CN108914718B - Construction method for foundation preformed hole structure of high-speed railway reinforced earth retaining wall subgrade contact net - Google Patents
Construction method for foundation preformed hole structure of high-speed railway reinforced earth retaining wall subgrade contact net Download PDFInfo
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- CN108914718B CN108914718B CN201810583077.4A CN201810583077A CN108914718B CN 108914718 B CN108914718 B CN 108914718B CN 201810583077 A CN201810583077 A CN 201810583077A CN 108914718 B CN108914718 B CN 108914718B
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- guard ring
- foundation
- contact net
- retaining wall
- preformed hole
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- 238000010276 construction Methods 0.000 title claims abstract description 30
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 238000003780 insertion Methods 0.000 claims abstract description 9
- 230000037431 insertion Effects 0.000 claims abstract description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 57
- 239000004576 sand Substances 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 239000002689 soil Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000669 biting effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
Abstract
A construction method of a reserved hole structure of a foundation of a high-speed railway reinforced earth retaining wall subgrade contact net is used for effectively protecting a retaining wall reinforced body and avoiding damage to the retaining wall reinforced body during construction of a contact net upright column foundation. The reinforcement subgrade filling body is internally embedded with a preformed hole guard ring at the upright post foundation position of the contact net, the top surface of the preformed hole guard ring is exposed out of the roadbed surface, and the bottom surface of the preformed hole guard ring extends to the elevation of the upright post foundation of the contact net. The preformed hole guard ring is composed of vertically stacked guard ring units, the plane projection of each guard ring unit is a rectangular frame with two transverse side strips and two longitudinal side strips, and the two transverse side strips and the two longitudinal side strips form a rectangular middle hole for pouring upright column foundation concrete of the contact net. The geofence is stuck between the end surfaces of two adjacent guard ring units and is totally or partially cut off the inner part of the rectangular middle hole. Vertical insertion holes are longitudinally formed in the transverse strake at intervals, and inserted bolt reinforcing steel bars inserted into the vertical insertion holes penetrate through the ring units and the geogrid.
Description
Technical Field
The application relates to a railway reinforced earth retaining wall roadbed, in particular to a construction method of a foundation preformed hole structure of a high-speed railway reinforced earth retaining wall roadbed contact net.
Background
Since the introduction of the reinforced soil technology in the 70 th century of 20 th, the reinforced soil technology has been widely applied to various engineering fields. Especially, the geogrid reinforced retaining wall is widely applied to the fields of railways, highways, municipal administration, airports and the like based on the characteristics of economy, stability, convenience, good adaptability, attractive appearance and the like and good engineering characteristics. The geogrid reinforced retaining wall uses the geogrid as a reinforcement material, and provides pulling resistance through the special embedding effect and the biting effect of meshes on soil, so that the structure is stable.
The good working state of the reinforcement body is the precondition of safety and stability of the geogrid reinforcement retaining wall structure. In the current railway construction, foundation net stand columns and foundation construction thereof are often delayed from the construction of roadbed structures, and the built retaining wall reinforcement body is damaged when the foundation of the contact net stand columns is constructed, so that the stability of the reinforced earth retaining wall is affected.
In order to solve the problem that the reinforcement body of the reinforced earth retaining wall roadbed is damaged during construction of the upright post foundation of the overhead line system, the inventor designs a reserved hole of the reinforced earth retaining wall overhead line system foundation of the high-speed railway, and the reinforcement body of the retaining wall is prevented from being damaged during construction of the post upright post foundation of the overhead line system by synchronously burying the guard rings.
Disclosure of Invention
The application aims to solve the technical problem of providing a construction method of a reserved hole structure of a roadbed contact net foundation of a reinforced earth retaining wall of a high-speed railway, so as to effectively protect the reinforcing body of the retaining wall and avoid the retaining wall from being damaged during the construction of a column foundation of the contact net.
