JP7028639B2 - Filling construction method for joints - Google Patents

Description

The present invention relates to a method for filling a joint portion, and in particular, joins adjacent precast concrete decks to each other by filling and solidifying the joint portions of a plurality of precast concrete decks arranged side by side in the continuous installation direction. It relates to the filling construction method of the joint part used at the time.

For example, in road bridges, it is expected that the number of works to remove old concrete decks and replace them with new concrete decks will increase in the future. Road bridges are formed by supporting multiple bridge girders erected on pedestals and pedestals, installing concrete decks on these girders, and applying asphalt pavement, and are aging. At the time when the new concrete deck was constructed, the concrete deck was mainly made of cast-in-place concrete, but when replacing it with a new concrete deck, the construction period was shortened and the road bridge was opened as soon as possible. In order to make it possible, the mainstream work is to form a concrete deck using a precast concrete deck (hereinafter referred to as a precast concrete deck) that has been accurately formed in advance at a factory or the like (for example). , Patent Document 1).

For example, when a concrete deck of a road bridge is formed using a precast concrete deck, for example, the width B of the extension direction X of the bridge girder 50 is about 180 cm, and it is perpendicular to the extension direction X of the bridge girder 50, as shown in FIG. A plurality of precast concrete decks 10 formed so that the length L in the direction Y is about 10 m, and joint portions 11 having a width of about 20 to 40 cm, for example, in the extension direction X of the bridge girder 50. By interposing a plurality of them side by side at a pitch of, for example, about 2 m, and then supplying concrete to the joint portion 11 to solidify the concrete, the precast concrete decks 10 installed adjacent to each other are joined together. It has become. Further, the end of the reinforcing bar 16 embedded in the precast concrete slab 10 protrudes from the end face of each precast concrete slab 10 in the width direction (extending direction of the bridge girder) (see FIG. 2), and the joint portion. In 11, a concrete floor in which a plurality of precast concrete slabs 10 are firmly joined and integrated by supplying and solidifying concrete in a state where the ends of the reinforcing bars 16 protruding from these opposite end faces are wrapped. It becomes possible to obtain version 20.

JP-A-2017-179926

On the other hand, for example, in a road bridge, it is necessary to form a drainage gradient of, for example, about 1.5 to 2% for draining rainwater that has fallen on the road surface as a cross slope in the crossing direction of the road, and in the curved portion of the road. It is necessary to form a road gradient of, for example, about 6% in order to stabilize the running of the vehicle as a cross slope in the crossing direction of the road. Therefore, the precast concrete deck 10 forming the concrete deck 20 may also be formed so as to have a cross slope Z on the surface portion, and the joint of the precast concrete deck 10 having the cross slope Z on the surface portion. The concrete of the portion 11 needs to be formed so as to have a cross slope on the surface portion.

When forming the concrete of the joint portion 11 so as to have a transverse gradient Z on the surface portion, in consideration of workability, particularly when a high-strength concrete having high fluidity and excellent self-leveling property is used as the concrete. The concrete supplied to the joint portion 11 tends to overflow from the upper surface opening of the joint portion 11 because the surface tends to be horizontal in the downstream portion of the transverse gradient, which makes it difficult to finish the surface of the concrete. ..

For this reason, in the conventional construction method, for example, as shown in FIG. 6, a presser form 12'is installed so as to cover the upper surface opening of the joint portion 11', and the set presser form 12'and precast concrete on both sides are installed. The concrete 15'filled by supplying concrete 15' from the upstream side of the transverse gradient to the filling space 14' surrounded by the side surface portion 10a' of the deck 10'and the bottom formwork 13'. A construction method was adopted to prevent concrete from overflowing from the joint portion 11'. Further, in the conventional construction method shown in FIG. 6, in the presser form 12', the spacer member 30'is interposed between the upper surface of the end edge portion of the precast concrete deck 10'on both sides of the joint portion 11'. , The lower surface is arranged at a position about 5 mm higher than the upper surface of the precast concrete deck 10'and the upper surface opening of the joint portion 11', and can be attached. When the concrete 15'is filled in the filling space 14', the air that escapes from the concrete 15'is released to the raised portion sandwiched by the spacer members 30'on both sides, so that the raised portion after solidification is formed. The concrete 15a'was removed to allow good quality concrete 15'to be obtained at the joint 11', which is below the top surface of the precast concrete deck 10'.

