CN105274979A - Construction method for treating foundation of lower soil body through forming holes in existing structure - Google Patents
Construction method for treating foundation of lower soil body through forming holes in existing structure Download PDFInfo
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- CN105274979A CN105274979A CN201510657132.6A CN201510657132A CN105274979A CN 105274979 A CN105274979 A CN 105274979A CN 201510657132 A CN201510657132 A CN 201510657132A CN 105274979 A CN105274979 A CN 105274979A
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Abstract
The invention relates to a construction method for treating a foundation of a lower soil body through forming holes in an existing structure. The method includes the construction steps that firstly, the hole is formed in a top structural board; secondly, a concrete protective layer is chiseled out of the bottom of the structure and a sealing device is placed; thirdly, a casing pipe is installed; fourthly, the portion, above the top structural board, of the casing pipe is drilled downwards through a drilling machine; and fifthly, when the portion is drilled to the design depth, MJS construction is performed in the drilled hole. The construction method is used for treating a stratum and the foundation below large-section underground structures such as urban high-voltage cable utility tunnels and urban drainage structures. The beneficial effect that an MJS construction method has little influence on stratum settlement is used, through a hole forming measure, construction for improving the stratum below the structures is performed on the existing structure, the functions of the existing structure are not affected, huge capital input caused by pipeline or structure removal is avoided, and wider thoughts and pathways are provided for developing urban underground space under complex conditions.
Description
Technical field
The present invention relates to a kind of on existing structure perforate the bottom soil body is carried out to the construction method of basement process, especially the reinforcing below a kind of electric power to big cross section in Urban Underground Space Excavation, water supply and draining structure, do not affect structure function, again the method for good control settlement.
Background technology
At present, market is admitted substantially to MJS technique, and designing unit has started to promote gradually.According to country 13 planning, new infrastructure construction climax is all taken turns by starting one in the Yangtze River Delta, Pearl River Delta, Coastal Area in Tianjin, and the paces of national urbanization are also progressively accelerated, and the application of MJS engineering method also will get more and more.
MJS engineering method introduces China five years nearly, and construction application is more in Shanghai and nearby areas, and at present, domestic equipment is mainly distributed in the Yangtze River Delta and the southeastern coastal areas.The peculiar advantage of this technique, becomes the method that a Professional Characteristics in urban engineering construction is strong, can not be substituted, has domestically leading status.
MJS technique is large, little on surrounding enviroment impact owing to having a footpath, is widely used in adjacent line and the construction of architecture protection thing.Current urban pipeline gets more and more, particularly power pipeline, progressively by developing to underground on the ground.More reasonably arrange along with pipeline and plan, large-sized cable pipe trench also gets more and more, and which enhances safety and the durability of pipeline, facilitates and safeguards and maintenance.But this also makes the construction of leap large size electro solenoid ditch become a difficult problem.Pipeline moving costs is also increasing, and at some Special zone and main line position, pipeline changes in the label part short time and also do not have, and has a strong impact on the enforcement of engineering.Therefore, how carrying out intersecting the excavating water sealing consolidation of foundation ditch when not moving big cross section high voltage cable pipe trench, becoming a problem in the urgent need to address.How can either using underground space to greatest extent, well can protect existing building again, become a problem urgently to be resolved hurrily in underground construction.
Summary of the invention
The present invention will solve in Urban Underground Space Excavation process the difficult problem avoiding protecting existing building in newly-built underground space process, and provide a kind of on existing structure perforate the bottom soil body is carried out to the construction method of basement process.
For achieving the above object, technical scheme of the present invention is: a kind of on existing structure perforate the bottom soil body is carried out to the construction method of basement process, it is characterized in that, Specific construction step is:
(1) at existing structure openings in the ceiling;
(2) structural base cuts concrete cover and places sealing device;
(3) sleeve pipe is laid;
(4) crept into downwards in sleeve pipe by rig more than structure roof;
(5) drilling to completion, carries out MJS construction in boring.
Described before existing structure openings in the ceiling, select total powerstation to carry out accurate unwrapping wire according to design drawing, specific for perforate position is projected on common trench top board and base plate respectively, and the center both ensureing is on a vertical curve.
Described at existing structure openings in the ceiling concrete grammar: core drilling rig external diameter 237 × 6.5mm core tube drill bit, from the position perforate of ditch top board point, and take measures to prevent abolishing hard formation and directly fall in common trench.
The concrete grammar of described placement sealing device: external diameter 219 × 6.5mm steel pile casting is lowered into common trench base plate by the hole held successfully, need creep into 5cm at trench floor place embeds in base plate by steel pile casting, to reach better stagnant water effect, again steel pile casting is connected on flange by linkage members, be fixed on base plate by expansion bolt, then between flange and steel pile casting, rubber seal is put into, by setscrew, pressure is produced to rubber seal and make gap sealing herein, play the effect of waterproof, and in the gap of steel pile casting and common trench top board junction, by flange plate and rubber seal, setscrews etc. are sealed, the outside rapid water mud drum that uses is wrapped up in, in case Groundwater infiltration common trench after backfilling of earthwork.
