CN111549652B - Construction method for preventing expansion joint vehicle jumping of prefabricated section beam - Google Patents

Abstract

The invention discloses a construction method for preventing expansion joint jumping of a prefabricated section beam, and aims to solve the technical problem of expansion joint jumping of the prefabricated section beam. The construction method comprises the following steps in sequence: (1) pouring flat stones at the anti-collision wall; (2) temporarily pouring concrete at the expansion joint; (3) paving the expansion joint with asphalt and transversely rolling; (4) breaking the asphalt and the concrete; (5) and installing an expansion joint, wherein the expansion joint comprises chiseling and seam cleaning, molding, assembling a synchronous half shaft rubber support, pouring an elevation adjusting layer and assembling a telescopic panel. The temporary filling of the expansion joint is changed into the pouring concrete, the asphalt paving vehicle is smoother when passing through the temporary filling concrete, the road surface near the expansion joint is not bumpy due to insufficient temporary filling strength on the asphalt surface, the vehicle jumping possibly caused by the asphalt concrete at the expansion joint in the construction process is greatly reduced, and the service life of the expansion joint is prolonged.

Description

Construction method for preventing expansion joint vehicle jumping of prefabricated section beam

Technical Field

The invention relates to the technical field of expansion joints of sectional beams, in particular to a construction method for preventing the expansion joint from jumping in a prefabricated sectional beam.

Background

The urban bridge expansion joint vehicle jumping affects the safety and comfort of driving and the durability of the expansion joint, and the replacement of the expansion joint often affects the traffic, so that the influence of vehicle jumping on the durability of the expansion joint is very important to reduce. In the construction process, the main reasons for the problem of vehicle jumping of the prefabricated segmental beam comprise the following aspects: (1) the elevation of top surface concrete of the precast segment beam side pier zero block deviates in the construction process, and in a bridge deck structure layer without a pavement layer, the elevation deviation of an asphalt surface at an expansion joint is influenced without taking measures; (2) in the traditional construction, gravel or construction waste is placed at the expansion joint, and the gravel or the waste placed when the asphalt paver walks on the expansion joint can deform in the paving process, so that the paved asphalt pavement is not smooth near the expansion joint; (3) the asphalt paving often forms a joint at the expansion joint, and the asphalt rolling at the joint is unreasonable to cause the phenomenon of vehicle jumping at the expansion joint at the later stage; (4) because the steel fiber concrete is poured at last in the expansion joint installation process, the top surface elevation of concrete differs and leads to the driving in-process to jump.

Disclosure of Invention

The invention aims to provide a construction method for preventing an expansion joint from jumping over a vehicle by prefabricating a segmental beam, so as to solve the technical problem of the expansion joint jumping over the prefabricated segmental beam.

In order to solve the technical problems, the invention adopts the following technical scheme:

a construction method for preventing expansion joint vehicle jumping of a prefabricated section beam is designed, and comprises the following steps: (1) pouring flat stones at the anti-collision wall; (2) temporarily pouring concrete at the expansion joint; (3) paving the expansion joint with asphalt and transversely rolling; (4) breaking the asphalt and the concrete; (5) and (5) installing the expansion joint.

Preferably, in the step (1), the thickness of the flat stone poured at the main line anti-collision wall is 9.5-10cm, and the width of the flat stone is 30 cm; the thickness of the flat stone poured at the anti-collision wall of the ramp is 9.5-10cm, and the width of the flat stone is 20 cm.

Preferably, in the step (1), the flat stones are poured at intervals of 1.5 meters.

Preferably, in the step (2), a hard foam plate is arranged at the center joint of the temporarily poured concrete, and the side line of the temporarily poured concrete is marked on the anti-collision wall or the flat stone.

Preferably, in the step (3), the integral elevation of the bridge deck is measured, a steel wire is hung on a main line, the length of each section of the area is 50-100 m, the steel wire is bounced to the anti-collision wall through triangular control at two ends, and an asphalt concrete control line is bounced to serve as a paving elevation basis.

Preferably, in the step (5), the following steps are included: firstly, chiseling and seam cleaning; secondly, moulding; assembling a synchronous half-shaft rubber support; fourthly, pouring an elevation adjusting layer; assembling the telescopic panel.

Preferably, in step (ii), the mold is made with a foam board.

Preferably, in the step three, pouring ultrahigh-performance concrete into the notch of the support, and adjusting the elevation of all the synchronous half-shaft rubber supports once by using the support tool within 15 minutes.

