CN110031173B - High-precision heavy rail embedded part construction method - Google Patents
High-precision heavy rail embedded part construction method Download PDFInfo
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- CN110031173B CN110031173B CN201810774475.4A CN201810774475A CN110031173B CN 110031173 B CN110031173 B CN 110031173B CN 201810774475 A CN201810774475 A CN 201810774475A CN 110031173 B CN110031173 B CN 110031173B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 152
- 239000010959 steel Substances 0.000 claims abstract description 152
- 238000009434 installation Methods 0.000 claims abstract description 21
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 13
- 238000011900 installation process Methods 0.000 claims abstract description 5
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- 230000005484 gravity Effects 0.000 description 2
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a high-precision heavy rail embedded part construction method, which comprises the following steps: excavating a concave strip foundation pit according to the measurement paying-off position; carrying out foundation pit treatment, and embedding a steel plate and a reinforcing steel bar head in advance; a group of supporting frames are arranged on each steel plate; and respectively installing track embedded parts on the left side and the right side of the foundation pit, adjusting the installation precision in the installation process, and then pouring concrete in the foundation pit in two steps. The method adopts the addition of the positioning support frame and the real-time precision measurement, better solves the construction positioning problem of large and high-precision embedded parts, and ensures that the installation of the simulation collision test equipment is very smooth. Two theodolites are arranged in the XY direction to ensure the mounting precision of the support frame and the precision of the track embedded part direction.
Description
Technical Field
The invention relates to a method for embedding a part, in particular to a method for embedding a part in a high-precision heavy rail.
Background
Along with the continuous development of the state science and technology level and the acceleration of the industrialization pace of scientific and technological achievements, various high-technology laboratories have higher requirements on the manufacturing and installation of embedded parts due to the requirement of accurate installation of detection equipment, the manufacturing precision is required to be high, the embedded parts are embedded accurately, the weight of the embedded parts is increased continuously, the weight of a single embedded part in large-scale projects is about 300-600 kg, some embedded parts have the weight of several tons, the quantity of anchor bars (or anchor plates) at the bottoms of the embedded parts is increased more and more, the installation difficulty of the embedded parts is increased greatly, the installation precision is influenced, and the installation precision of the embedded parts directly influences the accuracy of test data. The automobile engineering simulation collision test has the main function of simulating and testing the damage degree of parts in an automobile to a human body at the moment of collision of the automobile. The specific operation process is that spare part and dummy in the car are placed on a mobilizable platform, and the platform can simulate the vehicle and take place to the static state by developments when bumping, checks whether the dangerous condition such as scattering can take place for vehicle inner part, splashes, on the other hand obtains the data that receive the injury from dummy on one's body. Because of the requirement of test equipment, the embedded parts of the simulation collision test chamber comprise a plurality of groups of rail embedded parts, and powerful measures are adopted to strengthen the installation of large-scale prefabricated embedded parts and ensure the installation precision of the embedded parts.
Chinese patent with application number CN201720473182.3 discloses a "deep hole plane gate slot embedded part installation device", which comprises a rectangular support frame; the support frame is fixed at the top of the opening of the door slot, a transverse fixing frame is arranged in the middle of the support frame, a threading plate is connected to the fixing frame, and a threading hole is formed in the center of the threading plate; the steel wire passes through the threading hole and is connected with the gravity hanging hammer. The gravity hammerhead is arranged in an oil drum containing liquid. This patent is not suitable for the construction of rail inserts for automotive simulated crash testing.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-precision heavy rail embedded part construction method which is convenient and firm to construct and install, high in precision and large in structural bearing capacity and rigidity.
