Construction method and component mold of split type prefabricated concrete cover beam

Abstract

The invention discloses a construction method of a split type precast concrete cover beam and a component mold thereof, a combined component mold is formed by a bottom mold, a side mold, a first side mold and a second side mold, a component I and a component II are manufactured by using the mold, and then the component I and the component II are assembled and cast in situ on site to form the split type precast concrete cover beam. The large-cantilever prefabricated cover beam can be manufactured under the special working conditions that the construction site is narrow, the distance between supporting stand columns is small, cantilevers on the two sides are large, and the stress requirement is high, and due to the fact that the prefabricated concrete cover beam is heavy and large in transportation difficulty, the transportation and hoisting difficulty is reduced by manufacturing the first component and the second component in a split mode; the manufacturing difficulty of the prefabricated concrete cover beam is reduced, meanwhile, the prefabricated concrete cover beam with the larger size and weight can be manufactured, and the requirements for the prefabricated concrete cover beam in different projects are effectively met.

Description

Technical Field

[0001] The invention relates to the technical field of urban elevated cap beam manufacturing, and in particular to a construction method of a segmented prefabricated concrete cap beam and a component mold thereof. Background Art

[0002] With the rapid development of urban elevated prefabrication technology, urban elevated roads are mostly prefabricated in factories and then assembled on site, which can effectively improve the construction speed of urban elevated roads and the level of on-site construction civilization. However, with the increasing complexity of construction conditions, traditional integral or segmented prefabricated cap beam technology cannot meet the actual needs of some specific projects. The segmented cap beam can effectively meet the overall force needs of the large cantilevers at both ends of the cap beam, but its related efficient production and manufacturing technology is still lacking. Summary of the invention

[0003] In view of this, the present invention provides a construction method of a segmented precast concrete cap beam and a component mold thereof, so as to solve the technical problems existing in the above-mentioned background technology.

[0004] A piece-type precast concrete cap beam component mold, the piece-type precast concrete cap beam comprises a component 1, a component 2, and a post-cast strip formed in a casting cavity between the component 1 and the component 2, the component mold comprises a bottom mold, end molds arranged at both ends of the bottom mold, and a first side mold and a second side mold arranged at both sides of the bottom mold, the bottom mold and the end mold, the first side mold and the second side mold together enclose a casting area for casting the component 1 or the component 2;

[0005] The structures of the bottom mold, end mold and second side mold used for casting component one are the same as those of the bottom mold, end mold and second side mold used for casting component two.

[0006] The first side mold used for casting component one comprises a first mold frame and a first side plate fixed on the inner side of the first mold frame, wherein two ends of the first mold frame are formed with bending parts, the end mold is fixed on the bending parts and a first gap is formed between the inner side surface of the end mold and the folded surface of the bending part so that the inner side of the end of component one forms a first outer blade plate, the bottom surface shape of the first side plate matches the top surface shape of the bottom mold and a second gap is formed between the bottom edge of the first side plate and the top surface of the bottom mold so that the inner side of the bottom surface of component one forms a second outer blade plate, and the first side plate is provided with a positioning hole for passing a transverse prestressed tendon;

[0007] The first side form used for casting component two includes a second formwork frame and a second side plate fixed on the inner side of the second formwork frame. The inner side surface of the end formwork contacts the end of the second formwork frame, the bottom edge of the second side plate contacts the top surface of the bottom formwork, and the second side plate is also provided with positioning holes for passing transverse prestressed tendons.

[0008] Preferably, the structure of the second formwork is the same as that of the first formwork, both comprising a steel frame and a side formwork fixed on the inner side of the steel frame.

[0009] Preferably, the bottom mold includes a bottom mold plate and a plurality of bottom mold pillars fixed to the bottom of the bottom mold plate, and the shape of the bottom mold plate matches the bottom surface shape of component one and component two.

[0010] Preferably, the shape of the inner side surface of the second side mold matches the shape of the outer side surfaces of component one and component two.

