CN105442457B - Construction structure and method for extending bridge floor plate bridge filled with fine sand - Google Patents

Abstract

The invention relates to a construction structure and construction method of an extended deck bridge filled with fine sand. The structure includes an abutment, and a support for supporting a main girder is installed on the abutment abutment; Filling behind the abutment, the gap between the bottom surface of the main girder and the top surface of the abutment body is provided with a first formwork, the gap between the side of the main girder and the inner surface of the abutment block is provided with a second formwork, and the abutment block A third formwork is erected on the block, and the first formwork, the second formwork and the third formwork make the bottom surface of the main girder, the side of the main girder, the top surface of the abutment body, the inner side of the abutment block and the front side of the abutment back wall Enclosing a filling space, the filling space is filled with fine sand from the gap between the end of the main girder and the front side of the abutment back wall, and a layer of sliding material is arranged on the fine sand, the abutment back wall and the filling soil behind the abutment , the sliding material is poured with an extended bridge deck. The invention uses fine sand that can be removed after filling as a temporary support for pouring the extended bridge deck, effectively avoiding construction problems.

Description

Construction structure and construction method of extended bridge deck bridge filled with fine sand

technical field

The invention relates to a construction structure and a construction method of an extended deck bridge filled with fine sand.

Background technique

The jumping caused by the bridge expansion joints and the secondary adverse effects caused by the damage of the expansion joints (such as the additional internal force of the structure, the corrosion of the structure due to water leakage, etc.) are the thorny problems often encountered in the actual operation of bridges at home and abroad question. The bridge head jumping caused by the telescopic device not only has a great impact on the bridge and the road surface, but also reduces the driving comfort of the driver and passengers. In addition, as the traffic flow increases day by day, the maintenance and replacement of the telescoping device will often cause serious traffic interruptions, resulting in huge economic losses. It can be seen that it is imperative to solve a series of problems caused by bridge expansion joints. For the solution to the problem of expansion joints, there are usually the following two ideas: one is to improve the expansion device, but it does not completely eliminate the maintenance and replacement of the expansion device, which is a temporary solution, not the root cause; the other is to reduce the bridge deck expansion device or cancel the bridge The telescopic device fundamentally solves the problem of the telescopic device.

At present, the common seamless bridges in the world include integral bridges, semi-integral bridges and extended deck bridges, among which extended deck bridges have the widest application range. Extended deck bridges refer to seamless bridges with extended deck abutments. Extended bridge deck abutment refers to the abutment where the bridge deck crosses the expansion joint between the back wall and the main girder, and connects with the back wall or crosses the back wall and connects with the lead plate. There are still expansion joints between the main girder and the back wall of the abutment, but there are no expansion joints or expansion devices on the bridge deck. For extended deck bridges, the restrained rigidity of the main girder in the longitudinal bridge direction is small, so the axial elastic deformation of the main girder caused by temperature changes is very small, and the expansion and contraction of the girder body is mainly guided to the junction with the approach road by the extended deck deck . Compared with ordinary bridges with seams, the extended deck seamless bridge can reduce the construction and maintenance costs of the bridge, simplify the construction of the bridge, improve the driving performance of the bridge, and improve the durability and seismic performance of the bridge.

For the extended deck deck in the extended deck bridge, if the traditional construction method is adopted, traditional wood formwork or steel formwork needs to be laid as the base form for pouring the extended deck concrete on site. However, after the concrete is poured, the bottom formwork cannot be dismantled, which not only causes a waste of material resources, but also the formwork exists permanently as a redundant component, which may cause hidden dangers of abnormal stress on the joints. If the traditional wooden formwork or steel formwork is not laid as the bottom formwork, the concrete will easily fall from the expansion joint between the abutment back wall and the main girder during the concrete pouring process of the extended bridge deck, making it impossible to complete the concrete pouring of the extended bridge deck . If flexible materials such as asphalt felt and galvanized sheet are used as the base form, due to the insufficient rigidity of the flexible material, the weight of the concrete itself and the impact of the on-site vibration process, it is easy to cause the bottom surface of the extended bridge deck at the expansion joint between the abutment back wall and the main girder. Concrete partially or completely blocks the expansion joint between the back wall of the abutment and the main girder, thereby affecting the longitudinal expansion and contraction of the main girder of the extended deck bridge, resulting in additional tension on the main girder and the extended deck deck. cracking.

