KR100470434B1 - The repair and reinforcement method for a foundation of a bridge - Google Patents

Abstract

The present invention relates to the repair and reinforcement method of the bridge, in particular to the application of the reinforcement steel pipe pile direct reinforcement method, even in bridges with a low geometry space of the lower part of the bridge, around the lower foundation of the alternating bridges or piers After driving the reinforcing steel pipe pile, anchor the anchor body to the existing lower foundation, and then reinforce the steel to connect with the reinforcing steel pipe pile, and install the formwork to install the reinforcing concrete to replace the bridge or bridge of the bridge with limited space. There is a characteristic to improve the bearing capacity.

The present invention is composed of five steps, but even in the low bridge space of the lower bridge space, install the striking 30 to effectively drive the reinforcing steel pipe pile 40 through the drop hammer 31, repair and reinforcement General preparation process (S1) of preparing a material, reinforcement steel pipe pile driving process (S2) which drives the reinforcement steel pipe pile 40 around the lower base 20 using the said driving machine 30, and the lower base 20 ) An anchor body 21 is installed on an outer circumferential surface of the reinforcing bar reinforcing step S3 for connecting the reinforcing steel pipe pile 40 and the reinforcing bar 22 and the reinforcing steel pipe pile 40 connected to the reinforcing bar 22. Installing the formwork along the outside, the concrete placing process (S4) to form the expansion portion 23 by pouring concrete, and curing and cleaning process to remove the formwork after completely curing the expansion portion 23 ( S5).

As described above, the present invention, after driving the reinforcing steel pipe pile around the lower foundation of the bridge or the lower bridge of the bridge with low geometry space requiring repair and reinforcement, anchor the reinforcement to the existing lower foundation, then install the formwork By integrating reinforcement concrete, there is an effect of improving the bearing capacity of the shift or the piers.

In particular, even in bridges with low geometry space, the reinforcement of the reinforcing steel pipe piles is possible, so that the perfect repair and reinforcement of the 2nd and 3rd bridges, which have relatively low bearing capacity of the lower foundation, can be achieved. There is another effect of preventing it at the source.

In addition, unlike the conventional repair and reinforcement method, even if the lower foundation of the bridge or bridge is enlarged due to the reinforcement concrete reinforcement, the vertical load is not increased by the bearing force of the reinforcing steel pipe pile, and the weight and the upper material of the existing lower foundation are increased. Another effect is that the load is distributed to the newly driven reinforcing steel pipe piles to provide a more stable reinforcement.

Description

{The repair and reinforcement method for a foundation of a bridge}

The present invention relates to the repair and reinforcement method of the bridge, more specifically, to be applied to the reinforcement steel pipe pile direct reinforcement method even in a bridge with a low geometry space of the lower part of the bridge, the replacement or bridge of the aging bridge The present invention relates to a lower foundation repair and reinforcement method for a bridge having a limited space for driving a reinforcing steel pipe pile around a lower foundation of the bridge, connecting the existing lower foundation with reinforcing bars, and then pouring concrete to integrate it.

In general, the alternating foundations of reinforced concrete bridges or lower foundations of bridge piers are subject to aging due to a variety of causes over long periods of use. Looking at the causes, scour due to external friction and continuous friction caused by high flow velocity The main causes can be the loss of bearing capacity of the lower base, destruction due to natural disasters, corrosion of concrete due to water pollution and neutralization, and defects due to poor construction, etc. You are in danger.

In order to reinforce the damaged lower foundation of the alternating pier or pier as shown in Figures 1a and 1b, the anchor body 21 is anchored to the existing lower foundation 20, and the steel or FRP formwork is installed The reinforcement method was mainly performed to reinforce the reinforcing bar 22 and to cast concrete to form the extension 23.

Thus, the conventional foundation reinforcement method does not perform the original foundation reinforcement through the reinforcement of the lower pile or the well, but by simply reinforcing the damaged part or the reinforcement to the extent to improve the bearing capacity by extending the lower foundation, temporary reinforcement is possible, but the original Not only can phosphorus reinforcement not be achieved, but also the second base scour after reinforcement work or the lower foundation is revealed due to vortex phenomena during flooding, and as a result, the increase of self-weight by extension part and consequent risk of acceleration and collapse of bridge The problem was to add weight.

