CN114525806A - Iron tower single-pile combined foundation and construction method thereof - Google Patents
Iron tower single-pile combined foundation and construction method thereof Download PDFInfo
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- CN114525806A CN114525806A CN202210332625.2A CN202210332625A CN114525806A CN 114525806 A CN114525806 A CN 114525806A CN 202210332625 A CN202210332625 A CN 202210332625A CN 114525806 A CN114525806 A CN 114525806A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 66
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 3
- 238000010168 coupling process Methods 0.000 claims 3
- 238000005859 coupling reaction Methods 0.000 claims 3
- 238000009412 basement excavation Methods 0.000 abstract description 7
- 230000006378 damage Effects 0.000 abstract description 5
- 239000002689 soil Substances 0.000 abstract description 2
- 150000002505 iron Chemical class 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Foundations (AREA)
Abstract
The invention relates to the field of iron tower construction, and discloses an iron tower foundation and a construction method thereof. This iron tower single pile combination foundation includes a foundation pile and many tower foot tie-beams, the foundation pile is located the centre of many tower foot tie-beams, each tower foot tie-beam one end all is connected with the foundation pile, the other end outwards diverges and extends and form the extension, the extension is provided with the tower foot connection structure who is used for connecting the iron tower leg. The single-pile combined foundation for the iron tower is only excavated and poured in the center of the iron tower, the occupied area and the excavation of the foundation are greatly reduced, the limitation of site conditions on the iron tower foundation is reduced, meanwhile, the influence and the damage of the iron tower foundation on the periphery are reduced, and the problems that the construction of four independent foundations in a mountainous area is difficult, the soil moving area of a protection area is limited, the frost heaving has large influence on the foundation uplift and the like can be effectively solved.
Description
Technical Field
The invention relates to the field of iron tower foundations, in particular to an iron tower foundation and a construction method thereof.
Background
The iron tower of transmission line is the four-legged iron tower most common, and current four-legged iron tower basis conventional adoption is the mode of every tower leg next basis, with load on the iron tower transmit the ground in, like the utility model patent of publication No. CN203411988U, nevertheless along with line construction, there are following several kinds of circumstances four-legged iron tower legs and adopt the difficulty that independent foundation is difficult to the construction:
1. four-leg iron towers built along cities and roads around the cities cannot build four foundations due to municipal water and electricity pipelines buried under roadsides;
2. the line passes through an ecological environment protection area, a water source area, an aquaculture base and the like, so that the soil moving area and range are limited, and the four-leg foundation can not meet the requirements;
3. the site for the hydropower transmission line in the mountainous area is narrow, and four independent foundations cannot be built on the isolated mountain bags or cliff sides;
4. in a plateau or gobi site with a fragile ecological environment, four independent foundations are constructed to seriously damage the tower footing environment, so that the environment-friendly water conservation requirement cannot be met;
5. the geological condition is hard, the foundation excavation is difficult, the mechanical excavation space is limited by adopting a small-section independent foundation, and the investment is increased by adopting a large-section independent foundation;
6. the excavation risk of the tower with poor geological conditions and large terrain gradient is high by adopting four independent foundations, and the environmental damage is large;
7. in the area with larger frost heaving grade and depth, the frost heaving force in the four-leg independent foundation has larger influence on the foundation uplift, so that the engineering quantity is greatly increased; the above problems are all difficult to solve by the conventional basic types.
Disclosure of Invention
The invention aims to provide an iron tower single-pile combined foundation and a construction method thereof, which can reduce the limitation of site conditions on the iron tower foundation and reduce the influence of the iron tower foundation on the periphery.
The invention discloses an iron tower single-pile combined foundation which comprises a foundation pile and a plurality of tower foot connecting beams, wherein the foundation pile is positioned in the middle of the plurality of tower foot connecting beams, one end of each tower foot connecting beam is connected with the foundation pile, the other end of each tower foot connecting beam is outwards diverged and extended to form an extending part, and the extending part is provided with a tower foot connecting structure for connecting iron tower legs.
Preferably, the bottom of the foundation pile is provided with a foundation expansion head.
Preferably, the tower foot connecting beam is horizontally arranged.
Preferably, the tower foot connecting beam is disposed obliquely upward from the foundation pile to the extension part.
Preferably, each of the tower foot connecting beams is connected to the foundation pile at the same level.
Preferably, each of the tower foot connecting beams is connected to a foundation pile at different levels.
Preferably, the tower foot connecting structure is a foundation bolt, the bottom of the foundation bolt is connected with an anchor plate, and the anchor plate is located below the steel bars of the tower foot connecting beam.
