CN105839642A - Method for preparing riprap grouted concrete - Google Patents

Abstract

The preparation method of riprap grouting concrete, the present invention relates to a concrete preparation method, the present invention is to solve the requirement of concrete working performance and aggregate crushing degree in the construction of large-volume concrete engineering, which not only leads to the increase of project cost, but also leads to slow construction progress Step 1: Preparatory work: According to the construction requirements, formwork or cast-in-place piles are formed, and steel bars are bound according to the construction requirements; Step 2: Putting stones: Put stones into the space surrounded by the template or into the holes of the cast-in-place piles; step 3: Preparation of cement slurry: Step 4: Grouting: inject cement slurry into the space surrounded by the template or into the riprap gap in the hole of the cast-in-place pile; Step 5: For structural components within 3 meters in height, use one-shot Post-grouting of rocks; for structural members with a height greater than 3 meters, repeated layered construction is carried out according to steps 1 to 4, and the invention is used in the technical field of civil engineering materials.

Description

Preparation method of riprap grouting concrete

technical field

The invention relates to a concrete preparation method, in particular to a preparation method of riprap grouting concrete.

Background technique

In large-volume concrete projects, such as large-diameter pile foundations, raft foundations, and large-diameter pile-raft foundations, the concrete needs to meet the requirements of slump and expansion. Aggregate needs to be crushed to a particle size of 5mm-31.5mm. The requirements on concrete work performance and aggregate crushing degree not only lead to the increase of project cost, but also bring about the problem of slow construction progress. Recycled aggregate is of great significance for saving resources, protecting the environment and realizing the sustainable development of the construction industry, but because its production cost is often higher than that of natural aggregate, it is difficult to promote and apply recycled aggregate.

Contents of the invention

In order to solve the problem of high concrete work performance and aggregate crushing degree in the construction of large-volume concrete projects, the present invention not only leads to an increase in project cost, but also leads to slow construction progress, and further needs to provide a preparation method for riprap grouting concrete.

The technical scheme that the present invention takes for solving the above problems is: the grouting riprap concrete preparation method of the present invention is to carry out according to the following steps:

Step 1: Preparatory work: According to the construction requirements, formwork or cast-in-situ piles are formed into holes, and steel bars are bound according to the construction requirements;

Step 2: Throwing stones: Throwing stones into the space surrounded by the template or into the hole of the cast-in-place pile;

Step 3: Preparation of cement slurry: Add cement, UEA expansion agent and FDN water reducer to the mixing tank, and finally add water, wherein the water-cement ratio W/C is less than or equal to 0.50; 8% to 12%; FDN water reducer content accounts for 0.2% to 1% of the mass of the cementitious material;

Step 4: Grouting: inject cement slurry into the space surrounded by the template or the riprap gap in the hole of the cast-in-place pile, and keep the cement slurry liquid level higher than the top of the stone during the initial setting time of the cement slurry;

Step 5: For structural components with a height of less than 3 meters, grout after being filled with stones once; for structural components with a height greater than 3 meters, repeat layered construction according to steps 1 to 4, and the height of each layer should be limited to Within 3 meters. After the grouting of the previous layer is completed, when the grout is close to the initial setting, start to throw in the subsequent stones, and then grout until the construction reaches the design height.

The beneficial effects of the present invention are:

1. The method of the present invention has simple construction technology, fast construction speed, and does not require complex construction machinery.

2. The cement slurry has good fluidity and steel permeability, which reduces the requirements for concrete fluidity, slump and other working performance.

3. The cement slurry has good reinforcement permeability, so that the maximum particle size of the stone is less than or equal to 3/4 of the minimum size of the component section. The crushing workload in the process of forming coarse aggregate is reduced. Larger volumes of waste concrete can also be thrown in as generalized stones and then grouted to form recycled concrete.

4. The riprap grouting concrete can be applied to various large-volume concrete projects, such as large-diameter pile foundations, raft foundations, and large-diameter pile-raft foundations.

detailed description

Specific embodiment one: the preparation method of riprap grouting concrete described in this embodiment is carried out according to the following steps:

Step 1: Preparatory work: According to the construction requirements, formwork or cast-in-situ piles are formed into holes, and steel bars are bound according to the construction requirements;

Step 2: Throwing stones: Throwing stones into the space surrounded by the template or into the hole of the cast-in-place pile;

Step 3: Preparation of cement slurry: Add cement, UEA expansion agent and FDN water reducer to the mixing tank, and finally add water, wherein the water-cement ratio W/C is less than or equal to 0.50; 8% to 12%; FDN water reducer content accounts for 0.2% to 1% of the mass of the cementitious material;

Step 4: Grouting: inject cement slurry into the space surrounded by the template or the riprap gap in the hole of the cast-in-place pile, and keep the cement slurry liquid level higher than the top of the stone during the initial setting time of the cement slurry;

Step 5: For structural components with a height of less than 3 meters, grout after being filled with stones once; for structural components with a height greater than 3 meters, repeat layered construction according to steps 1 to 4, and the height of each layer should be limited to Within 3 meters. After the grouting of the previous layer is completed, when the grout is close to the initial setting, start to throw in the subsequent stones, and then grout until the construction reaches the design height.

Specific implementation mode two: the preparation method of riprap grouting concrete described in this implementation mode, throwing stones in the step two is any one of ordinary stones, waste concrete blocks or a combination of several materials, and others are the same as in specific embodiment one same.

Specific embodiment three: the preparation method of riprap grouted concrete described in this embodiment, the maximum size of ordinary stones or waste concrete blocks in said step 2 should be less than or equal to 3/4 of the minimum size of the cross-section of the poured member, other It is the same as the specific embodiment 1 or 2.

Claims (3)

1. the preparation method of jackstone grouting concrete, it is characterised in that: described method realizes according to following steps；

Step one: preparation: carry out formwork or pouring pile hole according to construction requirement, according to construction requirement assembling reinforcement；

Step 2: throw in stone: throw in stone in template enclosed space or pouring pile hole；

Step 3: the preparation of cement mortar: cement, UEA extender and FDN water reducer are all added in stirring pool, finally Adding water, wherein ratio of mud W/C is less than or equal to 0.50；UEA bulking agent levels accounts for the 8%～12% of Binder Materials quality；FDN Reduced water content accounts for the 0.2%～1% of Binder Materials quality；

Step 4: slip casting: inject cement mortar in the jackstone space in template enclosed space or pouring pile hole, at cement mortar Presetting period in, keep cement mortar liquid level higher than stone top；

Step 5: for height structural elements within 3 meters, uses and once throws full stone grouting behind shaft or drift lining；For being highly more than Within the structural elements of 3 meters, carries out repeating construction in layer according to step one to step 4, and every floor height should be limited to 3 meters, After preceding layer slip casting terminates, when cement mortar closes on initial set, start to be thrown into follow-up stone, then slip casting, until construction is to setting Meter height.

The preparation method of jackstone grouting concrete the most according to claim 1, it is characterised in that: described step 2 is thrown in Stone is common stone or waste concrete block.

The preparation method of jackstone grouting concrete the most according to claim 2, it is characterised in that: common in described step 2 The full-size of stone or waste concrete block should be less than 3/4 of the cross section minimum dimension equal to the component poured.