CN108589759A - A kind of shaft tower composite foundation - Google Patents

Abstract

The invention relates to a composite foundation for pole towers. The composite foundation includes: a lower rock layer section and an upper soil layer section, a balance layer is arranged between the rock layer section and the soil layer section; the rock layer section includes: rock layer holes and reinforcing ribs; The soil section includes: an inner cylinder and an outer cylinder; the reinforcing rib is provided between the inner cylinder and the outer cylinder; the reinforcing rib runs through the soil section and the balance layer in turn and extends to the rock formation inside the hole. The pole-tower composite foundation provided by the present invention is aimed at the two common geological conditions in mountainous areas, the overlying soil and the underlying rock and soil conditions, by using two different types of reinforcement ribs in the inner layer tube and outer layer tube of the soil layer section and the rock layer section The structure is organically combined to form a new type of environment-friendly foundation with excellent pullout resistance and anti-overturning bearing performance, which saves more foundation body binder and can effectively solve the problem of spoil, which can effectively reduce the geological damage caused by the current power grid construction. Disasters have good economic and social benefits.

Description

Composite foundation for towers

technical field

The invention relates to a composite foundation in the field of foundation foundations of transmission lines, in particular to a composite foundation for poles and towers.

Background technique

In recent years, with the rapid development of my country's power grid engineering construction, transmission line corridors have become increasingly scarce, and the resulting environmental problems have increasingly attracted the attention of relevant departments. The engineering practice in recent years shows that the geological hazards (slip currents) of power grid engineering are mainly tractive landslides caused by improper disposal of spoil during construction.

The tower foundation of the transmission line mainly bears the uplift load and the horizontal load. According to the construction method, the transmission line tower foundation can usually be divided into large excavation foundation and excavation foundation. The large excavation foundation refers to excavating a foundation pit slightly larger than the size of the foundation floor (greater than 20cm), then supporting the formwork, lowering the steel frame and anchor bolts, and finally pouring concrete. After the concrete solidifies, backfill the soil, and Ramping according to requirements; Excavating the foundation refers to excavating a foundation pit of the same size as the foundation, lowering the steel cage and anchor bolts, using "soil" as the mold, pouring concrete, and finally forming the undisturbed soil foundation. In comparison, the excavation volume of the large excavation foundation is much less than that of the excavation foundation. However, both types of foundations will produce spoils that are not smaller than the volume of the foundation. For some UHV projects, the amount of spoils for a single foundation tower is as high as hundreds of square meters.

Contents of the invention

In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a composite foundation for poles and towers.

The technical solution provided by the present invention is: a composite foundation for pole towers, the composite foundation includes: a lower rock section and an upper soil section,

A balance layer is provided between the rock layer section and the soil layer section;

The rock formation section includes: a rock formation hole and a reinforcing rib arranged in the rock formation hole;

The soil section includes: an inner cylinder and an outer cylinder;

The reinforcing rib is axially provided between the inner cylinder and the outer cylinder;

The reinforcing rib (2) runs through the soil layer section and the balance layer in sequence and extends into the rock layer hole (1).

Preferably, the balance layer includes: a balance board and a cushion;

The balance board is provided with vertical positioning holes, and the positioning holes are arranged in a ring shape, and the reinforcing ribs (2) are arranged inside.

Preferably, the rock formation holes are arranged in a ring;

Cage ribs are arranged on the outside of the reinforcing ribs disposed between the inner tube and the outer tube.

Preferably, the inner cylinder disposed at the upper end of the balance layer includes: a cylinder and a support disposed outside the lower end of the cylinder;

The inside of the cylinder is filled with backfill soil, and the upper end is provided with an isolation leak-proof cover;

The supporting member is composed of fixed rods arranged in a ring.

Preferably, the included angle between the fixed rod and the cylinder is 30°-60°.

Preferably, at least four anchor bolts are provided between the isolation leak-proof cover and the ground, and the anchor bolts are arranged in a ring.

