CN104155345A

CN104155345A - Method for monitoring pouring compactness of self-compacting concrete in large-scale structural module wall

Info

Publication number: CN104155345A
Application number: CN201410443126.6A
Authority: CN
Inventors: 韩飞
Original assignee: STATE NUCLEAR POWER ENGINEERING Co
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2014-09-02
Filing date: 2014-09-02
Publication date: 2014-11-19
Anticipated expiration: 2034-09-02
Also published as: CN104155345B

Abstract

Monitoring on pouring compactness of self-compacting concrete in a large-scale structural module wall of an AP/CAP serial three-generation nuclear power plant is the construction difficult problem which is not completely effectively solved so far and currently, a method for determining compactness of the concrete in a large-scale structural module mainly adopts ultrasonic detection. Experiments prove that an ultrasonic detection result is not ideal very much due to complex structures inside the structural module, such as a shear concrete stud and a section steel, and a heterogenous material forming the concrete. Moreover, ultrasonic detection equipment is large, is difficult to place in a narrow space, is unsuitable to monitor in the construction process and is mostly detected afterwards; if the condition that the concrete is not compact is generated, the rework is difficult. A method disclosed by the invention adopts a mode of detecting a current or a resistance through a closed circuit loop, can monitor the compactness condition and timely rectify in the pouring process and has the advantages of simplicity and sensitivity for operation, accurate result and the like.

Description

In monitoring large scale structure module body of wall, self-compacting concrete is built the method for packing

Technical field

The present invention relates to a kind of method of monitoring the inner self-compacting concrete of nuclear power station large scale structure module body of wall and build packing.

Background technology

AP/CAP series compressed water reactor nuclear power technology is one of state-of-the-art three generations's nuclear power technology in the current world, and modularization building technology is one of great feature of this AP/CAP nuclear power technology, and modularization can be saved the duration to greatest extent.This technology has adopted a series of large-scale steel structure modules, such as CA01, CA02, CA03, CA04, CA20 etc.Such steel construction module body of wall inner structure complexity, and the inner casting concrete of body of wall is self-compacting concrete, can not vibrate with vibrating spear, it is as improper in method control that easily to cause inner concrete to be difficult to closely knit, mainly at following four class positions: the 1) region between angle steel and steel plate, the concrete leakiness that easily causes as unreasonable in concrete flows; 2) angle steel and channel-section steel Nodes; 3) inside configuration vertical steel buttress portion; 4) structure corner, top blind flange bottom etc.; 5) vertical baffle region between every section of body of wall; 6) OLP plate dorsal area; 7) wall hole, penetration piece region etc.

Be mainly Ultrasonic Detection for the method for confirming large scale structure module contents concrete density at present.Evidence, because the structures such as the inner WELDING STUDS of construction module, shaped steel are comparatively complicated, concrete is originally as heterogeneous material in addition, and ultrasonic testing results is very undesirable.And ultrasonic detection equipment is larger, small space equipment is difficult to arrange, is not suitable for monitoring in work progress, mostly is afterwards and detects, as uncompacted situation occurs, and reprocesses difficulty larger.

Summary of the invention

The object of this invention is to provide a kind of method that is suitable for the confirmation large scale structure module contents concrete density of implementing at work progress, and can be applicable to small space.

In order to achieve the above object, technical scheme of the present invention has been to provide a kind of method of monitoring the inner self-compacting concrete of nuclear power station large scale structure module body of wall and build packing, it is characterized in that, step is:

The first step, in the body of wall of nuclear power station large scale structure module, build before self-compacting concrete, judge that body of wall inside may exist the region of leakiness hidden danger;

Second step, in body of wall pre-buried cable, one end of cable is positioned at the region that may have leakiness hidden danger, meanwhile, this end of cable does not contact large scale structure module body, the other end of cable leads to outside body of wall;

The 3rd step, in body of wall, build in self-compacting concrete process, after may there is the region of leakiness hidden danger or being covered by self-compacting concrete, or on the end outside cable is drawn body of wall, connect an external power source and galvanometer form loop, or connect a multimeter and form loop on end outside cable is drawn body of wall;

The 4th step, when in the 3rd step, when series connection one external power source and galvanometer:

Observe galvanometer and whether monitor electric current, if monitor electric current, illustrate that the concrete in the region that may have leakiness hidden danger is closely knit, if do not monitor electric current, illustrate that the concrete in the region that may have leakiness hidden danger is not closely knit;

When in the 3rd step, when series connection one multimeter:

Observe the resistance value recording by multimeter, if resistance is less, illustrate that the concrete in the region that may have leakiness hidden danger is closely knit, if resistance convergence infinity illustrates that the concrete in the region that may have leakiness hidden danger is not closely knit.

Preferably, in described the 4th step, if may exist the concrete in region of leakiness hidden danger not closely knit, region is adopted the mode of the slight disturbance of rod member, until or monitor electric current or the resistance value that records by multimeter obviously reduces by described galvanometer.

