JPH0235082B2 - KYORYOYOSHINSHUKUTSUGITENOSEKOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing a telescoping joint provided between the ends of the main girder of a bridge, particularly an elevated road bridge.

[Conventional technology]

In the very early expansion joints of this type, as shown in Figure 7, the gap between the face plates 2, 2 was reduced by providing drainage gutters 1, 1 inside the connection between the main girders AA of the bridge. Measures were taken to drain out rainwater, etc. that flowed in, and thereby prevent rusting. However, over time, dirt and dust build up in the drainage gutter, rendering it completely useless.On the contrary, the water overflowing from the gutter causes corrosion in the supporting parts and damage to the bridge abutments. In addition, due to the difference in level between the top surface of the face plate and the connecting pavement surface and the gap between the face plates, large noises from vehicles are generated.
It was also causing environmental pollution.

Therefore, conventionally, the face plate 2 as described above,
In the space surrounded by 2 and web plates 3, 3,
For example, as shown in FIG. 8, a back-up material 5 supported by supporting hardware 4, 4 is used as an underlay, and an elastic sealant 6 such as asphalt is filled, and a rubber waterproof sheet 7 is further placed on top of the elastic sealant 6, typically asphalt. There were products that had structures such as affixed materials.

Further, as shown in FIG. 9, a water stop material 8 having a cylindrical cavity 9 and sufficient self-repulsion elasticity is also used.
is compressed and fitted between the web plates 3, 3 in the Those that had the characteristic of keeping the side surface constant even when subjected to force from any direction were used.

[Problem that the invention seeks to solve]

However, in the case of the very early joint shown in FIG. 7, the above-mentioned problems have come to light, and repair work is now being widely carried out. For this repair, it is desired to develop a method for attaching a joint that reuses the drain gutters 1, 1 that have already been installed without having to remove them.

However, in the method of installing the joints shown in FIGS. 8 and 9, after the drain gutters 1, 1 are removed, the backup material 5, the elastic sealant 6, the rubber water-resistant sheet 7, and the water-stopping material are removed. In particular, the water stop material 8 shown in FIG. 9 has self-repulsion elasticity, making it even more difficult to insert it.

Therefore, the present invention provides a method that allows expansion joints to be installed only from the width direction of the bridge, without requiring construction from the road surface or under the bridge, regardless of the size of the gap between opposing bridges. The purpose is to

[Means to solve the problem]

The present invention solves the above problem by the following means.

First, in the first invention, a guide means is inserted from one end of the gap in the length direction to the other end of the gap between opposing bridges, etc., and the tube body is supported by the guide means, and The main part is to insert the tube through the end and inject fluid into the tube to expand the tube, thereby bringing the tube into close contact with an opposing bridge or the like.

In the first invention, the tube body is supported by connecting the tip of the tube body to the other end of the guide means, and the tube body is connected to one end of the gap by pulling out the guide means toward the other end of the gap. It was inserted from the end to the other end.

In addition, at that time, a stretchable elastic sheet with a length that is approximately equal to the length of the gap is placed in advance at an appropriate depth between one opposing bridge and the other bridge, and this stretchable elastic sheet is It is also preferable that the preceding guide member and the tube body are inserted above the tube.

The first invention is suitable for use when the width of the gap is narrow, and adds other requirements to the main part of the first invention, and provides a construction method that can be adopted when the width of the gap is wider. , the second invention provides. The second invention is to prepare a joint body including a frame body having a space portion that can change volume and have a small self-repulsion force, and a tube body that can be expanded and deformed to be inserted into the space portion, and The joint is placed on a guide means such as a string, a rope, or a rod and passed between the gaps between the bridges, and a fluid is injected into the tube body to expand the tube body and reduce the volume of the space in the frame body. The present invention provides a construction method for an expansion joint for a bridge, which is characterized in that by enlarging the joint body, both sides of the joint body are brought into close contact with the opposing bridge.

Here, the space with a small self-repulsion force refers to a space where the self-repulsion force is zero or has a repulsion force that does not cause large resistance when the joint body is inserted into the clearance.

This space may be any space that allows a tube to be inserted into it, and is not limited to a hollow cylindrical space whose top, bottom, left, and right sides are sealed, but may also be an open space with only a skeleton or a net. It may also be an amorphous space formed by a sheet or a tube.
In addition, the cross-sectional shape of this space can be cardinal, circular, or
It can be modified into various shapes such as a polygon.

