CN213014350U - Transmission line pole tower cast-in-place pile foundation for strong corrosion area - Google Patents

Abstract

A cast-in-place pile foundation for a transmission line tower in a strong corrosion area comprises a cast-in-place pile body and a cast-in-place pile wrapping body; the cast-in-place pile inclusion isolates the position of the cast-in-place pile body in the pile foundation pit from a corrosive stratum; the filling pile inclusion adopts a composite geomembrane, the composite geomembrane is made of a geomembrane and a geotextile, and the number of matched layers of the geomembrane and the geotextile is selected according to the seepage-proofing requirement; the cast-in-place pile comprises a cast-in-place pile body and a cast-in-place pile reinforcement cage, wherein the cast-in-place pile body is formed by pouring concrete on the cast-in-place pile reinforcement cage, the cast-in-place pile reinforcement cage comprises a plurality of main reinforcements which are vertically arranged, all the main reinforcements are encircled into a cylindrical shape through stirrups which are fixed along the periphery, and the bottom ends of the main reinforcements are processed into hook shapes; and arranging foundation bolts at the tops of the cast-in-place pile reinforcement cages, and pouring the protective caps after the foundation bolts complete the connection of the towers. The utility model discloses simple structure, the manufacturing of being convenient for, inclusion intensity is good with impermeability, and damaged risk is low, has optimized concrete key match ratio for the quality and the durability of filling stake are ensured.

Description

Transmission line pole tower cast-in-place pile foundation for strong corrosion area

Technical Field

The utility model belongs to shaft tower construction field relates to a transmission line shaft tower bored concrete pile basis for corroding area by force.

Background

The cast-in-place pile is a deep foundation type, has the advantages of strong adaptability, moderate cost, stable later-stage quality, large bearing capacity and the like, and is widely applied to the power grid construction industry in recent years. Because the regional geological conditions of the power transmission line approach are greatly changed, the power transmission line approach often meets the situation that a highly corrosive tower cannot adopt a conventional common basic form, and because the domestic related engineering application experience is less, designers often still follow the design convention that a cast-in-place pile is not adopted in a highly corrosive region, and a time-consuming and labor-consuming large-excavation basic scheme cannot be adopted. And the specifications of the overhead transmission line basic design technical rules (DL/T5219-2014) stipulate that cast-in-place pile foundations can be adopted in areas with strong corrosion under the measures of effective isolation and effective water resistance.

The existing 'inclusion cast-in-place pile' structure can cause the inclusion damage in engineering application, cannot fully play the protection role of the existing 'inclusion cast-in-place pile' structure and has poor soil isolation effect. Therefore, although the 'inclusion cast-in-place pile' is applied, the quality is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the not good problem of inclusion bored concrete pile protection reliability among the above-mentioned prior art, provide a transmission line shaft tower bored concrete pile basis for strong corrosion area, ensure the quality and the durability of filling pile.

In order to achieve the above object, the present invention provides the following technical solutions:

a cast-in-place pile foundation for a transmission line tower in a strong corrosion area comprises a cast-in-place pile body and a cast-in-place pile wrapping body; the cast-in-place pile inclusion isolates the position of the cast-in-place pile body in the pile foundation pit from a corrosive stratum; the filling pile inclusion adopts a composite geomembrane, the composite geomembrane is made of a geomembrane and a geotextile, and the number of matched layers of the geomembrane and the geotextile is selected according to the seepage-proofing requirement; the cast-in-place pile comprises a cast-in-place pile body and a cast-in-place pile reinforcement cage, wherein the cast-in-place pile body is formed by pouring concrete on the cast-in-place pile reinforcement cage, the cast-in-place pile reinforcement cage comprises a plurality of main reinforcements which are vertically arranged, all the main reinforcements are encircled into a cylindrical shape through stirrups which are fixed along the periphery, and the bottom ends of the main reinforcements are processed into hook shapes; and arranging foundation bolts at the tops of the cast-in-place pile reinforcement cages, and pouring the protective caps after the foundation bolts complete the connection of the towers.

As an optimal scheme, a plurality of main reinforcements form a cylinder shape in an enclosing mode, each stirrup comprises an inward hooping and an outward hooping, and the inward hooping and the outward hooping are arranged spirally.

As a preferable scheme, the spiral distance between the annular inner stirrup and the annular outer stirrup at the lower part of the cast-in-place pile body is 200mm, the spiral distance at the upper part of the cast-in-place pile body is 100mm, and the change position of the spiral distance is 5D away from the top of the cast-in-place pile body;

and D is the pile diameter of the cast-in-place pile body.