Accordingly, the present invention has been made in view of the above problems, and after the reinforcing steel pipe piles are driven around the lower foundation of the bridge or the lower bridge of the lower geometry space requiring repair and reinforcement, the anchor body is placed on the existing lower foundation. After anchoring, it is intended to improve the bearing capacity of the alternating or pier by installing a formwork and pouring reinforcement concrete to integrate it.

In particular, even in bridges with low geometry space, the reinforcement of the reinforcing steel pipe piles is possible, so that the perfect repair and reinforcement of the 2nd and 3rd bridges, which have relatively low bearing capacity of the lower foundation, can be achieved. It is aimed at preventing.

In addition, unlike the conventional repair and reinforcement method, even if the lower foundation of the alternating or bridge is enlarged due to the pouring of reinforcement concrete, the vertical load is not increased by the bearing force of the reinforced steel pipe pile to be reinforced, and the weight of the existing lower foundation and Another purpose is that the upper loading load is distributed to the newly driven steel pipe pile to be more stably reinforced.

In addition, in order to grasp the necessity and validity of the repair and reinforcement, the field load test is conducted, and after the repair and reinforcement is completed, the load test is conducted to compare the behavior of the bridges according to the vibration before and after repair and reinforcement. The purpose of this study is to make the verification effect of repair and reinforcement visible.

1a and 1b is the lower foundation repair and reinforcement method of the conventional bridge

2 is a process flow chart of the present invention.

Figure 3 is a side cross-sectional view showing a preparation process of the present invention.

Figure 4 is a side cross-sectional view showing a reinforcing steel pipe pile driving process of the present invention.

Figure 5a is a side cross-sectional view showing the reinforcement and concrete pouring process of the present invention

Figure 5b is a plan sectional view showing the reinforcement and concrete pouring process of the present invention

6A and 6B are cross-sectional views showing a second embodiment of the present invention.

7 is a flowchart illustrating a third embodiment of the present invention.

8A and 8B are cross-sectional views showing a third embodiment of the present invention.

[Explanation of symbols on the main parts of the drawings]

10 pier or alternating 11 superstructure 20 lower foundation

21: anchor 22: reinforcing bar 23: expansion

30: ride 31: drop hammer 32: boom

33: pulley 34: wire 35: guide

36: Drop Hammer Aid Reader 40: Reinforced Steel Pipe Files

41: cap 42: cushioning material 43: auxiliary leader

50: vibration sensor 51: wireless receiver 52: computer

S1: Preparation process S1 ': Field load test process

S2: Reinforcing steel pipe pile driving process S3: Reinforcement process

S4: Concrete pouring process S5: Curing and arranging process

S5 ': Verification process

The present invention relates to the repair and reinforcement method of the bridge, in particular to the application of the reinforcement steel pipe pile direct reinforcement method, even in bridges with a low geometry space of the lower part of the bridge, around the lower foundation of the alternating bridges or piers After driving the reinforcing steel pipe pile, anchor the anchor body to the existing lower foundation, and then reinforce the steel to connect with the reinforcing steel pipe pile, and install the formwork to install the reinforcing concrete to replace the bridge or bridge of the bridge with limited space. There is a characteristic to improve the bearing capacity.

The present invention is largely carried out in five stages, and even in a bridge with a low geometry space under the bridge, the piercing machine 30 may be installed and repaired to effectively drive the reinforcing steel pipe pile 40 through the drop hammer 31. General preparation step (S1) for preparing the reinforcing material, reinforcing steel pipe pile driving step (S2) for driving the reinforcing steel pipe pile 40 around the lower base 20 by using the driving machine 30, and the lower base ( 20) install the anchor body 21 on the outer circumferential surface, the reinforcing bar reinforcement step (S3) for connecting through the reinforcing steel pipe pile 40 and the reinforcing bar 22, and the reinforcing steel pipe pile (40) connected to the reinforcing bar 22 Installing the formwork along the outside of the concrete, the concrete pouring process (S4) to form the expansion portion 23, and after curing the expansion portion 23 completely, curing and cleaning process to remove the formwork It consists of S5.

Looking at the embodiment of the present invention through the drawings as follows.

Figure 2 shows the process flow chart of the present invention is composed of five processes as a whole, first look at the configuration to reinforce the pile lower foundation 20, the first step is a general preparation step (S1) as shown in Figure 3 In addition, the helm 30 is installed at a position where the helm 30 can be effectively driven by the drop hammer 31 even in the lower portion of the upper structure 11 having a low mold space, and the boom 32 is installed to be inclined to one side. A pulley 33 is installed at the end of the boom 32, and the drop hammer 31 is lifted by a wire 34 installed in the rider 30, and the guide 35 is at the end of the boom 32. Has a configuration in which it is placed vertically.

