CN109208628B - Construction method for soft soil cast-in-situ concrete foundation - Google Patents
Construction method for soft soil cast-in-situ concrete foundation Download PDFInfo
- Publication number
- CN109208628B CN109208628B CN201811305749.1A CN201811305749A CN109208628B CN 109208628 B CN109208628 B CN 109208628B CN 201811305749 A CN201811305749 A CN 201811305749A CN 109208628 B CN109208628 B CN 109208628B
- Authority
- CN
- China
- Prior art keywords
- shaped steel
- pile
- steel pile
- concrete
- foundation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
Abstract
The invention belongs to engineering construction foundations, and particularly relates to a soft soil cast-in-place concrete foundation which comprises a plurality of H-shaped steel piles, a plurality of reinforcing steel bars and a concrete foundation layer which are vertically arranged, wherein a concrete block is arranged above each H-shaped steel pile, and the length of the upper surface of each H-shaped steel pile, which is exposed out of the concrete block, is 800-1500 mm; the reinforcing steel bars are laid on the concrete blocks, each H-shaped steel pile is correspondingly bound with the reinforcing steel bars, and the concrete foundation layer is upwards poured by taking the reinforcing steel bars as the foundation. The invention also relates to a construction method for the soft soil cast-in-place concrete foundation, which solves the technical problem of insufficient bearing capacity of swamp and soft soil foundation, and is different from the conventional concrete pile foundation, and the construction method comprising cast-in-situ bored piles, precast piles and the like which need large-scale construction equipment. The amazon tropical rainforest region has multiple mountainous regions and marshes, the environmental requirement is strict, the requirement of large-scale equipment for entering and leaving cannot be met, the method does not need large-scale equipment, and the pile foundation construction method and the test are simple.
Description
Technical Field
The invention relates to an engineering construction foundation, in particular to a soft soil cast-in-place concrete foundation and a construction method.
Background
At present, the forms of the power transmission line self-supporting tower foundations in tropical rainforest areas include excavation type foundations, large plate type foundations and the like, and the forms suitable for the power transmission line and the power transmission line can be summarized into common concrete foundation forms and construction methods.
The prior art solves the construction requirement of the self-supporting tower foundation, but can not meet the requirement of the bearing capacity of the foundation aiming at the marsh and weak soil areas in tropical rainforest areas. For example, in the case of an excavation-type foundation, groundwater is present at a tower position of 2 to 3 m during excavation, which sometimes results in failure of drilling. The excavation and backfilling volume of the large-plate foundation is large, and the damage to the environment is large. In addition, the foundation has relatively high requirement on the bearing capacity of the foundation, and the weak soil areas such as swamp and rubber soil cannot be used.
Disclosure of Invention
In order to solve the problems, the invention provides a construction method which takes an H-shaped steel pile as a main stressed pile foundation and makes use of the H-shaped steel pile as the pile foundation to meet the requirements of a weak soil area and a swamp area. The pile foundation is driven into the underground bearing layer by a professional piling machine, and the upper cast-in-place concrete block is used as a self-supporting tower foundation, so that the problem that the bearing capacity of the self-supporting tower foundation cannot be met by marsh and weak soil is solved.
The technical scheme adopted by the invention is as follows:
a cast-in-place concrete foundation for weak soil comprises a plurality of H-shaped steel piles, a plurality of reinforcing steel bars and a concrete foundation layer which are vertically arranged, wherein a concrete block is arranged above each H-shaped steel pile, and the length of the upper surface of each H-shaped steel pile, which is exposed out of the concrete block, is 800-1500 mm; the reinforcing steel bars are laid on the concrete blocks, each H-shaped steel pile is correspondingly bound with the reinforcing steel bars, and the concrete foundation layer is upwards poured by taking the reinforcing steel bars as the foundation.
According to the cast-in-place concrete foundation, the thickness of the concrete foundation layer is 1.8-2.5 times of the length of the upper surface of the concrete block exposed out of the H-shaped steel pile.
According to the cast-in-place concrete foundation, the concrete blocks are cubes, and the side length of each concrete block is 1.5-2.2 times of the height of the web plate of the H-shaped steel pile.
