CN106149751A - Utilize the method that quick lime brick quarrel compaction pile reinforces building construction ground - Google Patents

Abstract

The invention relates to a reinforcement construction method for building foundation treatment, in particular to a method for strengthening the foundation of a building by utilizing quicklime brick ballast compaction piles, using quicklime, brick ballast, soil, and cement as raw materials and pouring into the foundation In the pile hole, the pile hole is formed by impact, and the pile end is compacted with brick ballast. The adopted process is: construction preparation→construction setting out→construction precipitation→impact hole forming→layer pouring→tamping and capping. The percussion drill impacts the hole, and the soil between the piles is compacted during the hole formation process. After mixing quicklime, brick slag, soil, and cement raw materials, they are driven into the pile hole of the foundation soil. The quicklime absorbs water and expands to cause secondary compaction of the soil between the piles. effect, the pile end is rammed with brick ballast, and the brick ballast acts as a hard aggregate, making the pile upright and upright, which can effectively increase the strength of the foundation soil, improve the bearing capacity of the foundation soil, improve the uniformity of the foundation soil, and prevent the foundation from being damaged due to Settlement deformation occurs due to uneven force, low cost, no environmental pollution, and can shorten the construction period.

Description

The Method of Strengthening the Building Foundation by Utilizing Quicklime Brick Dregs Compaction Pile

technical field

The invention belongs to the technical field of foundation reinforcement treatment, and relates to a reinforcement construction method adopted for the foundation treatment of a building, in particular to a method for reinforcing the foundation of a building by using quicklime brick compaction piles.

Background technique

Concrete pouring piles and cement-soil mixing piles have been mostly used in building foundation treatment for many years, but these prior art ubiquitous following shortcoming: 1, engineering cost is relatively high. For example, if the foundation cost of a general 6-story residential building has a bearing capacity of fak=80-l00KPa, the cost of concrete pouring pile foundation is 80 yuan/m2; the foundation cost of cement-soil mixing pile is 45 yuan/m2, and the natural foundation of quicklime brick compaction pile The construction cost is only 30 yuan/m2; it can be seen that the present invention can effectively reduce the cost and ensure the project quality. 2. The construction progress is slow. Because the mechanical equipment used in the prior art is huge and heavy, the construction period is long, the construction cannot be flexible, and it is also limited by the site, water, electricity, fuel, etc., so the construction progress is affected to a certain extent. 3. Pollution and noise. Strong vibrations and noises, mud transportation and stacking have affected the daily life of the surrounding people, resulting in noise pollution, environmental pollution and nuisance. 4. The pile quality is limited. Traditional cast-in-place piles and composite foundation treatment methods are mostly based on friction. During construction, affected by groundwater, soil layers, and pile-forming technology, etc., engineering quality problems such as necking, broken piles, concrete segregation, and excessive sediment thickness are prone to occur.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a foundation soil that can effectively increase the strength of the foundation soil, improve the bearing capacity of the foundation soil, improve the uniformity of the foundation soil, and prevent the foundation from settlement deformation due to uneven force. The invention discloses a method for strengthening the foundation of a building by utilizing quicklime brick slag compaction piles.

The purpose of the present invention is achieved in the following way: a method for reinforcing the foundation of a building by utilizing quicklime brick slag compaction piles, which is characterized in that: quicklime, brick slag, soil, and cement are used as raw materials to be poured into the pile holes of the foundation, and the piles The hole is formed by impact, and the pile end is compacted with brick ballast. The following process is adopted: construction preparation→construction setting out→construction precipitation→impact hole formation→layer pouring→tamping and capping. The specific steps are as follows:

Step 1) Construction preparation: Prepare raw materials and construction equipment: 50-type impact drilling rig, Luoyang shovel, compaction equipment, rammer, water supply and electricity supply;

Step 2) Construction setting out: arrange in square, quincunx or equilateral triangle;

Step 3) Dewatering during construction: In order to ensure the quality of holes and piles, the water level at the construction site should be lowered before construction;

Step 4) Impact hole formation: Use a 50-type impact drill according to the pile position placed, or use a Luoyang shovel to form pile holes when the site is narrow and cannot be mechanically constructed, first at the periphery and then in the middle;

