A ditch filling embankment road permanent temporary combined drainage system

Abstract

The application discloses a kind of valley fill embankment permanent temporary combination drainage systems, including roadbed layer, road surface layer is equipped on roadbed layer, and assembling type dropwell for leading and discharging water accumulated on road surface layer is equipped at one side of roadbed layer, and assembling type dropwell is connected with combined drainage blind ditch arranged in roadbed bottom, and water outlet end of combined drainage blind ditch is connected with drainage ditch, and terminal point of drainage ditch is connected to nearby stream ditch.The application has simple structure and strong operability, realizes surface water drainage through assembling type dropwell, combined with combined drainage blind ditch arranged in low-lying place of fill embankment bottom topography, forms vertical and horizontal and longitudinal combined drainage system suitable for any topography, has good drainage performance, good overall structural stability and high reliability;The drainage system can timely lead and discharge field area catchment outside roadbed range during construction, avoid construction and drainage interference, and can also collect and lead and discharge roadbed surface seepage, groundwater and the like outside roadbed range, avoid roadbed bottom water accumulation, and increase overall stability of roadbed.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of valley fill subgrade permanent temporary combination drainage system, belong to subgrade drainage technical field. BACKGROUND

[0002] In mountainous area highway engineering, by the influence of terrain condition, groundwater outcrop and surface water confluence, subgrade is often soaked by groundwater outcrop, surface water infiltrates and softens subgrade, especially in construction process, it is easy to be washed away and unstable by water flow. Blind ditch and culvert are usually used in engineering to drain rainwater outside the subgrade. In low-lying areas of local topography, the intersection of slope filling and excavation, after subgrade filling, surface water is easy to infiltrate along the intersection of filling and excavation, when the particle size of filling material is discontinuous and the filling material is uneven, soil flow or piping may occur, and the subgrade is unstable and damaged over time.

[0003] At present, the drainage blind ditch used in engineering is easy to be damaged by rolling during construction, and the clay particles continuously fill the blind ditch, which reduces the porosity and the drainage effect is not ideal. In addition, the drainage ditch is not designed after being drained from the subgrade, and the water flow often washes the subgrade slope foot and the nearby farmland or house, which causes disturbance to the nearby residents. In view of this, in order to meet the drainage requirements of subgrade base and subgrade in mountainous area, without affecting the construction of subgrade with different filling heights, effectively improve the temporary drainage capacity during subgrade construction and the groundwater drainage capacity during operation. The present application provides a kind of valley fill subgrade permanent temporary combination drainage system. SUMMARY

[0004] In view of this, the purpose of the present application is to provide a kind of valley fill subgrade permanent temporary combination drainage system, which can overcome the shortcomings of the prior art.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A kind of valley fill subgrade permanent temporary combination drainage system, including subgrade layer, road surface layer is provided on the subgrade layer, assembly type water drop well for draining water accumulated on road surface layer is provided on one side of the subgrade layer, assembly type water drop well is connected with combined drainage blind ditch arranged at subgrade base, water outlet end of combined drainage blind ditch is connected with drainage ditch, and the end point of drainage ditch is connected to nearby stream.

[0007] The aforementioned assembly type water drop well includes several prefabricated pipes that can be spliced together, the top end of the prefabricated pipe is provided with a water inlet, and the bottom end side is provided with a drainage hole for connecting the assembly type water drop well and the combined drainage blind ditch; positionally opposite and adapted clamping groove and clamping block structure are provided at both ends of the prefabricated pipe, so that the adjacent prefabricated pipes are buckled and limited in position, and are spliced together by adhesion.

[0008] The aforementioned assembled drop well comprises a plurality of assembled standard pipes, the top end of the upper standard pipe is detachably connected with a top pipe, and the bottom surface of the bottom standard pipe is fixedly connected with a blind pipe; the side of the blind pipe is provided with a drainage hole for connecting the assembled drop well and the combined drainage blind ditch.

[0009] The aforementioned assembled drop well is in I or Z type assembled structure, and a prefabricated well cover plate is detachably connected at the top of the assembled drop well.