[0011] A construction method for a segmented precast concrete cap beam specifically comprises the following steps:

[0012] S1, using the bottom mold, the end mold, the first side mold used for the component one and the second side mold to form a component mold, and manufacturing the component one in the factory. After the component one is manufactured, the first side mold used for the component one is replaced with the first side mold used for the component two, and the component two is manufactured, and the pile foundation, the abutment and the bridge pier column are constructed simultaneously;

[0013] The manufactured components 1 and 2 both have transverse prestressed steel strands and longitudinal prestressed steel strands, and the first outer blades are formed on the inner sides of the two ends of the component 1, and the second outer blade is formed on the inner side of the bottom surface;

[0014] After the components 1 and 2 are manufactured, the first batch of longitudinal prestressed steel strands on the components 1 and 2 are tensioned;

[0015] S2, hoisting components 1 and 2 onto the pier columns;

[0016] S3, connecting the transverse prestressed steel strands of the first component with the transverse prestressed steel strands of the second component through the joint steel bars, and then pouring ultra-high performance concrete into the casting cavity between the first component and the second component, and completing the post-casting of the support pad stone and the block concrete at the same time;

[0017] S4, after the strength of the ultra-high performance concrete in the casting cavity between the first component and the second component reaches 100% of the design strength, tensioning the second batch of longitudinal prestressed steel strands on the first component and the second component;

[0018] S5, tensioning the transverse prestressed steel strands on the first and second components, then installing the prefabricated box girder and tensioning the third batch of longitudinal prestressed steel strands on the first and second components;

[0019] S6, bridge deck construction, completed bridge.

[0020] Preferably, the manufacturing methods of component 1 and component 2 in step S1 are the same, and both include the steps of:

[0021] S11, placing the bottom form on a flat ground, setting a positioning plate at the center of the bottom form, and setting a grouting sleeve on the positioning plate;

[0022] S12, hanging the tied steel cage on the bottom formwork, and inserting a longitudinal prestressed corrugated pipe in the steel cage;

[0023] S13, setting the first side mold and the second side mold on both sides of the bottom mold, and setting the end mold at both ends of the bottom mold, so that the bottom mold, the end mold, the first side mold and the second side mold together form a casting area;

[0024] S14, inserting a transverse prestressed corrugated pipe into the positioning hole of the first side form, wherein one end of the prestressed corrugated pipe extends into the steel cage and the other end is exposed outside the first side form;

[0025] S15, pouring ultra-high performance concrete in the pouring area, and performing a curing treatment on the formed component after the concrete solidifies;

[0026] S16, prestressed steel strands are inserted into longitudinal and transverse prestressed corrugated pipes;

[0027] S17, demoulding of the component.

[0028] Preferably, the specific steps of demoulding the component in step S17 are:

[0029] Remove the end mold first, then remove the second side mold;

[0030] Then, destroy the side plate of the first side mold;

[0031] Finally, remove the formwork of the first side form.

[0032] Preferably, the specific steps of hoisting the component 1 and the component 2 on the pier column in step S2 are:

[0033] First, pre-assemble component one and component two;

[0034] Then, the first component and the second component are transported to the viaduct construction site and hoisted onto the pier columns respectively, and the first outer blade plate and the second outer blade plate of the first component are abutted against the inner side surface of the second component;

[0035] Then, grouting is injected into the grouting sleeves of component one and component two to connect component one and component two with the pier column.

[0036] Preferably, the specific steps of pre-assembling component one and component two are:

[0037] Fix component one and lift component two to make it fit with component one;

[0038] When component two moves to be in contact with component one, fix one end of component two on the ground and slowly lower the other end. During the process when the other end of component two slowly lowers to touch the ground steadily, observe whether the transverse prestressed steel strands on component two and the transverse prestressed steel strands on component one will collide or interfere with each other. If no collision or interference occurs, the pre-assembly of component one and component two is completed. Otherwise, the transverse prestressed steel strands on component one or component two are adjusted.

[0039] Preferably, each time the prestressed steel strands are tensioned, they are tensioned symmetrically, and initial stress is applied first, and then the tensioning force is gradually increased to the design value and maintained for a set time before grouting and anchor sealing.