Step 5) Filling in layers: Start filling after the pile diameter and depth meet the design requirements. In order to ensure the bearing capacity of the pile tip, first fill the pile tip with 30 cm thick broken bricks, tamp with a hammer 20-30 times, lift the hammer The height is 80-100cm; after all the broken bricks have entered the surrounding soil, fill in 20 cm of broken brick dregs and tamp l5-20 times; -20 times, the height of the hammer is 80-100cm; the weight ratio of the mixture is: above the groundwater level in the pile hole, the mixture is quicklime: brick ballast: soil = 1: l: 2, below the groundwater level in the pile hole , the mixture uses quicklime: cement: brick ballast: soil = 1:0.5:1:3;

Step 6) Ramming and capping: the capping layer shall be rammed and filled with plain soil to the ground to seal the hole, the thickness shall not be less than 30 cm.

In step 5), before filling the hole, the bottom of the hole should be compacted, and the diameter, depth and verticality of the pile hole should be checked by sampling; the verticality deviation of the pile hole should not be greater than 1.5%; after passing the inspection, it should be in accordance with the design requirements Fill the well-mixed mixture into the hole layer by layer.

When processing the whole piece, it is carried out at intervals of 1-2 holes from the inside or the middle to the outside. For large-scale projects, the construction is carried out in sections. , use squares, rectangles or isosceles triangles for individual foundations or strip foundations.

After the above steps are completed, foundation detection and inspection are required: specifically, excavation inspection, static penetration test or standard penetration test, portable penetration test, and vertical compressive load test are used for inspection according to engineering requirements and local experience. , and should be combined with engineering testing and observation data to comprehensively evaluate the reinforcement effect; construction testing should be carried out 7-10 days after construction.

When the static penetration test, standard penetration test, and portable penetration test are used for detection, the detection site is the pile center and the soil between the piles, and every two points are a group, and the number of detection groups should meet the design requirements; Satisfy the test load conditions and carry out 28 days after pile formation.

The invention arranges holes around the foundation, impacts the holes with a percussion drill, and compacts the soil between the piles during the hole forming process, then mixes quicklime, brick ballast, soil, cement and other raw materials in a certain proportion, and drives them into the foundation soil After the quicklime absorbs water and expands, the soil between the piles will undergo a secondary compaction effect, and the pile ends will be compacted with brick ballast, which acts as a hard aggregate to make the pile stand upright. The artificial foundation that bears the load jointly with the body can effectively increase the strength of the foundation soil, improve the bearing capacity of the foundation soil, improve the uniformity of the foundation soil, and prevent the foundation from settlement deformation due to uneven force. The utility model has the advantages of low cost, no environmental pollution, and can shorten the construction period. It has good economic benefits, social benefits and environmental benefits, and has a large development space in the construction and development of small and medium-sized cities in my country, especially for the treatment and application of multi-storey building foundations.

detailed description

The specific method of the present invention is to arrange holes around the foundation of the building to be built, and impact the holes with a percussion drill. After being mixed in proportion and driven into the pile hole of the foundation soil, the quicklime absorbs water and expands to cause a secondary compaction effect on the soil between the piles. The formed artificial foundation, which is jointly borne by the foundation soil and the reinforcement, can effectively increase the strength of the foundation soil, improve the bearing capacity of the foundation soil, improve the uniformity of the foundation soil, and prevent the settlement and deformation of the foundation due to uneven force. .

The quicklime brick ballast compacted pile composite foundation of the present invention is called compact quicklime pile for short. It uses quicklime, brick ballast, soil, and cement as raw materials. After mixing them in a certain proportion, they are poured into the pile holes of the foundation. hole, the machine is a 50-type drilling rig produced by Jiamusi, and the pile ends are compacted with brick ballast. Because the impact hole is used, the soil between the piles is compacted. The effect of hard aggregate makes the pile body upright and straight, forming an artificial foundation that bears the load jointly by the foundation soil and the reinforcement. It can effectively increase the strength and uniformity of the foundation, improve the bearing capacity of the foundation, so as to meet the requirements of foundation design. The following technological process is adopted: construction preparation→construction setting out→construction precipitation (when the groundwater table is relatively shallow)→impact hole formation→layered pouring→tamping and capping. The specific implementation steps are as follows:

Step 1) Construction preparation: ① Raw materials are prepared and processed according to the requirements of various indicators for use. ②Preparation of construction equipment: Type 50 impact drilling rig, Luoyang shovel, compaction equipment, rammer (weight about 12.5kg), etc. ③ Connect water and electricity.