Preferably, when the diameter of the cast-in-place pile body is larger than 1.2m, a triangular brace is arranged inside the annular inner stirrup.

As a preferred scheme, the main reinforcement adopts HRB400 hot-rolled ribbed steel bars, and the annular inner stirrup and the annular outer stirrup adopt HPB300 hot-rolled plain round steel bars; the triangular supports are made of HPB300 hot-rolled plain round steel bars.

As a preferred scheme, the main reinforcement is formed by welding one reinforcing steel bar or a plurality of reinforcing steel bars;

the connection length when adopting many reinforcement welding is not less than 5d, and reinforcement welding's joint staggers each other between two adjacent owner muscle, and the interval of staggering is greater than 35d and is not less than 500mm, and d is the main muscle diameter.

As a preferred scheme, the radian of the hook is 135 degrees;

the bending diameter of the main rib is not less than 5d, the length of the bending part is not less than 5d, and d is the diameter of the main rib.

As a preferred scheme, the concrete of the cast-in-place pile body has the lowest strength grade of C40, the cast-in-place pile body is made of S95 slag mixed concrete, S95 slag and a polycarboxylic acid water reducing agent are mixed in the S95 slag mixed concrete, the maximum water-cement ratio of the concrete is 0.38, the sand rate is 0.43, the slump is controlled to be 18-22 cm, and the mixing amount of the S95 slag is 20-25%;

the protective cap is formed by pouring plain concrete with the lowest strength grade of C20.

The utility model discloses construction method of transmission line shaft tower bored concrete pile basis, including following step:

step one, assembling a cast-in-place pile reinforcement cage through a main reinforcement, an annular inner stirrup and an annular outer stirrup, and processing the bottom end of the main reinforcement into a hook shape; when the diameter of the cast-in-place pile body is larger than 1.2m, a triangular support is arranged inside the annular inner hoop rib; fixing foundation bolts at the tops of the cast-in-place pile reinforcement cages;

secondly, pile foundation positioning is carried out on site, and a pile foundation pit is drilled and cleaned;

placing the filling pile inclusion into a pile foundation pit, wherein the filling pile inclusion adopts a composite geomembrane, the composite geomembrane is made of a geomembrane and a geotextile, and the number of matched layers of the geomembrane and the geotextile is selected according to the seepage-proofing requirement;

placing the cast-in-place pile reinforcement cage into the pile foundation pit, and pouring concrete on the cast-in-place pile reinforcement cage to form a cast-in-place pile body; the lowest strength grade of the concrete is C40, the maximum water-cement ratio is 0.38, the sand rate is 0.43, S95 slag is mixed in the concrete to improve the compactness, a water reducing agent is added in a trial on-site manner, and the slump is controlled to be 18-22 cm;

step five, maintaining the cast-in-place pile body;

and step six, mounting the tower and the overhead line, fastening the foundation bolts and pouring the protective caps.

Compared with the prior art, the utility model discloses a transmission line shaft tower bored concrete pile basis has following beneficial effect: the part of the cast-in-place pile body in the pile foundation pit is isolated from the corrosive stratum through the cast-in-place pile wrapping body, the cast-in-place pile wrapping body adopts the composite geomembrane, the advantages of geomembrane seepage prevention and geotextile reinforcement are achieved, the friction performance between the cast-in-place pile wrapping body and the soil surface is good, the wrapping body is not easy to damage compared with the original wrapping body, and the integral corrosion resistance of the foundation is effectively improved. In order to make bored concrete pile inclusion full play protective action and keep the durability of isolated effect, the bottom processing of bored concrete pile steel reinforcement cage is the crotch shape, cuts open the bored concrete pile inclusion when preventing the steel reinforcement cage installation, and the bored concrete pile steel reinforcement cage encloses into the cylinder shape by a plurality of main muscle to set up ring inside stirrup and ring outside stirrup respectively on the inboard of main muscle and outside surface, simple structure and firm, the manufacturing of being convenient for, the utility model discloses can make transmission line shaft tower bored concrete pile's quality and life guarantee to ensure the long-term safe and stable operation of electric power system.

Further, the utility model discloses a main muscle encloses into the cylinder shape, and the inside stirrup of ring all is the spiral with the outside stirrup of ring and arranges, adopts spiral stirrup can fix the main muscle in vertical continuity, guarantees to pour the holistic steadiness of back bored concrete pile.

