JPH1161776A - Mounting method of asphalt mat to caisson bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting method of an asphalt mat to a caisson bottom capable of mounting the asphalt mat without inverttng the caisson. SOLUTION: The ground 11 is levelled to lay a separation material 14 with an asphalt mat, spacer blocks 15 are arranged to provide reinforcing materials 16 on them, reinforcing bars are inserted in through-holes 18 of the reinforcing materials 16 formed in advance to arrange, the periphery of a caisson bottom is surrounded by a form. The asphalt mat is cast up to the upper surfaces of the reinforcing materials 16 to mold the asphalt mat, a caisson bottom plate having mounting holes therein is mounted on the reinforcing materials 16, it is stud welded on the reinforcing materials 16 from the mounting holes, and the caisson bottom plate and reinforcing materials 16 are fastened. By the constitution, the asphalt mat can be mounted without inverting a caisson block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching an asphalt mat to the bottom of a caisson, and relates to a method of mounting an asphalt mat on a bottom of a caisson without reversing to increase a coefficient of friction with a rubble foundation on the seabed ground. It is intended to be attached.

[0002]

2. Description of the Related Art In order to reduce offshore construction work when constructing breakwaters, seawalls, quays, etc., caisson is manufactured on land and transported to a marine site for installation. Instead of a concrete caisson, various caissons are used as shown in FIG. For example, FIG. 1A shows a steel caisson 1, which is composed of a steel material 1a serving as a framework and a steel plate 1b covering the outside thereof. FIG. 2B shows a hybrid caisson 2, which is composed of a framework 2a made of a steel material and a steel plate and a reinforced concrete 2b covering the outside thereof. Further, FIG.
′) Is a steel / reinforced concrete caisson 3 in which the bottom of the caisson is a steel caisson 3a and the upper part of the caisson is a reinforced concrete caisson 3b. It is configured. Also,
FIG. 3D shows a hybrid / reinforced concrete caisson 4, in which the bottom of the caisson is a hybrid caisson 4 and the top of the caisson is a reinforced concrete caisson 4b. FIG. 5E shows a hybrid caisson 5 made of hybrid, reinforced concrete, and steel. The bottom of the ason is a reinforced concrete caisson 5a, the middle is a hybrid caisson 5b, and the top is a constituent caisson 5c.
It is composed of

[0003] These caissones 1 to 5 (hereinafter simply referred to as caissons) in place of such concrete caissons are lighter than concrete ones and are constructed on the ground at the installation site. If it is installed as is on a rubbled foundation, slipping may occur. As shown in FIG. 5, an asphalt mat 6 having a large coefficient of friction is interposed at the bottom of the caisson to reduce the wave force of the caisson.
Stabilization is performed by increasing the hydrodynamic resistance against earth pressure and horizontal pressure during an earthquake.

Conventionally, in order to interpose an asphalt mat between the bottom of such a caisson and a rubble foundation, an asphalt mat has been previously attached to the bottom of the caisson, and the caisson is manufactured by blocking. The block is turned upside down, a formwork is provided, reinforcing reinforcement is provided, and then an asphalt mat is cast and attached.

[0005]

However, with the caisson reversing method, it is necessary to reinforce the caisson block so that it does not hinder the reversal of the caisson block, and the block itself cannot be made too large. However, there is a problem that the blocks must be joined.

Further, since the caisson is divided into blocks, the asphalt mat is also divided and attached to each block, and there is a problem that the gaps at the joints between the asphalt mats must be filled with asphalt by pouring asphalt.

[0007] In addition, in order to reverse or restore the caisson block, a hoist ship and a large crane are required.
A jig for reversing is also required, and there is a problem that a great deal of preparation and equipment are required, and the construction period is long.

Further, there is a problem that the work of lifting and turning the caisson block is dangerous, and the setting of the asphalt mat on the caisson block is a work at a high place, which is dangerous.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art, and has as its object to provide a method of attaching an asphalt mat to the bottom of a caisson in which the asphalt mat can be attached without turning over the caisson. .