A high-precision heavy rail embedded part construction method comprises the following steps:
(1) measuring and setting out at the position where the high-precision heavy rail embedded part is to be installed, and then excavating a concave strip foundation pit according to the measuring and setting-out position;
(2) respectively installing reinforcing steel bars at the bottom wall, the peripheral side walls and the top edge of the foundation pit and pouring a concrete wall surface, pre-burying steel plates in the concrete of the bottom wall of the foundation pit along the length direction of the foundation pit and in the front and rear of the middle of the foundation pit at intervals, and pre-burying two rows of reinforcing steel bar heads in the concrete of the bottom wall of the foundation pit along the length direction of the foundation pit and on the left side and the right side of the foundation pit respectively;
(3) installing a group of supporting frames on each steel plate, connecting a second auxiliary transverse ejector rod of each group of supporting frames with the steel plate on the bottom wall of the foundation pit, installing a left bolt and a right bolt on the end head of the left side wall and the end head of the right side wall of a main transverse ejector rod of each group of supporting frames respectively along the horizontal direction, then respectively arranging a theodolite in the longitudinal and transverse directions of the foundation pit, and respectively detecting the horizontal precision of the longitudinal and transverse directions of a track; each group of support frames comprises two vertical ejector rods which are arranged at intervals along the left and right direction, the top and the bottom between the two vertical ejector rods 14 are respectively connected with the main transverse ejector rod and the second auxiliary transverse ejector rod along the horizontal direction, and the first auxiliary transverse ejector rod is connected between the two vertical ejector rods between the main transverse ejector rod and the second auxiliary transverse ejector rod along the horizontal direction;
(4) the first segment track embedded part is arranged at the starting end of the left side of the foundation pit and comprises a bottom wall steel plate supported on the bottom wall of the foundation pit and a top wall steel plate arranged in parallel and at intervals right above the bottom wall steel plate, the bottom wall steel plate is welded with a reinforcing steel bar head on the bottom wall of the foundation pit, the front end and the rear end of the top wall steel plate are respectively supported on the top wall of the left side of a main transverse ejector rod adjacent to a group of supporting frames, and the bottom wall steel plate and the top wall steel plate are fixedly connected through two bolts arranged in the vertical direction;
(5) repeating the step (4) to install a second section of track embedded part with the same structure as the first section of track embedded part at the right start end of the foundation pit, wherein the second section of track embedded part and the first section of track embedded part are installed in a bilateral symmetry mode by taking the bilateral symmetry plane of the support frame as a symmetry axis;
(6) adjusting the installation precision, comprising the following steps:
(a) measuring the horizontal position deviation of a top wall steel plate of the first section of track embedded part and a top wall steel plate of the second section of track embedded part through a theodolite;
(b) the horizontal positions of a top wall steel plate of the first section of track embedded part and a top wall steel plate of the second section of track embedded part are adjusted once by screwing a bolt of the first section of track embedded part and a bolt of the second section of track embedded part, and the horizontal position deviation of the top wall steel plate of the first section of track embedded part, the horizontal position deviation of the top wall steel plate of the second section of track embedded part and the horizontal position deviation between the top wall steel plate of the first section of track embedded part and the top wall steel plate of the second section of track embedded part are smaller than 0.25mm by using a theodolite to detect while adjusting;
(c) adjusting the left bolt and the right bolt on the main cross ejector rod to enable the left bolt and the right bolt to respectively extrude a top wall steel plate supported on the main cross ejector rod to adjust the horizontal positions of the top wall steel plate of the first section of track embedded part and the top wall steel plate of the second section of track embedded part for two times, so that the horizontal position deviation of the top wall steel plate of the first section of track embedded part, the horizontal position deviation of the top wall steel plate of the second section of track embedded part and the horizontal position deviation between the top wall steel plate of the first section of track embedded part and the top wall steel plate of the second section of track embedded part are smaller than 0.2 mm;
(d) fixedly connecting the left end and the right end of the first auxiliary cross ejector rod with bolts of the rail embedded parts on the corresponding sides respectively;
(7) repeating the steps (4) - (6) to install a third section of track embedded part at the end of the first section of track embedded part and a fourth section of track embedded part at the end of the symmetrical second section of track embedded part; adjusting the horizontal deviation between first top wall steel plates of the left track embedded parts, the horizontal deviation between second top wall steel plates of the right track embedded parts and the horizontal deviation between the top wall steel plates of the left track embedded parts and the top wall steel plates of the right track embedded parts within 0.2mm in the installation process, inserting a thin steel plate into the joint of the tail end of the first track embedded parts and the head end of the third track embedded parts, and inserting the thin steel plate into the joint of the tail end of the second track embedded parts and the head end of the fourth track embedded parts;
(8) repeating the step (7), sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the left side, and sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the right side until the installation of the whole track embedded part is completed;
(9) pouring first-step concrete in the foundation pit to a position with a preset distance between the bottom wall of the top wall steel plate on the left side and the bottom wall of the top wall steel plate on the right side;
(10) detecting the integral horizontal position deviation of the top wall steel plate of the embedded part of the track by adopting a theodolite, and if the horizontal position deviation between the top wall steel plates of the embedded part of each section of track exceeds 0.2mm, finely adjusting the bolts of the embedded part of the corresponding section of track until the integral horizontal position deviation of the top wall steel plates of the embedded part of the track is within 0.2 mm;
(11) and pouring second-step concrete in the foundation pit until the top surface of the foundation pit is reached.
