KR20060042491A - Backfill system of integral bridge and its construction method to minimize the backfill pressure and to prevent the approach slab from its settlement - Google Patents

Abstract

The present invention relates to an alternating backfill portion structure and a construction method thereof that can minimize back manual earth pressure in an integral shift bridge and prevent settlement of the connecting slab.

To this end, the alternating backfilling structure according to the present invention uses predetermined aggregates having a large particle size and poor particle size as the backfilling material. A compaction back filling portion which is constructed by compaction without using compaction equipment in width; Separation membrane for separating the road fill soil extending from the road fill soil construction when the compact backfill and the compact backfill portion construction; It characterized in that it comprises a transition portion having a low compaction degree formed in the section adjacent to the compacting backfill portion of the road fill soil to be extended construction.

Integrated Shift Bridge, Compact Backfill, Back Manual Earth Pressure, Connecting Slab, Drainage, Separator

Description

Backfill system of integral bridge and its construction method to minimize the backfill pressure and to prevent the approach slab from minimizing back manual earth pressure and preventing settlement of connecting slab in integral shift bridge its settlement}

1 is a cross-sectional view showing an example in which the compacting backfilling method according to the present invention is introduced into an integral shift bridge.

2a and 2b show an embodiment of the drainage means.

3A-3E are flow charts of an alternate backfill method in accordance with one embodiment of the present invention.

4 is a flow chart of an alternate backfill method according to another embodiment of the present invention.

5 is a cross-sectional view showing an example of an integral bridge.

Figure 6 is a cross-sectional view showing an example of applying the backfill method applied to the existing bridge bridge integral bridge.

<Code Description of Main Parts of Drawing>

10: backfill 12: compact backfill

14 separator 16: transition part

18: Road construction soil part 20: Drainage means

22: hollow tube 23: hole

24: U-shaped trench 25: Gravel or crushed stone

26 nonwoven fabric or perforated plate

The present invention relates to an alternating backfill portion structure and a construction method thereof that can minimize back manual earth pressure in an integral shift bridge and prevent settlement of the connecting slab.

Integrated bridges as shown in Figure 5 refers to a kind of jointless bridge (jointless bridge) to remove the expansion joint and the bridge support and to construct the superstructure and the shift integrally.

Such integrated shift bridges have advantages of low initial construction cost and maintenance cost, reduced impact load, good vehicle running, and convenient construction by removing new joints and bridge supports.

However, there is a problem that the integral shift bridge causes the displacement of the superstructure due to the change of the ambient temperature, and the back passive earth pressure generated by the shift displacement affects the structural behavior of the entire bridge as well as the shift.

That is, in the case of general joint bridges, since the superstructure and the substructure are separated by the bridge support, the main earth pressure is not transmitted to the superstructure, but in the case of the integral bridge bridge, the superstructure and the substructure are integrated. Due to the expansion of the superstructure according to the change of ambient temperature, the main earth pressure and the manual earth pressure can be generated on the alternating back surface respectively. In particular, the manual earth pressure is a much higher dynamic pressure than the main earth pressure. Do.

In addition, the back earth pressure in the integral bridge bridge not only affects the behavior of the shift and pile foundation, but also changes the cross-sectional strength of the superstructure because the upper and lower structures are restrained from each other. That is, as the size of the back soil pressure increases, the size of the parent moment occurring at the junction of the superstructure and the shift increases, which causes the cross-sectional increase of the superstructure, resulting in an increase in construction cost. Therefore, there is a need to minimize the back passive earth pressure in the construction of integrated shift bridges.

Figure 6 is a cross-sectional view showing an example of applying the backfill method applied to the existing bridge bridge integral bridge.

As shown, the existing backfill method is to construct the backfill portion 10 after the shift 30 and the road fill portion 18 independently, to secure the angle of repose of the road fill portion 18. The slope construction is performed.