[0010] The aforementioned combined drainage blind ditch comprises a main blind ditch and a plurality of intercepting blind ditches connected with the main blind ditch, the main blind ditch is arranged in a horizontal trench of a roadbed base, and the intercepting blind ditches are arranged in a longitudinal trench of the roadbed, at a groundwater outcrop point and at a filling-digging junction.

[0011] The aforementioned main blind ditch comprises a main trench with an open top, the main trench is filled with a gravel and pebble layer, and a main drainage conduit is arranged in the middle of the trench along the length direction of the trench, the bottom and the two side walls of the main trench are covered with a waterproof composite geomembrane, and the top is provided with a filter geotextile; the aforementioned intercepting blind ditch comprises an intercepting trench with an open top and an inner side, the intercepting trench is filled with a gravel and pebble layer, and an intercepting conduit is arranged in the middle of the trench along the length direction of the trench, the inner side and the upper side of the intercepting blind ditch are wrapped with a filter geotextile, and the bottom and the outer side are covered with a waterproof composite geomembrane.

[0012] The aforementioned main drainage conduit and intercepting conduit are each composed of a plurality of pipe segments connected through a joint; and the main drainage conduit and the intercepting conduit are steel pipes, plastic pipes or steel corrugated pipes with a plurality of water seepage holes.

[0013] For a less drainage area, the water inlet end of the aforementioned intercepting blind ditch is in an open structure; for a lateral branch ditch between mountains, a spring eye at the foot of a mountain body and a groundwater outcrop point, the water inlet end of the aforementioned intercepting blind ditch is in a closed structure, wherein the closed structure is assembled by using a prefabricated pipe for the assembled drop well.

[0014] A stress dispersion system is arranged above the aforementioned combined drainage blind ditch to avoid damage of the combined drainage blind ditch caused by rolling.

[0015] The aforementioned stress dispersion system comprises a plurality of layers of bidirectional plastic geogrids or steel-plastic geogrids.

[0016] Compared with the prior art, the disclosed ditch filling embankment permanent and temporary combined drainage system comprises an embankment layer, a pavement layer arranged on the embankment layer, and a spliced dropwell arranged on one side of the embankment layer and used for guiding and draining accumulated water on the pavement layer, wherein the spliced dropwell is connected with a combined drainage blind ditch arranged on the embankment base, the water outlet end of the combined drainage blind ditch is connected with a drainage ditch, and the terminal end of the drainage ditch is connected with a nearby stream ditch. In the system, the surface water in the site area is guided to the spliced dropwell through the side ditch, the interference of the embankment construction and the surface water is avoided, the exposed underground water and the infiltrated surface water are collected and drained to the stream ditch outside the embankment range by the combined drainage blind ditch, the preferable water content state of the filler in the embankment range is ensured, and the overall stability of the embankment is ensured. Preferably, the combined drainage blind ditch comprises a main blind ditch and a plurality of intercepting blind ditches which are connected with the main blind ditch, the main blind ditch is arranged in the transverse groove of the embankment base, and the intercepting blind ditches are arranged at the underground water exposure points and the filling and excavation junctions in the longitudinal groove of the embankment. The main blind ditch and the intercepting blind ditches can penetrate the transverse and longitudinal directions of the embankment base, and can guide and drain various water in the embankment range, such as spring eye, surface infiltrated water and surface water. More preferably, a stress diffusion system is arranged above the combined drainage blind ditch, the stress diffusion system is used for avoiding the combined drainage blind ditch from being crushed and damaged by the rolling, and the overall structural strength of the combined drainage blind ditch is increased, so that the combined drainage blind ditch is prevented from being deformed and damaged by the excessive extrusion during the embankment rolling.

[0017] The beneficial effects of the present application are:

[0018] The present application has the advantages of simple structure and strong operability. The surface accumulated water is guided and drained by the spliced dropwell, the combined drainage blind ditch arranged at the low-lying place of the embankment base is combined, a vertical and horizontal and longitudinal combined drainage system suitable for any terrain is formed, the drainage performance is good, the overall structural stability is good, and the reliability is high. The drainage system can guide and drain the water in the site area to the outside of the embankment range in time during the construction, the construction and drainage interference is avoided, the surface infiltrated water and underground water in the embankment are collected and drained to the outside of the embankment range, the water accumulation in the embankment base is avoided, and the overall stability of the embankment is increased.

