Prefabricated groove-shaped bridge end transition slab

Abstract

The utility model discloses a prefabricated groove-shaped bridge end transition slab, and relates to the technical field of bridge engineering. Comprising a rectangular butt strap body, a plurality of butt strap grooves formed in the length direction are formed in the top of the butt strap body, and stud preformed holes are formed in the end, close to a bridge abutment, of the butt strap body and matched with embedded studs on the bridge abutment; a plurality of anchor bolt reserved holes are symmetrically formed in the two sides of the butt strap bodies, and every two adjacent butt strap bodies are connected through transverse connecting anchor bolts arranged in the anchor bolt reserved holes in a penetrating mode. The butt strap body is embedded below a pavement base layer. The construction mode of prefabrication in a factory and on-site installation is adopted, transformation and upgrading of the construction mode of the bridge end transition slab are achieved, the engineering quality is improved, the construction speed is increased, the formwork amortization and construction cost is reduced, meanwhile, the transition slab is buried below a pavement base layer, and reflection cracks at the joint of the transition slab and a roadbed can be restrained easily.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a prefabricated assembled groove-shaped bridge head slab. Background Art

[0002] The bridgehead slab is a reinforced concrete slab placed between the abutment and the roadbed fill. It is a measure taken to prevent the bridge-road transition section from settling. The bridgehead slab can rotate with the settlement of the fill, and can play a buffering role when vehicles are driving. Even if the fill behind the abutment settles, it will not cause large unevenness on the road surface. One of the most widely used technical measures at present is to reduce or partially eliminate the bridgehead jump by setting up the bridgehead slab.

[0003] At present, bridge slabs are mostly cast-in-place reinforced concrete slabs, located below the road surface. Due to the shallow depth of the slabs and the poor geological conditions at the bridge head, reflective cracks are very likely to appear at the junction of the slabs and the roadbed. On the other hand, bridge slabs are mostly cast-in-place, which has the disadvantages of long construction period, poor on-site casting quality and large workload, and does not conform to the development concept of industrialized construction of bridge products.

[0004] Therefore, a prefabricated and assembled trough bridgehead slab structure is proposed, which adopts the construction method of prefabrication in the factory and installation on site of ultra-high performance concrete (UHPC), so as to realize the transformation and upgrading of the construction method of bridgehead slab, improve the engineering quality, speed up the construction speed, reduce the template amortization and construction cost. At the same time, the slab is buried under the pavement base, which is conducive to suppressing the reflective cracks at the junction of the slab and the roadbed. Utility Model Content

[0005] The main purpose of the utility model is to provide a prefabricated assembled groove-shaped bridge head slab to solve the above problems.

[0006] To achieve the above-mentioned purpose, the utility model provides a prefabricated and assembled trough-shaped bridge head scaffolding, including a rectangular scaffolding body, a plurality of scaffolding grooves arranged along the length direction are opened on the top of the scaffolding body, and bolt pre-holes are provided at one end of the scaffolding body close to the abutment, and the bolt pre-holes are adapted to the embedded bolts on the abutment; a plurality of anchor bolt pre-holes are symmetrically provided on both sides of the scaffolding body, and two adjacent scaffolding bodies are connected by transverse connecting anchor bolts penetrated through the anchor bolt pre-holes; the scaffolding body is buried below the pavement base.

[0007] Furthermore, the slab body is made of ultra-high performance concrete.

[0008] Furthermore, a shearing tooth key is arranged on one side of the butt plate body, and a groove matched with the shearing tooth key is arranged on the other side.

[0009] Furthermore, the shear teeth and grooves are arranged to have the same length as the butt plate body.

[0010] Furthermore, the anchor bolt reserved hole is an oblong hole.

[0011] Furthermore, the spacing between the anchor bolt reserved holes is 1000 mm.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model has a simple structure and clear force;

[0014] 2. The utility model adopts prefabricated assembly construction, which is convenient and fast;

[0015] 3. The utility model uses ultra-high performance concrete (UHPC) material, with a ribbed thin plate structure, and the components are light and convenient for on-site assembly;

[0016] 4. The utility model is buried below the road base, which is conducive to suppressing the reflective cracks at the junction of the slab and the roadbed;

[0017] 5. The utility model has small engineering volume, energy saving and environmental protection;

[0018] 6. The utility model is easy to replace and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic elevation diagram of a prefabricated and assembled trough-shaped bridgehead slab proposed by the utility model;

[0020] Figure 2 This is a top plan schematic diagram of a prefabricated assembled trough-shaped bridge head slab proposed by the utility model;

[0021] Figure 3 This is a schematic diagram of the assembly of a prefabricated trough-shaped bridge head slab proposed by the utility model;

[0022] Figure 4 This is an enlarged view of the assembly position of a prefabricated assembled trough-shaped bridge head slab proposed by the utility model;

[0023] Figure 5 The utility model provides a construction schematic diagram of a prefabricated assembled trough-shaped bridge head slab.

[0024] In the figure: 1- the main body of the slat; 2- the groove of the slat; 3- the reserved hole for bolts; 4- the reserved hole for anchor bolts; 5- the shear tooth key; 6- the groove; 7- the transverse connecting anchor bolt; 8- the surface layer of the road surface; 9- the base layer of the road surface; 10- the subbase layer of the road surface; 11- the roadbed filling material; 12- the crushed stone sand; 13- the abutment; 14- the embedded bolts. DETAILED DESCRIPTION

[0025] In order to achieve the above-mentioned purpose and effect, the technical means and structure adopted by the utility model are described in detail with reference to the accompanying drawings for the preferred embodiments of the utility model and their features and functions.