Preferably, the outer cylinder is filled with adhesive.

Preferably, the reinforcing ribs and cage bars are prepared by including the following components in mass percentage: 0.23% carbon, 0.50% silicon, 1.50% manganese, 0.13% vanadium, 0.030% phosphorus, 0.020% sulfur, and 0.0090% nitrogen , and the rest are Fe and unavoidable impurities.

Preferably, the inner cylinder is made of the following components by mass percentage: C: 0.18%, Mn: 1.31%, Si: 0.50%, S: 0.035%, P: 0.035%, Al: 0.115%, Nb: 0.03%, V: 0.08%, Ti: 0.02%, Cu: 0.35%, Cr: 0.20%, Ni: 0.40%, Mo: 0.08%, and the balance is iron and other impurity elements.

Preferably, the binder comprises the following components in parts by weight: 650 parts of 42.5 ordinary Portland cement, _SiO2 content of 88%, average particle size of 0.41 μm, maximum particle size of 0.6 μm 240 parts of admixture, 1120 parts of quartz sand with a particle size of 1.3mm, 60 parts of polyethylhydroxysiloxane and 120 parts of water. Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

(1) The technical scheme provided by the present invention is aimed at the common geological conditions in these two mountainous areas of the overlying soil and the underlying rock and soil conditions. Different types of structures are organically combined to form a new environment-friendly foundation with excellent pullout resistance and overturning resistance, while saving the foundation body binder and effectively solving the spoil problem, which can effectively reduce the current power grid construction. Geological disasters have good economic and social benefits.

(2) In the technical solution provided by the present invention, the angle between the fixed rod of the supporting member and the cylinder is 30°-60°, which better supports and fixes the cylinder.

(3) The technical solution provided by the present invention adopts reinforcing ribs and cage ribs, which have strong hardness, low production cost and good tensile performance.

(4) In the technical scheme provided by the present invention, the adhesive used has better compression resistance.

Description of drawings

Fig. 1 is the structural representation of composite foundation of the present invention;

Fig. 2 is a schematic cross-sectional view of A-A in Fig. 1;

Fig. 3 is the structural representation of pole tower of the present invention;

Among them, 1-rock formation hole; 2-reinforcing rib; 2-1-cage bar; 3-balance board; 4-1-cylinder; Isolation leak-proof cover; 5-outer tube; 6-anchor bolt; 7-bonding agent; 9-pole tower; 9-1-ground wire support; ;9-4-upper circuit electrical clearance circle;9-5upper circuit crank arm;9-6-lower circuit cross arm;9-7-hanger;9-8-lower circuit electrical clearance circle;9-9-down Circuit curved arm; 9-10-tower body; 9-20-upper tower window; 9-21-upper circuit upper conductor; 9-30-lower tower window; 9-51-upper circuit lower conductor; 9-61-down Loop upper wire; 9-91-lower loop lower wire.

Detailed ways

In order to better understand the present invention, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1 to Fig. 2, the pole tower composite foundation provided by the present invention, the composite foundation includes: the lower layer rock layer section and the upper layer soil layer section, a balance layer is arranged between the rock layer section and the soil layer section; The rock formation section includes: a rock formation hole 1 and a reinforcing rib 2 arranged in the rock formation hole 1; the soil layer section includes: an inner layer cylinder and an outer layer cylinder 5; the outer wall of the inner layer cylinder and the inner wall of the outer layer cylinder The reinforcing rib 2 is arranged in the axial direction; the reinforcing rib 2 runs through the soil layer section and the balance layer in turn and extends into the rock formation hole 1;

The balance layer includes: a balance board 3 and a cushion layer; the balance board 3 is provided with vertical positioning holes, and the positioning holes are arranged in a ring shape, and the reinforcing ribs 2 are arranged inside; the cylinder 4-1 used Stuck in the inner ring of the inner ring positioning hole of the balance board 3 and supplemented with support members to reinforce and maintain self-support; the cushion is a sandy soil cushion;