Further, as the tube body in the first and second inventions, in addition to an elastic tube body having elasticity, it is also possible to use an inelastic tube body.

[Effect]

In the first invention, the volume of the elastic tube body is inserted into the small gap in a contracted state, and a fluid is injected into the elastic tube body to increase the volume of the elastic tube, so that the elastic tube body is inserted into the gap. It is attached.

In the second invention, the joint body is inserted into the gap between the bridges without resistance while the volume of the space is reduced, and then a fluid is injected into the elastic tube body to increase the volume of the space. As a result, the joint body is attached with both sides of the joint body in close contact with the opposing bridge.

At this time, if at least one of the two sides of the space has an elastic body, the length between the two sides of the joint body can be changed even after the injection of the fluid is completed. Become.

〔Example〕

First, Figures 1a to 1c are explanatory diagrams relating to invention 1, and 11 is a diagram showing main girders A and A of a bridge.
The space in between is so narrow that you can hardly put your hands in it. First of all,
A leading guide member 12 made of suitable material such as wire, piano wire, or possibly a pipe made of vinyl chloride is inserted to an appropriate depth from one end to the other end in the length direction of this space 11 (FIG. 1a). . Next, an elastic tube body 13 which can be expanded and contracted is connected to the distal end of the leading guide member 12 by conventional means. Then, the leading guide member 12 is pulled out toward the other end of the play space. As a result, the elastic tube body 13 connected to the end of the leading guide member 12 is drawn from one end of the gap toward the other end, and is loaded across the length of the gap 11 (FIG. 1b). Next, a viscous fluid or the like is injected under sufficient pressure into the loaded elastic tube body 13 (FIG. 1c). However, the other end portions are completely sealed using water stop valves (not shown). After that, the fluid 14 is press-filled into the elastic tube body 13 so that the tube body 13 has a predetermined expansion pressure (arrow B).
This is successively continued until the gap 11 is strongly and tightly attached to the gap 11 in a sealed state. Thereafter, both ends of the elastic tube body 13 are tightened and closed, and the play space 11 is
The elastic tube body 13 is cut after being measured so as to be in close contact with the end point and the start point of the elastic tube body 13, and is formed into a suitable water-stopping material while it is already loaded in the gap 11.

Next, FIGS. 2a to 2c are explanatory diagrams relating to another embodiment of the first invention, which differs from the previous embodiment in that the stretchable elastic sheet is first disposed. different. That is, in the previous embodiment, the elastic tube body 1 was attached to the leading guide member 12.
By connecting and pulling 3, connect this to play area 1.
A work process is adopted in which the elastic tube body 13 is loaded along its length, and then a viscous fluid is injected under sufficient pressure into the loaded elastic tube body 13. However, in this case, a problem arises. This is because there is a certain limit to the tension of the leading guide member 12, and in cases where the gap is too long or where a viscoelastic material with a relatively heavy specific gravity is injected at once under pressure, The loaded elastic tube body has a considerable curvature at its center, which creates a pressure difference between the curved part and the other parts, which causes the filling to shift to one side, and sewage to this curved part. There is also the risk that the accumulation of soil, sand, and dust may cause early damage to the elastic tube body, which may pose a problem for young workers. Therefore, in this embodiment, this problem is also solved. In other words, Figure 2a
As shown in c to c, 15 is a stretchable elastic sheet disposed at an appropriate depth in the length direction of the play space 11,
The material is preferably the same as that of the elastic tube body 13 that will be filled later, but any material may be used as long as it is a sheet with particularly stretchable elastic properties. The order of this arrangement is the step shown at the beginning of the previous embodiment, and is already performed before the step of inserting the leading guide member 12 into the clearance 11. The state in which the elastic sheet 15 is arranged has a cross section of about V, which is convenient for receiving the elastic tube body 13 that will be loaded later in a bag shape.
It is the shape. In this way, the elastic sheet 15 is inserted into the gap 11.
After the gap is provided, the steps from b to c in FIG. 2 are carried out in the same working steps as in the previous embodiment. Finally, when the elastic tube body 13 is filled with a predetermined fluid 14 under pressure, the water stop method according to the present invention is completed. However, the original elastic sheet 15 has a bent portion 15' for locking on the upper surface of the gap.
is formed, the bent portion 15' is indicated by the arrow c,
By folding it back in the direction c, the elastic tube body 13 appearing at the opening of the gap can be further protected. Next, FIGS. 3 to 6 show an embodiment of the second invention. In this embodiment, first, as shown in FIG. The drain space 20 surrounded by the drain gutters 1, 1, face plates 2, 2, and web plates 3, 3 is recovered by removing it with water flow or the like. Note that, of course, this step is not necessary when a new joint is installed.

