CN110055991A - A kind of two-wall hollow well foundation and its sinking construction method - Google Patents
A kind of two-wall hollow well foundation and its sinking construction method Download PDFInfo
- Publication number
- CN110055991A CN110055991A CN201910460232.8A CN201910460232A CN110055991A CN 110055991 A CN110055991 A CN 110055991A CN 201910460232 A CN201910460232 A CN 201910460232A CN 110055991 A CN110055991 A CN 110055991A
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- China
- Prior art keywords
- pit shaft
- wall
- sinking
- mud equipment
- footing
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- Pending
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- 238000010276 construction Methods 0.000 title claims abstract description 30
- 239000002689 soil Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002513 implantation Methods 0.000 claims description 3
- 230000003020 moisturizing effect Effects 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 230000005484 gravity Effects 0.000 abstract description 3
- 210000002683 foot Anatomy 0.000 description 19
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
Classifications
-
- 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 two-wall hollow well foundation and its sinking construction methods, it is characterized in that being made of the two-wall hollow pit shaft with toroidal cavity shaft in wall and pit shaft outer wall, suction mud equipment is set to transfer by the toroidal cavity, and arrive at the suction head for inhaling mud equipment at the footing of pit shaft, the footing of pit shaft is blade foot, and blade foot is that the domain is arranged on the inner sidewall of pit shaft footing；During well-sinking, using mud equipment open caisson is inhaled because inside and outside, lateral earth pressure keeps balance, precisely sink along the vertical direction；It is influenced by blade foot lower cavity, the soil body sink in the continuous avalanche of gravity, vertically inside open caisson, negative friction straight down is formed to the borehole wall, increase vertical force when well sinking, simple process, construction are convenient, it realizes that fast accurate sinks, improves the efficiency of caisson sinking construction, the open caisson construction suitable for land and water.
Description
Technical field
The present invention relates to applying in one of the engineerings such as bridge, Fang Jian, municipal administration, mine, water conservancy and ocean open caisson and its
Sinking construction method.
Background technique
Open caisson is to be made on the ground, and upper lower open mouth is in hollow well tubular, and blade foot is arranged at bottom, by removing underground and well
The soil body in bucket, helps heavy measure to be allowed to heavy by being self-possessed or being equipped with, and reaches the depth of underground setting, becomes underground structure,
It is widely used in the engineerings such as bridge, Fang Jian, municipal administration, mine, water conservancy and ocean.
Caisson sinking construction requires structure safety, sinks smoothly, and prevents deflection.Pit shaft is not only wanted in sinking watching
Overcome the frontal drag from blade foot, also to overcome the frictional resistance between borehole wall face and the soil body.With the increasing of well sinking depth
Add, borehole wall face frictional resistance can continue to increase, and make and restrict the principal element that open caisson smoothly sinks.
In order to make open caisson smoothly sink, two major classes measure can be substantially taken, one kind is vertical force when increasing well sinking,
Such as using measures such as gravity type open caisson, preloading exacerbation, back-pressure, vertical excitings；Another kind of be obstructed when reducing well sinking
Power will especially reduce borehole wall face frictional resistance.
To reduce borehole wall face frictional resistance, whether traditional method is by removing in pit shaft the soil body come there are mainly two types of dividing:
The soil body in pit shaft is removed when the first is well sinking, to eliminate shaft in wall face frictional resistance, while in pit shaft
Draft reduction material or measure is arranged to reduce pit shaft outside wall surface frictional resistance, as thixotropic slurry, air curtain, cobble, the borehole wall apply in outer wall
Smear the methods of lubricant and the outer jetting of the borehole wall.
Second is the soil body in pit shaft not to be removed in open caisson outer wall setting step, sinking, in the borehole wall using method of center island
Groover is arranged in inside, and side grooving (groove width is generally 60cm) marginal not enters slurry coat method, so that pit shaft medial and lateral borehole wall face Jun Chu
In mud off slot, open caisson under Gravitative Loads (or being aided with the measures such as preloading, back-pressure) sinks.Well sinking in place after, will
Mud is replaced and is solidified on the outside of the borehole wall, while reinforcing to ground at blade foot inclined-plane, to support open caisson self weight.Then excavate
The interior soil body, the back cover of open caisson complete construction.
