Short line method prefabricated segmental beam mounting system and construction method

Abstract

According to the short line method prefabricated segment beam installation system and the construction method, firstly, pier top cast-in-place section pouring construction is conducted by means of a first section matching beam, and then installation of a middle segment beam and a closure segment is conducted in sequence; assembling type vertical supporting frames and sliding supporting frames are arranged on the outer side of the cast-in-place pier; the transverse position of the first section matching beam is controlled through the inclined tie bar, the height adjusting body and the transverse tie bar; height lifting and lifting construction of the prefabricated segmental beam are conducted by means of a segmental lifting body and a beam erecting crane; when a closure section is installed, transverse pressure and pulling force are applied to the first section beam and the second section beam through the opposite supporting and pressing ribs and the supplementary pulling ribs, and freezing shrinkage of the first section beam and the second section beam is conducted synchronously through the external water cooling system and the inner freezing pipe. The installation quality and efficiency of the prefabricated segmental beam can be improved, and the site construction difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the field of reinforced concrete segment installation engineering, and in particular to a short-line prefabricated segment beam installation system and a construction method. Background Art

[0002] Prefabricated segmental beams have been widely used in bridge engineering. The construction process of prefabricated segmental beam bridges usually includes the lifting, erection and closing of segmental beams. How to improve the segmental beam connection positioning accuracy, reduce the impact of the construction environment, and reduce the difficulty of closing the segmental beams has always been a difficult problem affecting the installation process of prefabricated segmental beams.

[0003] At present, the installation construction of prefabricated segmental beams usually adopts the installation of bridge cranes. There is a segmental beam installation device, including a main load-bearing frame and a turning frame for carrying and fixing the segmental beams, to rotate and lift the segmental beams; a tire-type guide beam bridge crane and a segmental beam installation process, the tire-type guide beam bridge crane includes two sets of load-bearing sliding devices and at least two opening and closing trusses, which realize the uniform transfer of the lifting load; a motor-driven automatic walking segmental beam installation full-coverage bottom protection platform enhances the safety of segmental beam erection construction.

[0004] Analysis shows that the above-mentioned segmental beam installation construction mostly uses bridge-erecting machines. There is still room for further research on technical difficulties such as the precise installation and positioning of matching beams during segmental beam erection, the lifting of segmental beams and gantry crane hoisting, and reducing the difficulty of closing segmental beams. Summary of the invention

[0005] The object of the present invention is to provide a short-line prefabricated segmental beam installation system and construction method for solving the above-mentioned technical problems.

[0006] In order to solve the above technical problems, the present invention provides a construction method for a short-line prefabricated segmental beam installation system, comprising the following steps:

[0007] Step 1: Construction preparation: Prefabricate segmental beams in sections, including the first matching beam, the middle segmental beam, the first segmental beam, the second segmental beam and the closing segment; Cast-in-place piers are cast, and built-in anchor bars are preset in the cast-in-place piers; built-in anchor plates are set at the bottom of the built-in anchor bars, and built-in bolts are set near the top of the built-in anchor bars to the cast-in-place piers;

[0008] Step 2: Construction of cast-in-place section at pier top: lower hoop and upper hoop are sequentially arranged on the top of cast-in-place pier from bottom to top, and lower support frame and upper support frame are respectively arranged on the outside of lower support frame and upper support frame, and a height-adjustable support frame connector is arranged between the lower support frame and the upper support frame; support trough plate, connection cushion layer, support box and vertical support frame are sequentially arranged on the lower soil on both sides of cast-in-place pier; concrete pouring of cast-in-place section at pier top is carried out, and after the concrete of cast-in-place section at pier top forms strength, top support frame is arranged on the top of cast-in-place section at pier top, and the support frame bottom plate is firmly connected with the cast-in-place section at pier top by extending anchor bars; one end of the oblique tie bar is connected with the support frame vertical plate on the support frame bottom plate, and the other end is connected with the beam bottom anchor plate at the end of the first matching beam, and a stable upward pulling force is applied to the first matching beam by the oblique tie bar;

[0009] Step 3: Moving the prefabricated segmental beam: laying a moving groove on the upper surface of the lower soil, and making the moving rollers at the bottom of the beam moving trolley move along the moving groove; the beam moving trolley includes a moving support groove, a segment lifting body and a support platform plate, and the segment lifting body is used to connect the moving support groove and the support platform plate; the prefabricated segmental beam is hoisted into the support platform plate, and then the beam moving trolley moves along the moving groove;

[0010] Step 4: Installation of prefabricated segmental beams: a beam erecting crane is set on the lower soil, and column side rails are set on the inner side of the crane column of the beam erecting crane; starting from the cast-in-place bridge pier, the intermediate segmental beam is hoisted and placed gradually towards the middle part of the bridge span; when the intermediate segmental beam is hoisted and placed, the beam erecting crane is first moved to the installation position of the intermediate segmental beam; then the intermediate segmental beam is moved to the bottom of the beam erecting crane by the beam moving trolley, and the intermediate segmental beam is lifted by the segment lifting body, and then the support platform plate together with the intermediate segmental beam is hoisted to the set height by the first winding machine and the first sling on the lower surface of the mobile hanging plate;

[0011] Step 5: Closing the prefabricated segmental beams: Sliding supports are set at the lower parts of the first segmental beams and the second segmental beams on both sides of the closing segment; a beam-erecting crane is used to lift the closing segment between the first segmental beam and the second segmental beam for overlap.

