CN114809065A - Power transmission tower foundation structure and construction method - Google Patents
Power transmission tower foundation structure and construction method Download PDFInfo
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- CN114809065A CN114809065A CN202210383125.1A CN202210383125A CN114809065A CN 114809065 A CN114809065 A CN 114809065A CN 202210383125 A CN202210383125 A CN 202210383125A CN 114809065 A CN114809065 A CN 114809065A
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000007596 consolidation process Methods 0.000 claims abstract description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000004746 geotextile Substances 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims 4
- 238000005553 drilling Methods 0.000 claims 1
- 239000011229 interlayer Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 15
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 239000004927 clay Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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Classifications
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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
-
- 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
-
- 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
- E02D27/36—Foundations formed in moors or bogs
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- Engineering & Computer Science (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)
- Structural Engineering (AREA)
- Foundations (AREA)
Abstract
The invention discloses a power transmission tower foundation structure, which comprises: the raft is characterized in that stress piles are arranged below beam intersection points of the raft, a sand cushion layer is paved at the bottom of the raft, and underground connecting walls are arranged on the four sides of the raft; the plate is provided with a preformed hole, and a water permeable net is arranged in the preformed hole; the vertical drainage body is arranged below the raft plate, inserted into the sand cushion layer and used for improving drainage consolidation efficiency; and the settlement monitoring point is arranged at the top of the underground diaphragm wall. The diaphragm wall and raft foundation of the invention greatly improves the integrity of the foundation, and restrains the horizontal displacement of the soil body under the foundation, so that the drainage consolidation of the soil body can be effectively realized; the sand pile adopted by the invention can greatly improve the drainage consolidation efficiency of the foundation soil body, shorten the construction period and improve the effective foundation bearing capacity.
Description
Technical Field
The invention relates to a power transmission tower foundation structure and a construction method, and belongs to the technical field of foundation foundations.
Background
In order to achieve the aim of double carbon as soon as possible, the national grid is planned to build an extra-high voltage line '24 AC 14 DC', which relates to 3 thousands kilometers of transmission lines and conveys clean energy such as western hydropower, wind power and the like to economically developed areas such as long triangles, bead triangles and the like on a large scale. China is wide in regions and numerous in rivers, and a power transmission channel inevitably needs to cross over a cutting such as the Yangtze river in the construction process. With the increasing tension of power transmission channels, the construction height of towers is gradually increased, and the maximum height of the power transmission line towers in the world reaches 385m at present. For the watersheds of the middle and lower reaches of the Yangtze river, the Qiantangjiang river and the like, the soil layer conditions of partial areas along the line are poor, and the bearing stratum mainly comprises a deep water-rich saturated soft clay layer. At present, aiming at the design of an extra-large power transmission tower, an ultra-long cast-in-place pile foundation type is mainly adopted. The cast-in-place pile has high construction cost and long construction period, and the construction risk of necking, pile breaking and the like exists in the construction of foundation piles in soft soil areas, so that the safety of the structure is difficult to guarantee. Therefore, the inventor proposes a foundation type of an oversize transmission tower suitable for a deep water-rich saturated soft clay layer area.
Disclosure of Invention
The invention aims to provide a power transmission tower foundation structure and a construction method, and aims to overcome the defects that the existing building foundation in the prior art is low in bearing capacity in deep and soft clay areas, and the safety and the stability are difficult to guarantee.
A transmission tower infrastructure, comprising:
the raft is characterized in that stress piles are arranged below beam intersection points of the raft, a sand cushion layer is paved at the bottom of the raft, and underground connecting walls are arranged on the four sides of the raft;
the plate is provided with a preformed hole, and a water permeable net is arranged in the preformed hole;
the vertical drainage body is arranged below the raft plate, inserted into the sand cushion layer and used for improving drainage consolidation efficiency;
and the settlement monitoring point is arranged at the top of the underground diaphragm wall.
Furthermore, the settlement monitoring points are at least eight, and each side of the underground diaphragm wall is at least provided with two settlement monitoring points.
Further, the net that permeates water includes the sleeve, be equipped with the wire net in the sleeve, be equipped with the geotechnological cloth intermediate layer that permeates water in the middle of the wire net.
Further, the stressed pile is one of a spiral pile, a cast-in-place pile or a precast pile.
Further, the vertical drainage body is one of a sand pile, a sand well or a plastic drainage belt.
