CN114934413B - Group ground steel rail construction method - Google Patents
Group ground steel rail construction method Download PDFInfo
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- CN114934413B CN114934413B CN202210784768.7A CN202210784768A CN114934413B CN 114934413 B CN114934413 B CN 114934413B CN 202210784768 A CN202210784768 A CN 202210784768A CN 114934413 B CN114934413 B CN 114934413B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 235
- 239000010959 steel Substances 0.000 title claims abstract description 235
- 238000010276 construction Methods 0.000 title claims abstract description 28
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- 238000013461 design Methods 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 25
- 238000005266 casting Methods 0.000 claims description 12
- 239000002023 wood Substances 0.000 claims description 7
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- 239000004576 sand Substances 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
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- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 23
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- 238000005516 engineering process Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
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- 230000004048 modification Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 235000003283 Pachira macrocarpa Nutrition 0.000 description 1
- 241001083492 Trapa Species 0.000 description 1
- 235000014364 Trapa natans Nutrition 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
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Classifications
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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
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
- E01B29/16—Transporting, laying, removing, or replacing rails; Moving rails placed on sleepers in the track
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Foundations (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The embodiment of the application provides a group ground steel rail construction method, and belongs to the technical field of steel rail construction. The group ground steel rail construction method comprises the following steps that anchor bolt preformed holes are formed, embedded parts are buried at design positions of the anchor bolts before concrete is poured, the embedded parts are taken out after initial setting and before final setting of the concrete, the preformed holes of the anchor bolts are formed on a foundation, steel rails are rough and flat, the anchor bolts and adjusting jackscrews are installed at least two ends of a bottom plate of the steel rails before the steel rails are placed on the foundation, then the steel rails are placed on the foundation, and the anchor bolts are inserted into the preformed holes; pouring grouting material into the reserved holes, measuring and adjusting the plane position, elevation and levelness of each group of steel rails to meet the requirements, screwing up nuts of all foundation bolts on each group of steel rails, pouring plain concrete around the steel rails, and further reinforcing the steel rails to limit the displacement of the steel rails, wherein the steel rails and the concrete form a whole. The construction method of the group ground steel rail can improve the installation accuracy of the steel rail.
Description
Technical Field
The application relates to the technical field of steel rail construction, in particular to a group ground steel rail construction method.
Background
At present, the ground rail installation mainly has two major categories, and first is the high-speed rail installation, along with the speed-up of train, proposes the requirement higher to the precision of track installation, and at present domestic common ballastless track construction technique takes CRTS II plate ballastless track as the example, mainly comprises rail, supporting fastener, prefabricated track board, mortar adjustment layer, continuous bed plate, sliding layer and side direction dog, guarantees through adjustment supporting backing stone Gao Chenglai that the double track roof is located the coplanar during the construction. The second is that the portal crane walking rail of the wharf is installed, the elevation of the steel backing plate is controlled through foundation bolts, then the rail is installed on the upper part of the steel backing plate through a pressing plate, and thermite welding is carried out between the rails to realize seamless installation of the rails. The high-speed rail installation prefabrication degree and the manufacturing cost are high, and the method is not suitable for the rail installation construction with small engineering quantity; in the portal crane steel rail installation technology, the damping effect is considered, the steel backing plate needs to be installed first, the flatness requirement on the installation of the steel backing plate is higher (less than 1mm/1000 mm), and the portal crane steel rail installation technology is high in cost and high in installation difficulty.
Disclosure of Invention
The embodiment of the application provides a group ground steel rail construction method which can improve the installation accuracy of steel rails.
The embodiment of the application provides a group ground steel rail construction method, which comprises the following steps of: s1, anchor bolt preformed holes; measuring and lofting positions, corresponding to the foundation bolts on the steel rails, on the foundation cushion layer, arranging a reinforcement engineering and a template engineering, burying an embedded part at the designed positions of the foundation bolts before concrete pouring, pouring foundation concrete, taking out the embedded part before final setting after initial setting of the concrete, and forming preformed holes of the foundation bolts on the foundation, wherein the inner diameters of the preformed holes are larger than the outer diameters of the foundation bolts; s2, rough leveling of the steel rail; paying off the positions of the steel rails according to a plane layout diagram of the steel rails, sequentially hoisting each group of steel rails on a foundation, installing foundation bolts and adjusting jackscrews at least two ends of a bottom plate of the steel rails before the steel rails are placed on the foundation, penetrating the foundation bolts on the steel rails, adjusting the jackscrews to be in threaded fit with the steel rails, placing the steel rails on the foundation, inserting the foundation bolts into the reserved holes, adjusting the plane positions of the steel rails under the control and monitoring of a measuring instrument, and rotating the adjusting jackscrews to adjust the elevation and levelness of the steel rails so as to enable the steel rails to be rough and flat; s3, grouting a reserved hole; after the rough leveling of the steel rail is finished, the anchor bolts are in a vertical state, nuts on the anchor bolts are adjusted, the nuts are positioned above a bottom plate of the steel rail, and grouting materials are poured into the reserved holes; s4, flattening and fixing the steel rail; after the intensity of grouting material in the reserved holes reaches the design requirement, measuring and adjusting the plane position, elevation and levelness of each group of steel rails to meet the requirement, screwing nuts of all anchor bolts on each group of steel rails, and finishing the fixation of the steel rails; s5, reinforcing the steel rail; and after the steel rail is installed and accepted, plain concrete is poured around the steel rail, and the steel rail is further reinforced so as to limit the displacement of the steel rail, and the steel rail and the concrete form a whole.
