CN204199279U - Prefabricated reinforced concrete anchor pole - Google Patents

Abstract

The utility model discloses a prefabricated reinforced concrete anchor, which is characterized in that it comprises an anchor shaft, spiral stirrups and prestressed steel bars; Slurry overflow holes, the two ends of the anchor shaft are provided with anchor rod end joints, and 2N+2 prestressed steel bars are arranged in the anchor shaft body, and the spiral stirrups are wound on the prestressed steel bars. Anchor rods and soil nails have the same safety performance when supporting foundation pits, and can solve the problem of soil collapse in the hole and on the surface during the drilling process.

Description

Prefabricated Reinforced Concrete Anchor

technical field

The utility model belongs to the technical field of construction engineering foundation pit support, in particular to a prefabricated reinforced concrete anchor rod.

Background technique

At present, with the rapid development of urban construction, urban land is becoming more and more tense. In order to fully improve the utilization rate of underground space, the underground part of high-rise buildings is also increasing, and the foundation pits are also getting bigger and deeper. In addition to the requirements of deep foundation pit support construction to meet the safety of its own structure, ensure the safe and smooth construction of the basement, and ensure the safety of the surrounding environment, buildings, and road pipelines, it must also achieve the least impact on the surrounding environment and reduce underground pollution. , The purpose of reducing the cost. Both ordinary anchor rods and soil nail wall support need to be pre-drilled and then put in steel bars and finally grouted, and there are many construction procedures. A large number of actual engineering construction conditions show that when the ordinary anchor rod and soil nail wall support are pre-drilled in loose fill and clay layers, due to the need to continuously inject water into the hole during the drilling process, when too much water overflows the hole It will bring out the soil and scour the surface of the slope, which will easily cause the soil in the hole and on the surface of the slope to collapse. The collapse of the soil in the hole is not conducive to the placement of steel bars and grouting, and the collapse of the soil on the slope surface may even affect the safe use of the foundation pit.

Contents of the invention

The purpose of this utility model is to provide a prefabricated reinforced concrete anchor that can replace ordinary anchors and soil nails for foundation pit support in loose soil layers. With the same safety performance, it can solve the problem of soil collapse in the hole and on the surface during the drilling process.

The technical scheme of the utility model is achieved in that:

A prefabricated reinforced concrete anchor, including an anchor shaft, spiral stirrups and prestressed steel bars, the anchor shaft is made of concrete, in the shape of a hollow cylinder, the anchor shaft is provided with a grout overflow hole, the anchor shaft There are anchor rod end joints at both ends, and 2N+2 prestressed steel bars are arranged in the anchor shaft, and the spiral stirrups are wound on the prestressed steel bars; the anchor rod end joints pressed into the soil body are welded as required The tip of the rod makes it easier to press into the soil.

The bolt rod end joint is composed of a welded connection end plate and a steel collar, which is convenient for connecting an extended bolt to meet the requirements of different support lengths in actual projects.

The prestressed reinforcement anchor hole is arranged on the welding connection end plate, and the position of the anchor hole is consistent with the setting position of the prestressed reinforcement.

The prestressed steel anchor hole is set on the welding connection end plate, which is consistent with the position of the prestressed steel bar. The steel hoop is rolled and pressed into a cylindrical shape by a steel plate, and the seam is welded. The prefabricated anchor rod can use a steel sleeve The hoop connection is lengthened to meet the requirements of different support lengths in actual engineering.

The anchor shaft is formed by the pre-tensioned centrifugal concrete manufacturing process, the length modulus is 3 meters and 6 meters, the outer diameter D=150mm, the inner diameter d=50mm, and there are four overflow holes with a diameter of 20mm every 500mm along the longitudinal direction of the pile body. Grout holes; the formula for calculating the pullout force of prefabricated reinforced concrete anchors: Rt=0.8πd∑lifi, where d is the diameter of the anchor, li is the length of the prefabricated anchor entering each soil layer, and fi is the bond strength between the mortar and each soil layer value.

Compared with the prior art, the outstanding features and remarkable progress of the present utility model are:

1. The anchor rod of the present utility model is a concrete prefabricated component, which can be produced in batches in the factory. The specific project can be ordered in batches according to actual needs. Since the component is a prefabricated component, the construction links on site are reduced, and the construction speed is faster than that of the anchor rod and soil nailing wall Fast support. The construction only needs to use the method of static pressure prefabricated pipe pile to press the prefabricated anchor rod into the soil, and finally the pressure grouting can be completed. The process does not drain the soil to the outside, so it will not cause the soil to collapse, which is a good solution the above problems.

