CN107938655B - Construction method for PHC pipe pile as supporting system lattice column to pass through structural region - Google Patents
Construction method for PHC pipe pile as supporting system lattice column to pass through structural region Download PDFInfo
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- CN107938655B CN107938655B CN201710865326.4A CN201710865326A CN107938655B CN 107938655 B CN107938655 B CN 107938655B CN 201710865326 A CN201710865326 A CN 201710865326A CN 107938655 B CN107938655 B CN 107938655B
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- 238000010276 construction Methods 0.000 title claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 92
- 239000010959 steel Substances 0.000 claims abstract description 92
- 238000009412 basement excavation Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 19
- 229910000746 Structural steel Inorganic materials 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 235000014121 butter Nutrition 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 230000002787 reinforcement Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000012999 compression bending Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Foundations (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a construction method for a PHC pipe pile as a supporting system lattice column to pass through a structural area, which is characterized by comprising the following steps: A. manufacturing a connector; B. the PHC pipe pile is pressed, a connector is positioned, welded and fixed after reaching the designed elevation, then the next pile pressing construction is carried out, and the connector is installed through the structural area; C. and excavating earthwork after the foundation pit meets the excavation conditions, excavating to the structural elevation, exposing the connector, and cleaning and installing corresponding steel bars, templates and concrete construction outside the connector. The invention adopts the novel connector to change the mode of the traditional bored pile and the steel lattice column into the mode of the PHC pipe pile and the connector, and the bored pile and the steel upright column are canceled, so that the engineering cost can be greatly reduced, the construction speed can be improved, the environmental pollution can be reduced, and the consumption of various resources can be reduced.
Description
Technical Field
The invention relates to the field of buildings, in particular to a connector for PHC pipe piles serving as a lattice column of a supporting system and a construction method thereof, and relates to a method for replacing a PHC pipe pile part section by using the connector to ensure that a structure main body structure in the section area is safe and reliable to pass through, so that a supporting system of a bored pile and a steel column in traditional construction is replaced. The method can be applied to various municipal and house building foundation pit projects in the current building field.
Background
With the rapid increase of urban living population and increasingly deficient land resources, people gradually pay attention to the development and utilization of underground space, various building structures extend to the underground, and the number of deep foundation pit projects is increased. The enclosure forms which can be adopted for large-scale deep foundation pit engineering are various, and the support forms comprise SMW construction method piles, bored piles, underground continuous walls and the like, and the support forms comprise concrete supports, steel pipe supports, section steel supports and the like, but the form of lattice columns which are key parts for stabilizing the enclosure system still basically adopts the form of bored piles and steel columns.
The main disadvantages are:
(1) The environmental pollution is large: because the bottom of the lattice column adopts the form of the bored pile, a large amount of waste slurry can be generated in the construction process of the bored pile, and the influence on the surrounding environment is larger.
(2) The field conditions are as follows: the steel reinforcement cage or the steel upright post of the cast-in-place pile needs to be processed and assembled on site, so that corresponding processing sites, hoisting and transporting equipment and the like need to be prepared.
(3) The construction progress is slow: compared with PHC tubular piles, the pile forming speed of the bored pile is only 1/20 of that of the precast pile, and the efficacy gap is enlarged as the pile diameter and the pile length are increased.
(4) The quality control is difficult: the bored pile has more key points of quality such as pore diameter, verticality, sediment thickness, concrete pouring, steel reinforcement cage and steel upright post on-site processing and installation, and the control difficulty is high.
(5) The construction process has the defects that: main reinforcements in concrete supports and structures can not pass through when encountering steel upright posts, so that the reinforcements are broken, and hidden danger still exists even if reinforcing measures are adopted. In addition, excessive concrete which invades the steel upright post during pouring of the cast-in-place pile concrete needs to be manually chiseled, time and labor are wasted, and the structure leakage is extremely easy to cause due to poor treatment.
(6) The construction process is complex: the early-stage pile foundation construction comprises drilling, hole cleaning, hoisting of reinforcement cages and steel columns, underwater concrete pouring, the later-stage earth excavation and structure manufacturing stage comprises a plurality of procedures such as pile head scumming, steel bar straightening and anchoring, and the like, so that the on-site construction organization management procedure becomes more complicated.
