CN104264681A - Interior-support-free support method for sluiceway foundation pit of rolling line - Google Patents

Abstract

The invention relates to an interior-support-free support method for a sluiceway foundation pit of a rolling line. The method includes the steps: a, filling pile construction: backwardly moving part of filling piles in each single row of filling piles, and using rigid top beams, coupling beams or middle plates to connect front and rear rows of piles to form a hyperstatic support structure system, wherein the row distance ranges from 3D to 5D, D refers to the diameter of the filling piles, the front-row pile distance is not larger than 2D, and the rear-row pile distance is not larger than 3D; b, basement reinforcement: in soft soil layer construction, adopting duplex high-pressure jet grouting piles for whole basement reinforcement; c, excavation of the foundation pit of the rolling line; d, construction of pile top beams, connection beams or middle plates; e, excavation of the sluiceway foundation pit; f, structural construction. The method has the advantages that construction procedure is simplified, engineering construction progress is accelerated, and integral safety of the foundation pit of the rolling line is benefited.

Description

Rolling line sluice foundation ditch is without inner support supporting method

Technical field

The present invention relates to a kind of without inner support supporting method, rolling line sluice foundation ditch is without inner support supporting method specifically.

Background technology

Sluice foundation ditch is positioned in the middle part of main rolling line foundation ditch, is to cheat in a long and narrow hole, and be about 160m, wide about 4m, the dark 3m ~ 7m of relatively main rolling line foundation ditch, its support pattern is related to the safety of overall foundation ditch, is also related to the construction speed on equipment of hot rolling basis.The supporting method such as the single castinplace pile of usual employing+Guan Liang+~ bis-road steel inner support, steel sheet pile+~ bis-road steel inner support, cement-soil gravity type retaining wall.

During sluice excavation of foundation pit, main foundation ditch has excavated complete, according to the supporting method having inner support, then need to adopt large-scale crane to stand in the peace of carrying out bracing members outside main rolling line foundation ditch and tear operation open, and sluice structure needs according to the vertical layered construction in Support Position, constuction joint needs to take measures of preventing water, operation is loaded down with trivial details, and the construction period is longer; Then more loaded down with trivial details according to steel sheet pile supporting, need in main rolling line foundation ditch, lay temporary road to carry out the beating of steel sheet pile, pull out operation, main rolling line base plate of foundation pit needs could construct after steel sheet pile is extracted, main rolling line structure can not with sluice simultaneous construction, the construction period is very long; According to cement-soil gravity type retaining wall supporting, because other bracing of foundation pit bodies of wall compared by Cement-soil Gravity enclosure wall, Bit andits control ability is more weak, in stream plasticity soft mud, adopt this kind of supporting method engineering risk too large.

Summary of the invention

The present invention is intended to the defect overcoming prior art, provides a kind of rolling line sluice foundation ditch without inner support supporting method, simplifies working procedure, accelerate engineering construction progress, be conducive to the overall security of main rolling line foundation ditch.

In order to solve the problems of the technologies described above, the present invention is achieved in that

A kind of rolling line sluice foundation ditch, without inner support supporting method, is characterized in that: comprise the steps:

A, filling pile construction

Part castinplace pile in single grout pile is moved backward, and at perfusion very useful rigidity Guan Liang, coupling beam or intermediate plate, front and back campshed is coupled together composition static-indeterminant supporting structural system;

The degree of depth of foundation ditch both sides castinplace pile, array pitch and pile spacing is formulated according to the degree of depth of sluice, width and geological condition;

Array pitch is between 3D to 5D, and D is castinplace pile diameter, and front-seat pile spacing is not more than 2D, and rear campshed spacing is not more than 3D;

Select the need of carrying out inter-pile soil body, base reinforcing according to soil body physical and mechanical property, groundwater table situation; When constructing in weak soil soil layer, first carry out the reinforcing of inter-pile soil body, adopt cement mixing pile or high-pressure rotary jet grouting pile, then beat castinplace pile in stake inner sleeve; Filling pile construction adopts slewing drilling machine, Churn drill, rotary drilling rig;

B, bottom stab ilization

When constructing in weak soil soil layer, dual pipe high-pressure rotary jet grouting pile is adopted to carry out full hall bottom stab ilization; This step is not needed when constructing in other soil layers;

C, rolling line excavation of foundation pit

The main foundation ditch sectional excavation of rolling line, and sluice supporting Guan Liang, intermediate plate groove are together dug out;

D, stake apical cap beam, coupling beam or intermediate plate are constructed

According to main pit earthwork sequence of excavation, section construction Guan Liang, intermediate plate, after concrete strength reaches 75% intensity, allow the earthwork in excavation sluice;

E, sluice excavation of foundation pit

In sluice, the earthwork is according to Guan Liang, intermediate plate sequence of construction excavation section by section, and during excavation, digging machine stands on Guan Liang, intermediate plate and has bad luck the earthwork;

F, structure construction

Sluice structure is according to rolling line base plate segmentation situation organizing construction; Vertically construct at twice, base plate of constructing for the first time, absolute altitude at the bottom of second time construction side wall to rolling line sole plate.