Contents of the invention

In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a convenient and reliable construction structure and construction method of an extended deck bridge filled with fine sand.

In order to solve the above problems, a technical solution of the present invention is: a construction structure of an extended deck bridge filled with fine sand, including an abutment composed of an abutment body, an abutment back wall and an abutment block. The abutment body is equipped with a support for supporting the main girder, the rear side of the abutment is provided with backfill, and the gap between the bottom surface of the main girder and the top surface of the abutment body is installed in front of the top of the abutment body. The first formwork at the edge, the gap between the side of the main girder and the inner side of the abutment block is erected with the second formwork at the front edge of the inner side of the abutment block, and the abutment block is erected with a The third template of the abutment back wall, the first template, the second template and the third template make the bottom surface of the main girder, the side of the main girder, the top surface of the abutment body, the inner side of the abutment block and the front side of the abutment back wall Enclose a filling space, the filling space is filled with fine sand from the gap between the end of the main girder and the front side of the abutment back wall and compacted, the fine sand between the end of the main girder and the front side of the abutment back wall 1. On the abutment back wall and the filling soil behind the abutment, there is a layer of sliding material used as the cast-in-place bottom form, and a layer of reinforced concrete is poured on the sliding material to form the extended bridge deck.

In a further preferred solution, the top surface of the third template is flush with the top surface of the abutment back wall.

In a further preferred solution, the compacted top surface of the fine sand between the end of the main girder and the front side of the abutment back wall is flush with the top surface of the abutment back wall.

In a further preferred solution, the sliding material is felt or galvanized sheet.

In a further preferred solution, the abutment abutment body, abutment back wall and abutment stop block form an integral abutment by prefabricated hoisting or in-situ casting.

In a further preferred solution, the main girder is arranged on the support by prefabricated hoisting or in-situ casting.

In a further preferred solution, the first formwork, the second formwork and the third formwork are removed after the concrete strength of the extended bridge deck meets the requirements.

In a further preferred solution, the fine sand is removed after the first template, the second template and the third template are removed.

In order to solve the above problems, another technical solution of the present invention is: a construction method of an extended bridge deck bridge filled with fine sand, which is carried out according to the following steps:

(1) The abutment body, the abutment back wall and the abutment stopper shall be cast in-situ or prefabricated by ordinary reinforced concrete for hoisting and positioning to form the abutment; after the concrete strength meets the design requirements, install supports on the top surface of the abutment body; According to the construction specification, the permeable backfill is used to fill and compact the back of the abutment;

(2) The main girder is positioned on the support by prefabricated hoisting or on-site casting and forming on the support according to the design requirements;

(3) Set up the first formwork at the gap between the bottom of the main girder and the front edge of the top of the abutment body, set up the second formwork at the gap between the side of the main girder and the front edge of the inner side of the abutment block, and erect the formwork on the abutment block The third formwork that is flush with the top surface of the abutment back wall makes a filling space surrounded by the bottom surface of the main girder, the side of the main girder, the top surface of the abutment body, the inner side of the abutment block and the front side of the abutment back wall;

(4) Fill the filling space with fine sand from the gap between the end of the main girder and the front side of the abutment back wall and compact it, so that the fine sand between the end of the main girder and the front side of the abutment back wall is compacted. The top surface is flush with the top surface of the back wall of the abutment;

(5) On the fine sand between the end of the main girder and the front side of the back wall of the abutment, the back wall of the abutment and the filling soil behind the abutment, a layer of sliding material is arranged as a slipping material for the cast-in-place bottom form to form a sliding surface to ensure The longitudinal deformation and movement of the bridge deck system under the temperature change;

(6) Bind the slab reinforcement on the sliding material and pour concrete on site to form the extended bridge deck;

(7) When the concrete strength of the extended bridge deck meets the design requirements, the first formwork, the second formwork and the third formwork shall be removed first, and then the filled fine sand shall be removed.