(7) The construction cost is high: the construction cost of the bored pile and the steel upright post is far higher than that of other types of piles, meanwhile, the pile type is only used as a lattice column, and the number of applications in actual foundation pit support engineering is small, so that the unit price is further improved, and the construction cost is increased.
Disclosure of Invention
The invention aims to provide a construction method for a PHC pipe pile serving as a supporting system to pass through a structural region of a lattice column, which solves a series of problems of large environmental pollution, more site conditions, slow construction progress, difficult quality control, construction process defects and the like.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the construction method for the PHC pipe pile serving as the supporting system to pass through the structural area is characterized by comprising the following steps of: A. manufacturing a connector, wherein the main body structure of the connector is a thick-wall seamless steel pipe, filling materials are filled in the thick-wall seamless steel pipe, and the connector is provided with a reserved connector and reserved reinforcing steel bars, and pile top anchor bars are pre-buried and connected with the reserved pile top anchor bars; B. the PHC pipe pile is pressed, connectors are positioned, welded and fixed after reaching the designed elevation, and then the next pile pressing construction is carried out, wherein the position where the connectors are required to be installed is located in the lattice column crossing structure area; C. and excavating earthwork after the foundation pit meets the excavation condition, excavating to the elevation of the supporting structure, exposing the connector, externally installing corresponding steel bars, templates and concrete for construction, butting a reserved connector of the connector with the steel bars of the concrete supporting internal structure, and installing pile top anchor bars by the pile top anchor bar embedded connector to enable the lattice column to be an engineering pile.
According to the preferred embodiment of the invention, hoisting pieces are embedded in the filler at the upper end of the thick-wall seamless steel pipe, and the pipe walls at the upper end and the lower end of the thick-wall seamless steel pipe are provided with cut-open openings.
According to a preferred embodiment of the invention, the connector is arranged between an upper section of lattice column and a lower section of lattice column, and the upper section of lattice column and the lower section of lattice column are PHC tubular piles. The side wall of the thick-wall seamless steel pipe is provided with an upper-layer longitudinal reserved connector and an upper-layer transverse reserved connector, a lower-layer longitudinal reserved connector and a lower-layer transverse reserved connector, a longitudinal pile top anchor bar pre-buried connector is further arranged between the upper-layer longitudinal reserved connector and the lower-layer longitudinal reserved connector, a transverse pile top anchor bar pre-buried connector is further arranged between the upper-layer transverse reserved connector and the lower-layer transverse reserved connector, an upper-layer longitudinal reserved steel bar is connected between the corresponding upper-layer longitudinal reserved connectors, a lower-layer longitudinal reserved steel bar is connected between the corresponding lower-layer longitudinal reserved connectors, a longitudinal reserved pile top anchor bar is connected between the corresponding upper-layer transverse reserved connectors, an upper-layer transverse reserved steel bar is connected between the corresponding upper-layer transverse reserved connectors, a lower-layer transverse reserved steel bar is connected between the corresponding lower-layer transverse reserved connectors, and a transverse pile top anchor bar pre-buried connector is connected between the corresponding transverse pile top anchor bar pre-buried connectors;
the connectors are arranged between an upper section of lattice column and a lower section of lattice column, the upper section of lattice column and the lower section of lattice column are PHC tubular piles, an upper layer longitudinal reserved connector and a lower layer longitudinal reserved connector are respectively connected with structural steel bars in the corresponding longitudinal main body structures, and the upper layer transverse reserved connector and the lower layer transverse reserved connector are respectively connected with the structural steel bars in the corresponding transverse main body structures; and the pile top anchor bar is installed by the pile top anchor bar pre-buried connector so that the lattice column becomes an engineering pile.
According to the preferred embodiment of the invention, the upper layer longitudinal reserved connector, the upper layer transverse reserved connector, the lower layer longitudinal reserved connector and the lower layer transverse reserved connector are all structural steel bar sleeves, the diameter is preferably 25-30 mm, and the longitudinal pile top anchor bar embedded connector and the transverse pile top anchor bar embedded connector are pile top anchor bar sleeves, and the diameter is preferably 18-22 mm.