[0040] The beneficial effects of the present invention are:

[0041] 1. The present invention forms a combined component mold through a bottom mold, a side mold, a first side mold and a second side mold, uses the mold to manufacture component one and component two, and then assembles component one and component two on site and casts them into piece-type precast concrete cap beams. It can realize the manufacture of large cantilever precast cap beams under special working conditions such as narrow construction sites, small support column spacing, large cantilevers on both sides, and high force requirements. In addition, since the precast concrete cap beam is heavy and difficult to transport, the difficulty of transportation and hoisting is reduced by manufacturing component one and component two in pieces, and the difficulty of manufacturing the precast concrete cap beam is reduced. At the same time, it can also realize the manufacture of precast concrete cap beams of larger size and weight, effectively meeting the requirements for precast concrete cap beams in different projects.

[0042] 2. The construction method of the precast concrete cap beam of the present invention can effectively improve the production efficiency and production accuracy of the components, and can be assembled on the ground or at low altitude, reducing the time of high-altitude operations. At the same time, the construction method of the segmented cap beam can save a large amount of auxiliary materials such as formwork and scaffolding, thereby reducing construction costs and reducing construction risks.

[0043] 3. The segmented cap beam can flexibly adapt to different terrains and construction conditions, especially in sites with complex terrain or limited space, the construction of the segmented cap beam is more convenient. At the same time, the construction process of the segmented cap beam reduces the noise, dust, wastewater and other pollutants generated during on-site pouring and maintenance, which helps to reduce the negative impact of construction on the surrounding environment and residents, and is in line with the concept of modern green buildings.

[0044] 4. The precast concrete cap beam of the present invention is divided into three parts in the longitudinal direction, namely component one, component two and post-cast strip. Component one and component two are made separately and prestressed tendons are reserved. Component one and component two are connected and displaced by cast-in-place concrete after being assembled on site. Compared with the segmented precast concrete cap beam, it can achieve greater cantilever stress and has a wider range of usage scenarios. And because the two ends and the bottom of component one are reserved with outer blades, after component one and component two are spliced ​​and assembled, the outer blade on component one can be used as the side mold for the subsequent pouring of the post-cast strip and form a casting cavity with one side of component two, which reduces the formwork work at the construction site and also enhances the structural integrity and consistency of the precast concrete cap beam.

[0045] 5. The first side formwork used for component one and component two is composed of a steel frame structure and a wooden formwork. The steel frame structure can support the overall shape of the component, while the wooden formwork can achieve precise positioning of the exposed transverse prestressed tendons. The exposed transverse prestressed tendons on component one and component two are all L-shaped steel bars, which can greatly reduce the difficulty of post-penetration of the longitudinally laid joint steel bars in the middle cast-in-place post-cast strip.

[0046] 6. The bottom mold, end mold and second side mold used in component one and component two are the same, and only the structure of the first side mold is slightly different. After component one is completed, it is only necessary to replace the first side mold of component one with the first side mold of component two. The existing bottom mold, end mold and second side mold can be reused, which greatly reduces the mold production cost and reduces the company's construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 It is a structural schematic diagram of a segmented precast concrete cap beam.

[0049] Figure 2 It is a side view of the segmented precast concrete cap beam.

[0050] Figure 3 It is a structural schematic diagram of component one of the segmented precast concrete cap beam.

[0051] Figure 4 It is a structural schematic diagram of component two that constitutes a segmented precast concrete cap beam.

[0052] Figure 5 It is a structural schematic diagram of a component mold for manufacturing component one or component two.

[0053] Figure 6 It is a structural diagram of the bottom mold.

[0054] Figure 7 It is a schematic diagram of the structure of the first side form used for casting component one.

[0055] Figure 8 It is a schematic diagram of the connection between the first side form and the end form used for casting component one.

[0056] Fig. 9 It is an enlarged view of the connection between the first side form and the end form used for casting component one.

[0057] Fig.10 It is a schematic diagram of the structure of the first side form used for casting component two.

[0058] Fig.11 It is a schematic diagram of the structure of the second side mold.

