CN109056734A

CN109056734A - Diaphram wall defect grouting mending construction method

Info

Publication number: CN109056734A
Application number: CN201810979678.7A
Authority: CN
Inventors: 吴洁妹; 尹宇杰; 赵永强; 赵国伟; 荀为卓; 董恒晟; 谭纯
Original assignee: Shanghai Foundation Engineering Group Co Ltd
Current assignee: Shanghai Foundation Engineering Group Co Ltd
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2018-12-21

Abstract

The present invention relates to a kind of diaphram wall defect grouting mending construction methods, it the steps include: 1) in defective locations two sides construction water-stop curtain, and clear up waste pulp and roach above slot section, 2) take core-drill(ing) machine pilot hole to designated depth in designated position, 3) the slurry pipe of appropriate size is installed in coring hole, two slurry pipes are buried in each coring hole, one is Grouting Pipe, another is discharge pipe, 4) it is washed with water using grouting pump, it is promoted up and down in cleaning, until overflowing clear water in hole, 5) using the past slurry ipe grout of grouting material, 6) slip casting is more than twice in each coring hole, first, the slip casting in a Grouting Pipe, it emerges in another discharge pipe and stops slip casting after slurries and close ball valve；Slip casting is until slurry overpressure reaches 1Mpa or more again later, and stopping slip casting simultaneously closes ball valve, and slip casting terminates.The present invention a variety of diaphram wall defects and leakage problem caused by can effectively solving because of cause specific.

Description

Diaphram wall defect grouting mending construction method

Technical field

The present invention relates to a kind of grouting mending methods in diaphram wall defective locations.

Background technique

Diaphram wall goes along with sb. to guard him form as current deep-foundation pit engineering is most common, is widely used at home at present, but Since diaphram wall, especially ultra-deep underground continuous wall difficulty of construction are high, it may be interfered and be made by extraneous factor in work progress At mass defect, such as concrete supply not in time, natural weather or other reasons cause construction to interrupt, field geology conditions it is complicated Deng.Since ground wall quality is concerning deep pit monitor, defect must be handled.The traditional benefit wall taken on the outside of wall, The measures cost such as piling is extremely high, and due to that concrete strength need be waited to rise, entire project progress is also seriously tied down. Therefore, it is necessary to invent a kind of diaphram wall defect grouting mending construction method, can effectively repair above-mentioned by research tackling key problem Defect, while repairing cost is substantially reduced, reduce duration loss.

Summary of the invention

The present invention is to solve already present ground wall mass defects, provide one kind and apply in diaphram wall defect grouting mending Work method.

To achieve the above object, the present invention is achieved by the following technical solutions:

1) a kind of diaphram wall defect grouting mending construction method the steps include: in defective locations two sides construction sealing Curtain, and clear up waste pulp and roach above slot section, 2) take core-drill(ing) machine pilot hole to designated depth in designated position, 3) coring The slurry pipe of appropriate size is installed in hole, two slurry pipes are buried in each coring hole, one is Grouting Pipe, and another is discharge pipe, 4) it is washed with water using grouting pump, is promoted up and down in cleaning, until overflowing clear water in hole, 5) use grouting material toward slurry pipe Interior grouting, 6) slip casting more than twice, firstly, the slip casting in a Grouting Pipe, is emerged in another discharge pipe in each coring hole Stop slip casting after slurries and closes the ball valve of Grouting Pipe and discharge pipe；Later again slip casting until Grouting Pipe and blowing overpressure Reach 1Mpa or more, stop slip casting and close ball valve, slip casting terminates.

In step 1), to prevent slurries in filling process excessive, first in ground wall defective locations two sides construction water-stop curtain, adopt It is reinforced with conventional rotary jet strengthening or MJS engineering method, to guarantee repair efficiency.

In step 2), first in ground wall defective locations pilot hole, aperture should meet the installation needs of subsequent slurry pipe, and ultimate depth is answered Depending on actual conditions after coring, until core sample meets the requirements.

The Grouting Pipe is equipped with mouth spray in designated depth, and the aperture stifled jail of geotextiles prevents roach, waste pulp from pouring in hole It is interior.

The grouting material is big flowing and the high feature of early strength with ungauged regions, and chloride and metal be not swollen Swollen dose of grouting material；The grouting material 3d compression strength reaches 25Mpa or more, and 7d compression strength is more than or equal under original place and connects Continuous wall concrete crushing strength.

The beneficial effects of the present invention are:

The present invention a variety of diaphram wall defects caused by can effectively solving because of cause specific, such as by wall covered with mud, mixed Local strength's defect and leakage problem caused by the reasons such as solidifying soil is layered, connector is dealt with improperly；Execute-in-place of the present invention is easy, Relevant device, material are readily transported and store, and can carry out rapidly operation under complicated, narrow site condition, have high Adaptability；Practice result proves working well using invention repairing diaphram wall, the intensity and sealing after repairing Design and site requirement can be fully met.

