Expansion eliminating structure for preventing arch expansion of highway pavement in saline soil area

Abstract

The utility model discloses an expansion eliminating structure for preventing arching expansion of an expressway pavement in a salinized soil area, and relates to the technical field of expressway repair, the expansion eliminating structure comprises a roadbed, the top surface of the roadbed is provided with an expansion eliminating piece, the expansion eliminating piece comprises a cement stabilized macadam base layer I, the cement stabilized macadam base layer I is arranged on the top surface of the roadbed, and the cement stabilized macadam base layer II is arranged on the top surface of the roadbed; according to the utility model, the construction process is simple, people are sparsely populated in desert and gobi areas, the number of structures is small, lines mostly pass through in a roadbed form and possibly pass through unmanned areas and natural reserve areas, the continuous length of the base layers is large, the construction period is short, the construction period is short, and the construction cost is low. The cement stabilized macadam base layer belongs to a semi-rigid base layer and is high in heat absorption capacity, stress caused by temperature and salinized soil cannot be effectively released, the ATB-25 asphalt macadam mixture is a flexible material, and the continuous length of the cement stabilized macadam base layer can be shortened, stress can be released, and arch expansion can be eliminated by arranging the expansion eliminating grooves.

Description

TECHNICAL FIELD

[0001] The utility model relates to expressway repair technical field, concretely is a kind of prevent salted soil area expressway pavement arch inflation's deflation structure. BACKGROUND

[0002] In recent years, the mileage of expressway built in China is increasing, and the related technology and structure are also becoming mature and stable. The form of expressway pavement structure layer has basically formed, that is, asphalt surface layer + cement stabilized macadam base + cement stabilized macadam bottom base. Currently, this structure form is widely used in the design of expressway pavement in China. In general, in the areas with pleasant climate, humidity and small temperature difference, the pavement base is relatively stable and has less disease. However, in the northwest region, due to dry climate, large diurnal temperature difference and drought, the environment cannot adjust the temperature stress caused by it, so the base layer will appear arch inflation phenomenon, which further causes pavement cracking. In addition, in the gobi desert area, the salted soil phenomenon is serious, which is easy to produce salt expansion disease and damage the pavement structure

[0003] The traditional prevention measures for salted soil disease mainly include setting a separation layer. When the thickness of salted soil is less than 0.3 m, the salted soil can be completely removed by cleaning the surface, and no separate treatment is needed. When the thickness of salted soil is greater than 0.3 m, the surface is cleaned first, and then the roadbed is filled. A layer of composite geomembrane is laid at a height of 30 cm above the original ground, and two geotextiles and one membrane are used. For low filling and shallow excavation sections, a layer of composite geomembrane is laid at the bottom of the roadbed. In the desert gobi area, salt expansion and arch inflation caused by temperature stress often coexist. In the construction process, there may be problems such as poor construction quality, insufficient cleaning thickness, and roadbed filling material not meeting the requirements. In this environment, higher requirements are put forward for the prevention and treatment of pavement arch inflation disease.

[0004] Therefore, based on the above search and combined with the prior art, a deflation structure for preventing expressway pavement arch inflation in salted soil area is proposed to solve the above problems. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a deflation structure for preventing expressway pavement arch inflation in salted soil area to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of preventing salted soil area highway pavement arching and expanding of deflation structure, including: roadbed, the top surface of roadbed is provided with deflation piece, deflation piece includes: cement stabilized macadam base one, the top surface of roadbed is provided with cement stabilized macadam base one, the top surface of cement stabilized macadam base one is provided with cement stabilized macadam base two, the top surface of cement stabilized macadam base two is opened with deflation groove, the bottom surface of deflation groove is opened with multiple round grooves one, the bottom surface of multiple round grooves one is opened with round groove two, and asphalt mixture is arranged in the deflation groove;Pressing piece, pressing piece is arranged on cement stabilized macadam base two, and it is used to press the top surface of asphalt mixture, to avoid deformation.

[0008] Preferably, the pressing piece includes: a bracket fixedly installed on the top surface of the cement stabilized macadam base two, gravity blocks fixedly installed on both sides of the interior of the bracket, an installation groove opened on the bottom surface of the bracket, an electric push rod fixedly installed in the interior of the installation groove, and a pressing plate slidably connected to the interior of the installation groove.

[0009] Preferably, the side wall of the cement stabilized macadam base two is provided with a fine-grained asphalt repair layer, a medium-grained asphalt repair layer and a coarse-grained asphalt repair layer from bottom to top.

[0010] Preferably, the cement stabilized macadam base two is in communication with the round groove one, and the round groove one is in communication with the round groove two.

[0011] Preferably, the output shaft of the electric push rod is connected to the top surface of the pressing plate.

