Bridge end transition slab device for preventing collapse

Abstract

The utility model discloses a bridge end transition slab device for preventing collapse. The bridge end transition slab device comprises a soil filling layer; the geogrid net is arranged in the soil filling layer, and the top surface of the geogrid net is flush with the top surface of the soil filling layer; the lean concrete layer is arranged on the soil filling layer; the lower buffer layer is arranged on the lean concrete, the abutment cap and the sleeper beam layer and is formed by grouting polyurea grouting liquid; the butt strap body is arranged on the upper surface of the lower buffer layer; and the upper buffer layer is solidified on the top surface of the butt strap body and is formed by grouting polyurea grouting liquid. Polyurea grouting liquid is added to the upper layer and the lower layer of the butt strap body to form the upper buffer layer and the lower buffer layer, vibration generated when a vehicle passes through is relieved through the elastic effect of the polyurea grouting liquid, and the possibility of cracks is reduced; the concrete is protected by utilizing the waterproof and damp-proof characteristics of the polyurea grouting liquid, so that the butt strap is prevented from being corroded and the strength is prevented from being reduced, and steel bars are protected; the polyurea grouting liquid has high strength and binding power, the structure is reinforced, the overall stability and bearing capacity are improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of bridge technology, and in particular to a bridge approach slab device for preventing collapse. Background Technology

[0002] A bridge approach slab is a concrete or reinforced concrete structure with one end resting on the abutment or cantilever beam end and the other end partially resting on the subgrade or base layer of the approach road. It rests between the abutment or cantilever beam end and the backfill, and can rotate as the backfill settles. This provides cushioning for vehicles, preventing unevenness and discomfort even when the backfill settles. The approach slab is placed where the bridge connects to the road, typically supported at the front by an abutment cap and at the rear by a sleeper beam, ensuring a smoother connection between the approach slab and the road.

[0003] At present, the following problems exist in the practical application of bridge approach slabs: (1) Approach slabs can prevent the phenomenon of "bridge approach slab jumping" to a certain extent, but if the foundation of the approach slab is not stable or the construction quality is poor, it may cause the approach slab to sink, thereby affecting driving comfort and safety; (2) Due to repeated loads or temperature changes, cracks may appear on the surface of the approach slab, or the concrete of the approach slab may be exposed to the environment for a long time, which may cause carbonization and reduce strength, or the approach slab may crack and cause steel corrosion, affecting the durability of the structure, thus making it difficult to alleviate the problem of "bridge approach slab jumping". Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a bridge approach slab device for preventing collapse.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A bridge abutment slab device for preventing collapse includes:

[0007] Backfill layer;

[0008] Geogrid mesh is installed in the fill layer, and its top surface is flush with the top surface of the fill layer;

[0009] A lean concrete layer is placed on top of the fill layer;

[0010] The lower buffer layer, which is disposed on top of the lean concrete layer, is formed by grouting with polyurea grout;

[0011] The slab body is disposed on top of the lower buffer layer;

[0012] The upper buffer layer, which is fixed to the top surface of the slab body, is formed by grouting with polyurea grout.

[0013] Preferably, the thickness of the lower buffer layer is 3-5 cm.

[0014] Preferably, the thickness of the upper buffer layer is 3-5 cm.

[0015] Preferably, the thickness of the lean concrete layer is 13-16 cm.

[0016] Preferably, the geogrid extends from the foundation to the top surface of the fill layer, and is arranged in a three-dimensional grid pattern with a horizontal spacing of 40-60cm, a longitudinal spacing of 40-60cm, and a vertical spacing of 15-25cm.

[0017] Preferably, the width and length of the lower buffer layer and / or the upper buffer layer are the same as the width and length of the platform body.

[0018] Preferably, the lower buffer layer is formed by pouring polyurea grout onto the lean concrete layer, the cap, and the sleeper beam.

[0019] Preferably, the upper buffer layer is formed by pouring polyurea grout onto the slab body.

[0020] Preferably, a sand cushion layer or gravel cushion layer with a thickness of 10-15cm is also provided below the fill layer.

[0021] Preferably, the geogrid is a steel-plastic geogrid.

[0022] The above-described bridge approach slab device for preventing collapse provides a preferred construction method: First, a geogrid mesh layer is tied layer by layer on the foundation, and backfill material is laid layer by layer in the geogrid mesh layer. The backfill is filled, compacted and leveled. This process is repeated until the design elevation is reached, completing the construction of the backfill layer and geogrid mesh. Then, a lean concrete layer is poured in place. A lower buffer layer is poured on the lean concrete layer, the abutment cap and the sleeper beam. After the lower buffer layer solidifies, the prefabricated approach slab body is placed on top, and an upper buffer layer is poured on top of the approach slab body. After the upper buffer layer is completely solidified, the bridge deck paving construction is carried out.

