KR20010044690A - Anti-Scouring and Erosion Fabric Form for Bridge - Google Patents

Abstract

PURPOSE: A fabric form repairing the local scour and preventing the erosion of a bridge and a construction method of the fabric form are provided to prevent the scour and to repair by using a fabric form while concrete mortar, sand and soil are poured into the inside of the fabric form. CONSTITUTION: A construction method comprises three steps. In the first step, a fabric form(1) for repairing scoured parts is placed in a scour area around an underwater structure such as a pier(22), a pier base, and etc. In the second step, un-solidified mortar or sand and soil are poured into an injection port(12) of the fabric form. In the third step, a fabric concrete bag is formed by the poured materials.

Description

Bridge scour repair and erosion prevention fiber band and construction method {Anti-Scouring and Erosion Fabric Form for Bridge}

Field of invention

The present invention relates to a construction method using a fabric form (Fabric Form) to prevent soil scour, such as bridge piers, alternating foundations. More specifically, the present invention by using the civil fiber band for the purpose of preventing and repairing the sewage of the soil, such as bridge piers, alternating foundation, by injecting the solid concrete or mortar of the flow state or sand, soil, etc. The present invention relates to a method for repairing or scouring pier and piling of pier and foundation.

Background of the Invention

Soils are scoured or eroded by bridges and bridges around rivers caused by heavy rain and heavy rainfall every year, causing adverse effects on structures. Therefore, the construction to repair the structure of the underwater due to the soil scour or to prevent the soil scour in advance.

Up to now, it has been used as a scourer to fill the soil where the soil is lost or install concrete blocks. However, these conventional methods suffer from many problems from various viewpoints. In the case of the method of filling the stone, it is difficult to secure the proper size of the stone, causing the destruction of the environment due to the development of the stone, and the loss of the stone installed during the flood. In the case of the concrete block installation method, due to its own shape of the large concrete block does not completely protect the bend of the lower bed around the bridge foundation, it takes a lot of equipment, manpower and period for the concrete block installation.

Therefore, the present inventors have developed a new method that solves the above problems in repairing and preventing soil scour occurring in bridges and shifts of various bridges, and this new method is economically and technically very advantageous. It is expected to be used a lot later in the construction period and workability due to its excellent construction method.

It is an object of the present invention to inject stiff concrete, mortar or sand or soil in the field between fabric formwork made of high-strength geotextiles to provide scour repair and erosion prevention structures around bridge piers and shift foundations. It is intended to provide a construction method that is most suitable for on-site construction of indeterminate by forming on-site as well as onshore and directly under water.

Another object of the present invention is to use a fabric form made of high-strength geo-fiber fabric in the field as well as on land as well as construction on the site directly because it does not need to manufacture or transport concrete ingots in a short time economic cost To provide a way to do it.

Another object of the present invention is to provide a construction method that can be applied to any type of pier, scour repair around the foundation and prevent scrubbing work to manufacture geosynthetic formwork according to the required design weight and scoured shape. .

Still another object of the present invention is to provide a construction method in which the scour repair and the scour prevention fiber large holes are integrally formed and there is no fear of loss and almost no defect occurs.

Still another object of the present invention is to provide a simple and efficient construction method by injecting solid concrete, mortar or sand, earth and sand in the state of flow between fabric formwork made of high-strength geotextile. .

The above and other objects of the present invention can be achieved by the present invention described in detail below.

1 is a schematic cross-sectional view showing a state in which a scour-repairing fiber large hole of the present invention is constructed in a bridge foundation.

FIG. 2 is a cross-sectional view schematically showing a state in which a scour-resistant fiber large hole is installed on the bridge foundation to prevent sedimentary scour after construction of the scour-repairing fiber large hole of the present invention.

FIG. 3 is a perspective view schematically illustrating various types of anti- scour fibrous pores of FIG. 2.

4 is a cross-sectional view schematically showing a state in which the broken portion in the lower portion of the pier is constructed by the repair structure fiber fabric hole of the present invention.

5 is a view schematically showing the construction using a civil engineering fiber band to repair and prevent earth and sand scour such as bridge piers, shift foundations according to the present invention.

FIG. 6 is a schematic diagram for preparing a specimen for testing compressive strength in an embodiment of the present invention.

7 is a graph showing the compressive strength measured for the specimen prepared in the embodiment of the present invention.

* Brief description of the major symbols *

1: Scour repair fiber stand 2: Hand structure repair fiber stand

4: anti-washing fiber band 5: flexible fiber band

12: injection hole 13: rebar

14: injection hose 15: zipper

16: damaged portion 21: foundation

22: pier 23: water level

24: concrete structure 26: fixed pile

27: pontoon 28: ready-mixed concrete (sand pump) pants

29: tank

Construction method using geosynthetic fiber band for scour and erosion prevention according to the present invention is to install the scour repair fiber band in the soil scour area around the piers, bridge piers, alternating, injection raw material through the injection hole provided in the scour repair fiber And filling the sand, earth and sand and concrete according to the injected raw material, and filling the sand, earth and sand, and hardening the fiber and the mortar into the fiber into which the mortar and the mortar are filled.