The technical scheme adopted by the application for solving the technical problems is as follows:
the application relates to a construction method of a foundation preformed hole structure of a contact net of a reinforced earth retaining wall roadbed of a high-speed railway, wherein the reinforced earth retaining wall roadbed comprises retaining wall panels at two sides and a sand pebble inverted filter layer positioned behind the retaining wall panels at the two sides, and a reinforced roadbed filling body for paving geogrids at vertical intervals in the reinforced earth retaining wall roadbed is arranged between the sand pebble inverted filter layers at two sides; the reinforcement subgrade filling body is internally embedded with a preformed hole guard ring at the upright post foundation position of the contact net, the top surface of the preformed hole guard ring is exposed out of the roadbed surface, and the bottom surface of the preformed hole guard ring extends to the elevation of the upright post foundation of the contact net; the preformed hole guard ring is composed of vertically stacked guard ring units, the plane projection of each guard ring unit is a rectangular frame with two transverse side strips and two longitudinal side strips, and the two transverse side strips and the two longitudinal side strips form a rectangular middle hole for pouring upright column foundation concrete of the contact net; the geofence voltage is stuck between the end surfaces of two adjacent guard ring units and is totally or partially cut off the inner part of the rectangular middle hole; vertical insertion holes are longitudinally formed in the transverse side bars at intervals, and bolt steel bars inserted into the vertical insertion holes penetrate through the guard ring units and the geogrid to enable the guard ring units to form a stable assembly;
the construction method comprises the following steps:
(1) filling the reinforced roadbed filling body to the elevation of the bottommost layer guard ring unit in a layered manner, digging a groove, leveling, hoisting and placing the bottommost layer guard ring unit, paving a layer of geogrid on the bottommost layer guard ring unit, cutting off the inner part of a rectangular middle hole of the geogrid, and inserting bolt reinforcing steel bars into each vertical jack;
(2) filling a layer of filler to the height of the upper layer of geogrid, digging a groove, leveling, hoisting one or two retainer units for placing the layer, paving the layer of geogrid, cutting off the inner part of a rectangular middle hole of the geogrid, and inserting bolt reinforcing steel bars into each vertical jack of the installed retainer units;
(3) repeating the steps until all retainer units in the reinforced roadbed filling body are installed and are installed to the elevation of the waterproof cushion layer;
(4) a waterproof cushion layer is paved, so that a composite geomembrane is pressed between the end surfaces of the two guard ring units, and the inner part of a rectangular middle hole is cut off;
(5) installing the guard ring unit until the uppermost top surface of the guard ring unit is exposed out of the road base surface, and inserting bolt steel bars into each vertical jack of the installed guard ring unit to form a preformed hole guard ring whole;
(6) filling the surface layer of the foundation bed.
The method has the beneficial effects that the damage to the rib materials in the reinforced retaining wall caused by post-construction of the upright post foundation of the overhead contact system can be effectively avoided, and the stability of the retaining wall is ensured not to be influenced by the post-construction; the guard ring unit is prefabricated, so that the construction is convenient; the size of the retainer is adjusted, so that the retainer is applicable to the foundations of different foundation nets and has good practicability and universality.
Drawings
The specification includes the following five drawings:
FIG. 1 is a cross-sectional view of a retainer unit in a construction of a foundation preformed hole of a reinforced earth retaining wall subgrade contact net of a high-speed railway;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic diagram of a forming mode of a contact net foundation filling cavity in a contact net foundation preformed hole structure of a reinforced earth retaining wall roadbed of a high-speed railway;
FIG. 4 is a cross-sectional view of a construction of a foundation preformed hole of a high-speed railway reinforced earth retaining wall subgrade contact net;
fig. 5 is a schematic diagram of the laying and cutting modes of the geogrid in the foundation preformed hole structure of the reinforced earth retaining wall contact net of the high-speed railway.
In the figure, the marks and the corresponding names are as follows: the retaining wall panel 1, the sand pebble reverse filtering layer 2, the coarse sand layer 3 in the upper layer, the composite geomembrane 4, the coarse sand layer 5 in the lower layer, the geogrid 6, the retaining wall cap stone 7, the road shoulder 8, the cable trough 9, the retainer unit 11, the rectangular middle hole 12, the vertical jack 13, the bolt steel bar 14, the nylon rope 15, the contact net column foundation 20, the foundation bed surface layer 21 and the road base surface 22.
Description of the embodiments
The application will be further described with reference to the drawings and examples.
The reinforced earth retaining wall roadbed contact net foundation preformed hole structure of the high-speed railway is shown by referring to fig. 1 to 5, the reinforced earth retaining wall roadbed comprises two side retaining wall panels 1 and a sand and pebble inverted filter layer 2 positioned behind the two side retaining wall panels, and a reinforced roadbed filling body with geogrid 6 paved between the two side sand and pebble inverted filter layers 2 at vertical intervals in the reinforced earth retaining wall roadbed. The reinforced roadbed filling body is internally embedded with a preformed hole guard ring at the position of the contact net upright post foundation 20, the top surface of the preformed hole guard ring is exposed out of the roadbed 22, and the bottom surface extends to the height of the contact net upright post foundation 20. The preformed hole retainer is composed of vertically stacked retainer units 11, the plane projection of each retainer unit 11 is a rectangular frame with two transverse side strips and two longitudinal side strips, and the two transverse side strips and the two longitudinal side strips form a rectangular middle hole 12 for pouring concrete of a contact net upright post foundation 20. The geogrid 6 is pressed between the end surfaces of two adjacent guard ring units 11, and is totally or partially cut off the inner part of the rectangular middle hole 12. Vertical insertion holes 13 are longitudinally formed in the transverse side strips at intervals, and inserted bolt reinforcing steel bars 14 inserted into the vertical insertion holes 13 penetrate through the ring units 11 and the geogrid 6, so that the retainer units form a stable assembly. .