However, in the conventional construction method shown in FIG. 6, the raised portion of the concrete sandwiched between the spacer members 30'on both sides, which is additionally filled to allow air to escape from the concrete 15'filled in the filling space 14', is used. When the presser form 12'and the spacer member 30' are removed after the filled concrete 15'is solidified, the 15a'protrudes from the upper surface of the precast concrete deck 10' while maintaining a considerable volume. Since it is left in a state, it takes a lot of time and effort to scrape off the concrete 15a'of such a protruding portion and finish the surface of the joint portion 11'.

That is, for example, in a road bridge, it is necessary to lay a waterproof layer on the upper surface of the formed concrete deck 20 prior to constructing asphalt pavement, and in order to lay the waterproof layer, the concrete of the joint portion 11 is laid. It is necessary to finish the upper surface (surface) of 15 so as to be flush with the upper surface (surface) of the high-quality precast concrete deck 10 formed in advance in a factory or the like with high accuracy, and to be smooth and uniform. For this reason, it is necessary to scrape off the concrete 15a'of the joint portion 11'that protrudes from the upper surface of the precast concrete deck 10', and scrape off the concrete 15a'of the joint portion 11'. Finishing the surface requires a lot of labor, such as rough cutting and polishing. In addition, dust and noise are generated during polishing, which affects the surrounding environment. In particular, when high-strength concrete having high fluidity and excellent self-leveling property is used as the concrete 15'of the joint portion 11', it becomes necessary to repeat rough cutting and polishing work a plurality of times. It will take more time and effort.

INDUSTRIAL APPLICABILITY The present invention can effectively reduce the labor of finishing the concrete surface of the joint portion of the precast concrete deck having a transverse gradient so that it is flush with the surface of the precast concrete deck and is smooth. It is an object of the present invention to provide a filling construction method.

INDUSTRIAL APPLICABILITY The present invention is a method for filling a joint portion used when joining adjacent precast concrete slabs to each other by filling and solidifying the joint portion of a plurality of precast concrete slabs arranged side by side in the continuous installation direction. The precast concrete slabs arranged side by side are provided with a cross slope inclined in the direction perpendicular to the continuous installation direction on the surface portion, and cover the upper surface opening of the joint portion to form a holding mold. It is installed so as to straddle the precast concrete slabs on both sides of the joint portion, and the concrete of the joint portion is the installed presser mold, the side portions of the precast concrete slabs on both sides, and the bottom mold. The filling space surrounded by the concrete is supplied from the upstream side of the transverse gradient to be filled, and an air reservoir is provided on the lower surface of the portion of the holding mold that covers the upper surface opening of the joint portion. A plurality of linear concave grooves to be formed are formed over the entire lower surface of the portion covering the upper surface opening of the joint portion, and the air that escapes upward from the concrete when the concrete is filled is allowed to flow upward from the concrete. The above object is achieved by providing a method for filling a joint portion in which concrete is filled in the filling space while being stored in a groove.

In the method for filling the joint portion of the present invention, it is preferable that the linear concave groove is formed so as to have a groove depth of 2 to 5 mm.

Further, in the method for filling the joint portion of the present invention, it is preferable that the linear concave groove is formed so as to have a triangular cross-sectional shape.

Further, in the filling construction method of the joint portion of the present invention, it is preferable that the linear concave grooves are arranged in a direction perpendicular to the extending direction thereof and connected to each other.

Furthermore, in the method of filling the joint portion of the present invention, the linear concave groove is formed so that the extension direction is along the inclination direction of the transverse gradient of the surface portion of the precast concrete deck. Is preferable.

Further, in the method of filling the joint portion of the present invention, the presser form is installed so as to cover the upper surface opening of the joint portion and to be sequentially added from the downstream side to the upstream side of the transverse gradient. The filling space surrounded by the presser form that was sequentially added, the side parts of the precast concrete decks on both sides, and the bottom formwork is filled with concrete sequentially from the downstream side to the upstream side of the cross slope. It is preferable that it is.

Further, in the method of filling the joint portion of the present invention, the presser form that is sequentially added from the downstream side to the upstream side of the cross slope is formed into a linear concave groove formed in the presser form on the downstream side. It is preferable that the linear concave groove formed in the presser form on the upstream side is arranged so as to communicate with each other so as to cover the upper surface opening of the joint portion.