Further, the utility model discloses the spiral interval of type ring inside stirrup and hoop outside stirrup in bored concrete pile body lower part is 200mm, and the spiral interval on upper portion is 100mm, and the upper portion stirrup is encrypted, guarantees the holistic support performance of steel reinforcement cage in save material.

Further, the utility model discloses the bored concrete pile body adopts premixed concrete, and closely knit degree is higher to rationally add the water-reducing agent, the slump is controlled at 18cm ~ 22cm, has good mobility, cohesiveness and tamping nature, itself has better corrosion resisting property.

Drawings

FIG. 1 is a schematic view of an anticorrosion foundation structure of a cast-in-place pile;

FIG. 2 is a schematic cross-sectional view of a cast-in-place pile of the present invention;

FIG. 3 is a schematic structural view of the present invention, wherein a triangular support is disposed inside the annular inner hoop;

FIG. 4 is a schematic view showing the mutual staggering of the joints welded by the adjacent main ribs of the present invention;

FIG. 5 is a schematic view of a bottom hook of the main rib of the present invention;

in the drawings: 1-pouring pile reinforcement cage; 2-pouring a pile body; 3-wrapping the cast-in-place pile; 4-foundation bolts; 5-a protective cap; 1-1, main ribs; 1-2, hoop reinforcement outward; 1-3, hoop reinforcement inward; and 1-4. a triangular support.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Referring to fig. 1, the utility model is used for transmission line shaft tower bored concrete pile basis in strong corrosion area, including bored concrete pile body 2 and bored concrete pile inclusion 3, bored concrete pile inclusion 3 is completely cut off with the position that bored concrete pile body 2 is located a foundation ditch with the corrosivity stratum. The cast-in-place pile body 2 is formed by pouring concrete on the cast-in-place pile reinforcement cage 1, the cast-in-place pile reinforcement cage 1 comprises a plurality of main reinforcements 1-1 which are vertically arranged, the main reinforcements 1-1 are enclosed into a cylindrical shape, and the inner side surfaces and the outer side surfaces of the main reinforcements 1-1 are respectively provided with an inward hoop reinforcement 1-3 and an outward hoop reinforcement 1-2, as shown in fig. 2. The annular inward stirrups 1-3 and the annular outward stirrups 1-2 are all arranged spirally, the annular inward stirrups 1-3 and the annular outward stirrups 1-2 are arranged in an upper stirrup encryption mode, namely the spiral distance between the annular inward stirrups 1-3 and the annular outward stirrups 1-2 at the lower part of the cast-in-place pile body 2 is 200mm, the spiral distance at the upper part is 100mm, the change position of the spiral distance is 5D away from the top of the cast-in-place pile body 2, and D is the pile diameter of the cast-in-place pile body 2. The bottom end of the main rib 1-1 is processed into a hook shape. And arranging foundation bolts 4 at the tops of the cast-in-place pile reinforcement cages 1, and pouring protective caps 5 after the foundation bolts 4 complete tower connection.

Referring to fig. 3, when the diameter of the cast-in-place pile body 2 is larger than 1.2m, triangular supports 1-4 are arranged inside the annular inner stirrups 1-3. The triangular supports 1-4 are regular triangles, so that the supporting effect is realized in the transverse direction, and the good stability of the whole cast-in-place pile reinforcement cage is ensured.

Referring to fig. 4, the main reinforcement 1-1 is made of one steel bar, or is formed by welding a plurality of steel bars when the length of the main reinforcement 1-1 is too long, the connection length during welding is not less than 5d, the steel bar welded joints between two adjacent main reinforcements 1-1 are staggered, the staggered interval is greater than 35d and not less than 500mm, d is the diameter of the main reinforcement 1-1, and the area percentage of the main reinforcement welded joint is not greater than 50%.

Referring to fig. 5, in the hook shape designed at the bottom end of the main rib 1-1 of the present invention, the radian of the hook is 135 °, the bending diameter of the main rib 1-1 is not less than 5d, the length of the bending part is not less than 5d, and d is the diameter of the main rib 1-1.

The embodiment of the utility model provides a main muscle 1-1 in the middle of adopts HRB400 hot rolling ribbed steel, and ring inside stirrup 1-3 and ring outside stirrup 1-2 adopt HPB300 hot rolling plain steel, and triangular supports 1-4 adopt HPB300 hot rolling plain steel.

