CN111395213A - Construction method of energy-consuming and shock-absorbing combined shed tunnel structure resisting landslide collapse body impact - Google Patents
Construction method of energy-consuming and shock-absorbing combined shed tunnel structure resisting landslide collapse body impact Download PDFInfo
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- CN111395213A CN111395213A CN202010160283.1A CN202010160283A CN111395213A CN 111395213 A CN111395213 A CN 111395213A CN 202010160283 A CN202010160283 A CN 202010160283A CN 111395213 A CN111395213 A CN 111395213A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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- E01F7/00—Devices affording protection against snow, sand drifts, side-wind effects, snowslides, avalanches or falling rocks; Anti-dazzle arrangements ; Sight-screens for roads, e.g. to mask accident site
- E01F7/04—Devices affording protection against snowslides, avalanches or falling rocks, e.g. avalanche preventing structures, galleries
- E01F7/045—Devices specially adapted for protecting against falling rocks, e.g. galleries, nets, rock traps
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Abstract
The invention discloses a construction method of an energy-consuming and shock-absorbing combined shed tunnel structure for resisting landslide collapse body impact, wherein the energy-consuming and shock-absorbing combined shed tunnel structure comprises top beams, shed tunnel plates, composite buffer cushion layers and energy-consuming shock absorbers, the top beams are arranged on two sides of the ground of a region to be protected, the shed tunnel plates are supported on the tops of the top beams through the energy-consuming shock absorbers, a waterproof layer is constructed on the top surfaces of the shed tunnel plates, then a foam cushion layer, a steel plate layer and a geocell reinforced soil layer are constructed in sequence, geocells are fully stretched, tiled and unfolded on the steel plate layer in the construction process, each geocell at the end part is fixed by pins, soil is fully filled in a cell space, and then soil is gradually filled to a corresponding design elevation to form the composite buffer. The invention has simple construction and long service life, reduces the dead weight of the shed tunnel structure, improves the landslide collapse resistance and the energy absorption and shock absorption performance of the shed tunnel structure, and improves the safety and the stability of the shed tunnel structure. The method is particularly suitable for shed tunnel structure construction of a section where landslide disasters frequently occur.
Description
Technical Field
The invention relates to the technical field of slope protection and disaster management, in particular to a construction method of an energy-dissipation and shock-absorption combined shed tunnel structure resisting landslide collapse body impact.
Background
In the southwest of China, due to the strong rising of the Tibet plateau and the rapid deep cutting of rivers, slopes are high and steep, unloading is strong, and rock mass structures are complex. Under the combined action of natural factors such as rainfall seepage, earthquake disturbance and the like and human factors such as digging a mountain and digging a wall and gargling and excessive cutting, slope instability, rockfall and debris flow disasters are easily caused. Landslide collapse bodies such as rockfall, debris flow and the like pose serious threats to traffic construction and transportation safety in southwest of China. The reinforced concrete shed tunnel is a commonly used protective structure in road traffic engineering, and the shed tunnel utilizes a buffer layer at the top to absorb energy so as to protect the safety of the shed tunnel structure. The traditional shed tunnel buffer cushion layer is a soil layer, and the soil layer can effectively absorb energy and reduce impact force acting on the shed tunnel structure. The increase of the thickness of the soil layer can effectively improve the energy dissipation and shock absorption capacity of the shed tunnel, but simultaneously increases the self weight of the structure, improves the structural design requirement of the shed tunnel, and increases the construction cost. The thinner cushion layer thickness can not effectively absorb impact energy, and is not beneficial to protecting the shed tunnel structure. This conflict limits the use of soil layers as cushioning layers in the field of shed tunnel structure protection. To reduce the dead weight of the shed tunnel, more and more lightweight cushioning materials are used in the design of the cushioning layer. For example, the shed tunnel top structure and the construction method thereof disclosed in the Chinese invention patent (publication No. CN106194212A) are used for resisting the impact of debris flow and falling rocks, and the falling rocks are intercepted by a steel wire grating, and the energy is absorbed by using clay and polystyrene foam (EPS) as buffer layers. However, once the falling energy is large, the steel wire grating and the polystyrene foam (EPS) are easy to generate plastic damage, and the later maintenance cost is high. Therefore, the development of the energy-consuming and shock-absorbing combined shed tunnel structure which has the advantages of strong energy-absorbing and shock-absorbing performance, small structural dead weight, good durability and economic construction has important engineering significance for protecting the road traffic safety in the area with frequent landslide disasters.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a construction method of an energy-consuming and shock-absorbing combined shed tunnel structure with landslide collapse body impact resistance, so as to reduce the dead weight of the shed tunnel and improve the landslide collapse body impact resistance, energy absorption and shock absorption performance of the shed tunnel.