The rock formation holes 1 are arranged in a ring; the reinforcing ribs 2 sequentially pass through the soil layer section and the balance layer and extend into the rock formation holes 1; they are arranged in the inner layer cylinder and the outer layer The outer side of the reinforcing rib 2 between the tubes 5 is provided with a cage rib 2-1; the reinforcing rib 1 and the cage rib 2-1 respectively include the following components in mass percentage: 0.23% carbon, 0.50% silicon , manganese 1.50%, vanadium 0.13%, phosphorus 0.030%, sulfur 0.020%, nitrogen 0.0090%, the rest is Fe and unavoidable impurities;

The inner cylinder located at the upper end of the balance layer includes: a cylinder 4-1 and a support located outside the lower end of the cylinder 4-1; the cylinder 4-1 is filled with soil 4-3 Filling, the upper end of which is provided with an isolation leak-proof cover 4-4; the support member is composed of ring-shaped fixed rods 4-2;

The angle between the fixed rod 4-2 and the cylinder 4-1 is 30°～60°;

There are at least four anchor bolts 6 between the isolated leak-proof cover 4-4 and the ground, and the anchor bolts 6 are arranged in a ring;

The outer layer cylinder 5 is filled with adhesive 7;

The inner cylinder is made of the following components by mass percentage: C: 0.18%, Mn: 1.31%, Si: 0.50%, S: 0.035%, P: 0.035%, Al: 0.115%, Nb: 0.03 %, V: 0.08%, Ti: 0.02%, Cu: 0.35%, Cr: 0.20%, Ni: 0.40%, Mo: 0.08%, and the balance is iron and other impurity elements;

Said binder 7 is prepared from the following components in parts by weight: 42.5 parts of ordinary Portland cement 650 parts, _SiO2 content of 88%, average particle size of 0.41 μm, maximum particle size of 0.6 μm blended 240 parts of raw materials, 1120 parts of quartz sand with a particle size of 1.3mm, 60 parts of polyethylhydroxysiloxane and 120 parts of water.

Based on the same inventive concept, this embodiment also provides a tower, including a tower 9 and a composite foundation for fixing the tower 9 as described above;

As shown in Figure 3, the pole tower 9 includes an upper tower window 9-20 and a lower tower window 9-30 stacked up and down, the bottom of the lower tower window 9-30 is connected to the tower body 9-10; the upper tower window 9-20 The top is the upper circuit cross arm 9-2, the lower part of the upper circuit cross arm 9-2 is connected to the upper circuit crank arm 9-5, and the bottom of the upper circuit crank arm 9-5 is connected to the lower circuit cross arm 9-6; the lower tower window 9- 30. The top is the lower circuit cross arm 9-6, the upper part of the lower circuit cross arm 9-6 is connected to the upper circuit curved arm 9-5, the lower part is connected to the lower circuit curved arm 9-9, and the bottom of the lower circuit curved arm 9-9 intersects and connects The upper part of the tower body 9-10; the upper part of the upper circuit cross arm 9-2 is connected with a ground wire support 9-1.

In addition, the lower circuit cross arm 9-6 may be provided with a hinge node 9-61, which can avoid the formation of a statically indeterminate structure and simplify the transmission of internal forces in the structure.

And, in the middle of the upper circuit cross arm 9-2, the upper circuit upper conductor longitudinally swingable hanger 9-3 is arranged, and the upper circuit upper conductor is connected to the upper circuit upper conductor by the upper circuit cross arm 9-2 and the upper circuit upper conductor vertically swingable hanger 9-3 9-21, the upper circuit curved arm 9-5 is connected to the upper circuit lower conductor 9-51; the lower circuit cross arm 9-6 is provided with a vertically swingable hanger 9-7 for the lower circuit upper conductor through the lower circuit cross arm 9-6 And the vertical swing hanger 9-7 of the upper lead of the lower circuit connects the upper lead 9-61 of the lower circuit, and the lower circuit curved arm 9-9 connects the lower lead 9-91 of the lower circuit. The above wire connection structure is similar to the prior art. The upper tower window 9-20 meets the requirements of the upper circuit electrical clearance circle 9-4, and the lower tower window 9-30 meets the requirements of the lower circuit electrical clearance circle 9-8.

