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Construction method of prestressed raft foundation

A raft foundation and construction method technology, applied in the direction of basic structure engineering, construction, etc., can solve the problems affecting the bearing capacity of the raft foundation, prone to hydration heat, large concrete volume, etc., and achieve high concrete density and water absorption Good effect, good mechanical properties

Inactive Publication Date: 2015-07-29
江西省中蔚建设集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The concrete volume of the raft foundation is large, and the heat of hydration is prone to occur during the pouring process, and fine cracks appear inside the concrete, which affects the bearing capacity of the raft foundation

Method used

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  • Construction method of prestressed raft foundation

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Embodiment Construction

[0032] The present embodiment will be described in detail below in conjunction with the accompanying drawings.

[0033] The raft foundation thickness of a project is 1.2m, and the raft foundation area is 820M 2 , is a fourteen-story frame structure building.

[0034] The construction steps of this embodiment include:

[0035] (1) Ingredients

[0036] Raft slab foundation concrete is tested according to the traditional mix ratio, and then adjusted according to the characteristics of vacuum concrete. The specific use is as follows: the amount of cement is 8% to 10% lower than that of traditional cement, and the sand rate is 5% higher than that of traditional sand. Water: 175kg, cement: 398kg, sand: 566kg, gravel: 1261kg. Water: 175kg, cement: 362kg, sand: 594kg, gravel: 1261kg. The slump value was 9 cm.

[0037] (2) Binding steel bars

[0038] Before the reinforcement is bound, the reinforcement location line should be popped up to ensure that the location of the reinforce...

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Abstract

The invention discloses a prestressed raft foundation construction method. The method is characterized in that a sloping roof with the gradient larger than or equal to 20 degrees is constructed by a two-sided die sealing method, concrete is restrained in pouring under the condition of the gradient by setting up a sloping roof bottom die and a sloping roof top die, a support made of short reinforcing bars is arranged between the sloping roof bottom die and a sloping roof top die, the diameter of each short reinforcing bar is 22-25mm, the top die and the bottom die are connected into a whole through split bolts, the diameter of each split bolt is 14-16mm, the distance between the split bolts is 250-300mm, a waterstop ring is arranged in the middle of each split bolt, the diameter of the waterstop ring is 40-50mm, and reinforcing bar split heads are arranged on the bottom die to place an upper negative reinforcement framework. When the concrete is poured, sectional casting and tamping are performed, and an upper formwork of the sloping roof is sealed step by step along with the concrete pouring progress from bottom to top.

Description

technical field [0001] The invention relates to a raft foundation, in particular to a construction method for a prestressed raft foundation. Background technique [0002] The concrete volume of the raft foundation is relatively large, and the heat of hydration is prone to occur during the pouring process, and fine cracks appear inside the concrete, thereby affecting the bearing capacity of the raft foundation. Vacuum operation can be used to carry out vacuum operation on the concrete, so that the physical properties of the concrete are in the process of dehydration and compaction on the vacuum coagulation. The internal moisture passes through the concrete layer and is discharged from the surface, which also drives some cement particles to move to the surface. . These particles are hindered by the filter cloth and the compacted surface concrete, and stay in the surface concrete or on the surface of the concrete. In addition, the vacuum degree of the surface layer is greater ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/01
Inventor 叶长青
Owner 江西省中蔚建设集团有限公司
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