JP6399699B2 - Multi-stage extending and pushing device - Google Patents

Description

  The present invention relates to an intermediate pressing device that disperses a propulsion force for embedding an excavator and a propelling pipe row in an intermediate portion of the propelling pipe row without concentrating it on the rearmost end of the propelling pipe row in the propulsion method. The present invention relates to an intermediate pressing device that can smoothly pass through the propulsion construction and the curved section.

The propulsion method is a method in which a face is excavated by a tip excavator and advanced while a plurality of propulsion pipes are added to embed a pipeline in the ground. Propulsive force for advancing the excavator and the propulsion pipe is generated by a plurality of main push jacks installed in the start shaft, and the pressure of the main push jack is applied to the rear end face of the propulsion pipe. The main propulsion resistance is the frictional resistance between the outer periphery of the propulsion pipe and the surrounding ground, and increases in proportion to the propulsion distance.
For this reason, as the propulsion extension becomes longer, the propulsive force necessary to advance the excavator and the propulsion pipe gradually increases, and a force exceeding the axial load resistance of the propulsion pipe is applied, and the propulsion pipe end face at the rearmost part Etc. will be damaged. For this reason, an intermediate pushing device that disperses the propulsive force by providing a plurality of intermediate pushing jacks in advance in the intermediate joint portion of the propelling pipe row is used.

  As the structure of the intermediate pushing device, the tip end step of the first propelling pipe S having a stepped part with a small diameter at the tip part and a long ring extending rearward in a cylindrical collar fixed to the end surface of the front propelling pipe. Insert the part. On the inner periphery of the ring body, a plurality of middle push jacks are evenly arranged in the circumferential direction and fixed to the inner wall of the ring body by metal fittings. Further, a second propulsion tube T having a long step portion with a small diameter at the tip and having a collar into which the small step portion of the next propulsion tube can be inserted in the rear is inserted into the ring body to form a ring-shaped contact. It is the structure which contact | abuts to the rear end of an intermediate | middle push jack via a ring | wheel. The extension length of the intermediate push jack has a longer stroke length as much as possible, and the pushing distance becomes longer and the propulsion efficiency is better. However, when the jack stroke is made longer, the ring length of the first pusher pipe S is increased. However, the length including the height of the jack, the stroke, and the overlap with the second propulsion pipe T is necessary, and it becomes very long, and the length of the entire intermediate pressing device also becomes long. is there.

  With the above technology, the propulsive force for propelling and burying the excavator and the propulsion pipe can be distributed by the intermediate pusher provided in the middle of the propulsion pipe row, and the propulsion pipe at the intermediate pusher installation position and the propulsion pipe in the starting shaft The propulsive force applied to the end of the row can be kept within the allowable load capacity in the axial direction of the propulsion pipe, enabling long-distance propulsion work. In recent years, in addition to long-distance propulsion construction, a number of propulsion plans including curved sections have been adopted. In general, in curve propulsion, in order to pass through a curved section, a method is adopted in which the total length of the intermediate pushing device is made as small as possible by using a jack in which the stroke length of the intermediate pushing jack is shortened. However, since the joint part of the propelling pipe row is a flexible joint through a cushion material in curve propulsion work, in the case of long-distance construction, propulsion generated by an intermediate pushing device using an intermediate push jack with a short stroke length. There was a problem that the force was absorbed by the joint and was not easily transmitted to the excavator located at the head of the propulsion pipe line.

  As an improvement measure, there has been proposed an intermediate pushing device that can pass through a curved section reliably even in a sharp curve, and can perform an intermediate pushing propulsion work with a long stroke of the intermediate pushing jack. The structure has a stepped portion having a small diameter at the front tip, and the stepped portion of the outer cylinder formed by extending a long cylindrical front ring at the rear is inserted into the collar of the forward propelling tube, and the outer cylinder A cylindrical connecting cylinder having a diameter smaller than the inner diameter of the front annular body is inserted so as to abut on the front wall surface of the front annular body via a cushion material, and the front and rear are substantially the same diameter as the outer diameter of the connecting cylinder. A front wall surface of the storage cylinder of a plug-in cylinder having a cylindrical storage cylinder slightly shorter than the length of the propulsion pipe and fixing a cylindrical receiving cylinder having the same diameter as the collar of the propulsion pipe on the rear side. A special intermediate pressing device that is inserted into the front ring body and inscribed so as to contact the rear wall surface of the connecting cylinder through the cushion material, and a plurality of intermediate pressing jacks are arranged in the storage cylinder. It is.