[0012] The beneficial effects of the present invention are:

[0013] (1) The present invention first uses the first matching beam to cast the cast-in-place section of the pier top, and then sequentially installs the intermediate segment beams and the closing segment, which effectively reduces the difficulty of matching and installing the segment beams.

[0014] (2) The present invention arranges assembled vertical supports and sliding supports on the outer side of the cast-in-place pier, which effectively reduces the stability of the vertical support and reduces the positioning accuracy of the prefabricated segmental beams.

[0015] (3) The present invention controls the lateral position of the first section matching beam by means of oblique tie bars, height adjustment bodies and transverse tie bars, thereby reducing the difficulty of positioning the first section matching beam during the maintenance of the cast-in-place section of the pier top.

[0016] (4) The present invention first uses a moving channel and a beam-moving trolley to move the prefabricated segmental beam longitudinally, and then uses a segment lifting body and a beam-erecting crane to lift and lower the prefabricated segmental beam, thereby reducing the difficulty of lifting and lowering the prefabricated segmental beam and improving the installation efficiency.

[0017] (5) When installing the closed segment, the present invention first applies lateral pressure and tension to the first segment beam and the second segment beam through the support and compression bars and the supplementary tension bars, and simultaneously freezes and shrinks the first segment beam and the second segment beam through the external water cooling system and the internal freezing pipe, thereby reducing the difficulty of installing the closed segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a construction flow chart of the installation of prefabricated segmental beams using the short-line method of the present invention;

[0019] Figure 2 yes Figure 1 Cross-section view of the formwork support for the cast-in-place section of the pier top;

[0020] Figure 3 yes Figure 1 Longitudinal section of formwork support for cast-in-place section of pier top;

[0021] Figure 4 yes Figure 1 Construction structure drawing of prefabricated segmental beams hoisted by beam-erecting crane;

[0022] Figure 5 yes Figure 4 The structure diagram of the moving trolley for prefabricated segmental beams;

[0023] Figure 6 yes Figure 4 Structural diagram of the connection between the telescopic support beam and the fixed support beam;

[0024] Figure 7 yes Figure 4 The structural diagram of the connection between the mobile hanging plate and the crane top beam 73;

[0025] Figure 8 yes Figure 1 Closing segment installation structure drawing;

[0026] Fig. 9 yes Figure 8 Cross-sectional view of external water cooling system and internal freezing pipe layout.

[0027] In the figure: 1-precast segmental beam; 2-first segment matching beam; 3-intermediate segmental beam; 4-first segmental beam; 5-second segmental beam; 6-closed segment; 7-cast-in-place pier 7; 8-internal anchor bar; 9-internal anchor plate; 10-internal bolt; 11-lower layer clamp; 12-upper layer clamp; 13-lower layer support frame; 14-upper layer support frame; 15-support frame connector; 16-lower soil; 17-support trough plate, 18-connection cushion layer, 19-support box; 20-vertical support frame; 21-column top plate; 22-box-shaped support body; 23-vertical support bar; 24-cast-in-place section of pier top; 25-vertical adjustment Section body; 26- lateral adjustment body; 27- extension anchor bar; 28- inner mold height adjustment body; 29- inner bottom mold; 30- inner top mold; 31- side mold waterproof layer; 32- side mold reinforcement layer; 33- beam bottom support; 34- rotating support bar; 35- beam bottom template; 36- sliding support frame; 37- column top support groove; 38- height adjustment body; 39- moving roller; 40- lateral tension bar; 41- box bottom plate; 42- box top plate; 43- box side plate; 44- upper support bar; 45- lower support bar; 46- support bar connection hinge; 47- first ball hinge; 48- second ball hinge; 49- support column; 50- moving Moving channel; 51- beam moving trolley; 52- moving roller; 53- moving support groove; 54- segment lifting body; 55- support platform plate; 56- top support frame; 57- support frame bottom plate; 58- oblique tie bar; 59- support frame vertical plate; 60- beam bottom anchor plate; 61- beam crane; 62- crane column; 63- column side rail; 64- first winding machine; 65- first sling; 66- second winding machine; 67- second sling; 68- lateral limiter; 69- wing plate limiter groove; 70- crane bottom plate; 71- crane roller; 72- moving hanging plate; 73- crane top beam 73; 74- crane Plate roller; 75-limiting connecting plate; 76-telescopic support beam; 77-fixed support beam; 78-telescopic slide; 79-telescopic roller; 80-third winding machine; 81-third cable; 82-connecting falcon plate; 83-first support pier; 84-support pressure body; 85-ribbed end plate; 86-support rib; 87-third support pier; 88-transverse tension body; 89-supplementary rib; 90-circumferential water pipe; 91-longitudinal water pipe; 92-inner freezing pipe; 93-second support pier; 94-support pressure body; 95-fourth support pier; 96-ribbed pressure body; 97-ribbed end plate; 98-bottom support tube. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0029] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0030] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0031] like Figure 1-Figure 9 The present invention provides a construction method for a short-line prefabricated segmental beam installation system, such as Figure 1 As shown, the following steps are included:

