CN109518544B - Method for laying subway prefabricated track slab track bed - Google Patents
Method for laying subway prefabricated track slab track bed Download PDFInfo
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- CN109518544B CN109518544B CN201811637431.3A CN201811637431A CN109518544B CN 109518544 B CN109518544 B CN 109518544B CN 201811637431 A CN201811637431 A CN 201811637431A CN 109518544 B CN109518544 B CN 109518544B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
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Abstract
The invention discloses a construction method for paving a track bed of a prefabricated track slab of a subway underground line, which comprises the following two parts of 'forward-doing' construction of a base and 'reverse-paving' construction of the track slab, and specifically comprises the following steps: after the construction of the track-laying base is finished, firstly, carrying out foundation 'forward laying' construction in the forward direction (from near to far from a feed opening), after pouring foundation concrete construction is finished and the foundation concrete reaches the strength, successively laying a temporary engineering train running line on the foundation surface, after 1-2 interval foundation constructions are finished, carrying out track materials such as track plates, reinforcing steel bars, turnover materials, self-compacting concrete and the like for construction through the temporary line, successively and sectionally removing the temporary line according to the laying construction progress of the track plates on duty, and then carrying out 'reverse laying' of the track plates and self-compacting concrete pouring construction in a 'from far to near' mode. The invention overcomes the influence of equal strength of the self-compacting concrete after pouring on the whole construction progress, and the laying construction of the prefabricated track slab is continuous.
Description
Technical Field
The invention relates to a construction method of a track bed of a prefabricated track slab of an underground subway.
Background
The design of Shanghai city subway No. 9 adopts novel prefabricated track slab track bed structure, refers for and absorbs the ripe prefabricated track slab track bed form of high-speed railway. The track bed structural design is that a self-compacting concrete adjusting layer is arranged between a base layer and a prefabricated track slab, and after the strength of self-compacting concrete poured needs 6-7 days (reaching the design strength of 80%), the track bed can reach the load-bearing boarding condition. The subway underground line tunnel is single-hole single-line structure, if according to normal flow process forward construction, start from laying the starting point promptly, carries out the pouring construction of road bed base earlier, treats that the basement concrete strength reaches the designing requirement after, and the forward carries out track board and lays and self-compaction concrete pouring construction again, receives under the track board self-compaction concrete strength influence, can't lay the track and through construction materials such as track transportation track board and self-compaction concrete. The track slab can only be lifted by a subway track laying vehicle, the furthest transport distance reaches about 500m, the construction efficiency is seriously influenced due to the fact that the subway track laying vehicle is low in running speed, the using amount of turnover materials is large and uneconomic, and the comprehensive laying progress index of the track slab track bed is only 10m/d after early-stage tests.
Disclosure of Invention
The invention provides a method for reversely paving a track slab by adopting a base as the track slab, aiming at the problems that the continuous construction and the construction efficiency of a prefabricated track slab track bed are influenced by longer self-compacting concrete solidification waiting time in the laying construction of the prefabricated track slab track bed of a subway underground line.
The technical scheme of the invention is as follows:
a laying method of a track bed of a subway prefabricated track slab is characterized by comprising the following steps:
sequentially laying: constructing the substrate forward along the construction direction for a certain distance;
a reverse paving step: laying construction of the track slab is carried out from the base completion position to the base construction starting direction;
and repeating the forward paving step and the reverse paving step.
Supreme including is followed down to the whole roadbed structure of subway underground line prefabricated track board: reinforced concrete basement, isolation layer, spacing recess, self-compaction concrete filling layer, prefabricated track board, rail and knot accessory.
The sequential paving step comprises: the method comprises the following steps: construction preparation, tunnel base cleaning, CP III control network building, measuring and setting, and installing a subway track laying vehicle walking rail; step two: pouring a reinforced concrete substrate; step three: and laying a temporary track line on the ground surface. And in the third step, removing the track-laying vehicle running rails and the templates of the sections with the finished foundation construction, and transferring the removed temporary subway track-laying vehicle running rails, templates and the like to the advancing direction of the foundation construction.
The reverse paving step comprises: step a: installing a walking rail of a track laying vehicle, and dismantling a temporary line of a laying plate section; step b: laying out the position of the track slab, and laying and installing the isolation layer, the limiting groove and the reinforcing mesh; step c: transporting, laying and finely adjusting the prefabricated track slab; step d: installing a self-compacting concrete filling layer template and a prefabricated track slab fixing device; step e: filling the self-compacting concrete filling layer, and installing the steel rail and the fastener.
When the sequential paving step is executed, the base construction is carried out for a complete operation shift cycle, and the complete operation shift cycle comprises 4 operation sections including a maintenance area 1, a maintenance area 2, a construction area 1 and a construction area 2.
