A wet joint aluminum formwork system and construction method for viaduct

Abstract

The invention discloses an aluminum formwork system and construction method for wet joints of an elevated bridge. The aluminum formwork system includes a bottom formwork, a side formwork, and a transverse formwork. The bottom formwork and the side formwork are connected via an L-shaped angle aluminum. The length of the side formwork is adjustable, and includes an upper section formwork and a lower section formwork separated from each other. The outer side surfaces of the upper section formwork and the lower section formwork are coplanarly arranged. A plug-in male end is provided at the bottom of the upper section formwork, and a plug-in female end is provided at the top of the lower section formwork. The length of the side formwork is adjusted by controlling the depth of the plug-in male end inserted into the plug-in female end. The cross section of the plug-in female end is concave-shaped, and the cross section of the plug-in male end is rectangular. The inner side surface of the plug-in male end fits the bottom of the concave groove of the plug-in female end. The width of the plug-in male end is equal to the width of the concave groove of the plug-in female end and is greater than the width of the vertical joint. The aluminum formwork system of the invention is easy to build between prefabricated small box beams, and the aluminum formwork system after construction has good stability and sealing properties, and the poured concrete is not easy to leak during the construction process.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a viaduct wet joint aluminum formwork system and a construction method. Background Art

[0002] In the current urban elevated bridge projects, prefabricated assembled beam (small box beam) splicing technology is generally used. First, the construction of piers and cap beams is completed on the ground, and then multiple prefabricated small box beams are hoisted and erected between adjacent cap beams. For areas with heavy rain, wet joint technology is generally used to connect multiple prefabricated small box beams into a whole. Before the wet joint construction, it is necessary to first construct the vertical connecting seam between the mid-span diaphragms of the two adjacent small box beams, and then construct the horizontal connecting seam between the two adjacent small box beams. The vertical connecting seam and the horizontal connecting seam serve as cast-in-place parts after the prefabricated small box beam is in place, which helps to enhance the load-bearing force of the beam body.

[0003] Referring to patent application 202110392398.8, the construction method for wet joints and bottom protection of mid-span diaphragms on bridges over operating lines, in order to ensure that the concrete does not leak during the pouring of the vertical joints and horizontal joints between the prefabricated small box girders and the stability of the formwork, the current vertical joints and horizontal joints are generally poured in two steps. First, the vertical joints of the mid-span diaphragms are poured by building a formwork on the outside of the mid-span diaphragms, so that the mid-span diaphragms between adjacent small box girders are connected as one, and then the entire wet joint is poured by building a formwork at the bottom of the horizontal joint of the small box girders, so that the two adjacent small box girders are connected as a whole. This construction method can ensure the sealing of concrete during pouring to a certain extent, but the construction efficiency will be greatly reduced. It is necessary to pour the horizontal joints between the small box girders after the concrete of the vertical joints between the mid-span diaphragms has solidified.

[0004] Of course, there is also a construction method in which the outer formwork of the mid-span diaphragm and the bottom formwork of the small box girder are built at the same time, and the casting of the vertical connecting joints of the mid-span diaphragm and the horizontal connecting joints of the small box girder are completed simultaneously. However, this construction method is more suitable for construction occasions with a small amount of concrete pouring. If this construction method is used in a large-span viaduct, firstly, the formwork construction process will be more complicated, and secondly, it will be difficult to ensure the stability and sealing of the formwork after installation, and concrete will easily leak from the gaps in the formwork. Summary of the invention

[0005] The purpose of the present invention is to provide a wet joint aluminum formwork system for a viaduct and a construction method. The aluminum formwork system of the present invention is easy to build between prefabricated small box beams, and the aluminum formwork system after construction has good stability and sealing properties, and the poured concrete is not easy to leak during the construction process.

[0006] The technical solution of the present invention is as follows: an aluminum formwork system for wet joints of an elevated bridge, wherein the wet joints of the elevated bridge are T-shaped, including horizontal joints between adjacent small box girders and vertical joints between adjacent mid-span transverse diaphragms, the aluminum formwork system including side forms for blocking both sides of the vertical joints, a bottom formwork for blocking the bottom of the vertical joints, and a transverse formwork for blocking the bottom of the horizontal joints, the bottom formwork and the side formwork are connected via an L-shaped angle aluminum, the L-shaped angle aluminum includes an upper connecting surface and a side connecting surface, the upper connecting surface is connected to the bottom surface of the side formwork, the side connecting surface is connected to the side surface of the bottom formwork, the length of the side formwork is adjustable, and when the L-shaped angle aluminum connects the bottom formwork and the side formwork, the bottom surface height of the side formwork is lower than the highest point of the side surface of the bottom formwork;

