阅读说明：本技术 一种上坝公路施工期低线公路保通施工方法 (Construction method for keeping low-line highway open in construction period of upper dam highway ) 是由 史红伟 郭文峰 范兴利 李瑞祥 吴栋 秦择端 于 2020-05-20 设计创作，主要内容包括：本发明专利属于水利水电工程技术领域,涉及一种上坝公路施工期低线公路保通施工方法。包括如下步骤：施工准备→低线公路防护→高线公路清表→高线公路测量放样→高线公路逐层开挖→高线公路边坡修整→高线公路装运土石方→高线公路开挖两侧边沟→高线公路路槽整修、碾压成型。本发明施工方法主要适用于各类既有高线公路施工低线公路正常通行的穿越的施工方法,本方法主要采用工字钢为纵立杆于横梁配合钢管形成防护棚的方法,确保高线公路在施工时,低线公路能正常通行。(The invention belongs to the technical field of hydraulic and hydroelectric engineering, and relates to a construction method for protecting the traffic of a low-line road in the construction period of an upper dam road. The method comprises the following steps: construction preparation → low-line road protection → high-line road surface clearing → high-line road measurement lofting → high-line road excavation layer by layer → high-line road slope trimming → high-line road earth and stone carrying → high-line road excavation both side ditches → high-line road groove trimming and rolling molding. The construction method is mainly suitable for the construction method for normal passing of the low-line highway constructed on various existing high-line highways, and the method mainly adopts a method that I-shaped steel is used as a longitudinal upright rod, a cross beam is matched with a steel pipe to form a protective shed, so that the low-line highway can normally pass when the high-line highway is constructed.)

1. A construction method for keeping a low-line highway open in a dam-climbing highway construction period is characterized by comprising the following steps:

(1) according to a design drawing, combining the actual elevation of the low-line highway on site, and checking and calculating the height of each protection shed and the required material of the steel arch frame according to different positions and different elevations;

(2) determining the protection position of the low-line highway by combining the trend of the upper-line highway;

(3) and for the high-speed line road cutting construction road section with higher excavation height, the layered excavation is adopted, and different heights are divided into a plurality of steps to be excavated simultaneously.

(4) The method for the excavation blasting of the cut of the highway on the upper line adopts a method combining deep hole loosening control blasting and presplitting blasting;

(5) the on-line highway stone-filling embankment adopts layered horizontal filling, layered compaction and manual filling and leveling by matching with fine stones and stone chips in individual uneven places.

2. The method for constructing a low-line road according to claim 1, wherein the method comprises the following steps: the door opening headroom of the protection shed is 5.2m, the distance between the first protection shed upright post supports is 1.5m, the distance between the second protection shed upright post supports is 1.5m, the first protection shed upright post supports and the second protection shed upright post supports are welded by adopting angle steel in succession to form a main bearing framework, and a 20mm thick steel plate is paved on the bearing framework to form a sealing layer and a water-resisting layer.

3. The method for constructing a low-line road according to claim 1, wherein the method comprises the following steps: in the step (2), a leica TS06uitra-2 total station is adopted as a measuring instrument used in the measurement of the amount of the protection section of the low-line highway.

4. The method for constructing a low-line road according to claim 1, wherein the method comprises the following steps: and (3) excavating and transporting the earth by using an excavator matched with a 15t self-unloading automobile.

5. The method for constructing a low-line road according to claim 1, wherein the method comprises the following steps: in the step (4), the blasting adopts step blasting, adopts a non-electric millisecond differential blasting network scheme, respectively arranges a blasting point at the upstream and the downstream, simultaneously detonates, uses an electric detonator to form a delay blasting network in a hole outside the hole, is connected with a detonating cord outside the hole, detonates by using an MS11 non-electric millisecond differential detonator in the hole, and uses an MS3 millisecond differential detonator to relay outside the hole.

Technical Field

The invention belongs to the technical field of hydraulic and hydroelectric engineering, and relates to a construction method for protecting the traffic of a low-line road in the construction period of an upper dam road.

Background

In the construction process of the upper line dam-winding road, pedestrians and vehicles on the low-line highway can not normally pass, so that traffic control measures are required to be taken. Aiming at the requirements that an on-line road needs to be normally constructed and excavated and a low-line road needs to be ensured to normally pass, if the on-line road still adopts the traditional method, the risk that the road surface of the low-line road is beset by falling stones can exist, normal passing vehicles can not pass in a traffic control period, great potential safety hazards exist, meanwhile, the emotion of local passers is also increased, negative effects are brought to companies, and the investment of road warning personnel is greatly increased.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a construction method for protecting the traffic of a low-line road in the construction period of an upper dam road. The problem of there are attachments such as low line highway below the highway position section of line in former design, cause must be temporarily to low line highway control, cause personnel's input cost to increase etc is solved. The construction method is mainly suitable for the construction method for normal passing of the low-line highway constructed on various existing high-line highways, and the method mainly adopts a method that I-shaped steel is used as a longitudinal upright rod, a cross beam is matched with a steel pipe to form a protective shed, so that the low-line highway can normally pass when the high-line highway is constructed.