The method adopts the addition of the positioning support frame and the real-time precision measurement, better solves the construction positioning problem of large and high-precision embedded parts, and ensures that the installation of the simulation collision test equipment is very smooth. Two theodolites are arranged in the XY direction to ensure the mounting precision of the support frame and the precision of the track embedded part direction. Thin steel plates are inserted into the joint parts between the embedded parts of the rails, so that the butt joint accuracy is enhanced.
Drawings
FIG. 1 is a schematic diagram of a construction structure of a support frame of a high-precision heavy-duty track embedded part construction method;
FIG. 2 is a schematic diagram of a track embedded part construction structure of the high-precision heavy-duty track embedded part construction method;
FIG. 3 is a schematic diagram of a support frame and a rail embedded part mounting structure of a high-precision heavy rail embedded part construction method of the invention;
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The invention discloses a high-precision heavy rail embedded part construction method as shown in the attached drawing, which comprises the following steps:
(1) measuring and setting out at the position where the high-precision heavy rail embedded part is to be installed, and then excavating a concave strip foundation pit according to the measuring and setting-out position;
(2) the reinforcing steel bars are respectively installed at the bottom wall 1 of the foundation pit, the peripheral side walls 2 and the top edge 3 of the foundation pit, the concrete wall surface is poured, steel plates 16 are pre-embedded in the concrete of the bottom wall 1 of the foundation pit along the length direction of the foundation pit and in the front and back of the middle of the foundation pit at intervals, and two rows of reinforcing steel bar heads 15 are pre-embedded in the concrete of the bottom wall 1 of the foundation pit along the length direction of the foundation pit and in the left side and the right side of the.
(3) And a group of support frames are arranged on each steel plate, and the second auxiliary transverse ejector rod 12 of each group of support frames is connected with the steel plate 16 on the bottom wall 1 of the foundation pit. Installing a left bolt 17-1 and a right bolt 17-2 in the horizontal direction at the end head of the left side wall and the end head of the right side wall of the main transverse ejector rod 10 of each group of supporting frames respectively, and then arranging a theodolite in the longitudinal direction and the transverse direction of the foundation pit respectively to detect the horizontal precision of the rail in the longitudinal direction and the transverse direction respectively; each group of support frames comprises two vertical ejector rods 14 which are arranged at intervals along the left and right direction, the top and the bottom between the two vertical ejector rods 14 are respectively connected with the main transverse ejector rod 10 and the second auxiliary transverse ejector rod 12 along the horizontal direction, and a first auxiliary transverse ejector rod 11 is connected between the two vertical ejector rods 14 between the main transverse ejector rod 10 and the second auxiliary transverse ejector rod 12 along the horizontal direction;
preferably, two scissor rods 13 are fixed on the two vertical ejector rods 14, the main transverse ejector rod 10, the first auxiliary transverse ejector rod 11 and the second auxiliary transverse ejector rod 12 in a crossed manner.
