Wedge anchor bolt reserved hole construction technology

Very large.

1 Analysis of the current situation of traditional reserved hole hole retention method For a long time, we have used the wooden mold to set the reserved hole in the equipment foundation construction. With the development of society, this traditional method of preserving the bolt hole can not adapt to metallurgy. Construction needs for large equipment foundation projects.

1.1 The base of large-scale metallurgical equipment such as hot-rolling mill base continuous casting machine foundation, the amount of concrete sub-irrigation is very large. In the construction, the reserved hole wood mold is often extruded or deformed by water absorption and expansion, and the concrete is not pulled out after being poured out. Case. In the end, only the wind drill will be used to break the wood mold, and it will be pulled out a little bit. Especially for some reserved holes with large visibility, it is more difficult to remove the mold and take longer.

Wedge Anchor

1.2 In order to facilitate the removal of the reserved hole template, some construction units often make the reserved hole template into a wedge-shaped hole template with a small upper surface and a smooth upper surface. After the concrete is poured out, the concrete surface is very It is smooth, and it is small and large. The adhesion between the sub-irrigated concrete and the foundation concrete is very poor, and the fine-grained concrete of the secondary grouting is slightly shrunk. The anchor bolts are easily pulled out from the secondary grouting concrete during operation.

All-tech measures.

4 During the construction work of the top culvert, it is also necessary to pay attention to the inspection and verification of the hydraulic system oil pipe joints to ensure safety and reliability.

6 Actual situation By implementing our planned construction plan, the top and culvert construction is completed according to the expected effect, and the left and right deviation values are 70 degrees and 4, which meets the technical requirements of construction design. The culvert resistance curve is as follows.

In recent years, foreign advanced technology, namely mechanized production of corrugated spiral casings, has been introduced in the project of the brother unit, which has been applied to the reserved anchor bolt holes and achieved good results. However, for large reserved holes with large cross-section and deep depth, the number of models is relatively small compared to each project, and it cannot be mass-produced. It is not worthwhile to customize the manufacturer. Therefore, the technicians of our company have developed the reserved holes for the wedge-shaped anchor bolts based on years of construction experience.

2 wedge-shaped ankle bolts reserved hole construction technical points 2.1 wedge-shaped anchor bolts reserved holes, generally used for equipment anchor bolts required to retain the reserved hole section greater than or equal to 175,175, buried depth greater than 1000 reserved holes .

2.2 Wedge-shaped anchor bolts The cross-sectional size and length of the reserved hole template are not only the size and length of the reserved hole required to be retained by the equipment anchor bolt, but also combined with the characteristics of the wedge-shaped reserved hole.

2.3 The length of the wedge-shaped hole template can be calculated according to the following formula: the depth of the H-bolt inserted into the wedge-shaped private; the A-shaped wedge-shaped reserved hole exceeds the height of the base surface, and the B-shaped wedge-shaped reserved hole bottom is lower than the bottom of the bolt, 2.4 wedge-shaped hole template It is made of ordinary magic steel plate of 24 thick deer. The shearing machine is welded and formed.

2.5 In order to reduce or avoid the deformation of the hole wall, and at the same time increase the resistance between the grouting material and the hole wall of the reserved hole, so that the two are well combined, in the lower half of the wedge hole, the hole die circumference Welding anchor steel bars.

2.6 Anchored steel bars are made of 1-grade steel bars with a diameter larger than ¢6.5mm.

Anchoring steel bar setting method Anchoring steel bar horizontal transverse piercing die, close to the inner wall of the hole die, the outer length of the protruding hole die is greater than 501.

The spacing is from the lower end of the hole up to 200 weld layers per interval, each layer of root. Cross-lap joints and spot welding are firm.

2.7 In order to prevent the deformation of the orifice, the upper end of the lifting hole and the outer side of the concrete are welded with reinforcing steel bars.

2.8 Wedge-shaped holes shall have a bottom at the lower end and a cap at the upper end to prevent debris from entering during concrete construction.

The wedge-shaped hole cap is cut off before the bolt is installed. When the hole cap is cut, only the top plate is cut off, and the wall of the hole beyond the concrete surface is cut, and the wall of the hole is prevented from being thermally deformed, thereby causing a hollow drum between the wall of the hole and the concrete.

If, for some reason, a hollow drum occurs between the hole wall and the concrete, the height of the secondary grout is controlled to be close to the lower end of the hollow drum height when the anchor bolt is fixed. The steel mold of the hollow portion is cut off, the hole wall is chiseled, the concrete surface is sprinkled with water, and then the grouting is performed.

2.9 Because the wedge-shaped reserved hole has a large buried depth and a large weight, when it is fixed and fixed, it should be fixed at least two times, and the fixing frame should be firm and reliable.

3 Application effects and some experiences In the 1549 hot rolling and No. 2 continuous casting machine project of Taigang Key Project, the use of wedge-shaped anchor bolts to reserve holes for new construction technology has good quality and rapid construction progress, and is subject to engineering headquarters and engineering. The quality supervision department praised these two projects and were rated as high-quality model projects in Shanxi Province.

Through the practice of adopting the wedge-shaped reserved hole construction technology, the following points have been realized: the wedge-shaped reserved hole template does not need to be removed, the construction process is reduced, and the construction progress is accelerated.

The wedge-shaped hole has good forming quality, is not easy to be deformed and deformed, and the inside of the hole is clean. Concrete and hole die combined with good anchoring performance.

The wedge-shaped reserved hole template can also be rolled into a conical hole mold by a thin plate machine in a unit having a coil condition. Other methods such as anchoring and fixing are the same.