US2123243A - Apparatus for manufacturing drain pipes in the earth - Google Patents

Description

July 12, 1938. JANERT 2,123,243

APPARATUS FOR MANUFACTURING DRAIN PIPES IN THE EARTH Filed July 24, 1936 Fig. 1 v I Irma- F H E I N z a A NE rr 7- jm enzor:

1 k his 1471' Patented July 12, 1938 PATENT OFFICE APPARATUS FOR MANUFACTURING DRAIN PIPES IN THE EARTH Heinz Janert, Leiplll, Germany Application July 24, 1936, Serial No. 92,316 In Germany March 29, 1935 11 Claims. (Cl. 111-5) The invention concerns the manufacture of drain pipes inside the earth.

It is known to form pipes of concrete below the earth for draining and water introducing purposes. Until now it was usual to introduce by adapted devices wet concrete into the soil and to form it successively to the pipe. Difllculties arose therein from obstructions oi the channels by the wet and sticky concrete masses.

l0 The invention gives a very advantageous possibility of avoiding said dimculties by introducing the concrete into the soil in dry state and wetting it thereafter by aid of an underground-going body (so called mole body) fitted with transportmg and mixing devices for the dry concrete so as to uniformly admix the water added below the ground and to exert a suflicient pressing of the material against a moulding piece which follows.

In a further embodiment of the invention, a

roof is arranged on top above the mixer and presser similar to the mole body, so as to extend about to the after end of the moulding piece. Thereby any bursting out of the material during pressing is preventedmnd a uniform tube of good rigidity is produced.

A further detail of the invention consists in mounting the moulding piece on the shaft supporting the mixer. The moulding piece is thereby held in definite direction and receives a rotation which is essential for avoiding obstructions during the moulding process.

The shaft supporting the mixing and pressing device is advantageously extended on its rear portion to form the moulding piece. whereby the construction becomes specially simple. If further the said shaft is made hollow for introducing the liquid components, the liquid comes centrally into the mixer and is very uniformly distributed over the whole pipe periphery in consequence of the shaft rotation.

A further detail of the invention consists in arranging the nozzle feeding the liquid from the shaft in a direction contrary to the rotation. This obviates any obstruction of the nozzle or nozzles. I

with special advantage the drive of thepressing device is coupled to the advancing drive in such way that to a certain advancement corresponds a certain rotation velocity of the pressing device. Thereby a constant and regulable pressing pressure is warranted.

For ensuring a specially favorable and completely uniform material introduction to the mixing chamber. the feeding is effected from a supply through a feed pipe containing vertically movable rods or the like.

The mole body including the shaft with pressing device and moulding piece is easily exchangeably arranged on a holding plate for enabling said members to be easily replaceable by members of other dimensions. This gives the possibility to produce pipes of diiferent dimensions by the apparatus remaining unaltered to its largest extent.

The invention is illustrated by way of example in the drawing, in which Fig. 1 shows one embodiment in longitudinal section, I

Fig. 2 is a section along line lIII of Fig. 1,

Fig. 3 is a section along line IIIIII of Fig. 1

Fig. 4 shows a second embodiment in longitudinal section,

Fig. 5 is a. rear view. and

Fig. 6 is a cross section along line VI--VI of Fig. 4.

The apparatus according to Figs. 1 to 3 consists of a holder or blade element I connected to a tractor or other vehicle and carrying a so called mole body 2 which by being drawn through the H soil forms a tube like channel or here in the soil. A trailing core 3 serves for shaping the tube to be formed of the concrete introduced by aid of the blade element I.

For introducing the concrete in dry state, immediately behind the blade element a channel 4 is arranged. The mole body 2 is provided with a shaft 5 rotatable from'top for example by a chain drive 8 and fitted with a press screw I for catching the material coming from the channel 4 and pressing it rearward. 0n the same spot the material is at once wetted by water introduced by a channel 8. In the space 9 adjoining the press screw I and serving as a mixing chamber the shaft 5 is provided with small shovels or the like for thoraughly mixing the wet concrete, which thereaftgi' is shaped to a tube by the core 3. Said core 3 is attached to the shaft 5 by a ball joint, so that it does not need to rotate.

The apparatus according to Figs. 4 to 6 again consists of a blade element I mounted adjustably in height on a (not shown) running frame and holding on its bottom end the mole body 2 and the special mixing and pressing devices arranged in the mixing chamber.

An upper cover separating the mixing chamof the concrete a surely closed chamber is formed. The length of said roof I is so dimensioned that it extends about to the end of the mold body.

The pressing device I I and the mixers I! are rigidly fastened to the shaft l3 whose rear part I has an outer diameter corresponding to the inner diameter of the tube to be manufactured, so as to itself act as a moulding core. The pressing device II has proven especially advantageous when shaped of segments of a helix.

The driving gear of the shaft 13 consists in the illustrated example of a chain gear 6 connected in such way that the material introduction and pressure generation are correctly dependent upon the forward movement of the entire apparatus.

A longitudinal bore ii of the shaft l3 receives liquid from a feeding tube It inclosed in the blade element I and leads it to the mixing chamber through orifices I'I opening backwards with respect to the sense of rotation. The solid material, coming from a supply (not shown), is :led through a feed pipe 4 to the press. Special means, such as longitudinal rods l8 oscillated in longitudinal direction by an eccentric drive IS, from the running drive of the entire apparatus, may be arranged in the feed pipe 4 for freeing it from sticking materials.

The mole body 2 including the shaft and pressing and mixing devices is mounted on the blade element i so as to be easily replaceable, so that the apparatus, remaining unaltered in its other members, is able to produce tubes of different inner and outer diameters corresponding to the chosen dimensions of the mole body 2 and shaft or core H.

I claim:

1. In an apparatus of the character described, a soil separating mole body, a structure for holding said mole body and adapted to be driven through the soil so as to form a subterranean bore, a core connected to the rear end of said mole body and trailing the latter so as to define an annular space with said bore, separate means to introduce solid and liquid ingredients for concrete adjacent the forward end of said core, means to mix the concrete ingredients, and means to press the mixed concrete rearwardly into said annular space, both said mixing and pressing means being carried by the rear end of said mole body before the forward end of said core.

2. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein a central shaft is rotatably held in the mole body and fitted with mixing and pressing devices.

3. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein the a mixing and pressing devices are covered on top by a roof substantially following the upper contour of the mole body.

4. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein a cen-' tral shaft is rotatably held in the mole body, and

the core is fastened to said shaft.

5. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein a central shaft is rotatably held in the mole body and is shaped in its rear portion as a core.

6. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein a hollow central shaft is rotatably held in the mole body and fitted with mixing and pressing devices, and liquid introducing means are connected to said hollow shaft.

7. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein a hollow central shaft is rotatably held in the mole body and fitted with mixing and pressing devices, liquid introducing means are connected to said hollow shaft, and an outlet orifice opens from said shaft into the mixing chamber backwards with respect to the rotation of said hollow shaft.

8. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein a drive for the pressing device is operatively connected to a member rotating in unison with the moving of the mole body along through the soil in such dependency, that the rotational velocity of the pressing device has a distinct ratio to the forward velocity of the entire apparatus.

9. An apparatus for manufacturing drain pipes in the soil as claimed in claim 1, wherein the solid material introducing means consist of a feed pipe provided with longitudinally movable longitudinal rods, and a drive connected to the means for moving the mole body, for oscillating said rods.

10. In an apparatus of the character described, a soil-separating mole body adapted to be driven through the soil so as to form a subterranean bore, a chamber carried by said mole body and extending rearwardly therefrom, means for sepbore.

HEINZ J ANE'RT.

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