According to a preferred embodiment of the invention, the lifting element is a lifting bar of phi 16.
The connector has the advantages of wide application range, simple and convenient construction and high reliability, and simultaneously, the mode of the traditional bored pile and the steel lattice column can be changed into the mode of the PHC pipe pile and the connector by adopting the connector, so that the bored pile and the steel column can be canceled, the engineering cost can be greatly reduced, the construction speed can be improved, the environmental pollution can be reduced, and the consumption of various resources can be reduced.
The connector and PHC tubular pile are combined to form the supporting member capable of replacing the bored pile and the steel upright post, and the supporting member has the following advantages:
(1) After the connector is adopted, the PHC pipe pile can be directly used as a lattice column foundation and a pile body, the construction of a bored pile is not required to be independently carried out, slurry is not generated in the construction process, and meanwhile, the static pressure method is adopted for construction, so that the influence on the surrounding environment is greatly reduced.
(2) After the connector is adopted, the lattice column is made of PHC tubular piles and the connector, and machining and installation are not needed in redundant machining sites.
(3) The PHC pipe pile is adopted to greatly accelerate the pile foundation construction speed, and if the structural pile foundation is also in the same type of pile foundation form, the same mechanical equipment can be shared, and the equipment approach variety and quantity are reduced.
(4) The PHC pipe pile and the connector are produced in standardized and large-scale manner in factory buildings, and the PHC pipe pile and the connector are high in processing and manufacturing precision and good in quality.
(5) The connector is buried in advance, can be directly connected with the concrete support and the steel bar in the structure, guarantees construction quality, simultaneously, avoids concrete chisel to remove the process, reduces the quality hidden danger.
Drawings
Fig. 1 is a schematic structural view of an example of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a side cross-sectional view of fig. 1.
Fig. 4 is one of the cross-sectional views of the base plate connection section.
Fig. 5 is a schematic structural view of the reserved connector.
FIG. 6 is a second cross-sectional view of the base plate connection section.
Fig. 7 is a cross-sectional view of fig. 6.
The drawings include:
1. thick-wall seamless steel pipe, 2, filler, 3, hoisting piece, 4, vertical reserved connector, 5, horizontal reserved connector, 6, vertical reserved steel bar, 7, horizontal reserved steel bar, 8, middle layer vertical reserved connector, 9, middle layer horizontal reserved connector, 10, middle layer vertical reserved steel bar, 11, middle layer horizontal reserved steel bar, 104, bottom plate structure, 107, connector, 108, reserved connector, 111, electric welding connection, 112, upper section lattice column, 113, embedded steel bar, 114, fine stone concrete, 115, structural steel bar sleeve, 116, connector protective cover, 117, butter, 118, water stop ring, 119, pile top anchor bar, 127, pile top anchor bar embedded connector, 128, lower row steel bar.
Description of the embodiments
The invention is further described below with reference to the accompanying drawings.
The PHC pipe pile as a supporting system lattice column connector which penetrates through a main structure part comprises a connector main body and is characterized in that the connector main body is a thick-wall seamless steel pipe 1, a filling material 2 is filled in the thick-wall seamless steel pipe 1, a hoisting piece 3 is embedded in the filling material at the upper end of the thick-wall seamless steel pipe, and a cutting opening is formed in the pipe wall at the upper end and the lower end of the thick-wall seamless steel pipe; the connector is internally provided with a reserved connector and a reserved pile top connector, the reserved connector is in butt joint with the supporting structure steel bars, and the pile top anchor bars are installed by the pile top anchor bar embedded connector so that the lattice column becomes an engineering pile and is used for the lattice column to pass through the main structure part.
The product has the following characteristics:
(1) the upper end and the lower end can be connected with PHC pipe piles in a conventional way;
(2) the connector can be provided with a steel bracket, a steel tie beam and other bearing members which are used as steel supporting fulcra;
(3) the connector can ensure the continuous crossing of the steel bars without disconnection;
(4) the connector may mount a water stop member and act as a permanent structure.