[0010]

In order to solve the problems of the prior art, a method of attaching an asphalt mat to the bottom of a caisson according to claim 1 of the present invention is to provide an asphalt mat after leveling the ground on which the caisson is manufactured. And a spacer block for supporting the reinforcing material of the asphalt mat, and then disposing the reinforcing material on these spacer blocks, and inserting them into through holes formed in these reinforcing materials to reinforce them. After arranging reinforcing bars for the caisson, surrounding the bottom of the caisson with a mold, and after asphalt mat is driven into the mold to the upper surface of the reinforcing material, mounting holes are formed corresponding to the reinforcing material. The caisson bottom plate is placed on the reinforcing member, and the caisson bottom plate is fastened to the reinforcing member by stud welding from the mounting hole of the caisson bottom plate to the reinforcing member. And it is characterized in and.

According to the method of attaching the asphalt mat to the bottom of the caisson, the ground for manufacturing the caisson is laid down and a release material from the asphalt mat is laid so that the caisson can be sequentially manufactured from the bottom to the top. Arrange the spacer block so that the reinforcing material can be embedded in the mat, arrange the reinforcing material on these, and insert reinforcing steel into the through hole of the preformed reinforcing material and arrange reinforcing bars Surrounding the bottom of the caisson with a mold, forming an asphalt mat into this mold by casting an asphalt mat up to the top of the reinforcing material and forming mounting holes in the caisson bottom plate corresponding to the arrangement of the reinforcing material. Put it on the asphalt mat formed reinforcing material, stud weld it to the reinforcing material from the mounting hole of this caisson bottom plate, and use this stud bolt And so as to fasten the caisson bottom plate and the reinforcing member Te, it is possible to manufacture the caisson bottom without asphalt mat is attached to reversing the caisson blocks.

According to a second aspect of the present invention, in the method of attaching an asphalt mat to the bottom of a caisson, in addition to the configuration of the first aspect, the spacer block is formed of the same material as the asphalt mat to be cast. It is characterized by the following.

According to this method of attaching the asphalt mat to the bottom of the caisson, the spacer block supporting the reinforcing material embedded in the asphalt block is made of the same material as the asphalt mat, and can be integrated by casting the asphalt mat. The same asphalt mat as in the case of the inversion method can be mounted.

Further, the method for attaching an asphalt mat to the bottom of a caisson according to claim 3 of the present invention is described in claim 1.
Or in addition to the configuration described in 2, wherein after the asphalt mat is cast, the upper surface of the reinforcing material is cleaned and asphalt primer is applied, and then the caisson bottom plate is placed.

According to this method of attaching the asphalt mat to the bottom of the caisson, after the asphalt mat is cast, the upper surface of the reinforcing material is cleaned and the asphalt primer is applied, and then the caisson bottom plate is placed. Work such as stud welding in the next step can be easily performed.

According to a fourth aspect of the present invention, there is provided a method for attaching an asphalt mat to a caisson bottom.
3. In addition to the configuration according to any one of 3, the water blocking member is mounted in the mounting hole of the caisson bottom plate after the caisson bottom plate is placed on the upper surface of the reinforcing member and until the stud welding. It is assumed that.

According to the method of attaching the asphalt mat to the bottom of the caisson, a water-blocking member is previously attached to the attachment hole of the caisson bottom plate placed on the upper surface of the reinforcing material, and the asphalt mat is attached to the asphalt mat until the stud welding. Rainwater and the like can be prevented.

Further, the method for attaching an asphalt mat to the bottom of a caisson according to claim 5 of the present invention is as defined in claim 1.
In addition to the configuration described in any one of the above-described embodiments, a watertight caulking material is filled in the mounting hole when fastening the caisson bottom plate and the reinforcing material.

According to the method of attaching the asphalt mat to the bottom of the caisson, the fastening hole around the stud bolt is filled with the water-tight caulking material when the caisson bottom plate and the reinforcing material are fastened. This prevents rainwater from entering the asphalt mat.

The method for attaching an asphalt mat to the bottom of a caisson according to claim 6 of the present invention is described in claims 1 to 5.
5. In addition to the configuration according to any one of 5, the caisson bottom plate is any one of a steel caisson, a hybrid caisson, a steel / reinforced concrete caisson, a hybrid / reinforced concrete caisson, or a hybrid / reinforced concrete / steel caisson. It is a feature.

