JP5508917B2 - Self-supporting temporary closing structure and self-supporting temporary closing method - Google Patents

Description

  The present invention belongs to the technical field of temporary closing structure and temporary closing method suitable for reinforcement work and repair work of existing underwater bridge piers. The present invention relates to a self-supporting temporary closing structure and a self-supporting temporary closing method that are completely useless.

When reinforcing and repairing existing underwater bridge piers, the temporary closing method (temporary closing structure) in which existing steel sheet piles are built may not be adopted due to the fact that bridge girders already exist.
Conventionally, as a temporary closing method applicable to such a case, an invention using a cylindrical temporary body formed by connecting a plurality of liner plates and the like in the circumferential direction and the height direction has been disclosed (for example, patents) References 1-4). Also disclosed is an invention in which steel shells divided into a plurality are connected to each other in the circumferential direction on the foundation of an underwater bridge pier to form a cylindrical temporary body (see, for example, Patent Document 5).

In FIG. 1 of Patent Document 1, on the foundation 2 of an existing underwater bridge pier 1 , a first tubular temporary body (waterstop tank body) 11 surrounding the underwater bridge pier 1 and the inside of the first tubular temporary body 11 A cylinder comprising a second cylindrical temporary body (inner ring) 12 that is lower than the cylindrical temporary body 11 and a connecting member 13 that connects the first and second cylindrical temporary bodies 11 and 12. A structure (water-stopping tank) 10 is installed, and water-stopping concrete (underwater concrete) 15 is placed between the first and second tubular temporary bodies 11 and 12. Further, in order to prevent deformation (falling down) of the first tubular temporary body 11 due to water pressure, there are three places in the height direction between the existing underwater bridge pier 1 and the first tubular temporary body 11. A total of twelve cut beams 18 are stretched in four directions.
According to the invention according to Patent Document 1, a tubular temporary structure can be formed without hindering the bridge girder, so that a temporary effect can be recognized as an alternative to the existing temporary closing method using steel sheet piles.

The inventions according to Patent Documents 2 to 4 also disclose a temporary closing method (temporary closing structure) using a cylindrical temporary structure similar to that of Patent Document 1, and an alternative to the existing temporary closing method using steel sheet piles. A temporary effect is recognized.
The invention according to Patent Document 5 discloses a temporary closing method for forming a cylindrical temporary body on the foundation of an underwater bridge pier, and a temporary effect is recognized as an alternative to the existing temporary closing method using steel sheet piles.

Japanese Patent Laid-Open No. 11-131488 Japanese Patent Laid-Open No. 9-158192 JP-A-9-221760 Japanese Patent Laid-Open No. 10-54037 Japanese Patent Application Laid-Open No. 11-256587

However, according to the temporary closing structure according to Patent Document 1 described above, since there are a large number of cut beams 18 on four sides of an existing underwater bridge pier that is an object of reinforcement work and repair work, the number of members increases and the cost increases. In addition, a large number of beams 18 obstructed the construction, forcing unreasonable construction, making construction difficult. For example, when a temporary closing structure is constructed to reinforce a bridge pier and concrete is wound around the pier, the concrete placement work must be divided because of the cut beam 18. However, in that case, it was necessary to repeat the work of shifting the cut beam 18 existing at the reinforcement target portion left and right or up and down a plurality of times. This problem is pointed out in paragraph [0022] of Patent Document 5 above.
As described above, according to the temporary closing structure according to Patent Document 1, there are problems that the work efficiency is remarkably lowered due to the presence of a large number of cut beams 18 and the construction period is prolonged.

Although the inventions according to the above-mentioned Patent Documents 2 to 4 are not shown in the drawings, when these temporary closing structures are actually implemented in the field, the cutting beam is indispensable, and deformation of the cylindrical temporary structure due to water pressure ( In order to prevent (falling), it is the actual situation that a large number of beams 18 are stretched on the four sides of the existing underwater bridge pier, which is the object of reinforcement work and repair work. Therefore, there was a problem similar to that of Patent Document 1.
Although it is recognized that the invention according to Patent Document 5 does not require the work of rearranging the cut beam (see the eighth line of paragraph [0058]), there is no change in using the cut beam, and the number of members is large. The problem of increasing costs has not been solved. Rather, each cut beam has an expansion joint (14a) for adjusting the length by an adjuster double jack or the like, and a roller (14b) is attached to the tip as a sliding member for improving sliding with the pier (1). Since the configuration is implemented (see paragraph [0042]), there is a problem that the cost is further increased.
In addition, although it is recognized that the work of rearranging the cut beam is unnecessary, the substance is implemented by providing the cut beam at a position higher than the height of the steel plate (2) wound around the underwater pier (1). However, there is a problem that it is necessary to set the steel shell having a high unit unit cost higher than necessary (waste), which is unreasonable and very expensive.

  The purpose of the present invention is to make the tubular temporary body self-supporting by a support material that rises along the inner wall surface of the tubular temporary body so that no cutting beams are required, and the existing underwater bridge pier reinforcement work and repair work can be carried out reasonably quickly. Another object of the present invention is to provide a self-supporting temporary fastening structure and a self-supporting temporary fastening method that can be reliably executed and are excellent in workability and economy.

As a means for solving the above-mentioned background art, the self-supporting temporary closing structure according to the invention described in claim 1 is provided with a cylindrical temporary structure so as to surround an existing underwater bridge pier, and the inside of the cylindrical temporary structure. It is a self-supporting temporary closing structure that forms a work space by draining water,
The tubular temporary body is provided on the upper surface of the foundation of the underwater pier,
Inside of the tubular temporary body, it is rigidly connected with the struts that rising above the water level along the inner wall surface of the cylindrical temporary body, the L-shape in the horizontal provided at a lower end of said supporting pillar member A plurality of supporting materials are installed in a configuration in which water pressure acting on the cylindrical temporary body is transmitted;
The partition member to prevent leakage of the waterproofing concrete arrangement which faces the inner wall surface of the lower end portion of the tubular temporary member is provided in a ring shape,
Each of the plurality of support members is installed by being bolted to the upper surface of the foundation of the underwater bridge pier by arranging the horizontal member in a direction perpendicular to the tubular temporary body, and a bottom end portion of the tubular temporary body , The L-shaped corner formed by the support material of the support material and the horizontal material is formed by water-stopping concrete in a groove formed by the partition material and the upper surface of the foundation of the underwater bridge pier, and the water-stopping concrete It is embedded inside .

