CN103194949B - Structure and method for repairing cracks of oblique prestressed cement concrete pavement - Google Patents

Abstract

The invention relates to a repairing technology for cement concrete pavement cracks, and discloses an oblique prestressed cement concrete pavement crack repairing structure and a repairing method. The oblique prestressed cement concrete pavement includes prestressed steel bars and a sliding layer, and is characterized in that the upper part of the prestressed steel bars is provided with slotted slots along the cracks, and the bottom of the slotted slots is provided with interconnected slots at intervals along the direction of the cracks. In the plurality of boreholes of the sliding layer, horizontal reinforcement cages are provided in the slots, and vertical reinforcement cages are provided in the drilling holes. Whether the grouting in the slots and the boreholes has shrinkage grouting material; the repair method includes slot drilling, pre-grouting and bar-tie grouting, which can quickly repair the transverse cracks generated in the oblique prestressed cement concrete pavement, and the method is simple and reliable.

Description

An oblique prestressed cement concrete pavement crack repair structure and repair method

technical field

The invention relates to a technology for repairing cracks in cement concrete pavements, in particular to a structure and method for repairing cracks in obliquely prestressed cement concrete pavements.

Background technique

In recent years, with the development of transportation, under the circumstances of heavy-duty traffic and high asphalt prices, the new application research of cement pavement has entered a new stage. Cement concrete pavement has unique advantages, such as high strength, good stability, and long service life. However, there are a large number of expansion joints on the pavement, which often cause diseases such as crushing, arching, misalignment, and mud pumping; at the same time, a large number of Large expansion joints will also increase road noise and affect driving comfort. Prestressed concrete pavement can use few transverse joints to achieve surface smoothness and eliminate cracks.

Prestressed concrete pavement has the characteristics of high bearing capacity, strong deformation resistance, high pavement durability, and good driving comfort. It was researched and developed abroad in the 1940s. The earliest use was in France, and later Britain and other European countries used it on road pavement or airport pavement. Countries such as the United States, Japan and the former Soviet Union have also built a certain number of prestressed concrete pavement and airport pavement. These pavement prestressed steel bars are arranged longitudinally, and the construction period is long and the construction is complicated. The application of longitudinal prestressed force greatly improves the longitudinal bearing capacity of the pavement, but has almost no effect on the transverse direction.

Oblique prestressed cement concrete pavement is a new type of cement concrete pavement structure. This pavement structure is to arrange two layers of oblique prestressed steel bars on the pavement, and generate prestress in the transverse and longitudinal directions of the pavement. The bearing capacity of the pavement is greatly improved. , and increase its service life, improve driving comfort.

However, because the oblique prestressed cement concrete pavement has a long concrete slab, under temperature changes, the frictional stress on the bottom of the concrete slab may cause cracks on the pavement, and the cracks are prone to spalling, and water enters from the cracks, resulting in damage to the pavement base. resulting in damage to the pavement structure.

Contents of the invention

The object of the present invention is to provide an oblique prestressed cement concrete pavement crack repair structure and repair method, which can quickly repair the transverse cracks generated in the oblique prestressed cement concrete pavement, and the method is simple and reliable.

In order to achieve the above object, the present invention adopts the following technical solutions to achieve.

(1) A crack repair structure for oblique prestressed cement concrete pavement, wherein the oblique prestressed cement concrete pavement includes prestressed steel bars and a sliding layer, and is characterized in that the upper part of the prestressed steel bars is provided with A slotted slot opened along the crack, the bottom of the slotted slot is provided with a plurality of drill holes connecting the sliding layer at intervals along the direction of the crack, a horizontal reinforcement cage is arranged in the slotted slot, and a vertical reinforcement cage is arranged in the drilled hole. There is no shrinkage grouting material for grouting in the steel cage, the slots and the boreholes.

The characteristics and further improvement of this technical solution are:

The horizontal reinforcement cage is a reinforcement cage with a rectangular cross-section, including four horizontal structural reinforcements arranged in parallel and rectangular stirrups arranged at intervals along the direction of the horizontal structural reinforcements.

