KR20120113284A - Jacking pipe cushioning material, and jacking pipe - Google Patents

Abstract

The positioning material also provides a cushioning material for propulsion pipes, which can achieve a high stress dispersing effect. A plate member having at least a first side face 21 and a second side face 22 positioned at substantially a predetermined distance s, and an outer circumferential face 25 positioned at the outer circumferential side of both side faces; In the cushioning material 20 (cushion piece 20a) for the propulsion pipe forming a ring shape, the diameter (curvature radius) from the center L of the ring to the outer periphery 23 of the 1st side surface 21 is A, said. When the diameter (curvature radius) to the outer circumferential edge 24 of the second side surface 22 is B, and the diameter (curvature radius) to the arbitrary position in the axial direction of the outer circumferential surface 25 is C, A≥B And satisfy the condition of A> C.

Description

Cushioning material and propulsion pipe for propulsion pipe {JACKING PIPE CUSHIONING MATERIAL, AND JACKING PIPE}

The present invention relates to a cushioning material for propulsion pipes used in the joint of a propulsion pipe in a propulsion method and a propulsion pipe provided with the cushioning material.

As construction method of construction to embed pipe in the basement including public sewer construction, promotion method is widely adopted. The propulsion method is a construction method in which a pipe is buried in the ground by pushing concrete pipes sequentially into the ground without cutting the entire range of the pipes being buried. . Hereinafter, in this specification, the pipe embedded in the said underground is called "propulsion pipe."

As the material of the propulsion pipe used in the propulsion method, concrete, resin concrete, ceramic, iron are used. For this reason, when the propulsion tubes come into contact with each other when the propulsion tubes are pushed out, breakage is likely to occur in the contacted portions. In order to prevent damage to the propulsion pipe and to transmit propulsion force for pushing the propulsion pipe, an end of the propulsion pipe is mounted with a cushioning material for the propulsion pipe that functions as a propulsion force transmission material.

As the propulsion pipe cushion material, foamed polystyrene, plywood, or particleboard is used. Among these, expanded polystyrene having a specific characteristic that an arbitrary collapsing characteristic can be realized by changing the foaming ratio. A lot of cushion materials are used. A very suitable example of such a propulsion force transmission material is described in Patent Literature 1, and this propulsion force transmission material is a low-foaming molded article having a specific gravity of 0.3 to 0.8 as a foamed polystyrene, and is a plate member that forms a ring shape as a whole. .

On the other hand, the cushion material, which is an elastic material, causes swelling deformation in the radial direction due to the pressure acting upon propulsion. Therefore, there is a problem that if the width and the mounting position in the radial direction are not properly adjusted, they protrude outward from the propulsion tube in the radial direction. Protruding of the cushion material from the outer circumference of the propulsion pipe may deform a collar installed on the outer circumference of the propulsion pipe. Therefore, the width of the cushion material in the radial direction is made smaller than the thickness of the propulsion pipe in the past, Positioning was carried out so that it might not protrude from the surface, and a cushioning material was installed.

In the case of a large propulsion pipe whose outer diameter of the propulsion pipe exceeds 1 m, it is common to divide and shape a plurality of ring-shaped cushioning materials, and to attach them while positioning them with an adhesive or the like on the end face of the pipe. There was a problem in that work efficiency was bad, requiring great skill and requiring effort to press the adhesive until it dries in order to prevent misalignment. The cushioning material for concrete propulsion pipes which solved it is described in patent document 2. As shown in FIG.

As shown in FIG. 7, in the cushioning material 1 made of expanded polystyrene forming a plurality of rings, the protrusions 2 are formed on the outer circumferential portion thereof. The cushioning material 1 for concrete propulsion pipe 1 facilitates positioning by bringing the protrusion 2 of the outer periphery into contact with the collar provided on the outer periphery of the propulsion pipe, and further allows only the tip of the protrusion 2 to contact the collar. Therefore, the influence of the swelling caused by the collapse due to the poisson's ratio of the cushioning material generated at the time of propulsion can be limited only to a narrow area that is the tip of the protrusion 2, thereby preventing the collar from being deformed. have.