[0059] The meanings of the numbers in the figure are:

[0060] 1 is the bottom mold, 11 is the bottom mold plate, 12 is the bottom mold support,

[0061] 2 is the end mold,

[0062] 3 is the first side mold, 31 is the first mold frame, 32 is the first side plate, 33 is the bending portion, 34 is the first gap, 35 is the second gap, 36 is the second mold frame, 37 is the second side plate,

[0063] 4 is the second side mold,

[0064] 5 is component one,

[0065] 6 is component 2,

[0066] 7 is the pouring area,

[0067] 8 is the post-casting belt,

[0068] 9 is the first outer blade,

[0069] 10 is a second outer blade,

[0070] 11 is a segmented precast concrete cap beam.

[0071] 12 is the transverse prestressed tendon.

[0072] 13 is the joint reinforcement. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0074] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0075] It should be understood that although the terms first, second, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0076] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0077] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0078] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0079] The present invention provides a piece-by-piece precast concrete cap beam component mold, comprising a bottom mold 1, end molds 2 arranged at both ends of the bottom mold 1, and a first side mold 3 and a second side mold 4 arranged on both sides of the bottom mold 2. The bottom mold 1 and the end mold 2, the first side mold 3 and the second side mold 4 together form a casting area 7 for casting component one 5 or component two 6.

[0080] The segmented precast concrete cap beam comprises a component 1 5, a component 2 6, and a post-cast strip 8 formed in the casting cavity between the component 1 5 and the component 2 6. The component 1 5 and the component 2 6 are cast and formed separately by using the component mold composed of the bottom mold 1, the end mold 2, the first side mold 3 and the second side mold 4.

[0081] The structures of the bottom mold, end mold and second side mold used for casting component 1 5 are the same as those of the bottom mold, end mold and second side mold used for casting component 2 6, but the structure of the first side mold used for casting component 1 5 is different from the structure of the first side mold used for casting component 2 6.

[0082] Specifically, the first side mold used for casting component 1 includes a first mold frame 31 and a first side plate 32. The first mold frame 31 is a steel frame structure, and an inclined bending portion 33 is formed at both ends of the first mold frame 31. In this embodiment, the two ends of the first mold frame 31 are bent outward to form an L-shaped bending portion 33, and the end mold 2 is vertically fixed on the bending portion 33 and has a first gap 34 between its inner side surface and the folding surface of the bending portion. The first gap 34 is used to form a first outer blade 9 extending inward at the end of the cast component 1 5. The first side panel 32 is fixed on the inner side of the first mold frame 31, the plate surface of the first side panel 32 is fitted with the mold surface of the first mold frame 31, the bottom surface shape of the first side panel 32 matches the top surface shape of the bottom mold 1, but the bottom surface of the first side panel 32 does not contact the top surface of the bottom mold 1, and there is a second gap 35 between the bottom surface of the first side panel 32 and the top surface of the bottom mold 1, and the second gap 35 is used to form a second outer blade 10 extending inward on the bottom surface of the cast component 5. At the same time, a positioning hole for penetrating the transverse prestressed tendons 12 is opened on the first side panel 32.

[0083] The first side mold used for casting component 2 includes a second mold frame 36 and a second side plate 37. The second mold frame 36 is also a steel frame structure, and its structure and size are the same as those of the steel frame body of the first mold frame 31, but the two ends of the second mold frame 36 do not have bending parts, and the end mold 2 is obliquely fixed to the end of the second mold frame 36 and the mold surface of the end mold is perpendicular to the mold surface of the second mold frame 36. The second side plate 37 is fixed on the inner side of the second mold frame 36, the plate surface of the second side plate 37 is in contact with the mold surface of the second mold frame 36, the bottom surface shape of the second side plate 37 matches the top surface shape of the bottom mold 1, and the bottom surface of the second side plate 37 is in contact with the top surface of the bottom mold 1, and the second side plate 37 is also provided with a positioning hole for passing the transverse prestressed tendons.

[0084] In this embodiment, the first side plate 32 and the second side plate 37 are both wooden boards.