The vertical reinforcement cage is a columnar reinforcement cage, including at least three vertical structural reinforcements arranged axially on the outer circumference and annular stirrups arranged along the direction of the vertical structural reinforcements.

The top surface of the vertical reinforcement cage is on the same level as the top surface of the horizontal reinforcement cage and is lower than the road surface, and the top surface of the vertical reinforcement cage is connected to the top surface of the horizontal reinforcement cage.

(2) A method for repairing cracks in an oblique prestressed cement concrete pavement, wherein the oblique prestressed cement concrete pavement includes prestressed steel bars and a sliding layer, characterized in that it includes the following steps:

(a) Slot drilling: open a slot with a width of W along the crack, the bottom of the slot is located above the prestressed steel bar, W is the minimum repair width of the transverse crack, and then space along the direction of the crack at the bottom of the slot A plurality of boreholes communicating with the sliding layer are drilled.

(b) Pre-grouting: Rinse the slotted groove and the drilled hole, mix the non-shrinkable grouting material with water until it is uniform without agglomeration, stir after aging, and grout into the drilled hole, and then use a grouting machine to add Press the pressure to make the slurry in the borehole flow into the void at the top of the surrounding sliding layer. The characteristics and further improvement of this technical solution are:

The non-shrinkage grouting material is Bostik NS60 general-purpose non-shrinkage grouting material, and its mixing weight ratio with water is 25:4.4.

(c) Reinforcement grouting: first arrange the vertical reinforcement cage in the drilled hole, and pour non-shrinkage grouting material into the drilled hole; then, place the horizontal reinforcement cage in the slot, and its top surface and the vertical reinforcement cage After the top surfaces of the roads are horizontal and overlapped with each other, pour and tamp with non-shrinkage grouting materials to make the newly poured road surface and the adjacent old road surface evenly connected. The characteristics and further improvement of this technical solution are:

The non-shrinkage grouting material is a mixture of Bostik NS60, crushed stone (10-20mm in diameter) and water, wherein the weight ratio of Bostik NS60 to crushed stone is 7:3-6:4, water and Bostik The weight ratio of glue NS60 is 0.18.

A kind of oblique prestressed cement concrete pavement crack repair structure and repair method of the present invention provides specific repair measures and methods for the cracks in oblique prestressed cement concrete pavement, and the prestressed reinforcement layer is drilled and repaired, and at the same time Bost glue is used for filling, which has high strength, and the non-shrinkage grouting material used is less affected by the ambient temperature, etc., and can be flat and seamlessly repaired with the old road surface. The repair method is simple and reliable.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the longitudinal elevation view of a kind of oblique prestressed cement concrete pavement crack repair structure and repair method of the present invention;

Fig. 2 is the cross-sectional elevation view of oblique prestressed cement concrete pavement crack repair structure and repair method shown in Fig. 1;

Fig. 3 is the plane view of the horizontal reinforcement cage of oblique prestressed cement concrete pavement crack repair structure and repair method shown in Fig. 1;

Fig. 4 is the plane view of the vertical reinforcement cage of the oblique prestressed cement concrete pavement crack repair structure and repair method shown in Fig. 1 .

In the figure: 1, horizontal reinforcement cage; 2, vertical reinforcement cage; 3, drilling; 4, horizontal structural reinforcement; 5, rectangular stirrup; 6, circular stirrup; 7, vertical structural reinforcement.

