JP2544943B2 - Tube for mortar injection in prepacked concrete construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mortar injecting pipe in a prepacked concrete construction method, and particularly to a prepack suitable for use when a structure to be built is large-scale. The present invention relates to a pipe for mortar injection in the de concrete method.

“Conventional technology” Conventionally, as a method of constructing a concrete structure such as an offshore platform that is fixedly installed on the sea for the purpose of excavating an offshore oilfield, etc., inside a steel shell that has a role as a reinforcing member instead of a formwork and a reinforcing bar. There is known a method for constructing this concrete structure by using a member called a composite member, which is constructed by pouring concrete as a structural filler. A composite member is a member that makes use of each material characteristic such as good followability to deformation of steel shell and strength of compressive proof strength of concrete. Due to the characteristics such as watertightness and strength of fracture resistance against external force, and the advantage that extra work such as arranging the reinforcing bars and demolding the formwork is unnecessary, it is the optimum member to be used for the offshore platform. It can be said that there is.

In manufacturing such a composite member,
A prepacked concrete method is mentioned as a suitable method of placing concrete in a steel shell.

The pre-packed concrete method is a mortar injection outer pipe having a large number of through-holes formed on its side surface, and the aggregate is placed in the steel shell after the tip opening is arranged in advance so that it reaches the inner bottom of the steel shell. Filling, further inserting a mortar injection pipe into the mortar injection outer pipe, and by pouring and filling mortar from the inner bottom of the steel shell by this mortar injection pipe, a method of placing concrete in the steel shell . At this time, in order to detect the injection height of the mortar that has been cast into the steel shell, a perforated detection tube having the same structure as the mortar injection tube is previously arranged in the steel shell, and during mortar injection A level detector or the like is inserted into the detector tube to detect the injection height of the mortar.

[Problems to be Solved by the Invention] By the way, the offshore platform to which the composite member is applied is an extremely large-scale concrete structure, and the height of the steel shell thereof may reach up to 50 m or more. Therefore, the steel shell of such an offshore platform is manufactured by being divided into blocks in a yard or the like on land, and these blocks are integrated in a dock.

On the other hand, the mortar injecting outer tube and the detecting tube are required to be fixed in advance in the steel shell because the aggregate is charged and filled after they are arranged in the steel shell. Since the height of the shell is very high and the width of the steel shell is very narrow (usually about several tens of centimeters), it is difficult to arrange the mortar injection outer pipe, etc. inside the entire steel shell after assembling it. Have difficulty. Therefore, the mortar injection outer pipe and the like are divided into divided pipes for each of the steel shell blocks and attached inside the divided pipes in advance, and these divided pipes are connected to each other at the time of block assembly to be integrated. However, a means for connecting such a split pipe with high construction accuracy and efficiently has not been proposed yet.

The present invention has been made in view of the above problems, and is a mortar injecting pipe body, that is, a mortar injecting outer pipe, which is arranged in a form (steel shell) and configured by connecting a plurality of divided pipes. In the detection pipe, how to realize a pipe body for mortar injection in the prepacked concrete construction method that can connect these divided pipes with good construction accuracy and efficiency is a problem.

"Means for Solving the Problems" Therefore, the present invention is to embed a mortar injection pipe in an aggregate that is pre-filled in a mold, and use this mortar injection outer pipe to put the mortar in the mold. A plurality of mortar injection pipes used in the pre-packed concrete construction method in which concrete is poured into this form by pouring and filling. And a base end portion of the connecting member is externally fitted to one end of the division pipe, and a distal end portion thereof is gradually expanded in diameter toward the outside, and is formed into a pouch shape, The problem is solved.

Here, it is preferable that the mold is divided into a plurality of mold divided bodies and the divided pipe is formed in a length corresponding to the mold divided bodies.

[Operation] In the present invention, the base end of the connecting member for connecting the split pipes is externally fitted to one end of the split pipes, and the tip end thereof is formed in a tapered shape whose diameter is gradually increased toward the outside. When the split pipes are connected, even if the axes of the split pipes to be connected are slightly deviated from each other, the tip end of the connecting member guides the other end of the split pipe to which the connecting member is not fitted to the base end of the connecting member. [Examples] Examples of the present invention will be described below with reference to the drawings.

1 to 4 are views showing a mortar injection outer pipe (a mortar injection pipe) in a prepacked concrete construction method which is an embodiment of the present invention. It is applied to offshore platforms as shown in Figures 5-6.