Compared with the prior art, the present invention has the following beneficial effects: the filling and clearing of the gap between the abutment back wall and the main girder can be realized by utilizing the characteristics that the fine sand is loose under natural conditions and the internal frictional resistance is small; The sand has high strength, easy compaction, and high stability to fully fill the gap between the abutment back wall and the main girder as a temporary support for pouring the concrete of the extended bridge deck; compared with the previous engineering technology, the extended bridge filled with fine sand The construction structure and construction method of the deck bridge effectively avoid various construction problems, and are suitable for the construction of the main girder-abutment back wall-back slab joint of the extended bridge deck seamless bridge.

Description of drawings

Figure 1 is a schematic diagram of the structure of the abutment after construction.

Figure 2 is a schematic diagram of the longitudinal section of the overlapping structure of the abutment and the main girder.

Figure 3 is a schematic side view of the overlapping structure of the abutment and the main girder.

Figure 4 is a schematic plan view of an extended deck bridge filled with fine sand.

Figure 5 is a schematic cross-sectional view of the construction structure of the extended deck bridge filled with fine sand.

Fig. 6 is a schematic plan view of the construction step (1) of the extended deck bridge filled with fine sand.

Fig. 7 is a schematic plan view of the construction step (2) of the extended deck bridge filled with fine sand.

Fig. 8 is a schematic plan view of the construction step (3) of the extended deck bridge filled with fine sand.

Fig. 9 is a schematic plan view of the construction step (4) of the extended deck bridge filled with fine sand.

Fig. 10 is a schematic plan view of the construction step (5) of the extended deck bridge filled with fine sand.

Fig. 11 is a schematic plan view of the construction step (6) of the extended deck bridge filled with fine sand.

Markings in the figure: 1- abutment body, 2- abutment back wall, 3- support, 4- filling soil behind the abutment, 5- main girder, 6- abutment block, 7- first formwork, 8- Second formwork, 9-third formwork, 10-fine sand, 11-slip material, 12-extended bridge deck.

detailed description

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

As shown in Figures 1 to 11, a construction structure of an extended deck bridge filled with fine sand includes an abutment composed of an abutment body 1, an abutment back wall 2 and an abutment block 6, the bridge The abutment body 1 is equipped with a support 3 supporting the main girder 5, and the rear side of the abutment is provided with a backfill 4, and the gap between the bottom surface of the main girder 5 and the top surface of the abutment body 1 is provided with a bridge The first template 7 at the front edge of the top of the platform body 1, the gap between the side of the main girder 5 and the inner side of the abutment block 6 is provided with a second template 8 at the front edge of the inner side of the abutment block 6, the The abutment block 6 is erected with a third formwork 9 close to the abutment back wall 2, the first formwork 7, the second formwork 8 and the third formwork 9 make the bottom surface of the main girder 5, the sides of the main girder 5, the bridge The top surface of the abutment body 1, the inner side of the abutment block 6 and the front side of the abutment back wall 2 form a filling space, and the filling space is filled from the gap between the end of the main girder 5 and the front side of the abutment back wall 2 The fine sand 10 is compacted, and a layer is arranged on the fine sand 10 between the end of the main girder 5 and the front side of the abutment back wall 2, the abutment back wall 2 and the backfilling soil 4 as a cast-in-place bottom form. A layer of reinforced concrete is poured on the sliding material 11 to form an extended bridge deck 12 .