  By the above-mentioned special intermediate pushing device, it is possible to bend at two places on the front and rear by the cushion material mounted on the front and rear of the connecting cylinder, and to form a folding angle with the length of the insertion cylinder containing the intermediate pushing jack. As with the propulsion pipe, it can pass through the sharply curved section without fail, and the intermediate push jack can be installed over the entire length of the storage cylinder, so the stroke length of the jack can be relatively long and efficient. Medium push propulsion construction can be performed. However, it is necessary to remove the connecting cylinder after completion of the propulsion work or to permanently leave it in the pipe, and the jack stroke is only slightly shorter than the length of the front ring covering the storage cylinder. Therefore, when used as an intermediate pusher for ultra-long distance propulsion with a propulsion extension exceeding 1 km, the propulsive force generated by the special intermediate pusher is absorbed by the joint portion of the propulsion tube row and is placed at the head of the propulsion tube row. There is a problem that it is difficult to be transmitted to the located excavator, and when the jack stroke is lengthened, the total length of the special intermediate pushing device becomes long and the curved section cannot be passed.

JP 2014-169537 A

  For this reason, the problem to be solved by the present invention is to provide an intermediate pushing device in a propulsion method that can pass through a curved section with certainty and has a long stroke of an intermediate push jack, which is efficient and can be used even in super-long distance construction. To do.

  The present invention relates to an intermediate pressing device for dispersing propulsive force that concentrates on the rear end face of a propulsion pipe in the propulsion method, and has a stepped portion with a small diameter at the front tip, and a long cylindrical front ring at the rear. The step portion of the outer cylinder formed by extending the body is inserted into the collar of the front propelling tube, and has a diameter smaller than the inner diameter of the front annular body of the outer cylinder and is substantially the same length as the front annular body. The cylindrical intermediate cylinder is inserted so that the front edge of the intermediate cylinder is in contact with the front wall surface of the front ring, and has a diameter smaller than the inner diameter of the intermediate cylinder and is substantially the same length as the front ring. A front tube having a rear tube and having a tubular receiving tube having the same diameter as the collar of the propelling tube and a rear tube tube fixed to the rear tube passes through the intermediate tube, and the front ring Inserted in contact with the front wall surface of the body, and installed on the inside of the stepped portion having a small diameter at the front end of the outer tube and inside the receiving tube of the plug-in tube A push device being configured to Chu押 jack connected by bolts or the like fitting a plurality of installation to.

The outer cylinder is generally made of steel, and the length of the rear front ring is set to cover most of the rear cylinder and the intermediate cylinder inserted into the front ring. A water-stopping material made of rubber or the like is attached to the outer periphery of the stepped portion at the front tip portion, and is kept in close contact with the inner peripheral surface of the collar of the propelling pipe.
The intermediate cylinder is generally made of steel, and its length is set to be substantially the same as the length of the front ring. A water-stopping material made of rubber or the like is mounted on the outer periphery of the front portion of the intermediate cylinder, and is kept in close contact with the peripheral surface of the front annular body to maintain water-stopping. Further, a water-stopping material made of rubber or the like is also attached to the inner periphery of the rear part of the intermediate tube, and the water-stopping property is maintained by being in close contact with the outer peripheral surface of the insertion tube.
A steel material is generally used for the plug-in tube, and a water-stop material made of rubber or the like mounted on the inner periphery of the rear portion of the intermediate tube is in close contact with the outer peripheral surface to maintain water-stop performance. The length of the rear cylinder is set to be substantially the same as the length of the front ring.