[0007] The side mold includes an upper mold and a lower mold separated from each other, and the outer side surfaces of the upper mold and the lower mold are coplanarly arranged to fit the side surface of the mid-span cross partition. A plug-in male end is provided at the bottom of the upper mold, and a plug-in female end is provided at the top of the lower mold. The length of the side mold is adjusted by controlling the depth of the plug-in male end inserted into the plug-in female end; the cross-section of the plug-in female end is concave in shape, and the surface where the concave notch of the plug-in female end is located is coplanar with the outer side surface of the lower mold; the cross-section of the plug-in male end is rectangular, and the outer side surface of the plug-in male end is coplanar with the outer side surface of the upper mold, and the inner side surface of the plug-in male end fits with the bottom of the concave groove of the plug-in female end, and the width of the plug-in male end is equal to the width of the concave groove of the plug-in female end and is greater than the width of the vertical connecting seam.

[0008] Compared with the prior art, the beneficial effects of the present invention are embodied in that the present invention adopts a side form with adjustable length, which can adapt to vertical connecting seams of different lengths. After the present invention is constructed, the horizontal connecting seams between adjacent small box girders and the vertical connecting seams between adjacent mid-span cross partitions can be cast synchronously.

[0009] Among them, the side mold is spliced ​​by the upper mold and the lower mold. Through the design of the specific structure of the male end of the upper mold at the bottom and the female end of the lower mold at the top, when the side mold is adjusted in length, the connection between the upper mold section and the lower mold section can still fit tightly and will not leak the poured concrete; specifically, the cross-section of the plug-in female end is concave, and the cross-section of the plug-in male end is rectangular. The surface where the concave notch of the plug-in female end is located is coplanar with the outer side surface of the plug-in male end. At the same time, the width of the plug-in male end is greater than the width of the vertical connection seam. This allows the side surface of the mid-span diaphragm, the outer side surface of the plug-in male end, the outer side surface of the lower mold, and the surface where the concave notch of the plug-in female end is located to cooperate with each other when concrete is poured, forming a fully enclosed structure for the connection between the upper mold section and the lower mold section, so that concrete is not easy to leak, and the stability and sealing are both high.

[0010] In the aforementioned wet-joint aluminum formwork system for an elevated bridge, a first side panel and a second side panel of equal length are hinged on both sides of the bottom of the upper section formwork, and a third side panel and a fourth side panel of equal length are hinged on both sides of the top of the lower section formwork, an end of the first side panel is hinged to an end of the third side panel, and an end of the second side panel is hinged to an end of the fourth side panel.

[0011] In the aforementioned viaduct wet-joint aluminum formwork system, the sum of the lengths of the first side plate and the third side plate is less than the sum of the lengths of the male plug-in end and the female plug-in end.

[0012] In the aforementioned wet joint aluminum formwork system of an elevated bridge, through holes are correspondingly arranged on the side forms on both sides of the vertical connecting seam, and a sealing tube is connected between the through holes of the side forms on both sides. A first tension bolt is arranged through the inside of the sealing tube, and square tubes tightly attached to the side forms are arranged on both sides of the first tension bolt. Gaskets and nuts are sleeved on the first tension bolts, and the gaskets are tightly attached to the square tubes on both sides. The side forms on both sides of the vertical connecting seam are tightened and fixed by tightening the nuts on the outside of the gaskets.

[0013] In the above-mentioned wet joint aluminum formwork system of an elevated bridge, a pair of square tubes are provided below the bottom formwork, and a pair of square tubes are provided above the small box girder. The bottom formwork is tightened and fixed in the vertical direction by arranging a second pair of tension bolts between the two pairs of square tubes.

[0014] In the aforementioned viaduct wet joint aluminum mold system, both the upper mold and the lower mold are provided with through holes, and the distance between the through hole on the lower mold and the bottom of the female end of the plug is no more than 8 cm.

[0015] In the aforementioned viaduct wet joint aluminum formwork system, the upper connecting surface and the side connecting surface of the L-shaped angle aluminum form an angle of 91° to 93°.

[0016] In the aforementioned wet joint aluminum formwork system for an elevated bridge, the side connecting surface of the L-shaped angle aluminum is in contact with the side surface of the bottom formwork, the upper connecting surface of the L-shaped angle aluminum is provided with a groove, a flexible thermal expansion material is provided in the groove, and a heating device is fixed on the L-shaped angle aluminum for heating the thermal expansion material in the groove.