[0032] Step 1, construction preparation: prefabricate the prefabricated segmental beam 1 in sections in the prefabrication yard according to the design requirements, the prefabricated segmental beam 1 includes the prefabrication of the first matching beam 2, the middle segmental beam 3, the first segmental beam 4, the second segmental beam 5 and the closing segment 6; cast the cast-in-place pier 7, and preset the internal anchor bar 8 in the cast-in-place pier 7; set the internal anchor plate 9 at the bottom end of the internal anchor bar 8, and set the internal bolt 10 near the top of the internal anchor bar 8 near the cast-in-place pier 7;

[0033] Step 2: Construction of cast-in-place section on pier top: on the top of the cast-in-place pier 7, lower hoop 11 and upper hoop 12 are sequentially arranged from bottom to top, and lower support frame 13 and upper support frame 14 are respectively arranged on the outer sides of lower support frame 11 and upper support frame 12, and a height-adjustable support frame connector 15 is arranged between the lower support frame 13 and the upper support frame 14, and the support frame connector 15 can be a telescopic rod; support trough plate 17, connection cushion layer 18, support box body 19 and vertical support frame 20 are sequentially arranged on the lower soil body 16 on both sides of the cast-in-place pier 7, and a box-shaped support body 22 is arranged on the column top plate 21 at the top of the vertical support frame 20, and a box-shaped support body 22 is arranged on the upper support frame 13. A vertical support bar 23 is provided on the upper surface of the support frame 14; a vertical adjustment body 25 and a horizontal adjustment body 26 are provided on the box-shaped support body 22 facing the cast-in-place section 24 of the pier top; first, the built-in anchor bar 8 is extended by extending the anchor bar 27, and an inner mold height adjustment body 28 is provided on the outer side of the built-in anchor bar 8, so that the lower surface and the upper surface of the inner mold height adjustment body 28 are respectively connected to the inner bottom mold 29 and the inner top mold 30, and a side mold waterproof layer 31 is provided between the two longitudinally opposite sides of the inner bottom mold 29 and the inner top mold 30, and a side mold reinforcement layer 32 is pasted on the outer side of the side mold waterproof layer 31; and a beam bottom support 33 is provided on the top of the cast-in-place pier 7, and then the vertical adjustment body 25 is provided. The top of the horizontal adjustment body 26 is hinged with the rotating brace 34, and the position and inclination angle of the rotating brace 34 are adjusted by the vertical adjustment body 25 and the horizontal adjustment body 26, and then the beam bottom template 35 is set on the upper surface of the rotating brace 34 and the vertical brace 23; firstly, a group of sliding brackets 36 are respectively set on both sides of the cast-in-place pier 7 along the longitudinal direction of the pier top cast-in-place section 24, and a height adjustment body 38 and a moving roller 39 are set in the column top support groove 37 at the top of the sliding bracket 36, and then the first section of the matching beam 2 is hoisted to the upper surface of the moving roller 39 by an external hoisting device, and then the two sides of the pier top cast-in-place section 24 are adjusted by the horizontal tension bars 40. The horizontal relative position of the first section matching beam 2 is adjusted, and the height of the first section matching beam 2 is controlled by the height adjustment body 38; the concrete of the pier top cast-in-place section 24 is poured by using external concrete pouring equipment; after the concrete of the pier top cast-in-place section 24 forms strength, a top support frame 56 is set on the top of the pier top cast-in-place section 24, and the support frame bottom plate 57 is firmly connected to the pier top cast-in-place section 24 by extending the anchor bar 27; one end of the oblique tie bar 58 is connected to the support frame vertical plate 59 on the support frame bottom plate 57, and the other end is connected to the beam bottom anchor plate 60 at the end of the first section matching beam 2, and a stable upward pulling force is applied to the first section matching beam 2 through the oblique tie bar 58;

[0034] Step 3: Moving the prefabricated segmental beam: according to the longitudinal direction of the bridge, a moving channel 50 is laid on the upper surface of the lower soil 16, and the moving roller 52 at the bottom of the beam moving trolley 51 can move along the moving channel 50; the beam moving trolley 51 includes a moving support groove 53, a segment lifting body 54 and a support platform plate 55, and the segment lifting body 54 is used to connect the moving support groove 53 and the support platform plate 55; firstly, the prefabricated segmental beam 1 is hoisted and placed in the support platform plate 55 by a hoisting device, and then the beam moving trolley 51 is moved along the moving channel 50 by an external rolling and pulling device;

[0035] Step 4, installation of prefabricated segmental beams: according to the plane size of the bridge, a beam erecting crane 61 is set on the lower soil body 16, and a column side rail 63 is set on the inner side of the crane column 62 of the beam erecting crane 61; starting from the cast-in-place pier 7, the intermediate segmental beam 3 is hoisted and placed step by step to the middle part of the bridge span; when the intermediate segmental beam 3 is hoisted and placed, the beam erecting crane 61 is first moved to the installation position of the intermediate segmental beam 3; then the intermediate segmental beam 3 is moved to the bottom of the beam erecting crane 61 by the beam shifting trolley 51, and the intermediate segmental beam 3 is lifted by the segment lifting body 54, and then the supporting platform plate 55 together with the intermediate segmental beam 3 is hoisted to the set height by the first winding machine 64 and the first sling 65 on the lower surface of the mobile hanging plate 72, and the mobile hanging plate 72 is moved and set on the beam erecting crane 61, and the bottom of the mobile hanging plate 72 is connected to the first winding machine 64, and A second winding machine 66 is provided on the upper surface of the movable hanging plate 72, so that the second winding machine 66 is connected to the movable hanging plate 72 through the second cable 67, and the height of the movable hanging plate 72 and the first winding machine 64 is adjusted by the second winding machine 66 and the second cable 67, thereby preliminarily adjusting the height of the intermediate segment beam 3, and then adjusting the height of the fixed support beam 77 and the telescopic support beam 76 by the third winding machine 80 and the third cable 81 located on the inner side of the crane column 62, and the lateral limiting body 68 is mirror-imaged to the lower part of the two telescopic support beams 76 on the inner side of the crane column 62, and the end of the lateral limiting body 68 is connected to one side of the telescopic support beam 76, and the lateral limiting body 68 can adopt a telescopic rod, so that when the lateral limiting body 68 is extended and retracted, the lateral position of the wing plate limiting groove 69 on the telescopic support beam 76 is adjusted, thereby limiting the spatial position of the intermediate segment beam 3;

