The other day ，Be known as“The first pit in North China”The foundation pit support and groundwater control project of forging die workshop of Tongyu Heavy Industry Co., Ltd. has entered the end of construction.，The project has completed the construction of all cement-soil mixing walls with the same thickness during the National Day holiday.，The equipment used is Jintai, which combines hydraulic slotting machine equipment technology and deep mixing technology.SC55 double-wheel mixing drill。

Tongyu Heavy IndustriesHigh-end equipment core components energy-saving and material-saving technology and equipment upgrading project，It is a provincial key project in 2022.，It is one of the few super-deep foundation pits in the north.。Total planned investment of the project 7.600 million yuan。The project includes the forging die workshop of Tongyu Heavy Industry.、Die Forging Press、Construction of foundation pit and pile foundation of pump house，The construction period is 160 days.。The foundation pit between the die forging press and the pump house is generally irregular rectangular.，About 91 meters long from east to west.5，About 34 wide from north to southm，The perimeter of foundation pit is about 261.70m,Excavation depth of foundation pit in pump house section is 11.5-13.5m,Excavation depth of foundation pit in press section is 11.5-26.0m.

Stratigraphic profile：Mainly plain fill、Silty clay、Silt、Silty fine sand、Composition of silty clay。

ForEngineering geological conditions of the construction site、Hydrogeological conditions、Excavation depth of foundation pit and surrounding environment，The final decision of the Construction Project Department after comprehensive consideration，Equipment selection JintaiSMCConstruction method drilling rig。

Features of the drilling rig for this method：

1、Size of the formed wall、Depth、Grouting volume、High control precision of parameters such as verticality，Stir well，The quality of the wall is good.;

2、Wall thickness is 0.7m~1.2m；

3、Various foundation pit shapes can be constructed，The corner is convenient；

4、Milling wheel torque up to 8~10t.m，Adapt to various complex strata，It can enter the rock to the moderately weathered layer.，Wide range of formation adaptation；

5、Milling wheel speed up to 0~25rpm；

6、The pile length can reach more than 60 meters.。

ThisWaterproof curtain works of the site，Wall thickness 800mm，Depth-40.50m~53.50mNot equal。Before formal construction,Kim TaeSC55 The double-wheel mixing drilling rig shall be used for trial wall completion as required by the construction party..Kim TaeSC55 Double-wheel mixing equipment live up to expectations，And that construction efficiency is high，The quality of the wall is excellent.，No broken core during coring after wall formation，The hardness is much higher than the design requirement of 0.8MPa，The impermeability is also far beyond the design requirements.，It has received unanimous praise from Tianjin Hecheng Foundation Engineering Co., Ltd. and the general contractor of the project.（Tianjin Hecheng Foundation completed 15 similar projects from 2017 to 2022，Rich experience in deep foundation construction）。The construction machinery is determined accordingly.、Construction process and parameters。

NowConstruction Day 78，A total of 118 cut-off walls have been completed.。Wherein the thickness is 800mm、Depth 40.5m50 pieces of cut-off walls have been completed.，It can be completed in 5 hours on average；800 thickmm、Deep 53.5mA total of 68 pieces were completed，Average 8 hours to complete。Transfer of existing equipment to Tianjin，Get ready for the next project.。

SCSeries double-wheel mixing drilling rig is independently developed and manufactured by Shanghai Jintai for complex geological conditions.，Through“Deep milling and stirring technology”Innovative and technically mature products for diaphragm wall construction。The product was launched in 2010.，It has made a huge response in the market.，Experienced the clay first.、Fine and dense silt、The test of typical complex geological conditions such as pebbles and moderately weathered rocks，Later, it experienced being hunted by its similar competitors in various regions..Final，Kim TaeSMCThe drilling rig of the construction method is superior to the competing products on the same stage with the posture of a giant.，The construction efficiency and equipment stability index have reached the international advanced level.，In terms of product cost performance, it is obviously superior to similar products of foreign brands.。