JP2920104B2 - Joint repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint repair method.

[0002]

2. Description of the Related Art Conventionally, box culverts have been used on many underground roads, overpasses, and the like. Here, the box culvert refers to a concrete body formed in a square tubular shape having a substantially rectangular cross section. And
A plurality of box culverts are arranged so as to connect the respective hollow portions, and the lower roads in the underpass and the grade separation are secured in the hollow portions.

[0003] By the way, concrete skeletons such as box culverts have the property of repeatedly expanding and contracting in a certain width due to temperature changes. In addition, each box culvert on an underpass or a road that crosses overpasses has a structural characteristic that a load or vibration caused by the passage of vehicles on the upper road, and furthermore, a behavior occurs when a stress such as an earthquake is applied. . Accordingly, joints having a constant width are provided between the box culverts adjacent to each other as a buffer space for expansion and contraction and behavior.

Further, since the upper part of the box culvert is the soil and the roadbed, it is easy for rainfall to penetrate between the joints from the slope of the roadbed in rainy weather. Therefore, between the joints, at the time of new construction, a waterproof plate made of synthetic rubber or the like, which is expected to have a water leakage preventing effect, is embedded as a joint.

[0005] However, joints in which the waterproof plate is used usually have cracks in 10 to 15 years due to various stress concentrations over a long period of time and deterioration of the weather resistance of the joint itself. Water leakage and the like cannot be prevented, which may hinder traffic. In addition, water leakage causes lime such as free lime to be generated, resulting in dirt, which impairs the aesthetic appearance of the concrete lining. Therefore, joint repair work is required to solve the problem.

Therefore, conventionally, when performing the above-mentioned repair work, a mortar injection method of removing joints at locations requiring repair and injecting mortar into joints between the box culverts from which the joints have been removed has been used. ing. This mortar injection method, as a big flow of the process,
The work proceeds in the order of preparatory work, hanging work, curing work, pouring work, sealing work, and removal work. The mortar injection method will be described below step by step.

[0007] Preparatory work: A worker who repairs a joint that needs repair can work easily and safely.
Assemble the scaffold on the underpass or on the lower road at the flyover.

[0008] Hanging: removing joints (water stoppage plates made of synthetic rubber or the like) that need to be repaired, and cleaning opposing surfaces of joints between box culverts. Curing work: In the mortar pouring work performed in the pouring work of the next process, since the mortar is poured at a predetermined pouring pressure so as to spread to each part, the mortar is made of steel as a formwork according to the joint between the box culverts. Alternatively, a resin panel or the like is fixed by jack-up or the like, and the pressure is cured.

Injector: Injects mortar at a predetermined injection pressure into joints between the box culverts which have been pressure-cured in the previous step. Then, after the mortar solidifies, the steel or resin panel is removed. Next, in the sealing work, a silicon-based caulking material is sealed from above the mortar on each joint to achieve a beautiful finish.

[0010] Removal work: Scaffolds are removed and the site is cleaned up. After the above steps, the joint is repaired.

[0011]

However, the mortar used for repairing the joint is not watertight, hard, and poor in flexibility. Therefore, the mortar cannot follow the expansion and contraction due to the temperature change of each box culvert and the behavior of each box culvert due to a load, vibration and the like. Therefore, if the expansion and contraction and behavior are repeated for a long period of time, cracks and voids are generated in the mortar in a relatively short period of time, and water leakage to the lower road in the underground passage or the like occurs again.

Further, mortar has a property that its volume is reduced by drying and curing shrinkage. For this reason, a space is generated between the joint using mortar and the roadbed, and when rainy weather, rainfall penetrates from the slope of the roadbed, concentrates on the joint as water leakage, and water flows due to water pressure or the like. Then, the soil of the roadbed is conveyed by the carrying action of the running water, and a larger space may be generated between the joint and the roadbed, and this space causes sinking and sinking of the roadbed.

[0013] Further, since the mortar requires a certain temperature when it is solidified, the temperature at the time of construction is related to the construction result. In addition, if it becomes rainy during the construction, the precipitation will penetrate from the slope of the roadbed and hinders the solidification of the mortar. Therefore, the selection of the construction process becomes complicated.

