Pile plate type roadbed
The drainage problem was solved by using three-dimensional drainage geotextile and permeable concrete layer in pile plate roadbeds, and emulsified asphalt was used for flexible connection at the expansion joint, which solved the problem of poor drainage effect and easy damage to steel casting rigid connection in the prior art. , improves the stability and service life of the roadbed and ensures traffic safety.
Patent Information
- Application Number
- CN202420289580.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-02-07
AI Technical Summary
The existing pile-slab roadbed has poor drainage effect in the lateral contact areas between the old road and the pile-slab roadbed, which affects the strength and stability of the roadbed. The rigid connection of steel cast high-strength concrete is easy to destroy the expansion joints, resulting in poor road conditions and traffic safety hazards.
The three-dimensional drainage geometries and permeable concrete layer are connected to ensure the accumulation of water flows out, and the flexible connection is used with emulsified asphalt at the expansion joints, replacing the traditional steel cast high-strength concrete rigid connection.
It improves the stability and service life of the roadbed, avoids the damage to the expansion joints by cast high-strength concrete from steel, and ensures traffic safety and stable traffic conditions.
Smart Images
Figure CN222205894U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of road construction, in particular to a pile-plate type roadbed. Background Art
[0002] In order to improve the service capacity of expressways, meet the growing traffic volume, and promote the improvement of Anhui Province's modern comprehensive transportation system, it is necessary to expand the four-lane road to eight-lane road. At present, highway construction resources are gradually reaching a bottleneck, the available land resources are becoming less and less, and the land occupation and soil excavation costs are increasing, and the land reclamation costs are increasing. This has led to the traditional roadbed structure layer with soil as the main body no longer meeting the requirements of economy. Therefore, a new construction technology-pile-slab roadbed came into being.
[0003] The existing pile-sheet roadbed usually has poor drainage effect at the lateral contact point between the old road and the pile-sheet roadbed, which affects the strength and stability of the roadbed and the service life of the road surface.
[0004] Existing pile-slab roadbeds usually use steel-cast high-strength concrete to pave temporary expansion joints to prevent the temporary expansion joints from being damaged due to long temporary traffic time, resulting in poor traffic conditions on the entire road and even traffic safety accidents. The rigid connection method of steel-cast high-strength concrete is also prone to damage to the expansion joints. Utility Model Content
[0005] Aiming at the deficiencies in the prior art, the utility model provides a pile-plate type roadbed.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] An old roadbed, wherein a first concrete cushion layer is laid on the top surface of the old roadbed, a pile-plate roadbed is arranged on one side of the old roadbed, and an expansion joint protection mechanism is arranged on the pile-plate roadbed;
[0008] The pile-slab roadbed comprises a No. 1 pipe pile group and a No. 2 pipe pile group fixedly connected to the ground, a prefabricated plate fixedly connected to the top surface of the No. 1 pipe pile group and the No. 2 pipe pile group, and a permanent steel bottom membrane is arranged on the bottom surface of the prefabricated plate;
[0009] A drainage mechanism includes a second concrete cushion layer fixedly connected to one side of an old road bed, an emulsified asphalt waterproof layer fixedly connected to the second concrete cushion layer, a permeable concrete layer fixedly connected to the emulsified asphalt waterproof layer, a top surface of the permeable concrete layer fixedly connected to a bottom surface of one end of a pile-plate roadbed close to the first concrete cushion layer through cast-in-place concrete, a three-dimensional drainage geonet fixedly connected to a side wall of the first concrete cushion layer close to the pile-plate roadbed, the three-dimensional drainage geonet and the cast-in-place concrete are fixedly connected by polyurethane sealant, and the bottom end of the three-dimensional drainage geonet is connected to the inside of the permeable concrete layer.
[0010] Preferably, the expansion joint protection mechanism comprises an expansion joint opened on the top surface of the prefabricated panel, emulsified asphalt is provided on the inner side wall of the expansion joint, and asphalt concrete is fixedly connected between the inner side walls of the expansion joint.
[0011] Preferably, the thickness of the second concrete cushion layer is 10 cm, and the top surface of the second concrete cushion layer is flush with the old roadbed on the side of the second concrete cushion layer.