The utility model discloses bored concrete pile body 2's concrete minimum strength grade is C40, adopts the ready-mixed commercial concrete, and the biggest glue ratio of concrete is 0.38, and the sand rate is 0.43. In order to improve the compactness of concrete, S95 slag is doped in the concrete of the cast-in-place pile body 2, and the doping amount of the S95 slag is 20-25%. The method is characterized in that a polycarboxylic acid high-efficiency water reducing agent is adopted, the water reducing agent is prepared on site, and the using amount of the water reducing agent is determined on the premise of ensuring good workability. In order to ensure that the concrete has good fluidity, cohesiveness and tamping property, the slump of the concrete is controlled to be 18-22 cm. When the concrete is positioned at the position of the cast-in-place pile close to the ground or exposed to the ground, the concrete is subjected to moisture preservation maintenance or maintenance by coating a curing agent for not less than 7 days. The utility model discloses bored concrete pile body 2's concrete net protective layer thickness is 65mm, and bottom concrete protective layer thickness is 70 mm.

The material of the foundation bolt 4 adopts Q235, 35 steel or 42 CrMo.

For the areas with strong corrosion, the protective cap 5 is formed by pouring plain concrete with the lowest strength grade of C20.

The utility model discloses a bored concrete pile inclusion 3 adopts compound geomembrane, and compound geomembrane is made by geomembrane and geotextile, has the advantage of geomembrane prevention of seepage, geotextile muscle concurrently to with the soil surface within a definite time friction performance good. The geomembrane and the geotextile are one layer or a plurality of layers, and the structural types of one cloth and one film, two cloths and one film, three cloths and two films and the like can be selected according to the seepage-proofing requirement.

The utility model discloses transmission line shaft tower bored concrete pile foundation's construction method specifically includes:

1) firstly, processing a main reinforcement 1-1, an annular outer stirrup 1-2 and an annular inner stirrup 1-3 according to the size of a cast-in-place pile reinforcement cage 1. When the diameter of the cast-in-place pile body 2 is larger than 1.2m, the triangular supports 1-4 need to be processed.

2) And assembling the filling pile reinforcement cage 1 by using the processed main reinforcements 1-1, the annular outer stirrups 1-2 and the annular inner stirrups 1-3, and assembling triangular supports 1-4 on the filling pile reinforcement cage 1 if necessary.

3) The anchor bolts 4 are fixed to the bored concrete pile cage 1 at the designed positions.

4) And (5) pile foundation positioning, pile foundation pit drilling and hole cleaning are carried out on site.

5) And placing the processed cast-in-place pile inclusion 3 into a pile foundation pit.

6) The cast-in-place pile reinforcement cage 1 is installed in the pile foundation pit into which the cast-in-place pile casing 3 has been placed.

7) The cast-in-place pile body 2 is cast by C40 concrete, and the casting process should be continuous.

8) And (5) maintaining the cast-in-place pile.

9) And (5) inspecting the quality of the pile and the cast-in-place pile.

10) And (4) installing a tower and an overhead line.

11) And after the towers and the overhead lines are completely installed, fastening the anchor bolts 4, and pouring the protective caps 5 by using C20 plain concrete.

The utility model discloses in bored concrete pile steel reinforcement cage equipment in-process, be the crotch shape with the bottom processing of main muscle, reduced the damaged risk of inclusion, be greater than 1.2 m's bored concrete pile body to the diameter, the inside of stirrup sets up the triumph in the hoop, and the triumph is from transversely playing the supporting role, guarantees that bored concrete pile steel reinforcement cage wholly has good steadiness. Put into bored concrete pile inclusion in the stake foundation ditch and adopt compound geomembrane, compound geomembrane adopts geomembrane and geotextile to make, has geomembrane prevention of seepage concurrently, the advantage that geotextile adds the muscle to and have good frictional property between the soil horizon, the cooperation number of piles of selecting geomembrane and geotextile according to the prevention of seepage requirement, can select a cloth membrane, two cloth membranes, two membranes of three cloth and class of structural style, the inclusion in the past the utility model discloses the inclusion material of selecting not only the prevention of seepage performance is good, and difficult damage is more fit for. The minimum strength grade of concrete adopted in the pouring process of the cast-in-place pile body is C40, the maximum water-cement ratio is 0.38, the sand rate is 0.43, S95 slag is mixed in the concrete to improve the compactness, a water reducing agent is added in a field trial mode, the slump is controlled to be 18-22 cm, and the key mix proportion of the concrete of the cast-in-place pile body is optimized, so that the stirring quality and the workability of the concrete are guaranteed, the compactness of the concrete is high, and the cast-in-place pile body has good fluidity, cohesiveness and tamping property, and has good corrosion resistance after being poured and formed. The utility model is simple and reasonable, the manufacturing of being convenient for, inclusion intensity and impermeability are good, and difficult damaged pours the link diversified optimization from bored concrete pile steel reinforcement cage structure, bored concrete pile inclusion material and bored concrete pile body, finally obtains can reliably be applied to the transmission line shaft tower basis in strong corrosion area.