The construction method for the weak soil cast-in-situ concrete foundation comprises the following steps:
s1, calculating the number and the type of the H-shaped steel piles required by each foundation of the self-standing tower according to the bearing capacity required by different tower positions as a foundation requirement;
s2, performing sand blasting corrosion prevention on the surface of the H-shaped steel, and standing for at least 2 hours;
s3, placing the H-shaped steel piles in a guide frame by using a lifter, placing pile lines, and using a crawler-type hydraulic excavator and a hydraulic hammer of a vibration hammer to beat the H-shaped steel piles one by one; measuring and monitoring the inclination of each H-shaped steel pile at any time, and correcting in a drawing and aligning mode to ensure that the inclination does not exceed 2%; when the inclination is too large and cannot be adjusted by a pulling-aligning method, pulling and striking again;
when the allowance of the H-shaped steel which is not driven in is 1 m, carrying out butt welding on the H-shaped steel, cooling for at least 5min after welding, cleaning welding beading, welding slag and splashes at a welding opening, then coating a layer of epoxy resin coating on the welding opening, standing for at least 2 hours, and then continuously driving in;
performing a knocking test on the H-shaped steel pile after the H-shaped steel pile is driven to the construction depth, and determining that the H-shaped steel pile is qualified if the descending size of the H-shaped steel pile is smaller than a certain value; repeating the steps until all H-shaped steel piles are paved;
s4, excavating a stratum, cutting or welding the H-shaped steel piles to reach the required height for construction, correspondingly installing concrete blocks on each H-shaped steel pile, paving reinforcing steel bars, and correspondingly binding each H-shaped steel pile on the reinforcing steel bars by binding wires;
and S5, pouring a concrete foundation layer.
The sand blasting anticorrosion process in the step S2 comprises the following steps:
s21, performing sand blasting and rust removing by conforming to the length of the H-shaped steel pile and using an S-shaped route during sand blasting to ensure that rust removing is completely omitted;
s22, and then painting an anticorrosive paint within 8 hours: and reserving lengths of 220-300 mm at two ends of the H-shaped steel pile respectively without painting, painting by taking epoxy zinc-rich as a primer, adopting epoxy micaceous iron intermediate paint as intermediate paint, and adopting acrylic polyurethane paint as finish paint.
The invention has the beneficial effects that:
1. the invention solves the technical problem of insufficient bearing capacity of the marsh and soft soil foundation, and is different from the conventional concrete pile foundation, and the method comprising the cast-in-situ bored pile and the precast pile and the like needs large-scale construction equipment. The amazon tropical rainforest region has multiple mountainous regions and marshes, the environmental requirement is strict, the requirement of large-scale equipment for entering and leaving cannot be met, the method does not need large-scale equipment, and the pile foundation construction method and the test are simple.
2. The method is suitable for long-distance variable transmission line engineering, the construction equipment is simple to disassemble and assemble, the raw material quantity is convenient to transport, and the method can adapt to the construction properties of multiple and wide construction points and frequent transition of power transmission and transformation.
3. The invention has the construction characteristics of small excavation engineering quantity and small concrete pouring volume, reduces the concrete pouring volume and is suitable for amazon area construction.
Drawings
FIG. 1 is a schematic sectional view of an H-shaped steel pile and a concrete foundation according to an embodiment of the invention;
FIG. 2 is a schematic view of a welding structure between H-shaped steel piles according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of H-shaped steel pile binding in the embodiment of the invention.
In the figure: 1 is an H-shaped steel pile, 2 is a concrete block, 3 is a concrete foundation layer, 4 is a reinforcing steel bar and 5 is a binding wire.
Detailed Description
The invention is further explained below with reference to the drawings.
The H-shaped steel pile 1 is also called a wide-flange H-shaped steel pile 1, HW HM HN is from European standards, and HEB is the H-shaped steel pile 1 of Germany standards. The HW and HNH steel piles 1 are widely used and produced in China. HEA HEB HEM is seen in many German design drawings and is also very difficult to purchase in the market. Considering that the construction is in the amazon tropical rainforest area, the steel piles driven into the ground need to be in the underground humid environment for a long time.
The embodiment is a cast-in-place concrete foundation for weak soil, which comprises a plurality of H-shaped steel piles 1, a plurality of reinforcing steel bars 4 and a concrete foundation layer 3 which are vertically arranged, wherein a concrete block 2 is arranged above each H-shaped steel pile 1, and the length of the upper surface of each H-shaped steel pile 1 exposed out of the concrete block 2 is 800-1500 mm; the reinforcing steel bars 4 are laid on the concrete blocks 2, each H-shaped steel pile 1 is correspondingly bound with the reinforcing steel bars 4, and the concrete foundation layer 3 is upwards poured by taking the reinforcing steel bars 4 as the foundation.