Method provided by the invention is compared Ultrasonic Detection following technical characterstic: 1) simple to operate, sensitive; 2) line arrangement is flexible, is not subject to space constraint; 3) result is accurate; 4) can in casting process, monitor, can rectify and improve in time if you have questions; 5) in cable Transducers Embedded in Concrete, can not exert an influence to structural safety.

Brief description of the drawings

Fig. 1 is a kind of schematic diagram of monitoring the inner self-compacting concrete of nuclear power station large scale structure module body of wall and build the scheme one of the method for packing provided by the invention;

Fig. 2 is a kind of schematic diagram of monitoring the inner self-compacting concrete of nuclear power station large scale structure module body of wall and build the scheme two of the method for packing provided by the invention.

Embodiment

For the present invention is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.

Embodiment 1

As shown in Figure 1, the disclosed a kind of inner self-compacting concrete of nuclear power station large scale structure module body of wall of monitoring of the present embodiment is built the step of the method for packing and is:

The first step, in the body of wall 1 of nuclear power station large scale structure module, build before self-compacting concrete, judge that body of wall 1 inside may exist the region 2 of leakiness hidden danger;

Second step, at the interior pre-buried 0.3mm of body of wall 1 ²cable 3, one end of cable 3 is positioned at the region 2 that may have leakiness hidden danger, and meanwhile, this end of cable 3 does not contact large scale structure module body, and the other end of cable 3 leads to outside body of wall 1;

The 3rd step, in body of wall 1, build in self-compacting concrete process, after may there is the region 2 of leakiness hidden danger or being covered by self-compacting concrete, on the end outside cable 3 is drawn body of wall 1, connect an external power source and galvanometer form loop;

Whether the 4th step, observation galvanometer monitor electric current, if monitor electric current, the concrete that the region 2 that may have leakiness hidden danger is described is closely knit, if do not monitor electric current, the concrete that the region 2 that may have leakiness hidden danger is described is not closely knit, region 2 is adopted as the mode of the slight disturbances of rod member such as reinforcing bar, until monitor electric current by described galvanometer, prove that the concrete in this region 2 is closely knit.

Embodiment 2

As shown in Figure 2, the present embodiment is disclosed a kind ofly monitors that the inner self-compacting concrete of nuclear power station large scale structure module body of wall is built the method for packing and the difference of embodiment 1 is:

In described the 3rd step, on the end outside cable 3 is drawn body of wall 1, connect a multimeter and form loop.

Described the 4th step changes into: observe the resistance value recording by multimeter, if resistance is less, the concrete that the region 2 that may have leakiness hidden danger is described is closely knit, if resistance convergence infinity, the concrete that the region 2 that may have leakiness hidden danger is described is not closely knit, region 2 is adopted as the mode of the slight disturbances of rod member such as reinforcing bar, until the resistance value recording by multimeter obviously reduces, prove that the concrete in this region 2 is closely knit.

Claims

1. monitor the inner self-compacting concrete of nuclear power station large scale structure module body of wall and build a method for packing, it is characterized in that, step is:

The first step, in the body of wall (1) of nuclear power station large scale structure module, build before self-compacting concrete, judge that body of wall (1) inside may exist the region (2) of leakiness hidden danger;

Second step, in body of wall (1) pre-buried cable (3), one end of cable (3) is positioned at the region (2) that may have leakiness hidden danger, simultaneously, this end of cable (3) does not contact large scale structure module body, and the other end of cable (3) leads to outside body of wall (1);

The 3rd step, in body of wall (1), build in self-compacting concrete process, after may there is the region (2) of leakiness hidden danger or being covered by self-compacting concrete, or on the end outside cable (3) is drawn body of wall (1), connect an external power source and galvanometer form loop, or connect a multimeter and form loop on end outside cable (3) is drawn body of wall (1);

Observe galvanometer and whether monitor electric current, if monitor electric current, the concrete that the region (2) that may have leakiness hidden danger is described is closely knit, if do not monitor electric current, illustrates that the concrete in the region (2) that may have leakiness hidden danger is not closely knit;

When in the 3rd step, when series connection one multimeter:

Observe the resistance value recording by multimeter, if resistance is less, the concrete that the region (2) that may have leakiness hidden danger is described is closely knit, if resistance convergence infinity illustrates that the concrete in the region (2) that may have leakiness hidden danger is not closely knit.

2. a kind of method of monitoring the inner self-compacting concrete of nuclear power station large scale structure module body of wall and build packing as claimed in claim 1, it is characterized in that, in described the 4th step, if may exist the concrete in region (2) of leakiness hidden danger not closely knit, region (2) are adopted the mode of rod member slight disturbance, until or monitor electric current or the resistance value that records by multimeter obviously reduces by described galvanometer.