  The total length of the intermediate pressing device is determined based on the length of the intermediate pressing jack body installed inside, the stroke of the intermediate pressing jack, and the like. During normal propulsion that does not use an intermediate jack, the length should be approximately the same as the length of the front and rear propulsion pipes. The length of the rear ring of the outer cylinder, the intermediate cylinder, and the insertion cylinder is such that the front ring and the intermediate cylinder, and the intermediate cylinder and the rear cylinder have a predetermined length even when the intermediate push jack is extended to the maximum. It is set so that the connections that are overlapped and inserted are not removed, and is set to approximately the same length.

  Since the intermediate pushing device of the present invention has the entire length during normal propulsion substantially the same as the length of the front and rear propulsion pipes, it can pass through the curved section reliably, and when using the intermediate push jack, by inserting an intermediate cylinder, Even if the jack stroke is lengthened, the inserted connection does not come off, so even in the super long distance propulsion construction, the intermediate pushing propulsion force is transmitted to the excavator located at the head of the propelling pipe row, and the propulsable distance can be extended.

FIG. 1 is a longitudinal sectional view illustrating an intermediate pressing device of the present invention. FIG. 2 is a cross-sectional view illustrating the intermediate pressing device of the present invention. FIG. 3 is a longitudinal sectional view for explaining the operating state of the intermediate pressing device of the present invention.

  In super-long-distance curve propulsion construction, when the intermediate pushing device with the length approximately the same as the length of the front and rear propulsion pipes passes through the curved section reliably, and when the original pushing propulsion force reaches the limit, the long stroke of the intermediate push jack An intermediate pusher that can transmit the intermediate push propulsion force to the excavator at the top of the propulsion pipe row has been realized.

  FIG. 1 is a longitudinal sectional view illustrating an intermediate pressing device of the present invention. A stepped portion 3 having a small diameter is provided at the front tip portion, and the stepped portion 3 of the outer cylinder 2 configured by extending a long cylindrical front ring body 4 having a diameter substantially the same as the outer diameter of the propelling tube is provided at the front. And inserted into the rear collar (not shown) of the propulsion tube. A cylindrical intermediate cylinder 5 having a diameter inscribed in the front ring body 4 of the outer cylinder 2 and having substantially the same length is inserted into the front ring body 4 so that the front edge is brought into contact with the front wall surface of the front ring body 4. Install to touch. On the outer periphery of the front portion of the intermediate cylinder 5, two water-stopping materials 6 are mounted in the propulsion direction so as to be in close contact with the inner peripheral surface of the front ring body 4. In addition, two water-stopping materials 6 are attached to the rear inner periphery in the propulsion direction. It has a cylindrical rear cylinder 8 having a diameter smaller than the inner diameter of the intermediate cylinder 5 and substantially the same length as the front ring 4, and a cylindrical receptacle having the same diameter as the collar of the propulsion pipe at the rear. The front wall surface of the rear tube 8 of the insertion tube 7 formed by fixing the tube 9 is inserted through the intermediate tube 5 so as to contact the front wall surface of the front ring 4. The outer peripheral surface of the rear cylinder 8 is in close contact with the water-stopping material 6 that is installed on the rear inner surface of the intermediate cylinder 6 in the propulsion direction. An intermediate press connected to a reaction force fitting 10 installed on the inner side of the stepped portion 3 having a small diameter at the front end portion of the outer tube 2 and on the inner front portion of the receiving tube 9 of the plug-in tube 7 with a bolt or the like (not shown). A plurality of jacks 11 are installed. The intermediate pressing device of the present invention is configured as described above.

  In this embodiment, the water-stopping material 6 to be mounted on the front outer periphery and the rear inner periphery of the intermediate cylinder 5 is disclosed in two items. However, the water-stopping material 6 can be reliably increased and decreased depending on soil conditions, construction conditions and pipe diameter. Adjust as follows.

  After the completion of propulsion construction, the intermediate pushing device 1 from which the reaction force fitting 10 and the intermediate pushing jack 11 have been removed can be used as a sheath tube, and when assembled, a segment having an inner diameter equal to the inner diameter of the front and rear propulsion pipes, or the inner diameter of the front and rear propulsion pipes By lining the inner peripheral surface with cast-in-place concrete or the like placed so that the inner surface of the intermediate pushing device can be finished in the same manner as the inner surfaces of the front and rear propulsion pipes.