The above are only embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the pending application of the present invention. within the scope of the claims.

Claims (10)

1. a kind of pole-tower composite foundation, described composite foundation comprises: lower layer rock layer section and upper layer soil layer section, it is characterized in that, A balance layer is provided between the rock layer section and the soil layer section; The rock formation section includes: a rock formation hole (1) and a reinforcing rib (2) arranged in the rock formation hole (1); The soil section includes: an inner cylinder and an outer cylinder (5); The reinforcing rib (2) is arranged axially between the inner cylinder and the outer cylinder; The reinforcing rib (2) runs through the soil layer section and the balance layer in sequence and extends into the rock layer hole (1). 2. A kind of pole tower composite foundation as claimed in claim 1, is characterized in that, The balance layer includes: a balance board (3) and a cushion; The balance board (3) is provided with vertical positioning holes, the positioning holes are arranged in a ring shape, and the reinforcing ribs (2) are arranged inside. 3. A kind of pole tower composite foundation as claimed in claim 1, is characterized in that, The rock formation holes (1) are arranged in a ring; A cage rib (2-1) is provided on the outer side of the reinforcing rib (2) arranged between the inner cylinder and the outer cylinder (5). 4. A kind of pole tower composite foundation as claimed in claim 1, is characterized in that, The inner cylinder arranged at the upper end of the balance layer includes: a cylinder (4-1) and a support member arranged outside the lower end of the cylinder (4-1); The cylinder (4-1) is filled with backfill soil (4-3), and its upper end is provided with an isolation leak-proof cover (4-4); The supporting member is composed of fixed rods (4-2) arranged in a ring. 5. A kind of pole tower composite foundation as claimed in claim 4, is characterized in that, The included angle between the fixed rod (4-2) and the cylinder (4-1) is 30°-60°. 6. A kind of pole tower composite foundation as claimed in claim 4, is characterized in that, There are at least four anchor bolts (6) between the isolation leak-proof cover (4-4) and the ground level, and the anchor bolts (6) are arranged in a ring. 7. A kind of pole tower composite foundation as claimed in claim 1, is characterized in that, The outer layer cylinder (5) is filled with adhesive (7). 8. A kind of pole tower composite foundation as claimed in claim 3, is characterized in that, The reinforcing rib (1) and the cage bar (2-1) respectively comprise the following components by mass percentage: 0.23% carbon, 0.50% silicon, 1.50% manganese, 0.13% vanadium, 0.030% phosphorus, 0.020% sulfur %, nitrogen 0.0090%, the rest is Fe and unavoidable impurities. 9. A kind of pole tower composite foundation as claimed in claim 1, is characterized in that, The inner cylinder is made of the following components by mass percentage: C: 0.18%, Mn: 1.31%, Si: 0.50%, S: 0.035%, P: 0.035%, Al: 0.115%, Nb: 0.03 %, V: 0.08%, Ti: 0.02%, Cu: 0.35%, Cr: 0.20%, Ni: 0.40%, Mo: 0.08%, and the balance is iron and other impurity elements. 10. A kind of pole tower composite foundation as claimed in claim 7, is characterized in that, The binder (7) is prepared by comprising the following components in parts by weight _: 650 parts of 42.5 ordinary Portland cement, SiO content of 88%, average particle size of 0.41 μm, maximum particle size of 0.6 μm 240 parts of admixture, 1120 parts of quartz sand with a particle size of 1.3mm, 60 parts of polyethylhydroxysiloxane and 120 parts of water.