Above-mentioned first method be the most common method for sinking of open caisson, but to open caisson surrounding soil, level of ground water disturbance compared with
Greatly, it pays particular attention to prevent when sinking to gush sand caused by open caisson internal and external reasons pressure difference is excessive and emits mud phenomenon, be easy to appear open caisson
A wide range of deflection stops sinking, dash forward heavy the problems such as even pit shaft is broken, and causes construction delay, cost increases；Above-mentioned second method
In, the soil body prevents the soil body outside open caisson to pour in well in open caisson, avoids gushing sand and emits the generation of mud phenomenon, while limiting open caisson and going out
Now a wide range of deflection, it is smaller to surrounding soil, level of ground water disturbance, it is suitable for the higher feelings of basal perimeter soil body settlement request
Under condition.But this method uses dedicated groover, and high equipment cost, size are big, are not suitable for small-sized open caisson；Use is needed to face when grooving
When mud off, there are mud displacement after slurrying, recovery processing, wall and the problems such as potential risk of environmental pollution, material
Material consumes more, higher cost, and is not used to over-water construction.
Summary of the invention
The present invention be to avoid above-mentioned deficiency of the prior art, provide a kind of two-wall hollow well foundation and its under
Sinking construction method removes the local soil body below blade foot by orientation, keeps open caisson two sides earth pressure balance, increases well sinking
When vertical force, realize that open caisson is accurate, continuous and quick sinking with the mode of economical rationality, to improve the construction effect of well sinking
Rate.
The present invention is to solve the problems, such as to adopt the following technical scheme that
The characteristics of two-wall hollow well foundation of the present invention, is: being made of shaft in wall and pit shaft outer wall with toroidal cavity
Two-wall hollow pit shaft enables suction mud equipment to transfer by the toroidal cavity, and the suction head for inhaling mud equipment is made to arrive at pit shaft
Footing at, the footing of the pit shaft is blade foot, and the blade foot is that the domain is arranged on the inner sidewall of pit shaft footing.
The characteristics of two-wall hollow well foundation of the present invention, lies also in: the pit shaft be vertically be hinged with by each segment cylinder and
At the bottom segment of pit shaft is the initial segment, and rib wall is arranged between the shaft in wall and pit shaft outer wall, and pit shaft is enable to add
Gu；Toroidal cavity is gone out into each vertical passageway along its circumferential even partition using the rib wall, the suction mud equipment is described perpendicular
The lower section into channel, and arrive at the suction head for inhaling mud equipment at the footing of pit shaft.
The characteristics of sinking construction method of two-wall hollow well foundation of the present invention is to carry out as follows:
Step 1, the bottom segment for making pit shaft make the pit shaft starting segment heightening and sinking and stablize implantation, in each road
Mud equipment is inhaled in decentralization in vertical passageway；
Step 2 when the base opening position of arrival pit shaft starting segment, utilizes below the suction head for inhaling mud equipment and inhales mud equipment
Orientation removes the local soil body below blade foot, and forms cavity below the blade foot in annular section, eliminates the front of the blade foot soil body
Resistance, open caisson are sunk using self weight；
Step 3: when well sinking in place when, after continued access height, and continue decentralization inhale mud equipment；
Step 4: circulation step 2 and step 3, up to pit shaft integral sinking to target position；
Step 5: removing the soil body inside open caisson, pour bottom concrete, complete construction.
The characteristics of sinking construction method of two-wall hollow well foundation of the present invention, lies also in: auxiliary when encountering sinking and being obstructed
Heavy measure auxiliary well-sinking is helped with outside water jetting at high pressure in the borehole wall or air curtain.
The characteristics of sinking construction method of two-wall hollow well foundation of the present invention, lies also in: take preloading, strong rammer, impulse or
The ancillary measure of big gun shake makes the soil body in pit shaft accelerate avalanche and sink.
The characteristics of sinking construction method of two-wall hollow well foundation of the present invention, lies also in: during well-sinking, to
Timely moisturizing in toroidal cavity guarantees that the depth of water in toroidal cavity meets and inhales the requirement that mud equipment works normally.
Compared with the prior art, the invention has the advantages that:
1, it is two-wall hollow structure that the present invention, which improves pit shaft, and places in two-wall hollow structure and inhale mud equipment, and orientation is removed
The local soil body below blade foot is removed, open caisson two sides earth pressure balance is kept, increases vertical force when well sinking, uses economical rationality
Mode realize open caisson precisely, it is continuous, quickly sink, effectively increase the construction efficiency of well sinking.
2, the method for the present invention is pollution-free, disturbs smaller, simple process to surrounding soil, level of ground water, it is convenient to construct, and is applicable in
The open caisson construction in land and water.