Referring to fig. 3 and 4, a preformed hole guard ring formed by a plurality of guard ring units 11 is provided below the road surface 22 at the position of the contact net column foundation 20, each guard ring unit 11 is stacked layer by layer, each geogrid 6 through which the preformed hole guard ring passes is pressed between the end surfaces of two adjacent guard ring units 11, and a stable assembly is formed by the bolt steel bars 14. The geogrid 6 in the rectangular middle hole 12 is completely or partially cut off to form a cavity for pouring concrete of the contact net column foundation 20, and the geogrid 6 cannot be damaged when the contact net column foundation 20 is constructed in the later period, so that the stability of the reinforced retaining wall is not influenced by the construction in the later period.
Referring to fig. 3 and 4, the retainer units 11 have a height equal to the vertical spacing of the adjacent two layers of geogrids 6. For convenient lifting construction, the height of the guard ring unit 11 is equal to 1/2 of the vertical spacing between two adjacent layers of geogrids 6.
Referring to fig. 5, two geogrids 6 are longitudinally paved at the rectangular middle hole 12, and are bound and connected into a whole through nylon ropes 15. In the rectangular middle hole 12, the geogrid 6 is cut off along the inner walls of the two longitudinal strakes and the inner wall of the transverse strakes at the side far away from the sandy pebble reverse filtering layer 2, a transverse rib is reserved at the transverse strakes at the side near the sandy pebble reverse filtering layer 2 in the rectangular middle hole 12, and the rest part is cut off. When the contact net upright post foundation 20 is constructed in the later period, a reserved transverse rib and casting concrete are fixedly combined into a whole, so that the pulling resistance of the geogrid 6 is enhanced.
Referring to fig. 4, a waterproof cushion layer and a foundation bed surface layer 21 are sequentially paved above the top surface of the reinforced roadbed filling body, wherein the waterproof cushion layer is composed of an upper middle coarse sand layer 3, a composite geomembrane 4 and a lower middle coarse sand layer 5. The composite geomembrane 4 is pressed between the end surfaces of two adjacent retainer units 11, and is cut away from the inner part of the rectangular middle hole 12.
Referring to fig. 4, the construction method of the foundation preformed hole structure of the reinforced earth retaining wall subgrade contact net of the high-speed railway comprises the following steps:
(1) filling the reinforced roadbed filling body to the height of the bottommost layer guard ring unit 11 in a layered manner, digging a groove, leveling, hoisting and placing the bottommost layer guard ring unit 11, paving a layer of geogrid 6 on the bottommost layer guard ring unit, cutting off the inner part of a rectangular middle hole 12 of the geogrid, and inserting bolt steel bars 14 into each vertical jack 13;
(2) filling a layer of filler to the height of the upper layer of geogrid 6, digging a groove and leveling, hoisting one or two retainer units 11 for placing the layer, paving the layer of geogrid 6, cutting off the inner part of rectangular middle holes 12, and inserting bolt reinforcing steel bars 14 into each vertical jack 13 of the installed retainer units 11;
(3) repeating the steps until each guard ring unit 11 in the reinforced roadbed filling body is installed and is installed to the elevation of the waterproof cushion layer;
(4) a waterproof cushion layer is paved, so that the composite geomembrane 4 is pressed between the end surfaces of the two guard ring units 11, and the inner part of the rectangular middle hole 12 is cut off;
(5) installing the retainer unit 11 until the uppermost top surface thereof is exposed to the road surface 22, and inserting the latch bar 14 into each of the vertical insertion holes 13 of the installed retainer unit 11 to form a preformed hole retainer whole;
(6) the foundation bed surface layer 21 is filled.
And (3) when the upright post foundation 20 of the overhead contact system is constructed in the later period, directly placing the upright post foundation into a reinforcement cage for casting concrete.
The foregoing is intended to illustrate only some of the principles of the construction method of the foundation preformed hole construction of the reinforced earth retaining wall subgrade and contact net of the high speed railway, and is not intended to limit the application to the specific structure and application scope shown and described, so that all possible modifications and equivalents thereof that may be utilized are within the scope of the application as claimed.