In order to achieve the above characteristics, the design scheme of the connector is as follows:
(1) the materials are selected from
In order to meet the requirement of normal butt joint of the PHC pipe pile and the main body material of the connector, a seamless thick-wall steel pipe is selected, the connector can be welded with a finished PHC pipe pile end plate, and meanwhile, the connector can be combined and connected with a steel bracket, a steel tie beam and a water stopping component in a welding mode.
(2) Intensity checking
In order to meet the requirements of various loads generated by construction and a supporting system during pile sinking, steel pipe strength is selected for a connector to carry out checking calculation, and the content comprises PHC pipe pile body compression bending limit bearing capacity and joint weld joint strength checking calculation.
PHC-500-AB-100 is used as a pile body, the vertical force eccentricity of each layer is calculated by taking 350mm, and the bending moment M=0.35. N born by the pile body.
Calculation results: PHC-500-AB-100 had an ultimate eccentric bearing force of 750KN considering an eccentric of 350 mm.
In order to ensure that the strength of a connecting welding seam between the connector and the PHC pipe pile is greater than the strength of the pile body, the checking result of the strength of the welding seam shows that the welding seam of the connector needs to be welded by adopting a split, and when the width and the height of a groove are respectively higher than 12mm, the shearing strength of the connector is greater than the shearing strength of the pile body of the PHC pipe pile, and the strength of the welding seam is equal to the strength of the pile body at the moment, so that the safety of the welding seam is ensured.
Therefore, taking PHC500-AB-100 pipe pile as an example, the connector is a seamless thick-wall steel pipe with the wall thickness of 16mm, and two ends of the connector are cut open, so that the load requirements can be met.
If the design load value changes, parameters such as PHC pipe pile diameter, pile length, connector diameter, wall thickness and the like can be adjusted to meet the construction load requirement.
(3) Buried part arrangement
In order to meet the requirements that concrete support and structural steel bars continuously pass through the connector area, when the connector is manufactured, holes are formed in two sides of the corresponding position of the wall of the connector according to the specification and distribution condition of the steel bars of the design drawing, connectors are placed in the holes, and the middle of the connector is connected by the steel bars with the same requirements as the design drawing.
(4) Auxiliary member
In order to improve the strength of the connector and the durability of the internal reinforcing steel bars, the cavity is filled with equal-strength fine stone concrete or mortar required by a design drawing after the connector is installed with the embedded part. Meanwhile, in order to facilitate construction and hoisting, a hoisting member is arranged at one end of the connector.
(3) Product structure
The product has the following use structure characteristics and application range.
| Application range | Constructional features |
| Enclosure for horizontal support only, steel support or concrete support The tie and lattice column need to pass through the region of the main structure | The lengths of the thick-wall seamless steel pipes and the steel pipes are adjusted according to the structural size, the upper end and the lower end are provided with cutting openings, the cavity in the pipe is grouted, the side wall of the steel pipe is perforated, a connector is placed, and the number of the holes and connectors is increased in each direction and height of the side wall of the steel pipe according to the structural reinforcement bars |
Fig. 1 to 3 are schematic structural views of a connector according to the present invention. As shown in the figure, the side wall of the thick-wall seamless steel pipe is provided with an upper layer longitudinal reserved connector, an upper layer transverse reserved connector, a lower layer longitudinal reserved connector and a lower layer transverse reserved connector, at least one layer of middle layer longitudinal reserved connector 8 is also arranged between the upper layer longitudinal reserved connector and the lower layer longitudinal reserved connector, at least one layer of middle layer transverse reserved connector 9 is also arranged between the upper layer transverse reserved connector and the lower layer transverse reserved connector, upper layer longitudinal reserved steel bars are connected between the corresponding upper layer longitudinal reserved connectors, lower layer longitudinal reserved steel bars are connected between the corresponding lower layer longitudinal reserved connectors, the middle layer longitudinal reserved steel bars 10 are connected between the corresponding middle layer longitudinal reserved connectors 8, the upper layer transverse reserved steel bars are connected between the corresponding upper layer transverse reserved connectors, the lower layer transverse reserved steel bars are connected between the corresponding lower layer transverse reserved connectors, the middle layer transverse reserved steel bars 11 are connected between the corresponding middle layer transverse reserved connectors 9, wherein the upper layer longitudinal reserved connectors, the upper layer transverse reserved connectors, the lower layer longitudinal reserved connectors and the lower layer transverse reserved connectors are all structural steel bar sleeves, the diameter is preferably 25-30 mm, the middle layer longitudinal reserved connectors and the middle layer transverse reserved connectors are pile top anchor bar sleeves, and the diameter is preferably 18-22 mm.