Further, in the method for filling the joint portion of the present invention, it is preferable that the presser form is a molded product made of a transparent synthetic resin.

According to the method of filling the joint portion of the present invention, it is effective to finish the concrete surface of the joint portion of the precast concrete deck having a transverse gradient so that it is flush with the surface of the precast concrete deck and is smooth. Can be reduced.

It is a schematic perspective view explaining the construction which installs the new concrete deck by the precast concrete deck to the road bridge to which the filling construction method of the joint part which concerns on one preferred embodiment of this invention is applied. It is an enlarged view of the part A of FIG. 1 explaining the filling construction method of the joint part which concerns on one preferable embodiment of this invention. It is a top view explaining the state in which a plurality of precast concrete decks are arranged side by side at a predetermined pitch in the extension direction of a bridge girder with a joint portion interposed therebetween. It is sectional drawing which follows BB of FIG. 2 explaining the filling construction method of the joint part which concerns on one preferable embodiment of this invention. It is an enlarged view of the part C of FIG. 4 explaining the state which the air is accumulated in the linear concave groove. It is sectional drawing which follows the BB of FIG. 3 explaining the conventional filling construction method of a joint part.

The method for filling the joint portion according to a preferred embodiment of the present invention is, for example, a work of removing an aged concrete deck in a road bridge shown in FIG. 1 and replacing it with a new concrete deck 20 by a precast concrete deck 10. In, as shown in FIG. 2, it is carried out by covering the upper surface opening of the joint portion 11 between the adjacent precast concrete decks 10 and installing the holding mold 12. In the method of filling the joint portion according to the present embodiment, concrete cast in the field is supplied to the joint portion 11 and solidified, so that when adjacent precast concrete slabs 10 are joined and integrated, the joint portion 11 is formed. The concrete 15 (see FIG. 4) is traversed by a filling space 14 surrounded by side surface portions 10a of the precast concrete floor slabs 10 on both sides, a bottom formwork 13, and a holding formwork 12 covering the upper surface opening of the joint portion 11. It was adopted as a construction method for supplying and filling from the upstream side of the gradient Z.

That is, in the present embodiment, the road bridge is, for example, a road bridge constituting a curved portion of the road, and the formed concrete deck 20 is for a road slope inclined to one side in the crossing direction of the road. For example, it has a cross slope Z of about 6%. Further, the precast concrete deck 10 forming the concrete deck 20 is also formed so as to have a cross slope Z for the road slope on the surface portion, and the precast concrete deck 10 having these cross slopes Z is provided. The concrete of the joint portion 11 between them also needs to be formed so as to have a transverse gradient Z on the surface portion.

Therefore, in the present embodiment, the concrete 15 in a state of not being solidified supplied to the joint portion 11 has a transverse gradient, especially when a high-strength concrete having high fluidity and excellent self-leveling property is used. Since the surface of the downstream portion of Z tends to be horizontal, it tends to overflow from the upper surface opening of the joint portion 11. Therefore, it covers the upper surface opening of the joint portion 11 and is preferably a presser form from the downstream side of the transverse gradient Z. A frame 12 is installed, and concrete is placed in the filling space 14 surrounded by the installed presser form 12, the side surface portions 10a of the precast concrete deck 10 on both sides, and the bottom form 13 from the upstream side of the transverse gradient Z. By supplying and filling the concrete 15 (see FIG. 4), the filled concrete 15 can be prevented from overflowing from the joint portion 11.

Further, in the method of filling the joint portion of the present embodiment, as described above, the filling space 14 surrounded by the presser form 12, the side surface portions 10a of the precast concrete deck 10 on both sides, and the bottom form 13 is used. When the concrete 15 (see FIG. 4) is supplied and filled from the upstream side of the transverse gradient Z, the air released from the filled concrete 15 is sent above the upper surface of the precast concrete deck 10 and the upper surface opening of the joint portion 11. It takes time and effort to make the concrete surface of the solidified joint portion 11 flush with the surface of the precast concrete floor slab 10 and to be smooth after the filled concrete 15 is solidified. It has a function that enables effective reduction.