The self-supporting temporary cutoff structure according to the invention described in claim 2 is a self-supporting type in which a cylindrical temporary body is provided so as to surround an existing underwater bridge pier, and a working space is formed by draining water inside the cylindrical temporary body. A temporary deadline structure,
An overhanging plate is provided on the upper surface of the outer peripheral portion of the foundation of the underwater pier so as to project horizontally outward.
The tubular temporary body is provided on the upper surface of the overhang plate in the outer part of the foundation of the underwater bridge pier;
A support material which is rigidly connected in an L shape with a column material standing above the water level along the inner wall surface of the cylindrical temporary structure and a horizontal material provided at the lower end of the column material inside the cylindrical temporary structure. However, a plurality of water pressures that are applied to the tubular temporary body are transmitted.
A partition material for preventing leakage of water-stopping concrete is provided in a ring shape in an arrangement facing the inner wall surface of the lower end portion of the cylindrical temporary body,
Each of the plurality of support members is installed by being bolted to the upper surface of the foundation of the underwater bridge pier by arranging the horizontal member in a direction perpendicular to the tubular temporary body, and a bottom end portion of the tubular temporary body, The L-shaped corner formed by the support material of the support material and the horizontal material is placed in the groove formed by the partition material and the upper surface of the projecting plate, and the L-shaped corner portion is formed in the water-resistant concrete. It is embedded .

According to a third aspect of the present invention, in the self-supporting temporary closing structure according to the first or second aspect , the cylindrical temporary structure includes a plurality of liner plates, corrugated sheets, steel segments, or PC segments in the circumferential direction. And connected to each other in the height direction .

The self-supporting temporary closing method according to the invention described in claim 4 is a self-supporting method in which a cylindrical temporary structure is provided so as to surround an existing underwater bridge pier, and a working space is formed by draining the inside of the cylindrical temporary structure. A temporary closing method,
The tubular temporary body is provided on the upper surface of the foundation of the underwater bridge pier, and is provided on the inner side of the tubular temporary body, on a support column that rises above the water level along the inner wall surface of the cylindrical temporary structure, and on the lower end of the support column. Installing a plurality of supporting members rigidly joined in an L shape with the horizontal member formed in a configuration in which water pressure acting on the cylindrical temporary structure is transmitted;
Providing a partition material that prevents leakage of water-stopping concrete in an arrangement facing the inner wall surface of the lower end portion of the tubular temporary body, in a ring shape;
Each of the plurality of support members is disposed by placing the horizontal member in a direction perpendicular to the tubular temporary body and bolted to the upper surface of the foundation of the underwater bridge pier, and a lower end portion of the tubular temporary body, The L-shaped corner portion formed by the support material and the horizontal material is placed in the groove portion formed by the partition material and the upper surface of the foundation of the submerged bridge pier, and the L-shaped corner portion is formed by the water-resistant concrete. It is embedded therein, and the water inside the cylindrical temporary structure is drained after the water-stopping concrete is hardened.

The self-supporting temporary closing method according to the invention described in claim 5 is a self-supporting method in which a cylindrical temporary structure is provided so as to surround an existing underwater bridge pier, and a working space is formed by draining the inside of the cylindrical temporary structure. A temporary closing method,
An overhang plate that projects horizontally outward is provided on the upper surface of the outer periphery of the foundation of the underwater pier, and the tubular temporary body is provided on the upper surface of the overhang plate in the outer portion of the foundation of the underwater pier. A support material that is rigidly joined in an L shape with a support material that rises above the water level along the inner wall surface of the cylindrical temporary structure and a horizontal material that is provided at the lower end of the support material. Installing a plurality of water pressures acting on the cylindrical temporary body in a configuration to transmit,
Providing a partition material that prevents leakage of water-stopping concrete in an arrangement facing the inner wall surface of the lower end portion of the tubular temporary body, in a ring shape;
Each of the plurality of support members is disposed by placing the horizontal member in a direction perpendicular to the tubular temporary body and bolted to the upper surface of the foundation of the underwater bridge pier, and a lower end portion of the tubular temporary body, The L-shaped corner formed by the support material and the horizontal material is placed in the groove formed by the partition material and the upper surface of the projecting plate, and the L-shaped corner portion is formed in the water-resistant concrete. A self-supporting temporary closing method characterized in that water is drained from the inside of the tubular temporary body after being embedded and the water-stopping concrete is hardened.

According to the self-supporting temporary fastening structure and the self-supporting temporary fastening method according to claims 1 to 5 , the following effects can be obtained.
Since the cylindrical temporary structure can be made self-supporting by fixing the support material with the top end to the water level or higher and the still water concrete to the foundation, the conventionally required beam is unnecessary. Therefore, there is nothing that restricts the construction around the underwater pier, which is the construction target, and the construction can be carried out quickly and reliably, so the work efficiency can be dramatically improved and the construction period can be shortened. Can be planned. Therefore, it is very excellent in workability and economy.
Moreover, the construction work of the cylindrical temporary body performed by barge or the like, since the installation work of the pre-supports and the partition member performed in water may be performed in parallel, Ru can make rational work.