[0012] Preferably, the permanent steel bottom membrane includes an embedded steel plate fixedly connected to the bottom surface of the precast panel by anchor bars, a steel plate bottom formwork is fixedly connected between the embedded steel plates on the bottom surfaces of adjacent precast panels, adjacent precast panels are fixedly connected by cast-in-place concrete, a U-shaped steel bar is fixedly connected to the top surface of the steel plate bottom formwork, and the U-shaped steel bar is fixedly connected to the precast panel by cast-in-place concrete.
[0013] Preferably, the surfaces of the embedded steel plate and the steel plate bottom mold are both provided with an anti-rust coating.
[0014] Preferably, temporary lifting holes are provided on the prefabricated panels and the embedded steel plates.
[0015] Compared with the prior art, the utility model has the following advantages:
[0016] The utility model is provided with a drainage mechanism, which is connected with the permeable concrete layer of the side wall of the roadbed of the old road through the three-dimensional drainage geonet, so that the accumulated water can flow out of the roadbed through the permeable concrete layer, thereby improving the stability and service life of the roadbed; at the same time, an expansion joint protection mechanism is provided, by arranging emulsified asphalt on the inner wall of the expansion joint, filling and rolling asphalt concrete after the emulsified asphalt is demulsified, and replacing the traditional rigid connection of high-strength concrete cast in steel with a flexible connection, so as to protect the expansion joint and further improve the stability and service life of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the main structure of a pile-sheet type roadbed proposed by the utility model;
[0018] Figure 2This is a schematic diagram of the top view structure of a pile-sheet type roadbed proposed by the utility model;
[0019] Figure 3 for Figure 1 A magnified image of point A;
[0020] Figure 4 for Figure 1 A magnified view of point B;
[0021] Figure 5 for Figure 2 Enlarged view of point C.
[0022] In the figure: 1 old roadbed, 2 first concrete cushion layer, 3 pile-slab roadbed, 4 No. 1 pipe pile group, 5 No. 2 pipe pile group, 6 precast slabs, 7 embedded steel plates, 8 steel plate bottom formwork, 9 second concrete cushion layer, 10 emulsified asphalt waterproof layer, 11 permeable concrete layer, 12 three-dimensional drainage geonet, 13 expansion joints, 14 polyurethane sealant. DETAILED DESCRIPTION
[0023] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0024] Reference Figure 1-Figure 5 A pile-sheet roadbed comprises an old roadbed 1, a first concrete cushion layer 2 is laid on the top surface of the old roadbed 1, a pile-sheet roadbed 3 is arranged on one side of the old roadbed 1, and an expansion joint protection mechanism is arranged on the pile-sheet roadbed 3;
[0025] The pile-slab roadbed 3 includes a No. 1 pipe pile group 4 and a No. 2 pipe pile group 5 fixedly connected to the ground, a precast plate 6 is fixedly connected to the top surface of the No. 1 pipe pile group 4 and the No. 2 pipe pile group 5, and a permanent steel bottom membrane is arranged on the bottom surface of the precast plate. The permanent steel bottom membrane includes an embedded steel plate 7 fixedly connected to the bottom surface of the precast plate 6 by anchor bars, and a steel plate bottom mold 8 is fixedly connected between the embedded steel plates 7 on the bottom surfaces of adjacent precast plates 6. Usually, quick-drying steel plate adhesive can be used for bonding connection, which can effectively prevent slurry seepage. At the same time, after the wet joint concrete is poured, the bottom mold does not need to be removed, and the adjacent precast plates 6 are fixedly connected by cast-in-place concrete. A U-shaped steel bar is fixedly connected to the top surface of the steel plate bottom mold 8, and the U-shaped steel bar is fixedly connected to the precast plate 6 by cast-in-place concrete. The surfaces of the embedded steel plate 7 and the steel plate bottom mold 8 are both provided with anti-rust coating The method of reserving a permanent steel bottom mold at the lower edge of the precast panel 6 is convenient and quick, improves the construction efficiency, and does not affect the structural integrity of the precast panel 6. Adjacent precast panels 6 are fixedly connected by cast-in-place concrete. Temporary lifting holes are provided on the precast panel 6 and the embedded steel plate 7 to facilitate lifting during construction. The concrete cushion layer and the cast-in-place concrete are both made of high-performance non-shrinkage concrete, that is, an expansion agent needs to be added to the high-performance non-shrinkage concrete. At present, the more suitable external expansion agent is MgO. The long-term delayed micro-expansion performance of MgO can effectively inhibit the temperature shrinkage and drying shrinkage of concrete, especially high-strength concrete. At the same time, organic synthetic fibers are added to the concrete, which can significantly improve the plastic cracking resistance and shrinkage resistance of the concrete.
