JP2000319809A - Joint structure of highway bridge and construction method of expandable joint for highway bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve soundproof and waterproof functions in a joint of a highway bridge and also improve workability of the expandable joint. SOLUTION: A step 11 is formed at the upper part of the end of confronting floor slabs 1 with a laying gap 3 between the floor slabs and braces 14 projecting to the center of the laying gap 3 are fixed to respective floor slab end faces oppositely arranged in the laying gap 3 in the lower side of the step 11. A blocking member 2 for the gap is inserted in the laying gap 3 in a state compressed in the lengitudinal direction of the bridge and supported by the braces 14, 14. An expandable joint 4 is disposed above the blocking member 2 and post-cast concrete 12 is placed up to the road face level at the back of the expandable joint 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a road bridge joint and a method of constructing a road bridge expansion joint.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 60-11166 discloses an example of a structure of a road bridge joint. It is a construction in which a play insertion material is inserted in a play of a road bridge joint, an expansion joint is supported on the play insertion material via a cushion material, and post-cast concrete is cast on the back of the expansion joint. is there. At the time of construction, as described in Japanese Patent Publication No. 60-41162, a notch step is formed at an end of a road facing a space with a play space, and a play insertion material is inserted into the play space. The expansion joint is supported on the material via a cushion material, and the expansion joint is pushed down together with the play insertion material until the upper end of the expansion joint substantially matches the road surface. It is performed in the procedure of placing concrete after-cast.

[0003]

In recent years, floors have been increased due to the increase in span (distance between bridges of road bridges) or in order to prevent road bridges from colliding back and forth and falling down during an earthquake. Slab play (other than the separation between the slab end face and the slab end face,
(Including the separation between the end face of the floor slab and the chest wall of the abutment) tends to be larger than before. If the floor slab is widened in this way, even if the upper part of the floor slab is closed with an expansion joint, it is not possible to sufficiently prevent the leakage of vehicle running noise from the top of the bridge to the bottom of the bridge, It is also difficult to reliably prevent. Further, when constructing the expansion joint, parts and tools constituting the expansion joint, rubble such as concrete and asphalt generated during construction, etc. are easily dropped from the wide floor slab.

[0004] Although the play insertion material described in the section of the prior art is useful for soundproofing and waterproofing of the floor slab, it is merely inserted into the floor slab, so that it can be expanded and contracted due to the temperature change of the road bridge. As a result, there is a concern that the floor slab may fall under the bridge when the play space expands.

[0005] Therefore, an object of the present invention is to prevent the play insert from dropping, to realize good soundproofing and waterproofing for a long period of time, and to make the construction of expansion joints safe and easy. It is.

[0006]

The invention according to claim 1 is
A structure of a road bridge joint portion in which an expansion joint for smoothing traffic on a road surface while allowing expansion and contraction of the road bridge is constructed, and floors opposing each other with a floor gap below the expansion joint. A receiving member protruding toward the center of the slab is fixed to each of the slab end faces or to each of the slab end face and the abutment chest wall surface facing each other with the slab play, The stretchable play closing member is inserted in a compressed state in the direction of expansion and contraction of the road bridge, and is supported by the two receiving members.

Therefore, according to the above structure, since the gap between the slabs is compressed in the bridge length direction, the gap between the slabs is closed even if the gap between the slabs becomes wider due to a temperature change. The state can be maintained, and the soundproofing and waterproofing by the play closing material can be maintained for a long period of time. In addition, since the play closing member is supported by the receiving member, even when the play space of the floor slab greatly expands due to a temperature change, the play closing member is prevented from falling under the bridge, and the soundproof and waterproof function is provided for a long time. Can be demonstrated.

[0008] In addition to the reinforced concrete slab of the steel bridge, a slab of a RC (rain-forced concrete) girder and a factory-made prestressed concrete girder are used as the slab (PC girder). Bridge deck).

