Light foamed soil for abutment back backfilling and construction method

Abstract

The invention discloses a light foamed soil for abutment back backfilling. The light foamed soil comprises cement, a mixed material, water, a conditioning agent, a foaming agent, a micro-foam agent, and a waterproof agent. The invention also provides a preparation method of light foamed soil for abutment back backfilling. The micro-foam agent is prepared into foams by a plunger pump and an air compressor, the materials are mixed and stirred by a stirrer, and the slurry extraction speed is controlled by a frequency converter so as to control the volume weight of the finished product. The invention also provides an on-site construction method of light foamed soil applied to abutment back backfilling. The light foamed soil provided by the invention belongs to light materials, has small foundation load after filling, greatly reduces the foundation treatment intensity, and saves the foundation treatment duration. After pouring and before initial setting, light foamed soil has very good fluidity and fill self-compaction, avoids the defect of non-full filling of conventional fillers, has strong constructability, and can effectively solve the phenomenon of bumping at bridge head.

Description

technical field

[0001] The invention relates to the technical field of roads and bridges, in particular to a lightweight foam soil applied to the backfill of abutments and a construction method. Background technique

[0002] The vehicle jumping at the bridge head is due to the differential settlement at the bridge head and the expansion joint (bridge head approach road) or the damage of the expansion joint, which causes the steps on the longitudinal slope of the road surface to cause the vehicle to jump when passing. A certain degree of settlement fracture (the settlement value is generally 10-30cm, and some even exceed 60cm), which will cause jumps and impacts when the vehicle passes, thereby causing additional impact loads on the bridge and road surface, making drivers and passengers feel bumpy and uncomfortable, and even causing The vehicle decelerates significantly, which can lead to serious traffic accidents (especially vehicle mechanical accidents). Therefore, the pro...

Examples

Embodiment 1

[0050] A lightweight foam soil used for backfilling of abutments, comprising the following components by weight: cement: 350 parts, mixed material: 80 parts, water: 120 parts, regulator: 35 parts, foaming agent: 10 parts , microfoam agent: 6 parts, waterproofing agent: 5 parts.

[0051] The mixed material in this example includes granulated blast furnace slag.

[0052] The conditioner in this embodiment includes water reducer, rubber powder, reinforcing agent and foam stabilizer.

[0053] In this embodiment, the blowing agent is hydrogen peroxide.

[0054] The cement used in this example is PC42.5 cement, and the microfoaming agent is prepared by diluting the foaming agent and water at a ratio of 1:2000 and microfoaming by a plunger pump.

[0055] The waterproofing agent described in this embodiment includes an inorganic aluminum salt waterproofing agent.

Embodiment 2

[0057] A lightweight foam soil used for backfilling of abutments, comprising the following components by weight: cement: 220 parts, mixed material: 40 parts, water: 180 parts, regulator: 40 parts, foaming agent: 14 parts , microfoam agent: 8 parts, waterproofing agent: 5 parts.

[0058] The mixed material in this embodiment includes coal gangue.

[0059] The conditioner in this embodiment includes water reducer, rubber powder, reinforcing agent and foam stabilizer.

[0060] In this embodiment, the blowing agent is magnesium oxide.

[0061] The cement used in this example is PC42.5 cement, and the microfoaming agent is prepared by diluting the foaming agent and water at a ratio of 1:2000 and microfoaming by a plunger pump.

[0062] The waterproofing agent described in this embodiment includes an inorganic aluminum salt waterproofing agent.

Embodiment 3

[0064] A lightweight foam soil used for backfilling abutments, comprising the following components by weight: cement: 300 parts, mixed material: 70 parts, water: 150 parts, regulator: 35 parts, foaming agent: 12 parts , microfoam agent: 7 parts, waterproofing agent: 6 parts.

[0065] The mixed material in this embodiment includes carbide slag.

[0066] The conditioner in this embodiment includes water reducer, rubber powder, reinforcing agent and foam stabilizer.

[0067] In this embodiment, the blowing agent is hydrogen peroxide.

[0068] The cement used in this example is PC42.5 cement, and the microfoaming agent is prepared by diluting the foaming agent and water at a ratio of 1:2000 and microfoaming by a plunger pump.

[0069] The waterproofing agent described in this embodiment includes an inorganic aluminum salt waterproofing agent.

technical field

[0001] The invention relates to the technical field of roads and bridges, in particular to a lightweight foam soil applied to the backfill of abutments and a construction method. Background technique

[0002] The vehicle jumping at the bridge head is due to the differential settlement at the bridge head and the expansion joint (bridge head approach road) or the damage of the expansion joint, which causes the steps on the longitudinal slope of the road surface to cause the vehicle to jump when passing. A certain degree of settlement fracture (the settlement value is generally 10-30cm, and some even exceed 60cm), which will cause jumps and impacts when the vehicle passes, thereby causing additional impact loads on the bridge and road surface, making drivers and passengers feel bumpy and uncomfortable, and even causing The vehicle decelerates significantly, which can lead to serious traffic accidents (especially vehicle mechanical accidents). Therefore, the pro...

Examples

Embodiment 1

[0050] A lightweight foam soil used for backfilling of abutments, comprising the following components by weight: cement: 350 parts, mixed material: 80 parts, water: 120 parts, regulator: 35 parts, foaming agent: 10 parts , microfoam agent: 6 parts, waterproofing agent: 5 parts.

[0051] The mixed material in this example includes granulated blast furnace slag.

[0052] The conditioner in this embodiment includes water reducer, rubber powder, reinforcing agent and foam stabilizer.

[0053] In this embodiment, the blowing agent is hydrogen peroxide.

[0054] The cement used in this example is PC42.5 cement, and the microfoaming agent is prepared by diluting the foaming agent and water at a ratio of 1:2000 and microfoaming by a plunger pump.

[0055] The waterproofing agent described in this embodiment includes an inorganic aluminum salt waterproofing agent.

Embodiment 2

[0057] A lightweight foam soil used for backfilling of abutments, comprising the following components by weight: cement: 220 parts, mixed material: 40 parts, water: 180 parts, regulator: 40 parts, foaming agent: 14 parts , microfoam agent: 8 parts, waterproofing agent: 5 parts.

[0058] The mixed material in this embodiment includes coal gangue.

[0059] The conditioner in this embodiment includes water reducer, rubber powder, reinforcing agent and foam stabilizer.

[0060] In this embodiment, the blowing agent is magnesium oxide.

[0061] The cement used in this example is PC42.5 cement, and the microfoaming agent is prepared by diluting the foaming agent and water at a ratio of 1:2000 and microfoaming by a plunger pump.

[0062] The waterproofing agent described in this embodiment includes an inorganic aluminum salt waterproofing agent.

Embodiment 3

[0064] A lightweight foam soil used for backfilling abutments, comprising the following components by weight: cement: 300 parts, mixed material: 70 parts, water: 150 parts, regulator: 35 parts, foaming agent: 12 parts , microfoam agent: 7 parts, waterproofing agent: 6 parts.

[0065] The mixed material in this embodiment includes carbide slag.

[0066] The conditioner in this embodiment includes water reducer, rubber powder, reinforcing agent and foam stabilizer.

[0067] In this embodiment, the blowing agent is hydrogen peroxide.

[0068] The cement used in this example is PC42.5 cement, and the microfoaming agent is prepared by diluting the foaming agent and water at a ratio of 1:2000 and microfoaming by a plunger pump.

[0069] The waterproofing agent described in this embodiment includes an inorganic aluminum salt waterproofing agent.