A is an elevation view schematically showing a self-supporting temporary closing structure according to the present invention, and B is a plan sectional view of the same. A is an elevation view showing a pivotal part of the self-supporting temporary closing structure according to the first embodiment, and B is a plan view of the same. A is an elevation view showing a pivotal part of the self-standing temporary closing structure according to Reference Example 1 , and B is a plan view of the same. A is an elevation view showing a pivotal part of a self-supporting temporary closing structure according to Reference Example 2 , and B is a plan view of the same. A is an elevation view showing a pivotal part of a self-supporting temporary closing structure according to Reference Example 3 , and B is a plan view of the same. A is an elevation view showing a pivotal part of a self-supporting temporary closing structure according to Reference Example 4 , and B is a plan view of the same. 10 is an elevational view showing a pivotal part of a self-supporting temporary closing structure according to Reference Example 5. FIG. 10 is an elevation view showing a variation of the self-supporting temporary closing structure according to Reference Example 5. FIG. A is the elevation which showed the principal part of the self-supporting type temporary closing structure which concerns on Example 2 , B is the same top view. It is the plane sectional view showing the variation of the self-standing temporary closing structure concerning Example 1 of the present invention.

  In the self-supporting temporary fastening structure and the self-supporting temporary fastening method according to the present invention, the tubular temporary body is deformed by water pressure without using a cutting beam by making the cylindrical temporary body self-supporting using a support material having high rigidity ( It is based on the technical idea that prevents falling down.

FIG. 1 schematically shows an overall view of a self-supporting temporary closing structure according to the present invention. FIG. 2 is a partially enlarged view of FIG.
In the self-supporting temporary closing structure according to the illustrated example, a cylindrical temporary body 1 is provided so as to surround an existing underwater bridge pier 10, and the working space 12 is formed by draining water inside the cylindrical temporary structure 1. The tubular temporary structure 1 is provided on the upper surface of the foundation 11 of the underwater pier 10 so as to surround the underwater pier 10.
A plurality (four in a balanced manner in the illustrated example) are arranged along the inner circumferential direction of the cylindrical temporary body 1 and rise along the inner wall surface of the cylindrical temporary body 1 to prevent deformation of the cylindrical temporary body 1. The material 2 is installed inside the working space 12 with (anchor) bolts 5.
Each supporting material 2 is provided with a column material 21 rising along the inner wall surface of the cylindrical temporary body 1, a horizontal material 22 provided horizontally at the lower end of the column material 21, and obliquely below the column material 21. It is comprised with the diagonal material 23, and the top end of the said support | pillar material 21 is made into the height more than a water level (H).
A partition member 3 is provided in a ring shape so as to face the inner wall surface of the lower end portion of the cylindrical temporary body 1.
Water- stopping concrete 4 is placed in a groove formed by the lower end portion of the tubular temporary body 1, the partition material 3, and the upper surface of the foundation 11 of the underwater bridge pier 10, and the support material 2 and the horizontal material 22. The L-shaped corner portion formed by and is embedded in the water-stopping concrete 4 .

Although the concrete structure of the said cylindrical temporary body 1 is demonstrated by the self-supporting temporary closing method mentioned later, the cylindrical temporary body 1 which concerns on the example of illustration connects several liner plates mutually in the circumferential direction and a height direction. Therefore, it is carried out by forming it into a circular shape corresponding to the flat cross-sectional shape of the existing underwater bridge pier 10 which is the object of reinforcement work and repair work. Incidentally, the tubular temporary body 1 according to the illustrated example has a diameter of about 6500 mm and a height of about 1500 mm, and is provided with a reinforcing ring 19 in the vertical direction and placed on the outer periphery of the foundation 11 of the underwater pier 10. Has been.
In addition, since the cross-sectional shape of the said cylindrical temporary body 1 does not use a cut beam, it can be implemented not only in a circular cross-sectional shape but also in an oval shape (see FIG. 10), a rectangular shape, etc. The size and shape of the tubular temporary body 1 are appropriately changed in design according to the form of the underwater pier 10 as a construction object, the water level (H), and the work space 12 necessary for the construction (see FIG. 10).

A total of four support members 2 that support the tubular temporary body 1 are provided in a well-balanced manner on four sides of the existing underwater bridge pier 10.
As shown in FIG. 2, each support material 2 includes a column material 21 that rises along the inner wall surface of the cylindrical temporary body 1, a horizontal material 22 that is provided horizontally at the lower end of the column material 21, and a column material. 21 and a diagonal member 23 provided obliquely downward from 21. The contact portions of the respective members are joined together by welding (or bolts) to be integrally rigidly connected.
Each support member 2 having the above-described configuration is arranged on the plate 6 in which the horizontal member 22 is arranged in a direction perpendicular to the cylindrical temporary body 1 and fixed to two lower surfaces of the horizontal member 22 constituting the support member 2 in the illustrated example. By driving a plurality of anchor bolts 5, they are detachably installed on the outer periphery of the foundation 11 of the underwater pier 10.

Of course, the number of supporting members 2 according to the illustrated example is not limited to four, and can be appropriately increased or decreased according to the size of the cylindrical temporary body 1 to be applied, the water pressure acting on the cylindrical temporary body 1, and the like. The support material 21, the horizontal material 22, and the diagonal material 23 constituting the support material 2 are all H-shaped steel, but are not limited to this, steel materials such as I-shaped steel and steel pipe, or a combination thereof. But it can be done in the same way. The support material 2 is composed of a support material 21, a horizontal material 22, and a diagonal material 23, and is composed of a support material 21 and a horizontal material 22 on the condition that the cylindrical temporary structure 1 can be made independent in a stable state. An L-shaped support material or a support material composed of the support material 21 and the diagonal material 23 can also be implemented.
The size of the pre-supports 2, high Satoshi, a size suitable to cause free-standing the struts 21 in a stable state crest of the strut member 21 fixed on the foundation 11 in JP becomes water level (H) or The horizontal member 22 and / or the diagonal member 23 are used. By the way, the height of the support material 21 according to the illustrated example is about 1500 mm, which is equivalent to the cylindrical temporary body 1, and the length of the horizontal material 22 is about 1000mm. As an example, the cross-sectional dimensions of the H-section steel used for the support member 21, the horizontal member 22, and the diagonal member 23 constituting the support member 2 are 125 × 125 × 6.9 × 9 (mm). Furthermore, although the foundation 11 of the underwater pier 10 on which the support material 2 according to the present embodiment is installed is implemented by the existing foundation 11, it can be similarly implemented by the foundation of a new construction (including an extension).