In the embodiment of the present invention, in order to facilitate the construction of the sliding material 11, the top surface of the third template 9 is flush with the top surface of the abutment back wall 2, and the end of the main girder 5 is in line with the front side of the abutment back wall 2. The compacted top surface of the fine sand 10 between is also flush with the abutment back wall 2 top surface. The sliding material 11 is preferably made of asphalt felt or galvanized sheet, but it is not limited thereto, and of course other flexible materials can also be used.

In the embodiment of the present invention, the abutment body 1, the abutment back wall 2 and the abutment block 6 can form an integral abutment by prefabricated hoisting or cast-in-place; the main girder 5 can be hoisted by prefabricated Or it is arranged on the support 3 by pouring in situ.

In the embodiment of the present invention, the first template 7, the second template 8 and the third template 9 are removed after the concrete strength of the extended bridge deck 12 reaches the requirement; 8 and the third formwork 9 are removed and removed.

As shown in Figures 1 to 11, a construction method of an extended bridge deck bridge filled with fine sand is carried out according to the following steps:

(1) The abutment body 1, the abutment back wall 2 and the abutment block 6 are positioned by common reinforced concrete on-site pouring or prefabricated hoisting to form the abutment; Install the support 3; according to the construction specification, use the backfill with good water permeability to carry out the backfill 4 on the back side of the abutment and compact it.

(2) The main girder 5 is positioned on the support 3 by prefabricated hoisting or on-site casting and forming on the support 3 according to the design requirements.

(3) Set up the first formwork 7 at the gap between the bottom of the main girder 5 and the front edge of the top of the abutment body 1, and set up the second formwork 8 at the gap between the side of the main girder 5 and the front edge of the inner side of the abutment block 6. On the abutment block 6, the third template 9 that is flush with the top surface of the abutment back wall 2 is erected, so that the bottom surface of the main girder 5, the side surface of the main girder 5, the top surface of the abutment body 1, the inner side of the abutment block 6 and the The front side of the abutment back wall 2 forms a filling space.

(4) Fill the filling space with fine sand 10 from the gap between the end of the main girder 5 and the front side of the abutment back wall 2 and compact it so that the fine sand 10 between the end of the main girder 5 and the front side of the abutment back wall 2 The compacted top surface of the sand 10 is flush with the top surface of the abutment back wall 2 .

(5) On the fine sand 10 between the end of the main girder 5 and the front side of the abutment back wall 2 , on the abutment back wall 2 and the backfill 4 behind the abutment, arrange a layer of sliding material 11 for the cast-in-place bottom form , forming a sliding surface to ensure the longitudinal deformation of the bridge deck under temperature changes.

(6) On the sliding material 11, tie up the slab reinforcement and pour concrete on site to form the extended bridge deck 12.

(7) When the concrete strength of the extended bridge deck 12 meets the design requirements, the first formwork 7, the second formwork 8 and the third formwork 9 are removed first, and then the filled fine sand 10 is removed.

In the embodiment of the present invention, the main girder 5 in step (2) can be prefabricated, and the prefabricated main girder 5 can be transported to the construction site through traditional transportation methods, and the main girder 5 can be installed and positioned by hoisting equipment, or it can be installed and positioned according to the design requirements. Cast in situ.

In the embodiment of the present invention, asphalt felt or galvanized sheet is preferably used as the sliding material 11 in step (5), but it is not limited thereto, and of course other flexible materials can also be used.

In the embodiment of the present invention, the step (7) may use methods such as manual removal or high-pressure water gun flushing to remove the filled fine sand 10 .

The present invention is not limited to the above-mentioned best implementation mode, anyone can draw other various forms of construction structures and construction methods of extended bridge deck bridges filled with fine sand under the enlightenment of the present invention. All equivalent changes and modifications made according to the patent scope of the present invention shall fall within the scope of the present invention.