Furthermore, the diaphragm walls are arranged in a grid form like a Chinese character 'tian' or a Chinese character 'jing' below the raft plates.
A method of power transmission tower infrastructure construction, the method comprising the steps of:
s1: arranging the stressed piles, the vertical drainage bodies, the sand cushion layers, the diaphragm walls, the raft plates and the water permeable nets in sequence;
measuring and setting out, driving a vertical drainage body and a stress pile at a specified position, arranging a ground connection wall, paving a sand cushion layer after finishing, reserving reinforcing steel bar heads or reinforcing steel bar joints on the ground connection wall and the stress pile, roughening the top of the ground connection wall and pouring the ground connection wall and the stress pile into a whole with a raft foundation, and installing a water permeable net at the reserved hole;
s2: directly carry out superstructure construction and simultaneously carry out static and pile and carry on the raft and lay the settlement monitoring position point on the raft basis, adjust the position of upper portion load according to monitoring data and in real time until final foundation subsides and reaches stably.
Compared with the prior art, the invention has the following beneficial effects: the invention has the advantages of simple structure, reasonable design, low construction cost, short construction period and environmental friendliness, and can effectively reduce the risk of overall collapse caused by settlement and slippage of the foundation;
the diaphragm wall and raft foundation of the invention greatly improves the integrity of the foundation, and restrains the horizontal displacement of the soil body under the foundation, so that the drainage consolidation of the soil body can be effectively realized;
the vertical drainage body adopted by the invention can greatly improve the drainage consolidation efficiency of the foundation soil body, shorten the construction period and improve the effective foundation bearing capacity;
according to the invention, the distribution and the size of the load applied on the foundation are controlled through the monitoring result of the settlement monitoring point position, and the stability of the settlement of the foundation and the settlement difference of the whole foundation can be effectively controlled.
Drawings
FIG. 1 is a general cross-sectional view of the structure of the present invention;
FIG. 2 is a cross-sectional view of a water permeable mesh of the present invention;
FIG. 3 is a flow chart of the construction method of the present invention;
in the figure: the system comprises a stressed pile-1, a vertical drainage body-2, a ground connection wall-3, a raft-4, a permeable net-5, a settlement monitoring point-6, a sand cushion layer-7, a permeable soil engineering cloth interlayer-8, a sleeve-9 and a steel wire mesh-10.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.
As shown in fig. 1 to 3, a power transmission tower foundation structure is characterized by comprising:
the raft plate 4 is provided with stress piles 1 below beam intersection points of the raft plate 4, a sand cushion layer 7 is laid at the bottom of the raft plate 4, and the four sides of the raft plate are provided with underground connecting walls 3;
the raft plate 4 is provided with a preformed hole, and a water permeable net 5 is arranged in the preformed hole;
the vertical drainage body 2 is arranged below the raft 4, and is inserted into the sand cushion layer 7 for improving drainage consolidation efficiency;
and a settlement monitoring point 6, wherein the settlement monitoring point 6 is arranged at the top of the underground diaphragm wall 3.
Preferentially, the stressed piles 1 are arranged under the beam joints of the rafts 4 according to the structural stress requirements, spiral piles are recommended to be selected, and cast-in-place piles or precast piles can be selected if the soil layer conditions are good;
as a priority, the vertical drainage body 2: one of sand piles, sand wells or plastic drainage strips can be selected and can be evenly distributed under the raft 4 foundation according to the drainage area, and the main functions of the drainage strip are to accelerate drainage and improve the bearing capacity of the foundation;
as a priority, the diaphragm wall 3: the construction is recommended to use a TRD construction method, and if the required foundation of the building is large, a ground connecting wall can be additionally arranged under the raft 4 in a grid form of a 'field' shape or a 'well' shape, the main function is to restrain the soil body under the raft 4, prevent the soil body under the raft 4 from generating large displacement towards the outside under the action of load, and ensure the effective implementation of later-stage static pressure drainage consolidation;
as a priority, the rafts 4: selecting a beam-slab raft foundation, reserving holes according to the drainage area, connecting the beam-slab raft foundation and the underground diaphragm wall into a whole, and jointly restraining the soil body below the raft to only vertically deform so as to ensure effective implementation of later-stage static pressure drainage consolidation;
as a priority, the water permeable net 5: the water-permeable geotextile consists of an upper layer of steel wire mesh and a lower layer of steel wire mesh and a middle layer of water-permeable geotextile, and is arranged at the reserved holes of the raft plate to ensure that drainage is smoothly carried out and piping can be effectively prevented;