(4) And a first section of track embedded part is arranged at the starting end of the left side of the foundation pit, the first section of track embedded part comprises a bottom wall steel plate 4 supported on the bottom wall of the foundation pit and a top wall steel plate 6 arranged right above the bottom wall steel plate 4 at a parallel interval, and the bottom wall steel plate 4 is connected with a reinforcing steel bar head 15 on the bottom wall 1 of the foundation pit in a welding way. The front end and the rear end of the top wall steel plate 6 are respectively supported on the left top wall of the main cross ejector rod 10 adjacent to one group of supporting frames. The bottom wall steel plate and the top wall steel plate are fixedly connected through two bolts 5 arranged along the vertical direction;
(5) and (5) repeating the step (4) to install a second segment track embedded part with the same structure as the first segment track embedded part at the right starting end of the foundation pit. The second section of track embedded part and the first section of track embedded part are symmetrically arranged in the left-right direction by taking the left-right symmetrical plane of the support frame as a symmetrical axis;
(6) adjusting the installation precision, comprising the following steps:
(a) measuring the horizontal position deviation of a top wall steel plate 6 of the first section of track embedded part and a top wall steel plate 7 of the second section of track embedded part through a theodolite;
(b) the horizontal positions of a top wall steel plate 6 of the first section of track embedded part and a top wall steel plate 7 of the second section of track embedded part are adjusted once by screwing a bolt 5 of the first section of track embedded part and a bolt 8 of the second section of track embedded part, and the horizontal position deviation of the top wall steel plate 6 of the first section of track embedded part, the horizontal position deviation of the top wall steel plate 7 of the second section of track embedded part and the horizontal position deviation between the top wall steel plate 6 of the first section of track embedded part and the top wall steel plate 7 of the second section of track embedded part are smaller than 0.25mm, such as 0.24mm, by detecting with a theodolite while adjusting;
(c) adjusting a left bolt 17-1 and a right bolt 17-2 on the main cross ejector rod 10 to enable the left bolt 17-1 and the right bolt 17-2 to respectively press a top wall steel plate supported on the main cross ejector rod 10 to adjust the horizontal positions of a top wall steel plate 6 of a first section of track embedded part and a top wall steel plate 7 of a second section of track embedded part for the second time, so that the horizontal position deviation of the top wall steel plate 6 of the first section of track embedded part, the horizontal position deviation of the top wall steel plate 7 of the second section of track embedded part and the horizontal position deviation between the top wall steel plate 6 of the first section of track embedded part and the top wall steel plate 7 of the second section of track embedded part are smaller than 0.2 mm;
(d) the left end and the right end of the first auxiliary cross ejector rod 11 are respectively fixedly connected with bolts 5(8) of the rail embedded parts on the corresponding sides;
(7) repeating the steps (4) - (6) to install a third section of track embedded part at the end of the first section of track embedded part and a fourth section of track embedded part at the end of the symmetrical second section of track embedded part; the horizontal deviation between the first top wall steel plates 6 of the left-side track embedded parts, the horizontal deviation between the second top wall steel plates 7 of the right-side track embedded parts and the horizontal deviation between the top wall steel plates 6 of the left-side track embedded parts and the top wall steel plates 7 of the right-side track embedded parts are adjusted to be within 0.2mm in the installation process. Then inserting a thin steel plate into the joint part of the tail end of the first section of track embedded part and the head end of the third section of track embedded part to enhance the butt joint accuracy; and a thin steel plate is inserted into the joint part of the tail end of the second section of track embedded part and the head end of the fourth section of track embedded part, so that the butt joint accuracy is enhanced.
(8) And (5) repeating the step (7), sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the left side, and sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the right side until the installation of the whole track embedded part is completed.
(9) And pouring first-step concrete in the foundation pit to a position with a preset distance from the left top wall steel plate bottom wall to the right top wall steel plate bottom wall lower skin, wherein the distance from the left top wall steel plate bottom wall lower skin to the right top wall steel plate bottom wall lower skin is usually 4.5cm-5 cm.
(10) Because of the roof steel sheet 6 of the first section track embedded part and the roof steel sheet 7 of the second section track embedded part installation horizontal deviation requirement is less than 0.2mm, it is very likely that the embedded part takes place small skew when pouring the concrete, in order to take fine adjustment measures, ensure the embedded part installation accuracy, detect the whole horizontal position deviation of the roof steel sheet of the track embedded part with the theodolite, if the horizontal position deviation between the roof steel sheet of each section track embedded part exceeds 0.2mm, then finely adjust the bolt of the track embedded part of the corresponding section until the whole horizontal position deviation of the roof steel sheet of the track embedded part is within 0.2 mm.