[0023] This utility model has the following advantages:

[0024] (1) In this utility model, polyurea grout is added to the upper and lower layers of the slab body to form an upper buffer layer and a lower buffer layer. The elasticity of polyurea grout is used to reduce the vibration when vehicles pass by, and reduce the possibility of cracks in the slab caused by repeated loads. The waterproof and moisture-proof properties of polyurea grout protect the concrete of the slab, prevent corrosion and strength reduction, and better protect the reinforcing steel. The high strength and high adhesion of polyurea grout can strengthen the structure, improve the overall stability and load-bearing capacity, and extend the service life of the slab.

[0025] (2) The backfill under the slab body is separated by geogrid mesh, which can fix the soil and distribute the load, enhance the overall strength and stability of the soil, thereby improving the foundation stability of the slab and better avoiding the settlement problem of the slab.

[0026] (3) The present invention further lays a sand cushion layer or a crushed stone cushion layer on the foundation, which can better improve the bearing capacity and drainage performance of the foundation. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0028] Figure 2 yes Figure 1 A top view of a portion of the geogrid structure.

[0029] Figure 3 This is a schematic diagram of a partial three-dimensional structure of a geogrid.

[0030] In the diagram, 1 is the fill layer, 2 is the geogrid, 3 is the lean concrete layer, 4 is the sleeper beam, 5 is the pavement structure layer, 6 is the lower buffer layer, 7 is the approach slab body, 8 is the upper buffer layer, 9 is the bridge deck pavement, 10 is the expansion joint, 11 is the abutment cap, and 12 is the crushed stone cushion layer. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] A bridge abutment slab device for preventing collapse includes a soil fill layer 1, a geogrid 2, a lean concrete layer 3, a lower buffer layer 6, an abutment slab body 7, and an upper buffer layer 8. The soil fill layer 1 uses conventional fill materials such as sand and gravel. The geogrid 2 is placed within the soil fill layer 1; its placement serves to fix the soil and distribute the load, and its top surface is flush with the top surface of the soil fill layer 1, ensuring better support for the structure above and improving foundation stability. The lean concrete layer 3 is placed on top of the soil fill layer 1 and is also supported by the geogrid 2. The lean concrete layer 3 provides a smooth surface and can be cast using C15 concrete. The lower buffer layer 6 is placed on top of the lean concrete layer 3 and is formed by grouting with polyurea grout. The abutment slab body 7 is placed on top of the lower buffer layer 6. The upper buffer layer 8 is fixed to the top surface of the abutment slab body 7 and is formed by grouting with polyurea grout. A lower buffer layer 6 is installed under the slab body 7. The elasticity of the polyurea grout reduces vibrations when vehicles pass by, and also reduces the impact between the slab body 7 and the lean concrete layer 3, better distributing the load downwards and reducing the possibility of cracks appearing in the slab body 7. The lower buffer layer 6 is installed on top of the slab body 7 to reduce the impact of vehicles on the slab body 7, reduce cracks caused by repeated loads, and utilize the waterproof and moisture-proof properties of the polyurea grout to protect the concrete of the slab body 7. If steel reinforcement is used in the slab body 7, it can also better protect the steel reinforcement, reduce the possibility of water seeping into the slab body 7 and corroding the steel reinforcement, thereby extending the service life of the slab body 7.

[0035] Preferably, depending on the actual situation, the thickness of the lower buffer layer 6 is designed to be 3-5cm, which can provide a good buffering effect. Similarly, the thickness of the upper buffer layer 8 is 3-5cm, which can provide a good buffering effect.

[0036] Preferably, the thickness of the lean concrete layer 3 is 13-16 cm, and more preferably 15 cm.

[0037] Preferably, combined with Figure 3 As shown, geogrid 2 extends from the foundation to the top surface of fill layer 1. The foundation stably supports geogrid 2, thus ensuring that geogrid 2 more stably supports the structure above it. Geogrid 2 is arranged in a three-dimensional mesh pattern, with a horizontal spacing x of 40-60cm, a longitudinal spacing y of 40-60cm, and a vertical spacing d of 15-25cm. Generally, the horizontal geogrid mesh layer is planar. Therefore, multiple connecting rods or binding straps can be set between adjacent planar geogrid mesh layers to achieve connection between them. Each mesh connection node in the planar geogrid mesh layer is correspondingly equipped with a connecting rod or binding strap to ensure the support effect.

[0038] Preferably, the width and length of the lower buffer layer 6 and the upper buffer layer 8 are the same as the width and length of the slab body 7, which can better protect the upper and lower surfaces of the slab body 7. More preferably, based on the design of the width and length of the lower buffer layer 6, and with the front end of the slab body 7 supported by the cap 11 and the rear end supported by the bolster beam 4, the lower buffer layer 6 is formed by pouring polyurea grout onto the lean concrete layer 3 and the corresponding parts of the cap 11 and the bolster beam 4. This allows the lower buffer layer 6 to support the entire slab body 7, maintain the flatness of the lean concrete layer 3 for a longer period of time, and enhance the integrity of the cap 11 and the bolster beam 4.