In order to install the guide 35, the trench is excavated below 60 cm of the underground reservoir GL, and then the guide 35 is inserted therein, and the reinforcing steel pipe pile 40 to be described below is driven from the bottom of the underground reservoir 60 cm. Configure it to be.

After the second step is performed, the reinforcing steel pipe pile 40 is placed through the guide 35 installed as the reinforcing steel pipe pile driving step (S2), and then the driving of the reinforcing steel pipe pile 40 is performed. As a minimum condition for maintaining the length between the lower end of the pulley 33 and the upper end of the drop hammer 31 is 110 cm or more so that the drop hammer 31 can be driven through the free fall after rising by the wire 34 It is configured to be.

On the other hand, the length of the reinforcing steel pipe pile 40 is composed of a length obtained by subtracting the length of the minimum hammer length and the drop hammer 31 from the length of the guide 35, the cap 41 to the upper end of the reinforcing steel pipe pile 40 ) And cushioning material 42 to protect the head of the reinforcing steel pipe pile 40, and serves to evenly transmit the striking force to the reinforcing steel pipe pile (40).

The reinforcing steel pipe pile 40 placed as described above is driven by the drop hammer 31, and the head of the reinforcing steel pipe pile 40 is driven to descend to a point of 15 cm above the underground reservoir, and then the driving is stopped. As shown in FIG. 4, another reinforcing steel pipe pile 40 is placed on top of the driven reinforcing steel pipe pile 40, welded to form a single body, and then the head of the connected reinforcing steel pipe pile 40 is continued. Repeatedly as described above until it reaches the stable ground, the reinforcing steel pipe pile 40 is configured to be firmly supported on the stable ground.

Reference numeral 36 in the drawing represents a drop hammer auxiliary leader, and 43 shows an auxiliary leader.

Then, the third step is the reinforcement step (S3), as shown in Figure 5a and 5b, by using the anchor body 21 on the outer peripheral surface of the pile lower foundation 20 of the existing piers or shifts 10 After anchoring, the reinforcing steel pipe pile 40 and the anchor body 21 are interconnected with reinforcing bars 22, and the reinforcing steel pipe 22 is also arranged between the reinforcing steel pipe piles 40 so as to be firmly coupled to each other.

After that, the fourth step is a concrete placing step (S4), after the formwork is installed along the periphery of the reinforcing steel pipe pile 40, concrete is poured into the formwork to form an extension 23 to form a lower foundation of the pile. (20) increases, and even if the pile lower foundation 20 is increased as described above, secondary scour occurs at the bottom of the pile lower foundation 20 by dispersing the vertical load by the bearing force of the reinforcing steel pipe pile 40. The pier or shift 10 is configured to not collapse.

The fifth process, which is the final process, is a curing and cleaning process (S5), after curing the poured extension part 23 to form a new pile lower foundation 20, removing the formwork and arranging various equipments of the present invention. Complete the process.

On the other hand, Figure 6a and 6b shows a second embodiment of the present invention, which shows the reinforcement of the bottom of the well bottom foundation 20, as shown, is similar to the reinforcement of the pile lower foundation 20 It is configured, the anchor body 21 is anchored to the lower base 20 of the well and the concrete is formed in a circular form to form the expansion portion 23 is different, but the overall configuration of the process proceeds in the same form Have

In addition, Figure 7 is a process flow chart showing another embodiment of the present invention, the pre- and post-treatment process is further added in the overall process of the first embodiment, the field load test step (S1 ') and verification step (S5') ) To further improve the reliability of the repair and reinforcement of the bridge, the contents are as follows.

First, the on-site load test step S1 ′ performed before the preparation step S1 is, as shown in FIG. After each of the vibration sensors 50 are installed in the vehicle, the amount of vibration generated by blocking the traffic of the vehicle and passing a moving load of a truck, for example, loaded with aggregate corresponding to the test weight ( Mm) is received through the wireless receiver 51 and recorded in the computer 52, analyzed by a computer program, and the state of the lower foundation 20 is visually observed to see if the lower foundation 20 collapses, Comprehensively grasp the degree of scour at the bottom of the lower foundation 20 to determine whether to repair and reinforcement.