  FIG. 2 is a cross-sectional view illustrating the intermediate pressing device of the present invention. In the rear cylinder 8, an intermediate press connected by a bolt or the like to a reaction force fitting 10 installed on the inner side of the stepped portion 3 having a small diameter at the front end of the outer cylinder 2 and on the inner front part of the receiving cylinder 9 of the insertion cylinder 7. A plurality of jacks 11 are installed. A notch is provided on the front wall surface of the rear cylinder 8 as necessary so that the cylinder of the intermediate push jack does not contact. In the present embodiment, the case where twelve intermediate push jacks 11 are disclosed is disclosed. However, among the total propulsive force examined before construction, the capacity and number of the intermediate push jacks 11 are determined according to the propulsive force shared by the intermediate push device 1. Is decided.

FIG. 3 is a vertical cross-sectional view for explaining the operation status of the intermediate pressing device of the present invention. When the pushing force of the main push jack (not shown) installed in the start shaft is limited, a plurality of medium push jacks 11 installed in the middle push device 1 installed at a predetermined position of the propelling pipe row are operated. Then, the front and rear cylinders 12 are extended to push the outer cylinder 2 and the front propelling pipe row forward. At this time, since the intermediate cylinder and the rear cylinder inserted into the front ring body extend to become the outer shell of the intermediate pushing device, the inflow of earth and sand and groundwater into the intermediate pushing device is prevented. Moreover, the inflow of earth and sand, groundwater, etc. from a connection part is prevented by the water stop material 6 with which the intermediate | middle cylinder 5 was mounted | worn.
The reaction force of the force pushing out the front propelling tube row is applied to the outer peripheral frictional resistance force of the propelling tube row behind the intermediate pushing device. When the outer peripheral frictional resistance is small, it is dealt with by extending the main push jack installed in the start shaft and pushing the last end of the propelling pipe row.

  In the present embodiment, the number of the intermediate cylinders 5 installed is disclosed as one, but an inner intermediate cylinder having a diameter inscribed in the outer intermediate cylinder can be installed. The number of installations is determined by the body length and stroke length of the intermediate push jack.

  The operation of the intermediate pressing device 1 is basically performed in a straight section because a bending force acts on the extended intermediate press jack in the curved section and breaks. For this reason, the propulsive force is examined in advance, and the position where the intermediate pushing device is operated is planned not to enter the curved section.

  As described above, the intermediate pushing device of the present invention can extend the stroke of the intermediate pushing jack even if the length is substantially the same as that of the front and rear propelling pipes. It becomes.

DESCRIPTION OF SYMBOLS 1 Intermediate pushing apparatus 2 Outer cylinder 3 Step part 4 Front ring body 5 Intermediate cylinder 6 Water stop material 7 Insertion cylinder 8 Rear cylinder 9 Receptacle cylinder 10 Reaction force metal fitting 11 Intermediate push jack 12 Cylinder

Claims (1)

  In the intermediate pushing device to disperse the propulsive force that concentrates on the rear end face of the propulsion pipe in the propulsion method, it has a stepped part with a small diameter at the front tip, and extends a long cylindrical front ring at the rear. The step portion of the outer cylinder is inserted into the collar of the forward propelling tube, and has a cylindrical middle having a diameter smaller than the inner diameter of the front annular body of the outer cylinder and approximately the same length as the front annular body. Insert the front edge of the cylinder so as to contact the front wall surface of the front ring, and have a cylindrical rear cylinder having a diameter smaller than the inner diameter of the intermediate cylinder and approximately the same length as the front ring. And through the front wall surface of the rear tube of the insertion tube formed by fixing a cylindrical receiving tube having the same diameter as the collar of the propulsion tube on the rear side, the front wall surface of the front annular body To contact the reaction force fittings installed inside the stepped portion with a small diameter at the front end of the outer tube and inside the receiving tube of the insertion tube. By a plurality of installed during pressing device constituted by a Chu押 jack was.

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