[0012] Preferably, a warning sign is fixedly installed on the top surface of the bracket, and the outer surface of the warning sign is provided with a reflective coating.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1、The utility model has simple construction technology, sparse population in desert and gobi area, less structures, and the line is mostly in the form of roadbed, which may pass through uninhabited areas and nature reserves. The base layer has a large continuous length, the cement stabilized macadam base is a semi-rigid base layer with strong heat absorption capacity, and the stress caused by temperature and saline soil cannot be effectively released. The ATB-25 asphalt macadam mixture is a flexible material, the deflation groove can shorten the continuous length of the cement stabilized macadam base, release stress and eliminate arching and expanding. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Fig. 2 It is a schematic diagram of the connection structure of the two groups of deflation pieces of the utility model;

[0017] Fig. 3This is a schematic diagram of the pressing component structure of this utility model.

[0018] In the diagram: 1. Roadbed; 2. Cement-stabilized crushed stone base course 1; 3. Cement-stabilized crushed stone base course 2; 4. Expansion relief trench; 5. Circular trench 1; 6. Circular trench 2; 7. Fine-grained asphalt repair layer; 8. Medium-grained asphalt repair layer; 9. Coarse-grained asphalt repair layer; 10. Asphalt mixture; 11. Support; 12. Gravity block; 13. Installation groove; 14. Electric actuator; 15. Pressure plate; 16. Warning sign. Detailed Implementation

[0019] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In one typical implementation of this application, please refer to Figs. 1-3 As shown, a swelling-reducing structure for preventing highway pavement bulging in saline soil areas includes: a roadbed 1, wherein a swelling-reducing component is provided on the top surface of the roadbed 1, the swelling-reducing component comprising:

[0021] Cement-stabilized crushed stone base course 1 2 is 20cm thick and is set on the top surface of roadbed 1. Cement-stabilized crushed stone base course 2 3 is set on the top surface of cement-stabilized crushed stone base course 1 3 is 36cm thick. Expansion relief groove 4 is opened on the top surface of cement-stabilized crushed stone base course 2 3. Expansion relief groove 4 is 2m wide and 0.18m deep. Generally, expansion relief groove 4 is set 100m away from the bridgehead. For open culverts without approach slabs, expansion relief groove 4 is set behind the culvert. The other spacing should not be greater than 300m, and it should be set at the slope change points of concave and convex curves as much as possible. Multiple circular grooves 1 5 are opened on the bottom surface of expansion relief groove 4. Circular grooves 2 6 are opened on the bottom surface of multiple circular grooves 1 5. Asphalt mixture 10 is set in expansion relief groove 4. The asphalt mixture 10 is of type ATB-25. Cement-stabilized crushed stone base course 2 3 is connected to circular groove 1 5, and circular groove 1 5 is connected to circular groove 2 6.

[0022] The pressing component is set on the cement-stabilized crushed stone base layer 2 3 and is used to press the top surface of the asphalt mixture 10 to prevent deformation.

[0023] The sidewall of cement-stabilized crushed stone base course 2 3 is provided with a fine-grained asphalt repair layer 7, a medium-grained asphalt repair layer 8, and a coarse-grained asphalt repair layer 9 from bottom to top.

[0024] It is worth mentioning that if the cement-stabilized crushed stone base course 23 has been completed, the lower layer should be cut first according to the width of 2.4m, and then the base course should be cut. First, use a machine to cut from the top surface of the cement-stabilized crushed stone base course 23 downwards, remove the water-stabilized crushed stone of the base course, and apply fine-grained asphalt repair layer 7, medium-grained asphalt repair layer 8, and coarse-grained asphalt repair layer 9 to the sides of the expansion trench 4 in sequence. Then, lay ATB-25 asphalt mixture 10 in the expansion trench 4. The filling asphalt mixture 10 should be laid in three layers of 6cm + 6cm + 6cm to ensure that its compaction degree is not less than 97%. After the asphalt mixture 10 is completed, the lower layer should be re-laid.

[0025] In addition, before construction, the layout should be carried out to accurately locate the position where the expansion relief groove 4 needs to be set. The water-stabilized crushed stone should be cut and removed from the top surface of the base layer according to the above dimensions. Then, fine-grained asphalt repair layer 7, medium-grained asphalt repair layer 8, and coarse-grained asphalt repair layer 9 should be applied to the side wall of the expansion relief groove 4 in sequence. Then, asphalt mixture 10 should be injected. Before paving the mixture, the lower layer must be inspected, especially the pollution status of the lower layer. If it does not meet the requirements, it must be treated. Otherwise, paving is not allowed. The ATB-25 asphalt mixture 10 from the factory must meet the specifications. If overheating material, white material or unqualified material is found, it should not be paved. The paver should be used to pave and level the mixture in layers. During the paving process, attention should be paid to the continuity. The roller should be used to compact the mixture in layers according to the "initial compaction, intermediate compaction and final compaction" process. Cracking and displacement should not occur. Finally, the flatness and 97% compaction degree should be guaranteed.

