JPH0243413A - Method and device for driving pipe - Google Patents

Abstract

PURPOSE: To permit direct driving of a non-steel pipe into the ground and removal of soil across the insides of pipes by driving a pipe complex consisting of the outer and inner pipes, drawing out the inner pipe filled with soil, and discharging the soil. CONSTITUTION: A pipe complex 9 comprises a non-steel outer pipe 10 and a steel inner pipe 11. The striking force of a ram 3 is transmitted to the inner pipe 11 via an intermediate member 5, while the other pipe 10 is driven by a driving edge 19, without substantially receiving the striking force. Soil, collected within the inner pipe 11 during driving of the pipe complex 9 into the ground, is discharged by removing the ram 3 and the intermediate member 5 and drawing out the inner pipe 11. Thereafter, the inner pipe 11 is embedded in the outer pipe 10 until it abuts against a drill sleeve 8, and the intermediate member 5 and the ram 3 are mounted to resume driving. An outer pipe 10 and the inner pipe 11 are centered by the drill sleeve 8 at the same time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method and apparatus for driving tubes.

[Prior Art] [Problem to be Solved by the Invention] The conical striking tip is guided on a bearing pedestal, either directly or via a piling attachment, with a digging sleeve gripping the front end inwardly and outwardly. Driving steel pipes, such as protective pipes, pipes, etc., using a ram that engages in the rear end of the pipe is increasingly being introduced in practice.

However, in the known method, the impact energy of the ram used to drive the ram tube into the ground is extremely high, so it is not possible to directly drive pipes such as synthetic resin pipes and ceramic pipes, which do not have as high strength and toughness as steel pipes, directly into the ground. Rather, in this case first a shaft is excavated, for example using a ram drilling machine, into which the ceramic or plastic pipe is then introduced, or the pipe to be buried can be immediately introduced following the ram drilling machine. However, in order to bury pipes with limited diameter, zero strength, and poor toughness in the shaft excavated by a ram drilling machine, it is necessary to first insert a steel protection pipe into the ground, and then insert a synthetic resin pipe or ceramic pipe into the ground. It is often necessary to draw the tube into a protective tube. Ram pipes have an open front or excavation sleeve, so apart from the difficulty and expense of non-steel control installation, soil gradually invades the inside of the pipe during pile driving.
The digging sleeve, on the other hand, compacts the soil surrounding the tube and, due to its larger diameter than the tube, creates a shaft through which the ram tube advances with relatively low friction under the blows of the ram.

As the ram advances and the inside of the pipe becomes clogged with soil, the friction of the soil against the inner wall of the pipe also increases. This is especially the case when the soil inside the tube becomes increasingly compacted under the influence of the ram blow and the soil entering from the front end of the tube. Furthermore, when the pipe moves forward, the soil inside the pipe is forcibly accelerated. In this way, energy costs increase overall.

Many methods are known for removing soil from inside pipes. Soil can be removed from the inside of the tube using a driven screw, for example. However, this requires additionally high equipment costs, as does washing the soil with high-pressure water. Another method for removing soil from the inside of the pipe is to fit a propulsion disc inside the front end of the pipe after pile driving is completed, place it in close contact with the inner wall of the pipe, and apply compressed air to the inside of the pipe in front of the disc in the pile driving direction. In addition, a propulsion disk that moves inside the pipe under the action of compressed air is used to push soil out of the pipe in the opposite direction to the pile driving direction.

This method is also expensive and can only be carried out when the pipe length is short and the frictional resistance is small, since the soil rubs against the inner wall of the pipe.

[Means for Solving the Problems] Therefore, an object of the present invention is to provide a method and apparatus that enable direct driving of non-steel pipes into the ground and removal of soil accumulated inside the pipes without difficulty. do.

This objective is achieved according to the invention by implanting a tube composite. In this case, it is desirable to align the preferably concentrically fitted tubes with respect to each other in a predetermined position and to apply the digging force to the tube complex, preferably via the inner tube. By leaving the outer of the two tubes in the ground, the tubes can be inserted directly into the ground without requiring additional work steps.