In another aspect of the present invention, the construction method when the concrete piers or bridge foundations, etc. of the bridge using the water-absorbing fabric jacket (Fabric Jacket) is corroded or damaged by water flow, the concrete bridge piers, concrete piers foundation, etc. Assemble and install reinforcing bars around the reinforcement, and install a fabric repair fabric (fabric jacket) on the outer side of the reinforcement, injecting concrete or mortar through the injection hole provided in the hand structure repair fiber, It consists of curing the injected concrete or mortar to form a repair fiber large hole. And optionally the fabric repair fabric fabric (Fabric Jacket) is zippered to facilitate assembly.

Fabric Form is a formwork made of high-strength geosynthetic fiber. It is a large-sized sandblast, concrete or concrete suitable for direct use on site by injecting solid concrete, mortar or sand or soil in the field. Mats can be formed, and are classified as follows according to their use.

The construction method according to the present invention does not need to be manufactured and transported separately by directly installing on-site as well as on land, and it is a suitable construction method for home construction of irregular type. The present inventors have already received a patent for this fiber band and various construction methods using the same (Patent registration No. 119332) or is in a pending state (Patent applications 98-34388, 98-34020, and 98-34021). , 98-42515).

Fibrous band revetment has been using traditional type (凹凸 type) at first, but the thickness (minimum thickness of 7cm) was insufficient, causing cracks and scouring of earth and sand through the lower part of rods and barley. In addition, the parts other than rods do not adhere to the soil and have a small ground area (28%), which is unstable to the activity. Therefore, the zigzag-type fiber band revetment ball was developed by improving this, and the safety safety rate was greatly increased (68% of grounding rate). It has been welcomed by improvements and improvements in many ways, including prevention.

Recently, the applicant has developed an environmental type (grass type, fish and shellfish type), a cut slope reinforcing fiber band (Green Slope), a sand fiber band (Sand Form), and the like. This led to development. The method of the present invention is considered to be widely used as various scour prevention balls in the future, and is considered to be a high level of economic and technical method.

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

1 is a view schematically showing a state in which the scour-repairing fiber large hole of the present invention is constructed in a bridge foundation. The construction method according to the present invention using a fiber band is to produce a geosynthetic fiber according to the site conditions and shape to install the scour repair fiber band (1) around the water. Then, the injection raw material is filled by injecting the fiber band 1 through the injection hole 12 using a high pressure pump (not shown) or a sand pump. The injection raw material is used to select the appropriate according to the conditions of the site, it is generally selected from concrete, mortar, sand or earth and sand. By curing the filled concrete or mortar to complete the scour repair fiber large hole.

2 is a view showing a state in which the anti-washing fiber hole is installed on the foundation of the bridge to prevent the earth and earth scour after the construction of the scour-repair fiber hole of the present invention, the anti-washing fiber hole (4, 5) is It is to prevent additional scour and scour, after installing the scour repair fiber band (1) to prevent earth and sand scour around the piers, alternating foundations and piers around the construction as described in the construction described above. To form fibrous pores;

The fiber band used as the anti-washing fiber band 5 is a zigzag-improved fiber band (A) used when a concrete mat requiring a drain hole is used as the fiber band with a filter as shown in FIG. , No-filter type, which is used in the case of no need of drainage hole (no positive pressure part), used to form side-by-side concrete tube in the form of order-type fiber band (B) and tubular form. Flexible fiber band 5 is used to form a separate flexible fiber large hole at the end of the mesh fiber band C and the main body fiber band 4 to suppress the progress of earth and sand scour.

4 is a view schematically showing a state in which the broken portion in the lower portion of the piers are constructed with the repair structure fabric fiber hole of the present invention. This construction is performed when the concrete pier, bridge foundation, etc. of the bridge is corroded or damaged by water flow. The construction method is to reinforce the concrete pier 24 of the bridge or around the damaged part of the bridge for construction. Assemble the reinforcing bar (13). Thereafter, the formwork using the fiber band on the outer side of the reinforcing bars, that is, to manufacture the structure of the fiber structure (2) and place on the site. After sealing the zipper 15 is filled by filling the concrete through the injection hose 14 based on the diver in the water. And hardening the injected concrete or mortar.

5 is a schematic view showing the construction using a geosynthetic fiber band to repair and prevent earth and sand scour around the piers, alternating foundations according to the present invention. The anchor 26 is installed on the river or the sea to ship the fiber band fabric and various miscellaneous materials while the pontoon 27 is fixed to the surface of the water. In addition, the fabric is placed on the construction site by mounting a bar (28) equipped with various raw materials required for fabric laying, and then filling the injection material with a fabric concrete bag (Fabric concrete bag) around the piers (22). Complete (1). In addition, by laying the scour prevention fiber band on the upper surface of the scour repair, and curing by injecting concrete or mortar through the injection hole is a fiber form concrete mat (Fabric Form Concrete Mat) (4, 5) is completed.

For more precise construction, the preliminary survey of the scour site through the diver can be carried out before the construction to investigate the area, depth and surface condition of the scour site to determine the size of the scour repair fiber surface and to determine the construction area. .