Preferably, the tower foot connecting beam is made of concrete or a section steel material.
The construction method of the iron tower single-pile combined foundation comprises the following steps:
designing a single-pile combined foundation of an iron tower;
excavating a foundation pit according to the design of the foundation pile, and excavating a groove of the tower foot connecting beam;
binding reinforcing steel bars, arranging a tower foot connecting beam, opening and fixing pre-embedded foundation bolts according to the root of the iron tower to serve as a tower foot connecting structure after the construction, erecting a template, and pouring concrete to form the single-pile combined foundation of the iron tower.
Preferably, when the single-pile combined foundation of the iron tower is designed, a load is loaded on a tower foot connecting structure of the tower foot connecting beam, and the size and the direction of the loaded load are determined according to the conditions of worst uplift force, worst downforce and worst horizontal force calculated according to various working conditions of the iron tower.
Preferably, when the single-pile combined foundation of the iron tower is designed, the foundation acting force is calculated according to the annual average temperature condition, the deflection of the tower foot connecting beam is calculated according to the foundation acting force, and the pre-lifting value of the designed tower foot connecting beam is larger than the calculated deflection of the tower foot connecting beam.
The invention has the beneficial effects that: the utility model provides a single pile of iron tower is united basis is only in excavation of iron tower center and a basis of pouring, and this basis significantly reduces the foundation and takes up an area of and excavates, reduces the restriction of site conditions to iron tower basis, reduces iron tower basis simultaneously and to peripheral influence and destruction, can effectively solve among the background art city underground line many, four independent foundation construction difficulties in mountain area, protection zone move native regional restriction, frost heaving and pull out difficult problems such as influence is big on the basis.
Drawings
FIG. 1 is a schematic view of one embodiment of the present application;
FIG. 2 is a diagram of another embodiment of the present application;
fig. 3 is a schematic diagram of an example of the calculations of the present application.
Reference numerals: the foundation comprises a foundation expansion head 1, foundation piles 2, tower foot connecting beams 3 and a tower foot connecting structure 4.
Detailed Description
The present invention is further described below.
The invention discloses an iron tower single-pile combined foundation which comprises a foundation pile 2 and a plurality of tower foot connecting beams 3, wherein the foundation pile 2 is positioned in the middle of the plurality of tower foot connecting beams 3, one end of each tower foot connecting beam 3 is connected with the foundation pile 2, the other end of each tower foot connecting beam is extended in an outward diverging mode to form an extending portion, and the extending portion is provided with a tower foot connecting structure 4 for connecting iron tower legs.
Wherein, the tower foot connection structure 4 on the tower foot tie-beam 3 is used for connecting the tower foot of iron tower, tower foot connection structure 4 is rag bolt usually, also can adopt current other connected modes, the quantity of tower foot tie-beam 3 can be confirmed according to tower foot quantity, present most iron tower feet are four, the quantity of tower foot tie-beam 3 also is four usually promptly, 2 quantity of foundation pile of whole basis then only are one, it is located the intermediate position of each tower foot tie-beam 3, the effort of each tower foot passes through tower foot tie-beam 3 and transmits to 2 departments of foundation pile, stably bear by foundation pile 2. Because only one foundation pile 2 is arranged, the limitation of site conditions on the iron tower foundation is reduced, and the influence and damage of the iron tower foundation on the periphery are reduced.
The construction method of the iron tower single-pile combined foundation comprises the following steps:
designing a single-pile combined foundation of an iron tower;
excavating a foundation pit according to the design of the foundation pile 2, and excavating a groove of the tower foot connecting beam 3;
binding reinforcing steel bars, arranging a tower foot connecting beam 3, opening and fixing pre-embedded foundation bolts according to the root of the iron tower to serve as a tower foot connecting structure 4, erecting a template, and pouring concrete to form the single-pile combined foundation of the iron tower.