[0026] As attached Figure 1-5 As shown, the utility model provides a prefabricated assembled trough-shaped bridgehead scaffolding, including a rectangular scaffolding body 1 with a width of 2 to 2.5 m, a length of 6 to 8 m, and a height of 250 to 350 mm. The top of the scaffolding body 1 is provided with a plurality of scaffolding grooves 2 arranged along the length direction (ensuring that the bottom plate thickness is between 70 and 100 mm), and the end of the scaffolding body 1 close to the abutment is provided with a bolt pre-hole 3 with a diameter of φ40 mm, and the bolt pre-hole 3 is adapted to the embedded bolt 14 on the abutment 13; a plurality of anchor bolt pre-holes 4 are symmetrically arranged on both sides of the scaffolding body 1, and the spacing between the anchor bolt pre-holes 4 is 1000 mm, and two adjacent scaffolding bodies 1 are connected by transverse connecting anchor bolts 7 penetrated through the anchor bolt pre-holes 4; the scaffolding body 1 is buried below the pavement base 9, and since the scaffolding is buried deeper, the reflective cracks at the junction of the scaffolding and the roadbed can be effectively suppressed.

[0027] The slab body 1 is made of ultra-high performance concrete; after 28 days of standard curing, the compressive strength is required to be ≥120MPa, the axial tensile strength is ≥8MPa, the flexural strength is ≥22MPa, and the elastic modulus is ≥40GPa.

[0028] A shear tooth key 5 is provided on one side of the strap body, and a groove 6 matched with the shear tooth key 5 is provided on the other side. The shear tooth key 5 and the groove 6 are both provided with the same length as the strap body 1, so that the strap bodies 1 are reliably connected.

[0029] The anchor bolt reserved hole 4 is an oblong hole, which is convenient for the insertion and local adjustment of the transverse connecting anchor bolt 7.

[0030] The main construction process is as follows:

[0031] 1. Determine the structural dimensions and reinforcement of the bridgehead slab

[0032] According to the relevant provisions of the General Specification for Design of Highway Bridges and Culverts (JTG D60), the load level of the slab is determined, so as to carry out the structural size and reinforcement design of the slab.

[0033] 2. Factory prefabricated slabs

[0034] The prefabrication plant makes steel skeletons and steel formwork according to the slab design drawing, hoists the made steel skeleton into the formwork, and pours the UHPC. After removing the formwork and curing for 7 days, the prefabricated slab is hoisted off the bottom formwork and moved to the designated storage area.

[0035] 3. On-site installation of boarding

[0036] After the roadbed behind the abutment is completed, the slats are installed according to the predetermined position, so that the shear teeth 5 and the grooves 6 between the slats are engaged with each other, the embedded bolts 14 are inserted, and the transverse connecting anchor bolts 7 are installed between the slats, and then the slat grooves 2 are filled with crushed sand.

[0037] 4. Construct road base layer 9 and road surface layer 8.

[0038] 5. After passing the inspection, the project is completed.

[0039] The utility model adopts the construction method of prefabrication of ultra-high performance concrete (UHPC) in the factory and installation on site, realizing the transformation and upgrading of the construction method of the bridge head slab, improving the quality of the project, speeding up the construction speed, reducing the template amortization and construction cost. At the same time, the slab is buried under the road base, which is conducive to suppressing the reflective cracks at the junction of the slab and the roadbed.

[0040] The above description is only the preferred embodiment of the utility model, not all embodiments. Anyone should be aware that structural changes made under the inspiration of the utility model, and all technical solutions that are the same or similar to the utility model, belong to the protection scope of the utility model.

Claims

1. A prefabricated trough-shaped bridge head slab, characterized in that: It includes a rectangular scaffolding body, a plurality of scaffolding grooves arranged along the length direction are opened on the top of the scaffolding body, a bolt reserved hole is arranged at one end of the scaffolding body close to the abutment, and the bolt reserved hole is adapted to the embedded bolts on the abutment; a plurality of anchor bolt reserved holes are symmetrically arranged on both sides of the scaffolding body, and two adjacent scaffolding bodies are connected by transverse connecting anchor bolts penetrated through the anchor bolt reserved holes; the scaffolding body is buried below the pavement base.

2. The prefabricated trough-shaped bridgehead slab according to claim 1, characterized in that: The slab body is made of ultra-high performance concrete.

3. A prefabricated trough-shaped bridgehead slab as claimed in claim 1 or 2, characterized in that: One side of the butt plate body is provided with a shearing tooth key, and the other side is provided with a groove matched with the shearing tooth key.

4. The prefabricated trough-shaped bridgehead slab according to claim 3, characterized in that: The shear teeth and grooves are arranged with the same length as the butt plate body.

5. A prefabricated and assembled trough-shaped bridgehead slab as claimed in claim 1, 2 or 4, characterized in that: The anchor bolt reserved hole is an oblong hole.

6. The prefabricated trough-shaped bridgehead slab according to claim 5, characterized in that: The spacing between the anchor bolt reserved holes is 1000mm.

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