CN103242009B - A kind of abutment infiltration material non-fine concrete block and manufacture craft thereof - Google Patents

Abstract

The invention discloses a sandless concrete block for a bridge abutment seepage material, which is characterized in that it is made by mixing cement, water and stones according to the following weight composition ratio: 1 part of cement, 0.32-0.33 parts of water, and 5.33-0.33 parts of stones 5.55 servings. Its manufacturing process includes the following steps: mixing cement, water and stones evenly with a forced mixer; pouring into a standard template; processing in the template in the order of vibration, molding and maintenance; demoulding. The invention has the following advantages: it is a very good water-permeable material, which can effectively solve the problem that seepage water cannot be discharged in traditional abutment construction; the bulk density is relatively small, which provides convenience for transportation and construction. After the old sandless concrete blocks are broken, they are good coarse aggregates and can be reused.

Description

A bridge abutment seepage material sandless concrete block and its manufacturing process

technical field

The invention relates to a building component and its manufacturing process, in particular to a filling seepage material and its manufacturing process in abutment construction.

Background technique

During the construction of the abutment, the back of the abutment must be filled with water seepage material according to the specification requirements to prevent the bottom of the abutment back from accumulating water. The traditional filling water seepage material is usually graded gravel with +3% cement. This traditional Filling seepage material has the problem that seepage water cannot be discharged, and the guide for subgrade seepage is not fixed, resulting in serious slope erosion in the transition section of the bridge abutment, which has a great impact on the stability of the transition section of the bridge abutment after a long time, and has a great impact on the quality of the project. And economic benefits have a certain impact.

Contents of the invention

The invention provides a bridge abutment seepage material sandless concrete block with low cost, convenient manufacture, good water permeability and certain compressive strength and a manufacturing process thereof.

To achieve the above object, the technical solution of the present invention is:

A sandless concrete block for a bridge abutment water seepage material is characterized in that it is made by mixing cement, water and stones according to the following weight composition ratio:

1 part of cement, 0.33 parts of water, and 5.44 parts of gravel;

Its manufacturing process includes the following steps:

(1) Stir the cement, water and stones evenly with a forced mixer;

(2) Inject the standard template;

(3) Process in the template in the order of vibration, forming and maintenance;

(4) demoulding;

Its installation method includes the following steps:

(1) Coat the prepared waterproof paint on the back of the abutment;

(2) A sand-free concrete blind pipe is buried at the connection between the abutment and the foundation;

(3) Connect two sandless concrete blind pipes of the same type to the back of the abutment on both sides of the abutment to guide water out of the basic body of the road to prevent erosion;

(4) A small retaining wall of 20*30cm is built with concrete for the sand-free concrete blind pipe buried at the bottom to separate the sand-free concrete dead pipe from graded gravel, and sand-free concrete blocks are built on the blind pipe;

(5) Sand-free concrete blocks shall be piled up by plum blossom method.

The particle size of the stones is 9.5-26.5mm.

The vibration time of step (3) in the manufacturing process is 10 minutes.

The molding time of step (3) in the manufacturing process is 1 day.

The curing cycle of step (3) in the manufacturing process is 7 days.

The manufactured sand-free concrete blocks have the following advantages:

(1) The sandless concrete block is an aggregate of coarse aggregate particles, and each coarse aggregate particle is wrapped by a thin layer of cement slurry about 1.0mm thick. Therefore, there are a lot of pores inside the sand-free concrete block, and the size of the pores is roughly equal to the particle size of the coarse aggregate, and water can flow in the pores, so the sand-free concrete block is a good water-permeable material, which can effectively solve the problem of The problem that seepage water cannot be discharged in traditional abutment construction has been significantly improved in economic benefits and engineering quality after it is put into use.

(2) Since there is no fine aggregate in the sand-free concrete block, the total surface area of the aggregate is much smaller than that of ordinary concrete, and the amount of cement used to wrap the aggregate also decreases accordingly, so the bulk density of the sand-free concrete block is relatively small, as Transportation and construction provide convenience.

(3) Since the amount of cement is low and there is no fine aggregate, the cost of the sand-free concrete block itself is relatively low. In addition, the coarse aggregate of sand-free concrete blocks can be crushed stone, ceramsite, or industrial waste such as slag, or even high-strength construction waste, such as bricks, broken concrete blocks, etc., while the old sand-free concrete blocks are broken Finally, it is a very good coarse aggregate, so that the cost of sand-free concrete blocks is greatly reduced, and the utilization of local materials and the waste disposal problems after demolition of old buildings can be satisfactorily solved.