[0085] The bottom mold 1 includes a bottom mold plate 11 and a plurality of bottom mold pillars 12 fixed at the bottom of the bottom mold plate 11. The shape of the bottom mold plate 11 matches the bottom surface shapes of the first component and the second component.

[0086] The shape of the inner side surface of the second side mold 4 matches the shape of the outer side surface of the component 1 5 and the component 2 6, and the shape of the outer side surface of the component 1 5 is the same as the shape of the outer side surface of the component 2 6. The structure of the second side mold 4 is similar to that of the first side mold, and is also a steel frame structure, and the inner side surface of the steel frame structure is paved with steel plates. In this embodiment, since the outer side surfaces of the components 1 5 and 2 6 are uneven, that is, the lower part of the outer side surface of the components 1 5 and 2 6 is concave inward compared to the upper part of the plate surface and there are multiple rectangular protrusions on the lower part of the plate surface, therefore, in order to cast this shape, in this embodiment, the inner side surface of the second side mold 4 is provided with a folded angle so that the entire inner side surface forms a Z shape and a plurality of grooves are correspondingly provided on the lower part of the plate surface of the side.

[0087] When the above-mentioned bottom mold 1, end mold 2, first side mold 3 and second side mold 4 are assembled together, a casting area 7 can be formed. By pouring concrete into the casting area 7, component 1 5 and component 2 6 can be obtained. The shape of component 2 6 is the same as the main shape of component 1 5, except that a second outer blade 10 extends inward from the bottom of the inner side surface of component 5, and first outer blades 9 extend inward from both ends of the inner side surface. When making the segmented precast concrete cap beam, component 1 5 is matched with component 2 6, and the first outer blade 9 and the second outer blade 10 of component 1 5 will abut against the inner side surface of component 2 6, so that a casting cavity can be formed between component 1 5 and component 2 6, and the first outer blade 9 and the second outer blade 10 can be used as side molds for the subsequent casting of the post-cast strip 8, which not only reduces the formwork work at the construction site, but also enhances the structural integrity and consistency of the cap beam.

[0088] The present invention also provides a construction method of a segmented precast concrete cap beam, which specifically comprises the following steps:

[0089] S1, a component mold is composed of a bottom mold 1, an end mold 2, a first side mold used for component one, and a second side mold 4, and component one is manufactured in the factory. After component one is manufactured, the first side mold used for component one is replaced with the first side mold used for component two to manufacture component two.

[0090] During the process of manufacturing component 1 5 and component 2 6, pile foundations, abutments and pier columns are constructed simultaneously.

[0091] The manufacturing methods of component 1 5 and component 2 6 are the same, and both include the following steps:

[0092] S11, placing the bottom form 1 on a flat ground, the bottom form 1 needs to be fixed flat and firmly to avoid the position from moving or structural deformation during the subsequent installation of the steel cage and pouring, and the position of the bottom form will not be moved during the subsequent installation of the steel cage and mold closing. After the bottom form 1 is installed, clean the bottom form 1, set a positioning plate at the center of the bottom form 1, and set a grouting sleeve on the positioning plate.

[0093] S12, the tied steel cage is hung on the bottom form 1, and a longitudinal prestressed corrugated pipe is inserted into the steel cage.

[0094] The steel cage should be tied firmly as designed. The welding length of double-sided welding on the skeleton steel bar is 5d, and the welding length of single-sided welding is 10d. The thickness of the net protective layer of the steel bar is not less than 25 mm. A 135° hook is provided at the end of the steel bar. The stirrup joints of adjacent steel bars are staggered longitudinally to avoid looseness or deformation during subsequent pouring of concrete.

[0095] The position of the steel cage and the longitudinal prestressed corrugated pipe should be ensured to be accurate to avoid collision with the mold or other components during subsequent mold closing.

[0096] S13, the first side mold 3 and the second side mold 4 are arranged on both sides of the bottom mold 1, and the end mold 2 is arranged at both ends of the bottom mold 1. The bottom mold 1 and the end mold 2, the first side mold 3 and the second side mold 4 together enclose a casting area 7.

