JPH0348968B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for constructing a pedestal on the ground surface, particularly for mooring or fixing a work vessel, mechanical equipment, scaffolding for water work, caissons, etc. , mainly relates to a method of constructing a pedestal on the surface of underwater ground.

[Prior Art] Conventionally, in order to moor work vessels, barges, etc., anchors for the mooring ropes have been required to prevent them from moving and to secure the work scaffolding.
A submerged anchor and a buried anchor are used as this anchor. However, buried anchors are mainly used as anchors for mooring lines because of the high installation cost and the installation work being restricted by tidal currents and ground conditions.

[Problem to be solved by the invention]

However, in the case of conventional buried anchors,
When an instantaneous impact force is applied to the mooring line, damage may spread to the buried anchor body, and when the mooring line breaks, it is troublesome to replace the mooring line.

In addition, when installing steel pipes for work scaffolding etc. in underwater ground, conventionally, a hole is drilled in the ground using a drilling machine, the steel pipe is built into the hole, and then a hardening material such as concrete is filled. A method has been adopted in which the ground and steel pipes are integrated.

However, this method requires huge drilling equipment and has problems such as water pollution caused by the excavation.

Furthermore, when installing machinery and equipment on underwater ground, anchor bolts must be buried in the foundation concrete, which poses a technical problem in that the work is difficult.

This invention was made in order to solve such conventional problems, and its purpose is to facilitate the construction of a pedestal that forms an anchor and to reduce its cost, and its purpose is to: The purpose is to construct a pedestal that can securely moor or fix work vessels, machinery and equipment, steel pipes for work scaffolding, etc., and the purpose is to prevent damage to the entire structure even if an instantaneous impact is applied to the latching hardware. The goal is to construct a pedestal that can be easily reused without having to do so.

[Means to solve the problem]

The construction method of the present invention will be explained with reference to the drawings. Cast-in-place concrete 6 is poured into the excavated portion 5 formed by excavating the surface of the ground 1 to make the surface of the ground 1 flat. Forming a continuous vertical hole 7 between the concrete 6 and the ground 1 below, filling the vertical hole 7 with a hardening material 8 such as cement mortar, and inserting the anchor material 2 to fix the anchor material 2 to the ground 1, Next, a base 3 made of precast concrete with a flat lower surface, a vertical hole 9 formed therein corresponding to the anchor material 2, and a latching fitting 4 planted upward is attached to the upper part of the anchor material 2. The anchor material 2 is placed on the upper surface of the cast-in-place concrete 6 while matching the vertical hole 9 of the base 3, and then the upper part of the anchor material 2 and the base 3 are fixed.

[Effect]

In order to place cast-in-place concrete 6 on the lower side of the base 3, it is possible to create a foundation that corresponds to the location where the pedestal is installed, and the base 3 placed on the top surface is made of precast concrete. The construction work is made easier because it uses materials.

In addition, the lower surface of base space 3 and cast-in-place concrete 6
Since the top surface is flat, the base 3 may be damaged by the force applied to the base 3 when fixing the base 3 using the anchor material 2 or when using the base after the base is completed.
Since the stress generated between the base 3 and the concrete 6 is distributed over the entire joint surface between the two, there is no risk of damage to the base 3.

Furthermore, since the base 3 is fixed to the ground 1 via the anchor material 2 and the hardening material 8, it is reliably fixed to the ground 1 and can sufficiently withstand various uses of the pedestal.

〔Example〕

The present invention will be explained below based on illustrated embodiments. 1 to 4 are diagrams showing a first embodiment, in which a metal fitting for hanging a mooring rope 10 is used as the hanging metal fitting 4. That is, 3 is a base, which is made of a precast concrete plate whose lower surface is flat, has a plurality of vertical holes 9 formed therethrough, and has latches 4 implanted therein. The latching fitting 4 consists of a lower horizontal bar and an inverted U-shaped latching portion welded to the upper side of the horizontal bar, and the latching member 4 is embedded within the base 3 and is connected to the inverted U-shaped latching portion. A hook 11 at the end of the cable rope 10 is hooked to the portion. Although the base 3 has a rectangular planar shape in this embodiment, it can have a different shape depending on the usage, the magnitude of the load, and other conditions.

