CN217479952U - Cast-in-place UHPC bridge floor socket joint formula connecting device - Google Patents

Abstract

The utility model discloses a cast-in-place UHPC bridge floor socket joint formula connecting device relates to a road surface lays and uses connecting piece, including a plurality of mainboard and a plurality of connecting plate, the mainboard with the connecting plate is connected in turn, the mainboard with the contained angle has between the connecting plate, the mainboard with be provided with the detachable fly leaf on the connecting plate, the fly leaf on be provided with a plurality of reinforcing bar passageway. Compared with the prior art, the socket joint type connecting device can improve mutual engaging force between adjacent UHPC bridge deck slab connection joints, improve joint strength between the UHPC bridge deck slabs, avoid the problems of fracture and gap at the joint of the bridge deck slabs, and improve the integral stress performance of the bridge deck structure. The steel formwork which is quickly assembled is adopted for pouring, and the rubber sealing strips are used for filling joints, so that the utilization rate of the mold is improved, the construction cost is reduced, the pouring size is more flexible, the appearance of the pouring result is more perfect, and the safety is relatively high.

Description

Cast-in-place UHPC bridge floor socket joint formula connecting device

Technical Field

The utility model relates to a road surface is laid and is used connecting piece.

Background

The bridge deck is used as an important component of a bridge structure, not only bears the direct action of vehicle load, but also provides a working surface for a pavement structure on the bridge deck, and is the most direct member influenced by adverse factors such as overload, corrosion, fatigue and the like, so that the service life of a bridge main body structure and the driving comfort are directly influenced by the working state of the bridge deck. In the traditional steel-concrete bridge deck slab combined structure, the bridge deck slab is made of common concrete, and the tensile strength of the concrete is low, so that the thickness of the slab is large, the self weight of the structure is large, the slab is easy to crack near a wet joint, a negative bending moment area, a cold joint area and the like, and the service life of a bridge main body structure and a pavement structure is influenced. The UHPC concrete has the advantages of high elastic modulus, high compression resistance, high tensile strength, good creep property and the like, the structure size can be reduced, the self weight of the structure is reduced, the structural load resistance effectiveness and the spanning capability are improved, and a good working surface is provided for a pavement structure.

Because of the particularity of UHPC materials, the cast-in-place operation of the bridge deck slab generally adopts a small mixer to carry out cast-in-place and mixing, and is synchronously matched with the small mixer to carry out paving operation, so the mechanization degree is low, the construction speed is slow, and the treatment of cold construction joints becomes the technical problem of the construction of the UHPC cast-in-place bridge deck slab. At present, the traditional method is to keep the tongue-and-groove-shaped seam, and to ensure that the construction surface is vertical to the bridge span direction, and the tongue-and-groove length is generally 40 cm. The method has the advantages of poor joint connection effect, weak bonding property, and easy generation of fine gaps due to incomplete construction treatment, thereby causing the generation of transverse cracks under the action of load in the later period.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to not enough among the prior art, provide a cast-in-place UHPC bridge floor socket joint formula connecting device, this device has improved the joint strength between the UHPC decking, has avoided the decking fracture, has the problem in space in the junction to appear, improves the whole atress performance of bridge floor structure. The steel template which is quickly assembled is adopted for pouring, and the rubber sealing strips are used for filling joints, so that the utilization rate of the mold is improved, the construction cost is reduced, the pouring size is more flexible, the appearance of the pouring result is more perfect, and the safety is relatively high.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve: a cast-in-place UHPC bridge floor socket joint formula connecting device, includes a plurality of mainboard and a plurality of connecting plate, the mainboard with the connecting plate is connected in turn, the mainboard with have the contained angle between the connecting plate, be provided with detachable fly leaf on mainboard and the connecting plate, the fly leaf on be provided with a plurality of reinforcing bar passageway.

Preferably among the above-mentioned technical scheme, the reinforcing bar passageway include the clearing hole and set up the installation opening under the clearing hole, the installation opening on be provided with the detachable mounting panel.

Preferably, in the above technical solution, the through hole and the mounting opening are provided with a sealing strip, and one end of the mounting plate facing the through hole is provided with a sealing strip.

Preferably, in the above technical solution, the main plate, the connecting plate, and the movable plate are made of steel.

Preferably, in the above technical solution, the main boards are parallel to each other.