Next, insert the joint body into the gap. This joint body is
As shown in FIGS. 3 and 4, it includes a frame 21 and an elastic tube body 22 inserted into the frame 21. This frame body 21 includes a pair of upper and lower plate members 23, 23 that are rectangular in plan view, and the plate members 2
A pair of left and right holding members 24, 24 slidably attached between 3 and 23, and the holding members 24, 24.
A pair of elastic bodies 25, 25 sandwiched outside the sides of
and has. Two long holes 26 are formed in each of the upper and lower plate members in the width direction x of the frame body.

Here, as shown in Figure 6, generally the bridge is x
The gap between the ends of the bridge continues for a long time in the y direction. Therefore, in explaining the joint body (including the frame body) inserted into the gap, the width direction of the joint body (frame body), the width direction of the gap, and the length direction of the bridge are respectively referred to as the x direction, The length direction of the joint body (frame body), the length direction of the gap, and the width direction of the bridge are each defined as the y direction. Further, the left and right sides of the joint body (frame body) are the left and right sides when the joint body (frame body) is observed from the length direction, that is, the y direction.

The holding members 24, 24 have a substantially U-shape in the cross section in the x direction, and the upper and lower plate members 23, 2
It is sandwiched between 3. This clamping member 24,
Protrusions 27... having two locking mechanisms are provided on the upper and lower surfaces of 24, respectively, and the protrusions 27...
are fitted into the long holes 26 of the plate members 23, 23. Therefore, the holding members 24, 24 slide in the x direction relative to the plate members 23, 23 using the elongated holes 26 and the protrusions 27 as guides (see FIGS. 3 and 5).

Although the volume of the space 28 formed between the clamping members 24, 24 and the plate members 23, 23 changes due to the sliding of the clamping members 24, 24, there is no self-repulsion force and the space 28 is self-repulsive. The volume does not change due to the elastic force of. Note that the holding members 24, 24 and the plate members 23, 23 are manufactured from metal or hard synthetic resin.

The elastic tube body 22 is inserted into this space 28 in the y direction. This elastic tube body 22 has x
It is expandable and deformable with a large volume change in the direction, and has a length in the y direction that is approximately equal to the width of the bridge.

A pair of left and right elastic bodies 25, 25 are clamped and fixed to the clamping members 24, 24. The elastic body 25 has a horizontally long rectangular hollow cylindrical shape in a cross section along the x direction, and the side wall 29a inside the elastic body 25 and the vertical wall 30 of the holding member 24 have a corresponding uneven shape,
Both 24 and 25 are engaged with each other by this fitting of the concave and convex portions. The elastic body 25 is made of elastic synthetic resin, rubber, or the like, and its volume is reduced by external pressure and has a repulsive force corresponding to contraction. On the other hand, each outer side wall 29b of the elastic body 25 is
It has a plastic surface to improve adhesion to the web plate, which will be described later.

Note that the shape of the elastic body 25 may be one in which the cross section is formed into a continuous V-shape or inverted V-shape that repeats inwardly and alternately, like the water stop material 8 used in the joint shown in FIG. Furthermore, other shapes may also be used.

The joint body described above may have a length approximately equal to the width of the bridge, but the plate member 2
3, 23, clamping members 24, 24 and elastic body 25,
The frame body 21 consisting of 25 may be divided into small frame bodies 21' each having a width shorter than the width of the bridge.

The joint body thus formed is passed through the gap between the opposing bridges using a piano wire or wire rope guide. The material of the long and thin guide means such as string, rope, rod, and ball shape is selected depending on the weight, size, length, etc. of the joint body.
Greater strength is required when the guide means is used not only as a guide but also to permanently support the joint body.