[0097] S14, a transverse prestressed corrugated tube is inserted into the positioning hole of the first side form 3, one end of the prestressed corrugated tube extends into the steel cage and the other end is exposed outside the first side form 3, and embedded parts are installed. The position and quantity of the embedded parts need to meet the design requirements to ensure their position and depth in the concrete to avoid crossing or collision with the steel cage or other components.

[0098] S15, pouring ultra-high performance concrete (UHPC) in the pouring area 7, and performing a curing treatment on the formed components after the concrete solidifies.

[0099] S16, when the component is cured until its structural strength reaches 100%, prestressed steel strands can be inserted into the longitudinal and transverse prestressed corrugated pipes.

[0100] S17, demoulding of the component.

[0101] When the component is demoulded, the end mold 2 is removed first, and then the second side mold 4 is removed; then, the side plate of the first side mold 3 is destroyed; finally, the mold frame of the first side mold 3 is removed.

[0102] After component one is manufactured, the first side mold used for component one is replaced with the first side mold used for component two, and component two can be manufactured according to the above method.

[0103] The manufactured components 1 and 2 both have transverse prestressed steel strands and longitudinal prestressed steel strands, and the first outer blades 9 are formed on the inner sides of the two ends of the component 1, and the second outer blades 10 are formed on the inner side of the bottom surface;

[0104] After the components 1 and 2 are manufactured, the first batch of longitudinal prestressed steel strands on the components 1 and 2 are tensioned. When tensioning the prestressed steel strands, they should be tensioned symmetrically, and the initial stress is applied first, and then the tensioning force is gradually increased to the design value and maintained for a set time before grouting and anchoring. In this embodiment, the first batch of 4 N3 prestressed steel strands are tensioned. The 4 N3 prestressed steel strands are tensioned symmetrically using double control. The initial stress is applied to the 4 N3 prestressed steel strands first, and then the tensioning force is gradually increased to the design value, and then anchored after a period of time. After tensioning, the vacuum grouting process is used for grouting and anchoring. The grouting cement strength is not less than 60MPa, and a vacuum grouting agent is used for grouting.

[0105] S2, hoist components one and two onto the pier columns.

[0106] Specifically, component one and component two are pre-assembled first: fix component one, lift component two to make it fit with component one; when component two is moved to fit with component one, fix one end of component two on the ground and slowly lower the other end; while the other end of component two slowly lowers to touch the ground steadily, observe whether the transverse prestressed steel strands on component two and the transverse prestressed steel strands on component one will collide or interfere with each other; if no collision or interference occurs, the pre-assembly of component one and component two is completed; otherwise, the transverse prestressed steel strands on component one or component two are adjusted.

[0107] Then, the first and second components are transported to the viaduct construction site and hoisted onto the pier columns respectively, so that the first outer blade plate 9 and the second outer blade plate 10 of the first component abut against the inner side surface of the second component. At this time, a casting cavity is formed between the first component 5 and the second component 6, and the first outer blade plate 9 and the second outer blade plate 10 can be used as side molds for the subsequent casting of the post-casting strip 8;

[0108] Then, grouting is injected into the grouting sleeves of component 1 5 and component 2 6 to connect component 1 5 and component 2 6 to the pier columns.

[0109] S3, since the transverse prestressed tendons 12 (prestressed steel strands) of component one and the transverse prestressed tendons 12 (prestressed steel strands) of component two are both reserved tendons, the transverse prestressed tendons on component one 5 and the transverse prestressed steel strands on component two 6 can be connected through the joint steel bars 13, and then ultra-high performance concrete (UHPC) is poured into the casting cavity between component one 5 and component two 6 to form a post-cast strip 8, and the post-cast concrete of the bearing pad stone and the block is completed at the same time.