According to a second aspect of the present invention, in the structure of the road bridge joint portion according to the first aspect, the receiving member includes a vertical plate portion abutting on an end face of the floor slab or an abutment chest wall surface, and the vertical plate portion. And a horizontal plate portion protruding from the lower end of the portion toward the center of the floor slab. The space closing member is formed of rubber or sponge, and the vertical plate of the opposing receiving member is formed of rubber or sponge. It is characterized in that it is inserted in a state of being compressed in the bridge length direction between the parts and is received by the horizontal plate part.

[0010] Accordingly, since the play closing member is in close contact with the opposing surfaces of the vertical plate portion, not the concrete surface having minute irregularities, a high sealing property can be obtained. The sponge may be made of rubber or synthetic resin.

The invention according to claim 3 is a method of constructing a road bridge expansion joint for smoothing traffic on a road surface while allowing expansion and contraction of the road bridge. Forming a step which is lower than the road surface at the upper part of each of the end portions of the floor slab, or at the end of the floor slab and the abutment chest wall facing each other with a slab play, To the center of the floor slab, at each of the end faces of the slabs facing each other with the slabs below, or at each of the floor slabs and the abutment chest wall facing each other with the slabs. By fixing the receiving member projecting toward the floor plate, the space closing material having elasticity between the floor slabs is inserted in a compressed state in the direction of expansion and contraction of the road bridge, and is inserted and supported by the two receiving members, thereby allowing the floor slab to be closed. The expansion joint is closed and the expansion joint is disposed above the play closing member, and the rear side of the expansion joint is The Chi concrete characterized by pouring up to the road surface height.

Therefore, even when the play space of the floor slab is wide, the work of constructing the expansion joint can be performed in a state where the play space is closed by the play closing member, so that it is possible to prevent the parts and the like from dropping, After the construction, the falling of the play closing member can be prevented by the receiving member, and the soundproofing / waterproofing effect can be obtained for a long period of time.

[0013]

As described above, according to the first aspect of the present invention, each of the slab end faces opposing each other with a slab play below the expansion joint, or the slab end face and the abutment chest wall surface. A receiving member protruding toward the center of the floor slab is fixed to each of the slabs, and a play occluding material having elasticity is inserted between the floor slabs in a compressed state in the direction of expansion and contraction of the road bridge. Since it is supported by the member, the soundproofing and waterproofing effect can be maintained for a long period of time even when the floor slab is wide.

According to the second aspect of the invention, the receiving member has an L-shaped cross section having a vertical plate portion and a horizontal plate portion, and the play closing member is formed of rubber or sponge and faces each other. Since it is inserted in a compressed state between the vertical plate portions and received by the horizontal plate portion, it is easy to insert the play closing member, and a high sealing property is obtained.

According to the third aspect of the present invention, a step is formed at an end of a floor slab or an upper part of an abutment chest wall facing a floor slab of a road bridge and a floor is provided below the step. A receiving member protruding toward the center of the floor slab is fixed to the end surface of the floor slab or the abutment chest wall facing each other with the space between the slabs. The space between the floor slabs is closed by being inserted in a state of being compressed in the expansion and contraction direction and supported by the two receiving members, and the expansion joint is disposed above the space closing member, and the back of the expansion joint is post-punched. Since concrete was poured to the height of the road,
Even if the floor slab is wide, it is possible to prevent the expansion joint parts and concrete rubble from falling, and after the expansion joint is constructed, the blocking member of the expansion joint is prevented from dropping by the member to prolong the soundproofing and waterproof effect. Can be obtained over a period of time.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

<Structure of Road Bridge Joint> In the structure of the road bridge joint according to the present invention shown in FIG. 1, reference numeral 1 denotes a reinforced concrete floor slab, and 2 denotes a floor constituted by end faces of the opposing floor slabs 1, 1. An expansion joint 4 for closing the slab 3 and an expansion joint 4 constructed above the sluice 2 for smoothing traffic on the road surface while allowing expansion and contraction and other deformations due to temperature changes of the floor slabs 1 and 1. It is.