Further, in the mortar injection method, since the mortar is injected at a high pressure, the mortar must be cured under pressure in accordance with the joint of each box culvert. The work of fixing the steel or resin panel by jack-up or the like in the pressure-resistant curing is not easy for an operator and takes time. In addition, the construction process is prolonged, and the construction cost is increased and the surrounding traffic is hindered for a long time due to the construction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to provide a joint repair method having an extremely high effect of preventing water leakage after construction. A second object is to provide a joint repair method capable of reducing work costs during construction.

[0016]

In order to solve the above-mentioned problems, the invention according to claim 1 includes a pre-process for attaching a shield to a joint between adjacent frames, and after the pre-process is completed.
An injection step of filling and injecting a foam material into the joint.

According to a second aspect of the present invention, in the joint repair method according to the first aspect, the shield is an elastic body fitted along the joint so as to shield the inside and outside of the joint. It is a gist.

According to a third aspect of the present invention, in the joint repair method according to the second aspect, the elastic body has a width larger than a joint width, and is fitted and attached to the joint in an elastically deformed state. The gist is that.

Therefore, according to the first aspect of the present invention,
When the shield is attached to the joint between the frames, the foam is injected into the joint. Then, the foaming material causes a foaming action in the joint, and the foaming action fills the joint with the foaming material to every corner.

According to the second aspect of the present invention, in addition to the operation of the first aspect, when the elastic body is fitted along the joint, the inside and outside of the joint are shielded by the elastic body,
Thereafter, a foam material is injected into the joint.

According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, the elastic body firmly presses the inner surface of the joint by the force to be restored. Therefore,
The joints are tightly sealed by the elastically deformed elastic body.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention embodied in a box culvert joint repair method used in a road intersection structure will be described below with reference to FIGS.

As shown in FIG. 1, an arterial road 2 paved with asphalt or the like is provided on a roadbed 1 having a slope formed by earth and sand. A crossing road 3 is formed below the main road 2 so as to penetrate the roadbed 1 so as to be orthogonal to the main road 2. The crossing road 3 is formed by using a hollow portion of a box culvert 4 which is a kind of concrete skeleton. That is, the box culvert 4 is a concrete body having a quadrangular cylindrical shape, and the plurality of box culverts 4 are arranged so as to connect end faces to other adjacent box culverts 4. As shown in FIG. 1, the bottom plate 4a of the box culvert 4 is buried in the soil, and the crossing road 3 is formed thereon by asphalt pavement or the like.

As shown in FIG. 2, joints 5 having a constant width are provided between box culverts 4 adjacent to each other. At the time of the new construction, a waterproof plate made of synthetic rubber or the like is embedded in the joint 5 as a joint. However, the joint in which the water stop plate is used is cracked due to various stress concentrations over a long period of time and deterioration of the weather resistance of the joint itself.
Water leakage or the like cannot be prevented from between the joints 5, which may hinder traffic on the crossing road 3. In addition, the water leak causes lime such as free lime to be generated and becomes dirty, which impairs the aesthetic appearance of the inner surface of the box culvert 4. Therefore, joint repair work is required to solve the problem.

In the present embodiment, the joint repair work described above was performed by using a urethane injection method. In this urethane injection method, as a major flow of the process, work proceeds in the order of a preparatory work, a hanging work, a water guide work, a first seal work, an injection work, a second seal work, and a removal work. Hereinafter, the construction method will be described step by step with reference to FIGS.

Preparatory work: At the joint between joints 5 that need repair, a scaffold is assembled on the crossing road 3 so that the repair worker can work easily and safely. Hanger: A joint (waterproof plate made of synthetic rubber or the like) that needs repair is removed using an electric drill or the like. And FIG.
As shown in (1), unnecessary joints adhering to joints 5 between the box culverts 4 are completely removed.

