CN104727206A - Soft subgrade grouting treatment constructing method - Google Patents

Abstract

The invention discloses a soft subgrade grouting treatment constructing method. The method includes steps of construction preparation, lofting, drill in-place arrangement, high-pressure pump drilling starting, cement slurry preparation, drill rod lifting, rotation and slurry spraying, washing, displacement, slurry treatment, technical parameter determination and construction abnormality treatment. The original jet flow parameters and nozzle by the high-pressure spraying injection method are improved partially, the construction period is shortened, the soft subgrade is reinforced, the bearing capability of composite subgrade is improved significantly, the requirements on construction quality are met, and the fine social benefits and economic benefits are gained.

Description

Weak subgrade injecting treatment construction method

Technical field

The present invention relates to a kind of weak subgrade injecting treatment construction method.

Background technology

Along with the fast development of engineering construction, construction land day is becoming tight, reinforcement and strengthening is obtained for making soft layer, to meet the intensity of upper part work to ground, high pressure jet grouting consolidation process road foundation technology has that reinforcing body intensity is high, uniform quality, controlled shape, bearing capacity of foundation soil improves, and is applied to the engineering soft layers such as highway, municipal administration, water conservancy gradually and reinforces.

Summary of the invention

A kind of construction period is the object of the present invention is to provide to shorten, the weak subgrade injecting treatment construction method that after Reinforcement of Soft Soil Subgrade, Bearing Capacity of Composite Foundation significantly improves.

Technical solution of the present invention is:

A kind of weak subgrade injecting treatment construction method, is characterized in that: comprise the following steps:

(1) preparation of construction

(a) technique preparation:

According to the requirement of construction design drawing, adjust engineering quantity, establishment constructure scheme; Safety education and technical annotation in construction are carried out to the personnel participating in construction.Carry out technology to construction area to know the real situation, comprising: original ground absolute altitude; The position relationship of adjacent structure, circuit and construction area;

B () levelling of the land and pioneer road: smooth construction plant, weed a garden, surface dust.Reasonable Arrangement pioneer road, can supply goods and materials in time and keep levelling of the land clean;

C () experimental examination: the experiment completing raw-material inspection and simulated mud, tentatively determines construction equipment parameter;

(2) setting-out

First lay out pile in conjunction with drawing and field condition, subregion, numbering; Then surveying and locating goes out the stake of construction area border, releases other positions according to border stake and drawing, and indicates with short bamboo pole and lime;

(3) driller insertion

After driller insertion, center, drill bit align piles position, corrects rig with spirit level and makes drilling rod vertical; Then by stable for rig adjustment, prevent rig to be shifted, depart from Zhuan Wei center;

(4) open high-pressure hydraulic pump to creep into

Rig corrects fixing, and after drill bit centering, open air compressor machine, low-pressure pump, high-pressure hydraulic pump, after running well, aspirated and water sending in hole, simultaneously sinking rod boring pore-forming, until projected depth; Run of steel is determined in advance, to ensure absolute altitude at the bottom of a top mark and stake;

(5) cement grout is prepared

Cement grout preparation is carried out with boring simultaneously, is used while allocating, the match ratio strict measurement that the cement of slurries, water and adulterating agent must be determined by laboratory test and on-the-spot test pile, adopts the even mixing of pulper; Slurries mixing time in mixer is not less than eight minutes;

The cement grout that mixing is good has to pass through filtration, and removing lump, sandstone, in order to avoid blocking pipeline and nozzle; The slurries prepared are the round-the-clock stirring of palpus in churning process, prevents precipitation;

(6) promote drilling rod, rotate whitewashing

Treating that pore-forming arrives projected depth, slurry mixing good cement grout impouring aggregate bin, sending slurry unlatching to send stock pump to send slurry by sending water to change into low-lift pump, enough cement slurry volumes are had for ensureing that stake is low, answer stop-spraying 35 seconds kinds, then rotation limit in limit promotes, till design stake top mark height.

(7), clean, be shifted

After whitewashing pile terminates, propose drilling rod, send stock pump by clean water, drilling rod and stock line etc. simultaneously, be then displaced to the operation of new bore position;

(8) mud conditioning: scene is built by laying bricks or stones or excavated mud pit, mud is transported outward;

(9) determination of technical data

By the construction of test pile, debug in each construction parameter scope of design, finally determine the formal construction parameter in soil property situation at the scene; Each important technological parameters scope is as follows:

(a) jet groutinl pressure and nozzle

Reinforced soft soil ground Grouting Pipe is single pipe method, and its nozzle diameter is 2.5mm ~ 4.5mm, and its pressure is 22 Mpa ~ 40Mpa;

B () sprays hoisting velocity

Adopt 20 ~ 25cm/min;

C () sprays rotary speed: 25r/min;

(d) slurry water gray scale: adopt 1:1 ~ 1.5:1 during rotary jet grouting;

(10) construction abnormality processing

Stop for some reason in (a) formation of pile, Grouting Pipe should be sunk down into 0.5m place, below disconnected slurry face, lifting of whitewashing again during whitewashing to be restored; If shut down more than 3 hours, should grout pipe line be dismantled, clean up, in side, former stake position piling;

Occur in (b) slip casting process again that pressure suddenly rises or declines, a large amount of grout situation time, stop promoting and slip casting, in case section stake;

C, in () lifting process, as occurred, drilling rod or drill bit come off, will left in part in time and propose, then piling is carried out on side.