[0036] The wing plate limiting groove 69 can be snap-connected to the wing plate on the side of the middle segment beam 3 , so that the wing plate limiting groove 69 can position the middle segment beam 3 .

[0037] Step 5, closing the prefabricated segmental beams: a sliding support frame 36 is set at the lower part of the first segmental beam 4 and the second segmental beam 5 on both sides of the closing segment 6, and a column top support groove 37 is set at the top of the sliding support frame 36, and a movable roller 39 and a height adjustment body 38 are set in the column top support groove 37; a first support pier 83 and a supporting pressure body 84 are respectively set on the first segmental beam 4 and the second segmental beam 5, and the end of the supporting pressure body 84 is connected to the rib end plate 85, and a supporting rib 86 is set between the first support pier 83 and the rib end plate 85, and the supporting pressure body 84 can adopt a hydraulic rod to stretch the supporting rib 86 when the supporting pressure body 84 is lifted; a third support pier 83 is respectively set on the first segmental beam 4 and the prefabricated segmental beam 1 connected thereto 7 and a transverse tie body 88, and a supplementary tie rod 89 is arranged between the third support pier 87 and the transverse tie body 88; an external water cooling system consisting of an annular water pipe 90 and a longitudinal water pipe 91 is respectively arranged on the outer periphery of the first segment beam 4 and the second segment beam 5, and an internal freezing pipe 92 is respectively arranged in the cavity of the first segment beam 4 and the second segment beam 5; firstly, the first segment beam 4 and the second segment beam 5 are cooled synchronously by the external water cooling system and the internal freezing pipe 92, and a transverse tension is applied to the first segment beam 4 and the second segment beam 5 by the supporting pressure body 84 and the supplementary tie rod 89, and then the internal freezing pipe 92 is removed, and then the beam erection crane 61 is used to lift the closed segment 6 to between the first segment beam 4 and the second segment beam 5 for overlap.

[0038] Figure 2 yes Figure 1 Cross-section diagram of the formwork support for the cast-in-place section of the pier top. Figure 3 yes Figure 1 Longitudinal section of the formwork support for the cast-in-place section of the pier top. Figure 4 yes Figure 1 Construction structure diagram of prefabricated segmental beams hoisted by beam erecting crane. Figure 5 yes Figure 4 Prefabricated segmental beam moving trolley moving structure diagram, Figure 6 yes Figure 4 The structural diagram of the connection between the telescopic support beam and the fixed support beam. Figure 7 yes Figure 4 The structural diagram of the connection between the mobile hanging plate and the crane top beam 73, Figure 8 yes Figure 1 Closing segment installation structure diagram, Fig. 9 yes Figure 8 Cross-sectional view of external water cooling system and internal freezing pipe layout. Figure 2 to Figure 9 As shown, the short-line method of prefabricated segmental beam installation construction is implemented as follows.

[0039] The precast segmental beam 1 is precast in a precast yard, and the concrete strength grade is C50, including a first segment matching beam 2, an intermediate segment beam 3, a first segment beam 4, a second segment beam 5 and a closed segment 6 with the same concrete strength and segment size.

[0040] The cast-in-place pier 7 is made of reinforced concrete with a concrete strength grade of C50 during pouring construction, and a built-in anchor bar 8 is preset in the cast-in-place pier 7; the built-in anchor bar 8 is rolled from threaded steel bars with a diameter of 32 mm, and a thread connected to the built-in bolt 10 is arranged at the top; a built-in anchor plate 9 is arranged at the bottom of the built-in anchor bar 8, and the built-in anchor plate 9 is made of a steel plate with a thickness of 20 mm, a plane size of 30×30 cm, and a strength grade of Q235.

[0041] A lower hoop 11 and an upper hoop 12 are arranged on the top of the cast-in-place pier 7 from bottom to top. The lower hoop 11 and the upper hoop 12 are both made of rolled steel plates with a width of 10 cm, and include two hoop plates of the same shape. A lower support frame 13 and an upper support frame 14 are welded on the outer sides of the lower hoop 11 and the upper hoop 12, respectively. The lower support frame 13 and the upper support frame 14 are both made of rolled steel plates. A height-adjustable support frame connector 15 is arranged between the lower support frame 13 and the upper support frame 14. The support frame connector 15 uses height-adjustable bolts with a screw diameter of 60 mm.