[0017] In the aforementioned wet-joint aluminum formwork system for an elevated bridge, a reinforcing beam is connected between the upper connecting surface and the side connecting surface of the L-shaped angle aluminum.

[0018] The aforementioned construction method of a viaduct wet joint aluminum formwork system comprises the following steps:

[0019] Step 1: Take two side molds and connect L-shaped adapters to the top of the upper mold of the side molds;

[0020] Step 2: Make the outer side of the side formwork close to the outer side of the mid-span diaphragm, block both sides of the vertical connection seam, and make the L-shaped adapter connected to the top of the upper section formwork support the bottom end of the horizontal connection seam between the small box beams, and tighten and fix the upper section formwork on both sides of the vertical connection seam through the cooperation of square tubes, tension bolts, washers and nuts;

[0021] Step 3: Adjust the relative position between the lower mold and the upper mold by plugging the male end and the female end, so that the bottom end surface of the lower mold is 4 to 8 cm lower than the bottom end of the vertical connection seam;

[0022] Step 4: Tighten and fix the lower molds on both sides of the vertical connection seam through the cooperation of square tubes, tension bolts, washers and nuts to complete the installation of the side molds;

[0023] Step 5: Take the bottom mold and make it seal the bottom opening of the vertical connection seam. Tighten and fix the bottom mold by using square tubes, tension bolts, gaskets and nuts to complete the installation of the bottom mold.

[0024] Step 6: Take the L-shaped angle aluminum, pre-fix the flexible thermal expansion material in the groove on the upper connection surface of the L-shaped angle aluminum, the total volume of the thermal expansion material is larger than the volume of the groove, connect the side connection surface of the L-shaped angle aluminum with the side surface of the bottom mold, connect the upper connection surface of the L-shaped angle aluminum with the bottom surface of the side mold, and complete the installation of the L-shaped angle aluminum;

[0025] Step 7: Take the transverse mold, connect it to the L-shaped adapter, tighten and fix the transverse mold through the cooperation of square tubes, tension bolts, gaskets and nuts, so that the transverse mold blocks the bottom of the horizontal connection seam, and complete the installation of the entire aluminum mold system.

[0026] In the aforementioned construction method of an elevated bridge wet-joint aluminum formwork system, when installing the L-shaped angle aluminum in step six, first, the side connecting surface of the L-shaped angle aluminum is tightly pressed against the side surface of the bottom formwork, and the L-shaped angle aluminum is pushed in the vertical direction, so that the thermal expansion material in the groove of the upper connecting surface of the L-shaped angle aluminum first contacts the bottom surface of the side formwork, and gradually deforms until the upper connecting surface of the L-shaped angle aluminum contacts the bottom surface of the side formwork, and then the upper connecting surface of the L-shaped angle aluminum is fixed to the bottom surface of the side formwork with bolts, and then the side connecting surface of the L-shaped angle aluminum is fixed to the side surface of the bottom formwork with bolts, and finally the heating device is turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 is a cross-sectional view of the internal structure of the present invention;

[0029] Figure 3 It is a side view of the side mold;

[0030] Figure 4It is a schematic diagram of the matching state of the plug-in male end and the plug-in female end;

[0031] Figure 5 It is a schematic diagram of the structure of the male end of the plug;

[0032] Figure 6 It is a schematic diagram of the structure of the female end of the plug;

[0033] Figure 7 It is a schematic diagram of the structure of L-shaped angle aluminum;

[0034] Figure 8 It is a schematic diagram of the matching state between the L-shaped angle aluminum and the side mold and the bottom mold in Example 1;

[0035] Fig. 9 Schematic diagram of the installation position of the sealing strip on the outer side of the side mold in Example 1;

[0036] Fig.10 It is a schematic diagram of the matching state between the L-shaped angle aluminum and the side mold and the bottom mold in Example 2;

[0037] Fig.11 It is a schematic diagram of the installation position of the sealing strip on the outer surface of the side mold in Example 2.