[0026] The drainage mechanism includes a second concrete cushion layer 9 fixedly connected to one side of the old road bed 1, the thickness of the second concrete cushion layer 9 is 10 cm, and the top surface of the second concrete cushion layer 9 is flush with the old road bed 1 on the side of the second concrete cushion layer 9, an emulsified asphalt waterproof layer 10 is fixedly connected to the second concrete cushion layer 9, a permeable concrete layer 11 is fixedly connected to the emulsified asphalt waterproof layer 10, the top surface of the permeable concrete layer 11 is fixedly connected to the bottom surface of one end of the pile-plate roadbed 3 close to the first concrete cushion layer 2 through cast-in-place concrete, a three-dimensional drainage geonet 12 is fixedly connected to the side wall of the first concrete cushion layer 2 close to the pile-plate roadbed 3, the three-dimensional drainage geonet 12 and the cast-in-place concrete are fixedly connected by a polyurethane sealant 14, and the bottom end of the three-dimensional drainage geonet 12 is connected to the permeable concrete layer 11.
[0027] When encountering extreme weather such as heavy rain, there will usually be some water accumulation on the roadbed surface. The interaction between the accumulated water and the soil and stone will affect the strength and service life of the roadbed. By setting up a three-dimensional drainage geonet 12 and a permeable concrete layer 11, the accumulated water can flow out through the three-dimensional drainage geonet 12 and the permeable concrete layer 11 on the side wall of the old roadbed 1. At the same time, a polyurethane sealant 14 is arranged between the three-dimensional drainage geonet 12 and the cast-in-place concrete, and an emulsified asphalt waterproof layer 10 is arranged between the permeable concrete 1 and the second concrete cushion layer 9, so as to prevent the accumulated water from affecting the cast-in-place concrete and the second concrete cushion layer, thereby improving the stability and service life of the roadbed.
[0028] Reference Figure 1-Figure 5 The expansion joint protection mechanism includes an expansion joint 13 opened on the top surface of the prefabricated plate 6, emulsified asphalt is arranged on the inner wall of the expansion joint 13, and asphalt concrete is fixedly connected between the inner walls of the expansion joint 13.
[0029] During construction, a layer of emulsified asphalt is applied to the inner wall of the expansion joint 13, which is then sealed with a foam board. After the emulsified asphalt is demulsified, asphalt concrete is filled and rolled. A flexible connection replaces the traditional rigid connection of high-strength concrete cast in steel to protect the expansion joint 13, further improving the stability and service life of the roadbed.
[0030] The functional principle of the utility model can be explained through the following operation modes:
[0031] When encountering extreme weather such as heavy rain, there will usually be some water accumulation on the roadbed surface. The interaction between the accumulated water and the soil and stone will affect the strength and service life of the roadbed. By setting up a three-dimensional drainage geonet 12 and a permeable concrete layer 11, the accumulated water can flow out through the three-dimensional drainage geonet 12 and the permeable concrete layer 11 on the side wall of the old roadbed 1. At the same time, a polyurethane sealant 14 is arranged between the three-dimensional drainage geonet 12 and the cast-in-place concrete, and an emulsified asphalt waterproof layer 10 is arranged between the permeable concrete 1 and the second concrete cushion layer 9, so as to prevent the accumulated water from affecting the cast-in-place concrete and the second concrete cushion layer, thereby improving the stability and service life of the roadbed.
[0032] During construction, a layer of emulsified asphalt is applied to the inner wall of the expansion joint 13, which is then sealed with a foam board. After the emulsified asphalt is demulsified, asphalt concrete is filled and rolled. A flexible connection replaces the traditional rigid connection of high-strength concrete cast in steel to protect the expansion joint 13, further improving the stability and service life of the roadbed.