Preferably, in the step (iv), the initial casting height is 5mm higher than the molding height.

Preferably, in the fifth step, the embedded parts or the upper comb plate are installed one by one, and after the installation is finished, the height difference between the top surface of the expansion joint and the road surface is not more than 1.5 mm.

Compared with the prior art, the invention has the beneficial technical effects that:

1. the temporary filling of the expansion joint is changed into the pouring concrete, the asphalt is paved after the concrete is poured, a vehicle passes through the temporary filling concrete, the paving is smoother than the conventional temporary measures, and the road surface near the expansion joint cannot bump due to insufficient temporary filling strength on the asphalt surface.

2. The method utilizes the stay wire to pour the flat stone, so that the elevation of the top surface of the asphalt concrete is easier to control.

3. The height of the top surface of the concrete is determined by using the guiding ruler with the length of 3 meters, so that the expansion joint is ensured to be stable and excessive.

4. The invention greatly reduces the possible vehicle jumping at the expansion joint during the construction process, and prolongs the service life of the expansion joint.

Detailed Description

The following examples are given to illustrate specific embodiments of the present invention, but are not intended to limit the scope of the present invention in any way.

Example 1: a construction method for preventing expansion joint vehicle jumping of a prefabricated section beam comprises the following steps: (1) drawing a 10m through line and pouring a flat stone; (2) c30 concrete is poured temporarily at the expansion joint; (3) transversely rolling the asphalt paving expansion joint; (4) breaking asphalt and concrete; (5) and (5) installing an expansion joint.

In the step (1), a 10-meter through line is pulled to pour the flat stone. A cast-in-place flat stone is arranged at the main line anti-collision wall, the thickness of the flat stone is 9.5-10cm (the specific thickness is based on the asphalt surface layer), and the width of the flat stone is 30 cm; the cast-in-place flat stone with the thickness of 9.5-10cm (the specific thickness is based on the asphalt surface layer) and the width of 20cm is arranged at the ramp anti-collision wall; the flat stone concrete is poured at intervals, and the intervals are 1.5 meters. And (4) paying attention to the transverse slope in the transverse bridge direction of the road surface when the flat stone is poured, and controlling the elevation of the flat stone in the bridge direction according to the elevation of the top surface of the asphalt concrete.

In the step (2), C30 concrete is poured temporarily at the expansion joint, and a layer of isolation is needed between the top surface of the post-cast strip and the temporarily poured concrete. A rigid foam board with the thickness of 1cm must be arranged at the middle joint of the poured temporary concrete, so that the concrete is prevented from being damaged by the deformation of the expansion joint when the asphalt concrete is paved. The concrete pouring needs to be vibrated and compacted without bubbles. The top surface elevation of concrete is smoothly connected with the concrete at two sides of the expansion joint, so that jolting is avoided when the paver works. The side line of concrete placement will be marked on crashproof wall or flat stone, is used for snapping line when later stage is abolished and is looked for the side line.

And (3) transversely rolling the asphalt paving expansion joint. When the asphalt concrete is paved, the asphalt concrete is transversely rolled in the range of 10 meters along the bridge direction at the expansion joint, and the flatness of the asphalt concrete at the expansion joint is timely checked by using a 3-meter guiding rule after the rolling is finished. The asphalt paving is controlled by the side flat stones, and after the steel wheel road roller rolls, the asphalt and the side flat stones can be better combined, so that the drainage is facilitated, the service life of the asphalt is prolonged, and the maintenance is reduced. Because the side flat stones reduce the collision to the anti-collision wall when the road roller is constructed, the vertical surfaces at the inner sides of the anti-collision wall are uniform in height, smooth in linear and attractive and elegant. Under the condition of no flat stone, the rolling at the joint of asphalt paving and an anti-collision wall is unreasonable, gaps exist, the water prevention and drainage of a bridge deck are not facilitated, the service life of asphalt is shortened, and the long-time dry-wet alternate carbonization protection is easy to realize. As the elastic line on the anti-collision wall is used as an asphalt paving datum line, the asphalt flatness is easily influenced, so that the heights of vertical planes on the inner side of the anti-collision wall are uneven, and the appearance is influenced.

In step (4), the asphalt and concrete are broken. And (4) paying attention to finding a finished side seam mark, making a cutting base line by popping the through line, carrying out cutting operation according to the drawn base line, and strictly forbidding cutting side lines to be irregular. The notch is ensured to be straight during cutting, and the straightness meets 1.5 mm/m. After cutting, the cutting line must not be bent to the naked eye. And (4) breaking the asphalt concrete by using an air pick, strictly forbidding using a small gun hammer, and paying attention to protecting the edge concrete of the post-cast strip.