In this case, the tube is driven from the starting groove to the target groove. Since the length of the ram tube is limited, the outer conduit is constructed by fitting several ram tubes together. If the digging force is applied primarily through an inner tube made of steel, the outer tube may in particular be a synthetic resin tube or a ceramic tube, so that it can be inserted into the ground without being damaged by the blows of the ram. Depending on the distance from the starting groove to the target groove, a plurality of pipes or pipe lengths can be connected to form a conduit.

Preferably, the tube is driven in a sidewalk manner, and the soil-filled inner tube is pulled out, drained, and reinserted after each sidewalk. In this way, the outer pipe can be inserted into the ground while excavating the soil.

This is because in this way it is possible to achieve intermediate or partial evacuation when the inner tube, for example, is driven only half into the ground and then pulled out of the outer tube to remove the soil therein. The inner tube can be pulled out, for example, with a grip puller or jack. Since the pipe is excavated step by step while the inner pipe is partially discharged, an upper crosspiece corresponding to the entire length is formed inside the ram pipe, unlike the well-known pile driving method, and therefore the pipe is not accelerated together with the pile driving method. A small digging force can make do with this. After each mid-drain, push the empty inner tube back into the outer tube. After each partial evacuation, there is a simple opportunity to check the orientation of the tube, for example using laser light. After the pipe types reach the target trench, the inner pipe is pulled out from the outer pipe together with the upper crosspiece, leaving the finished outer pipe in the ground.

The tube can be aligned from the front in the driving direction with a drilling sleeve fitted onto the outer tube and the inner tube mainly disposed concentrically therein. In this way, while the two pipes are removable, they can be firmly connected during driving, and the outer pipe is either a synthetic resin pipe or a ceramic pipe, which means that the risk of breakage must always be taken into consideration, which is not possible with normal pile driving methods. It may be a pipe that cannot be driven directly into the ground.

The drilling sleeve can preferably be provided with a stepped collar, the inner diameter of which is not larger than the outer diameter of the inner tube, which allows simultaneous alignment of both tubes, with the front of the stepped collar in the striking direction The part surrounds the inner pipe that protrudes from the outer pipe, while the stepped rear part surrounds the outer pipe. By limiting the internal diameter of the excavation sleeve, no soil can enter the annular gap between the inner and outer tubes.

If the drilling sleeve has an outlet, an anti-friction fluid can be supplied through this opening from the direction of the starting groove in order to reduce the friction between the top and the outer tube.

It is desirable to firmly connect the different inner tubes to each other at the joint. The tube abutments of the individual inner tubes combined to form a complete length can be permanently connected, for example by threading, screwing, or welding.

The intermediate member, which is arranged on the ram and engages in the rear end of the inner tube, can preferably have a driver projecting radially from the inner tube, advantageously configured as a driving edge 6, for example a striking tip or The front part of the intermediate member located at either of the rear ends of the ram fits into the tube, but the drive edge remains outside the tube and coincides with the end face of the outer tube. During operation of the ram, the portion of the intermediate member fitted into the inner tube expands radially and becomes tightly connected to the wall of the inner tube.

As a result, the impact energy is transmitted to the inner pipe, and the edge causes the outer pipe to follow the impact energy without transmitting the impact energy to the outer pipe.

[Example] The present invention will be described in detail below based on the illustrated example. When driving a pile horizontally, the ram 3 guided on the bearing stand 2 in the starting groove 1 has its striking tip 4 engaged in the rear end of the pipe combination 9 to be driven into the ground 6 via the intermediate member 5. The combined tube type is guided by a bearing pedestal 7 and is provided with a drilling sleeve 8 at the front end.

. The tube type combination 9 is, for example, an outer tube 1 made of synthetic resin or ceramic.
0 and an inner tube 11 mainly made of steel.