[0033] After the construction of the right panel of the pile-slab roadbed is completed, in order to ensure the temporary passage of the right 4 lanes, a layer of middle surface asphalt concrete needs to be laid on the panel. In order to prevent the temporary expansion joint from being damaged due to the long temporary traffic time, resulting in poor traffic conditions on the entire road and even traffic safety accidents. After discussion, the project department adopted the steel-casting high-strength concrete at the expansion joint, and the route was modified after the strength reached the design requirements. After one week of traffic, cracks, broken panels, potholes and other phenomena appeared at the expansion joint. After consulting and learning from many parties, the pile-slab roadbed technology application research team learned that the thickness of the pile-slab roadbed expansion joint was thin, and it was very easy to cause damage with rigid connections. Therefore, it was decided to use flexible connections instead of rigid connections, dredge and seal on site, break the damaged temporary expansion joints, clean them up, apply emulsified asphalt on the sides of the two bridge panels, and seal them with foam boards. After the emulsified asphalt is demulsified, fill and roll asphalt concrete. After all the construction is completed, traffic is opened, and there is no damage after 5 months of traffic.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A pile-sheet roadbed, characterized in that: include: An old road bed (1), wherein a first concrete cushion layer (2) is laid on the top surface of the old road bed (1), a pile-plate type roadbed (3) is arranged on one side of the old road bed (1), and an expansion joint protection mechanism is arranged on the pile-plate type roadbed (3); The pile-plate type roadbed (3) comprises a first pipe pile group (4) and a second pipe pile group (5) fixedly connected to the ground, a prefabricated plate (6) being fixedly connected to the top surface of the first pipe pile group (4) and the second pipe pile group (5), and a permanent steel bottom membrane being arranged on the bottom surface of the prefabricated plate; A drainage mechanism, the drainage mechanism comprising a second concrete cushion layer (9) fixedly connected to one side of an old roadbed (1), an emulsified asphalt waterproof layer (10) fixedly connected to the second concrete cushion layer (9), a permeable concrete layer (11) fixedly connected to the emulsified asphalt waterproof layer (10), the top surface of the permeable concrete layer (11) fixedly connected to the bottom surface of one end of a pile-plate roadbed (3) close to the first concrete cushion layer (2) through cast-in-place concrete, a three-dimensional drainage geonet (12) fixedly connected to the side wall of the first concrete cushion layer (2) close to the pile-plate roadbed (3), the three-dimensional drainage geonet (12) and the cast-in-place concrete fixedly connected by a polyurethane sealant (14), and the bottom end of the three-dimensional drainage geonet (12) is connected to the inside of the permeable concrete layer (11).
2. A pile-sheet roadbed according to claim 1, characterized in that: in: The expansion joint protection mechanism comprises an expansion joint (13) opened on the top surface of the prefabricated plate (6), emulsified asphalt is arranged on the inner side wall of the expansion joint (13), and asphalt concrete is fixedly connected between the inner side walls of the expansion joint (13).
3. A pile-sheet roadbed according to claim 1, characterized in that: in: The thickness of the second concrete cushion layer (9) is 10 cm, and the top surface of the second concrete cushion layer (9) is flush with the old roadbed (1) on the side of the second concrete cushion layer (9).
4. A pile-sheet roadbed according to claim 2, characterized in that: in: The permanent steel bottom membrane comprises an embedded steel plate (7) fixedly connected to the bottom surface of the precast panel (6) by anchor bars, a steel plate bottom formwork (8) is fixedly connected between the embedded steel plates (7) on the bottom surfaces of adjacent precast panels (6), adjacent precast panels (6) are fixedly connected by cast-in-place concrete, a U-shaped steel bar is fixedly connected to the top surface of the steel plate bottom formwork (8), and the U-shaped steel bar is fixedly connected to the precast panel (6) by cast-in-place concrete.
5. A pile-sheet roadbed according to claim 4, characterized in that: in: The surfaces of the embedded steel plate (7) and the steel plate bottom mold (8) are both provided with an anti-rust coating.
6. The pile-sheet roadbed according to claim 1, characterized in that: in: Temporary lifting holes are provided on the prefabricated plate (6) and the embedded steel plate (7).