Thereafter, even in a bridge with a low geometry space under the bridge, a preliminary preparation step of installing a stirrer 30 so as to effectively drive the reinforcing steel pipe pile 40 through the drop hammer 31, and preparing repair and reinforcing materials ( After completing S1), the reinforcing steel pipe pile driving process S2 is performed using the driving machine 30 to drive the reinforcing steel pipe pile 40 around the lower base 20.

Then, the anchor body 21 is installed on the outer circumferential surface of the lower base 20, and after completing the reinforcing bar reinforcement step S3 connecting through the reinforcing steel pipe pile 40 and the reinforcing bar 22, the reinforcing bar 22 The formwork is installed along the outside of the reinforcing steel pipe pile 40 connected to the), and the concrete is poured therein to form the expansion unit 23, and then the curing unit 23 is completely cured. After making it, the curing and rearranging process (S5) which removes a formwork is performed.

In addition, the verification step (S5 ') carried out after the curing and rearranging step (S5), as shown in Figure 8b, is carried out in the form similar to the field loading test step (S1'), pier or After installing the vibration sensor 50 on the upper fixed point of the shift 10 and the upper end of the lower foundation 20, respectively, the vibration generated by blocking the passage of the vehicle and passing the moving load with a constant load The amount is received through the wireless receiver 51 and recorded in the computer 52, and then the difference in vibration amount is analyzed by comparing with the result of the load test performed in the field load test step S1 'through a computer analysis program. Thereby verifying the repaired and enhanced effects.

In addition to the lower foundation 20 described above, if the lower pile is exposed due to severe scouring of the lower pile, a new newly established lower foundation 20 should be installed and reinforced in place of the lower pile, and in this case, the present method is effectively applied. You can do it.

As described above, the present invention, after driving the reinforcing steel pipe pile around the lower foundation of the bridge or the lower bridge of the bridge with low geometry space requiring repair and reinforcement, anchor the reinforcement to the existing lower foundation, then install the formwork By integrating reinforcement concrete, there is an effect of improving the bearing capacity of the shift or the piers.

In particular, in the case of bridges with low geometry space, the reinforcement of the reinforcing steel pipe piles is possible, so that the lower foundations of the 2nd and 3rd bridges, which have relatively low bearing capacity of the lower foundations, can be completely repaired and reinforced. Or another effect of preventing collapse inherently.

In addition, unlike the conventional repair and reinforcement method, even if the lower foundation of the alternating or bridge is enlarged due to the reinforcement concrete reinforcement, the vertical load is not increased by the bearing force of the reinforcing steel pipe pile, and the weight and the upper floor of the existing lower foundation Another effect is that the load is distributed to the newly driven reinforcing steel pipe piles to provide a more stable reinforcement.

In addition, in order to grasp the necessity and validity of the repair and reinforcement, the field load test is conducted, and after the repair and reinforcement is completed, the load test is conducted to compare the behavior of the bridges according to the vibration before and after repair and reinforcement. By analyzing, the verification effect of repair and reinforcement can be obtained visually.

Claims (2)

delete In the lower foundation repair and reinforcement method of the bridge, A very small amount of vibration generated by passing the moving load in the state where the upper fixing point of the bridge 10 and the vibration sensor 50 is installed on the upper end of the lower foundation 20 ( On-site load test step (S1 ') for receiving a record of a mm) through the wireless receiver 51 and recording it on the computer 52; A preliminary step (S1) of installing a stirrer 30 so that the reinforcing steel pipe pile 40 can be driven through the drop hammer 31 even in a bridge having a low geometry space under the bridge, and preparing a repair and reinforcing material; Reinforcing steel pipe pile driving process (S2) for driving the reinforcing steel pipe pile 40 around the lower base 20 by using the driving machine 30, Reinforcing bar reinforcement step (S3) for installing the anchor body 21 on the outer circumferential surface of the lower base 20, and connecting through the reinforcing steel pipe pile 40 and the reinforcing bar 22, Installing the formwork along the outside of the reinforcing steel pipe pile 40 connected to the reinforcing bar 22, and the concrete is poured into the concrete placing step (S4) to form an extension 23, After curing the expansion portion 23 completely, curing and cleaning step (S5) to remove the formwork, Vibration amount measured by measuring vibration amount in the same way as the field load test step (S1 ') and vibration amount of the field load test step (S1') by comparing and analyzing the computer program to visually check the stability of the reinforcement work. Consists of a verification process (S5 ') to verify, Diagnosing the necessity of repair and reinforcement, and visually verifying the stability of reinforcement works.