The inner tube 11 fitted concentrically into the outer tube 10 protrudes from the outer tube 1o in the striking direction or piling direction 12, and the excavation sleeve 8 fitted into the tube type combination 9 aligns both tubes 10 and 11 simultaneously. For this purpose, the digging sleeve has a stepped collar 13, whose stepped front part in the striking direction 12 surrounds the front end projecting in front of the inner tube 11, and whose stepped rear part 1 has a larger diameter than the front part.
4 surrounds the outer tube 10. The inner diameter 15 of the excavation sleeve 8 is not larger than the outer diameter of the inner tube 11, making it impossible for soil to penetrate into the radial gap 16 between the concentrically fitted tubes to, tt. Furthermore, the drilling sleeve 8 is provided with an outlet 17 communicating with one another as a kind of annular channel, from which an anti-friction material supply pipe 18 extends through the intermediate part 5 to the starting groove 1. At the rear end of the combined pipe type 9, that is, at the end opposite the ram 3, the pipes 10 and 11 terminate on the same plane, and the intermediate member 5 fitted thereon applies the impact force of the ram 3 to the inside of the inner pipe 11. The outer tube 10 is provided with a driving edge 1 configured as a radial collar of the intermediate member 5, while the outer tube 10 is provided to the tube type union via the mating part.
9, it can be driven substantially without receiving any force.

Therefore, even pipes such as synthetic resin pipes, ceramic pipes, etc., which would normally be destroyed by impact action, can be buried directly in the ground by digging the inner pipe 11 without being exposed to destructive effects.

When the combined pipe type 9 is driven into the ground 6, the ±6 that collects as a nucleus in the inner pipe 11 is discharged, for example, halfway after the combined pipe type 9 is driven halfway into the underground 6.

For this purpose, the ram 3 and the intermediate member 5 are pulled out from the pipe 10 using, for example, a jack (not shown), and then the inner pipe 11 is
is pulled out and pushed into the outer tube 10 again until it contacts the excavation sleeve 8, and the intermediate member 5 and ram 3 are fitted to the rear end of the tube type combination 9 for re-driving.

[Brief explanation of the drawing]

The accompanying drawings are cross-sectional views showing embodiments of the present invention. 1... Departure groove 3...Rum 8...Drilling sleeve 10...Outer tube 12... Drive direction 17...Exhaust port 19... Drive edge 2.7...Bearing stand 5...Intermediate member 9...Pipe type combination 11...Inner tube 13...Stepped color 18... Anti-friction material supply pipe 3 others

Claims (1)

[Claims] 1. In a method of driving a pipe into the ground, the pipe (10, 11)
A method characterized by injecting a complex of. 2. Method according to claim 1, characterized in that the two tubes (10, 11) are mutually aligned in a predetermined position. 3. Method according to claim 1 or 2, characterized in that a digging force is applied to the tube complex (9) via the inner tube (11). 4. The method according to any one of claims 1 to 3, characterized in that the inner tube (11) filled with soil is pulled out and the soil is removed. 5. The method according to claim 4, further comprising inspecting the direction of excavation of the outer tube after pulling out the inner tube. 6 In the method of driving a pipe into the ground, the pipe (10, 11)
In the apparatus for carrying out the method characterized in that a composite body is driven in, a drilling sleeve (8) fitted into the outer tube (10) and the inner tube (11) from the front in the driving direction (12) is inserted into the tube (10).
, 11). 7 The inner diameter (15) of the drilling sleeve (8) is the inner pipe (11)
7. Device according to claim 6, characterized in that it is not larger than the outer diameter of the device. 8. Device according to claim 6 or 7, characterized in that the drilling sleeve (8) has an outlet (17). 9. Device according to any one of claims 6 to 8, characterized in that the drilling sleeve (8) has a stepped collar (13). 10. Device according to any one of claims 6 to 9, characterized in that the outer tube (10) is made of synthetic resin or ceramic. 11. Device according to any one of claims 6 to 10, characterized in that the inner tubes (11) are rigidly connected to each other at a joint. 12 that the intermediate member (5) engaging in the rear end of the inner tube (11) arranged on the ram (3) has a drive body (19) projecting radially from the inner tube (11); 12. A device according to any one of claims 6 to 11, characterized in that: 13. Device according to claim 12, characterized by a driving edge (19) of the intermediate member (5).