As shown in FIGS. 1 to 3, the method of filling the joint portion of the present embodiment is a joint portion of the precast concrete floor slab 10 arranged side by side in the extension direction X of the bridge girder 50 which is the continuous installation direction. It is a filling construction method used when adjoining adjacent precast concrete slabs 10 by filling 11 with concrete 15 and solidifying the concrete 15, and a plurality of precast concrete slabs 10 arranged side by side are connected in the continuous direction X. The surface portion is provided with a transverse gradient Z that is inclined to one side in the direction Y perpendicular to the direction Y, and the concrete 15 of the joint portion 11 covers the upper surface opening of the joint portion 11 and is a presser form as shown in FIG. 12 is installed (see FIG. 2), and the upstream side of the cross slope Z is provided in the filling space 14 surrounded by the installed presser form 12, the side surface portions 10a of the precast concrete floor slabs 10 on both sides, and the bottom form 13. It is supplied from and filled. As shown in FIG. 4, a linear concave groove 12a forming an air reservoir portion covers the upper surface opening of the joint portion 11 on the lower surface of the portion of the presser form 12 that covers the upper surface opening of the joint portion 11. A plurality of pieces are formed over the entire lower surface of the portion, and the filling space 14 is filled with the concrete 15 while collecting the air that escapes upward from the concrete 15 in the plurality of linear concave grooves 12a when the concrete 15 is filled. It has become.

Further, in the present embodiment, the linear concave groove 12a is preferably formed so as to have a triangular cross-sectional shape, and is formed by arranging a plurality of linear concave grooves 12a in a direction perpendicular to the extending direction thereof. Further, the linear concave groove 12a extends in the direction Y perpendicular to the continuous installation direction X of the precast concrete deck 10, which is the inclination direction of the transverse gradient Z of the surface portion of the precast concrete deck 10. , It is formed so as to follow.

In the present embodiment, the road bridge to which the old concrete deck is removed and replaced with the new concrete deck 20 by the precast concrete deck 10 is, for example, a road bridge constituting a curved portion of a highway. As shown in FIG. 1, a plurality of bridge girders 50 are erected with extension directions X arranged in parallel so as to be supported by bridge pedestals 51 constructed at predetermined intervals in the extension direction of the road. ing. Supporting these bridge girders 50, a plurality of precast concrete decks 10 have a width of, for example, about 15 to 50 cm, more preferably 20 to 40 cm, in the extension direction X of the bridge girder 50, as shown in FIGS. 2 and 3. A plurality of joint portions 11 are installed side by side at a pitch of, for example, about 2 m while interposing joint portions 11 at intervals of about 2 m. The precast concrete deck 10 is formed so that, for example, the width B of the extension direction X of the bridge girder 50 is about 180 cm, and the length L of the direction Y perpendicular to the extension direction X of the bridge girder 50 is about 10 m. The end portion of the reinforcing bar 16 embedded in the precast concrete deck 10 projects from the side surface portion 10a which is the end surface of each precast concrete deck 10 in the width direction (extending direction of the bridge girder). In the joint portion 11, the end portions of the reinforcing bars 16 protruding from the facing side surface portions 10a are wrapped, and reinforcing bars for reinforcement are appropriately arranged.

Further, in the present embodiment, in the bottom surface portion of each precast concrete deck 10, concrete is poured into the end edges on both sides along the extension direction X and the direction Y perpendicular to the extension direction X of the bridge girder 50, and then the structure is constructed. An embedded formwork 13a, which is a part of the formwork that does not require dismantling, is preliminarily attached so as to project to both sides at the time of manufacturing the precast concrete deck 10 (see FIGS. 2 and 3). When a plurality of precast concrete floor slabs 10 are supported by the bridge girder 50 and installed side by side, the bottom formwork 13 is formed by abutting the embedded formwork 13a at each joint portion 11 so that the bottom form 13 is formed on the bottom surface portion of the joint portion 11. Formed in. Further, in the present embodiment, the downstream end of the cross slope Z of the joint portion 11 is aligned with the side surface of the end portion in the direction Y perpendicular to the extension direction X of the bridge girder 50 of the precast concrete deck 10. The wife mold 17 is attached by a known method (see FIG. 2).

Then, in the present embodiment, the presser form 12 is formed by covering the upper surface opening of the joint portion 11 from the downstream side of each joint portion 11 to which the bottom form 13 and the end form 17 are attached , preferably from the downstream side of the transverse gradient Z. In the filling space 14 surrounded by the presser formwork 12 installed and installed, the side surface portions 10a of the precast concrete deck 10 on both sides, and the bottom formwork 13, the concrete 15 of the joint portion 11 from the upstream side of the cross slope Z. Is to be supplied and filled.