When the reverse paving step is executed, a complete operation shift cycle comprises a construction area 3 and a construction area 4, wherein the construction area 3 is a section where track slab paving and self-compacting concrete pouring are currently carried out, and the construction area 4 is a section where track slab paving and self-compacting concrete pouring are completed.
In step a, the temporary subway rail laying vehicle running rails and the templates for dismantling the construction area 4 are installed in the construction area 3.
The invention has the beneficial effects that:
the method is used for laying the precast slab track bed, the influence of long equal-strength time on the continuous construction of the track slab after the self-compacting concrete pouring construction is completed in the limited space of the subway underground line single-hole single-line tunnel can be solved, the continuous flow operation can be formed in the construction, the comprehensive laying progress index of the precast track slab track bed is improved to 45m/d from 10m/d of the forward laying, and the laying construction period of the precast track slab track bed is greatly shortened.
Description of the drawings:
fig. 1 shows a structure of a track bed of a prefabricated track slab of an underground line.
Fig. 2 is a schematic diagram of a construction sequence of 'inverted paving' of the track bed of the prefabricated track slab.
FIG. 3 is a distribution diagram of 1 operation cycle construction section of the base 'forward paving' construction.
Fig. 4 is a distribution diagram of 1 operation cycle construction section in the prefabricated track slab 'inverted paving' construction.
Detailed Description
The following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings.
Example 1: example (b): the construction method is implemented by constructing and organizing the whole track bed of the prefabricated track slab on the No. 9 subway line in Shanghai city, and the whole track bed of the prefabricated track slab is completed by 22.02 km. Supreme including is followed down to the whole roadbed structure of subway underground line prefabricated track board: the method comprises the following steps of firstly, forming a reinforced concrete substrate, secondly, forming an isolation layer, fifthly, forming a limiting groove, thirdly, forming a self-compacting concrete filling layer, fourthly, prefabricating a track plate, and sixthly, forming steel rails and fastening parts; the paving method comprises the following steps:
the construction of the substrate is carried out in sequence:
the method comprises the following steps: and (3) preparing before constructing a substrate (namely backfilling an inverted arch of the tunnel), namely measuring and setting a CP III control point, cleaning the substrate, measuring and lofting, and installing a track laying vehicle running rail.
Step two: and (4) performing base construction, including binding base reinforcing steel bars, installing templates, completing concrete pouring, removing the templates, cleaning, finishing and maintaining. The foundation is constructed in the forward direction, namely 1-2 sections of foundation construction from the track laying foundation or a feed opening from near to far are constructed in the forward laying mode, and a complete operation shift cycle of the foundation construction comprises 4 operation sections including a maintenance section 1, a maintenance section 2, a construction section 1 and a construction section 2.
Step three: after the foundation construction is finished and the strength is achieved, a temporary track line is arranged on the surface of the foundation for transporting the concrete materials by the track roof conveying flat car. And simultaneously, removing the track-laying vehicle running rails and templates of the sections with the finished foundation construction, and transferring the removed temporary subway track-laying vehicle running rails and templates and the like to the advancing direction of the foundation construction.
And after the base is finished, laying the track slab from the interval base finishing position to the base construction starting direction. The track slab is laid by adopting a 'reverse laying method', namely after 1-2 intervals of foundation construction are finished, the track slab is laid reversely and self-compacting concrete pouring construction is carried out in a mode of from far to near from a track laying base or a feed opening relative to a foundation.
The reverse paving step comprises: the method comprises the following steps: installing a walking rail of a track laying vehicle, and dismantling a temporary line of a laying plate section; step two: laying and installing the track slab position layout → the isolation layer II, the limiting groove III and the reinforcing mesh; step three: transporting, laying and fine adjusting the prefabricated track slab; step four: mounting a self-compacting concrete filling layer, mounting a template and a prefabricated track slab, and fixing the device; step five: pouring the self-compacting concrete filling layer → installing the steel rail and the fastening fittings; step six: and (5) subsequent construction procedures.
The on-site track slab laying and self-compacting concrete pouring complete operation shift cycle comprises 2 operation sections including 'track slab laying and self-compacting concrete pouring sections, on-shift track slab laying and self-compacting concrete pouring sections', wherein the length of each operation section is 90 meters, the track slab in the construction section is not loaded after the self-compacting concrete pouring is finished, the early stress of the self-compacting concrete is avoided, and the construction is continuous.