In the scheme, the embedded method of the anchor bolt preformed hole is adopted, the embedded part is embedded in the foundation according to the design position and depth of the anchor bolt while the foundation is supported, after the concrete is initially set, the embedded part is taken out to form the preformed hole on the foundation, the steel rail is placed at the appointed position of the foundation, the preformed hole can be used for inserting and installing the anchor bolt on the steel rail, then fine stone concrete or non-shrinkage fine stone concrete is used for secondary pouring into the preformed hole to fix the anchor bolt, the precision requirement of the method on the preformed hole is low (20 mm), the construction process is simple, the advantages that the anchor bolt support needs to be embedded in the traditional technology are saved, and the like are achieved. The anchor bolts and the adjusting jackscrews are arranged on the steel rail, when the elevation and the levelness of the steel rail are adjusted, the mode that the adjusting jackscrews and the fixing nuts act simultaneously is adopted, so that the precision and the leveling difficulty of the steel rail are reduced, the elevation and the levelness of the steel rail are adjusted by arranging the adjusting jackscrews at the end of the steel rail, the anchor bolts and the nuts are matched for locking and fixing, the leveling of the heavy steel rail is facilitated, and the construction difficulty is reduced; the steel rail is further fixed by adopting plain concrete filling around the steel rail, and the integrity of the group steel rail is enhanced.
In some embodiments, in the step S1, the embedded part adopts a wood box or a PVC pipe, a release agent is coated on the outer circumferential surface of the embedded part, and the bottom plate steel bar in the foundation is spot-welded at the position corresponding to the embedded part to form a hoop so as to stabilize the embedded part.
In the above technical scheme, the embedded part can adopt a wood box or a PVC pipe, and is determined according to actual conditions, for example, when the preformed hole is a square hole, the embedded part can be embedded by adopting a wood box plug body, and when the preformed hole is a circular hole, the embedded part can be embedded by adopting the PVC pipe. The hoops are formed at the positions of the bottom plate steel bars in the foundation, which correspond to the embedded parts, in a spot welding mode, and can position or fix the embedded parts, so that the positions of the embedded parts are prevented from being influenced when the concrete of the foundation is poured, and the embedded precision of the embedded parts is ensured.
In some embodiments, in the step S1, when the concrete of the foundation is poured, the periphery of the embedded part is symmetrically and uniformly blanked so as to prevent the vibrating rod from touching the embedded part, and after the embedded part is taken out to form the preformed hole, the hole opening of the preformed hole is covered so as to prevent sundries from falling into the preformed hole.
According to the technical scheme, the vibrating rod can be prevented from touching the embedded part by symmetrically and uniformly blanking the periphery of the embedded part, so that the embedded part is ensured to be fixed in the embedded position, the hole opening is covered after the preformed hole is formed, foreign matters can be prevented from falling into the hole opening, and the follow-up grouting procedure of the preformed hole is ensured.
In some embodiments, in step S2, a spacer is placed on the foundation at a position corresponding to the adjustment screw before the rail is placed on the foundation, the spacer being used to carry the lower end of the adjustment screw to prevent intrusion into the foundation when the adjustment screw is rotated.
In the above technical scheme, because the upper surface of basis is the concrete protection layer, and hardness is weaker in comparison with the adjustment jackscrew, consequently through placing the gasket on the basis, the gasket can play and bear the weight of the adjustment jackscrew, shares the stress when adjusting the jackscrew rotation, can prevent effectively that the adjustment jackscrew from boring into raft foundation in, ensures the adjustment effect of adjustment jackscrew to the elevation and the levelness of rail. And moreover, the defect that the adjustment length of the positioning nut is insufficient in the traditional technology can be effectively overcome by placing gaskets with different thicknesses at the lower part of the adjustment jackscrew, and the accuracy of steel rail installation is improved.