The base 3 is placed on the upper surface of cast-in-place concrete 6 that forms a part of the underwater ground 1 and is used to level the upper surface of the ground 1. The cast-in-place concrete 6 is made by pouring concrete into an excavated portion 5 formed by excavating the bottom flat, and uses this as a foundation, and has a flat top surface. In addition, a plurality of vertical holes 7 are excavated in the cast-in-place concrete 6 and the ground 1 below it, and the anchor material 2 is fixed to the vertical hole 7 with a hardening material 8, so that the anchor material 2 is attached to the ground 1. It is kept fixed.

The anchor material 2 is made of a steel rod, and its upper end projects upward through the vertical hole 9 of the base 3 beyond the cast-in-place concrete 6, and a male thread is formed in the projecting portion. And nut 12 to this male thread.
are screwed together, and the base 3 is crimped and fixed to the upper surface of the cast-in-place concrete 6. It goes without saying that the anchor material 2 is not just a steel rod, but may also be an expandable anchor that can be reliably installed underwater and has sufficient fixing properties. In this way, the base 3 is rigidly connected to the ground 1 and constitutes a pedestal A on the ground surface.

An example of the procedure for constructing such a pedestal A will be explained based on FIG. 3. As shown in FIG. 5, and then, as shown in FIG. Level the surface.

Next, as shown in FIG.
A vertical hole 7 is excavated in the ground 1 using a drill. Vertical hole 7
are continuously excavated into the cast-in-place concrete 6 and the ground 1 below, and are formed at a plurality of locations. Then, as shown in Figure d, the vertical hole 7 is filled with hardening material 8 and the anchor material 2 is inserted to fix the anchor material 2 to the ground 1. As the hardening material 8, a known material such as cement mortar is used.

Then, as shown in Figure e, the base 3 is placed on the top surface of the cast-in-place concrete 6. The base 3 has the above-mentioned structure, and the upper end of the anchor material 2 is connected to the vertical hole 9.
The base 3 is lowered and placed on the upper surface of the cast-in-place concrete 6 so that it is inserted into the concrete 6. Then, screw the nut 12 onto the upper end of the anchor material 2, and
Pedestal A is completed by pressing and fixing to the upper surface of cast-in-place concrete 6. Here, since the lower surface of the base 3 and the upper surface of the cast-in-place concrete 6 are both flat, the anchor material 2 and the nut 12
When the base 3 is fixed by fastening, the stress generated between the base 3 and the cast-in-place concrete 6 is dispersed over the entire joint surface between the two. Therefore, there is no risk of damage to the base 3 due to stress concentration. A hook 11 of a cable rope 10 is hooked to the hook 4 to moor a ship or the like at the other end of the cable rope 10.

FIG. 4 shows how the working scaffold 13 and the working barge 14 are moored to the pedestal A constructed as described above. The other end of the cable rope 10, one end of which is connected to the working scaffold 13 and the working barge 14, is hooked to a hook 4 of a pedestal built on the ground 1, which is the bottom of the water. The work barge 14 is positioned at a predetermined position.

Here, when tidal currents, wind pressure, etc. affect the work scaffold 13 and the work barge 14 and tension is applied to the rope 10, the rope 10 is attached to the base 3 via the hook 11 and the latch 4. However, since the base 3 is fixed to the ground 1 via the anchor material 2 and the hardening material 8, it supports the tensile force of the cable rope 10 and supports the work scaffold 13 and the work platform. Prevent movement and shaking of the ship 14.

FIGS. 5 and 6 are diagrams showing other examples of the pedestal.
That is, in this example, the center of the upper surface of the base 3 is made to protrude, making the entire base 3 convex. 3a is the protrusion. Further, a bolt is used as the latching member 4, and the head thereof is embedded in the base 3 and installed. This base 3 is fixed to the ground 1 to constitute a pedestal B as in the above embodiment, and a steel pipe 1 is attached to the protrusion 3a.
The lower end of the steel pipe 15 is fitted onto the outside, the flange at the lower end of the steel pipe 15 is engaged with the latching fitting 4, and a nut 16 is screwed into the latching fitting 4 to support the steel pipe 15.

This situation is shown in FIG. That is, A is the pedestal shown in FIGS. 1 and 2, and B is the pedestal shown in FIGS. This is intended to prevent collisions with the structure 18. A cable rope 10 is strung diagonally on this pillar, and the lower end of the cable rope 10 is connected to a pedestal A to support the back tension of the cable rope 10 that occurs when the ship 19 collides with the pillar. There is. Thus, FIG. 7 shows an example in which both the pedestals A and B are used together.