According to the method of attaching the asphalt mat to the bottom of the caisson, any one of a steel caisson other than a concrete caisson, a hybrid caisson, a steel / reinforced concrete caisson, a hybrid / reinforced concrete caisson or a hybrid / reinforced concrete / steel caisson is used. It can be applied to a caisson, and a caisson bottom with an asphalt mat can be manufactured without inversion.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 are a series of process drawings according to an embodiment of a method for attaching an asphalt mat to a caisson bottom according to the present invention.

In this method of mounting the asphalt mat on the bottom of the caisson, the method of mounting the asphalt mat in the conventional manner in which the bottom block of the caisson is inverted is used instead of the bottom of the caisson, and the caisson is manufactured sequentially from the lower side to the upper side. Yes, the steps will be sequentially described with reference to the drawings.

(1) First, the ground on which the caisson is to be manufactured is prepared (see FIG. 1A). The ground 11 of the factory where the caisson is manufactured is leveled using the compaction roller 12 and the like, and the level level 13 is used to confirm that the levelness is within the allowable range of the asphalt mat construction thickness.

(2) A release material 14 for preventing adhesion between the ground and the asphalt mat is spread on the ground 11 (see FIG. 1B). As the release material 14,
Any material that can prevent the asphalt mat from adhering to the ground may be used. For example, asphalt roofing is laid, but other paper or the like may be used.

(3) A spacer block 15 for supporting a reinforcing material is placed on the spread material 14 (see FIG. 1C). The spacer block 15 forms a part of the surface of the completed caisson asphalt mat and is for supporting the reinforcing material of the asphalt mat away from the ground 11 so as to be embedded in the asphalt mat. For example, a rectangular block is made of, for example, asphalt, rubber, or mortar, and is installed at a crossing portion of the reinforcing member 16. Here, by using an asphalt block made of the same material as the asphalt mat, the asphalt mat can be integrated with an asphalt mat to be cast later and formed, and the friction coefficient of this portion is not different from other portions.

(4) A reinforcing material 16 is framed on the spacer block 15 in a grid pattern (see FIG. 1D).

The reinforcing member 16 is buried in the asphalt mat to reinforce it, and at the same time, has the function of connecting and fixing to the bottom plate of the caisson. In this case, an L-shaped steel (angle material) is used, and one side is vertically As shown in FIG. 4, one intermittent reinforcing member 16 is arranged in an inverted L-shape such that one side is a horizontal upper surface and arranged in a lattice.
Is a length in contact with the horizontal upper surface, and the connecting piece 17 is applied to the back surface, and the vertical sides are welded to form a grid.

The reinforcing member 16 has through-holes 18 through which reinforcing steel is passed in advance at predetermined intervals on each of the lattice-shaped vertical sides. The through-holes 18 are used to separate the reinforcing bars 16 from the ground. The arrangement of the bar is made possible.

Note that the spacer block 15
The load may be made uniform by placing an iron plate or the like on the reinforcing member 16 and then placing the reinforcing member 16 thereon.

(5) Reinforcing reinforcement for reinforcement (FIG. 2)
(A)). Reinforcing bars 19 are arranged in a lattice pattern between reinforcing members 16 through through holes 18 formed on the vertical sides of the reinforcing members 16 framed in a lattice shape, and the crossing portions of the reinforcing bars 19 are wire-bonded as necessary. Tighten. By doing this,
Reinforcing bars can be more finely arranged in a lattice in the lattice of the reinforcing member 16.

(6) A mold for setting the outer shape of the asphalt mat is installed (see FIG. 2 (b)). A formwork 20 for defining the outer shape of the asphalt mat to be attached to the bottom of the caisson is arranged so as to surround the outside of the lattice-shaped frame portion in which the reinforcing members 16 and the reinforcing bars 19 are arranged. Here, the L-shaped steel is used, and the mold 2
Set 0.

