CN207812477U - Composite screw anchor foundation - Google Patents

Abstract

The utility model provides a compound spiral anchor foundation, which comprises an anchor rod. The top or upper part of the anchor rod is provided with a cylindrical pile foundation, and the lower part of the anchor rod is coaxially pierced with a plurality of circular anchor pieces. The utility model utilizes the characteristics of the anchor sheet of the composite spiral anchor, uses the undisturbed soil to bear part of the uplift force, reduces the uplift force borne by the pile foundation, and fully utilizes the pullout resistance of the spiral anchor and the pullout resistance, compression resistance and The ability to resist horizontal force and give full play to the mechanical characteristics of the undisturbed soil saves basic materials and reduces the cost of the project; its construction adopts mechanical construction, which can effectively improve construction efficiency and is suitable for use in muddy areas.

Description

Composite Spiral Anchor Foundation

technical field

The utility model relates to the field of power transmission line engineering, in particular to a composite spiral anchor foundation.

Background technique

In the construction of transmission line projects, there are soft soil layers in the river terraces of some projects, and the conventional method for tower foundations is to use large slab foundations and large-diameter cast-in-place pile foundations. The large slab foundation has a large amount of excavation, a large amount of foundation steel and concrete, and a high foundation cost; due to the bearing capacity requirements of the cast-in-situ pile foundation, the diameter and pile length are often large, and due to road conditions and terrain restrictions, some towers are generally large It is difficult for machinery to reach the position of the vertical tower, and small machinery cannot meet the pile diameter requirements.

The application number is 201120160609.7. The screw-anchor pottery-excavation composite foundation adopts a spiral anchor sheet, which needs to be rotated and inserted into deep soil for fixing, and is suitable for use in mountainous areas. Due to the helical shape of the anchor piece, the uplift bearing capacity is very limited; moreover, the excavated pottery foundation has a large volume, which requires a large amount of concrete and a high cost, and a lot of waste soil will be generated during construction to damage the environment

Based on this, the present application is filed.

Contents of the invention

The purpose of the utility model is to provide a spiral anchor foundation suitable for use in swampy land, which requires low cost and less damage to the natural environment, and at the same time facilitates mechanized construction.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a composite spiral anchor foundation, including an anchor rod, the top or upper part of the anchor rod is provided with a cylindrical pile foundation, and the lower part of the anchor rod is coaxially pierced with a A number of circular anchor pieces.

The utility model can be further configured as follows: the anchor body and the anchor piece are made of glass fiber reinforced plastic composite material, which can greatly improve the corrosion resistance of the foundation.

The utility model can be further configured as: the anchor body is formed by concrete grouting.

The utility model can be further configured as follows: the number of the anchor pieces is at least three, and the distances between adjacent anchor pieces are equal.

The utility model can be further configured as follows: the lower part of the anchor rod is inserted into the hard soil layer or relatively hard soil layer, and the anchor rod inserted into the hard soil layer is grouted to form an anchor body.

The utility model can be further set as: the part of the anchor rod with the anchor piece is located in the stable soil layer, surrounded by undisturbed soil.

The construction method of the composite spiral anchor foundation is as follows: first, use the rotary drilling bit to rotate down to the specified elevation and then stop, and a space to be filled is formed between the specified elevation soil layer and the ground; The helical anchor drill bit continues to screw down; when the anchor piece of the helical anchor penetrates the soft soil layer and is screwed into the lower stable soil layer, control the drill bit to loosen the helical anchor and withdraw the drill bit above the ground; let it stand for a period of time After the soil is stabilized, concrete grouting is used for the anchor rod/space to be filled to form the anchor body/pile foundation.