Water guide (pre-process): A rubber plate 6 as a shield and an elastic body is attached to the joint 5 from which the joint has been removed in the above process. Here, as shown in FIG. 4, the rubber plate 6 is a plate having a constant width d larger than the width of the joint 5 and protruding non-slip portions 6a are formed at both ends of one surface. This rubber plate 6
Is made of chloroprene hard rubber in the present embodiment. Features include excellent elasticity and waterproofness. Then, the rubber plate 6 is cut into an appropriate length, and as shown in FIG. 5, the rubber plate 6 is bent (substantially U-shaped in cross section) so that the surface on which the non-slip portion 6a is provided is outside, and is fitted into the joint 5. Attach.
Then, the rubber plate 6 uses the elastic force to press the inner surface of the joint 5 with the non-slip portion 6 a, and is held by the joint 5. At this time, the rubber plate 6 is attached at a position deeper than the inner wall surface of the box culvert 4. In this case, a space is provided for applying the sealing material 11 in a second sealing process described later.
Then, this operation is repeated, and the joint 5 of each box culvert 4 is completely shielded by the rubber plate 6.

First sealing work: As shown in FIG. 6, a sealing material 7 is applied to both ends of the rubber plate 6 attached to the joints 5 in the above-mentioned steps. In this embodiment, an epoxy-based sealing material 7 is used as the sealing material 7. Features include excellent elasticity and waterproofness. Then, both ends of the rubber plate 6 are bonded and fixed to the joints 5 with the sealing material 7. Thereafter, a reinforcing plate (not shown) having a width slightly larger than the width of the joint 5 is temporarily fixed along the joint 5 of each box culvert 4 with a pin anchor (not shown) or the like. This is to prevent the rubber plate 6 from being deformed by the excessively injected urethane 9 when urethane 9 as a foam material described later is excessively injected.

Injecting process (injecting step): After the rubber plate 6 is adhered and fixed in the above step, a hole (injection hole) for inserting the injection pipe 8 is cut into the rubber plate 6 and a reinforcing plate for temporary fixing. The injection pipe 8 is inserted into the hole. The injection pipe 8 used here has a sufficient length to reach the back side of the box culvert 4. Then, as shown in FIG. 7, the injection pipe 8 and a grout pump (not shown) are connected, and urethane 9 is injected from the injection pipe 8. In the present embodiment, the urethane 9 is a poisocyanate-based urethane 9. Characteristically, it has a foaming effect and expands when it reacts with water. Also, it has excellent elasticity, waterproofness and weather resistance. Therefore, when the urethane 9 is injected, the joint 5
Does not require a large-scale pressure curing like the conventional mortar injection method, and the urethane 9 itself can be expanded to fill the corners of the joint 5 with the urethane 9.

FIG. 8 shows the order of urethane 9 injection. In the present embodiment, a plurality of injection positions 10a to 1
Urethane 9 is injected in this order from 0 m. Hereinafter, description will be made step by step. First, each injection position 10a-1 of the joint 5
Drill an injection hole to 0 m. Next, the injection pipe 8 is inserted into the injection hole provided at the lowermost injection position 10a of the one side wall 4c, and the injection of the urethane 9 is started. Here, when the urethane 9 is injected, the urethane 9 is injected from the back of the joint 5, and the injection pipe 8 is gradually pulled toward the near side to be filled. And injection position 1
After filling the joint 5 with the urethane 9 until 0a, the injection pipe 8 is pulled out. Next, the injection pipe 8 is inserted into the injection hole provided at the injection position 10b, and the injection of the urethane 9 is started. This operation is repeated up to the injection position 10 m, and the joints 5 are completely filled with urethane 9. When the urethane 9 is excessively injected, since the excessively injected urethane 9 overflows from the injection hole one position higher than the injection hole being injected, the rubber plate 6 may be displaced from the joint 5. Absent.

Second sealing work: The boundary with the joint 5 is cured with a curing tape (not shown) so that a second sealing material 11 described later does not adhere to the inner wall surface of the box culvert 4. Then, as shown in FIG. 9, the sealing material 11 is coked on the cured joint 5 so as to be flush with the inner wall surface of the box culvert 4, and beautifully finished. In the present embodiment, the sealing material 11
A silicon-based sealing material 11 is used. Features include excellent elasticity and waterproofness. After the sealing material 11 has hardened, the curing tape is peeled off.