The present invention passes through parameter and the nozzle of the original jet grounting injection stream of local improvement, and the construction period shortens, and after Reinforcement of Soft Soil Subgrade, Bearing Capacity of Composite Foundation significantly improves, and meets the requirement of construction quality, has good Social benefit and economic benefit.

As the high pressure jet grouting technique of ground stabilization and Foundation Anti-seepage, adopt and improve the single fixing sprayed construction parameter of original high pressure jet grouting technique and burner design, make slurries become non-single, suitable high pressure nozzle jet, obtain the reinforcing body of packed uniform.This method has that reinforcing body intensity is high, reinforcing body controlled shape, the advantage that Bearing Capacity of Composite Foundation significantly improves.

Be applicable to the soft layer consolidation process such as artificial earth fill, sandy soil, cohesive soil, mud, mucky soil, be also applicable to existing building, bridge pier, deep foundation ditch, dyke building, underground construction ground stabilization.

Below in conjunction with embodiment, the invention will be further described.

Detailed description of the invention

A kind of weak subgrade injecting treatment construction method, comprises the following steps:

(1) preparation of construction

(a) technique preparation:

According to the requirement of construction design drawing, adjust engineering quantity, establishment constructure scheme; Safety education and technical annotation in construction are carried out to the personnel participating in construction.Carry out technology to construction area to know the real situation, comprising: original ground absolute altitude; The position relationship of adjacent structure, circuit and construction area;

B () levelling of the land and pioneer road: smooth construction plant, weed a garden, surface dust.Reasonable Arrangement pioneer road, can supply goods and materials in time and keep levelling of the land clean;

C () experimental examination: the experiment completing raw-material inspection and simulated mud, tentatively determines construction equipment parameter;

(2) setting-out

First lay out pile in conjunction with drawing and field condition, subregion, numbering; Then surveying and locating goes out the stake of construction area border, releases other positions according to border stake and drawing, and indicates with short bamboo pole and lime;

(3) driller insertion

After driller insertion, center, drill bit align piles position, corrects rig with spirit level and makes drilling rod vertical; Then by stable for rig adjustment, prevent rig to be shifted, depart from Zhuan Wei center;

(4) open high-pressure hydraulic pump to creep into

Rig corrects fixing, and after drill bit centering, open air compressor machine, low-pressure pump, high-pressure hydraulic pump, after running well, aspirated and water sending in hole, simultaneously sinking rod boring pore-forming, until projected depth; Run of steel is determined in advance, to ensure absolute altitude at the bottom of a top mark and stake;

(5) cement grout is prepared

Cement grout preparation is carried out with boring simultaneously, is used while allocating, the match ratio strict measurement that the cement of slurries, water and adulterating agent must be determined by laboratory test and on-the-spot test pile, adopts the even mixing of pulper; Slurries mixing time in mixer is not less than eight minutes;

The cement grout that mixing is good has to pass through filtration, and removing lump, sandstone, in order to avoid blocking pipeline and nozzle; The slurries prepared are the round-the-clock stirring of palpus in churning process, prevents precipitation;

(6) promote drilling rod, rotate whitewashing

Treating that pore-forming arrives projected depth, slurry mixing good cement grout impouring aggregate bin, sending slurry unlatching to send stock pump to send slurry by sending water to change into low-lift pump, enough cement slurry volumes are had for ensureing that stake is low, answer stop-spraying 35 seconds kinds, then rotation limit in limit promotes, till design stake top mark height.