(7) The asphalt mat is cast into the mold (see FIG. 2 (c)). Formwork 2 thus formed
The asphalt mat 21 is cast up to the upper surface of the reinforcing member 16 in the area 0. The method of placing the asphalt mat 21 is the same as the conventional case where the caisson bottom block is turned upside down.

In this case, the asphalt mat 21 is cast in two layers, and the first layer is cast almost to the center of the reinforcing bar 19 to form a lower half layer. An upper half layer is cast as the second layer so that it is flush with the upper surface of the reinforcing member 16.

Therefore, this asphalt mat 21
After the casting, the upper surface of the reinforcing material 16 is exposed, and the asphalt mat 21
Are filled to form one plane.

At the time of placing the asphalt mat 21,
Bolts and anchors do not project at all on the upper surface of the reinforcing member 16 in the formwork 20 and are flat, so that the asphalt mat 21 can be easily driven and leveled, and the reinforcing member 16 What is necessary is just to fill the asphalt mat 21 except for the upper surface. For example, a nut for fastening to a caisson is previously attached to the lower side of the reinforcing material so that the asphalt mat does not enter the asphalt mat. 21 can be cast.

(8) If necessary, clean the upper surface of the reinforcing member 16 and apply asphalt primer (FIG. 2).
(D)). The asphalt mat 21 may adhere to the upper surface of the reinforcing material 16 with the placement of the asphalt mat 21. Since the stud bolt is welded to the upper surface of the reinforcing material 16 in a later process, the upper surface of the reinforcing material 16 is cleaned. It is necessary to apply the asphalt primer after performing keeling.

Note that this step is not always necessary, and may be a step that can be incorporated according to the state of the surface of the reinforcing member 16.

Thus, the molding of the asphalt mat 21 to be attached to the bottom of the caisson is completed.

(9) The bottom of the caisson is mounted on the reinforcing member 16 (see FIG. 3A). In parallel with the formation of the asphalt mat 21 already described, the bottom plate 22a of the caisson
Is manufactured in advance. In the bottom plate 22a of the caisson bottom slab block 22, mounting holes 23 are formed in advance at a predetermined pitch corresponding to the lattice-like arrangement of the reinforcing members 16 of the asphalt mat 21.

The caisson bottom slab block 22 is connected to the reinforcing material 1
6 and each mounting hole 23 is asphalt mat 2
The reinforcing member 16 is installed so as to be positioned on the upper surface of the reinforcing member 16. However, since the upper surface of the reinforcing member 16 is manufactured to have a certain width, for example, a state in which a bolt is previously attached to the reinforcing member side is used. However, the positioning can be performed more easily than when the mounting holes 23 of the caisson bottom plate are aligned.

Before mounting the caisson bottom slab block 22 on the reinforcing member 16, the water blocking member 24 is inserted into each mounting hole 23.
To prevent infiltration of rainwater and the like until the stud welding in the later process. As the water blocking member 24, for example, it is only necessary to attach a gum tape, and the mounting hole 23 is required.
Should be covered.

(10) Stud welding is performed on the stud bolt (see FIG. 3B). A stud bolt 25 is stud-welded from the mounting hole 23 of the caisson bottom slab block 22 to the upper surface of the reinforcing member 16 of the asphalt mat 21.

At this time, if the water blocking member 24 is previously mounted in the mounting hole 23 of the caisson bottom slab block 22,
The welding of the stat bolt 25 is performed while removing the water blocking member 24 each time.

In the stud welding, since a certain width is secured on the upper surface of the reinforcing member 16, the alignment between the reinforcing member 16 of the asphalt mat 21 and the mounting hole 23 of the caisson bottom slab block 22 is not exact. In both cases, the stud bolt 25 can be sufficiently welded.

In this way, stud welding of stud bolts is performed on all of the many mounting holes 23 arranged in a lattice.

(11) Fasten the caisson bottom plate block to the stud bolt (see FIG. 3 (c)). When the asphalt mat 21 and the caisson bottom slab block 22 are fastened using the stud bolts 22, this fastening is performed when the asphalt mat 21 does not come off at the bottom of the caisson during marine transportation, etc., and the caisson is installed on a rubble foundation. If the asphalt mat 21 is interposed, the function is achieved.