[0110] S4, after the concrete strength of the post-casting strip 8 reaches 100% of the design strength, the second batch of prestressed steel strands on the component 1 5 and the component 2 6 are tensioned longitudinally. In this embodiment, the second batch of 2 N2 and 4 N4 prestressed steel strands are tensioned, and the 2 N2 and 4 N4 prestressed steel strands are also tensioned by double control symmetry. The initial stress is first applied to the 6 prestressed steel strands, and then the tension force is gradually increased to the design value, and anchored after a period of time. After the tensioning is completed, the vacuum grouting process is used for grouting and anchoring. The grouting cement strength is not less than 60MPa, and the vacuum grouting agent is used for grouting.

[0111] S5, tension the transverse prestressed tendons (prestressed steel strands) on component 1 and component 2, then install the prefabricated box girder and tension the third batch of longitudinal prestressed steel strands on component 1 and component 2. In this embodiment, the third batch of 2 N2 and 4 N1 prestressed steel strands are tensioned, and double-controlled symmetrical tensioning is still adopted. Initial stress is first applied to the 6 prestressed steel strands, and then the tensioning force is gradually increased to the design value, and anchored after a period of time. After tensioning, vacuum grouting technology is used for grouting and anchor sealing. The grouting cement strength is not less than 60MPa, and vacuum grouting agent is used for grouting.

[0112] S6, bridge deck construction, completed bridge.

[0113] It should be clear that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A mold for a segmented precast concrete cap beam component, the segmented precast concrete cap beam comprising a component 1, a component 2, and a post-cast strip (8) formed in a casting cavity between the component 1 (5) and the component 2 (6), characterized in that: The component mold comprises a bottom mold (1), end molds (2) arranged at both ends of the bottom mold (1), and a first side mold (3) and a second side mold (4) arranged at both sides of the bottom mold (2); the bottom mold (1), the end mold (2), the first side mold (3) and the second side mold (4) together form a casting area (7) for casting component one (5) or component two (6); The structures of the bottom mold, end mold and second side mold used in casting component one (5) are the same as those of the bottom mold, end mold and second side mold used in casting component two (6). A first side mold used for casting component one comprises a first mold frame (31) and a first side plate (32) fixed on the inner side of the first mold frame (31); two ends of the first mold frame (31) are formed with bending portions (33); an end mold (2) is fixed on the bending portion (33) and a first gap (34) is provided between its inner side surface and the folded surface of the bending portion so that a first outer blade plate (9) is formed on the inner side of the end of component one (5); the bottom surface shape of the first side plate (32) matches the top surface shape of the bottom mold (1) and a second gap (35) is provided between the bottom edge of the first side plate (32) and the top surface of the bottom mold (1) so that a second outer blade plate (10) is formed on the inner side of the bottom surface of component one (5); and a positioning hole for passing a transverse prestressed tendon is provided on the first side plate (32); The first side mold used for casting component 2 comprises a second mold frame (36) and a second side plate (37) fixed on the inner side of the second mold frame (36); the inner side surface of the end mold (2) contacts the end of the second mold frame (36); the bottom edge of the second side plate (37) contacts the top surface of the bottom mold (1); and the second side plate (37) is also provided with a positioning hole for passing a transverse prestressed tendon.

2. The mold for the segmented precast concrete cap beam component according to claim 1 is characterized in that: The structure of the second mold frame (36) is the same as that of the first mold frame (31), both comprising a steel frame and a side mold plate fixed on the inner side of the steel frame.

3. The mold for the segmented precast concrete cap beam component according to claim 1 is characterized in that: The bottom mold (1) comprises a bottom mold plate (11) and a plurality of bottom mold pillars (12) fixed at the bottom of the bottom mold plate (11); the shape of the bottom mold plate (11) matches the bottom surface shapes of the first component and the second component.

4. The mold for the segmented precast concrete cap beam component according to claim 1 is characterized in that: The shape of the inner side surface of the second side mold (4) matches the shape of the outer side surfaces of component one (5) and component two (6).