Here, in the present embodiment, as shown in FIG. 4, the presser form 12 is wider than the width of the joint portion 11 provided at an interval of, for example, about 15 to 50 cm in the extension direction X of the bridge girder 50, for example. It has a large width, for example, about 30 to 60 cm. The presser form 12 covers the upper surface opening of the joint portion 11 with an intermediate portion having a linear concave groove 12a formed on the lower surface side, which is a portion between the side end portions 12b on both sides, and forms a portion directly above the intermediate portion. In the arranged state, it is attached so as to straddle the precast concrete decks 10 on both sides of the joint portion 11. The presser form 12 has a length of, for example, about 1.5 m, and the presser form 12b is placed on the side edges of the precast concrete floor slabs 10 on both sides. The stiles 18 arranged at predetermined intervals in the length direction of the frame 12 are attached so as to cross each other in the width direction of the presser form 12, and both sides of the stile 18 protruding from the presser form 12 are both sides. By driving the anchor member 19 toward the precast concrete slab 10, the anchor member 19 is fixed in a state where it does not rise from the precast concrete slab 10. As a result, a filling space 14 is formed, which is surrounded by the presser form 12, the side surface portions 10a of the precast concrete decks 10 on both sides, and the bottom form 13.

Further, in the present embodiment, the presser form 12 has a length of, for example, about 1.5 m, and the joint portion 11 between the adjacent precast concrete decks 10 has a length of, for example, about 10 m. Therefore, the joint portion 11 is installed so as to cover the upper surface opening of the joint portion 11 and to be sequentially added from the downstream side to the upstream side of the transverse gradient Z (see FIG. 2). In the filling space 14 surrounded by the presser form 12 which is sequentially added, the side surface portions of the precast concrete deck 10 on both sides, and the bottom form 13, the concrete 15 is formed from the downstream side to the upstream side of the cross slope Z. Are sequentially filled.

Further, in the present embodiment, the presser form 12 is formed by using, for example, an acrylic plate which is a molded product made of acrylic, preferably as a transparent synthetic resin. Since the presser form 12 is a molded product made of a transparent synthetic resin, it is possible to easily confirm the situation in which the concrete 15 is being filled in the filling space 14 while filling.

Furthermore, in the present embodiment, as described above, on the lower surface of the portion of the presser form 12 that covers the upper surface opening of the joint portion 11, a linear concave groove 12a forming an air reservoir portion is formed in the joint portion. A plurality of pieces are formed over the entire lower surface of the portion covering the upper surface opening of 11. Here, it is preferable that the linear concave groove 12a is formed so as to have a groove depth of 2 to 5 mm. Since the linear concave groove 12a has a groove depth of 2 mm or more, it is possible to reliably take in the air released from the air bubbles existing inside the filled concrete 15 into the inside of the groove. .. Since the linear concave groove 12a has a groove depth of 5 mm or less, it is possible to secure a sound concrete surface on the surface of the filled concrete 15.

Further, in the present embodiment, the linear concave groove 12a is preferably formed so as to have a groove width of 2 to 5 mm, and is preferably formed so as to have a triangular cross-sectional shape. Since the linear concave groove 12a has a groove width of 2 to 5 mm, it is possible to reliably take in the air released from the air bubbles existing inside the filled concrete 15 into the inside of the groove. At the same time, it becomes possible to secure a sound concrete surface on the surface of the filled concrete 15. Since the linear concave groove 12a has a triangular cross-sectional shape, the air released from the air bubbles and the filled sound concrete 15 are surely arranged inside the groove in a state of being separated into upper and lower parts. It becomes possible to do so. The linear concave groove 12a does not necessarily have to have a triangular cross-sectional shape, and may have various other cross-sectional shapes such as a semicircular shape, a rectangular shape, and a trapezoidal shape.