[0042] The lower soil 16 on both sides of the cast-in-place pier 7 is hard plastic clay. A support trough 17, a connection cushion 18, a support box 19 and a vertical support frame 20 are arranged in sequence on the lower soil 16; the support trough 17 is made of a 10mm thick steel plate, with a plane size of 3×3m and a "U" shape in cross section; the connection cushion 18 is made of dense graded medium-coarse sand; the support box 19 is made of a 10mm thick steel plate, in a prism shape, and includes a box bottom plate 41, a box top plate 42 and a box side plate 43. The bottom width is 2.5m and the height is 20cm. The cavity is filled with Medium-coarse sand is used to make the box side plate 43 be arranged in a regular figure eight shape; the vertical support frame 20 includes a support column 49 and a column top plate 21, and the bottom end of the support column 49 is inserted into the bottom support tube 98 of the support box 19, the support column 49 is made of a steel section or steel pipe with a diameter of 300mm, and the column top plate 21 is made of a steel plate with a thickness of 20mm; a box-shaped support body 22 is set on the column top plate 21 at the top of the vertical support frame 20, and the cross-section of the box-shaped support body 22 is rectangular or trapezoidal, and is made of a steel plate with a thickness of 20mm;

[0043] Vertical bracing bars 23 are arranged on the upper surface of the upper support frame 14, and the vertical bracing bars 23 are rolled from steel pipes with a diameter of 300 mm; a vertical adjusting body 25 and a transverse adjusting body 26 are welded on the box-shaped support body 22 facing the pier top cast-in-place section 24, and both the vertical adjusting body 25 and the transverse adjusting body 26 use hydraulic jacks, and a first ball joint 47 and a second ball joint 48 are respectively arranged on the top; the first ball joint 47 and the second ball joint 48 both use ball hinges.

[0044] The extended anchor bar 27 is made of 32mm diameter threaded steel bar rolled, and the internal anchor bar 8 is extended by the extended anchor bar 27. An inner mold height adjustment body 28 is set on the outside of the internal anchor bar 8. The inner mold height adjustment body 28 uses a hydraulic jack to make the lower surface and upper surface of the inner mold height adjustment body 28 connected to the inner bottom mold 29 and the inner top mold 30 respectively. The inner bottom mold 29 and the inner top mold 30 are both made of 4mm thick steel plates. A side mold waterproof layer 31 is set between the two longitudinally opposite sides of the inner bottom mold 29 and the inner top mold 30. The side mold waterproof layer 31 uses a rubber sheet with a thickness of 1mm; a side mold reinforcement layer 32 is pasted on the outside of the side mold waterproof layer 31. The side mold reinforcement layer 32 uses a glass fiber grid layer; a beam bottom support 33 is set at the top of the cast-in-place bridge pier 7. The beam bottom support 33 uses a rubber shock-absorbing support. The top ends of the vertical adjustment body 25 and the lateral adjustment body 26 are hinged with the rotating support rib 34. The rotating support rib 34 includes an upper support rib 44 and a lower support rib 45, both of which are made of a 10 mm thick steel plate. A support rib connecting hinge 46 is provided between the upper support rib 44 and the lower support rib 45, so that the upper support rib 44 is connected to the vertical adjustment body 25 through a first ball hinge 47, and the lower support rib 45 is connected to the lateral adjustment body 26 through a second ball hinge 48.

[0045] A beam bottom template 35 is arranged on the upper surface of the rotating bracing bars 34 and the vertical bracing bars 23 , and the beam bottom template 35 is made of a steel plate with a thickness of 4 mm.

[0046] A group of sliding supports 36 are respectively arranged on both sides of the cast-in-place pier 7 along the longitudinal direction of the cast-in-place section 24 of the pier top. The structure of the sliding support frame 36 is the same as that of the vertical support frame 20. A height adjustment body 38 and a movable roller 39 are arranged in the column top support groove 37 at the top of the sliding support frame 36. The column top support groove 37 is rolled from a steel plate with a thickness of 10 mm and has a "U" shape in cross section; the height adjustment body 38 adopts a hydraulic jack for adjusting the height; the movable roller 39 is rolled from a steel pipe with a diameter of 200 cm.

[0047] External concrete pouring equipment is used to pour concrete for the pier top cast-in-place section 24, and the concrete strength grade is C50. After the concrete of the pier top cast-in-place section 24 has formed strength, a top support frame 56 is set on the top of the pier top cast-in-place section 24. The top support frame 56 includes a support frame bottom plate 57 and two support frame vertical plates 59, all of which are rolled from steel plates with a thickness of 20 mm, and the support frame vertical plates 59 are vertically welded to the support frame bottom plate 57.

[0048] The oblique tie rod 58 is rolled with a screw rod with a diameter of 30 mm, and one end of the oblique tie rod 58 is connected to the support plate 59, and the other end is fastened to the hole on the bottom anchor plate 60 at the end of the first section matching beam 2 through a nut. The bottom anchor plate 60 is rolled with a steel plate with a thickness of 20 mm and has an "L" shape in cross section.