In some embodiments, in step S2, the rail is suspended until the anchor bolts are close to the preformed holes, the rail stops descending, and the anchor bolts are checked and adjusted to align with the preformed holes to ensure that the anchor bolts enter the preformed holes and to allow the adjusting jackscrews to be centered in the shims.
In the technical scheme, before the steel rail is lowered onto the foundation, the position relation between the anchor bolts and the reserved holes and the position relation between the anchor bolts and the gasket of the adjusting jackscrews are further checked, the anchor bolts are ensured to be positioned at the centers of the reserved holes, and the adjusting jackscrews are positioned at the centers of the gaskets, so that the installation accuracy of the steel rail is improved.
In some embodiments, in step S2, after the steel rail is in place, it is observed whether the position of the anchor bolt is located at the center of the preformed hole, if the position of the anchor bolt is not satisfactory, the position of the steel rail is adjusted by using a crow bar, so that the position of the steel rail satisfies the rough flatness accuracy requirement, and the laser five-wire gauge is used to control each group of steel rails on a straight line.
In the technical scheme, after the steel rail is in place, the position of the foundation bolt is rechecked again, if the requirements are not met, the position of the steel rail can be adjusted by using a crowbar until the position of the steel rail meets the requirements.
In some embodiments, in step S3, before pouring grouting material into the preformed hole, dust and exfoliated sand in the preformed hole are cleaned, the inner wall of the preformed hole is wetted, the anchor bolts are protected, and vibrating is performed in the pouring process of pouring grouting material in the preformed hole, so that the pouring compactness is ensured.
According to the technical scheme, before pouring grouting material, the preformed hole is cleaned, and the inner wall of the preformed hole is subjected to wetting treatment, so that the combination performance of the grouting material and the inner wall of the preformed hole can be increased, and the fixing effect of the foundation bolt in the preformed hole is improved.
In some embodiments, in step S4, after the grouting material strength in the hole to be reserved reaches the design requirement, when at least one of the plane position, elevation and levelness of the steel rail does not meet the requirement, the nuts on all the anchor bolts are loosened, the deviation of the plane position of the steel rail is adjusted by using a crow bar, the deviation of the levelness and elevation of the steel rail is adjusted by adjusting a jackscrew until the plane position, elevation and levelness of the steel rail meet the requirement, after the steel rail is precisely flattened in place, the nuts of the anchor bolts are screwed to fix the steel rail, and after the nuts are fixed, the plane position, elevation and levelness of the steel rail are rechecked again.
In some embodiments, in step S4, the threads are adjusted in rotation, one by one, from one end of the rail to the other, as the whole of the same set of rails is adjusted in fine-leveling.
In some embodiments, in step S5, the T-shaped channel of the rail is covered with a thin film prior to casting the concrete, and the concrete is filled to a position 10mm below the top surface of the rail while plain concrete is being cast.
According to the technical scheme, the T-shaped groove of the steel rail is covered with the film, so that concrete can be prevented from flowing into the T-shaped groove of the steel rail, and the subsequent normal use of the steel rail is ensured. When plain concrete is poured, the concrete is filled to a position 10mm below the top surface of the steel rail, so that the steel rail is not easy to move, and the stability of the steel rail is ensured.
Additional features and advantages of the application will be set forth in the detailed description which follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic plan view of a method of constructing a group of ground rails according to some embodiments of the present application;
Fig. 2 is a schematic structural diagram of cooperation between an embedded part (wooden box) and a hoop in a group ground steel rail construction method according to some embodiments of the present application;
FIG. 3 is a schematic view of a structure of an embedded part (PVC pipe) and a hoop in cooperation in a group ground steel rail construction method according to some embodiments of the present application;
FIG. 4 is a cross-sectional view of a rail and foundation in a method of constructing a group of ground rails provided in some embodiments of the present application;
FIG. 5 is a cross-sectional view of a group ground rail construction method according to some embodiments of the present application after the rails are secured;
Fig. 6 is a schematic structural diagram of a steel rail and foundation matching in a method for constructing a group of ground steel rails according to some embodiments of the present application.