The purpose of the invention is realized by the following technical scheme:
the utility model provides an energy consumption shock attenuation combination shed hole structure construction method that anti landslide body that collapses assaults, energy consumption shock attenuation combination shed hole structure include back timber, shed hole board, compound cushion layer and energy consumption bumper shock absorber, the back timber is located and is treated the ground both sides of protective area, the shed hole board supports the shed hole structure that anti landslide body that collapses assaults at the top of back timber through the energy consumption bumper shock absorber, compound cushion layer includes by foam cushion layer, steel sheet layer and the geocell that down laid in proper order in shed hole board top surface and adds the muscle soil layer, its characterized in that includes following step:
step 1: constructing a shed tunnel, namely constructing a top beam and a shed tunnel plate in an area to be constructed, and arranging an energy dissipation shock absorber between the shed tunnel plate and the top beam;
step 2: after the construction of the shed tunnel plate is finished, cleaning the top surface of the shed tunnel plate and making a waterproof layer;
and step 3: laying a foam cushion layer on the waterproof layer on the top surface of the shed tunnel;
and 4, step 4: paving a steel plate layer subjected to rust prevention treatment on the surface of the paved foam cushion layer;
and 5: and paving a geocell reinforced soil layer on the steel plate layer, fully stretching, flatly paving and unfolding the geocell on the steel plate layer, fixing each geocell at the end part by using a pin, fully filling the space of the geocell with soil, and gradually filling the soil to a corresponding design elevation to complete the construction of the energy-dissipation and shock-absorption combined shed and tunnel structure.
Further, in the step 1, the energy dissipation damper comprises an inner steel pipe and an outer steel pipe which are nested, and steel base plates are welded at the top and the bottom of the inner steel pipe and the bottom of the outer steel pipe to form a double-layer metal cylindrical structure.
Further, be equipped with respectively between steel backing plate about the energy dissipation bumper shock absorber and shed hole board and the back timber and be used for the second grade absorbing rubber packing ring, the rubber packing ring can not only play the second grade cushioning effect, can also increase the static friction between energy dissipation bumper shock absorber and shed hole board, the back timber, reduces the mountain and collapses the lateral displacement who assaults the in-process, can also reduce the rigid contact between energy dissipation bumper shock absorber and shed hole board, the back timber in addition, and effectual protection contact surface is not damaged.
Furthermore, a side wall is arranged on one side, away from the mountain body, of the shed hole plate, and a groove-shaped structure used for installing the composite buffer cushion layer is formed between the side wall and the mountain body.
And further, after the waterproof layer is manufactured in the step 2, measuring and marking the corresponding positions of the foam cushion layer, the steel plate layer and the geocell reinforced soil layer according to the design requirements.
Further, in step 3, when the thickness of the single-layer foam cushion layer does not reach the designed thickness, the foam blocks can be laid in a stacking mode, and the foam blocks are in staggered joint overlapping.
Further, the foam cushion layer is expandable polyethylene foam, and the thickness of the foam cushion layer is less than half of the total thickness of the cushion layer.
Furthermore, the geocell is a geocell with lateral water permeable holes, and the side wall at the top of the shed tunnel slab is provided with corresponding drain holes.
Furthermore, the drain holes are divided into two types and are respectively arranged at the bottom of the geocell layer and the bottom of the foam layer.
Compared with the prior art, the invention has the beneficial effects that:
(1) the geocell utilizes the three-dimensional honeycomb structure to limit the lateral displacement of the soil layer, effectively disperses the concentration effect of impact force, and therefore improves the energy absorption and shock absorption effects of the soil layer. Under the same shock resistance design condition, the thickness of the geocell reinforced soil layer is lower than that of the traditional soil layer, and the dead weight of the buffer layer can be effectively reduced. Meanwhile, the geocell with the drainage hole does not influence the drainage of the soil body.
(2) The Expandable Polyethylene (EPE) foam cushion layer is soft, light and flexible, can be bent to absorb and disperse external impact force, and overcomes the defects of frangibility, deformation and poor resilience of common foam plastics. When replacing a part of the thickness of the soil layer of the traditional buffer layer, the structure deadweight can be reduced, the elastic deformation can be utilized to absorb energy, and the buffer effect is good.
(3) The setting of steel sheet layer can protect the foam cushion layer, and the steel sheet layer will concentrate the power dispersion, alleviates the plastic damage of foam cushion layer, improves the life of foam cushion layer.
(4) The double-layer metal cylinder is formed by welding a steel backing plate, a rubber gasket and a steel pipe and is connected with a shed hole plate and a top beam through high-strength expansion bolts. Simple manufacture and convenient field construction. The double-layer metal cylinder absorbs impact energy by means of self-telescoping deformation and improves the impact resistance of the shed tunnel structure under the combined action of the double-layer metal cylinder and the composite buffer cushion layer.