The above-described preferred embodiments of the present invention are not intended to limit the present invention, and it should be understood by those skilled in the art that the present invention can be modified and replaced by other simple modifications and replacements without departing from the spirit and principle of the present invention, and the modifications and replacements also belong to the protection scope covered by the claims.

Claims (8)

1. The utility model provides a transmission line shaft tower bored concrete pile basis for strong corrosion area which characterized in that: comprises a cast-in-place pile body (2) and a cast-in-place pile inclusion body (3); the cast-in-place pile inclusion (3) isolates the position of the cast-in-place pile body (2) in the pile foundation pit from a corrosive stratum; the filling pile inclusion (3) adopts a composite geomembrane, the composite geomembrane is made of a geomembrane and a geotextile, and the number of matched layers of the geomembrane and the geotextile is selected according to the seepage-proofing requirement; the cast-in-place pile comprises a cast-in-place pile body (2) and a cast-in-place pile reinforcement cage (1), wherein the cast-in-place pile reinforcement cage (1) is formed by pouring concrete on the cast-in-place pile reinforcement cage (1), the cast-in-place pile reinforcement cage (1) comprises a plurality of main reinforcements (1-1) which are vertically arranged, all the main reinforcements (1-1) are enclosed into a column shape through stirrups which are fixed along the periphery, and the bottom ends of the main reinforcements (1-1; the top of the cast-in-place pile reinforcement cage (1) is provided with foundation bolts (4), and the foundation bolts (4) are used for pouring the protective cap (5) after the tower connection is completed.

2. The cast-in-place pile foundation for the transmission line towers in the high-corrosion areas as claimed in claim 1, wherein:

the main reinforcements (1-1) are enclosed into a cylinder shape, each hoop comprises an inward hoop (1-3) and an outward hoop (1-2), and the inward hoop (1-3) and the outward hoop (1-2) are spirally arranged.

3. The cast-in-place pile foundation for the transmission line towers in the high-corrosion areas as claimed in claim 2, wherein: the spiral space between the annular inward stirrups (1-3) and the annular outward stirrups (1-2) at the lower part of the cast-in-place pile body (2) is 200mm, the spiral space at the upper part of the cast-in-place pile body is 100mm, and the change position of the spiral space is 5D away from the top of the cast-in-place pile body (2);

and D is the pile diameter of the cast-in-place pile body (2).

4. The cast-in-place pile foundation for the transmission line towers in the high-corrosion areas as claimed in claim 2, wherein: when the diameter of the cast-in-place pile body (2) is larger than 1.2m, triangular supports (1-4) are arranged inside the annular inner stirrups (1-3).

5. The cast-in-place pile foundation for transmission line towers in high-corrosion areas as claimed in claim 4, wherein:

the main reinforcement (1-1) adopts HRB400 hot-rolled ribbed steel bars, and the hoop inside the ring (1-3) and the hoop outside the ring (1-2) adopt HPB300 hot-rolled plain round steel bars; the triangular supports (1-4) adopt HPB300 hot-rolled plain round steel bars.

6. The cast-in-place pile foundation for the transmission line towers in the high-corrosion areas as claimed in claim 1, wherein:

the main reinforcement (1-1) is formed by welding one steel bar or a plurality of steel bars;

the connection length when a plurality of steel bars are welded is not less than 5d, the steel bar welded joints between two adjacent main bars (1-1) are staggered, the staggered interval is more than 35d and not less than 500mm, and d is the diameter of the main bars (1-1).

7. The cast-in-place pile foundation for the transmission line towers in the high-corrosion areas as claimed in claim 1, wherein:

the radian of the hook is 135 degrees;

the bending diameter of the main rib (1-1) is not less than 5d, the length of the bending part is not less than 5d, and d is the diameter of the main rib (1-1).

8. The cast-in-place pile foundation for the transmission line towers in the high-corrosion areas as claimed in claim 1, wherein: the concrete of the cast-in-place pile body (2) has the lowest strength grade of C40, and the slump is controlled to be 18-22 cm; the protective cap (5) is formed by pouring plain concrete with the lowest strength grade of C20.

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