The expansion joint 4 has a pair of vertical plates 5 and 5 whose upper ends are substantially coincident with the road surface and are opposed to each other with a seam gap (joint gap) 7 smaller than the floor slab gap 3. And a rubber seal member 6 for connecting opposing inner surfaces of the plates 5 and 5 to each other. The vertical plates 5 are trapezoidal waves extending in the longitudinal direction of the seam while alternately bending from right to left, and the seam gaps 7 are also formed in a trapezoidal wave shape extending in the longitudinal direction of the joint while bending alternately, The rubber seal members 6 interposed in the wavy seam gap 7 also extend in the seam longitudinal direction while being alternately bent. The waveform of the vertical plate 5 may be an angular wave such as the trapezoidal wave or the triangular wave, or a gentle curved wave such as a sine wave.

An anchor 9 for firmly fixing the vertical plate 5 to the floor slab 1 is provided on the back surface of the vertical plate 5. Also, a bottom plate 1 is provided on the lower surface of the protrusion protruding to the other side of each vertical plate 5.
0 is fixed. Steps 11, 11 that are lower than the road surface are formed above the opposite ends of the floor slabs 1, 1, and the anchor 9 is disposed on the step 11. The back of each of the vertical plates 5, that is, the bottom plate 1
0 and on the step 11
Is installed to the height of the road surface and is connected to the floor slab 1. In FIG. 1, the backcast concrete 12 on one side is indicated by a two-dot chain line so that the configuration of the back of the vertical plate 5 can be understood. Reference numeral 13 denotes a pavement on the upper surface of the floor slab.

As shown in FIG. 2, the play closing member 2 has a rectangular cross section with a thickness of about 50 to 100 mm, is interposed in the play slab 3, and is attached to the end surfaces of the floor slabs 1 and 1. It is supported by fixed receiving members 14, 14.

That is, the receiving member 14 has a cross section L having a vertical plate portion 14a in contact with the end surface of the floor plate, and a horizontal plate portion 14b protruding from the lower end of the vertical plate portion 14a toward the center of the floor space 3. The vertical plate portion 14 is formed of a U-shaped steel material.
The surface facing the center of the floor slab play of a is formed flat.
A seal member (not shown) is interposed between the vertical plate portion 14a and the end surface of the floor slab.

The receiving member 14 is fixed to an anchor bolt 15 planted on the end face of the floor slab 1 and
The interval between the tips of 4b and 14b is narrower than the floor gap 3 and wider than the seam gap 7. The play closing material 2
Opposite receiving members 1 made of a rubber or synthetic resin sponge or rubber material having elasticity
Between the vertical plate portions 14a, 14a in the bridge length direction (floor 1
In the direction of expansion and contraction of the
b, 14b.

Therefore, according to the structure of the road bridge joint, the floor slab gap 3 is closed by the gap closing material 2, so that noise on the road such as vehicle running noise is transmitted to the bottom of the road bridge. 2 prevents. Also, even if rainwater or the like enters under the expansion joint 4 from the road surface, the rainwater or the like is prevented from leaking under the road bridge by the play closing member 2.

Further, since the play space closing member 2 is compressed in the bridge length direction, even if the floor space 3 becomes wide due to a temperature change, the floor space 3 is kept closed. . Further, even if the floor slab play 3 is greatly enlarged, the play occluding member 2 is supported by the horizontal plate portion 14b of the receiving member 14, so that it is prevented from falling under the road bridge.

<Method of Constructing Road Bridge Expansion Joint> A method of constructing the above expansion joint 4 will be described in the order of steps.

-Formation of Step 11- As shown in FIG. 3, a step lower than the road surface is provided above each of the ends of the floor slabs 1 and 1 opposed to each other with the floor slab 3 therebetween. 11 is formed. The step 11 can be formed by providing a formwork at the end of the floor slab when the concrete is laid on the bridge girder (so-called box-opening). Further, it can be formed by digging down the upper surface of the end portion after the floor slab 1 is formed.

-Fixing of the receiving member 14-A hole is made in each of the end faces of the floor slabs 1 facing each other below the step portion 11 with the floor slab 3 left therebetween, and the anchor bolt 15 is inserted into the hole. And the screw portion is projected from the end surface of the floor slab 1. A through-hole formed in the vertical plate portion 14a of the receiving member 14 in advance is fitted into the screw portion of the anchor bolt 15, and a nut is screwed into the screw portion, so that the vertical plate portion 14a is positioned at the end surface of the floor slab 1. Tighten.