Detailed description of the invention
Fig. 1 is that two-wall hollow well foundation of the present invention orientation takes soil and accurate balancing sinking schematic diagram；
Fig. 2 is that two-wall hollow well foundation is used cooperatively suction mud device structure schematic diagram in the present invention；
Fig. 3 is that two-wall hollow well foundation is used cooperatively the distribution schematic diagram for inhaling mud equipment in the present invention；
Figure label: 1 outer wall, 2 inner walls, 3 rib walls, 4 inhale mud equipment, 4a suction head, 5 vertical passageways, 6 blade foots, under 7 blade foots
Square cavity, the soil body inside 8 pit shafts, the soil body on the outside of 9 pit shafts.
Specific embodiment
Referring to figure 1, figure 2 and figure 3, two-wall hollow well foundation is by 1 structure of shaft in wall 2 and pit shaft outer wall in the present embodiment
At the two-wall hollow pit shaft with toroidal cavity, suction mud equipment 4 is enable to transfer by toroidal cavity, and makes to inhale mud equipment 4
Suction head 4a is arrived at the footing of pit shaft, and the footing of pit shaft is blade foot 6, and blade foot 6 is that the domain is set on the inner sidewall of pit shaft footing
It sets.
In specific implementation, pit shaft is vertically hinged with by each segment cylinder, and the bottom segment of pit shaft is the initial segment,
Rib wall 3 is set between shaft in wall 2 and pit shaft outer wall 1, pit shaft is enable to reinforce；Using rib wall 3 by toroidal cavity along its circumferential direction
Even partition goes out each vertical passageway 5, and in the wellbore up and down, inhaling mud equipment 4 is the lower section in vertical passageway 5 for vertical passageway 5,
And arrive at the suction head 4a for inhaling mud equipment 4 at the footing of pit shaft.
The sinking construction method of two-wall hollow well foundation is to carry out as follows in the present embodiment:
Step 1, the bottom segment for making pit shaft make pit shaft starting segment heightening and sinking and stablize implantation, vertical in each road
Mud equipment 4 is inhaled in decentralization in channel 5；
Step 2 when the base opening position of arrival pit shaft starting segment, utilizes below the suction head 4a for inhaling mud equipment 4 and inhales mud
The orientation of equipment 4 removes the local soil body of the lower section of blade foot 6, and forms blade foot lower cavity 7 in annular section below the blade foot 6, disappears
Except soil body frontal drag suffered by blade foot 6, pit shaft is sunk using self weight；
Step 3: when well-sinking in place when, after continued access height, and continue decentralization inhale mud equipment；
Step 4: circulation step 2 and step 3, up to pit shaft integral sinking to target position；
Step 5: removing the soil body inside open caisson, pour bottom concrete, complete construction.
During well-sinking, the timely moisturizing into toroidal cavity is needed, guarantees that the depth of water in toroidal cavity meets and inhales
The requirement that mud equipment 4 works normally；If encountering sinking to be obstructed, be aided with outside water jetting at high pressure in the borehole wall or air curtain helps heavy measure
Assist well-sinking；Can also be taken in pit shaft preloading, strong rammer, impulse or big gun shake ancillary measure, add the soil body in pit shaft
It fast avalanche and sink, accelerates construction progress, improve construction efficiency.
For construction method of the present invention during well-sinking, the soil body 8 prevents the soil body 9 outside pit shaft to enter well inside pit shaft
It is interior, it effectively prevents gushing the generation that sand emits mud phenomenon；Due to gapless between pit shaft and surrounding soil, two sides earth pressure balance has
Effect limits pit shaft and occurs lateral displacement and inclination in sinking watching, forces open caisson vertically automatic guide, precisely sinking；Its
The presence of annular section internal cavity below blade foot makes the soil body inside pit shaft act on continuous avalanche under gravity, vertically sink, collapses
The process collapsed and sunk exactly forms negative friction straight down to the borehole wall, and perpendicular when thereby increasing well-sinking
Xiang Li, greatly quickening subsidence velocity, significant effect.
The method of the present invention is suitable for cast-in-place open caisson, is also applied for prefabricated assembled open caisson, and the flat shape of open caisson can be with
For round, ellipse, rectangle or nose circle shape.
Claims (6)
1. two-wall hollow well foundation, it is characterized in that: being made of shaft in wall (2) and pit shaft outer wall (1) with toroidal cavity
Two-wall hollow pit shaft transfer suction mud equipment (4) can by the toroidal cavity, and make the suction head for inhaling mud equipment (4)
(4a) is arrived at the footing of pit shaft, and the footing of the pit shaft is blade foot, and the blade foot is the domain on the inner sidewall of pit shaft footing
Setting.