[0038] Figure markings: 1-small box girder, 2-horizontal connecting seam, 3-mid-span cross partition, 4-vertical connecting seam, 5-side mold, 6-bottom mold, 7-transverse mold, 8-L-shaped angle aluminum, 51-upper mold, 52-lower mold, 53-first side plate, 54-second side plate, 55-third side plate, 56-fourth side plate, 57-through hole, 58-sealing tube, 59-first tension bolt, 81-upper connecting surface, 82-side connecting surface, 83-groove, 84-thermal expansion material, 85-heating device, 86-reinforcement beam, 100-L-shaped adapter, 500-cork mold, 510-second tension bolt, 511-plug-in male end, 521-plug-in female end, 600-sealing strip. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0040] Example 1: A wet joint aluminum formwork system for a viaduct, such as Figures 1 to 8As shown, the wet joint of the viaduct is T-shaped, including a horizontal connection seam 2 between adjacent small box girders 1, and a vertical connection seam 4 between adjacent mid-span diaphragms 3. The aluminum formwork system includes side forms 5 for blocking both sides of the vertical connection seam 4, a bottom formwork 6 for blocking the bottom of the vertical connection seam 4, and a transverse formwork 7 for blocking the bottom of the horizontal connection seam 2. The bottom formwork 6 and the side formwork 5 are connected via an L-shaped angle aluminum 8. The L-shaped angle aluminum 8 includes an upper connection surface 81 and a side connection surface 82. The upper connection surface 81 is connected to the bottom surface of the side formwork 5, and the side connection surface 82 is connected to the side surface of the bottom formwork 6. The length of the side formwork 5 is adjustable. When the L-shaped angle aluminum 8 connects the bottom formwork 6 and the side formwork 5, the bottom surface height of the side formwork 5 is lower than the highest point of the side surface of the bottom formwork 6.

[0041] The top of the side mold 5 and the transverse mold 7 are connected via an L-shaped adapter 100 .

[0042] The side mold 5 includes an upper mold 51 and a lower mold 52 separated from each other. The outer side surfaces of the upper mold 51 and the lower mold 52 are coplanarly arranged to fit the side surface of the mid-span diaphragm 3. A plug-in male end 511 is provided at the bottom of the upper mold 51, and a plug-in female end 521 is provided at the top of the lower mold 52. The length of the side mold 5 is adjusted by controlling the depth of the plug-in male end 511 inserted into the plug-in female end 521; the cross-section of the plug-in female end 521 is concave in shape, and the surface where the concave notch of the plug-in female end 521 is located is coplanar with the outer side surface of the lower mold 52; the cross-section of the plug-in male end 511 is rectangular, and the outer side surface of the plug-in male end 511 is coplanar with the outer side surface of the upper mold 51, and the inner side surface of the plug-in male end 511 fits with the bottom of the concave groove of the plug-in female end 521. The width of the plug-in male end 511 is equal to the width of the concave groove of the plug-in female end 521 and is greater than the width of the vertical connecting seam 4.

[0043] The side surface of the mid-span horizontal partition 3, the outer side surface of the plug-in male end 511, the outer side surface of the lower section mold 52 and the surface where the concave groove of the plug-in female end 521 are located cooperate with each other to form a fully enclosed structure for the connection between the upper mold section 51 and the lower mold section 52. However, in order to further improve the sealing effect of the present invention and make the outer side surface of the vertical connecting seam 4 cast flat, when the length of the side mold 5 is adjusted to the right position, a cork mold 500 with the same shape as the gap can be filled in the rectangular gap between the plug-in male end 511 and the plug-in female end 521, and the outer side surface of the cork mold 500 is coplanar with the outer side surface of the plug-in male end 511.

[0044] The cork mold 500 can be prepared in advance, and its width is the same as that of the male end 511 . Its length can be cut at the construction site as required, and finally has an interference fit with the rectangular gap between the male end 511 and the female end 521 .

[0045] In order to further improve the sealing effect of the present invention, strip-shaped concave portions are provided at both ends of the outer side surface of the side mold 5, and sealing strips 600 are installed at the strip-shaped concave portions. When the side mold is installed, the sealing strips 600 are located on both sides of the vertical connection seam 4 and fully cover the vertical connection seam 4 in the length direction. Fig. 9 The sealing strip 600 is disconnected between the upper mold 51 and the lower mold 52, and completely passes through the upper mold 51 and the lower mold 52 in length, and partially overlaps between the outer side surface of the male end 511 and the outer side surface of the female end 521, so as to completely cover both sides of the vertical connection seam 4.

[0046] Preferably, the sealing strip 600 is made of heat-expandable sponge, and an electric heating device is installed on the side mold 5 opposite to the side where the sealing strip 600 is installed. When the vertical connecting seam 4 is poured, the electric heating device is started to expand the sealing strip 600 to improve the sealing performance.

[0047] Preferably, the lengths of the male end 511 and the female end 521 are equal, that is, the adjustable length of the entire side mold 5 is approximately equal to the length of the male end 511. The preferred length of the male end 511 is 30 cm. Concrete at this length selection is not easy to leak and is basically applicable to the casting of vertical connecting seams 4 of various current lengths.