And as a backfill material, the backfill part 10 adjacent to the shift 30 is not easy to use the compaction equipment when the backfill work is carried out after the shift structure is completed, and compared with the road fill part 18. Rapid compaction construction allows for 95% compaction, which is stronger than roadfill soil 18, where 90% compaction rules are applied using road sub-base materials (SB-1 or SB-2) with good particle size distribution to facilitate compaction. It is prescribed in the specification as much as possible.

Therefore, the conventional backfilling method requires a large amount of backfilling material due to the inclined construction of the road fill soil portion 18, and the length of the connecting slab 40 in contact with the backfilling portion 10 becomes long.

In addition, there is a difference in compaction degree between the road fill soil portion 18 that is compacted during the construction of the bridge and naturally compacted by the load of the construction vehicle, etc., and the back fill portion 10 rapidly formed, and thus the upper portion of the back fill portion 10. The connection slab 40, which is located at and supported by the back filling unit 10, is settled as the common time increases, and when the settlement of the connection slab 40 occurs, the impact is increased by the vehicle being driven. , The user's riding comfort is poor, there is a problem that must maintain the connection slab 40 continuously.

The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an alternating back fill portion structure and a construction method thereof that can minimize alternating back manual earth pressure.

It is also an object of the present invention to provide an alternating backfill portion structure and a construction method thereof that are easy to drain the backfill portion.

In addition, it is an object of the present invention to provide an alternating backfill structure and construction method that can reduce the length of the connection slab in contact with the backfill to prevent the settlement of the connection slab.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and the preferred embodiments.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a cross-sectional view showing the structure of the alternating backfill portion constructed by applying the compaction backfill method according to the present invention, the alternating backfill portion according to the present invention is the compaction backfill portion 12 and the transition portion 16 and It consists of the separator 14 which isolates these.

The alternating backfill portion refers to a space portion formed between the shifted construction 30 and the road fill portion 18, and the compacting backfill portion 12 is parallel to the shift axis on the alternating side 30 of the alternating backfill portion. Refers to the part where the backfill material is constructed by compacting without using compaction equipment with a predetermined width (for example, 1m or less).

The backfill material to be filled in the compaction backfill portion 12 can be easily obtained from a road auxiliary base material (for example, SB-1 or SB-2) produced in large quantities on the road site in consideration of commercial material supply and production. By changing the condition of sieving, we use materials with poor particle size that can be produced on the road site.

Table 1 below is the particle size criteria of the road auxiliary base material used as the backfill material (SB-1, SB-2) as the particle size standard of the backfill material (SB-3) applied to the compacting backfill portion 12 of the present invention As compared with the present invention, the backfill material applied to the present invention is basically a material excluding a small particle size aggregate that is capable of filling gaps in the gap while maximizing voids and possibly losing with water when water is introduced.

Granularity number Passing weight percentage (%) 75 mm 50 mm 40 mm 20 mm 10 mm No.4 No.8 No.10 No.40 No.200 SB-1 100 - 70-100 50-90 - 30-65 - 20-55 5-25 2-10 SB-2 - 100 80-100 55-100 - 30-70 - 20-55 5-30 2-10 SB-3 - 100 - - - 0 - - - -

Specifically, the backfill material passed 100% of the 50mm sieve at a weight percentage and had a particle size standard remaining in all No. 4 sieves. The reason is that the maximum particle size of 50mm used in concrete mixing is for securing agitation performance and constructability. The maximum aggregate particle size is 50mm, which means that there is no difficulty in agitation performance and selection in the uneven particle size distribution and in the field. Aggregate less than 4 is excluded because the particle diameter is less than 5mm and there is a great risk of loss with water when inflow water occurs in the alternating backfill.

Therefore, the backfill material (SB-3) according to the present invention is poor in particle size, it is possible to efficiently form voids of different shapes and sizes between the particles. In addition, the voids are filled with air, which plays an important role in the passage of liquid, that is, the influent, and has a direct and indirect function as a buffer space when the back passive earth pressure occurs.