First, the offshore platform to which the present embodiment is applied will be described. In FIGS. 5 to 6, the symbol P indicates an offshore platform placed on the seabed 1, and the offshore platform P is various equipments. It is composed of a deck portion A to which is attached and a lower structure portion B which supports the tack portion A. The lower structure part B is an inclined wall part 2 made of a composite member that is in direct contact with seawater.
, A vertical wall part 3 made of a composite member for maintaining the rigidity of the entire marine platform P, and a bottom plate 4 for transmitting a force applied to the vertical wall parts 3, 3 ,. The bottom slab 4 is provided with a lower surface, and is composed of an annular skirt 5 made of a composite member for fixing the position of the marine platform P on the seabed 1. The vertical wall portions 3, 3, ... Are arranged not only in the circumferential direction of the marine platform P but also in the radial direction in the lower structure portion B, as shown in FIG. In this state, the vertical walls 3, 3, ... As a result, the lower structure portion B has a structure having rigidity as a whole.

The inclined wall portion 2, the vertical wall portion 3 and the skirt 5 are formed of a composite member as described above, that is, the steel shell (form) 6 is filled with concrete 7 and cast. A rib (not shown) is provided in the steel shell 6 so as to project therein, and the rib secures the integrity of the steel shell 6 and the concrete 7. As shown in FIGS. 1 to 4, the mortar injection outer pipes 10, 10 of the embodiment of the present invention are provided on the vertical wall portions 3, 3, ... , (Only one is shown in the figure) are provided.

The mortar injection outer pipe 10 is inserted from an injection port 2a formed in the steel shell 6 of the inclined wall portion 2 corresponding to the upper side of the vertical wall portion 3, and the tip thereof is at the bottom of the steel shell 6 of the vertical wall portion 3. Has been extended to. The mortar injection outer pipe 10 is formed to have the same diameter, and the divided pipes 11, 11, ... With a large number of through holes 11a, 11a, ... A plurality of them are connected in the direction.

The connecting member 12 is attached by welding or the like to one end of the divided pipe 11 located above in the state where the divided pipes 11 are continuously provided. The connecting member 12 is formed on a cylindrical base end portion 12a which is fitted on the outer peripheral surface of one end portion of the split pipe 11 and on the upper end of the base end portion 12a, and gradually increases outward (in this case, upward). And a cylindrical tip portion 12b whose diameter is expanded. On the peripheral wall of the connecting member tip portion 12b, the divided pipe 1
As in the case of 1, a large number of through holes 12c, 12c, ... Are bored.
The base end portion 12a of the connecting member 12 is not entirely fitted onto one end portion (that is, the upper end portion) of the split pipe 11, and the lower end portion of the split pipe 11 located above is in the remaining portion. .. are inserted, so that a plurality of split tubes 11, 11, ... Are connected in the longitudinal direction via the connecting member 12.

Each of the divided pipes 11 is attached to the inner surface of the steel shell 6 by the connection member 12 attached thereto being supported on the inner surface of the steel shell 6 via the support member 13. This support member 13 is provided on the inner surface of the steel shell 6 by welding or the like, a base plate 13a, a bracket 13b protruding from the upper surface of the base plate 13a, and a bracket 13b provided at the tip end of the base member 13a. It is composed of a tubular mounting tube 13c into which the end 12a is fitted.

The steel shell 6 of the vertical wall portion 2 is formed by welding a plurality of steel shell blocks (form frame divided bodies) 6a, 6a, ... Therefore, when assembling the steel shell blocks 6a, 6a, ...
In order to facilitate the assembling work, it is preferable that the lengths and mounting positions of the split pipes 6a, ... As an example, the length of the split pipe 11 is formed to be substantially the same as the height of the steel shell block 6a, and the support member 13 is provided so that the connecting member tip portion 12b projects slightly upward from the upper end of the steel shell block 6a. A method of attaching to the upper portion of the steel shell block 6a can be mentioned. Or a split tube
11 The lower end may be attached so that it projects slightly downward from the lower end of the steel shell block 6a, and further, the length of the split pipe 11 is formed to the height of the plurality of steel shell blocks 6a, and the support is provided. The number of members 13, that is, the supporting position of the split pipe 11, may be reduced.

Next, a method of constructing the marine platform P having the above configuration will be described.

First, in a land yard or the like, steel shell blocks 6a, 6a, etc., which constitute the lower structural portion B such as the inclined wall portion 2 and the vertical wall portion 3, ...
To produce each. At this time, the split pipe 11 to which the connecting member 12 is attached is attached to the inner surface of the steel shell block 6a forming the vertical wall portion 3 via the support member 13.

Next, the steel shells 6 of the lower structural part B are assembled by joining and integrating the steel shell blocks 6a, ... By welding or the like in a dock that is in contact with the seaside or the riverside. Here, when joining the steel shell blocks 6a, ... Of the vertical wall portion 3,
At the same time, the split pipes 11 are connected to each other, but even if the axial lines of the split pipes 11, 11 that are vertically connected are slightly deviated from each other, the split pipe 11 located at the lower end has a connecting member tip portion 12 provided at the upper end thereof.
b is the upper end of the split pipe 11 and the bottom end of the connecting member 1
Since it is guided to 2a, the division pipes 11, ... Are connected accurately and easily. In this way, at the same time when the steel shell 6 of the vertical wall portion 3 is completed, the mortar injection outer pipe 10 is built therein.

