CN209958372U - Railway newly-added second-line platform back way foundation pile pipe curtain supporting structure - Google Patents

Railway newly-added second-line platform back way foundation pile pipe curtain supporting structure Download PDF

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Publication number
CN209958372U
CN209958372U CN201920597912.XU CN201920597912U CN209958372U CN 209958372 U CN209958372 U CN 209958372U CN 201920597912 U CN201920597912 U CN 201920597912U CN 209958372 U CN209958372 U CN 209958372U
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curtain
pile
steel
existing
supporting
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努尔买买提·吐尔逊
张树新
张振钛
庄新玉
江华
韦朝
王振文
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XINJIANG RAILROAD PROSPECTING DESIGN INSTITUTE CO LTD
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XINJIANG RAILROAD PROSPECTING DESIGN INSTITUTE CO LTD
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Abstract

The utility model discloses a railway newly increases second line platform way foundation pile pipe curtain supporting construction behind one kind is with existing abutment behind one's back or abutment behind one's back curb department newly increase a fender pile and existing railway roadbed slope foot department newly increase a fender pile as the strong point, again by the perpendicular excavation supporting system that horizontal steel pipe curtain and fender soil board formed. Consists of an existing abutment, a supporting pile, a horizontal steel pipe curtain, a retaining plate and the like. The structure is safe and convenient, the support is not easy to destabilize and collapse, the operation of the existing line is not influenced, and the normal operation and safety of the existing railway can be ensured. Furthermore, the utility model discloses a supporting construction of foundation ditch is novel, and the material still less on the basis of guaranteeing safety saves the cost, and mechanized efficiency of construction is higher, but furthest's reduction line interval.