The bars are equipped with two concrete or mortar pumps (including one spare), ready-mixed concrete trucks, sand pumps, and the like, and are allowed to stand on site. The concrete pump hose is inserted into the installed fabric to inject concrete, mortar or sand through the inlet 12 to inject and pour in the scour repair fiber air hole and the scour prevention fiber air hole. In addition, if necessary, the tow is put into the field as a towing ship to tow and fix the bar.

Fiber large pores of the present invention made as described in detail in the specific example above is selected by applying the method of calculating the weight of the coating stone Hudson (Hudson) formula below.

Where W = minimum tonne of concrete or sandblast

ξ = unit volume weight of concrete or sandbag (ton / m ³ )

η = unit volume weight of water (or seawater) (ton / m ³ )

α = angle between the slope and the horizontal plane (degrees)

ρ = integer determined by the properties of the cladding

H = wave height of traveling wave at slope position (m)

The coating stone weight calculation method quoted above was demonstrated as a preferable specific example of this invention, This invention is not limited to this. For example, the method of calculating the weight of the coated stone is different from that in the case of rivers, and a more suitable method may be adopted according to the results of academic research.

Fiber band fabric is a fabric of zigzag improved fiber band and lanyard construction method that uses the revetment which supplements the shortcomings of conventional fiber band.

The standards listed below are the minimum specifications, and the materials and types of fabrics are changed and used from time to time according to the site conditions and uses.

In addition, the selection and mixing of the injection material is used in the following Table 3 as a standard, and if the ready-mixed concrete is used, it is used only when the ready-mixed concrete supply is not delayed for more than 30 minutes. And during construction, adjust W (water) / C (cement) to the site. In addition, the injection material is appropriately selected according to the site conditions, but the injection material is not necessarily selected because it is limited to concrete or mortar. For example, depending on site conditions, the injection material may use sand, soil, and the like.

division Kinds Flow value W / C ratio Water (W) Cement (C) Aggregate Aggregate (S) Admixture Remarks Morter 1: 2 20 ± 2 cm 60 to 65% 360-390 kg 600 kg Appropriate amount㎥ Glidants Morter 1: 3 20 ± 2 cm 60 to 65% 330-357.5 kg 550 kg Appropriate amount㎥ Glidants concrete 25 10 According to specification sand Changed according to site conditions

＊ W / C should be changed according to site conditions such as sand moisture content, weather, site condition and slope.

Example

6 is a schematic drawing of a specimen for testing the compressive strength of a fiber band tube used in the present invention. A fabric form tube 150 mm or 200 mm in diameter and 1,500 mm in length is produced and suspended in a water tank 29 containing water. Then, the concrete or mortar is injected into the fibrous band tube and then flows to form a mold. After 15 minutes have passed, the specimen 30 is made from the fabric form tube according to the mortar strength test specimen manufacturing method and subjected to the compressive strength test. The compressive strength increase rate is given by the following equation. The test strength at this time is less than the actual strength at the site. This is because the pressure is applied less than the field and the cause is due to the bibim.

7 is a graph measuring the compressive strength with the specimen prepared as described above. Fabric form revetment ball is a special formwork that discharges excess water of mortar by injection pressure to reduce water and cement ratio, resulting in increased compressive strength, excellent durability, and high strength hardened concrete. I can see. The mixing ratio of mortar used here is cement: fine aggregate = 1: 2, water / cement = 60%, standard curing specimen length is 10cm.

According to the present invention, the scour repair and the scour prevention fiber large hole are integrally formed and there is no fear of loss, and construction can be performed in a state where almost no defects occur, and between fabric dies made of high-strength geotextiles. Injecting unconsolidated concrete, mortar, sand, or soil in the pump into the pump allows easy and efficient construction. In addition, scour repair and scour prevention concrete mats are formed by using fiber bands around piers, alternating foundations, or various hand-made structures, so that they can be installed on-site as well as on land. You can do it at the same time.

Simple modifications and variations of the present invention can be readily used by those skilled in the art, and all such variations or modifications can be considered to be included within the scope of the present invention.

Claims (5)

Laying scour repair fiber bands in the soil scour areas around various underwater structures such as bridge piers, bridge foundations, and perimeters; Injecting the raw material through the injection hole provided in the scour repair fiber band; And Forming a fiber bag according to the injected raw material; Construction method comprising the steps. The method according to claim 1, further comprising the step of forming a fibrous antipore through the step of forming the fibrous bag and curing the fibrous bag with concrete or mortar on the fibrous bag. The method of claim 1, wherein the injection raw material is selected from the group consisting of concrete, mortar, earth and sand or sand. Assembling and installing reinforcing bars around the concrete pier, concrete pier foundation, etc. of the bridge; Installing a fabric repair fabric fabric fabric fabric outside of the reinforcing bar; Injecting concrete or mortar through an injection hole provided in the manual structure repair fiber band; And Curing the injected concrete or mortar to form repair fiber pores; The construction method comprising the steps of repairing the damaged parts of the concrete corroded or damaged by the water flow of the bridge pier, concrete pile, etc. 5. The method of claim 4, wherein the manual structure repair fiber band is formed by attaching a zipper to facilitate assembly.