(5) The energy-consuming and shock-absorbing combined structure has the advantages of small self weight, simple and convenient construction, low cost and good buffering effect.
Drawings
FIG. 1 is a schematic structural view of an energy-dissipating and shock-absorbing combined shed tunnel for resisting landslide collapse body impact.
Fig. 2 is a schematic structural view of the dissipative vibration damper according to the invention.
Fig. 3 is a schematic view of a partial structure of the dissipative vibration damper according to the invention.
In the figure: 1-waterproof layer, 2-foam cushion layer, 3-steel plate layer, 4-geocell, 5-soil layer, 6-energy dissipation damper, 7-drainage hole of shed tunnel side wall, 8-inner steel pipe, 9-outer steel pipe and 10-steel backing plate.
Detailed Description
The energy dissipation and shock absorption combined structure and the construction method of the invention are described in detail below with reference to the accompanying drawings and preferred examples as follows:
as shown in fig. 1-3, the top beam is disposed on two sides (i.e., near one side of the hill and far from one side of the hill) of the ground to be protected, and the shed tunnel plate is supported on the top of the top beam through the energy dissipation damper to form the shed tunnel structure resisting the impact of the landslide collapse body. The composite cushion layer comprises a foam cushion layer 2, a steel plate layer 3, geocells 4 and a soil layer 5, and the composite cushion layer is sequentially laid on a waterproof layer 1 on the top surface of the shed tunnel plate from bottom to top, wherein the geocells 4 and the soil layer 5 are mixed to form a geocell reinforced soil layer. Energy dissipation bumper shock absorber 6 is a metal double-deck cylinder section of thick bamboo, sets up between canopy hole board and back timber, and energy dissipation bumper shock absorber 6's a specific structure includes nested interior steel pipe 8 and outer steel pipe 9, the top and the bottom of interior steel pipe 8 and outer steel pipe 9 have all welded steel backing plate 10, form double-deck metal cylinder section of thick bamboo structure, during the installation, are equipped with the rubber packing ring that is used for the second grade absorbing between steel backing plate 10 and canopy hole board and back timber respectively, then are connected steel backing plate 10 with canopy hole board and back timber through the expansion bolts that excels in. A foam cushion layer 2 made of expandable polyethylene foam (EPE) is laid on the waterproof layer 1. The steel plate layer 3 is a thin steel plate layer, and the surface of the thin steel plate layer is subjected to rust prevention treatment. The geocell 4 is a geocell with lateral water permeable holes, and the precipitation can be discharged through the water permeable holes of the geocell 4 and the drainage holes 7 of the side wall of the shed tunnel. The side, far away from the mountain body, of each shed hole plate is provided with a side wall, a groove-shaped structure used for installing the composite cushion layer is formed between each side wall and the mountain body, and shed hole side wall drain holes 7 are formed in side walls at the bottom of the geocell reinforced soil layer and the bottom of the foam layer.
The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting landslide collapse body impact is provided.
Collapse of the top of a hillside slope on one side of a road, and on-site investigation: the surface tension cracks in the deformation range are numerous, the front edge collapses in a small scale, the rear edge slips downwards, the substances on the surface of the hillside are loose, and the stability is poor. The upstream side of the deformable ridge collapses on a small scale continuously, and part of stones roll off, so that the passing safety of the road below is seriously threatened.
The first step is as follows: during the construction of the shed tunnel, firstly, a top beam and a shed tunnel plate are prefabricated or cast in situ in a region to be constructed, and a metal double-layer cylindrical energy dissipation damper 6 is arranged between the shed tunnel plate and the top beam. The diameter of the inner shell of the metal double-layer cylinder is 180mm, the diameter of the outer shell is 250mm, the wall thickness is 6mm, and the length is 400 mm. And is connected with the shed slab and the top beam through high-strength expansion bolts.
The second step is that: after the construction of the shed tunnel plate is completed, the top surface of the shed tunnel plate is cleaned, a waterproof layer 1 is made, corresponding positions of a foam cushion layer 2, a steel plate layer 3, a geocell reinforced soil layer and a soil layer 5 are measured and marked according to design requirements, and the total design thickness of the composite buffer layer is 50 cm.
The third step: and laying a single layer of 5 cm-thick expandable polyethylene foam (EPE) on the waterproof layer 1 on the top surface of the shed tunnel to finish the construction of the foam cushion layer 2. The foam cushion layer 2 is laid in a stacking mode, the total thickness of the foam cushion layer is 15cm, and staggered joints among single-layer foam blocks are required to be overlapped.
The fourth step: and paving a thin steel plate layer 3 with the thickness of 3mm on the surface of the paved foam cushion layer 2, and performing rust prevention treatment on the thin steel plate layer 3.