  With respect to the installation interval between the tubular temporary body 1 and the support member 2, the flange of the reinforcing ring 19 disposed on the tubular temporary body 10 is surely transmitted to the support member 2 so that the water pressure acting on the tubular temporary body 1 is transmitted. It is carried out at an interval at which the surface and the flange surface of the support material 21 constituting the support material 2 abut. In the case where the cylindrical temporary body 10 is formed without using the reinforcing ring 19, the circumferential flange of the liner plate constituting the cylindrical temporary body 10 is carried out at an interval at which it abuts against the flange surface of the column material 21. . In the final adjustment stage, when a gap is generated between the tubular temporary body 1 and the support material 2, a hydraulic pressure acting on the tubular temporary body 1 is applied by driving a wedge into the gap. A device to ensure transmission to the support material 2 is appropriately performed.

The partition material 3 uses a plate material 3 such as a steel plate curved with a required curvature, and is intermittently disposed between the adjacent support materials 2 to support the support material 2 (particularly the horizontal material 22) and the plate. Sealing means is applied to the joint portion with the material 3 to form a ring shape so that the waterproof concrete 4 to be placed later does not leak. Incidentally, the partition material (plate material) 3 according to the present embodiment has a height (about 200 mm in the illustrated example) necessary to form the water-stopping concrete 4 and is spaced from the cylindrical temporary body 1 by about 300 mm. The cylindrical temporary body 1 is provided in a ring shape that approximates the flat cross-sectional shape (circular in the illustrated example).
In addition, although the partition material 3 which concerns on a present Example is made to stand by forming in a ring shape, it is not this limitation, It provides with diagonal material (holding material) for every required space | interval, or it is a plate in a lower end. Various standing-up methods, such as forming an upside-down T-shape with a ridge and standing up, are employed.

A water-stopping concrete 4 is placed in a ring-shaped concave groove formed by the partition member 3, the tubular temporary body 1 and the foundation 11. When the water-stopping concrete 4 is placed, attachment of a sealing member such as a rubber belt that closes the gap with the base 11 at the lower end of the tubular temporary body 1 or padding with a sandbag is appropriately performed.
Thus, when the placed water-stopping concrete 4 is cured, water can be reliably stopped at the lower end portion of the tubular temporary body 1 and the support material 2 can be more firmly fixed to the foundation 11. .

The above self-supporting temporary closing structure is performed in the following procedure.
First, the construction work of the tubular temporary body 1 is performed by using a carriage.
When using a trolley, float the trolley close to the pier and use it as a scaffold for work. On this carriage, a plurality of arc-shaped liner plates (four in the illustrated example; the same applies hereinafter) liner plates are connected in the circumferential direction to construct an arc-shaped first-stage liner plate. Next, the first stage liner plate is lifted with a wire by a lifting machine attached to the bridge girder, and a plurality of arc-shaped liner plates are connected in the circumferential direction at the lower side in the same manner as described above. Build an eye liner plate. Next, the first-stage liner plate is lowered, the pitch of the second-stage liner plate is shifted, and the two are connected via the reinforcing ring 19. Next, the connected first-stage and second-stage liner plates are lifted with a wire by a lifting machine, and below the same, a plurality of arc-shaped liner plates are connected in the circumferential direction in the same manner as described above. Build a third stage liner plate. Next, the connected first-stage and second-stage liner plates are lowered, the third-stage liner plates are shifted in pitch, and both are connected via the reinforcing ring 19, thus forming a cylindrical temporary Body 1 is constructed.

In addition, although the size and shape of the cylindrical temporary body 1 to be constructed are structurally designed based on the form of the underwater bridge pier 10 as a construction object, the water level (H), and the work space 12 necessary for the construction, In the example, the cylindrical temporary structure 1 having a diameter of about 6500 mm and a height of about 1500 mm is constructed and implemented. The cylindrical temporary body 1 according to the illustrated example is constructed of the three-stage liner plate, but is not limited to this, and a liner plate of four or more stages can also be constructed following the above steps.
Moreover, in order to perform the construction work of the cylindrical temporary body 1 in a watertight manner, it is appropriately performed to provide a sealing means such as a packing at the connection portion of each liner plate.
Furthermore, although the cylindrical temporary body 1 which concerns on a present Example is constructed | assembled with the liner plate, it is not limited to this, It can implement similarly also with a corrugated sheet (a corrugated section is included), a steel segment, or a PC segment. .
The lifter that lifts the liner plate can be mounted on a bridge girder, mounted on a work boat, or on land cranes when close to the shore.

After completing the construction work of the tubular temporary body 1 on the trolley, the underwater work described below is started.
That is, the trolley is moved away from the underwater pier 10, and the tubular temporary body 1 constructed by the lifting machine is lowered and placed at a predetermined position on the foundation 11 of the underwater pier 10 (see FIG. 2).
Next, the support material 2 is disposed so that the flange surface of the support member 21 comes into contact with the flange surface of the reinforcing ring 19 protruding inward of the cylindrical temporary body 1 placed on the foundation 11. A plurality of support materials 2 according to the present embodiment are arranged in a balanced manner (four in the illustrated example) in a portion suitable for allowing the tubular temporary body 1 to stand on its own, and the flange surface of the support material 21 of each support material 2 is arranged. The horizontal member 22 is installed on the foundation 11 so as to be detachable with the anchor bolt 5 while being in contact with the flange surface of the reinforcing ring 19.
Next, the partition material (plate material) 3 is intermittently disposed between the adjacent support materials 2, and a sealing means is provided at a joint portion between the horizontal material 22 constituting the support material 2 and the partition material 3. To form a ring shape as a whole. Since the partition member 3 according to the illustrated example is curved with a required curvature, the partition member 3 can be self-supporting, but both ends of the partition member 3 may be welded or joined to the horizontal member 22 with a bolt or may be erected. As described above, diagonal materials can be provided at every required interval to stand up.