In the step (5), the expansion joint is installed. Scabbling and gap cleaning: chiseling the concrete on the bottom surface of the seam area, and cleaning up sundries in the structural seam without any sundries affecting the concrete connection effect. Molding: and installing an inner hexagonal full-silk head process screw, and molding by using a foam board to ensure that slurry does not leak. Assembling a synchronous half shaft rubber support: pouring ultra-high performance concrete into the notch of the support, and adjusting the elevation of all synchronous half-shaft rubber supports by using a support tool once within 15 minutes of effective operation time, wherein the error requirement is less than 0.5 mm. Pouring an elevation adjusting layer: the quality (slump, water cement ratio, workability and the like), the operation time (initial setting time is controlled to be about 20 minutes) and the pouring quality of the ultra-high performance concrete are ensured, and the initial pouring elevation requirement is 5mm higher than the forming elevation. Assembling a stainless steel plate and a telescopic panel: and synchronously assembling the dustproof stainless steel plates. Assembling a telescopic panel: and (3) synchronously replacing the inner hexagonal full-fiber optical head process screw, mechanically adjusting the flatness of the connection between the telescopic panel and the asphalt bridge deck by using a primary pressurizing screw, and checking the height difference between the top surface of the telescopic device and the road surface by using a 3-meter ruler (one measuring point is arranged every 2m along the transverse bridge direction). Filling epoxy resin into the counter bore of the bolt for preventing loosening and rust: before filling epoxy resin into the counter bore of the panel, cleaning welding slag and other sundries in the counter bore; the epoxy resin should be purchased from a regular and stable manufacturer, and a fake product cannot be used; the epoxy resin slurry is prepared according to the standard, namely the epoxy resin slurry is prepared immediately, and the color is controlled to be uniform (the color of the cured epoxy resin is transparent light yellow); the epoxy resin slurry can not be higher than the pavement and can not pollute the pavement. When in pre-buried construction, the height of the top surface of the pre-buried part is ensured to be about 20mm lower than the designed height; during pre-embedding construction, the welding between the pre-part and the beam body pre-embedded steel bar is ensured to be firm, and the welding length meets the standard requirement; the elevation leveling layer is made of ultra-high performance concrete, and after the comb plate is installed, the gap between the comb plate and asphalt is tightly filled with the ultra-high performance concrete; when the expansion joint framework is welded, double-support welding is carried out on the expansion joint framework and the embedded rib, so that the strength of the joint of the expansion joint panel and the embedded rib at the later stage is ensured; when the expansion device is installed, the embedded parts or the upper comb plate are installed one by one from one end to the other end, and after the comb plate is installed, the height difference between the top surface of the expansion joint and the road surface is not more than 1.5 mm.

The expansion device has no phenomena of blockage, leakage, deformation and cracking, and must be renovated when not meeting the requirements, and the installation and inspection items of the expansion device are shown in table 1:

TABLE 1 telescoping device installation inspection

。

The construction method is suitable for construction of the segmental beam and the cast-in-place beam for preventing the skip of the expansion joint by a post-assembly method, a non-deformable foundation is provided for asphalt paving by utilizing temporarily poured concrete, the top surface elevation of the asphalt concrete during paving is controlled by utilizing flat stones poured on two sides of a road surface, the transverse bridge unevenness at the expansion joint is eliminated by utilizing transverse rolling at the expansion joint of a road roller, and the top surface elevation of the concrete poured at the expansion joint is leveled by using a 3-meter guiding ruler. The method ensures the smooth driving at the expansion joint. The invention can prevent the common quality fault of the jumping of the expansion joint, prolong the service life of the expansion joint, reduce traffic jam caused by later-stage expansion joint maintenance and reduce the later-stage maintenance cost.

For example, the total construction cost of two standard sections of four ring sections of the Zhengzhou city four ring line and the great river road rapid engineering is 19.8 billion, the planned construction period is 540 calendar days, the construction mileage is K81+ 162.322-K84 +891.731, the total construction period is 3.729km, the total construction period comprises an expansion joint 3027.3 meters, and 2894.5 meters (246 roads) are constructed by the construction method. Engineering construction has not appeared the problem of expansion joint department jump car till now. According to the proportion of reducing 15% of expansion joint maintenance, 8300 yuan per meter of expansion joint, 2894.5 multiplied by 15% x 8300=120.101 yuan of expansion joint maintenance cost is comprehensively saved.