Japanese Patent Publication No. 61-8320 Japanese Patent Laid-Open No. 8-82192

The cushioning material for concrete propulsion tubes of the shape shown in FIG. 7 can effectively prevent the collar mounted on the propulsion tube from being deformed at the time of propulsion as described above. However, by forming projections on the outer circumference, a region without cushioning material is formed between the collar, and the area in contact with the end face of the propulsion pipe is narrower than the area without cushioning as compared with the area without cushioning material. Lose. Therefore, the dispersion of stress is suppressed and the stress acting on the end face of the propulsion pipe through the cushion material is concentrated over the entire surface of the end face as compared with the case where the cushion material is in surface contact. As a result, cushioning performance falls compared with the cushioning material which has surface contact with the front surface of the cross section of a propulsion pipe, and exhibits high stress dispersibility.

This invention is made | formed in view of the said situation, Comprising: Providing the cushioning material for propulsion pipes which are easy to position, and can also achieve a high stress-dispersion effect, and the propulsion pipe which fixed the cushioning material for propulsion pipes to the end surface of a collar-mounted side. Let's make it a task.

The cushioning member for propulsion pipes according to the present invention is a plate member having at least an outer circumferential surface located on the outer circumferential side of the first side, the second side, and both sides positioned substantially parallel at a predetermined distance, and the whole A cushioning material for a propulsion pipe forming a ring shape, the diameter from the center of the ring to the outer periphery of the first side being A, the diameter from the outer periphery of the second side being B to any position in the axial direction of the outer periphery When the diameter of C is C, it is A≥B and it is A> C, It is characterized by the above-mentioned.

In a preferable embodiment, the propulsion pipe cushion material according to the present invention is A> B, and the outer circumferential surface is a continuous inclined surface from the outer circumference of the first side to the outer circumference of the second side.

In the said propulsion pipe cushion material, the outer peripheral surface is located in radial direction inner side rather than the position of the outer peripheral edge of a 1st side surface and a 2nd side surface. Therefore, even if both or one of the outer periphery of the first side and the second side is in contact with the cylindrical collar attached to one end side of the propulsion tube, the outer circumferential surface does not touch the collar, but for the inner circumferential surface of the collar and the propulsion tube A space is formed between the outer peripheral surface of the cushion material.

Therefore, in the cushioning material for propulsion pipes by this invention, the position with respect to a propulsion pipe is made by making both or one of the outer periphery of a 1st side surface and a 2nd side contact with the cylindrical collar attached to one end side of a propulsion pipe. The crystal becomes easy, and the swelling in the radial direction of the cushioning material can be absorbed in the above-mentioned space, and the deformation of the collar due to the swelling can also be prevented.

Further, the cushioning material for propulsion pipes according to the present invention has a ring shape in its entirety and does not have protrusions or the like. Therefore, by disposing the front surface of the end face of the propulsion pipe on the side where the collar is mounted on the first side surface, stress dispersion acting on the end face of the propulsion pipe through the cushioning material at the time of construction is applied to the front end face of the propulsion pipe. Can be crazy Thereby, while the cushioning effect of the cushioning material for propulsion pipes is improved, damage to a propulsion pipe can be effectively avoided by concentration of stress.

The propulsion pipe cushion material according to the present invention can be obtained as an integrally molded article when the propulsion pipe to be applied is a propulsion pipe having a small outer diameter. However, when the outer diameter of the propulsion pipe is used for a large propulsion pipe exceeding 1 m, the propulsion pipe cushion material is preferably composed of two or more cushion material pieces having substantially the same shape divided in the circumferential direction. Even in that case, each cushion member is designed to satisfy the condition of A > B and A >

In the case where the cushioning member for propulsion pipe according to the present invention is composed of the plurality of cushion member pieces described above, the left and right side cross-sections of the respective cushion member pieces can be inclined cross sections. In this embodiment, when the ring-shaped propulsion pipe cushion material composed of a plurality of cushion pieces is compressed at the time of propulsion, the swelling in the circumferential direction of the cushion pieces is formed between the inclined side surfaces of the adjacent cushion pieces. It can absorb in the space of, and it can suppress the wave | waving and peeling which generate | occur | produce by pushing cushion material pieces together by swelling.

