限公司 | Construction method of assembled underground garage |
| CN112482396A (en) * | 2020-12-01 | 2021-03-12 | 姜振波 | Mounting method of deep foundation pit assembled steel supporting structure |
| CN113235632A (en) * | 2021-04-14 | 2021-08-10 | 中铁二十四局集团有限公司 | Open caisson sinking device capable of automatically correcting deviation in real time and construction method |
| CN113373902A (en) * | 2021-06-17 | 2021-09-10 | 南京东土建设科技有限公司 | Grouting device suitable for soil solidification around stake of crowd under water |
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| CN113373902B (en) * | 2021-06-17 | 2022-05-31 | 南京东土建设科技有限公司 | Grouting device suitable for soil solidification around stake of crowd under water |
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