Comparative example 1: the flow of traditional expansion joint way: filling sand bags or gravel → paving asphalt → cutting seams and slotting → installing expansion joints. Before paving asphalt on a traditional expansion joint, a sand bag or gravel is filled, then asphalt paving is carried out, a joint is cut, and then expansion joint installation is carried out. This has the following disadvantages: the gravel placed on the asphalt paver when the asphalt paver walks on the asphalt paver in the paving process can deform, so that the paved asphalt pavement is not smooth near the expansion joint. Secondly, the asphalt paving often forms a stubble at the expansion joint, and the asphalt rolling at the stubble causes the phenomenon of vehicle jumping at the expansion joint in the later period. And thirdly, the prefabricated section beam is not generally paved with a layer relative to the cast-in-place overhead, and the top concrete elevation of the prefabricated section beam side pier 0# block can deviate in the construction process, so that the deviation of the elevation of the asphalt surface at the expansion joint can be influenced.

The construction method comprises the following steps: firstly, pouring concrete → paving asphalt → cutting and slotting → installing expansion joints. Lay the concrete earlier, level mutually with the bridge floor, then spread the pitch, fluting joint-cutting, installation expansion joint do and have following advantage for traditional expansion joint construction: firstly, the temporarily poured concrete is utilized to provide a non-deformable foundation for asphalt paving, and the concrete has enough bearing capacity. The asphalt paving machine guarantees smooth asphalt paving and consistent elevation, does not have stubble connection, provides a reference datum line for installation of the expansion joint, guarantees construction quality of the expansion joint, reduces the phenomenon of vehicle jumping, and provides driving comfort.

Comparative example 2: conventional asphalt paving typically employs spring lines on the side impact walls of the roadway to establish a longitudinal reference datum for the automatic leveling system of the paving machine. The elastic line adopts a linear approximation principle, the integral height of the bridge deck is measured in advance according to the flatness and gradient conditions of the concrete base layer of the bridge deck in the current situation, a steel wire line is hung on a main line at a point of 10m according to the standard requirement, and the length of each section of the steel wire is preferably 50-100 m. The lines are popped to the anti-collision wall through the triangular control at the two ends, and an asphalt concrete control line is popped out to serve as the paving elevation basis. The traditional line snapping method has the following defects: firstly, a traditional line snapping method is adopted, in order to ensure smooth overlapping of all sections, a total station is needed to measure a longitudinal slope of a bridge floor, then line snapping is carried out, a main line snaps every 10m, time is long, and labor and force are wasted. Secondly, errors exist in the manual elastic thread according to the level of the technical proficiency, and bridge deck curves are changed due to the height change of the bridge deck, and although elastic thread measuring points are added in the process, the artificial elastic thread is still a main factor influencing the paving flatness of the bridge deck asphalt. This engineering does not have the layer of mating formation, and when pitch was paved, in order to avoid causing the damage to crashproof wall, it was not real to roll opposite side angle position to the tradition way, can not make bituminous concrete and crashproof wall root zonulae occludens completely, influenced the drainage quality to a certain extent during rainy season, also caused the bridge floor to leak easily, led to the fact the influence to bituminous paving and waterproof layer durability.

The method has the advantages that the flat stone is adopted to control the concrete paving: firstly, the main line of the engineering adopts a 9m section of aluminum alloy template as an outer template of the main line flat stone, a wood template with the size of 300mm multiplied by 100mm is vertically arranged in the main line flat stone as an expansion joint, a 3 m section of aluminum alloy template is adopted as an outer template for the position with obvious elevation change of a beam curve, and the flat stone can be used as a height reference base line of asphalt laying engineering, so that the labor cost is reduced, the construction period is shortened, the error is reduced, and the turnover frequency is increased. Due to the existence of the flat stones, the steel wheel road roller can better roll the edges of the flat stones and the asphalt, so that the smoothness of the asphalt is increased, the elevation is consistent, and no connecting stub exists. And thirdly, the elevation of the top surface of the asphalt concrete is easier to control by utilizing a stay wire to pour the flat stone. Reduce the phenomenon of jumping, prolong service life, reduce bridge water leakage due to the tight combination of the flat stone and the asphalt longitudinal surface. Due to the existence of the flat stone, the rotten root of the anti-collision wall is reduced.