(11) And pouring second-step concrete in the foundation pit until the top surface of the foundation pit is reached.
Examples
(1) Measuring and setting out at the position where the high-precision heavy rail embedded part is to be installed, and then excavating a concave strip foundation pit according to the measuring and setting-out position;
(2) the reinforcing steel bars are respectively installed at the bottom wall 1 of the foundation pit, the peripheral side walls 2 and the top edge 3 of the foundation pit, the concrete wall surface is poured, steel plates 16 are pre-embedded in the concrete of the bottom wall 1 of the foundation pit along the length direction of the foundation pit and in the front and back of the middle of the foundation pit at intervals, and two rows of reinforcing steel bar heads 15 are pre-embedded in the concrete of the bottom wall 1 of the foundation pit along the length direction of the foundation pit and in the left side and the right side of the.
(3) And a group of support frames are arranged on each steel plate, and the second auxiliary transverse ejector rod 12 of each group of support frames is connected with the steel plate 16 on the bottom wall 1 of the foundation pit. Installing a left bolt 17-1 and a right bolt 17-2 in the horizontal direction at the end head of the left side wall and the end head of the right side wall of the main transverse ejector rod 10 of each group of supporting frames respectively, and then arranging a theodolite in the longitudinal direction and the transverse direction of the foundation pit respectively to detect the horizontal precision of the rail in the longitudinal direction and the transverse direction respectively; each group of support frames comprises two vertical ejector rods 14 which are arranged at intervals along the left and right direction, the top and the bottom between the two vertical ejector rods 14 are respectively connected with the main transverse ejector rod 10 and the second auxiliary transverse ejector rod 12 along the horizontal direction, and a first auxiliary transverse ejector rod 11 is connected between the two vertical ejector rods 14 between the main transverse ejector rod 10 and the second auxiliary transverse ejector rod 12 along the horizontal direction;
two scissor rods 13 are fixed on the two vertical ejector rods 14, the main transverse ejector rod 10, the first auxiliary transverse ejector rod 11 and the second auxiliary transverse ejector rod 12 in a crossed manner.
(4) And a first section of track embedded part is arranged at the starting end of the left side of the foundation pit, the first section of track embedded part comprises a bottom wall steel plate 4 supported on the bottom wall of the foundation pit and a top wall steel plate 6 arranged right above the bottom wall steel plate 4 at a parallel interval, and the bottom wall steel plate 4 is connected with a reinforcing steel bar head 15 on the bottom wall 1 of the foundation pit in a welding way. The front end and the rear end of the top wall steel plate 6 are respectively supported on the left top wall of the main cross ejector rod 10 adjacent to one group of supporting frames. The bottom wall steel plate and the top wall steel plate are fixedly connected through two bolts 5 arranged along the vertical direction;
(5) and (5) repeating the step (4) to install a second segment track embedded part with the same structure as the first segment track embedded part at the right starting end of the foundation pit. The second section of track embedded part and the first section of track embedded part are symmetrically arranged in the left-right direction by taking the left-right symmetrical plane of the support frame as a symmetrical axis;
(6) adjusting the installation precision, comprising the following steps:
(a) measuring the horizontal position deviation of a top wall steel plate 6 of the first section of track embedded part and a top wall steel plate 7 of the second section of track embedded part through a theodolite;
(b) the horizontal positions of a top wall steel plate 6 of the first section of track embedded part and a top wall steel plate 7 of the second section of track embedded part are adjusted once by screwing a bolt 5 of the first section of track embedded part and a bolt 8 of the second section of track embedded part, and the horizontal position deviation of the top wall steel plate 6 of the first section of track embedded part, the horizontal position deviation of the top wall steel plate 7 of the second section of track embedded part and the horizontal position deviation between the top wall steel plate 6 of the first section of track embedded part and the top wall steel plate 7 of the second section of track embedded part are 0.24mm by detecting with a theodolite while adjusting;
(c) adjusting a left bolt 17-1 and a right bolt 17-2 on the main cross ejector rod 10 to enable the left bolt 17-1 and the right bolt 17-2 to respectively press a top wall steel plate supported on the main cross ejector rod 10 to adjust the horizontal positions of the top wall steel plate 6 of the first section of track embedded part and the top wall steel plate 7 of the second section of track embedded part for the second time, so that the horizontal position deviation of the top wall steel plate 6 of the first section of track embedded part, the horizontal position deviation of the top wall steel plate 7 of the second section of track embedded part and the horizontal position deviation between the top wall steel plate 6 of the first section of track embedded part and the top wall steel plate 7 of the second section of track embedded part are 0.19 mm;