[0049] According to the longitudinal direction of the bridge, a movable channel 50 is laid on the upper surface of the lower soil 16. The movable channel 50 is rolled from a steel plate with a thickness of 10 mm, with a "U"-shaped cross section and a width of 20 cm. The beam-shifting trolley 51 consists of a movable support groove 53, a segment lifting body 54 and a support platform plate 55; the movable support groove 53 is rolled from a steel plate with a thickness of 20 mm, with a "U"-shaped cross section; the segment lifting body 54 uses a hydraulic jack with a stroke of 1 m, and the bottom and top ends are welded to the movable support groove 53 and the support platform plate 55 respectively; the support platform plate 55 is rolled from a steel plate with a thickness of 20 mm, with a "U"-shaped cross section.

[0050] The beam erecting crane 61 includes four crane columns 62, which are rolled from steel plates with a thickness of 30 mm. A crane top beam 73 is arranged at the top of the mirror-opposite crane columns 62, which are rolled from steel plates with a thickness of 30 mm; a crane bottom plate 70 and a crane roller 71 are arranged at the bottom of the crane columns 62, which are rolled from steel plates with a thickness of 30 mm; the crane roller 71 uses a 60 mm steel wheel of the bracket.

[0051] According to the plane size of the bridge, a beam erecting crane 61 is arranged on the lower soil body 16, and a column side rail 63 is arranged on the inner side of the crane column 62 of the beam erecting crane 61; the column side rail 63 is arranged on the inner side surface of the crane column 62, and the cross section is T-shaped, and a limiting connecting plate 75 is arranged inside the column side rail 63; the limiting connecting plate 75 is made of rolled steel plate with a thickness of 30 mm, and is vertically welded to the fixed support beam 77.

[0052] During the construction of the intermediate segment beam 3 being hoisted, the beam erecting crane 61 is first moved to the installation position of the intermediate segment beam 3; the intermediate segment beam 3 is then moved to the bottom of the beam erecting crane 61 by the beam shifting trolley 51, and the intermediate segment beam 3 is lifted by the segment lifting body 54, and then the supporting platform plate 55 together with the intermediate segment beam 3 is hoisted to the set height by the first winding machine 64 and the first sling 65 on the lower surface of the mobile hanging plate 72. The first winding machine 64 adopts a wire rope winch; the first sling 65 adopts a wire rope with a diameter of 30 mm. The mobile hanging plate 72 is made of a rolled steel plate with a thickness of 30 mm and a T-shaped cross section. Two groups of first winding machines 64 are arranged on the lower surface. After the top extends out of the crane top beam 73, a hanging plate roller 74 connected to the crane top beam 73 is arranged. The hanging plate roller 74 adopts a steel wheel with a diameter of 10 cm.

[0053] The height of the middle segment beam 3 is preliminarily adjusted by the second winding machine 66 and the second cable 67. The second winding machine 66 adopts a wire rope winch; the second cable 67 adopts a wire rope with a diameter of 30 mm.

[0054] The third winding machine 80 is disposed on the upper part of the column side rail 63 and is connected to the upper surface of the fixed support beam 77 through the third cable 81. The height of the fixed support beam 77 and the telescopic support beam 76 are adjusted by the third winding machine 80 and the third cable 81. The third winding machine 80 adopts a wire rope winch; the third cable 81 adopts a wire rope with a diameter of 30 mm.

[0055] The fixed support beam 77 and the telescopic support beam 76 are both rolled from a steel plate with a thickness of 10 mm, and the telescopic support beam 76 is connected to the fixed support beam 77 through a telescopic slide groove 78 and a telescopic roller 79. The cross-section of the telescopic support beam 76 is in the shape of an "I" character, and a connecting falcon plate 82 is arranged on the lower surface of the telescopic support beam 76; the fixed support beams 77 are arranged in pairs on both sides of the telescopic support beam 76, and one end is vertically welded to the limiting connecting plate 75; the connecting falcon plate 82 is rolled from a steel plate with a thickness of 20 mm; a wing plate limiting groove 69 is arranged at the air-facing end of the telescopic support beam 76, and the size of the wing plate limiting groove 69 is the same as the shape of the wing plate end of the prefabricated segment beam 1.

[0056] The lateral limiter 68 adopts a hydraulic jack, is vertically welded to the inner side of the crane column 62, and is connected to the connecting plate 82 on the lower surface of the telescopic support beam 76. The connecting plate 82 is made of a steel plate with a thickness of 20 mm.

[0057] A first support pier 83 and a support pressure body 84 are respectively provided on the first segment beam 4 and the second segment beam 55, and a support pressure rib 86 is provided between the first support pier 83 and the pressure rib end plate 85; the first support pier 83 is made of a steel plate with a thickness of 20 mm; the support pressure body 84 includes a second support pier 93 and a support pressure body 94 arranged in pairs, the support pressure body 94 is arranged between the second support pier 92 and the pressure rib end plate 85, and the support pressure body 94 adopts a hydraulic jack; the second support pier 93 is made of a steel plate with a thickness of 20 mm; the support pressure body 94 adopts a hydraulic jack; the pressure rib end plate 85 is made of a steel plate with a thickness of 20 mm. The support pressure rib 86 is made of H-shaped steel or steel pipe with a specification of 350×350×12×19.