Therefore, the mounting hole 23 of the caisson bottom plate 22a is
Watertight caulking material 26 around stud bolt 25
And tightened with a nut 28 through a washer set 27 consisting of a square washer and a spring washer.

The fastening operation may be performed sequentially from the point where the welding of the stud bolt is completed.

By filling such a watertight caulking material 26 and tightening it with the nut 28, infiltration of rainwater or the like can be prevented, and an increase in the load on the asphalt mat 21 at the time of lifting a caisson or the like can be prevented. .

(12) Seal welding of the periphery of the caisson bottom plate is performed (see FIG. 3D). Finally, caisson bottom plate 22
Seal welding is performed between the peripheral edge of a and the peripheral edge of the reinforcing member 16 of the asphalt mat 21. The seal welded portion 29 prevents infiltration of rainwater or the like.

The above steps complete the installation of the asphalt mat on the bottom of the caisson.

Thereafter, another block is constructed on the caisson bottom slab block to complete the caisson.

According to such a method of attaching the asphalt mat to the bottom of the caisson, the asphalt mat can be attached without inverting the caisson block, and the work can be performed safely and easily without lifting work or work at high places. can do.

In addition, a caisson bottom block can be manufactured in parallel with the asphalt mat mounting process.
The construction period can be shortened, and since the bottom slab block is not inverted, there is no need to divide the bottom slab block, and the joining of the bottom slab blocks and the asphalt mats is unnecessary.

Further, the upper surface of the asphalt mat can be horizontally and flatly constructed, and the construction quality of the caisson block constructed thereon can be improved.

Further, the asphalt mat can be mounted without the necessity of a jig or a large-sized machine required for the inversion.

The method of attaching the asphalt mat to the bottom of the caisson can be applied to the above-described caissons 1 to 5 in FIG. 5 other than the concrete caisson. May be provided with a bottom plate made of an iron plate at the bottom of the caisson.

[0059]

According to the method for attaching an asphalt mat to the bottom of a caisson according to the first aspect of the present invention, as described above in detail with reference to one embodiment, the ground on which the caisson is manufactured is leveled to asphalt. Laying the release material from the mat, arranging spacer blocks so that the reinforcement can be buried in the asphalt mat, arranging the reinforcement on these, and inserting reinforcing steel into the through holes of the preformed reinforcement Insert reinforcement for reinforcement, surround the bottom of the caisson with a formwork, cast an asphalt mat into the formwork up to the top of the reinforcing material, form the asphalt mat, and place the reinforcing material on the caisson bottom plate. A mounting hole is formed corresponding to the arrangement, and the mounting hole is placed on a reinforcing material on which an asphalt mat is formed, and stud welding is performed on the reinforcing material from the mounting hole of the caisson bottom plate. Since so as to fasten the caisson bottom plate and the reinforcing material with Taddoboruto, can be installed without the asphalt mat inverting the caisson blocks can sequentially made from the bottom of the caisson towards the top.

According to the method of attaching the asphalt mat to the caisson bottom according to the second aspect of the present invention, the spacer block for supporting the reinforcing material embedded in the asphalt block is made of the same material as the asphalt mat. The asphalt mat can be integrated by casting the asphalt mat, and the same asphalt mat as in the case of the reversing method can be easily attached.

Further, according to the method of attaching the asphalt mat to the bottom of the caisson according to the third aspect of the present invention, after the asphalt mat is cast, the upper surface of the reinforcing material is cleaned and the asphalt primer is applied, and then the caisson bottom plate is applied. The work such as stud welding in the next step is facilitated.

According to the method for mounting an asphalt mat on the bottom of a caisson according to a fourth aspect of the present invention, the water-blocking member is mounted in advance in the mounting hole of the caisson bottom plate placed on the upper surface of the reinforcing member. In addition, it is possible to prevent rainwater and the like from entering the asphalt mat until the stud welding.

Further, according to the method for attaching an asphalt mat to the bottom of a caisson according to the fifth aspect of the present invention, a water-tight caulking material is attached to a mounting hole around a stud bolt when fastening a caisson bottom plate to a reinforcing member. Since the filling is performed, infiltration of rainwater or the like into the asphalt mat can be more reliably prevented.

