CN102926393A

CN102926393A - Vacuum water pumping device for treating liquefaction of building foundation and construction method

Info

Publication number: CN102926393A
Application number: CN201210476152XA
Authority: CN
Inventors: 吴海清; 刘汉龙; 陈育民; 丁选明; 陶惠; 徐呈祥
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2012-11-22
Filing date: 2012-11-22
Publication date: 2013-02-13

Abstract

The invention discloses a vacuum water pumping device for treating liquefaction of a building foundation and a construction method. The vacuum water pumping device consists of vertical pipes with drain holes, horizontal pipes without drain holes, connectors, an earthquake triggering device, a vacuum pump, geotechnical cloth and a lead. A drilling construction way is used in the construction method, and the construction method comprises the following steps of: striking the vertical pipes with the drain holes into the surrounding of a building, wherein the pipes can penetrate through liquefiable earth layers; communicating the vertical pipes with the drain holes and the horizontal pipes without the drain holes through the connectors to form a drain system; connecting the vacuum pump and the horizontal pipes without the drain holes; embedding the earthquake triggering device in the building area; and connecting the earthquake triggering device and the vacuum pump through the lead. When an earthquake comes, the earthquake triggering device senses earthquake motion and triggers the vacuum pump to be started to pump excess pore water pressure produced by the liquefaction of the building foundation. The method is wide in application range, applicable to newly built and existing buildings and general liquefied foundations, simple in construction, easy to operate and low in cost.

Description

A kind of vacuum pumping device and job practices of processing building lot liquefaction

Technical field

The invention belongs to building hydraulic engineering technical field, particularly a kind of vacuum pumping device and job practices of processing building lot liquefaction.

Background technology

In recent years, China's earthquake was continuous, and especially 5.12 Wenchuan violent earthquakes have caused great casualties and property loss, and this reminds us the earthquake liquefaction problem can not be ignored.Because earthquake is frequent, China revises " seismic design provision in building code " GB 50011-2001, summed up Wenchuan earthquake earthquake experience in 2008, the disaster area fortification intensity is adjusted, the shockproof requirements of some key areas also all correspondingly increases.This has just produced a kind of problem, how to improve the antidetonation of built building grade, reduce the possibility of its foundation liquefaction.

The disaster that is caused by liquefaction in the at present earthquake has caused the common concern of engineering circles.In recent ten years, developed the processing method of multiple Liquefaction Foundation, before the present invention, existing pile foundation has crushed stone pile, anti-liquefaction rigid drainage pile, geo-grid sheet, slip casting etc.Wherein commonly used is to process easy liquefied foundation with pile foundation, but the pile foundation that is arranged in easy liquefaction soil layers very easily is seriously damaged, and construction is complicated, and cost is high.

The pile foundation of commonly using in the engineering now is the processing for the liquefied foundation before the architecture construction, and is not suitable for built building.

Summary of the invention

Purpose of the present invention is exactly the defective that is to overcome above-mentioned conventional method, invents a kind of vacuum pumping device and job practices of processing building lot liquefaction, the building that is specially adapted to build.

The technical solution used in the present invention is:

A kind of vacuum pumping device of processing building lot liquefaction, comprise vertical pipe, horizontal pipe, joint, earthquake flip flop equipment, vacuum pump, geotextiles, it is characterized in that: the form of construction work that adopts boring, around building, squeeze into vertical pipe, the vertical pipe depth of burying is according to position and the Depth determination of liquefiable soil layer, vertical pipe sets drain hole at the corresponding length of ground sandy soils place, and in the outside of vertical pipe parcel geotextiles, prevents that drain hole from stopping up; Lay horizontal pipe above vertical pipe, with vertical pipe and horizontal pipe UNICOM, vacuum pump is connected with horizontal pipe by joint; Bury the earthquake flip flop equipment underground in the building place, the earthquake flip flop equipment is connected by wire with vacuum pump; When earthquake was arrived, the earthquake flip flop equipment inductively shook, and triggered vacuum pump and started, and the excess pore water pressure that foundation liquefaction produces is extracted out.

Described pipeline is plastic drainage pipeline, and diameter range 750mm ~ 120mm, the radical of gutter are determined by vertical spacing that according to the size in building place vertical spacing is 1.5m ~ 3m.

A kind of job practices of processing the vacuum pumping device of building lot liquefaction, its major technique step is as follows:

1. according to the geological prospecting result, understand position and the degree of depth of ground liquefiable soil layer, determine the vertical pipe depth of burying;

2. the vertical pipe surface uniform is stamped drain hole;

3. accomplishing fluently the vertical pipe surface parcel geotextiles of drain hole;

4. adopt the job practices of boring to squeeze into ground with the vertical pipe of geotextiles parcel, the degree of depth is passed easy liquefied sand layer;

5. laying horizontal pipe;

6. use tee junction, two pass joints with vertical pipe and horizontal pipe UNICOM, form drainage system;

7. the pipeline with drainage system is communicated with vacuum pump, and makes vacuum pump keep "on" position;

8. embedding earthquake flip flop equipment on the building place;

9. by wire, vacuum pump is connected with the earthquake flip flop equipment.