Detailed description of the invention

Fig. 1 is ground wall defect schematic diagram；

Fig. 2 is water-stop curtain schematic diagram；

Wherein: (a) being top view, (b) longitudinal sectional view；

Fig. 3 is grouting process schematic diagram；

Fig. 4 is pigging and grouting schematic diagram；

Wherein: (a) pigging (b) is in the milk.

Specific embodiment

The invention will be further described with embodiment with reference to the accompanying drawing.

Diaphram wall defect grouting mending construction method of the invention, construction procedure is:

1) in the two sides Di Qiang construction water-stop curtain, the waste pulp and roach above slot section are cleared up

To prevent slurries in filling process excessive, first in the ground two sides (see Fig. 1) wall defective locations A construction water-stop curtain, such as Fig. 2 (a), it is (b) shown, C can be reinforced using conventional rotary jet strengthening B or MJS engineering method, to guarantee repair efficiency.In order to protect Card ground wall repairing work can be accurately positioned defective locations, should also first clean out the waste pulp generated in the above process, roach.

2) take core-drill(ing) machine pilot hole to designated depth in designated position

Drawing hole site is tentatively drafted according to the construction note of defectively wall D, is generally arranged along the direction Di Qiang.Investment In designated position pilot hole, aperture should meet the peace of subsequent slurry pipe for core-drill(ing) machine or other equipment crept into concrete of having the ability Dress needs, and ultimate depth should be depending on actual conditions after coring, until core sample meets the requirements.

3) installation slurry pipe in coring hole

The slurry pipe of appropriate size is installed in coring hole, slurry pipe should be able to bear the pressure during slip casting, preferably use steel pipe； Two slurry pipes are buried in each coring hole, as shown in figure 3, one is Grouting Pipe 1, another is discharge pipe 2；Grouting Pipe 1 is referring to Depthkeeping degree is equipped with plural mouth spray, and the aperture stifled jail of geotextiles prevents roach, waste pulp from pouring in hole.

4) cleaning slurry pipe

Grouting Pipe 1 and discharge pipe 2 clean (see Fig. 4 (a)) using grouting pump water 5 after the installation is completed, in cleaning above and below It is promoted, until overflowing clear water 6 in hole 4.

5) grouting mending

As shown in Fig. 4 (b), be in the milk 7 in Grouting Pipe 1 using special grouting material, which has a ungauged regions, big flowing and The high feature of early strength, and not chloride and expansion of metal agent；Grouting material 3d compression strength can achieve 25Mpa with On, 7d compression strength should be greater than being equal to continuous wall concrete compression strength under original place.In each coring hole must slip casting more than twice, The slip casting in a wherein Grouting Pipe 1 first, another is used as discharge pipe 2, stops slip casting after slurries of emerging in discharge pipe 2 and closes Close ball valve 3；Until pressure reaches 1Mpa or more in Grouting Pipe 1 and discharge pipe 2, stopping slip casting simultaneously secures slip casting for slip casting again later The ball valve 3 of pipe 1 and discharge pipe 2, slip casting terminates；It is closely knit to guarantee that grouting material can fill ground wall defective locations A by the above method.

Claims

1. a kind of diaphram wall defect grouting mending construction method, which is characterized in that the steps include: 1) in defective locations two sides Construct water-stop curtain, and clear up waste pulp and roach above slot section, 2) take core-drill(ing) machine pilot hole to specified depth in designated position Degree, 3) the slurry pipe of installation appropriate size in coring hole is buried two slurries in each coring hole and is managed, and one is Grouting Pipe, Ling Yigen For discharge pipe, 4) it is washed with water using grouting pump, it is promoted up and down in cleaning, until until overflowing clear water, 5) use filling. in the hole in Slurry is toward slurry ipe grout, 6) more than twice, firstly, the slip casting in a Grouting Pipe, another is put for slip casting in each coring hole Starch the ball valve for stopping slip casting after emerging slurries in pipe and closing Grouting Pipe and discharge pipe；Slip casting up to Grouting Pipe and is put again later Slurry overpressure reaches 1Mpa or more, stops slip casting and closes ball valve, slip casting terminates.

2. diaphram wall defect grouting mending construction method according to claim 1, it is characterised in that: in step 1), To prevent slurries in filling process excessive, first in ground wall defective locations two sides construction water-stop curtain, using conventional rotary jet strengthening Or MJS engineering method is reinforced, to guarantee repair efficiency.

3. diaphram wall defect grouting mending construction method according to claim 1, it is characterised in that: in step 2), First in ground wall defective locations pilot hole, aperture should meet the installation needs of subsequent slurry pipe, and ultimate depth should be according to feelings practical after coring Depending on condition, until core sample meets the requirements.

4. diaphram wall defect grouting mending construction method according to claim 1, it is characterised in that: the Grouting Pipe It is equipped with mouth spray in designated depth, the aperture stifled jail of geotextiles prevents roach, waste pulp from pouring in hole.

5. diaphram wall defect grouting mending construction method according to claim 1, it is characterised in that: the grouting material For with ungauged regions, greatly flowing and the high feature of early strength, and the not grouting material of chloride and expansion of metal agent；It is described Grouting material 3d compression strength reaches 25Mpa or more, and 7d compression strength is more than or equal to continuous wall concrete compression strength under original place.