Icon: 10-foundation; 11-hoops; 12-embedding parts; 13-preformed holes; 20-rail; a 21-T-shaped slot; 22-a bottom plate; 30-anchor bolts; 31-a nut; 40-adjusting the jackscrews; 41-a gasket; 50-grouting material; 60-plain concrete.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is conventionally put when the application product is used, which is merely for convenience in describing the present application and simplifying the description, and is not indicative or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Examples
The inventor finds that the foundation bolts are pre-buried in the traditional steel rail construction method, positioning nuts are arranged on the foundation bolts (lower parts of the steel rails), the purpose of controlling the elevation of the steel rails is achieved by adjusting the heights of the positioning nuts, the group foundation bolts are pre-buried and are required to be fixed by adopting brackets, the foundation bolts are easy to deviate when concrete of a raft foundation is poured, the reworking treatment difficulty is high after quality problems occur, and the cost is high; and for single rail weight is big, and the interval of two rows of rails is less, for example only 24cm between two rails, and operating space is narrow and small, adopts the locating nut in the conventional art to adjust the elevation, and the degree of difficulty is great.
In view of the above, the embodiment of the application provides a group ground steel rail construction method which can be widely applied to the installation of ground rails in various industrial and civil buildings, has the advantages of simple construction method, high installation precision, low cost and the like, and can be popularized and applied. The core scheme adopts a grouting method after anchor bolts are reserved in holes, so that the embedding precision of the anchor bolts is improved; the steel rail elevation and levelness are adjusted by arranging the adjusting jackscrews at the end heads of the steel rails, and the steel rails are locked and fixed by matching with the anchor bolts and nuts, so that the leveling of the heavy steel rails is facilitated, and the construction difficulty is reduced; the steel rail is further fixed by adopting plain concrete filling around the steel rail, and the integrity of the group steel rail is enhanced.
Specifically, referring to fig. 1 to 6, the method for constructing the group of ground rails 20 includes the following steps:
S1, anchor bolt preformed holes 13; in the embodiment, the foundation is a raft foundation, the thickness of the raft foundation 10 is 900mm, double-layer bidirectional steel bars of C20150 are internally arranged, and reserved holes 13 are formed in the position of foundation bolts 30 before concrete of the raft foundation 10 is poured; specifically, the position of the anchor bolt 30 is lofted on the foundation mat layer, the boundary line of the reserved hole 13 is popped up with the lofting point as the center, the anchor bolt 30 adopts the specification of M27 x 800mm, the depth of the reserved hole 13 is 840mm as shown in the table, the depth of the reserved hole 13 for this construction is 900mm, when the reserved hole 13 is a square hole as shown in fig. 2, the size is 140 x 140mm, when the reserved hole 13 is a round hole as shown in fig. 2, the diameter is 200mm, and the distance between the edge of the reserved hole 13 and the raft foundation 10 or the distance between two adjacent reserved holes 13 is greater than 100mm. The reserved square holes are formed by splicing a wood box plug body and a 15mm thick wood template, the lower part of the reserved square holes is plugged, a contact surface between the reserved square holes and concrete needs to be coated with a release agent, the specification model of the bottom plate 22 steel bars of the raft foundation is C20150, the reserved square holes are arranged in a double-layer bidirectional mode, the overall rigidity of the reserved square holes is high, the requirement of fixing the template of the reserved holes 13 is met, and the upper part and the lower part of the reserved square holes are fixed by adopting the bottom plate 22 steel bars to form a hoop 11 through spot welding. Slightly pulling after the initial setting of the concrete pouring, and pulling out the embedded part 12 by means of a form removing tool before the concrete is completely hardened (generally for 6-8 hours); the reserved round hole adopts a De200PVC pipe, the lower part and the pipe body are wrapped by plastic films, the drawing is convenient, and the fixing method is the same as that of the wood plug body. When the template of the preformed hole 13 is installed and fixed, the plane position of the template is strictly controlled according to the coincidence of boundary lines marked by the cushion layer, and the deviation is not more than 20mm.
It should be noted that, when pouring the concrete of raft foundation 10, should evenly feed around built-in fitting 12 symmetrically, prevent that the vibrating rod from touching built-in fitting 12, the time of pulling out built-in fitting 12 should be accurately mastered after pouring, prevent to destroy pore wall concrete or be difficult to pull out after final setting, after built-in fitting 12 pulls out, should cover the hole protection, prevent debris from falling into. Each group of the project is provided with 2 steel rails 20, the interval is 240mm, square holes can be adopted for ensuring that the distance between the reserved holes 13 is more than 100mm, and the interval is just 100mm; considering that part of the steel rail 20 is closely adjacent to a drainage ditch, a cable pit and the like, square holes are adopted in order to ensure that the distance between the edge of the reserved hole 13 and the edge of the foundation is more than 100 mm.