[0048] Preferably, a first side panel 53 and a second side panel 54 of equal length are hinged on both sides of the bottom of the upper mold 51, and a third side panel 55 and a fourth side panel 56 of equal length are hinged on both sides of the top of the lower mold 52. The end of the first side panel 53 is hinged to the end of the third side panel 55, and the end of the second side panel 54 is hinged to the end of the fourth side panel 56. By hingedly connecting the four side panels, the upper mold 51 and the lower mold 52 can be connected as a whole, which has better integrity and helps to achieve the coplanar setting of the outer side surfaces of the upper mold 51 and the lower mold 52.

[0049] Preferably, the sum of the lengths of the first side panel 53 and the third side panel 55 is smaller than the sum of the lengths of the male connector 511 and the female connector 521. That is to say, even when the side mold 5 is pulled to its maximum length, that is, the first side panel 53 and the third side panel 55 are coplanar, the male connector 511 and the female connector 521 can still be plugged in, and the upper mold 51 and the lower mold 52 will not be detached, thereby having good integrity and being easy to carry and transport.

[0050] Preferably, through holes 57 are correspondingly provided on the side molds 5 on both sides of the vertical connecting seam 4, and a sealing tube 58 is connected between the through holes 57 of the side molds 5 on both sides. A first tension bolt 59 is provided through the inside of the sealing tube 58, and square tubes tightly attached to the side molds 5 are provided on both sides of the first tension bolt 59. Gaskets and nuts are sleeved on the first tension bolt 59, and the gaskets are tightly attached to the square tubes on both sides. The side molds 5 on both sides of the vertical connecting seam 4 are tightened and fixed by tightening the nuts on the outside of the gaskets. The method of tightening and fixing by the tension bolts is easy to implement and the tightening of the side molds 5 on both sides of the vertical connecting seam 4 is highly synchronized, which helps to improve the stability and sealing of the aluminum mold system.

[0051] It should be noted that the sealing tube 58 needs to be interference fit with the through holes 57 on the side molds 5 on both sides to prevent concrete leakage. Preferably, the sealing tube 58 can be a plastic tube.

[0052] Preferably, a pair of square tubes are provided below the bottom mold 6, and a pair of square tubes are provided above the small box beam 1. The bottom mold 6 is tightened and fixed in the vertical direction by arranging a second pair of tension bolts 510 between the two pair of square tubes. When the bottom mold 6 is fixed, square wood is padded between the upper surface of the small box beam 1 and the square tubes to increase the toughness of the tightened fixation of the bottom mold 6 and improve the overall sealing and stability.

[0053] The fixing method of the transverse mold 7 is similar to that of the bottom mold 6, and it is only necessary to select shorter tension bolts.

[0054] Preferably, both the upper mold 51 and the lower mold 52 are provided with a through hole 57, so that the upper mold 51 and the lower mold 52 can be tightened and fixed separately, and the distance between the through hole 57 on the lower mold 52 and the bottom of the plug-in female end 521 does not exceed 8 cm, that is, the pulling position on the lower mold 52 is very close to the plug-in female end 521. This design makes the fit between the plug-in male end 511 and the plug-in female end 521 tighter when the lower mold 52 is tightened and fixed, which can further improve the sealing performance of the present invention.

[0055] Preferably, the upper connecting surface 81 and the side connecting surface 82 of the L-shaped angle aluminum 8 form an angle of 92°. Since the side surface of the bottom form 6 and the bottom surface of the side form 5 are not necessarily strictly perpendicular, when concrete leaks between the side surface of the bottom form 6 and the bottom surface of the side form 5, the 92° angle between the upper connecting surface 81 and the side connecting surface 82 of the L-shaped angle aluminum 8 helps to temporarily store the concrete leaked from the side surface of the bottom form 6 and the bottom surface of the side form 5 and prevent further leakage of the concrete.

[0056] Preferably, the side connecting surface 82 of the L-shaped angle aluminum 8 is in contact with the side surface of the bottom mold 6, and the upper connecting surface 81 of the L-shaped angle aluminum 8 is provided with a groove 83, and a flexible thermal expansion material 84 is provided in the groove 83, which can further improve the sealing performance and prevent the concrete flowing out from between the side surface of the bottom mold 6 and the bottom surface of the side mold 5 from further leakage. A heating device 85 is fixed on the L-shaped angle aluminum 8, which can heat the thermal expansion material 84 in the groove 83. When the heating device 85 is turned on, the volume of the thermal expansion material 84 will increase, which will help fill the gap and improve the sealing performance.