The present invention is also characterized in that a cylindrical collar is attached to one end side of the propulsion tube, and the cushioning material for any of the propulsion tube is fixed so that the first side is in contact with the end face of the side on which the collar is mounted. The propulsion pipe to be disclosed is also disclosed.

In this propulsion pipe, since the stress acting on the cross section can be effectively dispersed through the cushioning material for the propulsion pipe, it is possible to avoid the cross section side being damaged by the concentrated stress during construction. It is also possible to avoid deformation of the collar during propulsion.

ADVANTAGE OF THE INVENTION According to this invention, while positioning is easy, a high stress dispersion effect can also be expected, and the cushioning material for propulsion pipes which can further prevent the deformation | transformation of the collar attached to the propulsion pipe can be obtained. Moreover, the propulsion pipe which can avoid that a cross section is damaged by concentrated stress can be obtained.

1 is a cross-sectional view along the longitudinal direction of the propulsion pipe connecting portion using the cushioning material for propulsion pipe according to the present invention.
Figure 2 is a view for explaining the arrangement of the cushioning piece for propulsion pipe in the propulsion pipe according to the present invention.
Fig. 3 is a perspective view (Fig. 3 (a)) showing an example of a cushioning piece in a cushioning material for propulsion pipes according to the present invention, and a cross-sectional view (Fig. 3 (b)) along line bb in Fig. 3 (a).
Fig. 4 is a view corresponding to Fig. 3B showing another example of a cushioning piece in the cushioning material for propulsion pipes according to the present invention.
Fig. 5 is a perspective view (Fig. 5 (a)) showing another example of a cushioning piece in the cushioning material for propulsion pipes according to the present invention, and a cross-sectional view along the line bb of Fig. 5 (a) (Fig. 5 (b)).
FIG. 6 is a front view showing a part of the cushion member shown in FIG. 5 when connected in a ring shape; FIG.
The figure which shows an example of the conventional cushioning material for propulsion pipes.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

In FIG. 1, 10 is a cylindrical propulsion tube which is a concrete structure, for example, and L is a center axis line. The cylindrical collar 11 which consists of steel plates etc. is attached to the rear end (socket side) of the propulsion pipe 10A of the propulsion front side, and the propulsion pipe 10B of the propulsion rear side A slightly reduced front end (spigot side) of the inside of the collar 11. To the rear end face 12 of the front propulsion pipe 10A, the central axis is the central axis L, and the cushioning material for propulsion pipe 20 forming a ring shape is bonded using an adhesive or the like. At the time of propulsion, the front end of the rear propulsion pipe 10B enters into the collar 11 as described above, and the front end face 13 abuts against the propulsion pipe cushion material 20. In addition, the material of the propulsion pipe cushion material 20 may be the same as that of the propulsion pipe cushion material conventionally used, and is a low-foaming molded article which has a specific gravity of 0.3-0.8 as foamed polystyrene, for example. In addition, in FIG. 1, 14 is a suitable sealant, 15 is a buried part, such as mortar formed in the inner diameter side of the rear end surface of 10 A of propulsion pipes.

FIG. 2 is a cross-sectional view taken along the line aa of FIG. 1. In the illustrated example, the propulsion pipe cushion material 20 includes a plurality of substantially identical fan-shaped shapes (16 in the illustrated example) divided in the circumferential direction. It is comprised by the cushioning piece 20a. Hereinafter, the cushioning material 20 for propulsion pipe | tube of this invention is demonstrated using the cushioning piece 20a as an example.

As shown in FIG. 3, the fan-shaped cushion member 20a has a first side 21, a second side 22, an outer circumferential surface 25, and left and right sides positioned substantially parallel to each other at a predetermined distance s. It is a plate member of thickness s provided with end surfaces 26 and 27 and an inner circumferential surface 28.

The outer circumferential edge 23 of the first side face 21 and the outer circumferential edge 24 of the second side face 22 form an arc together, and the center of the arc, that is, as shown in FIG. The distance (curvature radius) A from the central axis L of the tube 10 to the outer periphery 23 of the first side 21 is the outside of the second side 22 from its central axis L. It is larger than the distance (curvature radius) B to the peripheral edge 24.