Description

Railway newly-added second-line platform back way foundation pile pipe curtain supporting structure
Technical Field
The utility model relates to a road bed is strutted construction technical field, especially indicates a railway newly increases second line platform way foundation pile pipe curtain supporting construction.
Background
With the development of innovation and the adjustment of economic industrial structure, the transportation enterprises have developed unprecedented vitality and various transportation modes develop rapidly. The railway is used as a main artery of national economy, is also the most popular transportation tool, has the characteristics and advantages of high transportation energy, long transportation distance, low cost, less occupied area, all weather, energy conservation, little pollution and the like, and occupies a great position in national economy.
With the increasing amount of goods transported by railways, when the capacity of the existing railways is saturated or is about to be saturated, a new line needs to be added near the existing railways. When a second line is newly added to the existing railway, in order to reduce the floor area of the second line, reduce the amount of filling (digging) and save the investment, the distance between the newly added second line and the existing line is generally controlled within the range of 5-12 m. Because the line spacing is close, the additional second line is under construction in the range of the existing railway roadbed, the existing abutment cone and the abutment back roadbed are damaged when the second line abutment foundation pit is excavated, and the safety of the existing line is affected. In order to ensure the normal operation and safety of the existing railway, the existing railway and the roadbed slope must be effectively protected and reinforced.
At present, the conventional protection scheme during excavation of a newly-added second-line abutment foundation pit comprises the following steps: in the construction range, the existing railway line is protected by erecting 3-5-3 buckling and hanging rail beams, and the second-line abutment is protected by a plurality of bored piles and cast-in-place reinforced concrete walls (pile slab continuous walls for short) by the existing abutment and the side slope of the foundation pit at one side of the roadbed. The gaps between the piles are protected for the second time by cast-in-place reinforced concrete walls (with the thickness of 20 cm), and the toe is protected by woven bag cofferdams.
Disadvantages of conventional protection schemes:
(1) before 3-5-3 buckling and hanging rail beams are erected on an existing railway, seamless track cutting and stress relieving treatment are carried out on the existing railway track, and the seamless track is recovered after the hanging rail beams are dismantled. The cutting (splicing) operation of the seamless line in a large range damages the existing line and cannot restore the original shape.
(2) When 3-5-3 buckling and hanging rail beams are erected on an existing railway, the railway line needs to limit speed and slowly move, so that the existing railway is more tense in energy transportation and generally does not have long-time and frequent speed-limiting construction conditions.
(3) The pile-plate continuous wall is formed by combining a plurality of manual hole digging piles arranged along the periphery of a foundation pit and a cast-in-situ reinforced concrete wall between the hole digging piles. The manual hole digging piles are basically close to the existing railway shoulders, are large in quantity and deep in embedment (meeting underground water frequently), and are difficult to construct during secondary protection pouring while digging the retaining wall between the hole digging piles, the whole construction process is basically completed by manpower, the construction efficiency is low, the safety is poor, and the investment is high. In the actual application process, the normal operation and safety of the existing railway cannot be absolutely ensured, and the construction risk is great.
(4) The space between the existing line and the newly added line is enlarged by arranging the pile plate continuous wall, and the occupied area, the square filling (digging) amount, the investment and the like of the two lines are correspondingly increased.
Disclosure of Invention
The utility model aims at providing a railway increases two line platform way foundation pile pipe curtain supporting construction newly, this structural support is difficult for the unstability and collapses, does not influence existing line operation, can guarantee the normal operation and the safety of existing railway, and excavation supporting structure is novel, and the material still less on the basis of guaranteeing safety saves the cost, and mechanized efficiency of construction is higher, but furthest's reduction line interval.
The purpose of the utility model is realized like this: a railway newly-increased second-line abutment back-way foundation pile pipe curtain supporting structure is characterized in that a supporting pile is arranged at a position, close to a toe of a slope, of one side of an existing railway newly-increased second-line abutment, corresponding to the tail of the existing abutment, and a pile body is formed by adopting a manual hole digging pile, a drilling pile or an assembled retaining structure; the steel tube guiding device is characterized in that a guiding steel tube and a guiding frame are horizontally arranged along the center of the cross section of a supporting pile in the length direction, the diameter of the guiding steel tube is slightly larger than the outer diameter of the steel tube curtain, the guiding frame is composed of 2H-shaped steel frames, the guiding frames are fixed on the two sides of the front part and the rear part of the guiding steel tube in a group two by two mode respectively, the guiding frame is vertical to the guiding steel tube, and the guiding steel tubes are horizontally and uniformly arranged at intervals along; c15 concrete is adopted in the supporting piles to cast the pile body; arranging steel pipe curtain holes in a row from top to bottom in an existing railway roadbed behind an existing abutment by adopting a horizontal drilling machine and following a pipe drilling construction process, wherein the steel pipe curtain holes correspond to the number and the positions of guide steel pipes in support piles, a plurality of curtain steel pipes are respectively inserted into the steel pipe curtain holes, a plurality of holes with the diameter of 10mm are drilled in pipe bodies of the curtain steel pipes, the hole spacing is 500mm, the cross-shaped curtain steel pipes are arranged in a staggered manner, reinforcing cages or section steel are arranged in the curtain steel pipes, and the other ends of the curtain steel pipes respectively penetrate through the guide steel pipes in the support piles to form a pile pipe curtain supporting structure; cement mortar is arranged in the curtain steel pipe.
The utility model discloses a principle and advantage are: (1) during construction of the pile pipe curtain supporting structure, the existing railway line, roadbed, abutment cone and other parts are not affected. (2) 3-5-3 buckling and hanging rail beams are not required to be erected on the existing railway line, and the seamless line is not required to be cut and subjected to stress diffusion treatment. (3) The construction process of the pile or the steel pipe curtain can be basically operated mechanically, the efficiency is high, the construction period is short, the safety is high, and the construction risk is low. (4) The existing abutment can be used as a relay supporting point of the steel pipe curtain, a retaining structure can be omitted, the material consumption of the pile pipe curtain supporting structure is small, and the investment is saved. (5) The operation is carried out in the existing roadbed filling range, and the influence of adverse factors such as unfavorable geology, underground water and the like is basically avoided. (6) Because the protective structure is not needed between the existing line and the newly added line, the line spacing can be reduced to the maximum extent, and the floor area, the square filling (digging) amount, the investment and the like of the two lines are correspondingly reduced. (7) In the actual operation process, the normal operation and safety of the existing railway can be ensured.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a top view of a conventional protective structure provided in the background art of the present invention;