Comparative example 3: and (3) noise testing: the expansion and contraction that factors such as adaptation temperature caused is crossed to the overpass, and the beam-ends of bridge often set up an expansion joint, and different schemes are adopted in different designs, and the overpass mainly has two kinds in zheng zhou urban area: one is the shaped steel expansion joint, the other is the fishback expansion joint. Adopt decibel appearance to zheng zhou different cities overhead expansion joint vehicles when passing transient noise and carried out the noise test, see table 2:

TABLE 2 comparison of expansion joint noise at different road sections

Site	First test noise (dB)	Second test noise (dB)
			Expansion joint of certain comb plate at intersection of Xitetracyclo two-section crossroad	60.9	62.2
Expansion joint of certain overhead comb plate	75.6	77.2
			Overhead certain shaped steel modulus formula expansion joint of agricultural road	91.6	85.8
Jingsha elevated certain steel single-slit type expansion joint	98.2	88.0

When passing through the bridge expansion joint, the vehicle can produce obvious jump car and assault and the low frequency sound wave radiation, and through simple investigation, the fishback expansion joint obviously produces the noise lower than the shaped steel expansion joint, and the vibration is little. After the novel expansion joint method is adopted, the noise value generated by the transient sound pressure wavelet of the two-axis trolley passing through the expansion joint is recorded through decibel instrument detection, the maximum, the minimum and the average value are obtained, the actual value of the noise is obtained, and the noise generated between the same ratio is reduced by 10 decibels.

Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes in the specific parameters of the embodiments may be made without departing from the spirit of the present invention, and a plurality of specific embodiments are formed, which are common variations of the present invention, and will not be described in detail herein.

The invention discloses a construction method for preventing expansion joint jumping of a prefabricated section beam, and aims to solve the technical problem of expansion joint jumping of the prefabricated section beam. The construction method comprises the following steps in sequence: (1) pouring flat stones at the anti-collision wall; (2) temporarily pouring concrete at the expansion joint; (3) paving the expansion joint with asphalt and transversely rolling; (4) breaking the asphalt and the concrete; (5) and installing an expansion joint, wherein the expansion joint comprises a chiseling and seam cleaning step, a molding step, a synchronous half shaft rubber support for assembling, a pouring elevation adjusting layer and an assembling telescopic panel. The temporary filling of the expansion joint is changed into the pouring concrete, the asphalt paving vehicle is smoother when passing through the temporary filling concrete after the concrete is poured compared with the traditional temporary measures, the road surface near the expansion joint cannot bump due to insufficient temporary filling strength on the asphalt surface, the vehicle jumping possibly caused by the asphalt concrete at the expansion joint in the construction process is greatly reduced, and the service life of the expansion joint is prolonged.

Claims (2)

1. The construction method for preventing expansion joint vehicle jumping of the prefabricated section beam is characterized by comprising the following steps of:

(1) drawing a 10-meter through line at the position of the anti-collision wall to pour flat stones, wherein the flat stones are poured at intervals, and the intervals are 1.5 meters;

(2) temporarily pouring concrete at the expansion joint; a hard foam board is arranged at the center joint of the temporarily poured concrete, and the side line of the temporarily poured concrete is marked on the anti-collision wall or the flat stone;

(3) paving the expansion joint with asphalt and transversely rolling; measuring the whole elevation of the bridge deck, hanging a steel wire on a main line, wherein the length of each section is 50-100 m, ejecting the steel wire to the anti-collision wall through triangular control at two ends, and ejecting an asphalt concrete control line to serve as a paving elevation basis;

(4) breaking the asphalt and the concrete;

(5) installing an expansion joint, comprising the following steps: roughening and seam cleaning; secondly, manufacturing a mould by using a foam board; assembling the synchronous half-shaft rubber support, pouring ultrahigh-performance concrete into the notch of the support, and adjusting the elevation of all the synchronous half-shaft rubber supports by using a support tool once within 15 minutes; fourthly, pouring an elevation adjusting layer, wherein the initial pouring elevation is 5mm higher than the forming elevation; fifthly, assembling the telescopic panels, installing the embedded parts or the upper comb plate one by one, and after the installation is finished, enabling the height difference between the top surface of the telescopic joint and the road surface to be not more than 1.5 mm.

2. The construction method for preventing expansion joint vehicle jumping of the precast segmental beam as claimed in claim 1, wherein in the step (1), a flat stone is poured at the main line anti-collision wall, wherein the thickness of the flat stone is 9.5-10cm, and the width of the flat stone is 30 cm; the thickness of the flat stone poured at the ramp anti-collision wall is 9.5-10cm, and the width is 20 cm.