[0057] Preferably, the thermal expansion material 84 can be a commercially available conventional thermal expansion sponge.

[0058] Preferably, a reinforcing beam 86 is connected between the upper connecting surface 81 and the side connecting surface 82 of the L-shaped angle aluminum 8 to improve the structural strength of the L-shaped angle aluminum 8.

[0059] Preferably, the mating position of the male connector 511 and the female connector 521 is located slightly above the midpoint of the side mold 5. Since it is closer to the top of the vertical connection seam 4, the internal pressure at the connection between the male connector 511 and the female connector 521 will be smaller when the concrete is poured there.

[0060] A construction method for a viaduct wet joint aluminum formwork system comprises the following steps:

[0061] Step 1: Take two side molds 5, and connect L-shaped adapters 100 to the top of the upper mold 51 of the side mold 5 respectively, and connect them with bolts and nuts. Bolt holes are reserved on the top of the upper mold 51 and the L-shaped adapter 100.

[0062] Step 2: Make the outer side surface of the side form 5 close to the outer side surface of the mid-span diaphragm 3, block the two sides of the vertical connection seam 4, and make the L-shaped adapter 100 connected to the top of the upper section form 51 support the bottom end of the horizontal connection seam 2 between the small box girders 1, and tighten and fix the upper section form 51 on both sides of the vertical connection seam 4 through the cooperation of square tubes, tension bolts, gaskets and nuts.

[0063] Step 3: Adjust the relative position between the lower mold 52 and the upper mold 51 by plugging the male end 511 and the female end 521 so that the bottom end surface of the lower mold 52 is 6 cm lower than the bottom end of the vertical connecting seam 4, and the bottom end surfaces of the lower mold 52 on both sides of the vertical connecting seam 4 are set at the same height.

[0064] Step 4: Tighten and fix the lower mold 52 on both sides of the vertical connecting seam 4 through the cooperation of square tubes, tension bolts, gaskets and nuts, and fill the rectangular gap between the male end 511 and the female end 521 with a cork mold 500 that is consistent with the shape of the gap to complete the installation of the side mold 5.

[0065] Step 5: Take the bottom mold 6 and make it block the bottom opening of the vertical connection seam 4. Tighten and fix the bottom mold 6 through the cooperation of square tubes, tension bolts, gaskets and nuts to complete the installation of the bottom mold 6.

[0066] Step six, take the L-shaped angle aluminum 8, and pre-fix the flexible thermal expansion material 84 in the groove 83 of the upper connecting surface 81 of the L-shaped angle aluminum 8. The total volume of the thermal expansion material 84 is larger than the volume of the groove 83. Connect the side connecting surface 82 of the L-shaped angle aluminum 8 to the side surface of the bottom mold 6, and connect the upper connecting surface 81 of the L-shaped angle aluminum 8 to the bottom surface of the side mold 5 to complete the installation of the L-shaped angle aluminum 8.

[0067] Among them, the upper connecting surface 81 of the L-shaped angle aluminum 8 and the bottom surface of the side mold 5, and the side connecting surface 82 of the L-shaped angle aluminum 8 and the side surface of the bottom mold 6 are connected by bolts and nuts.

[0068] When installing the L-shaped angle aluminum 8 in step six, first make the side connecting surface 82 of the L-shaped angle aluminum 8 close to the side surface of the bottom mold 6, push the L-shaped angle aluminum 8 in the vertical direction, so that the thermal expansion material 84 in the groove 83 of the upper connecting surface 81 of the L-shaped angle aluminum 8 first contacts the bottom surface of the side mold 5, and gradually deforms until the upper connecting surface 81 of the L-shaped angle aluminum 8 contacts the bottom surface of the side mold 5, then fix the upper connecting surface 81 of the L-shaped angle aluminum 8 to the bottom surface of the side mold 5 with bolts, and then fix the side connecting surface 82 of the L-shaped angle aluminum 8 to the side surface of the bottom mold 6 with bolts, and finally turn on the heating device 85.

[0069] Step 7: Take the transverse mold 7, connect the transverse mold 7 to the L-shaped adapter 100, tighten and fix the transverse mold 7 through the cooperation of square tubes, tension bolts, gaskets and nuts, so that the transverse mold 7 blocks the bottom of the horizontal connection seam 2, and completes the installation of the entire aluminum mold system.