The anchor bolts 15 can be implanted in the floor slab 1 in advance by attaching the anchor bolts 15 to the formwork when the box is removed.

-Construction of the play closing member 2-In this construction, for example, an insert 16 shown in FIG. 4 is used. The insert 16 has a gate-shaped (reverse concave) cross section extending in the longitudinal direction of a seam formed of a steel plate, and has the play closing member 2 compressed therein in a state compressed in the bridge length direction.

The upper plate portion of the insert 16 has a plurality of extrusion holes 1 for extruding the internal play plug 2 from below.
7 are formed at appropriate intervals. A plurality of handles 19 are provided on the upper surface of the upper plate at intervals in the seam longitudinal direction. The left and right side plates of the insert 16 are provided with a plurality of inserts 16 for avoiding interference with the anchor bolts 15 and nuts when the insert 16 is fitted between the vertical plates 14a, 14a of the receiving members 14, 14. Are formed at intervals corresponding to the intervals at which the anchor bolts 15 are arranged in the seam longitudinal direction. Note that the groove 20 does not necessarily need to be provided.

At the time of construction, the play closing member 2 is compressed in the bridge length direction, fitted into the insert 16 and inserted together with the insert 16 between the vertical plate portions 14b of the receiving members 14, 14. Then, a finger or a stick is inserted into the push-out hole 17 of the insertion tool 16 to insert the play closing member 2 from below the insertion tool 16.
While pushing between the vertical plate portions 14b, 14b.
Then, as shown in FIG. 5, the insertion tool 16 is pulled up, and the space between the vertical plate portions 14b, 14b, that is, the floor space 3 is closed by the space closing member 2. The upper surface of the play closing member 2 is made substantially the same height as the step portion 11.

-Pavement- A filler is packed on the floor closing member 2 and the steps 11 on both sides thereof up to the height of the floor slab, and the pavement 13 is continuously applied on the floor slab upper surface and the filler. . Thereafter, the pavement portion on the filler and the filler are removed (so-called retrofitting method).

-Installation of the expansion joint 4 and casting of the post-cast concrete 12-The expansion joint 4 is arranged above the play closing member 2, and the upper ends of the vertical plates 5 are raised to the road surface (upper surface of the pavement 13). The anchor 9 and the existing reinforcing bar of the floor slab 1 are connected in this state. Thereafter, post-cast concrete 12, 12 is cast on the back of the vertical plates 5, 5 to the height of the road surface.

Therefore, according to the above construction method, since the play closing member 2 serves as a filler for the continuous pavement, it is not necessary to separately close the floor play, and when the expansion joint 4 is installed. In addition, it is possible to prevent construction tools, rebars, and the like from falling under the road bridge by the play closing material.

<Other Examples of Free Space Closure Material> The free space closure material 2 shown in FIG. 6 has a rubber or synthetic resin sponge 2a having a rectangular cross section and its upper surface and side surfaces are covered with an elastic rubber film 2b. It is. In the case of the play closing member 2 as well, it is inserted in the play of the floor slab in a compressed state in the bridge length direction.

The idle closing member 2 shown in FIG. 7 has a rectangular cross section as a whole, and has a groove 21 extending in the longitudinal direction of the joint on each of the upper surface and the lower surface. Accordingly, the groove 21 enhances the compressibility when compressing the gap 2 and inserting it into the floor slab, and also enhances the elasticity of the gap 2 when the floor slab is enlarged or reduced.
Will increase by. The number of the grooves 21 may be one or plural.