2. Due to the construction method of static pressure piles, this method will produce a soil squeezing effect during construction, which will play a role in compacting the soil in loose soil and unsaturated fill soil. The entire construction process does not discharge soil outward, which is very good It solves the phenomenon of borehole collapse and slope soil collapse when ordinary anchor rods and soil nail walls are supported;

3. The prefabricated reinforced concrete anchor bolt is produced by the factory, which greatly reduces the cost; the reinforcement ratio is small, which greatly saves steel; the diameter is small and the surface area is large; the bearing capacity of unilateral concrete is large; the construction is simple and the technical difficulty is low.

4. Compared with ordinary anchor rods and soil nail wall support, there is no drilling process, and the whole construction process is formed by static pressure at one time, and the operation is simple. Since there is no need to set up additional reinforcement for the anchor rod, the erection reinforcement for the anchor rod (soil nail) in the hole is saved for the project.

Description of drawings

The utility model prefabricated reinforced concrete anchor rod is described below in conjunction with accompanying drawing and embodiment.

Fig. 1 is the structural schematic diagram of the prefabricated reinforced concrete anchor rod of the present utility model.

Fig. 2 is a schematic diagram of reinforcement of the prefabricated reinforced concrete anchor rod body of the present invention.

Fig. 3 is a right side view of Fig. 2 .

The serial number and name of the parts in the figure:

Anchor shaft 1, anchor rod end joint 2, overflow hole 3, rod tip 4, spiral stirrup 5, prestressed steel bar 6.

Detailed ways

In order to introduce the utility model in more detail, the utility model will be further described below in conjunction with the accompanying drawings.

As shown in the figure, the prefabricated reinforced concrete anchor includes an anchor shaft 1, a spiral stirrup 5 and a prestressed steel bar 6. The anchor shaft 1 is made of concrete and has a hollow cylindrical shape. There are overflow holes 3, the two ends of the anchor shaft 1 are provided with anchor rod end joints 2, the anchor shaft 1 is equipped with 2N+2 prestressed steel bars 6, and the spiral stirrups 5 are wound on the prestressed steel bars 6 . The anchor rod end joint 2 pressed into the soil body side is welded with a rod tip 4 as required, in order to be pressed into the soil body more easily. The anchor rod end joint 2 is composed of a welded connection end plate and a steel ferrule, and the steel ferrule is sleeved on the anchor rod shaft 1 . The anchor holes of the prestressed steel bars 6 are arranged on the welding connection end plate, and the positions of the anchor holes are consistent with the setting positions of the prestressed steel bars 6 . The steel ferrule is rolled and pressed into a cylindrical shape by steel plates, and the seams are welded.

The construction principle of the utility model is as follows: during construction, the method of static pressure prefabricated pipe piles is used to press the prefabricated anchor rod into the soil, and the anchor rod rod end joint 2 is used to connect the lengthened anchor rod. grouting. During pressure grouting, the cement slurry is filled with the prefabricated anchor and overflows from the overflow hole 3 into the reinforced soil, hardening and reinforcing the loose soil around the prefabricated anchor.

Claims (5)

1. a prefabricated reinforced concrete anchor pole, it is characterized in that: comprise rock bolt shank (1), spiral stirrup (5) and prestressed reinforcement (6), described rock bolt shank (1) is made up of concrete, in hollow cylindrical, rock bolt shank (1) is provided with extravasating hole (3), rock bolt shank (1) two ends are provided with anchor pole rod ends (2), are provided with 2N+2 root prestressed reinforcement (6) in rock bolt shank (1), and spiral stirrup (5) is wrapped on prestressed reinforcement (6).

2. prefabricated reinforced concrete anchor pole according to claim 1, is characterized in that: anchor pole rod ends (2) is welded with bar point (4), makes it easily be pressed into the soil body.

3. prefabricated reinforced concrete anchor pole according to claim 1, is characterized in that: described anchor pole rod ends (2) is by being welded to connect end plate and steel hoop forms.

4. prefabricated reinforced concrete anchor pole according to claim 3, is characterized in that: described being welded to connect on end plate is provided with prestressed reinforcement (6) anchor hole, and anchor hole position is consistent with the setting position of prestressed reinforcement (6).

5. prefabricated reinforced concrete anchor pole according to claim 3, is characterized in that: described steel hoop is pressed into cylindric by roll of steel plate, and seam seam.