[0058] A third support pier 87 and a transverse tie 88 are respectively arranged on the first segment beam 4 and the prefabricated segment beam 1 connected thereto, and a supplementary tie 89 is arranged between the third support pier 87 and the transverse tie 88; the third support pier 87 is made of a steel plate with a thickness of 20 mm; the transverse tie 88 includes a fourth support pier 95 and a tie pressure body 96 arranged in pairs, and the tie pressure body 96 is arranged between the fourth support pier 95 and the tie end plate 97; the first support pier 83, the second support pier 93, the third support pier 87 and the fourth support pier 95 are anchored to the outer side of the prefabricated segment beam 1; the fourth support pier 95 is made of a steel plate with a thickness of 20 mm; the tie pressure body 96 is a hydraulic jack; the tie end plate 97 is made of a steel plate with a thickness of 20 mm. The supplementary tie 89 is made of H-shaped steel or steel pipe with a specification of 350×350×12×19.

[0059] An external water cooling system consisting of an annular water pipe 90 and a longitudinal water pipe 91 is respectively arranged on the outer periphery of the first segment beam 4 and the second segment beam 5, and an internal freezing pipe 92 is respectively arranged in the cavity of the first segment beam 4 and the second segment beam 5; the annular water pipe 90, the longitudinal water pipe 91 and the internal freezing pipe 92 are all made of aluminum alloy pipes, steel pipes or plastic pipes with a diameter of 90 mm, and are connected to the external water cooling system; the circulating cold water temperature is -5 to -10°C.

[0060] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. The construction method of the short-line prefabricated segmental beam installation system is characterized in that: The following steps are involved: Step 1, construction preparation: prefabricate the prefabricated segmental beam (1) in sections, wherein the prefabricated segmental beam (1) includes a first matching beam (2), an intermediate segmental beam (3), a first segmental beam (4), a second segmental beam (5) and a closed segment (6); cast-in-place bridge piers (7) are cast, and internal anchor bars (8) are preset in the cast-in-place bridge piers (7); internal anchor plates (9) are arranged at the bottom ends of the internal anchor bars (8), and internal bolts (10) are arranged near the top ends of the internal anchor bars (8) and the cast-in-place bridge piers (7); Step 2: Construction of the cast-in-place section on the pier top: a lower hoop (11) and an upper hoop (12) are sequentially arranged on the top of the cast-in-place pier (7) from bottom to top, and a lower support frame (13) and an upper support frame (14) are respectively arranged on the outer sides of the lower hoop (11) and the upper hoop (12), and a height-adjustable support frame connector (15) is arranged between the lower support frame (13) and the upper support frame (14); a support trough plate (17), a connection cushion layer (18), a support box (19) and a vertical support frame (20) are sequentially arranged on the lower soil (16) on both sides of the cast-in-place pier (7). ); pouring concrete for the pier top cast-in-place section (24); after the concrete for the pier top cast-in-place section (24) has formed strength, setting a top support frame (56) on the top of the pier top cast-in-place section (24); and firmly connecting the support frame bottom plate (57) and the pier top cast-in-place section (24) by extending the anchor bar (27); connecting one end of the oblique tie bar (58) to the support frame vertical plate (59) on the support frame bottom plate (57), and connecting the other end to the beam bottom anchor plate (60) at the end of the first section matching beam (2); applying a stable upward pulling force to the first section matching beam (2) through the oblique tie bar (58); Step 3: moving the prefabricated segmental beam: laying a moving channel (50) on the upper surface of the lower soil (16), and enabling the moving rollers (52) at the bottom of the beam moving trolley (51) to move along the moving channel (50); the beam moving trolley (51) comprises a moving support groove (53), a segment lifting body (54) and a support platform plate (55), wherein the segment lifting body (54) is used to connect the moving support groove (53) and the support platform plate (55); the prefabricated segmental beam (1) is hoisted into the support platform plate (55), and then the beam moving trolley (51) is moved along the moving channel (50); Step 4, installation of prefabricated segmental beams: a beam erecting crane (61) is arranged on the lower soil (16), and a column side rail (63) is arranged on the inner side of the crane column (62) of the beam erecting crane (61); starting from the cast-in-place bridge pier (7), the intermediate segmental beam (3) is hoisted and lowered step by step to the middle part of the bridge span; when the intermediate segmental beam (3) is hoisted and lowered, the beam erecting crane (61) is first moved to the installation position of the intermediate segmental beam (3); then the intermediate segmental beam (3) is moved to the bottom of the beam erecting crane (61) by the beam moving trolley (51), and the intermediate segmental beam (3) is lifted by the segment lifting body (54), and then the support platform plate (55) together with the intermediate segmental beam (3) is lifted to a set height by the first winding machine (64) and the first sling (65) on the lower surface of the mobile hanging plate (72); Step 5, closing the prefabricated segmental beams: a sliding support frame (36) is arranged at the lower part of the first segmental beam (4) and the second segmental beam (5) on both sides of the closing segment (6); a beam erecting crane (61) is used to lift the closing segment (6) between the first segmental beam (4) and the second segmental beam (5) for overlapping.

2. The construction method of the short-line prefabricated segmental beam installation system according to claim 1 is characterized by: In step 2, a box-shaped support body (22) is arranged on the column top plate (21) at the top of the vertical support frame (20), and a vertical support rib (23) is arranged on the upper surface of the upper support frame (14); a vertical adjustment body (25) and a horizontal adjustment body (26) are arranged on the box-shaped support body (22) facing the pier top cast-in-place section (24); first, the built-in anchor rib (8) is extended by extending the anchor rib (27), and an inner mold height adjustment body (28) is arranged on the outer side of the built-in anchor rib (8), so that the lower surface and the upper surface of the inner mold height adjustment body (28) are respectively connected to the inner bottom mold (29) and the inner top mold (30), and a side mold waterproof layer (31) is arranged between the two longitudinally opposite sides of the inner bottom mold (29) and the inner top mold (30), and a side mold reinforcement layer (32) is pasted on the outer side of the side mold waterproof layer (31).