In this application UHPC bridge deck plate segmentation cast-in-place forms, and segmentation cast-in-place's adjacent UHPC bridge deck plate unit adopts key dentate socket joint formula connecting device. The key-tooth socket type connecting device can be a trapezoidal connector or a rectangular connector. The trapezoidal joint or the rectangular joint can improve the mutual engagement force between the adjacent UHPC bridge deck plate bearing joints, and reduce or even eliminate the problems of reduced tensile strength, untight connection and the like at the joint caused by UHPC self-contraction, bridge deck plate fracture and the like. And the socket joint type connecting device is made of combined steel dies which can move up and down and can replace wood dies for recycling. The combined steel die has the advantages that: the steel template can meet higher construction load requirements and concrete appearance quality requirements; the reusable combined steel mould can be used for quick assembly, and the main plate can replace sub steel templates with different apertures and intervals, so that the pouring requirement of various sizes is met; the template has small adsorption force and is easier to demould; the turnover frequency is more, and the turnover time can be more than 50 times generally; the steel template has low loss and long service life; the heat preservation treatment is easy to be carried out, and the heat preservation and maintenance of the construction concrete in winter are facilitated; the device is convenient to disassemble and assemble and convenient to maintain, and can repair the local damaged surface on site.

And meanwhile, a rubber ring is adopted to replace a steel mould foam filler. The traditional seam splicing method is characterized in that polyurethane foam is injected into the seam between two adjacent steel templates and the concrete seam between the steel template and the root by using a special spray gun to tightly fill the seam between the steel template and the root of the steel template. The polyurethane foam gap filler is harmful to human bodies, and has potential safety hazards of explosion after high-temperature exposure. Meanwhile, foam expands and is exposed unattractive after the foam joint mixture is filled, the foam joint mixture easily enters a wall body through a gap to pollute a steel bar, the foam before curing needs to be removed by using a special cleaning agent, the foam after curing is difficult to peel, and holes appear in the concrete after the form is removed due to the unclean cleaning. This application adopts the rubber seal strip leakproofness of caulking good, and the size is changeable, can ensure performance, can repeat repetitious usage, and to the concrete not damaged of pouring, level and smooth pleasing to the eye, healthy environmental protection.

Compared with the prior art, the UHPC bridge deck pavement method has the advantages that the initial setting time is shorter, the strength is increased more quickly, the tensile strength can be better enhanced, and the longitudinal and transverse elevation line shapes of the bridge can be controlled. Socket joint formula connecting device in this application can improve the mutual interlock power between the adjacent UHPC decking coupling joint, improves the joint strength between the UHPC decking, has avoided the decking to appear the fracture, have the problem in space in the junction, improves the whole atress performance of bridge floor structure. The steel formwork which is quickly assembled is adopted for pouring, and the rubber sealing strips are used for filling joints, so that the utilization rate of the mold is improved, the construction cost is reduced, the pouring size is more flexible, the appearance of the pouring result is more perfect, and the safety is relatively high.

Drawings

Fig. 1 is a partial schematic view of the middle socket type connecting device of the present invention.

Detailed Description

Example 1, as shown in fig. 1, a cast-in-place UHPC composite girder bridge deck and a construction method thereof includes the following steps.

Installing shear nails: the method comprises the following steps of processing the steel box girder in a steel box girder production base according to a steel box girder construction drawing, dividing the steel box girder into sections according to the construction drawing and an optimized design, processing the steel box girder according to the sections, and transporting the steel box girder to a site for splicing and welding. The welding nails are cylindrical head welding nails with the specification of phi 10x40, the welding nail spacing is 20cm, the thickness of the UHPC bridge deck is 6cm, and the welding nails are connected with the steel bridge deck through shear nails. The bridge deck is polished and derusted before welding, lofting and positioning are carried out according to construction drawings, ink lines are used for marking (latticed) on the bridge deck of the steel box girder, in order to ensure installation quality and construction precision control, an RSN series high-grade stud welding machine is adopted for construction operation, the requirement of single-point welding time is more than or equal to 0.7 second, the requirement of melting contact surfaces of stud feet and the steel box girder is more than or equal to 4mm, the stud gun is lifted after electric arc stops, welding slag is cleaned up, and a finished product is full and radial marks after welding is finished. And (3) performing clinch inspection after welding is finished, performing a tensile test according to the requirements of cylindrical head welding nails for arc stud welding (GB/T10433), and performing the next procedure construction after the requirements are met. The welding quality control of the shear nails has great influence on the connectivity of the bridge deck and the bridge body, the weld legs are required to be full and are more than or equal to 4mm, and the raw materials and related test data meet the requirements of design and specification.