The connector adapter lattice columns need to traverse the area of the body structure.
Fig. 5 is a schematic structural view of the reserved connector. As shown, the reserved connector is a structural steel sleeve 115, wherein the inner end is connected with the embedded steel bars, the outer end is provided with a connector protecting cover 116, and the reserved connector is coated with butter 117 in the outer section.
Fig. 6 to 7 are schematic views showing connection of lattice column crossing structure sections. The connector 107 comprises a thick-wall seamless steel pipe 1 with the wall thickness of 16mm, fine stone concrete 114 is poured into the thick-wall seamless steel pipe 1, a connector 108 and a pile top anchor pre-buried connector 127 are reserved on the side wall of the C-shaped connector 107, pre-buried steel bars 113 connected with the reserved connector 109 and reserved pile top anchor bars connected with the pile top anchor pre-buried connector 127 are arranged in the C-shaped connector 107, the upper end of the C-shaped connector 107 is electrically welded with an upper section of lattice column 112, and the lower end of the C-shaped connector is electrically welded with a lower section of lattice column. During construction, the reserved connector 108 is directly in butt joint with the steel bars in the bottom plate, and meanwhile pile top anchor bars are installed on the pre-buried connector 127 of the pile top anchor bars on the side wall of the connector to enable the pile top anchor bars to be used as engineering piles. 128 is the lower row of rebar.
The connector 107 is configured to take a PHC pile as a lattice column, and the lattice column passes through a main structure part, and is illustrated as a passing through bottom plate structure, an upper layer longitudinal reserved connector and an upper layer transverse reserved connector are arranged on a side wall of the C-shaped connector 107, a lower layer longitudinal reserved connector and a lower layer transverse reserved connector are arranged, a longitudinal pile top anchor bar embedded connector is further arranged between the upper layer longitudinal reserved connector and the lower layer longitudinal reserved connector, a transverse pile top anchor bar embedded connector is further arranged between the upper layer transverse reserved connector and the lower layer transverse reserved connector, an upper layer longitudinal reserved steel bar is connected between the corresponding upper layer longitudinal reserved connectors, a lower layer longitudinal reserved steel bar is connected between the corresponding lower layer longitudinal reserved connectors, a longitudinal pile top anchor bar is connected between the corresponding upper layer transverse reserved connectors, a lower layer transverse pile top anchor bar is connected between the corresponding lower layer transverse reserved connectors, and a lower layer transverse pile top anchor bar is connected between the corresponding transverse reserved connectors;
the connector is arranged between an upper section of lattice column 112 and a lower section of lattice column, the upper section of lattice column and the lower section of lattice column are PHC tubular piles, and the lateral part of the connector is respectively provided with a transverse main body structure and a longitudinal main body structure; the upper layer longitudinal reserved connector and the lower layer longitudinal reserved connector are respectively connected with structural steel bars in the corresponding longitudinal main body structures, and the upper layer transverse reserved connector and the lower layer transverse reserved connector are respectively connected with structural steel bars in the corresponding transverse main body structures; pile top anchor bars are installed by the pile top anchor bar pre-buried connector, so that the lattice column is an engineering pile, and a water stop ring 118 is arranged above the pile top anchor bars 119.