2. two-wall hollow well foundation according to claim 1, it is characterized in that: the pit shaft is by each segment cylinder vertical
On be hinged with, the bottom segment of pit shaft is the initial segment, the setting rib wall between the shaft in wall (2) and pit shaft outer wall (1)
(3), pit shaft is enable to reinforce；Toroidal cavity is gone out into each vertical passageway along its circumferential even partition using the rib wall (3), it is described
Inhaling mud equipment is the lower section in the vertical passageway, and arrives at the suction head for inhaling mud equipment (4) at the footing of pit shaft.
3. the sinking construction method of two-wall hollow well foundation described in a kind of claim 2, it is characterized in that carrying out as follows:
Step 1, the bottom segment for making pit shaft make the pit shaft starting segment heightening and sinking and stablize implantation, vertical in each road
Mud equipment (4) are inhaled in decentralization in channel；
Step 2 when the base opening position of arrival pit shaft starting segment, utilizes below the suction head for inhaling mud equipment (4) and inhales mud equipment
(4) orientation removes the local soil body below blade foot, and forms cavity (6) in annular section below the blade foot, eliminates the blade foot soil body
Frontal drag, open caisson using self weight sink；
Step 3: when well sinking in place when, after continued access height, and continue decentralization inhale mud equipment；
Step 4: circulation step 2 and step 3, up to pit shaft integral sinking to target position；
Step 5: removing the soil body inside open caisson, pour bottom concrete, complete construction.
4. the sinking construction method of two-wall hollow well foundation according to claim 3, it is characterized in that: encounter by
When resistance, be aided with outside water jetting at high pressure in the borehole wall or air curtain helps heavy measure auxiliary well-sinking.
5. the sinking construction method of two-wall hollow well foundation according to claim 3, it is characterized in that: taking preloading, strong
It rams, impulse or the ancillary measure of big gun shake makes in pit shaft the soil body accelerate avalanche and sink.
6. the sinking construction method of two-wall hollow well foundation according to claim 3, it is characterized in that: in well-sinking mistake
Cheng Zhong, the timely moisturizing into toroidal cavity guarantee that the depth of water in toroidal cavity meets and inhale the requirement that mud equipment (4) work normally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910460232.8A CN110055991A (en) | 2019-05-30 | 2019-05-30 | A kind of two-wall hollow well foundation and its sinking construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910460232.8A CN110055991A (en) | 2019-05-30 | 2019-05-30 | A kind of two-wall hollow well foundation and its sinking construction method |
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| Publication Number | Publication Date |
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| CN110055991A true CN110055991A (en) | 2019-07-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110792094A (en) * | 2019-10-18 | 2020-02-14 | 中交二航局第四工程有限公司 | Air curtain air niche structure for assisting sinking of steel open caisson |
| CN111119212A (en) * | 2019-12-18 | 2020-05-08 | 中建三局基础设施建设投资有限公司 | Construction method for sinking double-wall steel cofferdam under deep clay layer condition |
| CN111441376A (en) * | 2020-04-03 | 2020-07-24 | 中交第四航务工程勘察设计院有限公司 | Round caisson with balance mechanism and use method |
| CN113174988A (en) * | 2021-04-30 | 2021-07-27 | 中国化学工程第十三建设有限公司 | Double-wall concrete open caisson structure and construction method |
| CN115030206A (en) * | 2022-06-24 | 2022-09-09 | 武汉理工大学 | Open caisson construction method |
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| CN210086275U (en) * | 2019-05-30 | 2020-02-18 | 安徽省交通控股集团有限公司 | Double-wall hollow open caisson foundation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111119212A (en) * | 2019-12-18 | 2020-05-08 | 中建三局基础设施建设投资有限公司 | Construction method for sinking double-wall steel cofferdam under deep clay layer condition |
| CN111441376A (en) * | 2020-04-03 | 2020-07-24 | 中交第四航务工程勘察设计院有限公司 | Round caisson with balance mechanism and use method |
| CN113174988A (en) * | 2021-04-30 | 2021-07-27 | 中国化学工程第十三建设有限公司 | Double-wall concrete open caisson structure and construction method |
| CN115030206A (en) * | 2022-06-24 | 2022-09-09 | 武汉理工大学 | Open caisson construction method |
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