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AGF-P ( Steel tube forepoling method )

Product

Name : Steel tube forepoling method

Description

:

Steel tube forepoling method can be used in the entrance to Tunnel. Or if the geology

inside the Tunnel is under various fragile conditions ranging from clayey soil to cracked

rock also can be used.

After the traditional supporting method had been used, if excavation still collapse, then

should use the system which can improve and fasten weak ground to prevent collapse.

The AGF method use the drill jumbo of Tunnel to install the long steel tubes into the face

of the Tunnel like the drawing as below. And inject the materials which depend on the

situation of the geology. Through AGF method can make the top of Tunnel's ground

consolidation like a shape of umbrella. To prevent the collapse after excavation.

The advantage of AGF

1.The jumbo of the tunnel can be used, no need to use

appropriative forepoling machine.

2.The normal labor of tunnel can handle the tool of AGF,

no need to use professional labor.

3.We can install different length of steel tube depend on

different geology, and we also have different drill bit

system to use.

If we use the HDPVC tube to instead of the last steel tube, the advantage are as

following:

1.No need to make over excavation.

2.Save the amount of excavation, save the amount of

shotcrete, save the girder, save time, ETC. It means more economical.

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Features : Process of steel tube forepoling method

1.Install the steel tube

Firstly,to mark all the points for installation on the cutting face, then put the steel tube and

drilling rod on the drilling arm of jumbo. Adjustting the drilling arm to the point of

installation, use the pilot bit which adapt with drilling rod and steel tube, through the drilling

arm to drill and push all the steel tubes and drilling rod and bit into the ground of the cutting

face. When they go into the depth of what we need, we can withdraw the bit and all the

rods but only leave all the steel tubes inside the ground.

2.Seal the hole and injection

After finishing all the installation of steel tubes, we should seal all the holes of installation.

And make the injection into every steel tubes.

Specification

:

According to the different machinery, steel tube of forepoling method can be used by

appropriative forepoling machine, which called TREVI Method. Also can be used by jumbo

of tunnel, whcih called AGF Method. Because the AGF Method can use the jumbo which

always stay inside the tunnel, this advantage makes AGF Method more flexible than

TREVI Method. These years, most of the contractors like tochoose AGF Method.The

special tools of AGF that you can find out are at our products of steel tube of forepoling .

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According to the different construction methods, AGF Method can be used for over

excavation and non-over excavation.

If we want to install the steel tube on the face inside the tunnel, we should leave more

space above the cutting face. It means that we have to do more excavation above the

face. We call this over excavation. But it will increase the cost of tunneling. So we develop

non-over excavation, called AGF-P Method. The following drawing are the different

between AGF and AGF-P.

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