Further, it is preferable that a plurality of linear concave grooves 12a are arranged side by side in a direction perpendicular to the extending direction thereof and connected to each other. This makes it possible to more reliably take in the air that escapes from the air bubbles existing inside the filled concrete 15 into the inside of the groove, and more reliably to make a sound concrete surface on the surface of the filled concrete 15. It will be possible to secure it. Further, as will be described later, even when the presser form 12 is sequentially added from the downstream side to the upstream side of the transverse gradient Z, the air released from the air bubbles can be easily removed from the end of the added form. Become. The linear concave grooves 12a do not necessarily have to be formed by arranging and connecting a plurality of linear concave grooves in a direction perpendicular to the extending direction thereof, and the linear concave grooves 12a are arranged side by side so as to intersect vertically and horizontally, or are adjacent linear concave grooves. They may be arranged side by side while maintaining a certain distance between the grooves 12a.

Furthermore, it is preferable that the linear concave groove 12a is formed so that the extending direction thereof is along the inclination direction of the transverse gradient Z of the surface portion of the precast concrete deck 10. As a result, when the concrete 15 is filled, the air that has escaped upward from the concrete 15 and is stored in the linear concave groove 12a is removed from the end portion by the inclination of the linear concave groove 12a, so that the air is directed toward the outside air. It becomes possible to eliminate more smoothly.

Further, in the present embodiment, as described above, the presser form 12 is installed so as to cover the upper surface opening of the joint portion 11 and to be sequentially added from the downstream side to the upstream side of the transverse gradient Z. The presser form 12 to be sequentially added from the downstream side to the upstream side of the transverse gradient Z is a line formed in the presser form 12 on the upstream side in the linear concave groove 12a formed in the presser form 12 on the downstream side. It is preferable that the concave groove 12a having a shape is arranged so as to communicate with each other so as to cover the upper surface opening of the joint portion 11. As a result, the filling space 14 surrounded by the presser form 12 sequentially added, the side surface portions 10a of the precast concrete deck 10 on both sides, and the bottom form 13 is directed from the downstream side to the upstream side of the transverse gradient Z. By pulling out from the end due to the inclination of the linear concave groove 12a communicating between the added presser form 12 when the concrete is sequentially filled, the concrete is pulled out upward from the concrete 15 and the linear concave is formed. The air stored in the groove 12a can be discharged more smoothly toward the outside air.

In the method for filling the joint portion of the present embodiment, the presser form 12 having the above-mentioned configuration and having a plurality of linear concave grooves 12a formed on the lower surface of the portion covering the upper surface opening of the joint portion 11 is preferably used. Installed from the downstream side of the cross slope Z, the filling space 14 surrounded by the presser form 12, the side surface portions 10a of the precast concrete deck 10 on both sides, and the bottom form 13 is entered from the upstream side of the cross slope Z. , Preferably, high-strength concrete having high fluidity and excellent self-leveling property is supplied and filled as the concrete 15 of the joint portion 11. As such high-strength concrete, for example, the trade name "Slim Cleat" (manufactured by Obayashi Corporation), which is a room temperature curing type ultra-high strength fiber reinforced concrete, can be used.

The concrete 15 supplied to the filling space 14 is sufficiently compacted by being vibrated by using a known vibrating device such as a vibrator or by hitting the presser form 12 with a mallet. The filling space 14 is filled with the upper surface in close contact with the lower surface of the presser form 12 in which the plurality of linear concave grooves 12a are formed. Since a plurality of linear concave grooves 12a forming the air reservoir portion are formed on the lower surface of the presser form 12 over the entire area covering the upper surface opening of the joint portion 11, when the concrete 15 is filled. It is possible to fill the filling space 14 with the concrete 15 while accumulating the air flowing upward from the concrete 15 in the plurality of linear concave grooves 12a.

Then, according to the method of filling the joint portion of the present embodiment, the surface of the concrete 15 of the joint portion 11 of the precast concrete deck 10 having a transverse gradient Z is flush with the surface of the precast concrete deck 10. It is possible to effectively reduce the time and effort required for smooth finishing.

That is, according to the present embodiment, the concrete 15 of the joint portion 11 covers the upper surface opening of the joint portion 11 and preferably installs the presser formwork 12 from the downstream side of the transverse gradient Z, and the presser form 12 is installed. The filling space 14 surrounded by the side surface portions 10a of the precast concrete floor slabs 10 on both sides and the bottom formwork 13 is supplied from the upstream side of the cross slope Z and filled. A plurality of linear concave grooves 12a forming an air reservoir are formed on the lower surface of the portion covering the upper surface opening of the joint portion 11 of the joint portion 11 over the entire lower surface of the portion covering the upper surface opening of the joint portion 11. The filling space 14 is filled with the concrete 15 while accumulating the air that escapes upward from the concrete 15 in the plurality of linear concave grooves 12a when the concrete 15 is filled.