In the illustrated example, the outer circumferential surface 25 existing between the outer circumferential edge 23 and the outer circumferential edge 24 is an inclined surface that is continuously inclined toward the outer circumferential edge 24 from the outer circumferential edge 23. have. That is, when the distance (curvature radius) from the said central axis L to the arbitrary position of the said outer peripheral surface 25 in the direction of the center axis line L is set to C, it becomes A> C relationship. Although not required, in the illustrated example, the inner circumferential surface 28 forms a cylindrical surface.

In the cushioning piece 20a, the distance from the outer circumferential edge 23 to the inner circumferential surface 28 at the first side surface 21 is preferably the length in the radial direction of the rear end surface of the propulsion pipe 10A. It becomes almost the same. Moreover, in the example shown in FIG. 1, the embedding part 15 is formed in the inner diameter side of the rear end surface of 10 A of propulsion pipes, and the said outer periphery 23 in the 1st side surface 21 by that much. ), The distance from the inner circumferential surface 28 is shortened, but this is not required). The distance (curvature radius) A from the center axis L to the outer circumferential edge 23 of the first side surface 21 is from the center axis L at the rear end face 12 of the propulsion pipe 10A. The distance (curvature radius) D (refer FIG. 1) to the said collar 11 is made the same.

At the start of the propulsion method, the cushion member 20a is made to have the first side surface 21 side on the rear end surface 12 side over the entire circumference of the rear end surface 12 of the propulsion pipe 10A. Glue with adhesive. Since the radius of curvature A of the outer circumferential edge 23 of the first side face 21 is the same as the radius of curvature D of the outer circumferential edge abutting the collar 11 at the rear end face 12 of the propulsion pipe 10A, the operator By positioning all the cushioning pieces 20a while positioning the outer periphery 23 in contact with the collar 11, as shown in FIG. 2, a ring-shaped propulsion pipe cushion material consisting of sixteen cushioning pieces 20a. 20 can be formed easily. And the formed propulsion pipe cushion material 20 is in the state which covered the whole surface of the rear end surface 12 of the propulsion pipe 10A.

The propulsion pipe 10A is embedded in the ground, the propulsion pipe 10B is inserted into the collar 11 of the rear end thereof, and the propulsion method is continued. As shown in FIG. 1, the front end surface 13 of the rear propulsion pipe 10B abuts against the 2nd side surface 22 of the cushioning material 20 (cushion piece 20a) for propulsion pipes, and a cushion The thrust is transmitted while the reshape 20a is compressed. By compression, the cushioning piece 20a expands in the radial direction, and the expansion appears to push out the inclined outer circumferential surface 25 of the cushioning piece 20a outward. However, since the outer circumferential surface 25 is an inclined surface as described above, a space p is formed between the outer circumferential surface 25 and the inner circumferential surface of the collar 11 as shown in FIG. The part pushed outward is absorbed in the space p, and does not exert a great force on the collar 11. Therefore, the collar 11 does not deform | transform. The outer circumferential edge 23 of the first side face 21 is in contact with the inner circumferential surface of the collar 11, and the expansion to the outside of the portion acts as a force on the collar 11, but the contact area is small, so that the collar 11 It does not become a force to cause deformation.

Further, the propulsion force is transmitted to the forward propulsion pipe 10A through the first side 21 of the cushion piece 20a, but as described above, the first side 21 of the cushion piece 20a is the propulsion pipe ( It is possible to make surface contact with the front surface of the rear end face 12 of 10A, and at the time of construction, the stress acting on the rear end face 12 of the propulsion pipe 10A via the cushion member 20a is applied to the propulsion pipe 10A. It is possible to disperse the front surface of the rear end surface 12 of). Thereby, while the cushioning effect of the propulsion pipe cushion material 20 (cushion piece piece 20a) improves, damage to the propulsion pipe 10A due to concentration of stress can also be effectively avoided.

Although the magnitude relationship between the area | region of the 2nd side surface 22 of the cushioning piece 20a, and the area of the front end surface 13 of the propulsion pipe 10B may be arbitrary, the area of both sides is the same, or the 2nd side surface 22 may be sufficient as it. This slightly larger form is the preferred form.