When in design, the conditions of an iron tower and a site need to be considered, the foundation needs to meet the installation requirement of the iron tower and is matched with the site conditions, and the site conditions comprise factors such as the surrounding environment, the geological topography and the like; when excavation foundation ditch and slot, can adopt machinery or artifical excavation, because required foundation ditch and slot relative area is less, consequently can reduce the engineering volume to a certain extent. The tower foot connecting beam 3 is made of concrete or section steel materials. If 3 adoption concrete of tower foot tie-beam, then 3 also need the ligature reinforcing bars of tower foot tie-beam, the reinforcing bar of foundation pile 2 and 3 of tower foot tie-beam can separately the ligature, but preferred mode is 2 reinforcing bars of foundation pile and 3 reinforcing bars of tower foot tie-beam ligatures simultaneously to guarantee effective anchor and connect, if 3 adoption shaped steel of tower foot tie-beam, can be with shaped steel and 2 steel bar connections of foundation pile, guarantee stability. When the template is erected, the template needs to be fixed firmly, and measures can be taken to ensure the sizes of the foundation pile 2 and the tower foot connecting beam 3 and the thickness of the steel bar protective layer. Preferably, after the template is fixed, the height of the foundation pile 2, the height and direction of the tower foot connecting beam 3, the foundation root opening and the foundation bolt root opening are rechecked to be equal in size, after rechecking is correct, foundation concrete is poured, the concrete is poured and vibrated at the same time, the concrete pouring and vibrating around the foundation bolt needs to ensure that the position of the foundation bolt is unchanged, after the concrete pouring is finished, the height of the foundation pile 2, the height and direction of the tower foot connecting beam 3, the foundation root opening and the foundation bolt root opening are rechecked to be equal in size, and after correction is correct, concrete curing is carried out according to corresponding standards.
The stability of foundation pile 2 is especially important, for improving the stability of foundation pile 2, in the preferred embodiment of this application, foundation extension head 1 is provided with in the bottom of foundation pile 2, and foundation extension head 1 can improve foundation pile 2 atress performance, and no matter the pressure of basis, pull up, the performance of being bent can both promote. The foundation extension head 1 itself may not be provided with reinforcing bars, but needs to be cast integrally with the foundation pile 2 through reinforcing bars and concrete.
The foundation is mainly pressed and bent, the uplift load exists only under the condition that the front side and the rear side of the iron tower are uplifted, and most of the load is pressed, therefore, under normal conditions, the tower foot connecting beam 3 can be horizontally arranged or obliquely upwards arranged from the foundation pile 2 to the extending part, meanwhile, the tower foot connecting beam 3 can be connected to the same horizontal height of the foundation pile 2 or different horizontal heights of the foundation pile 2, and can be specifically matched according to requirements, for example, the extending part of each tower foot connecting beam 3 can be arranged to be different heights according to the terrain and the iron tower requirements, as shown in figure 1, when the tower foot connecting beam 3 is connected to the same horizontal height of the foundation pile 2, the height of the extending part can be adjusted by adjusting the length and the inclination angle of the tower foot connecting beam 3, and then the height and the position of the tower foot connecting structure 4 are adjusted to adapt to the tower foot, as shown in figure 2, when the tower foot connecting beam 3 is horizontally arranged, the height and the position of the tower foot connecting structure 4 can be adjusted to be matched with the tower foot by adjusting the connecting height and the length of each tower foot connecting beam 3.
When the single-pile combined foundation of the iron tower is designed, loads are loaded on the tower foot connecting structures 4 of the tower foot connecting beams 3, and the size and the direction of the loaded loads are determined according to the conditions of worst uplift force, worst downforce and worst horizontal force calculated according to various working conditions of the iron tower, so that the stability of the foundation is ensured.
As shown in fig. 3, the acting forces of four tower legs of a 110kV linear tower under the same working condition are as follows:
| leg number | Vertical force (kN) | X-direction horizontal force (kN) | Y-direction horizontal force (kN) |
| A | -111.84 | 4.3 | -13.66 |
| B | 330.26 | -31.09 | -31.57 |
| C | 61.32 | -7.8 | -9.71 |
| D | -387.56 | -35.04 | -35.65 |
The upper surface load is the foundation acting force on each tower leg corresponding to the working conditions of maximum upward pulling and maximum downward pressing load, the negative value of the vertical force represents downward pressing, and the positive value represents upward pulling. On loading four loads of ABCD in the table and corresponding tower leg in figure 3, calculate pile foundation atress and crossbeam atress, then calculate pile foundation 2 and 3 specifications of tower foot tie-beam according to pile foundation standard and concrete standard, including cross-sectional dimension and reinforcing bar quantity etc. it is 1.2m to finally determine the pile foundation 2 diameter, and the reinforcing bar adopts 26 22mm, and 3 specifications of tower foot tie-beam are root height 0.9m, wide 0.6m, 6 each 28mm reinforcing bars in upper and lower plane.
In order to ensure that the height of the tower foot is not influenced by downward deflection after the connecting cross beam is stressed, when the single-pile combined foundation of the iron tower is designed, the maximum foundation acting force is calculated according to the annual average temperature condition, the deflection of the tower foot connecting beam 3 is calculated according to the maximum foundation acting force, and the calculated deflection of the tower foot connecting beam 3 is used as the pre-lifting value of the designed tower foot connecting beam 3. The pre-lifting value of the tower foot connecting beam 3 can ensure that the tower foot connecting beam 3 is in an accurate height position after bearing load, and the height position of the tower foot is accurate.