Step 2) Construction setting out: arrange in square, quincunx or equilateral triangle;

Step 3) Precipitation during construction: In order to ensure the quality of holes and piles, the water level at the construction site should be lowered before construction; therefore, if the groundwater level is shallow, precipitation should be carried out before construction to ensure the quality of holes and piles.

Step 4) Impact hole formation: Use a 50-type impact drill according to the pile position placed, or use a Luoyang shovel to form pile holes when the site is narrow and cannot be mechanically constructed, first at the periphery and then in the middle;

Step 5) Filling in layers: Start filling after the pile diameter and depth meet the design requirements,

①In order to ensure the bearing capacity of the pile end, the pile end is first filled with 30 cm thick broken bricks, rammed with a hammer for 20-30 times, and the height of the hammer is 80-100cm;

② After all the broken bricks have entered the surrounding soil, fill in 20 cm of broken brick ballast and tamp 15-20 times;

③After the pile end is compacted, pour the mixture into the pile hole, pave the thickness of 30cm, tamp 15-20 times, lift the hammer height 80-100cm; the weight ratio of the mixture is: above the groundwater level in the pile hole, the mixture Quicklime: brick ballast: soil = 1: l: 2, below the groundwater level in the pile hole, quicklime: cement: brick ballast: soil = 1:0.5:1:3;

Step 6) Tamping and capping: use a hammer to compact the layers to the design elevation, and then cap the roof, and then ram and fill the roof with plain soil layer by layer to seal the hole on the ground, with a thickness of not less than 30 cm.

In step 5), before filling the hole, the bottom of the hole should be compacted, and the diameter, depth and verticality of the pile hole should be checked by sampling; the verticality deviation of the pile hole should not be greater than 1.5%; after passing the inspection, it should be in accordance with the design requirements Fill the well-mixed mixture into the hole layer by layer.

When processing the whole piece, it is carried out at intervals of 1-2 holes from the inside or the middle to the outside. For large-scale projects, the construction is carried out in sections. , use squares, rectangles or isosceles triangles for individual foundations or strip foundations.

After the above steps are completed, foundation detection and inspection are required: specifically, excavation inspection, static penetration test or standard penetration test, portable penetration test, and vertical compressive load test are used for inspection according to engineering requirements and local experience. , and should be combined with engineering testing and observation data to comprehensively evaluate the reinforcement effect; construction testing should be carried out 7-10 days after construction.

When the static penetration test, standard penetration test, and portable penetration test are used for detection, the detection site is the pile center and the soil between the piles, and every two points are a group, and the number of detection groups should meet the design requirements; Satisfy the test load conditions and carry out 28 days after pile formation.

Construction points and precautions:

1. Construction points:

①In order to ensure the bearing capacity of the pile end, first fill the pile end with 30cm thick broken bricks, ram it with a hammer for 20-30 times, and lift the hammer height to 80-100cm;

② If all the broken bricks have entered the surrounding soil, fill in 20cm of broken bricks and tamp 15-20 times;

③ After the pile ends are compacted, mix the mixture (according to a certain weight ratio of quicklime: brick ballast: soil = 1: 1: 2 and quicklime: cement: brick ballast: soil = 1: 0.5: 1: 3 (mainly used for Underwater)) Fill in the hole, pave the thickness of about 30cm, tamp l5---20 times, lift the hammer height 80--100cm.

④The roof shall be filled with plain soil layer by layer to seal the hole on the ground, the thickness shall not be less than 30cm.

2. Matters needing attention:

①Before filling the hole, the bottom of the hole should be compacted, and the diameter, depth and verticality of the pile hole should be checked by sampling;

②The vertical deviation of the pile hole should not be greater than 1.5%;

③ After passing the inspection, the well-fitted mixture should be filled into the hole layer by layer according to the design requirements;

④ When processing the whole piece, it should be carried out from the inside (or the middle) to the outside at intervals of 1-2 holes. Segmented construction can be adopted for large-scale projects. When local treatment is carried out, it should be carried out at intervals of 1-2 holes from the outside to the inside;

⑤ Equilateral triangles should be used for large-area satisfactory treatment, and square, rectangular or isosceles triangle arrangements should be used for individual foundations or strip foundations.