On the other hand, if the particle size distribution is poor in structure, the internal friction angle is small, so the manual earth pressure coefficient is smaller than that of the existing material, and thus the back manual earth pressure is reduced and drainage is easy.

Such backfill material is filled in the compacted backfill portion 12 as it is or is produced by stacking the gabion 13 form.

Separation membrane 14 is a means for separating the compacted backfill 12 and the road-filled soil to be extended construction, facilitates the construction of the compacted backfill 12, and the soil filling of the road-filled soil to be extended construction It is installed to prevent the inflow into the back filling portion (12). The material may be any organic or inorganic material, as long as it can pass the groundwater while preventing the inflow of soil, and preferably non-woven fabric.

The transition part 16 refers to a section having a relatively low degree of compaction formed between the compaction backfill portion 12 and the road fill portion 18. The construction of the transition backfill portion 12 alternates with the construction 30. It is formed in the process of constructing the road fill section extending to the adjacent section, and is formed only in a portion (approximately 0.5 ~ 1m) adjacent to the compacting backfill 12.

On the other hand, the back-filling portion 10 may be further provided with a drainage means 20, the drainage means 20 refers to the groundwater drainage equipment is installed on the lower side of the alternate 30 of the back-filling portion (10).

When the drainage means 20 does not have good drainage of the backfill 10, the groundwater level is increased to increase earth pressure. Thus, the drainage means 20 has passed through a material using a material having a poor particle size as described above to smoothly drain the incoming groundwater. It is to prevent the rise of the groundwater level by easily draining the water.

2A and 2B show an embodiment of the drainage means 20. As shown in FIG. 2A, the hole tube 22 having a plurality of holes 23 formed only in the upper half end thereof, or as shown in FIG. 2B. Likewise, a U-shaped trench 24 filled with gravel or crushed stone 25 having a large particle and a uniform shape in the space may be applied. The cross section of the perforated tube 22 is preferably a circle or a square, but is not limited thereto. The shape of the hole 23 is also preferably circular, elliptical, square, triangular, rhombus, etc., but is not limited thereto. The opening of the U-shaped trench 24 may be provided with a nonwoven fabric or a perforated plate 26 as a means for preventing soil inflow.

Hereinafter, the construction method of the alternate backfill portion having the above-described structure will be described with reference to FIGS. 3A to 3E.

Alternate backfill portion construction method according to the present invention consists of drainage means installation step, separation membrane arrangement step, backfill material construction step, road fill soil compaction step and backfill part completion step.

Specifically, as shown in Figure 3a, first install the drainage means 20 at the lower end of the back-filling portion 10 adjacent to the shift 30 side (drainage means installation step), the pre-installed shift 30 After the separation membrane 14 is disposed on the backfill portion 10 between the road fill portion 18 (separation membrane arrangement step), a predetermined section (about 1 m from the alternating back surface 30 in the direction of the road fill portion 18). The backfill material according to the present invention is constructed with a certain height (about 30 cm) in the section). Backfill material is manufactured in the form of gabion 13 can be simply loaded (backfill material construction step).

Next, as shown in FIG. 3B, after the separation membrane 14 is set up, the road fill area which is constructed to extend to the same height as the construction height of the compaction backfill part 12 is filled and compacted (road fill part compacting step). In this case, the existing backfill material (SB-1, SB-2) is used for the road fill section to be extended, and the vibration-free compaction to prevent the impact on the shift in the case of the road fill section adjacent to the compact backfill section 12 ("A" part) and other parts are vibrated ("B" part). Therefore, the non-vibratory compaction portion ("A" portion) of the extended fill soil portion ("A" portion) is a transition portion having a difference between the compaction degree and the compaction road fill portion ("B" portion, 17) and the compaction backfill portion 12 ( 16), the vibratory compacted road fill section ("B" portion) becomes a road fill section 17 having the same compaction degree as the existing road fill section 18.