preferably, 6 settlement monitoring points are arranged at the top of the underground diaphragm wall, the number of the settlement monitoring points is not less than eight, and each side is at least two;
in addition, the construction method of the power transmission tower foundation for the deep water-rich saturated soft clay area comprises the following steps:
s1: arranging stressed piles, vertical drainage bodies, sand cushion layers, diaphragm walls, rafts and permeable nets in sequence, measuring and setting out firstly, sanding piles, stressed piles and diaphragm walls at specified positions, laying the sand cushion layers after finishing, reserving reinforcing steel bar heads or reinforcing steel bar joints on the diaphragm walls and the stressed piles, roughening the tops of the piles and pouring a raft foundation into a whole, installing the permeable nets at reserved holes, arranging settlement monitoring points on the raft foundation, and arranging at least eight points on the tops of the diaphragm walls;
s2: after the foundation strength reaches the standard, the upper structure construction can be directly carried out on the raft plate, the static stacking can be simultaneously carried out, the load in the earlier stage is born by the hyperstatic pore water pressure, but along with the structure construction, the load is increased, the pore water pressure is gradually dissipated, the soil body is solidified, the effective stress is improved, the final load value is 1.1-1.3 times of the design load of the upper structure, and the position of the upper load is adjusted in real time according to monitoring data during stacking until the final foundation settlement is stable.
The invention has the advantages of simple structure, reasonable design, environmental protection, low construction cost, time saving and labor saving. Can effectively resist the vertical and lateral deformation of the building foundation structure, and is suitable for building buildings in deep soft soil areas.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A transmission tower infrastructure, comprising:
the raft plate (4), the stress pile (1) is arranged below the beam intersection of the raft plate (4), the four sides of the bottom are provided with the ground connecting walls (3), and the bottom is paved with a sand cushion layer (7);
the raft plate (4) is provided with a preformed hole, and a water permeable net (5) is arranged in the preformed hole;
the vertical drainage body (2) is arranged below the raft plate (4), is inserted into the sand cushion layer (7) and is used for improving drainage consolidation efficiency;
and the settlement monitoring point (6) is arranged at the top of the underground diaphragm wall (3).
2. The transmission tower infrastructure according to claim 1, wherein the settlement monitoring points (6) are arranged in at least eight and the underground diaphragm wall (3) is arranged with at least two settlement monitoring points (6) on each side.
3. The transmission tower infrastructure according to claim 1, wherein the permeable net (5) comprises a sleeve (9), a steel wire mesh (10) is arranged in the sleeve (9), and a permeable geotextile interlayer (8) is arranged in the middle of the steel wire mesh (10).
4. The power transmission tower infrastructure according to claim 1, wherein the force-bearing pile (1) is one of a screw pile, a cast-in-place pile or a precast pile.
5. The transmission tower infrastructure according to claim 1, wherein the vertical drainage body (2) is one of a sand pile, a sand well or a plastic drainage strip.
6. Transmission tower foundation structure according to claim 1, wherein the diaphragm walls (3) are arranged in a grid of "field" or "well" shapes below the rafts (4).
7. A method for constructing a foundation structure of a power transmission tower, the method comprising the steps of:
s1: arranging the stressed piles, the vertical drainage bodies, the sand cushion layers, the diaphragm walls, the raft plates and the water permeable nets in sequence;
measuring and setting out, drilling a vertical drainage body and a stress pile at a specified position, arranging a diaphragm wall, paving a sand cushion layer after the measurement is finished, reserving reinforcing steel bar heads or reinforcing steel bar joints on the diaphragm wall and the stress pile, roughening the top of the diaphragm wall and pouring the diaphragm wall and a raft foundation into a whole, installing a water-permeable net at the reserved hole, and arranging a settlement monitoring point on the raft foundation;
s2: directly carry out superstructure construction and carry out static heap simultaneously on the raft and carry to arrange the settlement monitoring position point on the raft basis, adjust the position of upper portion load according to monitoring data and in real time, settle until final foundation and reach stably.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210383125.1A CN114809065B (en) | 2022-04-13 | Power transmission tower foundation structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210383125.1A CN114809065B (en) | 2022-04-13 | Power transmission tower foundation structure and construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114809065A true CN114809065A (en) | 2022-07-29 |
| CN114809065B CN114809065B (en) | 2024-10-29 |
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