The fifth step: and laying a geocell reinforced soil layer. The geocell 4 with the height of 10cm, the welding torch of 60cm and the wall thickness of 1mm and provided with the water permeable holes is fully stretched, tiled and unfolded on the steel plate layer 3, so that the phenomenon that the welding spot of the geocell 4 is cracked due to stress concentration caused by the uneven plane is avoided. Each geocell 4 at the end part is fixed by a pin, and soil is filled into the space of the geocell gradually until the total designed thickness of the composite buffer layer is 50cm after the space of the geocell is fully filled by soil.
The above description is only intended to illustrate the present invention, and not to limit the scope of the present invention. Various substitutions and modifications of the technical scheme proposed by the invention can be made by common technical knowledge and conventional means in the field without departing from the technical idea of the invention, and the technical scheme belongs to the protection scope of the invention.
Claims (9)
1. The utility model provides an energy consumption shock attenuation combination shed hole structure construction method that anti landslide body that collapses assaults, energy consumption shock attenuation combination shed hole structure include back timber, shed hole board, compound cushion layer and energy consumption bumper shock absorber, the back timber is located and is treated the ground both sides of protective area, the shed hole board supports the shed hole structure that anti landslide body that collapses assaults at the top of back timber through the energy consumption bumper shock absorber, compound cushion layer includes by foam cushion layer, steel sheet layer and the geocell that down laid in proper order in shed hole board top surface and adds the muscle soil layer, its characterized in that includes following step:
step 1: constructing a shed tunnel, namely constructing a top beam and a shed tunnel plate in an area to be constructed, and arranging an energy dissipation shock absorber between the shed tunnel plate and the top beam;
step 2: after the construction of the shed tunnel plate is finished, cleaning the top surface of the shed tunnel plate and making a waterproof layer;
and step 3: laying a foam cushion layer on the waterproof layer on the top surface of the shed tunnel;
and 4, step 4: paving a steel plate layer subjected to rust prevention treatment on the surface of the paved foam cushion layer;
and 5: and paving a geocell reinforced soil layer on the steel plate layer, fully stretching, flatly paving and unfolding the geocell on the steel plate layer, fixing each geocell at the end part by using a pin, fully filling the space of the geocell with soil, and gradually filling the soil to a corresponding design elevation to complete the construction of the energy-dissipation and shock-absorption combined shed and tunnel structure.
2. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 1, wherein the construction method comprises the following steps: in the step 1, the energy dissipation damper comprises an inner steel pipe and an outer steel pipe which are nested, and steel base plates are welded at the top and the bottom of the inner steel pipe and the bottom of the outer steel pipe to form a double-layer metal cylindrical structure.
3. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 2, wherein the construction method comprises the following steps: rubber gaskets for secondary shock absorption are respectively arranged between the upper steel base plate and the lower steel base plate of the energy dissipation shock absorber and between the shed hole plate and the top beam.
4. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 1, wherein the construction method comprises the following steps: one side, far away from the mountain body, of the shed hole plate is provided with a side wall, and a groove-shaped structure used for installing the composite buffer cushion layer is formed between the side wall and the mountain body.
5. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 4, wherein the construction method comprises the following steps: and (3) after the waterproof layer is manufactured in the step (2), measuring and marking the corresponding positions of the foam cushion layer, the steel plate layer and the geocell reinforced soil layer according to the design requirements.
6. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 4, wherein the construction method comprises the following steps: in step 3, when the thickness of the single-layer foam cushion layer does not reach the designed thickness, the foam blocks can be laid in a stacking mode, and the foam blocks are in staggered joint overlapping.
7. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 6, wherein the construction method comprises the following steps: the foam cushion layer is made of expandable polyethylene foam, and the thickness of the foam cushion layer is less than half of the total thickness of the cushion layer.
8. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 4, wherein the construction method comprises the following steps: the geocell is provided with lateral permeable holes, and the side wall at the top of the shed tunnel slab is provided with corresponding drain holes.
9. The construction method of the energy-consuming and shock-absorbing combined shed tunnel structure resisting the impact of landslide collapse bodies according to claim 8, wherein the construction method comprises the following steps: the drain holes are divided into two types and are respectively arranged at the bottom of the geocell layer and the bottom of the foam layer.
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Cited By (3)
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| CN112267391A (en) * | 2020-10-27 | 2021-01-26 | 西南交通大学 | Two-stage energy-consumption type shed tunnel supporting structure connected by adopting bucket arch principle and design method thereof |
| KR102280281B1 (en) * | 2021-01-05 | 2021-07-21 | 컨텍이앤씨 주식회사 | Precast rock shed tunnel using e fully integrated connection and the construction method therefor |
| CN113322844A (en) * | 2021-05-07 | 2021-08-31 | 交通运输部公路科学研究所 | Avalanche impact resistant shed tunnel with prefabricated retaining wall and assembled arch structure and construction method |
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