FIG. 8 is a diagram showing yet another third pedestal, in which the pedestal 3 has a flat upper surface, and the latching fitting 4 implanted therein is as shown in FIG.
A latching fitting 4 made of a bolt is used. Then, the mechanical equipment 20 is placed on the top surface of the base 3, and
The mechanical equipment 20 is screwed onto the latch 4 with the nut 16.
is fixed to and supported by the base 3.

FIG. 9 shows yet another fourth pedestal, in which the diameter of the upper part of the vertical hole 9 of the pedestal 3 is enlarged, and a nut 12 (second and third ) is placed so as to prevent the nut from being exposed on the top surface of the base 3, thereby preventing the mechanical equipment 20 placed on the top surface of the base 3.
The load is evenly applied to the upper surface of the base 3 and is prevented from interfering with work, etc.

FIG. 10 shows yet another fifth pedestal. When excavating the excavated portion 5, the area where the vertical hole 7 is to be excavated is redundantly excavated to form an excavated recess 5a, and concrete 6a is also poured here. This is an example of setting the location. According to this example, there is an effect that the overload applied to the cast-in-place concrete 6 can be dispersed as much as possible and transmitted and supported to the ground 1.

In addition, although each of the above-mentioned pedestals is applied to the ground at the bottom of the water as the ground 1, it goes without saying that the ground 1 is not limited to the bottom of the water but may be ground on land. In this case, it goes without saying that it can be widely used as a pedestal for fixing ropes used in various construction works such as suspension bridge cables to the ground surface.

〔Effect of the invention〕

As is clear from the above, according to this invention,
Since the pedestal can be constructed relatively easily without using large-scale mechanical equipment, construction costs can be reduced. In addition, since cast-in-place concrete is placed on the underside of the base, it is possible to create a foundation that corresponds to the location where the pedestal is installed, and the base placed on top of the base is made of precast concrete. This makes the construction work easier.

Furthermore, since the bottom surface of the base and the top surface of cast-in-place concrete are flat, when securing the base using anchor materials or using the base after completion, the base will not be affected by excessive weight or traction force. Since the stress generated between the base and the concrete due to the applied force is dispersed over the entire joint surface between the two, there is no risk of damage to the base.

Furthermore, since the base is fixed to the ground via the anchor material and the hardening material, it is reliably fixed to the ground and can sufficiently withstand various uses of the base.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of the pedestal of the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Fig. 3 is a sectional view showing the construction procedure of the pedestal shown in Figs. 1 and 2. Yes, the same a shows the state of excavation of the ground, the same b shows the state of cast-in-place concrete, and the same c
3 shows a state in which a vertical hole is excavated, d in the same figure shows a state in which the vertical hole is filled with a hardening material and an anchor material is inserted, and e in the same figure shows a state in which a base is installed. Figure 4 is an explanatory diagram showing how the pedestals in Figures 1 and 2 are used;
FIG. 6 is a front view showing an example of the pedestal, FIG. 6 is a plan view of FIG. Figure 8 shows the third
FIG. 9 is a front view showing an example of a fourth pedestal, and FIG. 10 is a sectional view showing an example of a fifth pedestal. A...Pedestal, 1...Ground, 2...Anchor material, 3
...Base, 3a...Protrusion, 4...Latching fitting, 5...
... Excavation part, 6 ... Cast-in-place concrete, 7
... vertical hole, 8 ... hardened material, 9 ... vertical hole, 10 ...
Rope.

Claims (1)

[Claims] 1. Cast-in-place concrete is placed in the excavated portion formed by excavating the ground surface to flatten the ground surface, and a vertical hole is formed that is continuous with this concrete and the ground below. , the vertical hole is filled with a hardening material such as cement mortar, and an anchor material is inserted to fix the anchor material to the ground. Next, the vertical hole is formed with a flat bottom surface and corresponds to the anchor material, and is directed upward. A base made of precast concrete with a hook installed is placed on the cast-in-place concrete with the top of the anchor material corresponding to the vertical hole of the base, and then the top of the anchor material and the base are placed in correspondence with each other. A method for constructing a pedestal on the ground surface, characterized by fixing the pedestal. 2. The method for constructing a pedestal on the ground surface according to claim 1, wherein the vertical hole in the ground is filled with a hardening material and then an anchor material is inserted.