Claims (9)

1. A kind of extension bridge deck bridge construction structure that adopts fine sand filling, comprises the abutment that is made up of abutment abutment body, abutment back wall and abutment block, and the support girder is installed on the said abutment abutment body The support, the rear side of the abutment is provided with post-abutment fill, which is characterized in that: the gap between the bottom surface of the main girder and the top surface of the abutment body is provided with a first template located at the front edge of the abutment body top, The gap between the side of the main girder and the inner side of the abutment block is provided with a second formwork located at the front edge of the inner side of the abutment block, and a third formwork close to the back wall of the abutment is erected on the abutment block , the first template, the second template and the third template make the bottom surface of the main beam, the side of the main beam, the top surface of the abutment body, the inner side of the abutment block and the front side of the abutment back wall form a filling space, so The filling space is filled with fine sand from the gap between the end of the main girder and the front side of the abutment back wall and compacted. The fine sand between the end of the main girder and the front side of the abutment back wall, the abutment back wall and the A layer of slip material used as the bottom form for pouring in-situ is arranged on the backfill, and a layer of reinforced concrete is poured on the slip material to form the extended bridge deck. 2. The construction structure of the extended deck bridge filled with fine sand according to claim 1, characterized in that: the top surface of the third formwork is flush with the top surface of the abutment back wall. 3. The construction structure of an extended deck bridge filled with fine sand according to claim 1 or 2, characterized in that: the fine sand between the end of the main girder and the front side of the abutment back wall is compacted The top surface is flush with the top surface of the back wall of the abutment. 4. The construction structure of the extended bridge deck bridge filled with fine sand according to claim 1, characterized in that: the sliding material is asphalt felt or galvanized sheet. 5. The construction structure of the extended deck bridge filled with fine sand according to claim 1, characterized in that: the abutment body, abutment back wall and abutment block are formed by prefabricated hoisting or on-site casting A whole abutment. 6. The construction structure of the extended bridge deck bridge filled with fine sand according to claim 1, characterized in that: the main girder is arranged on the support by prefabricated hoisting or in-situ casting. 7. The construction structure of the extended bridge deck bridge filled with fine sand according to claim 1, characterized in that: the first formwork, the second formwork and the third formwork are removed after the concrete strength of the extended bridge deck meets the requirements . 8. The construction structure of the extended bridge deck bridge filled with fine sand according to claim 7, wherein the fine sand is removed after the first formwork, the second formwork and the third formwork are removed. 9. A construction method for an extended bridge deck bridge that adopts fine sand filling, is characterized in that, carries out according to the following steps: (1) The abutment body, the abutment back wall and the abutment stopper shall be cast in-situ or prefabricated by ordinary reinforced concrete for hoisting and positioning to form the abutment; after the concrete strength meets the design requirements, install supports on the top surface of the abutment body; According to the construction specification, the permeable backfill is used to fill and compact the back of the abutment; (2) The main girder is positioned on the support by prefabricated hoisting or on-site casting and forming on the support according to the design requirements; (3) Set up the first formwork at the gap between the bottom of the main girder and the front edge of the top of the abutment body, set up the second formwork at the gap between the side of the main girder and the front edge of the inner side of the abutment block, and erect the formwork on the abutment block The third formwork that is flush with the top surface of the abutment back wall makes a filling space surrounded by the bottom surface of the main girder, the side of the main girder, the top surface of the abutment body, the inner side of the abutment block and the front side of the abutment back wall; (4) Fill the filling space with fine sand from the gap between the end of the main girder and the front side of the abutment back wall and compact it, so that the fine sand between the end of the main girder and the front side of the abutment back wall is compacted. The top surface is flush with the top surface of the back wall of the abutment; (5) On the fine sand between the end of the main girder and the front side of the back wall of the abutment, the back wall of the abutment and the filling soil behind the abutment, a layer of sliding material is arranged as a slipping material for the cast-in-place bottom form to form a sliding surface to ensure The longitudinal deformation and movement of the bridge deck system under the temperature change; (6) Bind the slab reinforcement on the sliding material and pour concrete on site to form the extended bridge deck; (7) When the concrete strength of the extended bridge deck meets the design requirements, the first formwork, the second formwork and the third formwork shall be removed first, and then the filled fine sand shall be removed.