Installing a reinforcing mesh: 1. and (4) processing the steel bars, wherein steel bar workers should be familiar with drawings to sample the steel bars according to the design requirements of the drawings, and can pay the steel bar workers to discharge the steel bars after the sampling is finished. In the process of blanking the reinforcing steel bars, the quality is strictly closed. And the quality worker needs to randomly check the background blanking length and compare the background blanking length with the length of the steel bar worker's long material list, and needs to make again if the error is larger than the standard requirement. The position, length and specification of the finished product should be marked. 2. The reinforcing steel bar is installed, and the reinforcing steel bar is installed on the scene, adopts the ligature connection, for better control reinforcing steel bar installation interval and precision, local adoption spot welding location. And (4) drawing the intervals of the steel bars on the steel bridge surface by chalk according to the design requirement, and connecting one by one. The binding connection of the steel bars requires that the binding wires extend to the lower bridge deck side, so that the UHPC pouring surface is prevented from being exposed. Before the steel bar is welded, the steel bar needs to be welded according to construction conditions, and after the steel bar is qualified, formal welding can be carried out. The welder must take the examination certificate to post. The protective layer takes the thickness control of the upward protective layer as a standard, the thickness of the reinforced concrete protective layer at the outermost side is not less than 25mm, and when the steel bar collides with the embedded parts and the steel bar in the reserved range of the telescopic device and the handrail, the local steel bar can be properly adjusted. In order to ensure that mechanical equipment and personnel in the later period trample and roll the reinforcing steel bars after installation and damage, a traffic lane is laid on one side, the contact surface is widened, and local damage is avoided. In consideration of the fact that personnel and equipment walk on the steel bar net during construction, a construction access road is paved, damage to a steel bar layer of an unfixed section is reduced, and the bridge deck is ensured to be accurate in elevation.

And (3) sectional formwork support and UHPC processing: because of the characteristics of the steel UHPC bridge deck pavement material, the fluidity is large, the initial setting is fast, the equipment mixing production condition is limited, and the steel UHPC bridge deck pavement material needs to be mixed and used at the site, the sectional formwork erecting pouring construction is adopted according to the site operation surface and the construction condition. The UHPC concrete is stirred by adopting 2 forced UHPC mixers with the length of 1m3, qualified raw materials are determined and selected according to relevant tests and detection of UHPC materials prepared in a test room, the mix proportion of the concrete is designed and tested, and the mix proportion of the concrete in the test room and the construction mix proportion are finished according to the strength requirement of the concrete design so as to meet the requirement of the construction process. Attention is paid to the quality control of UHPC raw materials, the metering deviation of powder, steel fiber and water of each plate should not exceed 1%, the error of stirring time is controlled within 10s, and meanwhile, the time control of the transportation process and the pouring process is well done, so that the quality of the raw materials is guaranteed. Due to the high strength characteristic of the UHPC in the later period and the complex rework, the bridge deck elevation recheck needs to be done, accurate measurement needs to be carried out before each section construction, and the elevation is ensured to be correct.

In order to increase the contact area of the contact construction joint and strengthen the connection of new and old poured UHPC, the construction joint is kept in a tooth shape and a socket joint type connecting device is arranged. The socket type connecting device comprises a plurality of main boards 1 and a plurality of connecting boards 2, wherein the main boards 1 and the connecting boards 2 are alternately connected, the main boards are parallel to each other, and an included angle is formed between each main board 1 and the corresponding connecting board 2, so that the main boards have continuous trapezoidal bulges or square bulges. The main plate 1 and the connecting plate 2 are provided with detachable movable plates 3, and if the steel bars are not dense, the connecting plate 2 is not provided with the detachable movable plates 3. The movable plate 3 is provided with a plurality of steel bar channels. The reinforcing steel bar channel comprises a through hole 5 and a mounting opening arranged below the through hole, wherein a detachable mounting plate 6 is arranged on the mounting opening. If the movable plate 3 can be left in place, only the hole 5 is needed on the movable plate 3. The clearing hole the installation opening be provided with the sealing strip, the mounting panel towards the one end of clearing hole is provided with the sealing strip. The connecting plate and the movable plate are made of steel.