Detailed ways

Referring to Fig. 1 and Fig. 2, it is a longitudinal elevation view and a cross-sectional elevation view of a kind of oblique prestressed cement concrete pavement crack repair structure and repair method of the present invention. Wherein, it is assumed that the width of the oblique prestressed cement concrete pavement is B, the height of the cement concrete slab is h, and there are slots cut with a cutting machine along the cracks in the road surface. The width of the slots is W, and W is the minimum of the crack. The width of the repair (when the crack is at an angle of θ to the transverse line of the road surface, W=B*tgθ), the bottom surface of the slot is located above the prestressed steel bar, which is h/2. Drill holes 3 with a diameter of 10 cm at the bottom of the prestressed steel bars with an electric drill, the holes 3 are arranged at intervals of 20 cm, the depth of the holes is h/2, and the holes 3 communicate with the sliding layer. A horizontal reinforcement cage 1 is arranged in the slotted slot, and a vertical reinforcement cage 2 is arranged in the borehole 3 .

Referring to Fig. 3 and Fig. 4, it is a plan view of the horizontal reinforcement cage and the vertical reinforcement cage of the oblique prestressed cement concrete pavement crack repair structure and repair method shown in Fig. 1 . Horizontal reinforcement cage 1 is a reinforcement cage with a rectangular section, including four horizontal structural reinforcements 4 arranged in parallel and rectangular stirrups 5 arranged at intervals along the direction of the horizontal structural reinforcements 4. The rectangular stirrups 5 are arranged at intervals of 20 cm, and the horizontal structural reinforcements The diameter of 4 is 8mm, the diameter of rectangular stirrup 5 is 6mm, the width of rectangular stirrup 5 is (W-6) cm, the length is (B-10) cm, and the height is 3 cm lower than the road surface after installation; The straight reinforcement cage 2 is a columnar reinforcement cage, comprising at least three vertical structural reinforcements 7 axially arranged on the outer circumference and annular stirrups 6 arranged along the direction of the vertical structural reinforcements 7, the diameter of the vertical structural reinforcements 7 is 8 mm, and The diameter of stirrup 6 is 6mm, and the diameter of vertical reinforcement cage 2 is 5cm; The top surface of vertical reinforcement cage 2 and the top surface of horizontal reinforcement cage 1 are on the same level and lower than road surface height 3cm, vertical reinforcement cage 2 The top surface of and the top surface of the horizontal reinforcement cage 1 are interconnected.

The repair method step of oblique prestressed cement concrete pavement crack of the present invention is as follows:

(a) Slot drilling: open a slot with a width of W along the crack, the bottom of the slot is located above the prestressed steel bar, that is, the depth of the slot is h/2, and W is the minimum repair width of the transverse crack , then at the bottom of the slit groove along the direction of the crack, drill a plurality of boreholes 3 connecting the sliding layer with an electric drill at intervals. The diameter of the boreholes 3 is 10cm, and the boreholes 3 are arranged at intervals of 20cm. The depth of the boreholes 3 is h/ 2.

(b) Pre-grouting: Use a high-pressure water gun to rinse the slotted groove and drill hole 3, add Bostik NS60 general-purpose non-shrinkage grouting material and water and mix until uniform without agglomeration (mixing Bostik NS60 general-purpose non-shrinkage grouting material with water The weight ratio is 25:4.4), stir after aging, and grout into the borehole 3 to reach half the height of the borehole 3, and then use a grouting machine to pressurize the borehole 3 to make the grout in the borehole flow into the surrounding in the gap at the top of the slide layer.

(c) Grouting for bars: First, arrange the vertical reinforcement cage 2 in the drilled hole 3, and pour special non-shrinkage grouting material into the drilled hole 3; then, place the horizontal reinforcement cage 1 in the slot, and its top After being level with the top surface of the vertical steel cage (3cm below the road surface height) and overlapped with each other, the special non-shrinkage grouting material is used for pouring, inserting and tamping, so that the newly poured road surface and the adjacent old road surface are connected smoothly. The preparation method of the special non-shrink grouting material is as follows: the weight ratio of Bostik NS60 to crushed stone (10-20mm in diameter) is 7:3-6:4, and the weight ratio of water to Bostik NS60 is 0.18 for stirring and mixing.