[0070] After the aluminum formwork system of the present invention is installed, concrete pouring can be carried out, and the horizontal connection seams 2 between adjacent small box beams 1 and the vertical connection seams 4 between adjacent mid-span transverse diaphragms 3 can be poured simultaneously.

[0071] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "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.

[0072] Embodiment 2: A wet joint aluminum formwork system for a viaduct, which is different from Embodiment 1 in that the length of the side form 5 of this embodiment is not adjustable. When the length of the side form 5 is too long, Fig.10As shown, the vertical connection seam 4 can be sealed by adjusting the height of the L-shaped angle aluminum 8, wherein the side of the bottom mold 6 is provided with a long hole, and the L-shaped angle aluminum 8 can be connected to the side of the bottom mold 6 by bolts and nuts when it is located at different heights.

[0073] In order to further improve the sealing effect of the present invention, strip-shaped concave portions are provided at both ends of the outer side surface of the side mold 5, and sealing strips 600 are installed at the strip-shaped concave portions. When the side mold is installed, the sealing strips 600 are located on both sides of the vertical connection seam 4 and fully cover the vertical connection seam 4 in the length direction. Fig.11 .

[0074] Preferably, the sealing strip 600 is made of heat-expandable sponge, and an electric heating device is installed on the side mold 5 opposite to the side where the sealing strip 600 is installed. When the vertical connecting seam 4 is poured, the electric heating device is started to expand the sealing strip 600 to improve the sealing performance.

[0075] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A viaduct wet joint aluminum formwork system, wherein the viaduct wet joint is T-shaped, including a horizontal joint (2) between adjacent small box girders (1), and a vertical joint (4) between adjacent mid-span diaphragms (3), the aluminum formwork system comprising side forms (5) for blocking both sides of the vertical joint (4), a bottom form (6) for blocking the bottom of the vertical joint (4), and a transverse form (7) for blocking the bottom of the horizontal joint (2), characterized in that: The bottom mold (6) and the side mold (5) are connected via an L-shaped angle aluminum (8), the L-shaped angle aluminum (8) comprising an upper connecting surface (81) and a side connecting surface (82), the upper connecting surface (81) being connected to the bottom surface of the side mold (5), and the side connecting surface (82) being connected to the side surface of the bottom mold (6), and when the L-shaped angle aluminum (8) is connected to the bottom mold (6) and the side mold (5), the bottom surface of the side mold (5) is lower than the highest point of the side surface of the bottom mold (6); Through holes (57) are correspondingly provided on the side molds (5) on both sides of the vertical connection seam (4); a sealing tube (58) is connected between the through holes (57) of the side molds (5) on both sides; a first tension bolt (59) is provided through the inside of the sealing tube (58); square tubes tightly attached to the side molds (5) are provided on both sides of the first tension bolt (59); a gasket and a nut are sleeved on the first tension bolt (59); the gasket is tightly attached to the square tubes on both sides; and the side molds (5) on both sides of the vertical connection seam (4) are tightened and fixed by tightening the nut on the outside of the gasket; The side mold (5) is adjustable in length and comprises an upper mold (51) and a lower mold (52) separated from each other. The outer side surfaces of the upper mold (51) and the lower mold (52) are coplanarly arranged to fit the side surface of the mid-span diaphragm (3). The upper mold (51) is provided with a male plug-in end (511) at the bottom and a female plug-in end (521) at the top of the lower mold (52). The length of the side mold (5) is adjusted by controlling the depth of the male plug-in end (511) inserted into the female plug-in end (521). The female plug-in end (521) is provided with a male plug-in end (511) at the top. 1) has a concave cross-section, the surface where the concave notch of the female plug end (521) is located is coplanar with the outer side surface of the lower mold (52), the male plug end (511) has a rectangular cross-section, the outer side surface of the male plug end (511) is coplanar with the outer side surface of the upper mold (51), the inner side surface of the male plug end (511) fits the bottom of the concave groove of the female plug end (521), and the width of the male plug end (511) is equal to the width of the concave groove of the female plug end (521) and is greater than the width of the vertical connection seam (4); The upper connecting surface (81) and the side connecting surface (82) of the L-shaped angle aluminum (8) form an angle of 91° to 93°; the side connecting surface (82) of the L-shaped angle aluminum (8) is in contact with the side surface of the bottom mold (6); the upper connecting surface (81) of the L-shaped angle aluminum (8) is provided with a groove (83), and a flexible thermal expansion material (84) is provided in the groove (83); and a heating device (85) is fixed on the L-shaped angle aluminum (8) for heating the thermal expansion material (84) in the groove (83).