S2, rough and flat steel rail 20; according to the plan of the steel rail 20, using a total station to measure and discharge a transverse and longitudinal control line, leading out the boundary line of the steel rail 20 from the control line, ejecting the boundary line of the steel rail 20 at the top of the raft foundation 10, adopting a factory building crane to perform preliminary positioning of the steel rail 20, referring to fig. 4, 5 and 6, before the steel rail 20 is placed, installing foundation bolts 30 and adjusting jackscrews 40 on a bottom plate 22 of the steel rail 20, wherein the screw threads of the adjusting jackscrews 40 are basically the same, and placing gaskets 41 on the top surface of the raft foundation 10 in advance according to the approximate position of the adjusting jackscrews 40; when the steel rail 20 is lifted and lowered to the position, close to the opening of the reserved hole 13, of the foundation bolt 30, the steel rail 20 stops descending, whether the foundation bolt 30 is centered with the reserved hole 13 or not is checked, the foundation bolt 30 can smoothly enter the reserved hole 13, and the adjusting jackscrew 40 falls on the center position of the gasket 41; after the steel rail 20 is in place, whether the position of the steel rail 20 is positioned at the center of the reserved hole 13 is observed through the bolt hole of the bottom plate 22 of the steel rail 20, the mass of the steel rail 20 is large, the position of the steel rail 20 can be adjusted by using a crow bar, so that the plane position of the steel rail 20 meets the requirement of rough flatness precision (+ -5 mm), each group of steel rails 20 is controlled on a straight line by using a laser five-line instrument, and the distance between each group of steel rails 20 is accurate; after the plane position of the steel rail 20 is determined, the adjusting jackscrew 40 at one end of the steel rail 20 is adjusted, then the adjusting jackscrew 40 at the other end of the steel rail 20 is adjusted, the elevation is controlled by using a level gauge, and the flatness is controlled by using a leveling ruler, so that the whole steel rail 20 is in a horizontal position and does not incline.
S3, grouting a reserved hole 13; after the rough leveling of the steel rail 20 is finished, checking whether the anchor bolt 30 is in a vertical state, and adjusting the nut 31 on the anchor bolt 30 to enable 5-8 threads to be exposed at the upper part of the nut 31; the compressed air is adopted to clean dust and peeled sand in the preformed hole 13, the inner wall of the preformed hole 13 is subjected to wetting treatment, the foundation bolt 30 comprises a plastic film for protecting a finished product, the C50 shrinkage-free grouting material 50 is poured in the preformed hole 13, vibration is carried out in the pouring process, and the pouring compactness is guaranteed.
S4, flattening and fixing the steel rail 20; measuring the plane position, elevation and levelness of the steel rail 20 after the strength of the grouting material 50 in the reserved hole 13 meets the design requirement, and immediately screwing the nuts 31 of the anchor bolts 30 on the steel rail 20 if the strength meets the requirement; if the requirements are not met, the nuts 31 of all the anchor bolts 30 are loosened, the deviation of the plane position of the steel rail 20 is adjusted by using a crowbar, and the levelness and elevation of the steel rail 20 are adjusted by adjusting the jackscrews 40. Because the ground rail is formed by splicing a plurality of monorails, the levelness among the steel rails 20 is not lower than +/-2 mm during fine leveling adjustment, the whole fine leveling adjustment sequence of the steel rails 20 is one by one from one end to the other end of the length direction of the steel rails 20, and error accumulation is avoided. After the steel rail 20 is precisely leveled in place, nuts 31 on the foundation bolts 30 are screwed down for fixing, and after fixing, the plane position, elevation and levelness of the steel rail are checked.
S5, reinforcing the steel rail 20; after the steel rail 20 is installed and accepted, covering the steel rail 20TT type groove 21 with a film to prevent concrete from flowing into the TT type groove 21; c20 plain concrete 60 is poured around the steel rail 20, and 10mm below the top surface of the steel rail 20 is poured for ground decoration construction; the concrete pouring process tightly prohibits the vibrating rod and the discharging pipe from touching the steel rail 20, and the shovel is used for feeding in a part of narrow space, so that the steel rail 20 is prevented from shifting. After the concrete pouring is completed, the displacement of the steel rails 20 is further limited, and each group of steel rails 20 and the concrete form a whole.
Therefore, the method is adopted, the embedded part 12 is embedded in the raft foundation 10 according to the design position and depth of the foundation bolts 30 while the raft foundation 10 is supported, after the initial setting of concrete, the embedded part 12 is taken out to form the preformed hole 13 on the raft foundation, the steel rail 20 is placed at the appointed position of the raft foundation, the preformed hole 13 can be used for inserting and installing the foundation bolts 30 on the steel rail 20, and then fine stone concrete or non-shrinkage fine stone concrete is used for secondary pouring into the preformed hole 13 to fix the foundation bolts 30. Through the anchor bolts 30 and the adjusting jackscrews 40 arranged on the steel rail 20, when the elevation and the levelness of the steel rail 20 are adjusted, the mode that the adjusting jackscrews 40 and the fixing nuts 31 act simultaneously is adopted, so that the precision and the levelness of the steel rail 20 are reduced, and through the arrangement of the adjusting jackscrews 40 at the end of the steel rail 20, the elevation and the levelness of the steel rail 20 are adjusted, the anchor bolts 30 and the nuts 31 are matched for locking and fixing, the leveling of the heavy steel rail 20 is facilitated, and the construction difficulty is reduced; the steel rail 20 is further fixed by filling plain concrete 60 around the steel rail 20, and the integrity of the group of steel rails 20 is enhanced.