fig. 2 is a side view of a conventional protective structure provided in the background art of the present invention;
fig. 3 is an explanatory view of a supporting structure of the present invention;
FIG. 4 is a front view of the steel tube curtain construction of the present invention;
FIG. 5 is a top view illustrating the construction of a steel tube curtain of the present invention;
FIG. 6 is a vertical view of the steel tube curtain of the present invention;
FIG. 7 is a structural view of a curtain steel pipe of the present invention;
fig. 8 is a cross-sectional view of fig. 7.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
At present, the conventional protection scheme during excavation of a newly-added second-line abutment foundation pit comprises the following steps: in the construction range, the existing railway line is protected by erecting 3-5-3 buckling and hanging rail beams, and the second-line abutment 5-1 is protected by a plurality of bored piles 9 and cast-in-place reinforced concrete walls 10 (pile slab continuous walls for short) by the existing abutment 3 and a foundation pit side slope on one side of the roadbed. The gap between the piles 9 and 9 is protected for the second time by adopting a cast-in-place reinforced concrete wall 10 (with the thickness of 20 cm), and the toe is protected by adopting a woven bag cofferdam. As shown in fig. 1 and 2, a structure of a new line bridge abutment in the prior art is provided. Disadvantages of conventional protection schemes: the pile-plate continuous wall is formed by combining a plurality of manual hole digging piles 9 arranged along the periphery of a foundation pit and a cast-in-situ reinforced concrete wall 10 between the hole digging piles. The manual hole digging piles are basically close to the existing railway shoulders, are large in quantity and deep in embedment (meeting underground water frequently), and are difficult to construct during secondary protection pouring while digging the retaining wall between the hole digging piles, the whole construction process is basically completed by manpower, the construction efficiency is low, the safety is poor, and the investment is high. In the actual application process, the normal operation and safety of the existing railway cannot be absolutely ensured, and the construction risk is great.
And the utility model discloses supporting construction is very different with current protection scheme:
a railway newly-increased two-line abutment back way foundation pile pipe curtain supporting structure is disclosed, as shown in figures 3-8, a supporting pile is arranged at a position, close to a slope toe, of one side of an existing railway 1 newly-increased two-line abutment and corresponding to the tail of an existing abutment 3, a pile body is formed by adopting a manual hole digging pile 6, a drilled pile or an assembly type retaining structure, an excavation pile body adopts a steel retaining wall, a construction method of excavating and installing from top to bottom is adopted, and the depth of each retaining wall is determined according to the situation of soil quality on site;
a guide steel pipe 6-3 and a guide frame 6-2 are arranged in front of the center of the cross section of the bored pile 6 in the length direction, the diameter of the guide steel pipe 6-3 is slightly larger than the outer diameter of a steel pipe 7-1 of the steel pipe curtain, and the guide frame 6-2 is formed by welding 2I-shaped steel frames and the guide steel pipe 6-3; the guide frames 6-2 are fixed on two sides of the guide steel pipes 6-3 in pairs respectively, and the guide steel pipes are horizontally and uniformly arranged at intervals along the height direction of the bored pile 6;
after a guide steel pipe and a guide frame are installed in the bored pile, a pile body is poured by C15 concrete 6-4;
a steel pipe curtain hole is drilled in an existing railway roadbed behind an existing bridge abutment 3 by adopting a horizontal drilling machine following pipe drilling construction process, the steel pipe curtain hole corresponds to the number and the position of guide steel pipes in a bored pile, a plurality of curtain steel pipes 7-1 are respectively inserted into the steel pipe curtain hole, a plurality of holes 7-2 with the diameter of 10mm are drilled on the pipe body of the curtain steel pipes, the hole interval is 500mm, the curtain steel pipes are arranged in a cross-shaped manner, a steel reinforcement cage 7-3 or profile steel is arranged in each curtain steel pipe, and the other ends of the curtain steel pipes respectively penetrate through the guide steel pipes 6-3 in the bored pile to form a pile pipe curtain supporting structure;
grouting 7-4 in a curtain steel pipe 7-1, wherein the proportion of grouting slurry is 1: 1: 1, cement mortar, wherein the volume of a theoretical naked hole is controlled to be 1.5-2.0 times of the grouting amount, the grouting pressure is controlled to be 0.2-0.4 Mpa, grouting is stopped after the theoretical naked hole volume and the grouting pressure are stabilized, grouting speed, grouting amount and grouting effect tests are carried out before grouting, appropriate data are obtained to guide grouting construction, grouting is carried out according to the experimental data during grouting construction, monitoring is strengthened during construction, subgrade or ground surface uplift in a grouting area is strictly forbidden, and the grouting speed and grouting amount are adjusted according to the monitoring result; the slurry cures the curtain steel pipe and the soil around the steel pipe, further improving the rigidity of the pile pipe curtain composed of the curtain steel pipe.
After the pile pipe curtain supporting structure is completed, dismantling a cone 4 of the existing bridge at a newly added second-line abutment position 5, and vertically excavating the existing railway roadbed to the designed elevation of a foundation pit;
when the existing railway roadbed is poor in filling, the vertical excavation surface of the steel pipe curtain can adopt a mode of installing retaining plates 7-5 for supporting while excavating, the retaining plates 7-5 adopt steel plates or bridge construction templates, the retaining plates 7-5 and the steel pipe curtain are welded and formed in a full-welding mode, the construction method that the retaining plates are installed while excavating from top to bottom in the foundation pit manually excavated is adopted, the excavation depth of each section can be determined according to the condition of the soil quality on site, and the condition that the gap of the steel pipe curtain 7 flows sand and the wall of the foundation pit is unstable can be prevented. The retaining plate is made of steel plates or bridge construction templates, and the retaining plate and the steel tube curtain are welded (fully welded) and formed.
The hole digging pile 6 adopts a hole digging pile protective wall 6-1 to dig and support, a section steel guide frame 6-2 and a guide steel pipe 6-3 are arranged in the hole digging pile 6, and then pile body concrete 6-4 is poured.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (1)