The connector uses the PHC pipe pile to replace the bored pile and the steel upright post to be a part of a deep foundation pit bracing system, and has the following beneficial effects:
(1) The original bored pile and the steel upright post are replaced by PHC pipe piles and connectors, so that the construction process is simplified, and the construction cost is greatly reduced;
(2) In the pile forming process, no slurry and outward transportation are generated, so that part of cost can be saved, and meanwhile, the environmental pollution to the periphery is greatly reduced;
(3) If the PHC pipe pile is adopted as the pile foundation form of the deep foundation pit engineering, the PHC pipe pile is used as a lattice column by using the connector, and the same construction machinery can be used during construction, so that the types and the number of site construction machinery are reduced, and meanwhile, the cost of entering and exiting the site of the machinery is reduced, and the utilization rate of the machinery is improved;
(4) The connector can meet the construction operation conditions of a static pressure method, and when in construction, the influence of construction noise on the surrounding environment can be greatly reduced by adopting the static pressure method for construction;
(5) The connector is very simple and convenient to install in pile forming construction, has the same technology as the common PHC pile extension, and improves the construction speed by more than 10 times compared with the bored pile;
(6) The connector and the PHC pipe pile matched with the connector are subjected to standardized and large-scale production in a factory building of a manufacturer, and the connector is high in processing and manufacturing precision and good in quality. Meanwhile, the site does not need to be provided with an installation processing site, so that the occupied area of the site can be reduced;
(7) The connector main body is made of a weldable material, so that steel corbels, steel tie beams and other supports and water stopping members can be conveniently welded outside the connector after a foundation pit is excavated to the connector elevation.
(8) The connector is embedded in advance, can be directly connected with concrete support and the reinforcing steel bar in the structure, guarantees construction quality, simultaneously, has removed extra measures such as unnecessary concrete chisel removes, reinforcing steel bar is outwards wound, entrance to a cave reinforcement in traditional construction process from, reduces the cost of labor, accelerates construction speed.
(9) The lattice column pile using the connector can be used as engineering pile by installing pile top anchor bars.
The following table is an example of the beneficial effect evaluation of the present invention using a 500mm pile diameter.
The present invention is further illustrated by the following specific examples.
(1) Engineering overview
The engineering for upgrading and reforming a sewage plant in a certain city comprises newly-built pool bodies, wherein the structural plane size is 88.6m83.3 m, and the maximum excavation depth is 12.35m. The pile foundation form of the pool body is PHC pile group piles, the foundation pit enclosure adopts an SMW construction method, the support system is a first-channel concrete support and a second-channel concrete support, and a third steel support is arranged in a local deep-falling area.
Basic form: PHC-500-AB-100 pile length 33m, total 1258
Lower lattice column: phi 800 bored pile length 35m, 87 total
Upper lattice column: 460mm by 460mm pile length 12.5m, 87 pieces total
(2) Product application
By combining the engineering overview, if the product is applied, the design scheme can be optimized, and the PHC tubular pile is adopted to replace a lattice column system of the bored pile and the steel column, so that the construction quality, the progress, the economic benefit and the like can be effectively improved.
The changing process parameters are as follows:
basic form: PHC-500-AB-100 pile length 33m, total 1258
Lower lattice column: PHC-500-AB-100 pile length 30m, 87 roots in total
Upper lattice column: PHC-500-AB-100 pile length 10m, 87 roots in total
Lattice column (traversing structure connecting section) C-type connector length 1.5m,87
(3) Application scheme
(1) According to the requirements of design drawings, parameters such as connector specification, length, elevation and the like are determined, the connector is processed in a processing factory according to the design drawings, the connector comprises material breaking, perforating, embedded parts, grouting and the like, and the connector is transported to the site after the product is cured and inspected to be qualified.
(2) And carrying out construction on site by adopting a static pressure method, carrying out pile pressing according to a determined pile allocation scheme, positioning, welding and fixing connectors after reaching a designed elevation, and carrying out next pile pressing construction, wherein the positions where the connectors are required to be installed are respectively positioned in the area where the lattice columns pass through the bottom plate.
(3) And excavating earthwork after the foundation pit meets the excavation conditions, excavating to the elevation of the supporting structure, exposing the connector, and carrying out concrete construction on the corresponding supporting member and the reinforced template by external installation after the connector is simply cleaned.
A connector: and (3) opening a connector side wall of the concrete supporting area, reserving a connector protective cover, directly connecting with the steel bars (including pile top anchor bars) in the structure, and simultaneously, installing the pile top anchor bars on the connector side wall to enable the connector side wall to be used as engineering piles.