And (3) carrying out UHPC transportation and pouring on the bridge deck, wherein according to the characteristics of UHPC raw materials, the pouring speed is required to be high, and the maintenance is required to be in time, so that the UHPC is mixed on the bridge on site and then is transported and poured by using a forklift loading hopper, and each hopper is about 0.8 square according to the size of the hopper. The transportation time is shortened, the uniformity of the UHPC concrete is kept in the transportation process, and various working performance indexes are not obviously fluctuated, and heat preservation and insulation measures are adopted for the hopper to prevent the temperature of the local concrete from rising (in summer) or being frozen (in winter). Appropriate measures should be taken to prevent moisture from entering the transport container or evaporating. Pouring of UHPC materials discharged after each mixing needs to be completed within 15min, and leveling and follow-up maintenance are completed within 30 min. Before pouring, surveying the elevation of the top of the bridge deck again by a measurer, arranging balance beams on two sides of the viaduct beam, making corresponding marks every 5m, butting the balance beams and the steel wire ropes with a field working head, controlling the elevation of the bridge deck by using the balance beams and the steel wire ropes, fixing the steel wire ropes on one side of the bridge center and the steel wire ropes on the other side of the bridge edge, and controlling the elevation of the top surface of the UHPC according to the height of the steel wire ropes. The whole UHPC bridge floor pouring sequence is poured from the midspan to the two end supports along the bridge direction, considering the elimination of the pre-camber of the large-span bridge under the action of the second-stage transverse load, 15m is reserved on each of the two sides of the middle support to be used as post-pouring belt post-pouring, so that the line shape of the bridge floor along the bridge direction can be conveniently adjusted, the longitudinal slope error can be reduced, and the UHPC bridge floor along the transverse bridge direction is poured from the top of the slope to the bottom of the slope. Before each section of UHPC is poured, the tooth-shaped construction joint left by the upper section of UHPC in pouring needs to be subjected to scabbling wetting treatment, then the lower section pouring construction can be carried out, in order to facilitate the scabbling treatment of the construction joint, a tooth-shaped joint template is chiseled within 2h after being dismantled, and the problem that the scabbling construction is difficult due to overhigh strength of the UHPC is solved. In order to avoid the fall at the UHPC joint, the joint is flattened by a roller after pouring is finished, and the flatness of the bridge deck is kept. Due to the large fluidity of the material, vibration type construction is forbidden to be carried out near the pouring section within 2 hours after pouring is finished, so that UHPC flowing is avoided, and elevation control is not influenced.

And (3) maintaining the UHPC bridge deck, namely covering and maintaining the UHPC bridge deck by adopting a plastic film within 30min after the pouring of the UHPC bridge deck is finished, reducing water evaporation, and preventing a drying shrinkage crack from occurring, wherein the transverse lap joint of two films is not less than 50cm, and the lap joint in the longitudinal direction is not less than 20 cm. After the film is covered, a watering can is adopted for spraying and maintaining, and water can not be enclosed for maintaining. During winter construction, the large-span bridge is generally not shielded, and the wind is strong and the temperature is reduced violently, so that cotton quilt cover should be additionally paved in time after the covering film is sprayed with water, and temperature shrinkage cracks are prevented. UHPC early strength rises fast, and the conjunctiva speed is fast, therefore the maintenance follow-up after pouring is very crucial, need follow-up maintenance within 30min after pouring is accomplished, avoid the shrink-drying to lead to the fact the surface to produce the crackle, and then influence its performance.

Claims (5)

1. A cast-in-place UHPC bridge floor socket joint formula connecting device, includes a plurality of mainboard and a plurality of connecting plate, characterized in that, mainboard and connecting plate are connected in turn, have the contained angle between mainboard and the connecting plate, mainboard and be provided with the detachable fly leaf on the connecting plate, the fly leaf on be provided with a plurality of reinforcing bar passageway.

2. A cast-in-place UHPC deck spigot and socket connection as claimed in claim 1, wherein said rebar channel comprises a pass-through hole and a mounting opening disposed below said pass-through hole, said mounting opening having a removable mounting plate disposed thereon.

3. A cast-in-place UHPC deck socket connection according to claim 2, wherein the through hole, the mounting opening are provided with a sealing strip and the end of the mounting plate facing the through hole is provided with a sealing strip.

4. A cast-in-place UHPC deck socket connection according to claim 1, wherein the main plate, the connecting plate and the moving plate are made of steel.

5. A cast-in-place UHPC deck socket connection according to claim 1, characterised in that said main panels are parallel to each other.

Images