[0026] The pressing component includes: a bracket 11, which is fixedly installed on the top surface of the cement-stabilized crushed stone base layer 2 3. Gravity blocks 12 are fixedly installed on both sides inside the bracket 11. An installation groove 13 is opened on the bottom surface of the bracket 11. An electric push rod 14 is fixedly installed inside the installation groove 13. A pressure plate 15 is slidably connected inside the installation groove 13. The output shaft of the electric push rod 14 is connected to the top surface of the pressure plate 15.

[0027] Based on the above features, the top surface of the asphalt mixture 10 can be pressed to prevent deformation of the asphalt mixture 10. Specifically, when in use, the support 11 is placed on the top surface of the cement-stabilized crushed stone base layer 2 3, and then the electric actuator 14 is activated so that the pressure plate 15 connected to the output shaft of the electric actuator 14 presses the top surface of the asphalt mixture 10.

[0028] A warning sign 16 is fixedly installed on the top surface of the bracket 11. The outer surface of the warning sign 16 is coated with reflective paint. By installing the warning sign 16, passing vehicles and pedestrians can be warned to avoid stepping on the paved asphalt mixture 10.

[0029] Working principle:

[0030] In use, first lay out the lines to accurately locate the position where the expansion relief groove 4 needs to be set. Use a cutting machine to cut and remove the water-stabilized crushed stone from the top surface of the base layer according to the above dimensions. Then, apply the fine-grained asphalt repair layer 7, medium-grained asphalt repair layer 8, and coarse-grained asphalt repair layer 9 to the side wall of the expansion relief groove 4 in sequence. Then, inject the asphalt mixture 10 and compact it in layers according to the "initial compaction, intermediate compaction, and final compaction" process with a road roller. Then, place the support 11 on the top surface of the cement-stabilized crushed stone base layer 2 3. Then, start the electric actuator 14 so that the pressure plate 15 connected to the output shaft of the electric actuator 14 presses the top surface of the asphalt mixture 10. The warning sign 16 can warn passing vehicles and pedestrians to avoid them stepping on the laid asphalt mixture 10.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A swelling-reducing structure for preventing arching of highway pavements in saline soil areas, characterized in that: Comprising: a roadbed (1), the top surface of the roadbed (1) is provided with a swelling relieving piece, the swelling relieving piece comprising: a cement stabilized macadam base one (2), the cement stabilized macadam base one (2) is arranged on the top surface of the roadbed (1), the top surface of the cement stabilized macadam base one (2) is provided with a cement stabilized macadam base two (3), the top surface of the cement stabilized macadam base two (3) is provided with a swelling relieving groove (4), the bottom surface of the swelling relieving groove (4) is provided with a plurality of round grooves one (5), the bottom surface of each of the plurality of round grooves one (5) is provided with a round groove two (6), and the swelling relieving groove (4) is provided with an asphalt mixture (10); a pressing piece, the pressing piece is arranged on the cement stabilized macadam base two (3) and is used for pressing the top surface of the asphalt mixture (10) to avoid deformation.

2. The anti-swelling structure for preventing the arching swelling of the expressway pavement in the saline soil area according to claim 1, characterized in that: The pressing piece comprises: a support (11), the support (11) is fixedly installed on the top surface of the cement stabilized macadam base two (3), both sides of the inside of the support (11) are fixedly installed with a gravity block (12), the bottom surface of the support (11) is provided with a mounting groove (13), the inside of the mounting groove (13) is fixedly installed with an electric push rod (14), and the inside of the mounting groove (13) is slidably connected with a pressing plate (15).

3. The anti-swelling structure for preventing the arching swelling of the expressway pavement in the saline soil area according to claim 1, characterized in that: The side wall of the cement stabilized macadam base two (3) is provided from bottom to top with a fine-grained asphalt repair layer (7), a medium-grained asphalt repair layer (8), and a coarse-grained asphalt repair layer (9).

4. The anti-swelling structure for preventing the arching swelling of the expressway pavement in the saline soil area according to claim 1, characterized in that: The cement stabilized macadam base two (3) is in communication with the round groove one (5), and the round groove one (5) is in communication with the round groove two (6).

5. The anti-swelling structure for preventing the arching swelling of the expressway pavement in the saline soil area according to claim 2, characterized in that: The output shaft of the electric push rod (14) is connected with the top surface of the pressing plate (15).

6. The anti-swelling structure for preventing the arching swelling of the expressway pavement in the saline soil area according to claim 2, characterized in that: The top surface of the support (11) is fixedly installed with a warning sign (16), and the outer surface of the warning sign (16) is provided with a reflective paint.

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