As a result, according to the present embodiment, as shown in FIG. 5, the amount of concrete 15 that tends to invade each linear concave groove 12a at the time of filling by the air stored in each linear concave groove 12a. When the presser form 12 is removed after the concrete 15 filled in the joint portion 11 is solidified, the solidified concrete 15 is left in a state of protruding from the upper surface of the precast concrete deck 10. It is possible to reduce the thickness and the amount of protruding concrete 15. As a result, the surface of the concrete 15 of the joint portion 11 is finished flushly and smoothly with the surface of the precast concrete deck 10 by rough-cutting or polishing the concrete 15 of such a protruding portion. It is possible to effectively reduce the labor of work, and it is also possible to effectively suppress the generation of dust and noise during polishing, which affects the surrounding environment. become.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, the presser form does not necessarily have to be a molded product made of a transparent synthetic resin, and the opaque product may be a molded product. The precast concrete deck does not necessarily have to form a concrete deck of a road bridge, but may form various other concrete decks such as a railroad bridge.

10 Precast concrete deck 10a Side part 11 Joint part 12 Presser formwork 12a Linear concave groove 12b Side end part 13 Bottom formwork 13a Buried formwork 14 Filling space 15 Joint part concrete 16 Reinforcing bar 17 Wife formwork 18 Crosspiece 19 Anchor member 20 Concrete deck 50 Bridge girder 51 Bridge pedestal X Extension direction of bridge girder (continuous installation direction)
Y Direction perpendicular to the continuous installation direction (extension direction) Z Transverse gradient

Claims (8)

It is a method of filling joints used when joining adjacent precast concrete decks to each other by filling concrete into the joints of precast concrete decks arranged side by side in the continuous installation direction and solidifying them.
A plurality of precast concrete slabs arranged side by side have a cross slope inclined in a direction perpendicular to the continuous installation direction on the surface portion, cover the upper surface opening of the joint portion, and provide a presser formwork to the joint portion. It is installed so as to straddle the precast concrete slabs on both sides, and the concrete of the joint part is surrounded by the installed presser form, the side surface portions of the precast concrete slabs on both sides, and the bottom formwork. The filling space is supplied from the upstream side of the transverse gradient and filled.
On the lower surface of the portion of the presser form that covers the upper surface opening of the joint portion, a plurality of linear concave grooves forming an air reservoir portion are formed over the entire lower surface of the portion that covers the upper surface opening of the joint portion. Is formed and
A method for filling a joint portion in which concrete is filled in the filling space while accumulating air that escapes upward from the concrete when filling the concrete in a plurality of the linear concave grooves. The method for filling a joint portion according to claim 1, wherein the linear concave groove is formed so as to have a groove depth of 2 to 5 mm. The method for filling a joint portion according to claim 1 or 2, wherein the linear concave groove is formed so as to have a triangular cross-sectional shape. The method for filling a joint portion according to any one of claims 1 to 3, wherein the linear concave groove is formed by arranging and connecting a plurality of the linear concave grooves in a direction perpendicular to the extending direction thereof. The joint portion according to any one of claims 1 to 4, wherein the linear groove is formed so that the extending direction is along the inclination direction of the transverse gradient of the surface portion of the precast concrete deck. Filling construction method. The presser form is installed by sequentially adding from the downstream side to the upstream side of the transverse gradient so as to cover the upper surface opening of the joint portion, and the presser form that is sequentially added and the precast concrete on both sides. One of claims 1 to 5, wherein the filling space surrounded by the side surface portion of the deck and the bottom formwork is sequentially filled with concrete from the downstream side to the upstream side of the cross slope. The described method for filling joints. The presser form, which is sequentially added from the downstream side to the upstream side of the transverse gradient, has a linear concave groove formed in the presser form on the downstream side and a linear shape formed in the presser form on the upstream side. The method for filling a joint portion according to claim 6, wherein the concave grooves are arranged so as to communicate with each other so as to cover the upper surface opening of the joint portion. The method for filling a joint portion according to any one of claims 1 to 7, wherein the presser form is a molded product made of a transparent synthetic resin.

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