5. A construction method for a segmented precast concrete cap beam, characterized in that: The specific steps include: S1, using the bottom mold, the end mold, the first side mold used for the component one and the second side mold to form a component mold, and manufacturing the component one in the factory. After the component one is manufactured, the first side mold used for the component one is replaced with the first side mold used for the component two, and the component two is manufactured, and the pile foundation, the abutment and the bridge pier column are constructed simultaneously; The manufactured components 1 and 2 both have transverse prestressed steel strands and longitudinal prestressed steel strands, and the first outer blades (9) are formed on the inner sides of the two ends of the component 1, and the second outer blades (10) are formed on the inner side of the bottom surface; After the components 1 and 2 are manufactured, the first batch of longitudinal prestressed steel strands on the components 1 and 2 are tensioned; S2, hoisting components 1 and 2 onto the pier columns; S3, connecting the transverse prestressed steel strands of the first component with the transverse prestressed steel strands of the second component through the joint steel bars, and then pouring ultra-high performance concrete into the casting cavity between the first component (5) and the second component (6), and completing the post-casting of the support shim and the block concrete at the same time; S4, after the strength of the ultra-high performance concrete in the casting cavity between the first component (5) and the second component (6) reaches 100% of the design strength, tensioning the second batch of longitudinal prestressed steel strands on the first component and the second component; S5, tensioning the transverse prestressed steel strands on the first and second components, then installing the prefabricated box girder and tensioning the third batch of longitudinal prestressed steel strands on the first and second components; S6, bridge deck construction, completed bridge.

6. The construction method of the segmented precast concrete cap beam according to claim 5 is characterized in that: In step S1, the manufacturing methods of component 1 and component 2 are the same, and both include the following steps: S11, placing the bottom mold (1) on a flat ground, setting a positioning plate at the center of the bottom mold (1), and setting a grouting sleeve on the positioning plate; S12, hanging the tied steel cage on the bottom form (1), and inserting a longitudinal prestressed corrugated pipe in the steel cage; S13, arranging the first side mold (3) and the second side mold (4) on both sides of the bottom mold (1), arranging the end mold (2) at both ends of the bottom mold (1), and the bottom mold (1) and the end mold (2), the first side mold (3) and the second side mold (4) together enclose a casting area (7); S14, inserting a transverse prestressed corrugated pipe into the positioning hole of the first side mold (3), wherein one end of the prestressed corrugated pipe extends into the steel cage and the other end is exposed outside the first side mold (3); S15, pouring ultra-high performance concrete in the pouring area (7), and after the concrete solidifies, performing a curing treatment on the formed component; S16, prestressed steel strands are inserted into longitudinal and transverse prestressed corrugated pipes; S17, demoulding of the component.

7. The construction method of the segmented precast concrete cap beam according to claim 6 is characterized in that: The specific steps of demoulding the component in step S17 are: First remove the end mold (2), and then remove the second side mold (4); Then, destroying the side plate of the first side mold (3); Finally, the formwork of the first side form (3) is removed.

8. The construction method of the segmented precast concrete cap beam according to claim 6, characterized in that: The specific steps of hoisting component 1 and component 2 on the bridge pier column in step S2 are: First, pre-assemble component one and component two; Then, the first component and the second component are transported to the viaduct construction site and hoisted onto the bridge pier columns respectively, and the first outer blade plate (9) and the second outer blade plate (10) of the first component are abutted against the inner side surface of the second component; Then, grouting is injected into the grouting sleeves of component one and component two to connect component one and component two with the pier column.

9. The construction method of (UHPC) according to claim 8, characterized in that: The specific steps for pre-assembling component one and component two are as follows: Fix component one and lift component two to make it fit with component one; When component two moves to be in contact with component one, fix one end of component two on the ground and slowly lower the other end. During the process when the other end of component two slowly lowers to touch the ground steadily, observe whether the transverse prestressed steel strands on component two and the transverse prestressed steel strands on component one will collide or interfere with each other. If no collision or interference occurs, the pre-assembly of component one and component two is completed. Otherwise, the transverse prestressed steel strands on component one or component two are adjusted.

10. The construction method of the segmented precast concrete cap beam according to claim 5, characterized in that: Each time the prestressed steel strands are tensioned, they are tensioned symmetrically, and initial stress is applied first. The tensioning force is then gradually increased to the design value and maintained for a set time before grouting and anchoring.

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