[0019] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification and drawings. The objects and other advantages of the present application can be achieved and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings, in which:

[0021] Figure 1 The structural schematic diagram of the embodiment 1 of the present application is shown in the figure.

[0022] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0024] Figure 4 A cross-sectional schematic diagram of the main blind drain;

[0025] Figure 5 This is a schematic cross-sectional view of a drainage ditch.

[0026] Figure 6 This is an enlarged schematic diagram of the pipe jacking of a prefabricated drop well.

[0027] Figure 7 This is an enlarged schematic diagram of the standard pipe of a modular drop manhole.

[0028] Figure 8 An enlarged schematic diagram of the blind pipe of a prefabricated drop manhole;

[0029] Figure 9 This is an enlarged schematic diagram of a prefabricated manhole cover.

[0030] Figure 10 An enlarged schematic diagram of the main drainage pipe;

[0031] Figure 11 This is an enlarged schematic diagram of the water interception pipe;

[0032] Figure 12 This is an enlarged schematic diagram of the stress diffusion system. Detailed Implementation

[0033] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0034] Example 1,

[0035] like Figures 1-12 As shown, a combined permanent and temporary drainage system for gully embankment roadbed includes a roadbed base layer, on which a pavement layer is provided. On one side of the roadbed base layer, there is a prefabricated drop manhole 1 for draining water accumulated on the pavement layer. The prefabricated drop manhole 1 is connected to a combined drainage blind ditch set in the roadbed base. The outlet end of the combined drainage blind ditch is connected to a drainage ditch 4, and the end point of the drainage ditch 4 is connected to a nearby stream. Water collected can be drained into the nearby stream through the drainage ditch 4, achieving a better moisture content state of the fill material within the roadbed area and ensuring the overall stability of the roadbed.

[0036] A stress diffusion system 7 is provided above the combined drainage blind ditch to prevent deformation and damage of the combined drainage blind ditch when the roadbed is compacted.

[0037] The stress dispersion system 7 comprises a plurality of layers of bidirectional plastic geogrids or steel plastic geogrids arranged in layers.

[0038] Preferably, the number of layers of the stress dispersion system 7 can be arranged in 2-3 layers with a layer spacing of 50 cm-1 m in combination with the height of the embankment fill.

[0039] The assembled dropwell 1 comprises a plurality of prefabricated pipes that can be spliced together, the top end of the prefabricated pipe is provided with a water inlet, and the bottom end side is provided with a drainage hole for connecting the assembled dropwell 1 and the combined drainage blind ditch.

[0040] A clamping groove and a clamping block structure are arranged at the two ends of the prefabricated pipe, which are oppositely arranged and matched, so that the adjacent prefabricated pipes are buckled and limited in position, and are spliced together by adhesion.

[0041] Specifically, the assembled dropwell 1 comprises a plurality of spliced standard pipes 102, the top end of the upper standard pipe is detachably connected with a top pipe 101, and the bottom surface of the bottom standard pipe is fixedly connected with a blind pipe 103; the side of the blind pipe 103 is provided with a drainage hole for connecting the assembled dropwell 1 and the combined drainage blind ditch. A plurality of standard pipes 102 are arranged, which can increase the number of standard pipes 102 in the middle as the height of the embankment fill increases, the standard pipes 102 are cemented, and the top pipe 101 and the top standard pipe 102 can be spliced by bolts, which is convenient for subsequent flexible increase of the height of the dropwell.

[0042] The prefabricated pipe is a square pipe or a circular pipe.

[0043] The combined drainage blind ditch comprises a main blind ditch 2 and a plurality of intercepting blind ditches 3 connected with the main blind ditch, the main blind ditch 2 is arranged in the transverse trench of the embankment base, and the intercepting blind ditch 3 is arranged at the underground water outflow point and the filling-digging junction in the longitudinal trench of the embankment. Through the intercepting blind ditch 3, the accumulated water in the longitudinal trench of the embankment, the underground water outflow point and the filling-digging junction can be drained into the main blind ditch 2.