(7), clean, be shifted

After whitewashing pile terminates, propose drilling rod, send stock pump by clean water, drilling rod and stock line etc. simultaneously, be then displaced to the operation of new bore position;

(8) mud conditioning: scene is built by laying bricks or stones or excavated mud pit, mud is transported outward;

(9) determination of technical data

By the construction of test pile, debug in each construction parameter scope of design, finally determine the formal construction parameter in soil property situation at the scene; Each important technological parameters scope is as follows:

(a) jet groutinl pressure and nozzle

Reinforced soft soil ground Grouting Pipe is single pipe method, and its nozzle diameter is 2.5mm ~ 4.5mm, and its pressure is 22 Mpa ~ 40Mpa;

B () sprays hoisting velocity

Adopt 20 ~ 25cm/min;

C () sprays rotary speed: 25r/min;

(d) slurry water gray scale: adopt 1:1 ~ 1.5:1 during rotary jet grouting;

(10) construction abnormality processing

Stop for some reason in (a) formation of pile, Grouting Pipe should be sunk down into 0.5m place, below disconnected slurry face, lifting of whitewashing again during whitewashing to be restored; If shut down more than 3 hours, should grout pipe line be dismantled, clean up, in side, former stake position piling;

Occur in (b) slip casting process again that pressure suddenly rises or declines, a large amount of grout situation time, stop promoting and slip casting, in case section stake;

C, in () lifting process, as occurred, drilling rod or drill bit come off, will left in part in time and propose, then piling is carried out on side.

Claims (1)

1. a weak subgrade injecting treatment construction method, is characterized in that: comprise the following steps:

(1) preparation of construction

(a) technique preparation:

According to the requirement of construction design drawing, adjust engineering quantity, establishment constructure scheme; Safety education and technical annotation in construction are carried out to the personnel participating in construction.Carry out technology to construction area to know the real situation, comprising: original ground absolute altitude; The position relationship of adjacent structure, circuit and construction area;

B () levelling of the land and pioneer road: smooth construction plant, weed a garden, surface dust.Reasonable Arrangement pioneer road, can supply goods and materials in time and keep levelling of the land clean;

C () experimental examination: the experiment completing raw-material inspection and simulated mud, tentatively determines construction equipment parameter;

(2) setting-out

First lay out pile in conjunction with drawing and field condition, subregion, numbering; Then surveying and locating goes out the stake of construction area border, releases other positions according to border stake and drawing, and indicates with short bamboo pole and lime;

(3) driller insertion

After driller insertion, center, drill bit align piles position, corrects rig with spirit level and makes drilling rod vertical; Then by stable for rig adjustment, prevent rig to be shifted, depart from Zhuan Wei center;

(4) open high-pressure hydraulic pump to creep into

Rig corrects fixing, and after drill bit centering, open air compressor machine, low-pressure pump, high-pressure hydraulic pump, after running well, aspirated and water sending in hole, simultaneously sinking rod boring pore-forming, until projected depth; Run of steel is determined in advance, to ensure absolute altitude at the bottom of a top mark and stake;

(5) cement grout is prepared

Cement grout preparation is carried out with boring simultaneously, is used while allocating, the match ratio strict measurement that the cement of slurries, water and adulterating agent must be determined by laboratory test and on-the-spot test pile, adopts the even mixing of pulper; Slurries mixing time in mixer is not less than eight minutes;

The cement grout that mixing is good has to pass through filtration, and removing lump, sandstone, in order to avoid blocking pipeline and nozzle; The slurries prepared are the round-the-clock stirring of palpus in churning process, prevents precipitation;

(6) promote drilling rod, rotate whitewashing

Treating that pore-forming arrives projected depth, slurry mixing good cement grout impouring aggregate bin, sending slurry unlatching to send stock pump to send slurry by sending water to change into low-lift pump, enough cement slurry volumes are had for ensureing that stake is low, answer stop-spraying 35 seconds kinds, then rotation limit in limit promotes, till design stake top mark height.

(7), clean, be shifted

After whitewashing pile terminates, propose drilling rod, send stock pump by clean water, drilling rod and stock line etc. simultaneously, be then displaced to the operation of new bore position;

(8) mud conditioning: scene is built by laying bricks or stones or excavated mud pit, mud is transported outward;

(9) determination of technical data

By the construction of test pile, debug in each construction parameter scope of design, finally determine the formal construction parameter in soil property situation at the scene; Each important technological parameters scope is as follows:

(a) jet groutinl pressure and nozzle

Reinforced soft soil ground Grouting Pipe is single pipe method, and its nozzle diameter is 2.5mm ~ 4.5mm, and its pressure is 22 Mpa ~ 40Mpa;

B () sprays hoisting velocity

Adopt 20 ~ 25cm/min;

C () sprays rotary speed: 25r/min;

(d) slurry water gray scale: adopt 1:1 ~ 1.5:1 during rotary jet grouting;

(10) construction abnormality processing

Stop for some reason in (a) formation of pile, Grouting Pipe should be sunk down into 0.5m place, below disconnected slurry face, lifting of whitewashing again during whitewashing to be restored; If shut down more than 3 hours, should grout pipe line be dismantled, clean up, in side, former stake position piling;

Occur in (b) slip casting process again that pressure suddenly rises or declines, a large amount of grout situation time, stop promoting and slip casting, in case section stake;

C, in () lifting process, as occurred, drilling rod or drill bit come off, will left in part in time and propose, then piling is carried out on side.