3. The construction method of the short-line prefabricated segmental beam installation system according to claim 1 is characterized by: In step 2, a beam bottom support (33) is arranged at the top of the cast-in-place bridge pier (7), and then the top of the vertical adjustment body (25) and the horizontal adjustment body (26) are hinged with the rotating brace (34), and the position and inclination angle of the rotating brace (34) are adjusted by the vertical adjustment body (25) and the horizontal adjustment body (26), and then a beam bottom template (35) is arranged on the upper surface of the rotating brace (34) and the vertical brace (23); first, the cast-in-place bridge pier is formed along the longitudinal direction of the cast-in-place section (24) at the top of the pier, and then the cast-in-place bridge pier is formed. A set of sliding supports (36) are respectively arranged on both sides of (7), and a height adjustment body (38) and a movable roller (39) are arranged in the column top support groove (37) at the top of the sliding support frame (36), and then the first section matching beam (2) is suspended on the upper surface of the movable roller (39), and then the lateral relative position of the first section matching beam (2) on both sides of the pier top cast-in-place section (24) is adjusted by transverse tension bars (40), and then the height of the first section matching beam (2) is controlled by the height adjustment body (38).

4. The construction method of the short-line prefabricated segmental beam installation system according to claim 1 is characterized by: In step 4, a movable hanging plate (72) is moved and set on the beam erecting crane (61), the bottom of the movable hanging plate (72) is connected to the first winding machine (64), and a second winding machine (66) is set on the upper surface of the movable hanging plate (72), so that the second winding machine (66) is connected to the movable hanging plate (72) through the second cable (67), and the height of the movable hanging plate (72) and the first winding machine (64) is adjusted by the second winding machine (66) and the second cable (67), and then the movable hanging plate (72) and the first winding machine (64) are adjusted by the second winding machine (66) and the second cable (67). The third winding machine (80) and the third cable (81) on the side adjust the height of the fixed support beam (77) and the telescopic support beam (76); the lateral limiting body (68) is mirror-imaged and arranged at the lower part of the two telescopic support beams (76) on the inner side of the crane column (62); and the end of the lateral limiting body (68) is connected to one side of the telescopic support beam (76); the lateral limiting body (68) can adopt a telescopic rod to adjust the lateral position of the wing plate limiting groove (69) on the telescopic support beam (76) when the lateral limiting body (68) is extended or retracted.

5. The construction method of the short-line prefabricated segmental beam installation system according to claim 1 is characterized by: In step five, a first support pier (83) and a supporting pressure body (84) are respectively arranged on the first segment beam (4) and the second segment beam (5), the end of the supporting pressure body (84) is connected to the rib end plate (85), and a supporting rib (86) is arranged between the first support pier (83) and the rib end plate (85) so that the supporting rib (86) is stretched when the supporting pressure body (84) is lifted; a third support pier (87) and a transverse tie body (88) are respectively arranged on the first segment beam (4) and the prefabricated segment beam (1) connected thereto, and a supplementary tie bar (89) is arranged between the third support pier (87) and the transverse tie body (88); and a transverse tension is applied to the first segment beam (4) and the second segment beam (5) through the supporting pressure body (84) and the supplementary tie bar (89).

6. The construction method of the short-line prefabricated segmental beam installation system according to claim 1 is characterized by: In step five, an external water cooling system consisting of an annular water pipe (90) and a longitudinal water pipe (91) is respectively arranged on the outer periphery of the first segment beam (4) and the second segment beam (5), and an internal freezing pipe (92) is respectively arranged in the cavity of the first segment beam (4) and the second segment beam (5); the first segment beam (4) and the second segment beam (5) are cooled synchronously by the external water cooling system and the internal freezing pipe (92).

7. The construction method of the short-line prefabricated segmental beam installation system according to claim 3 is characterized by: The rotating support rib (34) comprises an upper support rib (44) and a lower support rib (45), and a support rib connecting hinge (46) is provided between the upper support rib (44) and the lower support rib (45), so that the upper support rib (44) is connected to the vertical adjustment body (25) through a first ball joint (47), and the lower support rib (45) is connected to the horizontal adjustment body (26) through a second ball joint (48).

8. The construction method of the short-line prefabricated segmental beam installation system according to claim 3 is characterized by: The vertical support frame (20) and the sliding support frame (36) have the same structure, both including a supporting column (49) and a column top plate (21), and the bottom end of the supporting column (49) is inserted into the bottom support tube (98) of the supporting box (19); the top support frame (56) includes a support frame bottom plate (57) and a support frame vertical plate (59), and the support frame vertical plate (59) is vertically connected to the support frame bottom plate (57).

9. The construction method of the short-line prefabricated segmental beam installation system according to claim 1 is characterized by: A crane top beam (73) is arranged at the top of the crane column (62), and a crane bottom plate (70) and a crane roller (71) are arranged at the bottom of the crane column (62).

10. A short-line prefabricated segmental beam installation system, characterized in that: It is obtained by the construction method of the short-line prefabricated segmental beam installation system according to any one of claims 1-9.

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