[0044] The main blind ditch 2 comprises a main trench with an open top, the main trench is filled with a gravel and pebble layer 10, and a main drainage guide pipe 5 is arranged in the middle of the trench along the length direction; the bottom and the two side walls of the main trench are covered with a waterproof composite geomembrane 9, and the top is provided with a filter geotextile 8, which is beneficial to the downward infiltration of pore water in the embankment range.

[0045] The water intercepting blind ditch 3 comprises a top and an inner side opening water intercepting groove filled with a sand and gravel layer 10, and a water intercepting pipe 6 is arranged in the middle of the groove along the length direction. The inner side and the upper side of the water intercepting blind ditch 3 are wrapped with a filter cloth 8, which is more conducive to the seepage of the base. The bottom and the outer side of the water intercepting blind ditch 3 are covered with a waterproof composite geomembrane 9. In combination with the terrain conditions of the site, the water intercepting blind ditch 3 is used to treat the lateral branch ditch and the filling and excavation junction, so as to facilitate the drainage of the water in the longitudinal groove of the route and the seepage of the water at the filling and excavation junction into the main blind ditch through the water intercepting blind ditch 3.

[0046] The main groove and the water intercepting groove are T-shaped grooves with a wide top and a narrow bottom.

[0047] The main drainage pipe 5 and the water intercepting pipe 6 are connected by a three-way joint 11, and the three-way joint 11 is arranged in a Y shape, which is more conducive to drainage. The main drainage pipe 5 and the water intercepting pipe 6 can be connected by a bend 12 to adapt to different curved valley terrains.

[0048] The main drainage pipe 5 and the water intercepting pipe 6 are steel pipes, plastic pipes or steel corrugated pipes with a plurality of water seepage holes. The size of the main drainage pipe 5 is slightly larger than that of the water intercepting pipe 6, so as to ensure smooth drainage.

[0049] The drainage ditch 4 outside the roadbed range is connected with the water outlet end of the drainage blind ditch 2 in the roadbed range. The drainage ditch 4 has the same trapezoidal structure as the main groove, which is more conducive to the seepage and drainage of the sand and gravel layer 10 in the main groove. The end of the drainage ditch 4 should be connected to a nearby stream to avoid water erosion of nearby farmland, houses and natural slopes, causing water damage.

[0050] Example 2

[0051] A prefabricated well cover plate 104 can be added to the pipe jacking 101. After the roadbed is filled to the design elevation in the intermountain groove, the surface drainage facilities are implemented according to the requirements. After the surface drainage facilities are improved, the assembled dropwell 1 should be closed with the prefabricated well cover plate 104 to reduce the drainage capacity of the main blind ditch 2 of the roadbed base, relieve the drainage pressure, and avoid the reverse seepage of the water flow in the main drainage pipe 5.

[0052] The water inlet end of the intercepting blind ditch 3 is of an open structure or a closed structure. Specifically, for a region with less drainage, the water inlet end of the intercepting blind ditch 3 is of an open structure; and for an intermountain lateral branch ditch, a spring eye at a slope foot of a mountain, and a point where underground water outcrops, the water inlet end of the intercepting blind ditch 3 is of a closed structure, which can be assembled by using a prefabricated pipe for the assembled stepped well 1 and specifically includes a blind pipe 103 and a prefabricated well cover plate 104 installed on the top of the blind pipe 103, wherein the drainage hole of the blind pipe 103 is in communication with the intercepting conduit 6. The sizes of the intercepting blind ditch 3 and the intercepting conduit 6 are determined in combination with the maximum flow of the spring eye, and when the calculated sizes are too large, the intercepting conduit 6 can be adjusted to a larger size steel corrugated pipe to meet the drainage requirement; and the intercepting blind ditch 3 is arranged to be inclined downward relative to the main blind ditch 2, and the inclination angle is preferably 5-10 degrees to increase the drainage capacity. Meanwhile, when the sizes of the intercepting blind ditch 3 and the intercepting conduit 6 are adjusted, the size of the main blind ditch 2 should be adjusted accordingly.