FIG. 4: shows another form of the cushioning piece 20a in cross section, The same code | symbol is attached | subjected to the part corresponding to the cushioning piece 20a shown in FIG. In FIG. 4A, the above-described distance (curvature radius) A and the distance (curvature radius) B are the same. The outer circumferential surface 25 existing between the outer circumferential edge 23 and the outer circumferential edge 24 is composed of two inclined surfaces 25a and 25b which are inclined in the opposite directions, so that the substantially center portion in the width direction is the lowest. Inclined surfaces 25a and 25b are connected. In the cushioning piece 20a shown in FIG.4 (b), the said outer peripheral surface 25 has comprised the shape curved in arc shape toward the center from the cross-sectional shape.

FIG. 5: shows another form of the cushioning piece 20a in cross section. (A) is a perspective view, and (b) is sectional drawing along the b-b line | wire of (a). As for the cushioning piece 20a shown in FIG. 5, since the left and right side end surfaces 26a and 27a are the inclined surface which narrows the 2nd side surface 22 side, as shown to FIG. 5 (b), it is shown in FIG. It differs from the cushioning piece 20a shown. The other structure is the same, and the same code | symbol is attached | subjected to the same member.

FIG. 6: has shown the state at the time of bonding the several sheets of the cushioning piece 20a shown in FIG. 5 to the rear end surface 12 of the propulsion pipe 10A in ring shape, as shown in FIG. As shown in the figure, each cushion piece 20a is inclined in the direction in which the left and right side end surfaces 26a and 27a are narrower in the direction in which the second side face 22 is narrower than the first side face 21. V-shaped space p1 is formed between one side end surface 26a of the side), and the other side end surface 27a. When the ring-shaped propulsion pipe cushion material 20 is compressed at the time of propulsion, the cushion material piece 20a swells also in the circumferential direction, but the V-shaped space p1 can absorb the swelling in this circumferential direction. Therefore, in the cushion member piece 20a of this aspect, the wave and peeling which generate | occur | produce by pushing the cushion member pieces together by swelling can be suppressed.

L… Central axis of propulsion pipe
10, 10A, 10B... Propulsion pipe
11 ... color
12... Rear section of propulsion pipe
13 ... Shear surface of propulsion pipe
20... Ring-shaped propulsion pipe cushion
20a... Cushion reorganization which comprises cushioning material for propulsion pipe
21 ... First side
22... Second side
23 ... Outer periphery of the first side
24 ... Outer periphery of the second aspect
25... Outer circumference
26, 27... Left and right side cross section
28 ... Inner circumferential surface
L… Central axis of propulsion pipe
A… Distance (curvature radius) from the central axis L of the cylindrical propulsion tube to the outer circumference of the first side
B… Distance (curvature radius) from the central axis L of the cylindrical propulsion tube to the outer periphery of the second side
C… Distance from the central axis L of the cylindrical propulsion pipe to an arbitrary position in the direction of the center axis L of the outer circumferential surface
D… Distance (curvature radius) from center axis L to collar at rear end of propulsion pipe

Claims (5)

A plate member having at least an outer circumferential surface located on the outer circumferential side of the first side, the second side, and both sides positioned at substantially parallel at a predetermined distance, and a cushioning member for the propulsion pipe, which has a ring shape as a whole. ,
Diameter from the center of the ring to the outer periphery of the first side (curvature radius) A, diameter to the outer periphery of the second side (curvature radius) B, and diameter from any position in the axial direction of the outer circumferential surface When (curvature radius) is set to C, it is A≥B and A> C, The cushioning material for propulsion pipes characterized by the above-mentioned. The method of claim 1,
A> B, The said outer peripheral surface becomes a continuous inclined surface toward the outer peripheral edge of a 2nd side from the outer peripheral edge of a 1st side surface, The cushioning material for propulsion pipes characterized by the above-mentioned. The method according to claim 1 or 2,
A cushioning pipe for propulsion pipes, comprising: two or more cushioning pieces of substantially the same shape divided in the circumferential direction, wherein each cushioning piece is A? B and satisfies the condition A? C. The method of claim 3,
Each cushion member piece is a cushioning member for propulsion pipes, characterized in that both end surfaces thereof are inclined surfaces. The cylindrical collar is attached to one end side of the propulsion pipe, and the first side is brought into contact with the end face of the side on which the collar is mounted, according to any one of claims 1 to 4. A propeller pipe, characterized in that the cushioning material for one propeller pipe is fixed.

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