(d) the left end and the right end of the first auxiliary cross ejector rod 11 are respectively fixedly connected with bolts 5(8) of the rail embedded parts on the corresponding sides;
(7) repeating the steps (4) - (6) to install a third section of track embedded part at the end of the first section of track embedded part and a fourth section of track embedded part at the end of the symmetrical second section of track embedded part; the horizontal deviation between the first top wall steel plates 6 of the left-side track embedded parts, the horizontal deviation between the second top wall steel plates 7 of the right-side track embedded parts and the horizontal deviation between the top wall steel plates 6 of the left-side track embedded parts and the top wall steel plates 7 of the right-side track embedded parts are adjusted to be 0.19mm in the installation process respectively. Then inserting a thin steel plate into the joint part of the tail end of the first section of track embedded part and the head end of the third section of track embedded part to enhance the butt joint accuracy; and a thin steel plate is inserted into the joint part of the tail end of the second section of track embedded part and the head end of the fourth section of track embedded part, so that the butt joint accuracy is enhanced.
(8) And (5) repeating the step (7), sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the left side, and sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the right side until the installation of the whole track embedded part is completed.
(9) And pouring first-step concrete in the foundation pit until the bottom wall of the top wall steel plate on the left side and the bottom wall of the top wall steel plate on the right side are 4.5cm lower.
(10) And detecting the integral horizontal position deviation of the top wall steel plate of the embedded part of the track by using a theodolite, wherein the horizontal position deviation between the top wall steel plates of the embedded part of each section of the track exceeds 0.2mm, and finely adjusting the bolts of the embedded part of the track of the corresponding section until the integral horizontal position deviation of the top wall steel plate of the embedded part of the track is 0.19 mm.
(11) And pouring second-step concrete in the foundation pit until the top surface of the foundation pit is reached. Through detection: the simulation collision test equipment is installed smoothly.
Claims (2)
1. A high-precision heavy rail embedded part construction method is characterized by comprising the following steps:
(1) measuring and setting out at the position where the high-precision heavy rail embedded part is to be installed, and then excavating a concave strip foundation pit according to the measuring and setting-out position;
(2) respectively installing reinforcing steel bars at the bottom wall, the peripheral side walls and the top edge of the foundation pit and pouring a concrete wall surface, pre-burying steel plates in the concrete of the bottom wall of the foundation pit along the length direction of the foundation pit and in the front and rear of the middle of the foundation pit at intervals, and pre-burying two rows of reinforcing steel bar heads in the concrete of the bottom wall of the foundation pit along the length direction of the foundation pit and on the left side and the right side of the foundation pit respectively;
(3) a group of supporting frames are arranged on each steel plate, each group of supporting frames comprises two vertical ejector rods which are arranged at intervals along the vertical direction, the top and the bottom between the two vertical ejector rods are respectively connected with a main transverse ejector rod and a second auxiliary transverse ejector rod along the horizontal direction, and a first auxiliary transverse ejector rod is connected between the two vertical ejector rods between the main transverse ejector rod and the second auxiliary transverse ejector rod along the horizontal direction; connecting the second auxiliary transverse ejector rod of each group of support frames with a steel plate on the bottom wall of the foundation pit, installing a left bolt and a right bolt on the end head of the left side wall and the end head of the right side wall of the main transverse ejector rod of each group of support frames respectively along the horizontal direction, then respectively arranging a theodolite in the longitudinal and transverse directions of the foundation pit, and respectively detecting the horizontal precision of the rail in the longitudinal and transverse directions;