Further, when the steel shell 6 of the lower structural part B is completed, a large number of aggregate loading ports are bored at required portions on the upper surface of the inclined wall portion 2, and the aggregate is loaded and filled into the steel shell 6 through these loading ports. To do. Then, the mortar injection pipe 14 (see FIG. 2) is sequentially inserted into the mortar injection outer pipe 10 from the place where the filling of the aggregate is completed, and the mortar injection pipe 14 is installed in the vicinity of the lower structure part B through the mortar injection pipe 14. Mortar injection outer pipe from an abandoned concrete plant
Mortar is pumped into 10. The mortar that has been sent under pressure has through holes 11a, 11a, ... Formed in the peripheral wall of the mortar injection outer tube 10.
It is leached into the inside of the steel shell 6 through and is injected and filled into the steel shell 6. In this way, after the concrete 7 is placed by filling the entire interior of the steel shell 6 with mortar, the deck portion A is assembled on the lower structure portion B, whereby the construction of the marine platform is completed. The entire mortar injection work does not have to be performed in the dock, and a part of the work may be performed while the ship is being towed by a tow ship or the like.

Therefore, the mortar injection outer pipe 10 of this embodiment is a divided pipe.
Since the distal end portion of 11 is provided with a connecting member tip portion 12b having a trapezoidal shape, even if the axial lines of the split pipes 11, 11 to be joined are slightly deviated when the split pipes 11, 11 are joined, the connecting member tip portion is Since the lower end portion 12b guides the lower end portion of the divided pipe 11 located above to the connecting member base end portion 12a, the divided pipes 11, ... Can be accurately and easily connected. Therefore, according to this embodiment,
In the mortar injection outer pipe 10 configured by connecting a plurality of divided pipes 11, 11, ..., To realize the mortar injection outer pipe 10 capable of connecting these divided pipes 11, ... With good construction accuracy and efficiency. You can

The mortar injection pipe of the present invention is not limited to the mortar injection outer pipe, but may be applied to the above-mentioned detection pipe for detecting the mortar injection height.
The structure to which the mortar injecting pipe of the present invention is applied is not limited to the marine platform, and any structure to which the prepacked concrete method is applied is suitably used.

"Effects of the Invention" As described in detail above, according to the present invention, a plurality of mortar injecting pipes used in the prepacked concrete construction method are connected in the longitudinal direction via a substantially cylindrical connecting member. Since it is composed of split pipes of the same diameter, and the base end of the connecting member is externally fitted to one end of the split pipe, and the tip end thereof is formed in a tapered shape in which the diameter is gradually increased toward the outside. When the split pipes are connected, even if the axes of the split pipes to be connected are slightly deviated from each other, the tip end of the connecting member guides the other end of the split pipe to which the connecting member is not fitted to the base end of the connecting member. Therefore, division pipe connection is performed accurately and easily. Therefore, according to the present invention, in a mortar injecting pipe body configured by connecting a plurality of divided pipes, it is possible to realize a mortar injecting pipe body in which these divided pipes can be connected with good construction accuracy and efficiency. You can

[Brief description of drawings]

1 and 2 are views showing a mortar injecting outer tube which is an embodiment of the present invention, wherein FIG. 1 is a sectional view showing a state of being built in a steel shell, and FIG. FIG. 1 is an enlarged cross-sectional view of the II circle in FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III ′ in FIG. 2, and FIG. 4 is a line IV-IV ′ in FIG. FIG. 5 to FIG. 6 are sectional views taken along the line, showing the marine platform to which the mortar injection outer tube is applied,
FIG. 5 is a sectional view and FIG. 6 is a plan view. 6 …… Steel shell (form), 6a …… Steel shell block (form divided body), 10 …… Mortar injection outer pipe (mortar injection pipe), 11 …… Division pipe, 12 …… Coupling member, 12a …… base end, 12b …… tip end.

Claims (2)

(57) [Claims] 1. A mortar injecting tube is embedded in an aggregate that is pre-filled in the form, and this mortar injecting tube is used to inject and fill the mortar into the form. A tube for mortar injection used in a prepacked concrete construction method in which concrete is poured into the tube, and this tube for mortar injection has a divided pipe of the same diameter in the longitudinal direction through a substantially tubular connecting member. It is configured by connecting multiple pieces, and
The pre-packed connecting member is formed such that a base end portion of the connecting member is externally fitted to one end of the split pipe, and a tip end portion of the connecting member is gradually expanded in diameter toward the outside. Tube for mortar injection in concrete method. 2. The mold is divided into a plurality of mold divided bodies, and the dividing pipe is formed to have a length corresponding to the mold divided bodies. A tube for mortar injection in the prepacked concrete construction method according to claim 1.