In this embodiment, wire rope is used. The two wire ropes 31, 31 are passed through the center of the bridge gap 20 in the longitudinal direction (y direction) as shown by the dashed line in FIG. The distance between the wire ropes 31, 31 in the x direction is shorter than the width (length in the x direction) of the plate member 23, and the distance between the wire ropes 31, 31 and the face plates 2, 2
The length between the two is approximately equal to the height of the joint body. Both ends of the wire ropes 31, 31 are connected to a support plate 32 that is passed between the wave plates 3, 3 of the opposing bridge.
Fixed. The method of fixing the wire rope 31 is not limited to this, but may be fixed to a pair of opposing support plates extending from each wave plate, and many other methods may be employed.

Next, the joint body is placed on the two wire ropes 31, 31 and passed through the play space 10. Here, the joint body consists of a large number of small frame bodies 2, as shown in FIG.
1'... and one elastic tube body 22,
The small frames 21 are passed through the play space 20 while being sequentially joined. This joining is done before the play space 20, and after the joining is completed, it is passed through the play space 20. Adhesive, welding, etc. are used as the joining means. In this way, joining a plurality of short small frames 21' to form one frame 21' when inserted into the play space requires less construction time than when using one long frame. It helps to reduce space and labor. It should be noted that the elastic tube body 22 inserted into the frame body 21 can be easily deformed and bent, so it is not necessary to divide it into a plurality of parts, but it is of course possible to divide it into a plurality of parts. Finally, the fluid 33 is injected into the elastic tube of the completed joint body inserted into the play space 20. As the fluid 33, a material that does not change its fluidity or elasticity over time may be used, but mortar or the like that solidifies over time may also be used. If the width of the gap is large and the joint body does not have a large elastic force, the fluid 33 may be made of elastic resin or the like.

As the fluid 33 is injected, the elastic tube body 22 expands and the holding members 24, 24 slide to both sides, as shown in FIG.
The joint body is fixed between the opposing bridges in a state where the joint body 25 is in close contact with the wave plate 3 of the opposing main girder and is appropriately compressed. In addition, the wire rope 31,
31 permanently supports the joint body without being removed.

Even if the width of the gaps 20 and 11 changes due to changes in temperature, the bridge expansion joint constructed in this manner will not cause the flow to change if the fluid 33 itself injected into the elastic body 25 or the elastic tube body 22 has elasticity. body 3
The above change is absorbed by the elastic force of 3, and the upper part of the play space 20 can be closed in a stable state for a long period of time. In addition, as in this embodiment, the drainage gutter 1
When used in combination with the drain gutter 1, the joint body is not required to have a water-stopping effect so much as long as it can prevent earth and sand from accumulating in the drainage gutter 1.

〔Effect of the invention〕

As described above, the present invention allows expansion joints to be installed only by performing work from the side of the bridge, and provides an effective construction method for repair work of old bridges by installing drainage gutters. .

In the first invention, the viscous fluid or the like is pressurized and injected into the tube body already loaded into the gap, instead of directly filling and injecting it into the gap of an elastic seal such as asphalt. Therefore, even if there is a bulging deformation to improve the watertightness of the tube body, which becomes a so-called bag-like body, the viscous fluid that is the filling may blow out onto the gap, and the appearance of the area near the gap may be affected by this. There is no contamination and at the same time there is no gradual loss of sealing material. On the other hand, when pressurized injection of viscous fluid or the like into the tube body, the amount and pressure can be adjusted appropriately when filling the tube body, and therefore there is no conventional limit to the expansion elasticity of the tube body with respect to the gap. Peeling cracks such as those caused by hardening or aging of the elastic seal do not occur on the contact surface between the tube body and the gap.

In addition, the molded water stop material is inserted into the gap in a complicated compression and holding manner, and after being loaded into the gap, it expands due to its own repulsive elasticity, and the side of the water stop material that has been molded into a rigid shape as appropriate. It is not intended to closely contact the gap through the part and maintain the necessary watertightness there, and it does not have such self-repulsion elasticity, but it is sufficient for expanding and contracting bulge deformation. By adopting a method in which an elastic tube with an expansion characteristic of Even if there are differences in size and complexity such as bending in the length direction, it can be loaded without any problems, and the material that is then filled is a viscous fluid that is injected under pressure. etc., it is possible to fit in regardless of the shape and condition of the gap, and to ensure high watertightness at all locations within the gap.

In the second aspect of the invention, the tube body can be reliably protected by the frame body, and when the frame body is provided with elastic bodies on its sides, even if the width of the gap changes, the tube body can be reliably protected. It can absorb changes well and is effective when the gap width is large.