In addition, in the present Example, although the cylindrical temporary body 1, the support material 2, and the partition material 3 are provided and implemented on the existing foundation 11, the said foundation 11 may be newly installed or expanded. In short, when the underwater bridge pier 10 is constructed, if the tubular temporary body 1 necessary for securing the work space is structurally designed and the existing foundation is present at the part on which the tubular temporary body 1 is placed, If the foundation is used, or if there is no foundation, the foundation is newly installed or expanded, and the tubular temporary body 1, the support material 2, and the partition material 3 are provided on the foundation.
Further, the underwater work procedure according to the present embodiment is not limited to this, although the installation work of the support material 2 and the partition material 3 is performed after the cylindrical temporary body 1 is placed on the foundation 11. After the installation work of the material 2 and the partition material 3, the cylindrical temporary body 1 may be placed on the foundation 11. The same technical idea applies to the following embodiments.

Thus, after providing the cylindrical temporary body 1, the support material 2, and the partition material 3 on the foundation 11, a sealing member such as a rubber belt that closes the gap with the foundation 11 as necessary at the lower end of the cylindrical temporary structure 1. Attaching the padding and / or padding with sandbags is performed as appropriate. Next, water-stopping (underwater) concrete 4 is placed in a ring-shaped concave groove formed by the partition member 3, the tubular temporary body 1, and the foundation 11. When the water-stopping concrete 4 is placed, the foundation 11 and the water-stopping concrete 4 are fixed so that the tubular temporary structure 1 does not move due to buoyancy when the water inside the tubular temporary structure 1 is drained. An anchor (or reinforcing bar) 7 such as a deformed steel bar for driving is driven into the foundation 11.
After the water-stopping concrete 4 is cured, it is confirmed that the water is surely stopped at the lower end of the tubular temporary body 1, and the interior of the tubular temporary body 1 is drained to form the work space 12. .
Thus, after all the underwater work has been completed, the underwater bridge pier 10 is reinforced or repaired.

  After the underwater bridge pier 10 has been reinforced or repaired, the liner plate other than the lowest level of the tubular temporary body 1 can be easily removed by removing the bolt at the connection with the lowest level, and implemented at other locations. Can be diverted to the temporary closing method. The lowermost liner plate and the supporting material 2 are accompanied by a work of turning the water-stopping concrete 4 in water, but can also be removed. In particular, since the support material 2 is detachably installed on the foundation 11 with the anchor bolts 5, it can be easily removed after the water-stopping concrete 4 has been turned.

According to the above-described self-supporting temporary closing structure and the self-supporting temporary closing method, the tubular temporary structure 1 is self-supported by fixing the support material 2 having the top end to the water level (H) or higher and the still water concrete 4 to the foundation 11. Therefore, the beam that has been indispensable in the past becomes useless.
Therefore, there is nothing to restrict the construction around the underwater pier 10 that is the construction target, and the construction can be carried out quickly and reliably, so that the work efficiency can be dramatically improved and the construction period can be shortened. Can be achieved. Therefore, it is very excellent in workability and economy.
Moreover, since the construction work of the cylindrical temporary body 1 performed with a trolley etc. and the installation work of the support material 2 and the partition material 3 performed underwater can also be implemented in parallel, a rational work can be performed. it can.
[Reference Example 1]

Figure 3 shows a reference example 1 of the own Tatsushiki provisional deadline structural and self-supporting temporary deadline method. 3 is different from the first embodiment mainly in that the support member 2 is raised by interposing a base member 8 between the base 11 and the support member 2. To do. Since the structural members such as the cylindrical temporary body 1, the support material 2, and the partition material 3 are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.
Specifically, the base member 8 according to the illustrated example is formed by placing underwater concrete into a rectangular frame assembled at a predetermined site and forming it into a rectangular parallelepiped. The base member 8 is provided in a portion where a space for placing the water-stopping concrete 4 can be secured, as well as the support member 2 installed on the base member 8 in a stable size. Incidentally, the height dimension of the base member 8 according to the illustrated example is about 200 mm, which is equivalent to the partition member 3. In order to improve the fixing property between the base member (underwater concrete) 8 and the foundation 11, the upper surface of the foundation 11 is roughened, and an anchor 9 (or a reinforcing bar) such as a deformed steel bar is driven into the base 11 to form the base member. The idea of constructing 8 is appropriately performed.
The support material 2 is detachably installed on the upper surface of the base member 8 by driving a plurality of anchor bolts 5 into a plate 6 fixed at two positions on the lower surface of the horizontal material 22 constituting the support material 2.
As described above, various methods can be adopted as a method of standing and fixing the partition member 3.

In the self-supporting temporary closing method according to the first reference example , after the base member 8 is constructed at a predetermined part on the foundation 11, the tubular temporary structure 1 constructed on the trolley is lowered by a lifting machine, and the underwater pier is constructed. 10 at a predetermined position on the foundation 11. Thereafter, the support member 2 is installed on the base member 8 and the partition member 3 is arranged in a ring shape. Subsequent work for placing water-stopping concrete proceeds in the same way as in Example 1 above (see paragraph [00 28 ]). After all these underwater operations have been completed, the underwater bridge pier 10 is reinforced or repaired. Start.

According to the self-supporting temporary fastening structure and the self-supporting temporary fastening method according to the first reference example , the support material 2 is not limited to the effects of the first embodiment (see paragraph [00 30 ]). Since the base member 8 is installed on the upper surface of the water-stopping concrete 4 and the base member 8 is detachably installed on the base member 8 with the anchor bolt 5, the anchor bolt 5 is removed from the support member 2 in water. Compared with the above-mentioned Example 1, it is not necessary to work on the water-stopping concrete 4 and is very convenient. Even if compared with the prior art mentioned in the above-mentioned background art section, it can be removed with the same or less effort.