[0039] Preferably, the upper buffer layer 8 is formed by pouring polyurea grout onto the slab body 7, and the two are bonded together, which can better protect the upper surface of the slab body 7 and reduce the probability of cracking.

[0040] Preferably, the geogrid 2 is a steel-plastic geogrid, which is made of high-density polyethylene wrapped into high-strength strips, resulting in high strength and low creep, which can better ensure the stability of the foundation.

[0041] This embodiment provides a preferred construction method for the above-mentioned bridge approach slab device: First, a layer of geogrid mesh is tied on the foundation. The geogrid mesh is fixed to the foundation using U-shaped nails or anchor rods. Backfill material is laid in the geogrid mesh 2, filled, compacted, and leveled. Then, a second layer of geogrid mesh is laid on top of the first layer of geogrid mesh, backfill material is laid, filled, compacted, and leveled, and so on until the design elevation is reached, completing the construction of the backfill layer 1 and geogrid mesh 2. Then, a layer of lean concrete 3 is poured in place. A lower buffer layer 6 is poured on the lean concrete layer 3, the abutment cap, and the 11 sleeper beam 4. After the lower buffer layer 6 solidifies, the prefabricated approach slab body 7 is placed on top, and an upper buffer layer 8 is poured on top of the approach slab body 7. After the upper buffer layer 8 is completely solidified, the bridge deck paving 9 is constructed. The approach slab 7 can be prefabricated, and an expansion joint 10 is left between the bridge deck paving 9 at the abutment cap 11. Of course, before the bridge approach slab device is constructed, other supporting devices, such as the abutment cap 11 and the sleeper beam 4, have been constructed according to the existing technology. The front end of the approach slab body 7 is supported by the abutment cap 11 and the rear end is supported by the sleeper beam 4. In order to reduce vibration, improve waterproof and moisture-proof effect, enhance adhesion, and strengthen the structure, improve overall stability and load-bearing capacity, the original tar paper pad layer under the part of the approach slab body 7 that is supported by the abutment cap 11 and the sleeper beam 4 in the existing technology is replaced with a lower buffer layer 10. This can also better enhance the integrity of the abutment cap 11 and the sleeper beam 4.

[0042] Preferably, a sand cushion layer or gravel cushion layer 12 with a thickness of 10-15cm is also provided below the fill layer 1. The sand cushion layer or gravel cushion layer 12 can better improve the bearing capacity and drainage performance of the foundation. If the sand cushion layer or gravel cushion layer 12 is provided, the geogrid 2 also passes through the sand cushion layer or gravel cushion layer 12 and is supported by the foundation.

[0043] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A bridge approach slab device for preventing collapse, characterized in that... include: Backfill layer; Geogrid mesh is installed in the fill layer, and its top surface is flush with the top surface of the fill layer; A lean concrete layer is placed on top of the fill layer; The lower buffer layer, which is disposed on the lean concrete layer, is formed by grouting with polyurea grout; The slab body is disposed on top of the lower buffer layer; The upper buffer layer, which is fixed to the top surface of the slab body, is formed by grouting with polyurea grout.

2. The bridge approach slab device for preventing collapse according to claim 1, characterized in that: The thickness of the lower buffer layer is 3-5 cm.

3. The bridge approach slab device for preventing collapse according to claim 1, characterized in that: The thickness of the upper buffer layer is 3-5cm.

4. The bridge approach slab device for preventing collapse according to claim 1, characterized in that: The thickness of the lean concrete layer is 13-16 cm.

5. The bridge approach slab device for preventing collapse according to claim 1, characterized in that: The geogrid extends from the foundation to the top surface of the fill layer, arranged in a three-dimensional grid pattern, with a horizontal spacing of 40-60cm, a longitudinal spacing of 40-60cm, and a vertical spacing of 15-25cm.

6. The bridge approach slab device for preventing collapse according to claim 1, characterized in that: The width and length of the lower buffer layer and / or the upper buffer layer are the same as the width and length of the platform body.

7. The bridge approach slab device for preventing collapse according to claim 6, characterized in that: The lower buffer layer is formed by pouring polyurea grout onto the lean concrete layer, the cap, and the sleeper beam.

8. The bridge approach slab device for preventing collapse according to claim 1 or 3, characterized in that: The upper buffer layer is formed by pouring polyurea grout onto the slab body.

9. The bridge approach slab device for preventing collapse according to any one of claims 1-6, characterized in that: Below the fill layer, there is also a sand cushion layer or gravel cushion layer with a thickness of 10-15cm.

10. The bridge approach slab device for preventing collapse according to any one of claims 1-6, characterized in that: The geogrid used is a steel-plastic geogrid.

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