The invention has the beneficial effects as follows: this kind of supporting and protection structure lateral rigidity is large, and resistance to overturning is good, and when bearing horizontal loading, displacement is little, moment of flexure is also little, not needing inner support is installed, simplifying working procedure, accelerate construction speed, save large-scale crane cost.

Accompanying drawing explanation

Below in conjunction with drawings and embodiments, the present invention is described in further detail:

Fig. 1 is structural representation of the present invention.

Fig. 2 is sectional drawing of the present invention.

Fig. 3 is the structural representation of castinplace pile and cement mixing pile spacing.

Fig. 4 is the structural representation of Guan Liang and intermediate plate.

Detailed description of the invention

As Figure 1-4: a kind of rolling line sluice foundation ditch, without inner support supporting method, comprises the steps:

A, filling pile construction

Part castinplace pile in single grout pile is moved backward, and at perfusion very useful rigidity hat beam 1, coupling beam or intermediate plate 2, front and back campshed is coupled together composition static-indeterminant supporting structural system;

The degree of depth of foundation ditch both sides castinplace pile, array pitch and pile spacing is formulated according to the degree of depth of sluice, width and geological condition;

Array pitch is between 3D to 5D, and D is castinplace pile diameter, and front campshed 41 spacing is not more than 2D, and rear campshed 42 spacing is not more than 3D;

Select the need of carrying out inter-pile soil body, base reinforcing according to soil body physical and mechanical property, groundwater table situation; When constructing in weak soil soil layer, first carry out the reinforcing of inter-pile soil body, adopt cement mixing pile 3 or high-pressure rotary jet grouting pile, then beat castinplace pile 4 in stake inner sleeve; Filling pile construction adopts slewing drilling machine, Churn drill, rotary drilling rig;

B, bottom stab ilization

When constructing in weak soil soil layer, dual pipe high-pressure rotary jet grouting pile is adopted to carry out full hall bottom stab ilization; This step is not needed when constructing in other soil layers;

C, rolling line excavation of foundation pit

The main foundation ditch sectional excavation of rolling line, and sluice supporting Guan Liang, intermediate plate groove are together dug out;

D, stake apical cap beam, coupling beam or intermediate plate are constructed

According to main pit earthwork sequence of excavation, section construction Guan Liang, intermediate plate, after concrete strength reaches 75% intensity, allow the earthwork in excavation sluice;

E, sluice excavation of foundation pit

In sluice, the earthwork is according to Guan Liang, intermediate plate sequence of construction excavation section by section, and during excavation, digging machine stands on Guan Liang, intermediate plate and has bad luck the earthwork;

F, structure construction

Sluice structure is according to rolling line base plate segmentation situation organizing construction; Vertically construct at twice, base plate of constructing for the first time, absolute altitude at the bottom of second time construction side wall to rolling line sole plate.

Claims (1)

1. rolling line sluice foundation ditch is without an inner support supporting method, it is characterized in that: comprise the steps:

A, filling pile construction

Part castinplace pile in single grout pile is moved backward, and at perfusion very useful rigidity Guan Liang, coupling beam or intermediate plate, front and back campshed is coupled together composition static-indeterminant supporting structural system;

The degree of depth of foundation ditch both sides castinplace pile, array pitch and pile spacing is formulated according to the degree of depth of sluice, width and geological condition;

Array pitch is between 3D to 5D, and D is castinplace pile diameter, and front-seat pile spacing is not more than 2D, and rear campshed spacing is not more than 3D;

Select the need of carrying out inter-pile soil body, base reinforcing according to soil body physical and mechanical property, groundwater table situation; When constructing in weak soil soil layer, first carry out the reinforcing of inter-pile soil body, adopt cement mixing pile or high-pressure rotary jet grouting pile, then beat castinplace pile in stake inner sleeve; Filling pile construction adopts slewing drilling machine, Churn drill, rotary drilling rig;

B, bottom stab ilization

When constructing in weak soil soil layer, dual pipe high-pressure rotary jet grouting pile is adopted to carry out full hall bottom stab ilization; This step is not needed when constructing in other soil layers;

C, rolling line excavation of foundation pit

The main foundation ditch sectional excavation of rolling line, and sluice supporting Guan Liang, intermediate plate groove are together dug out;

D, stake apical cap beam, coupling beam or intermediate plate are constructed

According to main pit earthwork sequence of excavation, section construction Guan Liang, intermediate plate, after concrete strength reaches 75% intensity, allow the earthwork in excavation sluice;

E, sluice excavation of foundation pit

In sluice, the earthwork is according to Guan Liang, intermediate plate sequence of construction excavation section by section, and during excavation, digging machine stands on Guan Liang, intermediate plate and has bad luck the earthwork;

F, structure construction

Sluice structure is according to rolling line base plate segmentation situation organizing construction; Vertically construct at twice, base plate of constructing for the first time, absolute altitude at the bottom of second time construction side wall to rolling line sole plate.