[0053] Embodiment 3

[0054] The assembled stepped well 1 is of an I or Z type assembled structure. When it is required to make the assembled stepped well 1 permanent drainage and the filling roadbed is high, the assembled stepped well 1 can be arranged to be of a Z type assembly, as shown in FIG. 4, to avoid that the vertical section of the assembled stepped well 1 is too high and the impact energy is too large. Meanwhile, the size of the main blind ditch 2 is increased, and the drainage conduit 5 in the main blind ditch 2 is arranged to be a steel corrugated pipe. Figure 3

[0055] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment without departing from the technical solution of the present application and according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.​

Claims

1. A combined permanent and temporary drainage system for gully embankment roadbeds, comprising a roadbed layer, on which a pavement layer is provided, characterized in that: A modular drop manhole (1) is provided on one side of the roadbed for draining water accumulated on the road surface. The modular drop manhole (1) is connected to a combined drainage blind ditch set on the roadbed base. The outlet end of the combined drainage blind ditch is connected to a drainage ditch (4), and the end of the drainage ditch (4) is connected to a nearby stream. The modular drop manhole (1) is an I or Z-shaped modular structure. A prefabricated manhole cover plate (104) is detachably connected to the top of the modular drop manhole (1). The modular drop manhole (1) includes several modular drop manholes. The standard pipe (102) has a top pipe (101) detachably connected to the top of the upper standard pipe and a blind pipe (103) fixed to the bottom surface of the bottom standard pipe; the blind pipe (103) has a drainage hole on its side that allows the assembled drop well (1) and the combined drainage blind ditch to communicate with each other; a stress diffusion system (7) is provided above the combined drainage blind ditch to prevent the combined drainage blind ditch from being crushed and damaged, and the stress diffusion system (7) includes a multi-layer bidirectional plastic geogrid or steel-plastic geogrid.

2. The combined permanent and temporary drainage system for gully embankment roadbeds according to claim 1, characterized in that: The modular drop well (1) includes several prefabricated pipes that can be spliced ​​together. The top of the prefabricated pipe is provided with an inlet, and the bottom side is provided with a drainage hole that allows the modular drop well (1) and the combined drainage blind ditch to communicate with each other. At both ends of the prefabricated pipe, there are slots and blocks that are positioned opposite each other and are compatible, so that adjacent prefabricated pipes are snapped and limited, and are spliced ​​together by bonding.

3. The combined permanent and temporary drainage system for gully embankment roadbeds according to claim 1, characterized in that: The combined drainage blind ditch includes a main blind ditch (2) and multiple intercepting blind ditches (3) that are interconnected with the main blind ditch. The main blind ditch (2) is set in the transverse trench of the roadbed base, and the intercepting blind ditches (3) are set in the longitudinal trench of the roadbed, at the groundwater outburst point and at the cut-fill junction.

4. The combined permanent and temporary drainage system for gully embankment roadbeds according to claim 3, characterized in that: The main blind drain (2) includes a main trench with an open top, which is filled with a layer of gravel and pebbles (10). A main drainage pipe (5) is provided in the middle of the trench along its length. The bottom and side walls of the main trench are covered with an impermeable composite geomembrane (9), and a reverse filter geotextile (8) is provided on the top. The intercepting blind drain (3) includes an intercepting trench with an open top and inner side, which is filled with a layer of gravel and pebbles (10). A intercepting pipe (6) is provided in the middle of the trench along its length. The inner and upper sides of the intercepting blind drain (3) are wrapped with a reverse filter geotextile (8), and the bottom and outer sides are covered with an impermeable composite geomembrane (9).

5. The combined permanent and temporary drainage system for gully embankment roadbeds according to claim 4, characterized in that: The main drainage pipe (5) and the water intercepting pipe (6) are both composed of several pipe sections spliced ​​together by splicing joints; and the main drainage pipe (5) and the water intercepting pipe (6) are steel pipes, plastic pipes or corrugated steel pipes with several seepage holes.

6. The combined permanent and temporary drainage system for gully embankment roadbeds according to claim 5, characterized in that: For areas with less drainage, the water inlet of the intercepting blind ditch (3) is an open structure; for lateral tributaries in the mountains, springs at the foot of the mountain slope, and groundwater outcrops, the water inlet of the intercepting blind ditch (3) is a closed structure, wherein the closed structure is assembled from prefabricated pipes used in the assembled drop well (1).

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