In this reference example 1, the base member (underwater concrete) 8 and the still water concrete 4 are separately placed. However, in order to rationalize the concrete placement work, it is placed once (simultaneously). It can also be implemented.
[Reference Example 2]

Figure 4 shows a reference example 2 of self Tatsushiki provisional deadline structural and self-supporting temporary deadline method. Compared with the first embodiment, the self-supporting temporary closing structure according to FIG. 4 is mainly that the support member 2 is raised by interposing a base member 8 ′ between the base 11 and the support member 2. Is different. In other words, this is an alternative to Reference Example 1 above. Since the structural members such as the cylindrical temporary body 1, the support material 2, and the partition material 3 are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.
The base member 8 ′ according to the illustrated example uses H-shaped steel, and is implemented in a size and arrangement that can support the support member 2 installed on the base member 8 ′ in a stable state. Specifically, two H-section steels 8 ′ having a length of about 500 mm are positioned corresponding to the central portion and the open end portion of the horizontal member 22 constituting the support member 2 installed on the H-section steel 8 ′. The flange portion and the foundation 11 are fixed with anchor bolts 15 with the web portion set in the vertical direction. On the upper surface of the base member 8 ′ fixed on the foundation 11, a horizontal member 22 constituting the support member 2 is installed, and the flange portion of the base member 8 ′ and the plate 6 provided on the horizontal member 22 are connected with bolts 16. It is detachably joined. Incidentally, the base member (H-section steel) 8 ′ according to the illustrated example has a height dimension of about 200 mm, which is equivalent to the partition member 3. Moreover, if base member 8 'forms the structure which can mount support material 2 other than H shape steel mentioned above if it is steel materials, shape steels, such as I shape steel, angle steel, and channel steel, will be used. A combination or a square steel pipe may be used.
The partition member 3 according to the present reference example 2 is made up of a plurality of plate materials curved with a required curvature by appropriately adding a welding or bolt joining means to form a ring shape.

In the self-supporting temporary closing method according to the reference example 2 , after the base member 8 'is disposed at a predetermined portion on the foundation 11, the tubular temporary body 1 constructed on the carriage is lowered by a lifting machine. It is placed at a predetermined position on the foundation 11 of the underwater pier 10. Thereafter, the support member 2 is installed on the base member 8 ', and the partition member 3 is arranged in a ring shape. Subsequent work for placing water-stopping concrete proceeds in the same way as in Example 1 above (see paragraph [00 28 ]). After all these underwater operations have been completed, the underwater bridge pier 10 is reinforced or repaired. Start.

According to free-standing temporary deadline structural and self-supporting temporary deadline method according to the reference example 2, operations and effects according to the above Example 1 (paragraph [00 30] See) be exerted is of course, the above Reference Example 1 Similarly, the support material 2 is installed on the upper surface of the base member 8 ′ and the waterproof concrete 4 and is detachably installed on the base member 8 ′ with anchor bolts 5. The removal work can be performed simply by removing the anchor bolt 5, and compared with the first embodiment, it is not necessary to perform the work of turning the water-stopping concrete 4, which is very convenient. Even if compared with the prior art mentioned in the above-mentioned background art section, it can be removed with the same or less effort.
[Reference Example 3]

Figure 5 shows a reference example 3 of the own Tatsushiki provisional deadline structural and self-supporting temporary deadline method. The self-standing temporary cutoff structure according to FIG. 5 shows an embodiment in which the partition member 3 is not used by forming the base member 8 according to the reference example 1 in a ring shape.
The base member (underwater concrete) 18 according to the illustrated example is implemented by placing underwater concrete into a mold assembled in a ring shape so as to surround the underwater bridge pier 10. The base member 18 is provided in a portion where a space for placing the water-stopping concrete 4 can be secured as well as the support member 2 installed on the base member 18 in a size that can be supported in a stable state. Incidentally, the height dimension of the base member 18 according to the illustrated example is about 200 mm. In order to improve the fixing property between the base member 18 and the base 11, the upper surface of the base 11 is roughened, and an anchor 9 (or a reinforcing bar) such as a deformed steel bar is driven into the base 11 to construct the base member 18. Such ideas are appropriately performed.

In the self-supporting temporary closing method according to the reference example 3 , the base member 18 is constructed in a ring shape at a predetermined part on the foundation 11, and then the tubular temporary structure 1 constructed on the trolley is lowered by a lifting machine. Then, it is placed at a predetermined position on the foundation 11 of the underwater pier 10. Thereafter, the support material 2 is installed on the base member 8. Subsequent work for placing water-stopping concrete proceeds in the same way as in Example 1 above (see paragraph [00 28 ]). After all these underwater operations have been completed, the underwater bridge pier 10 is reinforced or repaired. Start.

According to the self-supporting temporary fastening structure and the self-supporting temporary fastening method according to the reference example 3 , the supporting material 2 is not limited to the effects of the first embodiment (see paragraph [00 30 ]). Since the base member 18 and the water-stopping concrete 4 are installed on the upper surface of the base member 18 and the base member 18 is detachably installed with the anchor bolt 5, the anchor bolt 5 is removed from the support member 2 in water. Compared with the above-mentioned Example 1, it is not necessary to work on the water-stopping concrete 4 and is very convenient. Even if compared with the prior art mentioned in the above-mentioned background art section, it can be removed with the same or less effort.
Further, since the wall surface of the base member 18 also serves as the partition member 3, the partition member 3 becomes useless, contributing to the reduction of the steel material cost required for the partition member 3, and the sealing means and fixing accompanying the installation of the partition member 3. Means become useless and workability is improved.
In the illustrated example, the base member 18 formed in a ring shape is made of underwater concrete. However, the present invention is not limited to this, and the same can be applied to the H-section steel 8 ′ used in the reference example 2 . In this case, the H-section steel 8 'close to the cylindrical temporary body 1 is formed into a ring shape by appropriately adding a plurality of H-sections obtained by bending with a required curvature by means of welding or bolt joining, and the partition material 3 It is implemented as a base member that also serves as a role.
[Reference Example 4]

Figure 6 shows a reference example 4 of the own Tatsushiki provisional deadline structural and self-supporting temporary deadline method. The self-supporting temporary closing structure according to the reference example 4 is a variation of the reference example 1 , and shows a preferable example when the upper surface of the foundation 11 of the underwater bridge pier 10 as a construction object is inclined.
In the self-supporting temporary closing structure according to the reference example 4 , the base member (underwater concrete) 8 according to the reference example 1 is formed on the foundation 11 whose upper surface is inclined so that the upper surface is horizontal. . Therefore, irrespective of the form of the foundation 11 having a special shape such as the top surface being inclined, the support material 2 (the support material 21) can be installed in the vertical direction without any effort, and rational construction can be performed. Other configurations and construction procedures are the same as those in Reference Example 1 (see paragraphs [00 31 ] and [00 32 ]).