The quality control method in this construction method is described below:
1. Admission acceptance of rail 20: HT250 is selected as the material of the steel rail 20, and reference is made to gray cast iron (GB/T9439-2010); the steel rail casting cannot have casting defects such as air holes, sand holes, cracks and the like; aging treatment is carried out on the steel rail casting; spraying antirust paint on the non-processing surface of the steel rail casting; carrying out acute angle dulling treatment on the steel rail casting water chestnut; the minimum tensile strength of the steel rail casting is 200MPa; the maximum bending stress is 29.40Mpa.
2. Rail 20 mounting plane position control
(1) The plane position control of the preformed hole 13 of the foundation bolt 30: the method comprises the steps of measuring and releasing two horizontal and vertical control lines on a cushion layer by using a total station, using a tape measure to measure and release the axis of an anchor bolt 30, using the intersection point of the horizontal and vertical axes as the center point of the anchor bolt 30, drawing a circle by using the center point as the center of a circle and using 100mm as the radius (the radius of a template of a circular preformed hole 13 and the radius of an circumscribed circle of a square wooden plug body), determining the template installation boundary position of the preformed hole 13, taking care of avoiding the boundary position in the reinforcement binding process, controlling the plane position of the template installation of the preformed hole 13 strictly according to the boundary line, and ensuring the template to be vertical after reinforcing the template, wherein the position deviation is not more than 20mm.
(2) And (3) controlling the rough plane position of the steel rail 20: and a total station is used for measuring and releasing transverse and longitudinal control lines, a tape measure is used for measuring and releasing boundary lines of each steel rail 20, an ink-ejecting line is used for marking on the raft foundation 10, when the steel rail 20 is placed, the steel rail is lowered to 3cm away from the top surface of the raft foundation 10, the deviation of the boundary lines and the boundary lines of the steel rail 20 is visually detected, 1 person is arranged at two ends to conduct centering adjustment, 1 person is arranged in the middle to observe the deviation condition of the steel rail 20, the steel rail slowly descends after centering, and the rough and flat installation precision plane position deviation of the steel rail 20 is ensured to be not more than +/-5 mm.
(3) And (3) controlling the precise plane position of the steel rail 20: after the steel rail 20 is rough and flat and the anchor bolt preformed hole 13 is poured and reaches the strength, the elevation and the levelness of the steel rail 20 are matched for simultaneous adjustment, the nuts 31 of the anchor bolts 30 are required to be loosened during adjustment, the end of the steel rail 20 is pried by using a crow bar, a tape measure is pulled between the finished steel rail 20 and the steel rail 20 to be adjusted, the adjustment allowance is controlled through the interval, and the plane position deviation of the precision of precise installation is ensured not to be larger than 2mm.
3. Rail 20 mounting elevation and levelness control
(1) Rough leveling control of the steel rail 20: the concrete pouring finishing surface of the raft foundation 10 is subjected to plastering and pressing treatment, and a basic platform is provided for placing the steel rail 20; before the steel rail 20 is placed, an adjusting jackscrew 40 with the same length is screwed into the bottom plate 22 of the steel rail 20, a gasket 41 is placed at the lower part of the adjusting jackscrew 40, after the steel rail 20 is hung at a designated position, the length of the jackscrew 40 is adjusted by using a wrench, and the elevation and levelness of the steel rail 20 are controlled; the elevation of the first group of steel rails 20 is controlled by a level gauge (the progress is 2 mm/m), and the subsequent elevation of the steel rails 20 is controlled by a five-line gauge by taking the first group of steel rails 20 as a reference, so that the adjustment speed is increased; the deviation of rough installation elevation and levelness is not more than 5mm.