1. The utility model provides a railway increases two line platform way foundation pile pipe curtain supporting construction newly, characterized by: a supporting pile is arranged at a position, close to a slope toe, on one side of an existing railway newly-added second-line bridge abutment, corresponding to the tail part of the existing bridge abutment, and a pile body is formed by adopting a manual hole digging pile, a drilling pile or an assembled supporting and retaining structure; the steel tube guiding device is characterized in that a guiding steel tube and a guiding frame are horizontally arranged along the center of the cross section of a supporting pile in the length direction, the diameter of the guiding steel tube is slightly larger than the outer diameter of the steel tube curtain, the guiding frame is composed of 2H-shaped steel frames, the guiding frames are fixed on the two sides of the front part and the rear part of the guiding steel tube in a group two by two mode respectively, the guiding frame is vertical to the guiding steel tube, and the guiding steel tubes are horizontally and uniformly arranged at intervals along; c15 concrete is adopted in the supporting piles to cast the pile body; arranging steel pipe curtain holes in a row from top to bottom in an existing railway roadbed behind an existing abutment by adopting a horizontal drilling machine and following a pipe drilling construction process, wherein the steel pipe curtain holes correspond to the number and the positions of guide steel pipes in support piles, a plurality of curtain steel pipes are respectively inserted into the steel pipe curtain holes, a plurality of holes with the diameter of 10mm are drilled in pipe bodies of the curtain steel pipes, the hole spacing is 500mm, the cross-shaped curtain steel pipes are arranged in a staggered manner, reinforcing cages or section steel are arranged in the curtain steel pipes, and the other ends of the curtain steel pipes respectively penetrate through the guide steel pipes in the support piles to form a pile pipe curtain supporting structure; cement mortar is arranged in the curtain steel pipe.
CN201920597912.XU 2019-04-28 2019-04-28 Railway newly-added second-line platform back way foundation pile pipe curtain supporting structure Active CN209958372U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920597912.XU CN209958372U (en) 2019-04-28 2019-04-28 Railway newly-added second-line platform back way foundation pile pipe curtain supporting structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920597912.XU CN209958372U (en) 2019-04-28 2019-04-28 Railway newly-added second-line platform back way foundation pile pipe curtain supporting structure

Publications (1)

Publication Number Publication Date
CN209958372U true CN209958372U (en) 2020-01-17

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ID=69243973

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN209958372U (en)

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