The working principle and beneficial effects of the utility model: the utility model anchor rod (with the anchor piece part) can be rotated into the deep soil layer and inserted into the hard soil layer, and the cylindrical soil body disturbed by the downward rotation feeding process, After standing for a period of time, its strength will recover to a large extent, and it can bear a large uplift load; and the circular anchor piece is set horizontally, which can further improve the uplift bearing capacity of the spiral anchor. Then use grouting to form the anchor body, which can further effectively increase the pullout force on the foundation, thereby reducing the force that the foundation part needs to bear, thereby reducing the size of the foundation division, reducing the amount of earth excavation, and reducing construction costs. and damage to the environment.

The composite spiral anchor foundation of the utility model utilizes the action of the anchor piece of the composite spiral anchor and the hard soil layer and the undisturbed soil to bear a part of the uplift force, and reduces the uplift force borne by the concrete foundation on the upper part, which fully utilizes the force of the spiral anchor. Pull-out resistance and the ability of the rigid foundation to resist pull-out, compression, and horizontal force save foundation materials and reduce engineering costs; at the same time, the construction method of the utility model has low operational difficulty and is convenient for construction, and adopts mechanized construction, which can effectively improve construction efficiency.

Description of drawings

Fig. 1 is the overall schematic diagram of the composite helical anchor of the present invention.

As shown in the figure: 1—foundation, 2—anchor, 3—anchor.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific embodiments.

A composite spiral anchor foundation 1 includes an anchor rod 2, the top or upper part of the anchor rod 2 is provided with a cylindrical foundation 1, and the lower part of the anchor rod 2 is coaxially pierced with a number of circular anchor pieces 3. The number of anchor pieces 3 is at least three, and the distances between adjacent anchor pieces 3 are equal. Both the anchor body and the anchor piece 3 are made of fiberglass composite material. The lower part of the anchor rod 2 is inserted into a hard soil layer or a relatively hard soil layer, and the anchor body formed by concrete grouting on its upper part is the pile foundation 1 .

The construction of the above composite spiral anchor foundation 1 is as follows: firstly, use the rotary drilling bit to rotate down to the specified elevation and then stop, and a space to be filled is formed between the specified elevation soil layer and the ground. Replace the helical anchor drill bit with the above anchor rod 2 and anchor piece 3, and continue to screw in; when the anchor piece 3 of the helical anchor penetrates the weak soil layer and is screwed into the lower stable soil layer, control the drill bit to loosen. Open the screw anchor and withdraw the drill bit above the ground; let it stand for a period of time, and after the soil is stable, use concrete grouting for the anchor rod 2/space to be filled to form the anchor body/pile foundation 1.

Based on the above, the utility model provides a composite spiral anchor foundation 1 and a construction method, which has a simple structure, reasonable configuration, and a small volume of the foundation 1, thereby reducing the excavation volume of earth and stone, reducing construction difficulty, and reducing damage to farmland and vegetation , the construction method has simple steps, convenient operation, is convenient for mechanized construction, and can effectively improve construction efficiency. The utility model composite spiral anchor foundation 1 and the construction method have better social and economic benefits when used in muddy areas.

It can be known from technical knowledge that the utility model can be realized through other implementations without departing from its spirit or essential features. Accordingly, the above-disclosed embodiments are, in all respects, illustrative and not exclusive. All changes within the scope of the utility model or within the range equivalent to the utility model are included in the utility model.

Claims (4)

1. a kind of composite screw anchor foundation, including anchor pole, it is characterised in that：The top of anchor pole or upper part are connected with pile foundation, The anchor trend point is coaxially equipped with several round anchors；Pile foundation is noted with concrete after anchor pole gos deep into soil layer stabilization Slurry is formed.

2. composite screw anchor foundation as described in claim 1, it is characterised in that：The anchors quantity is at least three pieces, adjacent The distance between anchors is equal.

3. composite screw anchor foundation as described in claim 1, it is characterised in that：The pile foundation is cylinder.

4. composite screw anchor foundation as described in claim 1, it is characterised in that：Anchor pole band anchors part, which is located at, stablizes soil In layer, surrounding is undisturbed soil.