(4) the first segment track embedded part is arranged at the starting end of the left side of the foundation pit and comprises a bottom wall steel plate supported on the bottom wall of the foundation pit and a top wall steel plate arranged in parallel and at intervals right above the bottom wall steel plate, the bottom wall steel plate is welded with a reinforcing steel bar head on the bottom wall of the foundation pit, the front end and the rear end of the top wall steel plate are respectively supported on the top wall of the left side of a main transverse ejector rod adjacent to a group of supporting frames, and the bottom wall steel plate and the top wall steel plate are fixedly connected through two bolts arranged in the vertical direction;
(5) repeating the step (4) to install a second section of track embedded part with the same structure as the first section of track embedded part at the right start end of the foundation pit, wherein the second section of track embedded part and the first section of track embedded part are installed in a bilateral symmetry mode by taking the bilateral symmetry plane of the support frame as a symmetry axis;
(6) adjusting the installation precision, comprising the following steps:
(a) measuring the horizontal position deviation of a top wall steel plate of the first section of track embedded part and a top wall steel plate of the second section of track embedded part through a theodolite;
(b) the horizontal positions of a top wall steel plate of the first section of track embedded part and a top wall steel plate of the second section of track embedded part are adjusted once by screwing a bolt of the first section of track embedded part and a bolt of the second section of track embedded part, and the horizontal position deviation of the top wall steel plate of the first section of track embedded part, the horizontal position deviation of the top wall steel plate of the second section of track embedded part and the horizontal position deviation between the top wall steel plate of the first section of track embedded part and the top wall steel plate of the second section of track embedded part are smaller than 0.25mm by using a theodolite to detect while adjusting;
(c) adjusting the left bolt and the right bolt on the main cross ejector rod to enable the left bolt and the right bolt to respectively extrude a top wall steel plate supported on the main cross ejector rod to adjust the horizontal positions of the top wall steel plate of the first section of track embedded part and the top wall steel plate of the second section of track embedded part for two times, so that the horizontal position deviation of the top wall steel plate of the first section of track embedded part, the horizontal position deviation of the top wall steel plate of the second section of track embedded part and the horizontal position deviation between the top wall steel plate of the first section of track embedded part and the top wall steel plate of the second section of track embedded part are smaller than 0.2 mm;
(d) fixedly connecting the left end and the right end of the first auxiliary cross ejector rod with bolts of the rail embedded parts on the corresponding sides respectively;
(7) repeating the steps (4) - (6) to install a third section of track embedded part at the end of the first section of track embedded part and a fourth section of track embedded part at the end of the symmetrical second section of track embedded part; adjusting the horizontal deviation between first top wall steel plates of the left track embedded parts, the horizontal deviation between second top wall steel plates of the right track embedded parts and the horizontal deviation between the top wall steel plates of the left track embedded parts and the top wall steel plates of the right track embedded parts within 0.2mm in the installation process, inserting a thin steel plate into the joint of the tail end of the first track embedded parts and the head end of the third track embedded parts, and inserting the thin steel plate into the joint of the tail end of the second track embedded parts and the head end of the fourth track embedded parts;
(8) repeating the step (7), sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the left side, and sequentially installing the track embedded parts of the rear side sections behind the last section of track embedded part on the right side until the installation of the whole track embedded part is completed;
(9) pouring first-step concrete in the foundation pit to a position with a preset distance between the bottom wall of the top wall steel plate on the left side and the bottom wall of the top wall steel plate on the right side;
(10) detecting the integral horizontal position deviation of the top wall steel plate of the embedded part of the track by adopting a theodolite, and if the horizontal position deviation between the top wall steel plates of the embedded part of each section of track exceeds 0.2mm, finely adjusting the bolts of the embedded part of the corresponding section of track until the integral horizontal position deviation of the top wall steel plates of the embedded part of the track is within 0.2 mm;
(11) and pouring second-step concrete in the foundation pit until the top surface of the foundation pit is reached.
2. The high-precision heavy rail embedded part construction method according to claim 1, wherein: the two scissor rods are fixed on the two vertical ejector rods, the main transverse ejector rod, the first auxiliary transverse ejector rod and the second auxiliary transverse ejector rod in a crossed manner.
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