According to the method of attaching an asphalt mat to the bottom of a caisson according to claim 6 of the present invention, a steel caisson other than a concrete caisson, a hybrid caisson, a steel / reinforced concrete caisson, a hybrid / reinforced concrete caisson or a hybrid It can be applied to any caisson of reinforced concrete or steel caisson, and can produce a caisson bottom with an asphalt mat attached without inversion.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front third process diagram according to an embodiment of a method for attaching an asphalt mat to a caisson bottom according to the present invention.

FIG. 2 is a process diagram of an intermediate third according to an embodiment of the method for attaching an asphalt mat to a caisson bottom according to the present invention.

FIG. 3 is a process diagram of the latter half of the third embodiment according to the embodiment of the method for attaching an asphalt mat to the bottom of a caisson according to the present invention.

FIG. 4 is a perspective view of a crossing portion of a reinforcing material according to the embodiment of the method for attaching an asphalt mat to a caisson bottom according to the present invention.

FIG. 5 is an explanatory view of various caissons other than a concrete caisson to which the present invention is applied.

[Explanation of symbols]

 1-5 caisson 11 ground 12 pressure roller 13 level level 14 release material 15 spacer block 16 reinforcing material 17 connection piece 18 through hole 19 reinforcing bar 20 formwork 21 asphalt mat 22 caisson bottom plate block 22a bottom plate 23 mounting hole 24 water blocking member 25 Stud bolt 26 Watertight caulking material 27 Washer set 28 Nut 29 Seal weld

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomokazu Kaneko 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries, Ltd. East 2 Technical Center (72) Inventor Yoshi Arima 2-chome, Akasaka, Minato-ku, Tokyo No. 9 Inside Japan Marine Construction Co., Ltd. (72) Iwatsu Tsukui 2-10-9, Akasaka, Minato-ku, Tokyo Nippon Marine Construction Co., Ltd. (72) Yoshikazu Tsukada 2-chome, Akasaka, Minato-ku, Tokyo No. 9 Inside the Nihon Marine Construction Co., Ltd.

Claims (6)

[Claims] After the ground for producing a caisson is prepared, a separating material from an asphalt mat is laid, and then a spacer block for supporting a reinforcing material of the asphalt mat is disposed, and the reinforcing material is disposed on the spacer block. The reinforcing bars are inserted into the through-holes formed in these reinforcing members to arrange reinforcing steel, and the periphery of the bottom of the caisson is surrounded by a mold, and an asphalt mat is struck in the mold to the upper surface of the reinforcing material. After the installation, a caisson bottom plate having a mounting hole formed corresponding to the reinforcing member is placed on the reinforcing member, and stud welding is performed on the reinforcing member from the mounting hole of the caisson bottom plate, thereby reinforcing the caisson bottom plate. A method of attaching an asphalt mat to the bottom of a caisson, which is characterized by fastening a material. 2. The method for attaching an asphalt mat to a caisson bottom according to claim 1, wherein the spacer block is formed of the same material as the asphalt mat to be cast. 3. After placing the asphalt mat,
3. The method for attaching an asphalt mat to the bottom of a caisson according to claim 1, wherein the upper surface of the reinforcing material is cleaned and asphalt primer is applied, and then the caisson bottom plate is placed. 4. The water-blocking member is mounted in the mounting hole of the caisson bottom plate after the caisson bottom plate is placed on the upper surface of the reinforcing member until the stud welding is performed. 3. The method for attaching an asphalt mat to the bottom of a caisson according to any one of 3. 5. The asphalt as claimed in claim 1, wherein a water-tight caulking material is filled in the mounting hole when the caisson bottom plate is fastened to the reinforcing material. How to attach the mat. 6. The caisson bottom plate is a steel caisson, a hybrid caisson, a steel / reinforced concrete caisson,
The method for attaching an asphalt mat to a caisson bottom according to any one of claims 1 to 5, wherein the caisson bottom plate is any one of a hybrid / reinforced concrete caisson or a hybrid / reinforced concrete / steel caisson.