This sand-free concrete block can be widely used in various projects:

(1) Since the sandless concrete block has a large porosity and strong water permeability, it can be installed behind the abutment and combined with the retaining wall to form a composite retaining wall, which is convenient for water seepage at the back of the abutment. The sandless concrete block is used as A part of the wall body of the retaining wall is combined with the geotextile to prevent the loss of backfill earth. Using low-cost sand-free concrete blocks to replace high-cost pebble filter layers in construction can greatly reduce construction costs, and this kind of retaining wall does not need to increase other drainage facilities, thereby saving investment.

(2) Due to the high strength and water permeability of sand-free concrete blocks, when constructing the ditch in the project, a sand-free concrete block is piled on both sides of the ditch, which improves the drainage capacity of the ditch while blocking the scoured soil .

(3) Due to its good strength and water permeability, sand-free concrete blocks can be widely used in municipal engineering. Sand-free concrete blocks can be used for parking lot floors, sidewalks, and some drainage pipe outlets.

detailed description

Make the ingredients according to the following recipe:

Cement 310kg/m ³ , water 102kg/m ³ , gravel 1685kg/m ³ .

Among them, the particle size of crushed stone is 9.5-26.5mm.

The production process is:

(1) Mix cement, water and stones with a 60L forced mixer, and stir evenly with 25L per plate;

(2) Inject the standard template;

(3) Process in the template in the order of vibration, forming and maintenance:

After the concrete is poured into the formwork, put it into the vibrating table and vibrate for 10 minutes; carry out watering maintenance one day after forming, and the maintenance period is 7 days;

(4) Remove the formwork.

A sand-free concrete block with a size of 25*30*15cm is made, and its 28d compressive strength is 23.8Mpa.

Preparations before installing the sand-free concrete block:

(1) Transport the sand-free concrete blocks required for the abutment to the edge of the abutment according to the designed amount.

(2) Clean up the connection between the abutment and the foundation.

(3) Coat the prepared waterproof paint on the back of the abutment.

(4) A sand-free concrete blind pipe is buried at the connection between the abutment and the foundation.

(5) Connect two sandless concrete blind pipes of the same type to the back of the abutment on both sides of the abutment to guide water out of the basic body of the road to prevent erosion.

Installation work of sand-free concrete blocks:

(1) A small retaining wall of 20*30cm is used for the sand-free concrete blind pipe buried at the bottom to separate the sand-free concrete dead pipe from graded gravel, and sand-free concrete blocks are built on the blind pipe.

(2) Sand-free concrete blocks shall be piled up by the plum blossom method, and large gaps and joints shall not appear during the stacking process.

After the installation is completed, the sand-free concrete block and the retaining wall form a combined retaining wall. Using the sand-free concrete block has the characteristics of large porosity and strong water permeability, water flows out along the sand-free concrete block and enters the sand-free concrete The blind pipe leads the water out, which effectively solves the problem of water accumulation at the back of the retaining wall, thereby reducing the horizontal pressure behind the wall.

Claims (5)

1. a bridge abutment seepage material sandless concrete block, is characterized in that: It is made by mixing cement, water, and stones according to the following weight ratio: 1 part of cement, 0.33 parts of water, and 5.44 parts of stones; Its manufacturing process includes the following steps: (1) Stir the cement, water and stones evenly with a forced mixer; (2) Inject the standard template; (3) Process in the template in the order of vibration, forming and maintenance; (4) demoulding; Its installation method includes the following steps: (1) Coat the prepared waterproof paint on the back of the abutment; (2) A sand-free concrete blind pipe is buried at the connection between the abutment and the foundation; (3) Connect two sandless concrete blind pipes of the same type to the back of the abutment on both sides of the abutment to guide water out of the basic body of the road to prevent erosion; (4) A small retaining wall of 20*30cm is built with concrete for the sand-free concrete blind pipe buried at the bottom to separate the sand-free concrete dead pipe from graded gravel, and sand-free concrete blocks are built on the blind pipe; (5) Sand-free concrete blocks shall be piled up by plum blossom method. 2. The sandless concrete block of abutment seepage material according to claim 1, characterized in that: The particle size of the stones is 9.5-26.5mm. 3. The sandless concrete block of abutment seepage material according to claim 1, characterized in that: The vibration time of step (3) in the manufacturing process is 10 minutes. 4. The sandless concrete block of abutment seepage material according to claim 1, characterized in that: The molding time of step (3) in the manufacturing process is 1 day. 5. The sandless concrete block for abutment seepage material according to claim 1, characterized in that: The curing cycle of step (3) in the manufacturing process is 7 days.