Removal work: Scaffolds are removed, and the site is cleaned up. After the above steps, the joint is repaired.
As described above, the present embodiment has the following features.

(1) As a joint between the box culverts 4, the rubber plate 6, the urethane 9, the first and second sealing members 7, 11 and the members which are each made of a material which can be expanded and contracted are used. It is excellent in behavior follow-up to the behavior of the culvert 4. In particular, urethane 9 has a small change in material and is excellent in weather resistance and waterproofness, and therefore can play a role as a joint for a long time.

(2) Since the urethane injection method does not require a large-scale pressure curing, the burden on the operator can be reduced. In addition, since a mold or the like that requires jack-up fixing is not used, the cost can be reduced. Further, the working time can be shortened, and the entire process of the joint repair work can be shortened.

(3) In the case of the urethane injection method, the joints 5 can be filled with the urethane 9 even if it rains during the construction and rainfall penetrates from the slope of the roadbed.
Therefore, the selection of the construction process is easy, which leads to the shortening of the process.

(4) Since the rubber plate 6 is made of inexpensive chloroprene hard rubber, the cost can be reduced. The width d of the rubber plate 6 is wider than the width of the joint 5, and the work of elastically deforming the rubber plate 6 and fitting it into the joint 5 is easy for an operator. 6, the joint 5 can be reliably shielded.

(5) The urethane injection method can easily fill the corners of the joint 5 with the urethane 9 by utilizing the foaming (expansion) action of the urethane 9. (6) By bonding both ends of the rubber plate 6 to the joints 5 with the sealing material 7, urethane 9 can be reliably injected into the joints 5.

(7) By applying the sealing material 11 so as to be flush with the inner wall surface of the box culvert 4, beautiful finishing can be achieved. Note that the present invention may be modified as follows, and in that case, the same operation and effect can be obtained.

(1) In the above embodiment, the rubber plate 6
It was made of chloroprene hard rubber, but has elasticity,
This is not the case if the member is excellent in waterproofness. (2) In the above embodiment, the fixed width d larger than the width of the joint 5
Although the plate-shaped rubber plate 6 was used, any shape having a width larger than the width of the joint 5 may be used. For example, it may be cylindrical.

(3) In the above embodiment, the plate-shaped rubber plate 6 having a constant width d larger than the width of the joint 5 is fitted and attached. However, the rubber plate 6 having the same width is fitted to the joint 5. You may. (4) In the above embodiment, the constant width d wider than the joint 5 width
The urethane 9 is injected into the joint 5 by fitting and attaching the plate-shaped rubber plate 6 described above, but the urethane 9 may be injected along the joint 5 by curing using a mold or the like.

(5) In the above embodiment, the protruding non-slip portions 6a are formed at both ends of one surface of the rubber plate 6.
When the rubber plate 6 is attached to the joint 5 when it is mounted on the joint, it need not be particularly formed.

(6) In the above embodiment, the epoxy-based sealing material 7 is used as the first sealing material 7, but the first sealing material 7 is not limited as long as it is a sealing material excellent in elasticity and waterproofness.

(7) In the above embodiment, the urethane 9
Used poisocyanate-based urethane 9,
This is not limited to a foamed material that has a foaming (expansion) action and is excellent in elasticity, waterproofness, and weather resistance.

(8) In the above embodiment, the silicon sealing material 11 is used as the second sealing material 11, but the second sealing material 11 is not limited as long as the sealing material is excellent in elasticity and waterproofness.

(9) In the above embodiment, the urethane 9 is injected from the injection positions 10a to 10m in this order, but the order is not limited. (10) In the above embodiment, when the urethane 9 is injected, the urethane 9 is injected from the back of the joint 5, and the injection pipe 8 is gradually pulled toward the front to fill the urethane 9, and further, each of the injection positions 10a to 10m.
After the filling of the urethane 9 into the joint 5 was completed, the injection pipe 8 was pulled out.
It may be buried while being inserted into the injection hole provided at 10 m.