Advantage of the present invention and effect are:

(1) with respect to pile foundation commonly used in the common engineering, the scope of application of the present invention is wider, and the liquefied foundation before not only being adapted to construct is processed, and built structure foundation is processed same applicable.

(2) with respect to pile foundation commonly used in the common engineering, this device adopts plastic conduit, and with low cost, construction technology is simple, is easy to operate in putting into practice engineering.

(3) in ground, bury the earthquake flip flop equipment underground, can start vacuum pump and draw water in time at the earthquake early period of origination, played the effect of good earthquake prevention.

Description of drawings

Fig. 1 the present invention processes the vacuum pumping device schematic diagram of building lot liquefaction

Fig. 2 the present invention processes the vacuum pumping device plan view of building lot liquefaction

Fig. 3 tee junction schematic diagram

Fig. 4 two pass joint schematic diagrames

Fig. 5 vertical pipe drain hole arrangement diagram

Among the figure:

1 building

2 horizontal pipes

3 vertical pipes

4 tee junctions

5 two pass joints

6 earthquake flip flop equipments

7 vacuum pumps

8 wires

9 drain holes

10 geotextiles

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.Protection scope of the present invention is not limited with the specific embodiment, but is limited by claim.

The specific embodiment:

The present invention is a kind of vacuum pumping device of processing building lot liquefaction, can in time the excessive moisture that produces owing to earthquake liquefaction in the ground be discharged outside the building lot, adopt the form of construction work of boring, vertically squeeze into the vertical pipe (3) with drain hole around building (1), vertical pipe (3) passes easy liquefaction soil layers; By tee junction (4), two pass joints (5) vertical pipe (3) is communicated with the horizontal pipe (2) with drain hole not, forms drainage system; Vacuum pump (7) is connected with the horizontal pipe (2) with drain hole not, bury earthquake flip flop equipment (6) underground in building (1) below, and link together by wire (8) with vacuum pump (7), when earthquake was arrived, earthquake flip flop equipment (6) touched vacuum pump (7) startup and draws water rapidly.

The Specific construction step:

1. according to the geological prospecting result, understand position and the degree of depth of ground liquefiable soil layer, determine vertical pipe (3) depth of burying;

2. vertical tube (3) road surface uniform is stamped drain hole (9);

3. in the vertical pipe of accomplishing fluently drain hole (9) (3) surface parcel geotextiles (10);

4. adopt the job practices of boring to squeeze into ground with the vertical pipe (3) of geotextiles (10) parcel, the degree of depth is passed easy liquefied sand layer;

5. lay not the horizontal pipe (2) with drain hole;

With tee junction (4), two pass joints (5) with vertical pipe (3) with not with horizontal pipe (2) UNICOM of drain hole, form drainage system;

7. the pipeline with drainage system is communicated with vacuum pump (7), and makes vacuum pump (7) keep "on" position;

8. embedding earthquake flip flop equipment (6) on the building place;

9. by wire (8), vacuum pump (7) is connected 6 with the earthquake flip flop equipment) connect.

Claims

1. process the vacuum pumping device that building lot liquefies for one kind, comprise vertical pipe, horizontal pipe, joint, earthquake flip flop equipment, vacuum pump, geotextiles, it is characterized in that: the form of construction work that adopts boring, around building, squeeze into vertical pipe, the vertical pipe depth of burying is according to position and the Depth determination of liquefiable soil layer, vertical pipe sets drain hole at the corresponding length of ground sandy soils place, and in the outside of vertical pipe parcel geotextiles; Lay horizontal pipe above vertical pipe, with vertical pipe and horizontal pipe UNICOM, vacuum pump is connected with horizontal pipe by joint; Bury the earthquake flip flop equipment underground in the building place, the earthquake flip flop equipment is connected by wire with vacuum pump.

2. a kind of vacuum pumping device of processing building lot liquefaction according to claim 1, it is characterized in that: the radical of described vertical pipe is determined by vertical spacing that according to the size in building place vertically spacing is 1.5m ~ 3m.

3. a kind of vacuum pumping device of processing building lot liquefaction according to claim 1, it is characterized in that: described vertical pipe, horizontal pipe are plastic drainage pipeline, diameter is 750mm ~ 120mm.

4. a kind of job practices of processing the vacuum pumping device of building lot liquefaction according to claim 1 comprises following technical step:

1) according to the geological prospecting result, understand position and the degree of depth of ground liquefiable soil layer, determine the vertical pipe depth of burying;

2) the vertical pipe surface uniform is stamped drain hole;

3) accomplishing fluently the vertical pipe surface parcel geotextiles of drain hole;

4) adopt the job practices of boring to squeeze into ground with the vertical pipe of geotextiles parcel, the degree of depth is passed easy liquefied sand layer;

5) lay horizontal pipe;

6) use tee junction, two pass joints with vertical pipe and horizontal pipe UNICOM, form drainage system;

7) pipeline with drainage system is communicated with vacuum pump, and makes vacuum pump keep "on" position;

8) embedding earthquake flip flop equipment on the building place;

9) by wire, vacuum pump is connected with the earthquake flip flop equipment.