(2) Fine leveling control of the rail 20: after grouting 50 or concrete in the reserved holes 13 is poured and reaches the strength, loosening nuts 31 of foundation bolts 30, placing a five-wire instrument and a level (0.25 mm/m) on the steel rail 20, dynamically adjusting and reading, adjusting the length of a jackscrew 40 by adjusting one end, adjusting the elevation to plus 2mm (considering the influence on the elevation after tightening the foundation bolts 30), simultaneously observing whether the air bubble of the level is centered, simultaneously tightening nuts 31 of the foundation bolts 30 on two sides of the end of the steel rail 20 after the adjustment is qualified, synchronously screwing nuts 31 on two sides, checking the elevation and the level of the steel rail 20 again after the tightening, readjusting the other end after the adjustment is finished, placing the level in the middle of the steel rail 20 after the elevation and the levelness of two ends of the steel rail 20 are all required, observing whether the air bubble is centered, and roughly installing the elevation and the levelness deviation are not more than 2mm.
4. After the anchor bolts 30 are screwed down, a torque wrench is used for detecting that the screwing torque is not smaller than 240 N.m. When concrete is poured, the discharging hose of the concrete pump truck is strictly forbidden to directly aim at the ground rail for discharging, and the concrete discharging can only be carried out outside the ground rail range. The concrete should not be vibrated by contacting the vibrating bar with the ground rail.
In summary, in the construction method, the anchor bolts 30 are installed in the reserved holes 13, and the inner diameters (140 mm square holes and 140mm circular holes) of the reserved holes 13 are measured) The diameter (M27) of the anchor bolt 30 is far larger than that of the anchor bolt 30, the reserved hole 13 of the anchor bolt 30 is filled after the steel rail 20 is in place and the anchor bolt 30 is installed, and the installation accuracy of the anchor bolt 30 is effectively guaranteed by controlling the position of the reserved hole 13, so that the offset reworking of the anchor bolt 30 is avoided. The adjusting jackscrews 40 are arranged on the end bottom plates 22 of the steel rails 20, the elevation of the steel rails 20 is controlled, the operation is convenient, and the defect that the adjusting length of the positioning nuts 31 is insufficient in the traditional technology is effectively overcome by placing the gaskets 41 with different thicknesses on the lower parts of the adjusting jackscrews 40, so that the installation accuracy of the steel rails 20 is improved.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The group ground steel rail construction method is characterized by comprising the following steps of:
S1, anchor bolt preformed holes; measuring and lofting positions, corresponding to anchor bolts on steel rails, on a foundation cushion layer, arranging a reinforcement engineering and a template engineering, burying an embedded part at the designed positions of the anchor bolts before concrete pouring, pouring concrete, taking out the embedded part after initial setting and before final setting of the concrete, and forming preformed holes of the anchor bolts on the foundation, wherein the inner diameters of the preformed holes are larger than the outer diameters of the anchor bolts;
S2, rough leveling of the steel rail; paying off the steel rail positions according to a plane layout diagram of the steel rail, sequentially hoisting each group of steel rails on the foundation, installing foundation bolts and adjusting jackscrews at least at two ends of a steel rail bottom plate before the steel rails are placed on the foundation, enabling the foundation bolts to penetrate through the steel rails, enabling the adjusting jackscrews to be in threaded fit with the steel rails, enabling the steel rails to be located on the foundation, enabling the foundation bolts to be inserted into the reserved holes, adjusting the plane positions of the steel rails under control and monitoring of a measuring instrument, and rotating the adjusting jackscrews to adjust elevation and levelness of the steel rails so that the steel rails are rough;
S3, grouting a reserved hole; when the rough leveling of the steel rail is finished, enabling the foundation bolts to be in a vertical state, adjusting nuts on the foundation bolts, enabling the nuts to be located above a bottom plate of the steel rail, and pouring grouting material into the reserved holes;
s4, flattening and fixing the steel rail; after the strength of grouting material in the reserved holes reaches the design requirement, measuring and adjusting the plane position, elevation and levelness of each group of steel rails to meet the requirement, and screwing nuts of all anchor bolts on each group of steel rails to finish the fixation of the steel rails;
s5, reinforcing the steel rail; after the steel rail is installed and accepted, plain concrete is poured around the steel rail, and the steel rail is further reinforced to limit the displacement of the steel rail, and the steel rail and the concrete form a whole;
In the S1 step, the embedded part adopts a wood box or a PVC pipe, a release agent is smeared on the peripheral surface of the embedded part, and a hoop is formed at the position corresponding to the embedded part of the bottom plate steel bar in the foundation by spot welding so as to stabilize the embedded part;
In the step S4, after the strength of the grouting material in the preformed hole reaches the design requirement, when at least one of the plane position, elevation and levelness of the steel rail does not meet the requirement, the nuts on all the anchor bolts are loosened, the deviation of the plane position of the steel rail is adjusted by using a crow bar, the deviation of the levelness and elevation of the steel rail is adjusted by using an adjusting jackscrew until the plane position, elevation and levelness of the steel rail meet the requirement, after the steel rail is precisely leveled in place, the nuts of the anchor bolts are screwed to fix the steel rail, and after the nuts are fixed, the plane position, elevation and levelness of the steel rail are rechecked again.