In order to achieve the purpose, the invention adopts the following technical scheme: a construction method for keeping a low-line highway open in a dam-climbing highway construction period comprises the following steps:

(1) according to a design drawing, combining the actual elevation of the low-line highway on site, and checking and calculating the height of each protection shed and the required material of the steel arch frame according to different positions and different elevations;

(2) determining the protection position of the low-line highway by combining the trend of the upper-line highway;

(3) and for the high-speed line road cutting construction road section with higher excavation height, the layered excavation is adopted, and different heights are divided into a plurality of steps to be excavated simultaneously.

(4) The method for the excavation blasting of the cut of the highway on the upper line adopts a method combining deep hole loosening control blasting and presplitting blasting;

(5) the on-line highway stone-filling embankment adopts layered horizontal filling, layered compaction and manual filling and leveling by matching with fine stones and stone chips in individual uneven places.

The door opening headroom of the protection shed is 5.2m, the distance between the first protection shed upright post supports is 1.5m, the distance between the second protection shed upright post supports is 1.5m, the first protection shed upright post supports and the second protection shed upright post supports are welded by adopting angle steel in succession to form a main bearing framework, and a 20mm thick steel plate is paved on the bearing framework to form a sealing layer and a water-resisting layer.

In the step (2), a leica TS06 uitra-2' total station is adopted as a measuring instrument used in the measurement of the amount of the protection section of the low-line highway.

And (3) excavating and transporting the earth by using an excavator matched with a 15t self-unloading automobile.

In the step (4), the blasting adopts step blasting, adopts a non-electric millisecond differential blasting network scheme, respectively arranges a blasting point at the upstream and the downstream, simultaneously detonates, uses an electric detonator to form a delay blasting network in a hole outside the hole, is connected with a detonating cord outside the hole, detonates by using an MS11 non-electric millisecond differential detonator in the hole, and uses an MS3 millisecond differential detonator to relay outside the hole.

Compared with the prior art, the invention has the beneficial effects that: (1) the protection shed is adopted to reduce resource investment and effectively avoid the problem of personnel management and control of low-line vehicles on the premise of ensuring the safety of low-line road vehicles and pedestrians.

(2) Adopt the bench blasting, greatly increased blasting efficiency, shortened the excavation time, practiced thrift construction cost.

(3) The reasonable equipment configuration improves the outward transportation efficiency of the stone slag.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

Fig. 1 is a schematic front view of the present invention.

FIG. 2 is a schematic side view of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.

Referring to fig. 1-2, a method for constructing a low-line highway during construction of an upper-dam highway includes the following steps:

(1) according to a design drawing, combining the actual elevation of the low-line highway on site, and checking and calculating the height of each protection shed and the required material of the steel arch frame according to different positions and different elevations;

(2) determining the protection position of the low-line highway by combining the trend of the upper-line highway;

(3) and for the high-speed line road cutting construction road section with higher excavation height, the layered excavation is adopted, and different heights are divided into a plurality of steps to be excavated simultaneously.

(4) The method for the excavation blasting of the cut of the highway on the upper line adopts a method combining deep hole loosening control blasting and presplitting blasting;

(5) the on-line highway stone-filling embankment adopts layered horizontal filling, layered compaction and manual filling and leveling by matching with fine stones and stone chips in individual uneven places.

The door opening clearance height of protection canopy is 5.2m, and the interval between protection canopy upright post support 11 is 1.5m, and the interval between protection canopy upright post support two 12 is 1.5m, and protection canopy upright post support 11 and protection canopy upright post support two 12 adopt the angle steel to weld in succession, form main bearing skeleton, and 20mm thick steel sheet forms enclosed bed and water barrier on the bearing skeleton.

In the step (2), a leica TS06 uitra-2' total station is adopted as a measuring instrument used in the measurement of the amount of the protection section of the low-line highway.

In the step (3), earth excavation is carried out by matching a 220-ton excavator with a 15-ton dump truck.

In the step (4), the blasting adopts step blasting, adopts a non-electric millisecond difference blasting network scheme, respectively arranges a blasting point at the upstream and the downstream, and simultaneously detonates. The electric detonator is used for detonation, a delay detonation network is arranged in the micro-difference hole outside the hole, the hole is connected with the detonating cord outside the hole, the non-electric micro-difference millisecond detonator MS11 is used for detonation in the hole, and the micro-difference millisecond detonator MS3 is used for relay outside the hole.

The present invention will be further described with reference to the accompanying drawings and the embodiments of highway excavation and blasting.

The construction process flow comprises the following steps: construction preparation → low-line road protection → high-line road surface clearing → high-line road measurement lofting → high-line road excavation layer by layer → high-line road slope trimming → high-line road earth and stone carrying → high-line road excavation both side ditches → high-line road groove trimming and rolling molding.

The method comprises the following specific steps:

(1) construction preparation: the design of construction drawings is carefully developed, training is given to constructors for dealing with the construction, detection and acceptance are carried out on related mechanical equipment, the starting point and the terminal point of a section of the low-line highway needing protection and the trend of the high-line highway are planned, the turning radius and the slope ratio are ensured to meet the standard requirements, and the all-round protection of the low-line highway is ensured.