After above-mentioned steps completes, hole is recovered, the steps include:
(1) top board, base plate tapping surface dabbing;
(2) twice water expandable waterstop is installed, and fixes with Ω type foundary weight, prevent sealing rod displacement in concreting process;
(3) build base plate and concrete roof, concrete adopts C35S8 microdilatancy pea gravel concreten;
(4) top board and base plate curing time are to the outer waterproof of top board of constructing afterwards and base plate inner waterproofing layer.
The invention has the beneficial effects as follows: present invention utilizes the advantage that MJS engineering method formation settlement influence is less, by perforate measure, existing structure carries out the construction that structure improves with sub-surface, do not affect the function of existing structure, avoid pipeline or structure to remove the huge fund input brought, for complex condition Urban Underground Space Excavation provides more wide thinking and approach.
Accompanying drawing explanation
Fig. 1 is casing protection device schematic diagram of the present invention;
Fig. 2 is the partial enlarged drawing at A place in Fig. 1.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As Fig. 1, shown in 2, a kind of on existing structure perforate the bottom soil body is carried out to the construction method of basement process, construction sequence is:
(1) at existing structure openings in the ceiling
Penetrate by carrying out boring on existing structure (such as high voltage supply integrated pipe canal, water supply and draining works, other works etc.), the following soil body of Construction on Structure carrying out MJS engineering method in the hole that brill leaves carries out basement process.
(2) structural base cuts concrete cover and places sealing device
Existing structure base plate is settled sealing blowout hookup.
(3) sleeve pipe 1 is laid
Utilize the arrangement of sleeve pipe 1, underground water is full of in sleeve pipe, in pipe, water level is communicated with underground water and rises, and guides to release groundwater pressure, the hidden danger of gushing that the water pressure of eliminating construction period causes.
(4) crept into downwards in sleeve pipe 1 by rig more than structure roof;
(5) drilling to completion, carries out MJS construction in boring
Utilize MJS engineering method and perforate in steps to carry out the bottom basement process of works, adopt sleeve pipe and blowout hookup to carry out auxiliary construction, the release solving expulsion pressure in underground water and construction in work progress causes the difficult problem to structure influence.
Of the present invention on existing structure perforate the bottom soil body is carried out to the construction method concrete grammar of basement process:
(1) before existing structure openings in the ceiling, select total powerstation to carry out accurate unwrapping wire according to design drawing, specific position is projected on common trench top board and base plate respectively.The center of both guarantees is on a vertical curve.
(2) at existing structure openings in the ceiling concrete grammar: core drilling rig external diameter 237 × 6.5mm core tube drill bit, from the position perforate of top board point, take measures to prevent abolishing hard formation and directly fall in common trench, and send special messenger to observe in common trench.
(3) the external diameter 219 × 6.5mm steel pile casting 2 purchased is lowered into common trench base plate by the hole held successfully, 5cm need be crept at trench floor place and steel pile casting 2 be embedded in trench floor, to reach better stagnant water effect.Steel pile casting 2 is connected on flange 3 by linkage members, is fixed on trench floor by expansion bolt.Between flange 3 and steel pile casting 2, put into rubber seal 4, by setscrew, pressure is produced to rubber seal and make gap sealing herein, play the effect of waterproof.
(4) in the gap of steel pile casting and common top board junction, sealed by flange plate and sealing ring, setscrew etc., the outside rapid water mud drum that uses is wrapped up in, in case Groundwater infiltration common trench after backfilling of earthwork.
(5) after completing above-mentioned steps, hole recovers
1) top board, base plate tapping surface dabbing.
2) twice water expandable waterstop is installed, and fixes with Ω type foundary weight, prevent sealing rod displacement in concreting process.
3) build base plate and concrete roof, concrete adopts C35S8 microdilatancy pea gravel concreten.
4) top board and base plate curing time are to the outer waterproof of top board of constructing afterwards and base plate inner waterproofing layer.
Claims (5)
1. on existing structure, a construction method for basement process is carried out in perforate to the bottom soil body, it is characterized in that, Specific construction step is:
(1) at existing structure openings in the ceiling;
(2) structural base cuts concrete cover and places sealing device;
(3) sleeve pipe is laid;
(4) crept into downwards in sleeve pipe by rig more than structure roof;
(5) drilling to completion, carries out MJS construction in boring.
2. according to claim 1 on existing structure perforate the bottom soil body is carried out to the construction method of basement process, it is characterized in that: described before existing structure openings in the ceiling, total powerstation is selected to carry out accurate unwrapping wire according to design drawing, specific for perforate position is projected on common trench top board and base plate respectively, and the center both ensureing is on a vertical curve.
3. according to claim 1 on existing structure perforate the bottom soil body is carried out to the construction method of basement process, it is characterized in that: described at existing structure openings in the ceiling concrete grammar: core drilling rig external diameter 237 × 6.5mm core tube drill bit, from the position perforate of ditch top board point, and take measures to prevent abolishing hard formation and directly fall in common trench.
4. according to claim 1 on existing structure perforate the bottom soil body is carried out to the construction method of basement process, it is characterized in that: the concrete grammar of described placement sealing device: external diameter 219 × 6.5mm steel pile casting is lowered into common trench base plate by the hole held successfully, need creep into 5cm at trench floor place embeds in trench floor by steel pile casting, to reach better stagnant water effect, again steel pile casting is connected on flange by linkage members, be fixed on base plate by expansion bolt, then between flange and steel pile casting, rubber seal is put into, by setscrew, pressure is produced to rubber seal and make gap sealing herein, play the effect of waterproof, and in the gap of steel pile casting and common top board junction, by flange plate and rubber seal, setscrews etc. are sealed, the outside rapid water mud drum that uses is wrapped up in, in case Groundwater infiltration common trench after backfilling of earthwork.
5. according to claim 1 on existing structure perforate the bottom soil body is carried out to the construction method of basement process, it is characterized in that: after above-mentioned steps completes, hole recovered, the steps include:
(1) top board, base plate tapping surface dabbing;
(2) twice water expandable waterstop is installed, and fixes with Ω type foundary weight, prevent sealing rod displacement in concreting process;
(3) build base plate and concrete roof, concrete adopts C35S8 microdilatancy pea gravel concreten;
(4) top board and base plate curing time are to the outer waterproof of top board of constructing afterwards and base plate inner waterproofing layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657132.6A CN105274979A (en) | 2015-10-12 | 2015-10-12 | Construction method for treating foundation of lower soil body through forming holes in existing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657132.6A CN105274979A (en) | 2015-10-12 | 2015-10-12 | Construction method for treating foundation of lower soil body through forming holes in existing structure |
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| CN105274979A true CN105274979A (en) | 2016-01-27 |
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| CN201510657132.6A Pending CN105274979A (en) | 2015-10-12 | 2015-10-12 | Construction method for treating foundation of lower soil body through forming holes in existing structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109440763A (en) * | 2018-12-19 | 2019-03-08 | 上海市基础工程集团有限公司 | Bored pile construction method below existing building |
| CN109667294A (en) * | 2017-10-17 | 2019-04-23 | 上海宝冶集团有限公司 | The casing gushed on anti-underground water in basement bored pile construction and pile-driving method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131000A (en) * | 2006-08-23 | 2008-02-27 | 天津市森宇建筑技术法律咨询有限公司 | Construction method for controlling differential settlement of buildings |
| CN102758443A (en) * | 2012-07-25 | 2012-10-31 | 上海隧道工程股份有限公司 | Novel enclosing structure applicable to connection change between new pipes and old pipes and construction method thereof |
| CN102758458A (en) * | 2012-07-30 | 2012-10-31 | 上海隧道工程股份有限公司 | Underground continuous wall repairing method |
| CN103966997A (en) * | 2014-04-25 | 2014-08-06 | 上海岩土工程勘察设计研究院有限公司 | Construction method for conducting foundation treatment through grouting engineering pile foundations with steel sleeves |
-
2015
- 2015-10-12 CN CN201510657132.6A patent/CN105274979A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131000A (en) * | 2006-08-23 | 2008-02-27 | 天津市森宇建筑技术法律咨询有限公司 | Construction method for controlling differential settlement of buildings |
| CN102758443A (en) * | 2012-07-25 | 2012-10-31 | 上海隧道工程股份有限公司 | Novel enclosing structure applicable to connection change between new pipes and old pipes and construction method thereof |
| CN102758458A (en) * | 2012-07-30 | 2012-10-31 | 上海隧道工程股份有限公司 | Underground continuous wall repairing method |
| CN103966997A (en) * | 2014-04-25 | 2014-08-06 | 上海岩土工程勘察设计研究院有限公司 | Construction method for conducting foundation treatment through grouting engineering pile foundations with steel sleeves |
Non-Patent Citations (1)
| Title |
|---|
| 王会锋: "利用MJS工法穿过大断面共同沟加固地基施工技术", 《上海建设科技》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109667294A (en) * | 2017-10-17 | 2019-04-23 | 上海宝冶集团有限公司 | The casing gushed on anti-underground water in basement bored pile construction and pile-driving method |
| CN109440763A (en) * | 2018-12-19 | 2019-03-08 | 上海市基础工程集团有限公司 | Bored pile construction method below existing building |
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Application publication date: 20160127 |