The strength of the special non-shrinkage grouting material is as follows:

The compressive strength of 7d is 49MPa;

The compressive strength of 28d is 62.1MPa;

The flexural strength of 28d is 6.07MPa;

The shrinkage of 3d is 0.012mm.

The vertical and horizontal of the present invention are not absolute, but are relative to the road surface. The invention provides a specific repair structure and method for the cracks on the oblique prestressed cement concrete pavement, and the repair method is simple, easy and reliable.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, instructive, and not restrictive. Under the enlightenment of this description, those skilled in the art can also make many forms without departing from the protection scope of the claims of the present invention, and these all belong to the protection of the present invention.

Claims (7)

1. the preparing structure of an oblique prestressing force cement concrete cracks, wherein, described oblique prestressing force cement concrete pavement comprises prestressed reinforcement and sliding layer, it is characterized in that, the top of described prestressed reinforcement is provided with the slot driller offered along crack, be interval with the multiple borings being communicated with described sliding layer along fractuer direction bottom slot driller, horizontal reinforcement cage is provided with in described slot driller, be provided with vertical reinforcing steel bar cage in described boring, described slot driller and the interior grouting of described boring have contraction-free grouting concrete.

2. the preparing structure of oblique prestressing force cement concrete cracks according to claim 1, it is characterized in that, the reinforcing steel bar cage of described horizontal reinforcement cage to be cross section be rectangle, comprises four horizontal tectonics reinforcing bars be arranged in parallel and along the spaced rectangle hoop in described horizontal tectonics reinforcing bar direction.

3. the preparing structure of oblique prestressing force cement concrete cracks according to claim 1, it is characterized in that, described vertical reinforcing steel bar cage is column reinforcing steel bar cage, the ring-shaped stirrup comprising at least three vertical distributing bars circumferentially axially arranged outside and arrange along described vertical distributing bar direction.

4. the preparing structure of oblique prestressing force cement concrete cracks according to claim 1, it is characterized in that, the end face of described vertical reinforcing steel bar cage and the end face of described horizontal reinforcement cage are in same level and lower than pavement-height, the end face of described vertical reinforcing steel bar cage and the end face of described horizontal reinforcement cage are interconnected.

5. a method for repairing and mending for oblique prestressing force cement concrete cracks, wherein, described oblique prestressing force cement concrete pavement comprises prestressed reinforcement and sliding layer, it is characterized in that, comprises the following steps:

(1) to crack boring: offering a width along crack is the slot driller of W, slot driller bottom surface is positioned at more than prestressed reinforcement, W is the minimum repairing width of transverse crack, bottom slot driller, be then drilled with the multiple borings being communicated with described sliding layer along fractuer direction interval;

(2) pregrouting: rinse slot driller and boring, contraction-free grouting concrete is added water and mixes to evenly without caking, stir again after slaking, and be grouted in boring, then with pneumatic mortar machine pressurization in boring, the slurries in boring are made to flow in the space at sliding layer top around;

(3) muscle grouting is pricked: be first arranged in boring by vertical reinforcing steel bar cage, in boring, pour into contraction-free grouting concrete; Then, horizontal reinforcement cage is placed in slot driller, the end face level of its end face and vertical reinforcing steel bar cage, and mutually after overlap joint, carries out watering, plugging and pounding with contraction-free grouting concrete, make the road surface of newly building and the smooth connection of adjacent old pavement.

6. the method for repairing and mending of oblique prestressing force cement concrete cracks according to claim 5, it is characterized in that, contraction-free grouting concrete in described step (2) is the general contraction-free grouting concrete of boss's glue NS60, and it is 25:4.4 with the mixed weight ratio of water.

7. the method for repairing and mending of oblique prestressing force cement concrete cracks according to claim 5, it is characterized in that, contraction-free grouting concrete in described step (3) is boss's glue NS60, diameter is the rubble of 10-20mm and the mixture of water, wherein the weight ratio of boss's glue NS60 and rubble is 7:3 ~ 6:4, and the weight ratio of water and boss's glue NS60 is 0.18.