Further, when the frame body is divided into a plurality of members smaller than the width of the bridge, a large space is not required for construction, which is further advantageous for construction of bridges such as urban expressways.

Note that the present invention can be used not only for gaps between bridges but also for gaps between other structures such as concrete.

[Brief explanation of drawings]

Figures 1a to 1c are diagrams illustrating a narrow gap water stop method according to an embodiment of the present invention;
Figures a to c are diagrams illustrating a narrow gap water stop construction method as another embodiment of the first aspect of the present invention.
3 to 6 show an embodiment of the second invention, and FIG. 3 is a cross-section of the main part along the x direction in FIG. 6, which shows a state in which the elastic tube body of the joint body is not expanded. Figure 4 is a plan view of the joint body in Figure 1, Figure 5 is a sectional view of the main part showing the expanded state of the elastic tube body of the joint body in Figure 3, and Figure 6 is a plane view of the opposing bridge. 7 to 9 are sectional views of main parts showing a conventional joint structure. DESCRIPTION OF SYMBOLS 11, 20... Play space, 12... Leading guide member, 13, 22... Elastic tube body, 28... Space part, 31... Wire rope.

Claims (1)

[Claims] 1. A long guide means and a tube body whose tip is connected to the distal end of the guide means are prepared, and the guide is guided from one end to the other end in the length direction of a space between opposing bridges, etc. By inserting the means and pulling the guide means toward the other end of the gap, the tube body connected to the guide means is inserted from one end of the lengthwise direction of the gap to the other end, and the fluid is injected under pressure into the tube body. 1. A method of constructing an expansion joint for a bridge, characterized in that the tube body is brought into close contact with an opposing bridge, etc. by applying a predetermined expansion pressure. 2. The method for constructing an expansion joint for a bridge according to claim 1, wherein the guide means is a long, thin, and flexible material such as a piano wire. 3. A stretchable elastic sheet with a length approximately equal to the length of the gap is placed in advance at an appropriate depth between one opposing bridge and the other bridge, and above this stretchable elastic sheet, the guide means and A patent claim characterized in that a tube body is inserted, a fluid is injected under pressure into the tube body, and a predetermined swelling pressure is applied to the tube body so that the tube body is brought into close contact with the elastic sheet in a sealed state between the gaps. A method for constructing an expansion joint for a bridge according to item 1. 4. Prepare a joint body that includes a frame body that has a space that can change volume and has a small self-repulsion force, and a tube body that is inserted into the space, and adjust the longitudinal direction of the gap between opposing bridges, etc. A long guide means is stretched from one end to the other end, and with the joint body placed on the stretched guide means, the joint body is inserted into the gap, and a fluid is injected into the tube body. 1. A construction method for an expansion joint for a bridge, characterized in that the tube body is expanded by expanding the volume of the space in the frame body, thereby bringing both sides of the joint body into close contact with the opposing bridge. 5. The method for constructing an expansion joint for a bridge according to claim 4, wherein the frame is provided with an elastic body on at least one side of both sides of the space. . 6 The frame includes a pair of upper and lower plate members and a clamping member slidably attached to both left and right sides between the plate members, and a space is formed by the space between the left and right clamping members and the upper and lower plates. 6. The method of constructing an expansion joint for a bridge according to claim 5, wherein a part of the elastic body is clamped on the outside of the side of the clamping member. 7. A gap between the bridges is formed between the lower surfaces of a pair of face plates that mesh with each other via comb teeth aligned in the width direction of the bridge, and a pair of web plates that face each other along and across the meshing portions. 7. The method for constructing an expansion joint for a bridge according to any one of claims 4 to 6, wherein the space is 8. The guide means is a plurality of rope-like members, and the plurality of rope-like members are stretched in the longitudinal direction of the play space, and the joint body is placed on top of these rope-like members and slid. 8. The method for constructing an expansion joint for a bridge according to any one of claims 4 to 7, wherein the expansion joint is passed through a gap between the bridges. 9. The method of constructing an expansion joint for a bridge according to claim 8, wherein the rope-like member is fixed to the bridge with the joint body placed thereon. 10 Claims characterized in that the frame is divided into a plurality of members smaller than the width of the bridge, and each member of the frame is sequentially joined and passed through gaps in the bridge. The method for constructing an expansion joint for a bridge according to any one of items 4 to 9.