According to free-standing temporary deadline structural and self-supporting temporary deadline method according to this reference example 4, of course it is possible to achieve the operation and effect according to Reference Example 1 (see paragraph [00 33]), and the upper surface is inclined Regardless of the form of the foundation 11 having a special shape such as being present, the support material 2 (the support material 21) can be installed in the vertical direction without any effort. Therefore, extremely reasonable construction can be realized and it has excellent flexibility.
In addition, the base member 8 according to FIG. 6 is formed in a ring shape so as to surround the underwater bridge pier 10 as in the above-described Reference Example 3 , so that the partition member 3 can be dispensed with.
[Reference Example 5]

Figure 7 shows a reference example 5 of the self Tatsushiki provisional deadline structural and self-supporting temporary deadline method. The self-supporting temporary cutoff structure according to the reference example 5 is mainly different from the first embodiment in that the partition material 3 is not used by substituting the partition wall 3 for the outer wall surface of the foundation 11 of the underwater pier 10. Is different. In addition, the installation site | part of the cylindrical temporary body 1 and the support material 2 and the placement site | part of the waterproofing concrete 4 are also different. In addition, since structural members, such as the cylindrical temporary body 1 and the support material 2, are the same as that of the said Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted suitably.
The support material 2 is installed on the outer peripheral edge of the foundation 11 in a state of protruding from the foundation 11. For this reason, since the said cylindrical temporary body 1 cannot naturally be mounted on the base 2, it implements by the structure mounted on the support member 13 attached to the ring shape along the outer wall surface of the base 11. Yes.
The support member 13 is preferably an angle member provided with stiffeners in place. The angle member is fixed to the outer wall surface of the foundation 11 by anchor bolts 5.
The water-stopping concrete 4 is placed in a ring-shaped concave groove formed by the outer wall surface of the foundation 11, the upper surface of the support member 13, and the lower end of the cylindrical temporary body 1, and is flush with the upper surface of the foundation 11. Is formed.
Other configurations and construction procedures are the same as those in the first embodiment except that the support member 13 is fixed along the outer wall surface of the foundation 11 prior to the installation work of the cylindrical temporary body 1.

According to the self-supporting temporary fastening structure and the self-supporting temporary fastening method according to the reference example 5 , the same effect as that of the first embodiment can be obtained (see paragraph [00 30 ]), and the partition member 3 can be used without being used. There are advantages. In addition, even when the upper surface area of the existing foundation 11 is slightly small, there is an advantage that the support material 2 and the cylindrical temporary body 1 can be installed without adding the foundation 11. Furthermore, after the construction is completed, there is an advantage that the support material 2 can be easily removed simply by removing the anchor bolt 5.

FIG. 8 shows a variation of Reference Example 5 . As shown in FIG. 8, when the foundation 11 is low, it can be similarly implemented by placing the tubular temporary body 1 on the support member 14 raised from the bottom of the water instead of the support member 13. Of course, the same effects as those of Reference Example 5 are obtained.

FIG. 9 shows different embodiments of the self-supporting temporary fastening structure and the self-supporting temporary fastening method according to the present invention. Free-standing temporary deadline structure according to the second embodiment is different from the first embodiment, the site of installation tubular temporary body 1 and pre-supports 2, and placing means of the tubular temporary body 1 differs mainly . Since the structural members such as the cylindrical temporary body 1, the support material 2, and the partition material 3 are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.
The support material 2 is installed on the outer peripheral edge of the foundation 11 in a state of projecting outward from the foundation 11. For this reason, since the said cylindrical temporary body 1 cannot be mounted naturally on the foundation 2, in the present Example 2 , it is attached to the lower surface of the horizontal material 22, and the overhang | projection plate 17 extended horizontally outwardly is used. It is implemented with a configuration that is placed on the upper surface. About another structure and construction procedure, it is the same as that of the said Example 1 except performing the mounting operation | work of the cylindrical temporary body 1 after finishing the installation operation | work of the support material 2. FIG.
That is, in the self-supporting temporary closing structure according to the second embodiment, the tubular temporary body 1 is provided so as to surround the existing underwater bridge pier 10, and the interior of the tubular temporary body 1 is drained to form the work space 12. An overhanging plate 17 is provided on the upper surface of the outer periphery of the foundation 11 of the underwater pier 10 so as to project horizontally outward. The tubular temporary body 1 is provided on the upper surface of the overhang plate 17 in the outer portion of the foundation 11 of the underwater pier 10. Inside the tubular temporary body 1, a column material 21 rising above the water level along the inner wall surface of the cylindrical temporary body 1 and a horizontal material 22 provided at the lower end of the column material 2 are rigidly connected in an L shape. A plurality of support members 2 thus formed are installed in a configuration in which water pressure acting on the cylindrical temporary body 1 is transmitted. A partition material 3 for preventing leakage of the water-stopping concrete 4 is provided in a ring shape in an arrangement facing the inner wall surface of the lower end portion of the tubular temporary body 1. Each of the plurality of support members 2 is installed by bolting the horizontal member 22 to the upper surface of the foundation 11 of the underwater bridge pier 10 by arranging the horizontal member 22 in a direction perpendicular to the tubular temporary body 1. The water-stopping concrete 4 is placed in a concave groove formed by the lower end of the body 1, the partition material 3, and the upper surface of the overhang plate 17, and the support material 2 is formed by the support material 21 and the horizontal material 22. L-shaped corners are embedded in the still water concrete 4.

According to free-standing temporary deadline structural and self-supporting temporary deadline method according to the second embodiment, the same effects as in Example 1 (paragraph [00 30] Referring) In addition, the top surface area of the existing foundation 11 slightly Even if it is small, there is an advantage that the support material 2 and the tubular temporary body 1 can be installed without adding the foundation 11.