Similarly, taking the 110kV linear tower shown in fig. 3 as an example, the working condition for calculating the deflection is that the wind speed is 5m/s, the ground wire is not covered with ice, the annual average temperature is 5 ℃, and the acting force of the tower at the annual average temperature is:
| leg number | Vertical force (kN) | X-direction horizontal force (kN) | Y-direction horizontal force (kN) |
| A | -3.91 | 0.15 | -0.48 |
| B | 11.56 | -1.09 | -1.11 |
| C | 2.15 | -0.27 | -0.34 |
| D | -13.56 | -1.23 | -1.25 |
And finally, calculating that the pre-lifting value of the tower foot connecting beam 3 is 8mm, and in the linear tower, because the wind load calculation directions are different, the same maximum load can be generated on each tower leg, and therefore the pre-lifting values of the tower foot connecting beams 3 are the same.
Tower foot connection structure 4 is rag bolt usually, and rag bolt needs certain anchor length to guarantee the atress performance, in order to avoid arousing 3 high increases of tower foot tie-beam because of rag bolt anchor length, the rag bolt bottom is connected with the anchor slab, the anchor slab is located the reinforcing bar below of tower foot tie-beam 3, bears rag bolt's pull-up power through the anchor slab.
Claims (10)
1. Iron tower single pile combined foundation, its characterized in that includes a foundation pile (2) and many tower foot tie-beams (3), foundation pile (2) are located the centre of many tower foot tie-beams (3), each tower foot tie-beam (3) one end all is connected with foundation pile (2), the outside extension that diverges of the other end forms the extension, the extension is provided with tower foot connection structure (4) that are used for connecting iron tower leg.
2. An iron tower single-pile combined foundation as claimed in claim 1, wherein: and a foundation expansion head (1) is arranged at the bottom of the foundation pile (2).
3. An iron tower single-pile combined foundation as claimed in claim 1, wherein: the tower foot connecting beam (3) is horizontally arranged or obliquely upwards arranged from the foundation pile (2) to the extending part.
4. An iron tower single pile combined foundation as claimed in any one of claims 1 to 3, wherein: and the tower foot connecting beams (3) are connected to the foundation piles (2) at the same horizontal height.
5. An iron tower single pile combined foundation as claimed in any one of claims 1 to 4, wherein: and each tower foot connecting beam (3) is connected to the foundation pile (2) at different horizontal heights.
6. The iron tower single-pile combined foundation of claim 1, wherein: the tower foot connection structure (4) is a foundation bolt, the bottom of the foundation bolt is connected with an anchor plate, and the anchor plate is located below the steel bars of the tower foot connection beam (3).
7. The iron tower single-pile combined foundation of claim 1, wherein: the tower foot connecting beam (3) is made of concrete or section steel materials.
8. The construction method of the iron tower single-pile combined foundation according to any one of claims 1 to 7, characterized by comprising the following steps:
designing a single-pile combined foundation of an iron tower;
excavating a foundation pit according to the design of the foundation pile (2), and excavating a groove of the tower foot connecting beam (3);
binding reinforcing steel bars, arranging a tower foot connecting beam (3), opening and fixing pre-embedded foundation bolts according to the root of the iron tower to serve as a tower foot connecting structure (4), erecting a template, and pouring concrete to form the single-pile combined foundation of the iron tower.
9. The construction method according to claim 8, characterized in that when designing the single-pile combined foundation of the iron tower, a load is loaded on the tower foot connecting structure (4) of the tower foot connecting beam (3), the magnitude and the direction of the load are determined according to the conditions of the worst uplift force, the worst downforce and the worst horizontal force calculated according to the working conditions of the iron tower, the stress of the pile foundation (2) and the tower foot connecting beam (3) is calculated, and then the specifications of the pile foundation (2) and the tower foot connecting beam (3) are calculated according to the specifications of the pile foundation and the concrete.
10. The construction method as claimed in claim 8 or 9, wherein, in designing the iron tower single pile combined foundation, foundation acting force is calculated according to the average annual temperature condition, the deflection of the tower foot coupling beam (3) is calculated by the foundation acting force, and the calculated deflection of the tower foot coupling beam (3) is used as the pre-lifting value for designing the tower foot coupling beam (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210332625.2A CN114525806A (en) | 2022-03-31 | 2022-03-31 | Iron tower single-pile combined foundation and construction method thereof |
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| CN202210332625.2A CN114525806A (en) | 2022-03-31 | 2022-03-31 | Iron tower single-pile combined foundation and construction method thereof |
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