Next, as shown in Figures 3c to 3d by repeating the process of the backfill material construction and road fill compaction until reaching the planned height (after filling part completion step) construction of the backfill is completed.

When the construction of the alternating backfill is completed, as shown in FIG. 3E, when the connecting slab 40 is connected between the bottom slab 52 and the road 42 of the bridge, the construction of the bridge is completed. At this time, the expansion joint 44 between the connection slab 40 and the road part 42, and the slipper slab 46 is installed below the expansion joint 44.

In the present invention as described above, since the existing road fill portion 18 constructed at the time of shift construction is extended to a position close to the shift 30, the length of the connecting slab 40 in contact with the back filling portion is shortened. . That is, in the conventional case, since the backfill material was simply constructed in the backfill portion between the existing road fill part and the shift, which was constructed at the time of shift construction, the length of the connecting slab in contact with the backfill portion was long (see FIG. 6). . However, in the present invention, the length of the connecting slab 40 in contact with the back filling portion is shortened by extending the road fill soil to a position close to the shift.

In addition, in the conventional case, since the road fill site is constructed to have a tilt of 1: 1 at a position approximately 0.5 m away from the shift, the length of the back filling portion contacting the connecting slab is increased depending on the shift height, but in the present invention, the shift height is increased. Irrespective of the constant contact length can be obtained. There is also an effect that can reduce the amount of backfill material used.

On the other hand, in the case of using the backfill material manufactured in the form of gabion, the backfill material produced in the form of the gabion 13, as shown in Figure 4 to the construction of the back filling portion to the planned height and installed after the separation membrane 14 The road fills and fills the area. At this time, the existing backfill material (SB-1, SB-2) is used for the road fill site to be extended, and in the case of road fill compaction to be extended, the road fill section adjacent to the compaction back fill section 12 is shifted. Vibration-free compaction ("A" part) and vibration-free compaction ("B" part) are performed to prevent impact. Therefore, the vibration free compaction portion ("A" portion) becomes a vibratory compacted road fill portion ("B" portion, 17) and a transition portion 16 having a difference between the compaction backfill portion and the compaction degree. The portion ("B" portion) becomes the road fill portion 17 having the same compaction degree as the existing road fill portion 18.

As described above, according to the present invention, it is easy to drain the alternating back surface by using the aggregate having a poor particle size distribution that can be produced very easily from the auxiliary base production facility in the existing road site as a backfill material, so that the earth pressure by the water pressure due to the rapid inflow of groundwater Since there is no increase in and the passive earth pressure coefficient is small due to the characteristics of the material, it is possible to effectively reduce the back manual earth pressure of the integral shift bridge.

In addition, since the length of the filling backfill portion and the transition portion is much smaller than the length of the existing backfilling portion, the length of the connecting slab can be made smaller than that of the existing backfilling method, thereby preventing settlement of the connecting slab.

Although the present invention has been described in connection with the preferred embodiments mentioned above, various modifications and variations are possible without departing from the spirit and scope of the invention. That is, the above-mentioned embodiment has been described with respect to the case of applying to the integral bridge bridge, but the same effect can be seen when applied to the backfill of the general joint bridge. Thus, the claims will cover any modifications or variations that fall within the spirit of the invention.

Claims (13)