3. Pile test:

3.1 Composite foundation detection and inspection can be carried out by means of excavation inspection, static penetration or standard penetration, portable penetration test, vertical compressive load test and other methods according to engineering requirements and local experience, and should be combined with engineering testing and observation Comprehensive evaluation of reinforcement effect based on data. Construction testing should be carried out 7-10 days after construction.

3.2 When the static penetration test, standard penetration test, and portable penetration test are used for detection, the detection site should be the pile center and the soil between the piles, and every two points should be a group. The number of detection groups should meet the design requirements.

3.3 The load test should be carried out after the pile strength meets the test load conditions and 28 days after the pile is formed. The number of tests shall meet the design requirements.

Claims (5)

1. A method of utilizing quicklime brick slag compaction piles to reinforce the building foundation is characterized in that: quicklime, brick slag, soil and cement are used as raw materials to be poured into the pile holes of the foundation, and the pile holes adopt impact forming holes, and the piles The end is compacted with brick ballast, and the following process is adopted: construction preparation → construction setting out → construction dewatering → impact hole formation → layered pouring → compaction and capping, the specific steps are as follows: Step 1) Construction preparation: Prepare raw materials and construction equipment: 50-type impact drilling rig, Luoyang shovel, compaction equipment, rammer, water supply and electricity supply; Step 2) Construction setting out: arrange in square, quincunx or equilateral triangle; Step 3) Dewatering during construction: In order to ensure the quality of holes and piles, the water level at the construction site should be lowered before construction; Step 4) Impact hole formation: Use a 50-type impact drill according to the pile position placed, or use a Luoyang shovel to form pile holes when the site is narrow and cannot be mechanically constructed, first at the periphery and then in the middle; Step 5) Filling in layers: Start filling after the pile diameter and depth meet the design requirements. In order to ensure the bearing capacity of the pile tip, first fill the pile tip with 30 cm thick broken bricks, tamp with a hammer 20-30 times, lift the hammer The height is 80-100cm; after all the broken bricks have entered the surrounding soil, fill in 20 cm of broken brick dregs and tamp l5-20 times; -20 times, the height of the hammer is 80-100cm; the weight ratio of the mixture is: above the groundwater level in the pile hole, the mixture is quicklime: brick ballast: soil = 1: l: 2, below the groundwater level in the pile hole , the mixture uses quicklime: cement: brick ballast: soil = 1:0.5:1:3; Step 6) Ramming and capping: the capping layer shall be rammed and filled with plain soil to the ground to seal the hole, the thickness shall not be less than 30 cm. 2. The method of using quicklime brick compaction piles to reinforce building foundations according to claim 1, characterized in that: in step 5), before filling the holes, the bottom of the holes should be compacted, and the pile holes should be sampled and inspected The diameter, depth and verticality of the pile hole; the verticality deviation of the pile hole is not more than 1.5%; after passing the inspection, the well-matched mixture should be filled into the hole layer by layer according to the design requirements. 3. The method of utilizing quicklime brick slag compaction piles to reinforce the building foundation according to claim 1, characterized in that: when the whole piece is processed, it is carried out at intervals of 1-2 holes from the inside or the middle to the outside, and large-scale projects are divided into Sectional construction, when local treatment is carried out, it is carried out from the outside to the inside at intervals of 1-2 holes; for a large area, an equilateral triangle is used for the treatment, and a square, rectangle or isosceles triangle is used for a single foundation or a strip foundation. 4. The method of utilizing quicklime brick slag compaction piles to reinforce the building foundation according to claim 1 is characterized in that: after the above-mentioned steps are completed, foundation detection and inspection are also required: specifically, according to engineering requirements and local experience, the method of developing Excavation inspection, static penetration test or standard penetration test, portable penetration test, and vertical compressive load test methods shall be used for inspection, and the reinforcement effect shall be comprehensively evaluated in combination with engineering tests and observation data; construction inspection shall be carried out 7-10 days after construction conduct. 5. The method according to claim 4, characterized in that: when using static penetration test or standard penetration test or light penetration test to detect, the detection position is the center of the pile. And the soil between the piles, every two points is a group, and the number of detection groups should meet the design requirements; the load test should be carried out after the pile body strength meets the test load conditions and 28 days after the pile is formed.