The thickness of the concrete foundation layer 3 is 1.8-2.5 times of the length of the upper surface of the H-shaped steel pile 1 exposed out of the concrete block 2. The concrete block 2 is a cube, and the side length of the cube is 1.5-2.2 times of the height of the web plate of the H-shaped steel pile 1.
The self-supporting tower is mostly located in a forest area, so that the transportation of the H-shaped steel pile 1 is guaranteed, forest logging and road repairing work are needed at first, and the follow-up concrete pump truck can be guaranteed to enter smoothly.
Before construction, the following steps are required: considering that the H-shaped steel pile 1 is long, the H-shaped steel pile 1 is easy to incline to one side during driving, and the straightness of the H-shaped steel pile 1 is difficult to control due to the fact that the inclination error accumulation is difficult to correct, so that the H-shaped steel pile 1 is mainly driven one by one during construction. The H-shaped steel pile 1 can be ensured not to be bent, twisted or inclined by the one-by-one driving method, and the driving precision is high. In order to ensure the sinking verticality of the H-shaped steel pile 1 and the flatness of the H-shaped steel pile 1, the driving precision needs to be controlled, the buckling deformation is prevented, the penetration capacity is improved, and a total station and a level gauge are adopted to control and adjust the position of the guide beam. The height of the guide beam needs to be proper, and the construction height of the H-shaped steel pile 1 needs to be controlled and the construction efficiency needs to be improved. The guide beam cannot sink and deform with the installation of the H-shaped steel pile 1.
The concrete construction steps are as follows:
s1, calculating the number and the type of the H-shaped steel piles 1 required by each foundation of the self-standing tower according to the bearing capacity required by different tower positions as the foundation requirement;
s2, performing sand blasting corrosion prevention on the surface of the H-shaped steel, and standing for at least 2 hours;
s3, the H-shaped steel pile 1 is required to be familiar with the field situation before being driven by a pile driver. And accurately finding out the center of the tower position through a total station, positioning four corners according to a drawing, and releasing an accurate pile position line. Placing the H-shaped steel piles 1 in a guide frame by using a lifter, and driving the H-shaped steel piles 1 one by using a crawler-type hydraulic excavator and a hydraulic hammer of a vibration hammer; measuring and monitoring the inclination of each H-shaped steel pile 1 at any time, and correcting in a drawing and aligning mode to ensure that the inclination does not exceed 2%; when the inclination is too large and cannot be adjusted by a pulling-aligning method, pulling and striking again;
when the allowance of the H-shaped steel which is not driven in is 1 m, carrying out butt welding on the H-shaped steel, cooling for at least 5min after welding, cleaning welding beading, welding slag and splashes at a welding opening, then coating a layer of epoxy resin coating on the welding opening, standing for at least 2 hours, and then continuously driving in;
performing a knocking test on the H-shaped steel pile 1 after the H-shaped steel pile 1 is driven to the construction depth, and determining that the H-shaped steel pile 1 is qualified if the descending size of the H-shaped steel pile 1 is smaller than a certain value; repeating the steps until all the H-shaped steel piles 1 are paved;
the test method in step S3 is to lift the weight by a certain height and then strike the weight, and the falling size after 10 strikes is smaller than the value shown in the following table, which is qualified as follows:
table 1 test requirements for H-shaped steel piles 1
| Weight of weight (T) | Height of lift (m) | Size reduction (cm) with 10 strokes |
| 1.60 | 1.0 | 2.34 |
| 2.15 | 1.0 | 5.44 |
| 3.50 | 0.5 | 3.52 |
| 2.90 | 0.5 | 1.81 |
| 4.00 | 0.5 | 4.96 |
| 3.30 | 0.5 | 2.95 |
S4, if the H-shaped steel pile 1 is installed after excavation, collapse can be caused, and excavation can be carried out only after the H-shaped steel pile 1 is installed. And after the excavation is finished, cutting and welding the H-shaped steel pile 1 according to the requirements of design paper, wherein the length of the H-shaped steel pile 1 extending into the concrete foundation is mainly used, and the H-shaped steel pile is effectively bound with the reinforcing steel bars 4 by using binding wires 5, as shown in figure 2.
And S5, pouring the concrete foundation layer 3.
The sand blasting anticorrosion process in the step S2 comprises the following steps:
s21, performing sand blasting and rust removing in an S-shaped route according to the length of the H-shaped steel pile 1 during sand blasting, and ensuring that rust removing is completely omitted;
s22, and then painting an anticorrosive paint within 8 hours: the method comprises the steps of reserving lengths of 220-300 mm at two ends of an H-shaped steel pile 1 respectively without painting, painting with epoxy zinc-rich paint serving as a primer, painting with epoxy micaceous iron intermediate paint serving as intermediate paint, and painting with acrylic polyurethane paint serving as finish paint.