In the shift backfill structure of the integral shift bridge, Using the aggregate having a large particle size and poor particle size as the backfill material, parallel to the alternating axis on the side of the alternating backfill portion 10 formed between the alternating portion 30 and the road fill portion 18, which were previously constructed. A compaction back filling portion 12 that is constructed by compaction without using compaction equipment in a predetermined width; Separation membrane (14) for separating the road filling portion extending from the road fill portion (18) that was initially installed during the compacting back filling portion (12) and the compacting back filling portion (12) construction; Minimizing the back passive earth pressure and preventing settlement of the connecting slab, comprising: a transition portion 16 having a low compaction degree formed in a section adjacent to the compacted backfill portion 12 of the road-filled soil to be extended and constructed. Shift backfill structure for the. The method of claim 1, The backfill material passes 100% in a 50mm sieve at a percentage by weight, and has a particle size distribution that remains 100% in No. 4 sieves. Alternate backfill portions for minimizing back manual earth pressure and preventing settlement of the connecting slab . The method according to claim 1 or 2, The backfill material is alternately backfilled structure for minimizing the back passive earth pressure and preventing settlement of the connecting slab, characterized in that the gabion (13) form. The method of claim 3, wherein Alternating lower end of the back filling portion 12, the drainage means 20 is characterized in that the alternate back filling portion structure for minimizing the back passive earth pressure and preventing the settlement of the connection slab. The method of claim 4, wherein The drainage means 20 is a hollow tube 22, which is a hollow tube 22 having a plurality of holes 23 formed only at an upper half end thereof, and alternately back-filling for minimizing back manual earth pressure and preventing settlement of the connecting slab. Wealth structure. The method of claim 4, wherein The drainage means 20 is a U-shaped trench 24 filled with gravel or crushed stone 25 having a large and uniform shape in the space portion, minimizing the back passive earth pressure and preventing settlement of the connecting slab. Shift backfill structure. The method of claim 6, Alternate backfill portion structure for minimizing the back passive earth pressure and preventing settlement of the connecting slab, characterized in that the non-woven fabric 26 or the perforated plate is installed in the opening portion of the trench 24. In the construction method of the shift backfill portion of the integral shift bridge, A separation membrane arrangement step of disposing a separation membrane 14 at an alternating backfill portion between the shift 30 and the road fill portion 18; Construction of the backfill material with a large particle size and poor particle size at a certain height while laying the separator 14 at a predetermined height in the direction of the road fill soil 18 from the rear surface of the alternating material 30 A backfill material construction step of simply manufacturing the poor backfill material in the form of a gabion (13); After filling the road fillet which is extended to the same height as the construction height of the compaction backfill 12, and the roadfill site which is extended adjacent to the compaction backfill 12, the vibration-free compaction is made so as not to impact the shift. , And other parts of the road fill soil compaction step is extended to the compaction vibration; Alternate backfill construction for minimizing the back manual earth pressure and preventing settlement of the connecting slab, comprising the step of repeating the backfill construction step and the road fill site compaction step being extended to reach the planned height. Way. The method of claim 8, The backfill material is passed by 100% in a 50mm sieve at a weight percentage, and has a particle size distribution that remains 100% in No. 4 sieves, alternate backfill construction for minimizing the back manual earth pressure and preventing settlement of the connecting slab. Way. The method according to claim 8 or 9, Before disposing the separation membrane 14 further comprises the step of installing the drainage means for installing the drainage means 20 at the lower end of the back-filling portion adjacent to the alternating (30) side of minimizing the back passive earth pressure and the connection of the slab Alternate backfill construction method to prevent settlement. In the construction method of the shift backfill portion of the integral shift bridge, Constructing a backfill material having a large and poor particle size in the form of a gabion 13 between the backfill portion 18 and the road fill portion 18 to the backfill portion plan; Installing a separator (14); Fill the road fill section extending to a predetermined height, and in the case of the road fill section extending adjacent to the compacting backfill section 12, make a vibration-free compaction so as not to impact the shift 30, and the other parts Compacting the road fill soil to be extended construction; Alternate backfill portion construction method comprising the step of repeating the embankment, compaction and compaction of the road to be extended construction until reaching the planned height. The method of claim 11, The backfill material is passed by 100% in a 50mm sieve with a weight percentage, and has a particle size distribution that remains 100% in No. 4 sieves, alternate backfilling construction for minimizing the back manual earth pressure and preventing settlement of the connecting slab. Way. The method according to claim 11 or 12, Shifting for minimizing the back passive earth pressure and preventing settlement of the connection slab, further comprising the step of installing the drainage means 20 at the bottom of the back filling portion adjacent to the shift 30 side before installing the back filling material. Backfill construction method.

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