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. Note that it includes the range.

DESCRIPTION OF SYMBOLS 1 Cylindrical temporary body 2 Support material 3 Partition material 4 Water-stop concrete 5 Anchor bolt 6 Plate 7 Anchor 8 Base member (underwater concrete)
8 'Base member (H-section steel)
9 Anchor 10 Underwater bridge pier 11 Foundation 12 Work space 13 Support member 14 Support member 15 Anchor bolt 16 Bolt 17 Overhang plate 18 Base member (underwater concrete)
19 Reinforcement ring 20 Underwater bridge pier 21 Post material 22 Horizontal material 23 Diagonal material H Water level

Claims (5)

A self-supporting temporary closing structure in which a cylindrical temporary body is provided so as to surround an existing underwater bridge pier, and water is drained inside the cylindrical temporary body to form a work space,
The tubular temporary body is provided on the upper surface of the foundation of the underwater pier,
Inside of the tubular temporary body, it is rigidly connected with the struts that rising above the water level along the inner wall surface of the cylindrical temporary body, the L-shape in the horizontal provided at a lower end of said supporting pillar member A plurality of supporting materials are installed in a configuration in which water pressure acting on the cylindrical temporary body is transmitted;
The partition member to prevent leakage of the waterproofing concrete arrangement which faces the inner wall surface of the lower end portion of the tubular temporary member is provided in a ring shape,
Each of the plurality of support members is installed by being bolted to the upper surface of the foundation of the underwater bridge pier by arranging the horizontal member in a direction perpendicular to the tubular temporary body, and a bottom end portion of the tubular temporary body , The L-shaped corner formed by the support material of the support material and the horizontal material is formed by water-stopping concrete in a groove formed by the partition material and the upper surface of the foundation of the underwater bridge pier, and the water-stopping concrete A self-supporting temporary closing structure characterized by being embedded inside . A self-supporting temporary closing structure in which a cylindrical temporary body is provided so as to surround an existing underwater bridge pier, and water is drained inside the cylindrical temporary body to form a work space,
An overhanging plate is provided on the upper surface of the outer peripheral portion of the foundation of the underwater pier so as to project horizontally outward.
The tubular temporary body is provided on the upper surface of the overhang plate in the outer part of the foundation of the underwater bridge pier;
A support material which is rigidly connected in an L shape with a column material standing above the water level along the inner wall surface of the cylindrical temporary structure and a horizontal material provided at the lower end of the column material inside the cylindrical temporary structure. However, a plurality of water pressures that are applied to the tubular temporary body are transmitted.
A partition material for preventing leakage of water-stopping concrete is provided in a ring shape in an arrangement facing the inner wall surface of the lower end portion of the cylindrical temporary body,
Each of the plurality of support members is installed by being bolted to the upper surface of the foundation of the underwater bridge pier by arranging the horizontal member in a direction perpendicular to the tubular temporary body, and a bottom end portion of the tubular temporary body, The L-shaped corner formed by the support material of the support material and the horizontal material is placed in the groove formed by the partition material and the upper surface of the projecting plate, and the L-shaped corner portion is formed in the water-resistant concrete. A self-supporting temporary cut-off structure characterized by being embedded. The cylindrical temporary body is formed by connecting a plurality of liner plates, corrugated sheets, steel segments, or PC segments to each other in a circumferential direction and a height direction . Self-supporting temporary deadline structure. A self-supporting temporary closing method in which a tubular temporary body is provided so as to surround an existing underwater bridge pier, and a working space is formed by draining water inside the cylindrical temporary body,
The tubular temporary body is provided on the upper surface of the foundation of the underwater bridge pier, and is provided on the inner side of the tubular temporary body, on a support column that rises above the water level along the inner wall surface of the cylindrical temporary structure, and on the lower end of the support column. Installing a plurality of supporting members rigidly joined in an L shape with the horizontal member formed in a configuration in which water pressure acting on the cylindrical temporary structure is transmitted;
Providing a partition material that prevents leakage of water-stopping concrete in an arrangement facing the inner wall surface of the lower end portion of the tubular temporary body, in a ring shape;
Each of the plurality of support members is disposed by placing the horizontal member in a direction perpendicular to the tubular temporary body and bolted to the upper surface of the foundation of the underwater bridge pier, and a lower end portion of the tubular temporary body, The L-shaped corner portion formed by the support material and the horizontal material is placed in the groove portion formed by the partition material and the upper surface of the foundation of the submerged bridge pier, and the L-shaped corner portion is formed by the water-resistant concrete. A self-supporting temporary closing method characterized in that the inside of the cylindrical temporary structure is drained after being embedded inside and the water-stopping concrete is cured. A self-supporting temporary closing method in which a tubular temporary body is provided so as to surround an existing underwater bridge pier, and a working space is formed by draining water inside the cylindrical temporary body,
On the upper surface of the outer periphery of the foundation of the underwater bridge pier, a projecting plate that projects horizontally outwards is provided. The cylindrical temporary body is provided on the upper surface of the projecting plate in the outer part of the foundation of the underwater bridge pier, and the column material that rises above the water level along the inner wall surface of the cylindrical temporary body inside the cylindrical temporary body. And installing a plurality of support members rigidly connected in an L shape with a horizontal member provided at the lower end of the support member in a configuration in which water pressure acting on the cylindrical temporary body is transmitted,
Providing a partition material that prevents leakage of water-stopping concrete in an arrangement facing the inner wall surface of the lower end portion of the tubular temporary body, in a ring shape;
Each of the plurality of support members is disposed by placing the horizontal member in a direction perpendicular to the tubular temporary body and bolted to the upper surface of the foundation of the underwater bridge pier, and a lower end portion of the tubular temporary body, The L-shaped corner formed by the support material and the horizontal material is placed in the groove formed by the partition material and the upper surface of the projecting plate, and the L-shaped corner portion is formed in the water-resistant concrete. A self-supporting temporary closing method characterized in that water is drained from the inside of the tubular temporary body after being embedded and the water-stopping concrete is hardened.

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