2. The wet joint aluminum formwork system for viaduct according to claim 1, characterized in that: A pair of square tubes is provided below the bottom mold (6), and a pair of square tubes is provided above the small box beam (1). The bottom mold (6) is tightened and fixed in the vertical direction by arranging second tension bolts (510) between the two square tubes.

3. The viaduct wet joint aluminum formwork system according to claim 1, characterized in that: A first side panel (53) and a second side panel (54) of equal length are hingedly connected on both sides of the bottom of the upper mold (51), and a third side panel (55) and a fourth side panel (56) of equal length are hingedly connected on both sides of the top of the lower mold (52), wherein the end of the first side panel (53) is hingedly connected to the end of the third side panel (55), and the end of the second side panel (54) is hingedly connected to the end of the fourth side panel (56).

4. The wet joint aluminum formwork system for viaduct according to claim 3 is characterized in that: The sum of the lengths of the first side plate (53) and the third side plate (55) is less than the sum of the lengths of the male plug end (511) and the female plug end (521).

5. The wet joint aluminum formwork system for viaduct according to claim 1 is characterized in that: The upper mold (51) and the lower mold (52) are both provided with a through hole (57), and the distance between the through hole (57) on the lower mold (52) and the bottom of the female plug end (521) does not exceed 8 cm.

6. The construction method of a viaduct wet joint aluminum formwork system according to claim 1, characterized in that: The following steps are involved: Step 1: Take two side molds (5), and connect L-shaped adapters (100) to the top of the upper molds (51) of the side molds (5); Step 2: Make the outer side surface of the side mold (5) close to the outer side surface of the mid-span diaphragm (3), block the two sides of the vertical connection seam (4), and make the L-shaped adapter (100) connected to the top of the upper mold (51) support the bottom end of the horizontal connection seam (2) between the small box beams (1), and tighten and fix the upper mold (51) on both sides of the vertical connection seam (4) by cooperating with square tubes, tension bolts, washers and nuts; Step 3: adjusting the relative position between the lower mold (52) and the upper mold (51) by the cooperation of the male plug-in end (511) and the female plug-in end (521), so that the bottom end surface of the lower mold (52) is 4 to 8 cm lower than the bottom end of the vertical connection seam (4); Step 4: tighten and fix the lower molds (52) on both sides of the vertical connection seam (4) by using square tubes, tension bolts, washers and nuts to complete the installation of the side molds (5); Step 5: Take the bottom mold (6), make the bottom mold (6) block the bottom opening of the vertical connection seam (4), tighten and fix the bottom mold (6) by using the square tube, tension bolts, gaskets and nuts, and complete the installation of the bottom mold (6); Step 6: Take the L-shaped angle aluminum (8), and pre-fix the flexible thermal expansion material (84) in the groove (83) of the upper connection surface (81) of the L-shaped angle aluminum (8), wherein the total volume of the thermal expansion material (84) is larger than the volume of the groove (83), and connect the side connection surface (82) of the L-shaped angle aluminum (8) to the side surface of the bottom mold (6), and connect the upper connection surface (81) of the L-shaped angle aluminum (8) to the bottom surface of the side mold (5), thereby completing the installation of the L-shaped angle aluminum (8); Step 7: Take the transverse mold (7), connect the transverse mold (7) to the L-shaped adapter (100), tighten and fix the transverse mold (7) through the cooperation of the square tube, tension bolts, gaskets and nuts, so that the transverse mold (7) blocks the bottom of the horizontal connection seam (2), and completes the installation of the entire aluminum mold system.

7. The construction method of a viaduct wet joint aluminum formwork system according to claim 6, characterized in that: When installing the L-shaped angle aluminum (8) in step 6, the side connecting surface (82) of the L-shaped angle aluminum (8) is first closely attached to the side surface of the bottom mold (6), and the L-shaped angle aluminum (8) is pushed in the vertical direction, so that the thermal expansion material (84) in the groove (83) of the upper connecting surface (81) of the L-shaped angle aluminum (8) first contacts the bottom surface of the side mold (5), and gradually deforms until the upper connecting surface (81) of the L-shaped angle aluminum (8) contacts the bottom surface of the side mold (5), and then the upper connecting surface (81) of the L-shaped angle aluminum (8) is fixed to the bottom surface of the side mold (5) with bolts, and then the side connecting surface (82) of the L-shaped angle aluminum (8) is fixed to the side surface of the bottom mold (6) with bolts, and finally the heating device (85) is turned on.

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