2. The method for constructing the group ground steel rail according to claim 1, wherein in the step S1, when the concrete of the foundation is poured, the periphery of the embedded part is symmetrically and uniformly blanked so as to prevent the vibrating rod from touching the embedded part, and after the embedded part is taken out to form the preformed hole, the hole opening of the preformed hole is covered so as to prevent sundries from falling into the hole.
3. A method of constructing a group of ground rails as claimed in claim 1 wherein in step S2, a spacer is placed on said foundation at a position corresponding to said adjustment screw before said rails are placed on said foundation, said spacer being adapted to bear the lower end of said adjustment screw to prevent intrusion into said foundation when said adjustment screw is rotated.
4. A method of constructing a group of ground rails as claimed in claim 3 wherein the rail is lowered until the anchor bolts are close to the preformed holes, the rail is stopped from lowering, the anchor bolts are checked and adjusted to align with the corresponding preformed holes to ensure that the anchor bolts enter the preformed holes and the adjustment jack screws are centered in the shims.
5. The method of constructing a plurality of ground rails according to claim 4, wherein in step S2, after the rails are in place, it is observed whether the position of the anchor bolt is located at the center of the reserved hole, if the position of the anchor bolt does not meet the requirement, the position of the rails is adjusted by using a crow bar, so that the position of the rails meets the requirement of rough flatness accuracy, and each group of rails is controlled on a straight line by using a laser five-wire gauge.
6. The method for constructing the group ground steel rail according to claim 1, wherein in the step S3, before casting grouting material into the reserved holes, dust and peeled sand in the reserved holes are cleaned, the inner walls of the reserved holes are subjected to wetting treatment, finished products of the foundation bolts are protected, and the grouting material is vibrated in the casting process of casting the reserved holes, so that casting compactness is guaranteed.
7. The method of constructing a group of ground rails as claimed in claim 1, wherein in step S4, the adjustment of the entire leveling of the same group of rails is performed by rotating the adjustment jack, one by one from one end to the other end of the rails.
8. The method of constructing a group of ground rails as claimed in claim 1, wherein in step S5, before casting concrete, the T-shaped groove of the rail is covered with a film, and when plain concrete is cast, the concrete is filled to a position 10mm below the top surface of the rail.
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| CN102373713A (en) * | 2011-11-22 | 2012-03-14 | 中国水利水电第十四工程局有限公司 | Construction method and device for preserved hole of equipment foundation bolt |
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| CN106758562A (en) * | 2017-04-08 | 2017-05-31 | 中国二十二冶集团有限公司 | The installation method that track foundation built-in fitting is integrally fixed with track |
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| ATE184934T1 (en) * | 1994-11-30 | 1999-10-15 | Hochtief Ag Hoch Tiefbauten | METHOD FOR THE PRECISE POSITIONAL PRODUCTION OR SETUP OF RAIL SUPPORT POINTS AND MACHINE SYSTEM FOR PERFORMING THE METHOD |
| KR200196602Y1 (en) * | 1998-06-12 | 2000-10-02 | 신종서 | Rail-arrangement bar |
| CN103774684B (en) * | 2014-01-21 | 2016-03-02 | 浙江省建工集团有限责任公司 | Construction method is established in a kind of the reserved of foundation bolt hole |
| CN104652467A (en) * | 2014-12-28 | 2015-05-27 | 中国二冶集团有限公司 | Construction method for reserved hole of equipment foundation bolt |
| CN204780983U (en) * | 2015-06-10 | 2015-11-18 | 宏盛建业投资集团有限公司 | Whole pre -buried major diameter bolt crowd structure of raft board basis high accuracy |
| CN107178091B (en) * | 2016-03-10 | 2019-04-23 | 五冶集团上海有限公司 | The pinpoint method of can-type calcine furnace steel construction pillar embedding anchor bolts |
| CN114369976B (en) * | 2021-12-23 | 2023-08-22 | 中国华冶科工集团有限公司 | Method for laying ground rail with interval support |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373713A (en) * | 2011-11-22 | 2012-03-14 | 中国水利水电第十四工程局有限公司 | Construction method and device for preserved hole of equipment foundation bolt |
| CN102529750A (en) * | 2012-02-03 | 2012-07-04 | 天津二十冶建设有限公司 | Insulation structure of ground power supply sliding contact wire of electric flat car and construction technology thereof |
| CN106758562A (en) * | 2017-04-08 | 2017-05-31 | 中国二十二冶集团有限公司 | The installation method that track foundation built-in fitting is integrally fixed with track |
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