(2) Protection of low-line roads: and measuring the protective sections of the low-line highway according to the trend of the high-line highway. The protection adopts the protection canopy to protect the upper part and the side surface of the low-line highway, and a closed safety passage is formed.

Wherein, the upright post bracket 1 of the protective shed is erected by 20A I-steel, the upright post bracket 1 of the protective shed comprises a first upright post bracket 11 of the protective shed and a second upright post bracket 12 of the protective shed, the distance between the first upright post bracket 11 of the protective shed and the second upright post bracket 12 of the protective shed is 4.5m, the height of the first upright post bracket 11 of the protective shed at one side close to a mountain body is 6m, the height of the second upright post bracket 12 of the protective shed at the side close to a river is 5m, the bottom of the upright post bracket 1 of the protective shed is fixedly connected with a road structure layer 4 through a base steel plate 2, the size of the base steel plate 2 is 0.4 multiplied by 0.4m, the base steel plate 2 is fixedly connected with the road structure layer 4 through expansion bolts, then upright post base concrete is poured to form a concrete base 3, the size of the concrete base 3 is 0.6 multiplied by 0.5m, the first upright post bracket 11 of the protective shed and the second upright post bracket 12 of the protective shed are both formed by 20, the interval between protection canopy stand support 11 is 1.5m, the clearance between protection canopy stand support two 12 is 1.5m, protection canopy stand support 11 and the fixed horizontal steel pipe 61 of protection canopy stand support two 12 sides and slant steel pipe 62, horizontal steel pipe 61 level sets up and horizontal steel pipe 61 and protection canopy stand support 11 and protection canopy stand support two 12 looks fixed connection, the rigid pipe 62 of slant is the form of x ", the rigid pipe 62 of slant is fixed in protection canopy stand support 11 and protection canopy stand support two 12 lateral walls, horizontal steel pipe 61 and slant steel pipe 62 all select the steel pipe that the diameter is 42mm for use.

The upper part of the upright post bracket 1 of the protective shed is fixed with a top surface 5, the top surface 5 comprises a sealing layer 51 and a supporting frame 52, the sealing layer 51 is a steel plate with the thickness of 20mm, and the sealing layer and the supporting frame 52 are welded and fixed to form a whole; in the coming direction, a continuous vibration deceleration strip is arranged, and an elevation limiting frame is arranged at the position 50m away from the inlet of the protective shed, wherein the elevation limiting frame is 5.0m away from the inlet of the protective shed;

(3) clearing the high-speed highway: before the construction of the high-speed highway subgrade, removing turf and tree roots in the excavation and backfilling range by adopting a manually-matched back shovel according to the excavation range of the subgrade released from a planned route, removing sediments in the original pits of the subgrade, backfilling the subgrade in layers by using qualified fillers, and tamping the subgrade in layers to ensure that the compaction degree is not less than 90%;

(4) measuring and lofting the highway with the high speed line: before the roadbed construction, the concrete positions of the road surface, the slope protection and the like are measured according to the central line of the route, a roadbed design chart, a construction process and relevant regulations. Setting control piles at a distance of 3.5 m from the center of the road, marking the number of the piles and the filling and digging height of the center of the road, indicating filling with (+) and digging with (-) on the piles;

(5) excavating the high-speed line road layer by layer: because the cutting subgrade slope of the highway with high altitude has large excavation depth, small width and short length, two ends of the cutting subgrade slope are excavated with the same inch by adopting a multi-layer transverse full-width excavation method, and the excavation is carried out according to the principle of longitudinal segmentation, horizontal layering, high-to-low advance and gradual-settlement construction. During excavation, slope putting is carried out on the side slope according to the slope ratio of a drawing, and the excavation depth of each layer is controlled to be about 2.5 m;

(6) trimming high-speed line highway side slope: the high-speed line road cutting slope is a high slope, construction is carried out in a cutting excavation process in a mode of excavation and finishing, a 10cm thick protective layer is reserved for the slope during excavation, and manual finishing treatment is carried out;

(7) loading earth and stone on the highway: high-speed line highway stone slag is loaded by a backhoe, a 15t dump truck is used for transporting a filling road section for accumulation, and waste materials (organic soil and humus soil) and redundant slag materials are transported to a slag field appointed by a proprietor;

(8) excavating side ditches on two sides of the high-speed line road: in order to reduce the phenomenon that the subgrade is soaked by rainwater and seepage water, after the excavation of the cut subgrade side slope is finished, the side ditches on the two sides of the subgrade bed are immediately excavated, and the excavation is carried out by adopting a small back-hoe in manual cooperation. Marking according to the gradient of a drawing and the elevation of the trench bottom, reserving a 15cm protective layer in the excavation process, and constructing in a manual excavation mode;

(9) refitting and rolling molding of highway grooves: after the subgrade bed is excavated, a manual loader and an excavator are matched for local range trimming, the road roller rolls according to a drawing cross slope, when the rolling is finished for one section, the rolling is continued for the second time in a longitudinal regressive mode, and when the regressive rolling is finished, joints between two lines are overlapped for 1/4-1/3 turns.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.