In the step S3, the butt welding is groove butt welding or fillet welding of a connecting plate, and any one of carbon dioxide gas shielded automatic welding, semi-automatic carbon dioxide gas shielded welding or manual arc welding is adopted; when the temperature is lower than 0 ℃, the two sides of the welding crater are preheated by 100mm length respectively.
Claims (3)
1. A construction method for a soft soil cast-in-place concrete foundation is characterized by comprising the following steps: the concrete pile comprises a plurality of H-shaped steel piles, a plurality of reinforcing steel bars and a concrete foundation layer which are vertically arranged, wherein a concrete block is arranged above each H-shaped steel pile, and the length of the H-shaped steel pile exposed out of the upper surface of the concrete block is 800-1500 mm; the steel bars are laid on the concrete block, each H-shaped steel pile is correspondingly bound with the steel bar, and the concrete foundation layer is formed by upward pouring on the basis of the steel bar;
the thickness of the concrete foundation layer is 1.8-2.5 times of the length of the upper surface of the concrete block exposed out of the H-shaped steel pile;
the construction method comprises the following steps:
s1, calculating the number and the type of the H-shaped steel piles required by each foundation of the self-standing tower according to the bearing capacity required by different tower positions as a foundation requirement;
s2, performing sand blasting corrosion prevention on the surface of the H-shaped steel pile, and standing for at least 2 hours;
s3, placing the H-shaped steel piles in a guide frame by using a lifter, placing pile lines, and using a crawler-type hydraulic excavator and a hydraulic hammer of a vibration hammer to beat the H-shaped steel piles one by one; measuring and monitoring the inclination of each H-shaped steel pile at any time, and correcting in a drawing and aligning mode to ensure that the inclination does not exceed 2%; when the inclination is too large and cannot be adjusted by a pulling-aligning method, pulling and striking again;
when the allowance of the H-shaped steel pile which is not driven is 1 m, carrying out butt welding on the H-shaped steel pile, cooling for at least 5min after welding, cleaning welding beading, welding slag and splashes at a welding port, then coating a layer of epoxy resin coating on the welding port, standing for at least 2 hours, and then continuously driving;
performing a knocking test on the H-shaped steel pile after the H-shaped steel pile is driven to the construction depth, and determining that the H-shaped steel pile is qualified if the descending size of the H-shaped steel pile is smaller than a certain value; repeating the steps until all H-shaped steel piles are paved;
s4, excavating a stratum, cutting or welding the H-shaped steel piles to reach the required construction height, correspondingly mounting concrete blocks on each H-shaped steel pile, paving reinforcing steel bars, and correspondingly binding each H-shaped steel pile on the reinforcing steel bars by binding wires;
and S5, pouring a concrete foundation layer.
2. The construction method of the weak soil cast-in-place concrete foundation according to claim 1, characterized in that: the concrete block is a cube, and the side length of the concrete block is 1.5-2.2 times of the height of a web plate of the H-shaped steel pile.
3. The construction method of the weak soil cast-in-place concrete foundation according to claim 1, characterized in that: the sand blasting anticorrosion process in the step S2 comprises the following steps:
s21, performing sand blasting and rust removing by conforming to the length of the H-shaped steel pile and using an S-shaped route during sand blasting to ensure that rust removing is completely omitted;
s22, and then painting an anticorrosive paint within 8 hours: and reserving lengths of 220-300 mm at two ends of the H-shaped steel pile respectively without painting, painting by using epoxy zinc-rich paint as a primer, wherein the intermediate paint is epoxy micaceous iron intermediate paint, and the finish paint is acrylic polyurethane paint.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811305749.1A CN109208628B (en) | 2018-11-05 | 2018-11-05 | Construction method for soft soil cast-in-situ concrete foundation |
| PCT/CN2019/114597 WO2020093922A1 (en) | 2018-11-05 | 2019-10-31 | Cast-in-situ concrete foundation for soft soil, and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811305749.1A CN109208628B (en) | 2018-11-05 | 2018-11-05 | Construction method for soft soil cast-in-situ concrete foundation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109208628A CN109208628A (en) | 2019-01-15 |
| CN109208628B true CN109208628B (en) | 2020-09-01 |
Family