The track slab is laid according to the following items:
firstly, removing a temporary track line in a temporary construction area 3, installing a track slab completion area in a construction area 4, installing a track laying vehicle traveling track, and lofting the position of the track slab;
secondly, laying an isolation layer and an elastic cushion layer, and installing a steel bar net sheet;
thirdly, conveying the finished track slab to a construction operation surface, and carrying out lifting, laying and preliminary positioning operation on the track slab by using a track laying vehicle;
fourthly, fine adjustment of the track slab, installation of a template and a fixing device, and fine adjustment of the geometric position of the track slab by utilizing a track foundation control network, a matched measuring system and tooling equipment;
fifthly, self-compacting concrete is poured. The self-compacting concrete in the hole is transported by 9m by adopting a rail car3The concrete tank is introduced into the home-made 2.5m tank after arrival3And the small tank is hoisted by the track laying vehicle to finish the on-site self-compacting concrete pouring construction.
Claims (4)
1. A laying method of a track bed of a subway prefabricated track slab is characterized by comprising the following steps:
sequentially laying: constructing a foundation forward along a construction direction for a certain distance, and constructing a complete operation shift cycle comprising 4 operation sections including a maintenance area 1, a maintenance area 2, a construction area 1 and a construction area 2 on the foundation when the forward paving step is executed;
a reverse paving step: laying construction of the track slab is carried out from the base completion position to the base construction starting direction; when the reverse paving step is executed, a complete operation shift cycle comprises a construction area 3 and a construction area 4, wherein the construction area 3 is a section for currently paving the track slab and pouring the self-compacting concrete, and the construction area 4 is a section for finishing paving the track slab and pouring the self-compacting concrete; the reverse paving step comprises: step a: installing a walking rail of a track laying vehicle, and removing a temporary rail line of a plate section to be laid; step b: laying out the position of the track slab, and laying and installing the isolation layer, the limiting groove and the reinforcing mesh; step c: transporting, laying and finely adjusting the prefabricated track slab; step d: installing a self-compacting concrete filling layer template and a prefabricated track slab fixing device; step e: pouring a self-compacting concrete filling layer, and installing steel rails and fastener fittings; in the step a, a temporary track line of the temporary construction area 3 is dismantled and is installed in a construction area 4 track slab completion area; the lengths of the construction area 3 and the construction area 4 are respectively 90 meters, and the forward paving step and the reverse paving step are repeated.
2. The subway precast track slab track bed laying method according to claim 1, characterized by comprising: supreme including is followed down to the whole roadbed structure of subway underground line prefabricated track board: reinforced concrete basement, isolation layer, spacing recess, self-compaction concrete filling layer, prefabricated track board, rail and knot accessory.
3. The method for laying the subway precast track slab track bed according to claim 2, wherein the sequentially laying step comprises: the method comprises the following steps: construction preparation, tunnel base cleaning, CPIII control network building, measuring and setting, and installing a subway track laying vehicle running rail; step two: pouring a reinforced concrete substrate; step three: and laying a temporary track line on the ground surface.
4. The subway precast track slab track bed laying method according to claim 3, wherein: and in the third step, removing the track-laying vehicle running rails and the templates of the sections with the finished foundation construction, and transferring the removed temporary subway track-laying vehicle running rails and the templates to the advancing direction of the foundation construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811637431.3A CN109518544B (en) | 2018-12-29 | 2018-12-29 | Method for laying subway prefabricated track slab track bed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811637431.3A CN109518544B (en) | 2018-12-29 | 2018-12-29 | Method for laying subway prefabricated track slab track bed |
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| Publication Number | Publication Date |
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| CN109518544A CN109518544A (en) | 2019-03-26 |
| CN109518544B true CN109518544B (en) | 2022-04-08 |
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| CN201811637431.3A Active CN109518544B (en) | 2018-12-29 | 2018-12-29 | Method for laying subway prefabricated track slab track bed |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111851154A (en) * | 2020-06-30 | 2020-10-30 | 中国电建市政建设集团有限公司 | Base pre-construction method based on cast-in-situ combined type damping cushion ballast bed |
| CN112239969A (en) * | 2020-08-24 | 2021-01-19 | 中铁工程设计咨询集团有限公司 | Prefabricated assembled damping track system |
| CN112962366A (en) * | 2021-03-04 | 2021-06-15 | 中铁二局集团有限公司 | Reverse paving construction method for CRTS III type track slab in mountainous area |
| CN115595836B (en) * | 2022-11-08 | 2024-04-30 | 中铁五局集团第六工程有限责任公司 | Construction method for sub-section process of underground iron prefabricated track slab track bed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10009506B4 (en) * | 2000-02-29 | 2008-06-19 | Rail.One Gmbh | Concrete-free threshold |
| CN104480802A (en) * | 2014-11-20 | 2015-04-01 | 中铁八局集团有限公司 | Construction method of CRTS III plate type ballastless track |
| CN106758555B (en) * | 2017-01-13 | 2018-06-12 | 中铁工程机械研究设计院有限公司 | Subway integrated sleeper bed construction method |
| CN107178010A (en) * | 2017-07-06 | 2017-09-19 | 中铁上海工程局集团有限公司 | A kind of city track traffic engineering assembled track laying device and method |
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