Claims (5)
1. The construction method of the foundation preformed hole structure of the high-speed railway reinforced earth retaining wall subgrade contact net comprises two side retaining wall panels (1) and a sand pebble inverted filter layer (2) positioned behind the two side retaining wall panels, wherein a reinforced subgrade filling body with geogrids (6) paved in the two side sand pebble inverted filter layers (2) at vertical intervals is arranged between the two side sand pebble inverted filter layers; the reinforcement subgrade filling body is internally embedded with a preformed hole guard ring at the position of the upright post foundation (20) of the contact net, the top surface of the preformed hole guard ring is exposed out of the roadbed (22), and the bottom surface of the preformed hole guard ring extends to the elevation of the upright post foundation (20) of the contact net; the preformed hole guard ring is composed of vertically stacked guard ring units (11), the plane projection of each guard ring unit (11) is a rectangular frame with two transverse side strips and two longitudinal side strips, and the two transverse side strips and the two longitudinal side strips form a rectangular middle hole (12) for pouring concrete of a contact net upright column foundation (20); the geogrid (6) is pressed between the end surfaces of two adjacent guard ring units (11) and is totally or partially cut off the inner part of the rectangular middle hole (12); vertical insertion holes (13) are longitudinally formed in the transverse strake at intervals, and bolt steel bars (14) inserted into the vertical insertion holes (13) penetrate through the guard ring units (11) and the geogrid (6) to enable the guard ring units (11) to form a stable assembly;
the construction method comprises the following steps:
(1) filling the reinforced roadbed filling body to the height of the bottommost retainer unit (11) in a layered manner, digging a groove, leveling, hoisting and placing the bottommost retainer unit (11), paving an upper layer of geogrid (6), cutting off the inner part of a rectangular middle hole (12), and inserting bolt steel bars (14) into each vertical jack (13);
(2) filling a layer of filler to the height of the upper layer of geogrid (6), digging grooves and leveling, hoisting one or two retainer units (11) for placing the layer, paving the layer of geogrid (6), cutting off the inner part of rectangular middle holes (12), and inserting bolt reinforcing steel bars (14) into each vertical jack (13) of the installed retainer units (11);
(3) repeating the steps until each guard ring unit (11) in the reinforced roadbed filling body is installed and is installed to the height of the waterproof cushion layer;
(4) a waterproof cushion layer is paved, so that a composite geomembrane (4) is pressed between the end surfaces of two guard ring units (11), and the inner part of a rectangular middle hole (12) is cut off;
(5) installing the guard ring unit (11) until the top surface of the uppermost guard ring unit is exposed out of the road surface (22), and inserting the bolt reinforcing steel bars (14) into each vertical jack (13) of the installed guard ring unit (11) to form a preformed hole guard ring whole;
(6) filling a foundation bed surface layer (21).
2. The construction method of the foundation preformed hole structure of the reinforced earth retaining wall subgrade contact net of the high-speed railway, as set forth in claim 1, is characterized in that: the height of the guard ring unit (11) is equal to the vertical interval of two adjacent layers of geogrids (6), or equal to 1/2 of the vertical interval of two adjacent layers of geogrids (6).
3. The construction method of the foundation preformed hole structure of the reinforced earth retaining wall subgrade contact net of the high-speed railway, as set forth in claim 1, is characterized in that: two geogrids (6) are longitudinally paved at the rectangular middle hole (12) and are bound and connected into a whole through nylon ropes (15).
4. The construction method of the foundation preformed hole structure of the reinforced earth retaining wall subgrade contact net of the high-speed railway, as set forth in claim 1, is characterized in that: in the rectangular middle hole (12), the geogrid (6) is cut off along the inner walls of the two longitudinal strakes and the inner wall of the transverse strakes at one side far away from the sandy pebble reverse filtering layer (2), a transverse rib is reserved at the transverse strakes at one side close to the sandy pebble reverse filtering layer (2) in the rectangular middle hole (12), and the rest part is cut off.
5. The construction method of the foundation preformed hole structure of the reinforced earth retaining wall subgrade contact net of the high-speed railway, as set forth in claim 1, is characterized in that: a waterproof cushion layer and a foundation bed surface layer (21) are sequentially paved above the top surface of the reinforced roadbed filling body, and the waterproof cushion layer is composed of an upper middle coarse sand layer (3), a composite geomembrane (4) and a lower middle coarse sand layer (5); the composite geomembrane (4) is pressed between the end faces of two adjacent guard ring units (11) and is cut off the inner part of the rectangular middle hole (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810583077.4A CN108914718B (en) | 2018-06-07 | 2018-06-07 | Construction method for foundation preformed hole structure of high-speed railway reinforced earth retaining wall subgrade contact net |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810583077.4A CN108914718B (en) | 2018-06-07 | 2018-06-07 | Construction method for foundation preformed hole structure of high-speed railway reinforced earth retaining wall subgrade contact net |
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| Publication Number | Publication Date |
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| CN108914718A CN108914718A (en) | 2018-11-30 |
| CN108914718B true CN108914718B (en) | 2023-11-17 |
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| CN108914718A (en) | 2018-11-30 |
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