In the receiving members 14 shown in FIG. 8, the leading edges of the horizontal plates 14b, 14b are formed in a wavy shape, and the protruding portion of one horizontal plate 14b is fitted into the concave portion of the other horizontal plate 14b. Are facing each other. That is, the horizontal plate portions 14b and 14b face each other with the gap 22 having a waveform. Therefore, even when it is necessary to increase the gap 22 as in the case of a long bridge, since the convex portions of the horizontal plate portions 14b, 14b are engaged with each other, it is possible to reliably support the play closing member, Further, when the play space of the floor slab is enlarged, a part of the play space closing material is prevented from dropping from the gap 22 between the horizontal plate portions 14b.

The receiving member 14 shown in FIG.
The fitting portion 2c that fits between the rising portion 14c and the vertical plate portion 14a protrudes from a side of the lower surface of the play closing member 2. Accordingly, since the both sides of the play closing member 2 are engaged with the receiving members 14, 14, when the floor slab is enlarged or reduced, the rising portions 14 c, 14 c are used.
14c is forcibly expanded and contracted, and both side surfaces of the play closing member 2 are longitudinal plate portions 14a, 14c.
Since the state of contact with a is maintained, it is advantageous in preventing a decrease in sealing performance due to deterioration of the play closing member 2.

Although the above embodiment is an example in which an expansion joint is constructed between the floor slabs 1 and 1, the expansion joint is constructed between the floor slab and the abutment according to the above embodiment. Can be installed on

[Brief description of the drawings]

FIG. 1 is a perspective view showing a partial cross section of a structure of a road bridge joint according to the present invention.

FIG. 2 is a sectional view of the same structure.

FIG. 3 is a cross-sectional view showing a state in which the play closing member according to the present invention is inserted into the play slab.

FIG. 4 is a perspective view showing an insert for the play closing member.

FIG. 5 is a cross-sectional view showing a state in which the play closing member according to the present invention is inserted in the play slab.

FIG. 6 is a sectional view showing another example of the play closing member according to the present invention.

FIG. 7 is a sectional view showing still another example of the play closing member according to the present invention.

FIG. 8 is a plan view showing another example of the receiving member according to the present invention.

FIG. 9 is a sectional view showing another example of the receiving member and the play closing member according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor slab 2 Play blocker 3 Floor slab 4 Expansion joint 7 Seam play 11 Step 12 Post-cast concrete 14 Receiving member 14a Vertical plate part 14b Horizontal plate part

Claims (3)

[Claims] 1. A structure of a seam portion of a road bridge in which an expansion joint for smoothing traffic on a road surface while allowing expansion and contraction of the road bridge is provided, wherein a floor slab is provided below the expansion joint. A receiving member protruding toward the center of the floor slab is fixed to each of the floor slab end faces facing each other, or to each of the floor slab end faces and the abutment chest wall surface facing each other with the floor slab. A structure of a road bridge joint portion, wherein a play closing material having elasticity is inserted between the floor slabs while being compressed in a direction in which the road bridge expands and contracts, and is supported by the receiving members. 2. The structure of a road bridge joint according to claim 1, wherein the receiving member has a vertical plate portion in contact with an end face of the floor slab or an abutment chest wall, and a floor slab from a lower end of the vertical plate portion. An L-shaped cross section having a horizontal plate portion protruding toward the center of the play, wherein the play closing member is formed of rubber or sponge, and has a bridge length direction between the opposed vertical plate portions of the receiving member. A road bridge joint portion, which is inserted in a compressed state and received by the horizontal plate portion. 3. A method of constructing a road bridge expansion joint for smoothing traffic on a road surface while allowing expansion and contraction of the road bridge, the method comprising: At each upper part, or at the upper part of each of the end parts of the floor slab and the abutment parapet opposed to each other with the floor slab, a stepped portion lower than the road surface is formed. Receiving members protruding toward the center of the floor slabs at each of the end faces of the floor slabs facing each other with a play, or at each of the floor slabs and the abutment chest wall facing each other with the play slabs. And fixing the space slab between the floor slabs in a compressed state in the direction of expansion and contraction of the road bridge, and inserting and supporting the both slabs to close the space between the slabs. Arrange the expansion joint above the material and place post-cast concrete on the back of the expansion joint. Method for constructing a highway bridge expansion joint, characterized in that the pouring to Mendaka of.