(11) In the above embodiment, the joints 5 between the adjacent box culverts 4 are filled with urethane 9, but may be used for joints of other concrete skeletons. (12) In the above embodiment, as the first sealer,
Sealing material 7 was applied to both ends of the rubber plate 6 attached to the joint 5 and both ends of the rubber plate 6 were adhered and fixed to the joint 5, but the rubber plate 6 was securely attached to the joint 5 with its elastic restoring force. If it is, the first sealer may be omitted.

(13) In the above embodiment, the rubber plate 6 is fixed to the joint 5 with the sealing material 7 and then a reinforcing plate having a width slightly larger than the width of the joint 5 is temporarily fixed to the joint 5. However, it is not always necessary to temporarily fix the reinforcing plate.

(14) In the above embodiment, the rubber plate 6 is bonded and fixed between the joints 5 and temporarily fixed and reinforced by the reinforcing plate, and then the injection hole is formed in the rubber plate 6 and the reinforcing plate.
An injection hole may be provided in advance in the rubber plate 6 or the like. In addition, if the injection hole is provided only in the rubber plate 6 and the urethane 9 can be injected without drilling the injection hole in the reinforcing plate, the injection hole may not be particularly provided in the reinforcing plate. In addition, if the urethane 9 can be injected without cutting the injection hole, the injection hole may not be particularly provided in the rubber plate 6 or the like.

Although the embodiments of the present invention have been described above, technical ideas other than the claims that can be grasped from the embodiments will be described below together with their effects. (A) In the joint repair method according to claim 2 or 3,
A first sealer is provided between the water guide (pre-process) and the injection (injection), and an epoxy-based sealing material 7 is applied to both ends of the rubber plate 6 fitted and attached to the joint 5. The rubber plate 6 is bonded and fixed to the joint 5. By providing this step, the rubber plate 6 is securely fixed to the joint 5 and the urethane 9
Can be injected.

(B) In the joint repair method according to any one of claims 1 to 3, a second sealing process is provided after the pouring process (pouring process), and the silicon-based sealing material 11 is applied to the joint 5 into which the urethane 9 has been poured. Caulking is performed so as to be flush with the inner wall surface of the box culvert 4. By providing this step, the joint 5 can be beautifully finished.

[0051]

According to the first aspect of the present invention, the water leakage prevention effect can be maintained at a very high level because, after the construction, it has good followability to the behavior caused by a temperature change or the like and does not crack. And subsidence settlement can be reliably prevented. On the other hand, at the time of construction, construction conditions are not limited, and work can be performed quickly, so that work costs can be reduced.

According to the second aspect of the invention, in addition to the effects of the first aspect, the inside and outside of the joint can be easily shielded by a simple operation of fitting the elastic body along the joint. Can be.

According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, since the joints can be tightly sealed by the elastically deformed elastic body, the foam material can be reliably filled at the time of injection. .

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an overpass of a road according to an embodiment.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a partial cross-sectional view of a main part for describing a joint repair method.

4A is a cross-sectional view of a water guide, and FIG. 4B is a side view of the water guide.

FIG. 5 is a partial cross-sectional view for explaining a water conveyance work.

FIG. 6 is a partial cross-sectional view for explaining a first sealing process.

FIG. 7 is a partial cross-sectional view for explaining an injection work.

FIG. 8 is a view showing an injection position.

FIG. 9 is a partial cross-sectional view for explaining a repair completed state.

[Explanation of symbols]

4 ... box culvert as a frame, 5 ... joints, 6 ...
Rubber plate as shielding body and elastic body, 9 urethane as foam material, d width.

Claims (3)

(57) [Claims] 1. A pre-process for attaching a shield (6) to a joint (5) between adjacent frames (4); and after the pre-process, a foam material (9) is placed in the joint (5). And a filling process. 2. The joint repair method according to claim 1, wherein the shield (6) is fitted along the joint (5) so as to shield the inside and outside of the joint (5). ) Is a joint repair method. 3. The joint repair method according to claim 2, wherein the elastic body (6) has a width (d) wider than a joint (5) width.
A joint repair method that is fitted and attached while being elastically deformed into the joint (5).