If the PHC pipe pile is adopted for the engineering, the PHC pipe pile is used for replacing a lattice column form of a bored pile and a steel column, the cost input 334.22 ten thousand yuan can be reduced in economic benefit, the construction period can be shortened by 15 days in construction period benefit, and the quality and the environment are improved.
While the invention has been described and illustrated in detail in the foregoing description with reference to specific embodiments thereof, it should be noted that various equivalent changes and modifications could be made to the above described embodiments without departing from the spirit of the invention as defined by the appended claims.
Claims (4)
1. The construction method for the PHC pipe pile serving as the supporting system to pass through the structural area is characterized by comprising the following steps of: A. manufacturing a connector, wherein the main body structure of the connector is a thick-wall seamless steel pipe, filling materials are filled in the thick-wall seamless steel pipe, and the connector is provided with a reserved connector and reserved reinforcing steel bars, and pile top anchor bars are pre-buried and connected with the reserved pile top anchor bars; B. the PHC pipe pile is pressed, connectors are positioned, welded and fixed after reaching the designed elevation, and then the next pile pressing construction is carried out, wherein the position where the connectors are required to be installed is located in the lattice column crossing structure area; C. after the foundation pit meets the excavation condition, performing earth excavation, excavating to the elevation of the supporting structure, exposing the connector, installing corresponding steel bars, templates and concrete outside the connector for construction, butting a reserved connector of the connector with the steel bars of the concrete supporting internal structure, and installing pile top anchor bars by the pile top anchor bar embedded connector to enable the lattice column to be an engineering pile; in the connector, an upper layer longitudinal reserved connector and an upper layer transverse reserved connector are arranged on the side wall of the thick-wall seamless steel pipe, a lower layer longitudinal reserved connector and a lower layer transverse reserved connector are arranged on the side wall of the thick-wall seamless steel pipe, a longitudinal pile top anchor bar embedded connector is further arranged between the upper layer longitudinal reserved connector and the lower layer longitudinal reserved connector, a transverse pile top anchor bar embedded connector is further arranged between the upper layer transverse reserved connector and the lower layer transverse reserved connector, an upper layer longitudinal reserved steel bar is connected between the corresponding upper layer longitudinal reserved connectors, a lower layer longitudinal reserved steel bar is connected between the corresponding lower layer longitudinal reserved connectors, a longitudinal pile top anchor bar is connected between the corresponding upper layer transverse reserved connectors, a lower layer transverse pile top anchor bar is connected between the corresponding lower layer transverse reserved connectors, and a transverse pile top anchor bar is connected between the corresponding lower layer transverse reserved connectors;
the connectors are arranged between an upper section of lattice column and a lower section of lattice column, the upper section of lattice column and the lower section of lattice column are PHC tubular piles, an upper layer longitudinal reserved connector and a lower layer longitudinal reserved connector are respectively connected with structural steel bars in the corresponding longitudinal main body structures, and the upper layer transverse reserved connector and the lower layer transverse reserved connector are respectively connected with the structural steel bars in the corresponding transverse main body structures; the pile top anchor bar pre-buried connector is used for installing the pile top anchor bar so that the lattice column becomes an engineering pile; the reserved connector is a structural steel bar sleeve, wherein the inner side end is connected with embedded steel bars, the outer side end is provided with a connector protective cover, and the reserved connector is coated with butter in the outer side section.
2. The construction method according to claim 1, wherein the hoisting member is embedded in the filler at the upper end of the thick-wall seamless steel pipe, and the pipe walls at the upper end and the lower end of the thick-wall seamless steel pipe are provided with cut-open openings.
3. The method of construction of claim 2, wherein the connector is disposed between an upper section of lattice column and a lower section of lattice column, both of which are PHC piles.
4. The construction method of claim 1, wherein the upper layer longitudinal reserved connector, the upper layer transverse reserved connector, the lower layer longitudinal reserved connector and the lower layer transverse reserved connector are all structural steel bar sleeves, the diameter is 25-30 mm, and the longitudinal pile top anchor bar embedded connector and the transverse pile top anchor bar embedded connector are pile top anchor bar sleeves, and the diameter is 18-22 mm.
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