ID=64994411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811305749.1A Active CN109208628B (en) | 2018-11-05 | 2018-11-05 | Construction method for soft soil cast-in-situ concrete foundation |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109208628B (en) |
| WO (1) | WO2020093922A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109208628B (en) * | 2018-11-05 | 2020-09-01 | 中国电建集团山东电力建设第一工程有限公司 | Construction method for soft soil cast-in-situ concrete foundation |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0932006A (en) * | 1995-07-20 | 1997-02-04 | Tsuguhiko Watanabe | Footing for convenient illuminating lamp |
| JP3298468B2 (en) * | 1997-08-06 | 2002-07-02 | 住友金属工業株式会社 | Liquefaction countermeasures for H-shaped steel piles |
| CN1206419C (en) * | 2002-05-28 | 2005-06-15 | 立基工程有限公司 | Combined rock-embedding pile and its construction method |
| KR101091545B1 (en) * | 2009-12-30 | 2011-12-13 | 재단법인 포항산업과학연구원 | Hollow h-section pile foundation, construction method thereof and support structure having the hollow h-section pile foundation |
| CN102489434A (en) * | 2011-11-16 | 2012-06-13 | 上海路丰达表面材料科技有限公司 | Dust-free corrosion-resistant coating process for steel materials |
| US10435858B2 (en) * | 2013-09-03 | 2019-10-08 | Lawrence S. Maxwell | Modular grid foundation |
| CN104562921B (en) * | 2015-01-17 | 2016-05-04 | 福州大学 | A kind of construction method that connects the Integral Abutment Bridge of structure with dog bone shape |
| CN104631436B (en) * | 2015-02-05 | 2016-05-04 | 福州大学 | Improve the method for Integral Abutment supporting pile stress performance with H type concrete-pile |
| CN109208628B (en) * | 2018-11-05 | 2020-09-01 | 中国电建集团山东电力建设第一工程有限公司 | Construction method for soft soil cast-in-situ concrete foundation |
-
2018
- 2018-11-05 CN CN201811305749.1A patent/CN109208628B/en active Active
-
2019
- 2019-10-31 WO PCT/CN2019/114597 patent/WO2020093922A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN109208628A (en) | 2019-01-15 |
| WO2020093922A1 (en) | 2020-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103485360B (en) | A kind of steel platform tower crane foundation and construction method thereof | |
| CN101967985A (en) | Self-propelled inverted arch template construction method | |
| CN106522242A (en) | Foundation pit supporting system for subsurface structure close to soft ground stratum and construction method of foundation pit supporting system | |
| CN106088127A (en) | Open caisson construction method | |
| CN110485429A (en) | A kind of prestressing force fashioned iron assembled combination inner support construction method | |
| CN112681310A (en) | Construction method for inserting and driving Larsen steel sheet pile after hole leading by long spiral drilling machine | |
| CN109208628B (en) | Construction method for soft soil cast-in-situ concrete foundation | |
| CN110593266B (en) | Construction method of foundation pit ramp reinforced supporting structure under heavy-load passing condition | |
| CN108797323B (en) | Steel trestle suitable for hard stratum | |
| CN101476338B (en) | Construction process for miniature steel pipe pile reinforced sedimentation base | |
| CN113216215A (en) | Deep groove support reverse construction method in complex environment | |
| CN105239573B (en) | The interplantation tube anchor rock construction method of shaped steel trestle | |
| CN110029653B (en) | Method for treating steel pipe pile foundation of riprap seabed foundation | |
| CN109024670B (en) | Underground comprehensive pipe gallery protection and reinforcement system penetrating through buried high-voltage cable and reinforcement method | |
| CN114411761B (en) | Advanced pre-supporting system and method for subway tunnel to be built in new building construction | |
| CN110565634A (en) | Method for repeatedly constructing and utilizing ultra-long steel casing | |
| CN113235640B (en) | Steel pipe group pile vibration piling method and positioning tool | |
| TWI623669B (en) | Construction method of advance pavement for preventing underground subsidence before continuous wall construction | |
| CN213014284U (en) | Steel pipe pile structure with inserted-driven lock catch by hole guiding method | |
| CN113356189A (en) | Full-sleeve hole forming construction method for rotary drilling rig | |
| CN112523225A (en) | Construction method for supporting foundation pit by combining static pressure steel sheet pile with reinforced concrete inner support | |
| CN113217002B (en) | Construction method for jacking side positions crossing existing lines in frame culvert points | |
| CN114687356B (en) | Construction method for deep foundation pit excavation of building | |
| CN220377264U (en) | Rotary digging hole-forming cast-in-place pile casing position fixing device | |
| CN213038426U (en) | Extension slide plate for stable and rapid jacking construction of box culvert under large excavation surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |