End mold structure for continuous steel structure bridge box girder segment construction

Abstract

The utility model discloses an end mould structure for construction of a continuous steel structure bridge box girder section, which comprises end mould frames arranged at the end parts of side mould plates on two sides of a web plate of the box girder section to be constructed, and an upper end mould plate, an embedded component and a lower sliding end mould plate are sequentially arranged on the outer side of each end mould frame from top to bottom. The upper end template is provided with a mounting groove which is convenient for the bent corrugated pipe below the adjacent web section to pass through, and the outer side of the mounting groove is provided with a movable baffle plate for adjusting and blocking the mounting groove. The end formwork is simple in structure and low in cost, web horizontal distribution steel bars are positioned through the end formwork frame, the steel bar installation precision is effectively improved, the end formwork is designed to be of a multi-section splicing structure, the end formwork can adapt to changes of installation intervals of lower bent bundles of web plates of different sections of a box girder, adapt to height changes of beam bodies of different sections, and are matched with embedded components, and the construction efficiency is improved. Therefore, the end formwork can be quickly and accurately installed, the construction progress is accelerated, the construction deviation is effectively reduced, and the construction quality is improved.

Description

Technical Field

[0001] The utility model relates to an end form structure for the construction of box girder segments of a continuous rigid frame bridge, belonging to the technical field of continuous rigid frame bridge construction. Background Technique

[0002] The cantilever construction of the hanging basket of a continuous rigid frame bridge is a self-propelled construction system that uses the concrete of the constructed pier column as the construction support platform to construct subsequent beam segments, solving the problem of the requirement of the full hall formwork cast-in-place construction process for topographic conditions. When constructing the segments of a continuous rigid frame bridge, since the length and height of each construction segment are changing, the coordinates of the anchoring points of the web downward bending tendons of each segment and the distance between the web downward bending points of the next segment are also changing. Therefore, when installing the end form for each segment, it is necessary to cut the end form to adapt to the change in its distance, which is time-consuming and labor-consuming. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide an end form structure for the construction of box girder segments of a continuous rigid frame bridge, so as to solve at least the problems mentioned in the background technique.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] An end form structure for the construction of box girder segments of a continuous rigid frame bridge, comprising:

[0006] An end form frame, which is arranged at the ends of the side formworks on both sides of the webs of the box girder segments to be constructed. A number of slots are provided on the end form frame corresponding to the positions of the longitudinal distribution bars of the box girder webs for positioning the longitudinal distribution bars of the box girder webs;

[0007] An upper end form board, which is installed within the end form frame. An installation slot is provided on the upper end form board for facilitating the passing of the bellows of the web downward bending tendons of adjacent segments, and a reserved slot corresponding to the position of the bellows of the web downward bending tendons of this segment;

[0008] A movable baffle, which is arranged outside the installation slot. An avoidance hole adapted to the bellows of the web downward bending tendons of adjacent segments is provided on the movable baffle. The movable baffle is larger than the installation slot for adjusting and blocking the installation slot;

[0009] A fitting member, which is arranged within the reserved slot of the upper end form board. A fitting opening adapted to the bellows of the web downward bending tendons of this segment is provided on the fitting member, and an anchor plate structure is provided at the fitting opening;

[0010] A lower sliding end form board, which is arranged below the fitting member and is slidably lapped with the lower end of the upper end form board to adapt to the change in the height of the beam body of different segments.

[0011] Further, the end formwork frame is an L75 angle steel, and a number of slots are symmetrically arranged on both sides of the L75 angle steel corresponding to the positions of the longitudinal distribution bars of the box girder web.

[0012] Further, a grout stop strip is pasted around the installation groove on the upper end formwork.

[0013] Further, the installation groove is a rectangular groove, the length dimension L of the installation groove = Lmax - Lmin + D, and the width dimension W = Wmax + D.

[0014] In the formula, Lmax is the distance between the bellows of the end downward bent tendon anchor point of the 0th segment and the embedded positioning point of the bellows of the web downward bent tendon of the 1st segment;

[0015] Lmin is the distance between the bellows of the downward bent tendon anchor point of the (n - 1)th segment and the embedded positioning point of the bellows of the web downward bent tendon of the nth segment box girder;

[0016] D is the diameter of the bellows of the web downward bent tendon of adjacent segments;

[0017] Wmax is the maximum value of the transverse displacement of the coordinates of the bellows of the web downward bent tendon of adjacent segments.

[0018] Further, the structure of the movable baffle corresponds to the installation groove, the avoidance hole is opened at the center position of the movable baffle, and the length and width of the movable baffle are respectively twice the length and width of the installation groove.

[0019] Further, the upper side edge of the fitting member is perpendicular to the bellows of the web downward bent tendon of this segment, the fitting opening is opened in the middle of the upper side edge, and the anchor plate structure includes an anchor plate arranged at the fitting opening, and a number of anchoring bolts are evenly distributed in the circumferential direction on the anchor plate.

[0020] Further, the lower sliding end formwork is provided with multiple specifications according to the heights of the beam bodies of different segments.

[0021] Further, it further includes an end formwork skeleton. The end formwork skeleton is multiple pieces and is arranged outside the upper end formwork. The movable baffle and the lower sliding end formwork are respectively fixedly connected to the upper end formwork through fastening bolts arranged on the end formwork skeleton.

[0022] Compared with the prior art, the beneficial effects of the present utility model are:

[0023] The utility model has a simple structure and low cost. Firstly, separable end formwork frames are arranged on both sides of the end formwork to position the horizontal distributed steel bars of the web, effectively improving the installation accuracy of the steel bars. Secondly, the end formwork is designed as a multi-segment splicing structure, and an installation groove is opened on the upper end formwork for the bellows of the downward-bending tendons of the web in adjacent segments to pass through. With the detachable movable baffle, it can adapt to the change of the installation spacing of the downward-bending tendons of the web in different segments of the box girder. The lower end formwork is set as a sliding end formwork, which can better adapt to the change of the beam body height in different segments, thus realizing the rapid installation of the end formwork, accelerating the construction progress, effectively reducing the construction deviation and improving the construction quality. In addition, by designing the fitting component to fix the bellows of the downward-bending tendons of the web in this segment, the installation is convenient, efficient and has high installation accuracy, with good economic practicability.

[0024] Other advantages, objectives and features of the utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the objectives, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the drawings, where:

[0026] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0027] Figure 2 is Figure 1 a partially enlarged structural schematic diagram of part A in

[0028] Figure 3 is a side-sectional connection structural schematic diagram of the upper end formwork and the movable baffle;

[0029] Figure 4 is a top-sectional connection structural schematic diagram of the part end formwork and the movable baffle;

[0030] Figure 5 is a side-sectional structural schematic diagram of the fitting component;

[0031] Figure 6 is an elevation view of the bellows of the downward-bending tendons of the web and the steel tendons of the closure section top plate of the continuous rigid frame bridge.

[0032] In the figure: 1, end mold frame; 101, slot; 2, side mold; 3, longitudinal distribution rib; 4, upper end mold; 401, installation slot; 402, reserved slot; 5, movable baffle; 501, avoidance hole; 6, lower curved beam corrugated pipe of the web of the adjacent segment; 7, stop bar; 8, embedded component; 801, embedded opening; 802, side of L installation plate; 9, lower curved beam corrugated pipe of the web of this segment; 10, anchor plate structure; 1 001, anchor plate; 1002, anchor bolts; 11, lower sliding end formwork; 12, end formwork frame; 1201, U-shaped channel steel; 1202, crossbeam; 1203, threaded seat; 13, fastening bolts; 14, bellows at the lower bend beam anchorage point of the end of segment No. 0; 15, bellows at the lower bend beam anchorage point of segment No. 1; 16, bellows at the lower bend beam anchorage point of segment n-1; 17, bellows at the lower bend beam anchorage point of the box girder web of segment n. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] like Figures 1-5 As shown, the first embodiment of the utility model provides an end formwork structure for construction of a continuous steel bridge box girder segment, comprising

[0035] The end mold frame 1 is arranged at the ends of the side templates 2 on both sides of the web of the box girder segment to be constructed, and the end mold frame 1 is provided with a plurality of slots 101 corresponding to the longitudinal distribution ribs 3 of the box girder web, for positioning the longitudinal distribution ribs 3 of the box girder web;

[0036] The upper end template 4 is anchored on the upper side of the end template frame 1, and is provided with a mounting groove 401 for passing the lower bent beam corrugated pipe 6 of the web of the adjacent segment, and a reserved groove 402 corresponding to the position of the lower bent beam corrugated pipe 9 of the web of the segment;

[0037] The movable baffle 5 is arranged outside the installation groove 401, and a avoidance hole 501 matching the outer diameter of the lower bent beam embedded corrugated pipe 6 of the adjacent segment web is provided at the center of the movable baffle 5. The movable baffle 5 is larger than the installation groove 401 and is used to adjust and block the installation groove 401;

[0038] The fitting member 8 is arranged in the reserved groove 402 of the upper end formwork 4. A fitting opening 801 adapted to the corrugated pipe 9 of the downwardly bent tendon in the web of this segment is formed in the fitting member 8. An anchor plate structure 10 is provided at the fitting opening 801, so that the corrugated pipe 9 of the downwardly bent tendon in the web of this segment is anchored to the fitting member 8 through the anchor plate structure 10;

[0039] The lower sliding end formwork 11 is arranged below the fitting member 8 and is slidably lapped with the lower end of the upper end formwork 4 to adapt to the height change of the beam body of different segments.

[0040] The end formwork frame 1 is an L75 angle steel, and a number of notches 101 symmetrically arranged on both sides of the L75 angle steel are opposite to the positions of the longitudinal distribution bars 3 in the web of the box girder.

[0041] As Figure 6 shown, the box girder segments of the continuous rigid frame bridge are based on the main pier of the bridge, and the 0th segment, 1st segment... (n - 1)th segment, and nth segment are successively arranged on one side or both sides of the main pier of the bridge, where n is an integer. The installation groove 401 can be a rectangular groove, and the length dimension L of the installation groove 401 = Lmax - Lmin + D, and the width dimension W = Wmax + D.

[0042] In the formula, Lmax is the distance between the corrugated pipe 14 of the downwardly bent tendon anchoring point at the end of the 0th segment and the pre-buried positioning point of the corrugated pipe 15 of the downwardly bent tendon in the web of the 1st segment;

[0043] Lmin is the distance between the corrugated pipe 16 of the downwardly bent tendon anchoring point of the (n - 1)th segment and the pre-buried positioning point of the corrugated pipe 17 of the downwardly bent tendon in the web of the nth segment of the box girder;

[0044] D is the diameter of the corrugated pipe 6 of the downwardly bent tendon in the web of adjacent segments;

[0045] Wmax is the maximum value of the transverse displacement of the coordinates of the corrugated pipe 6 of the downwardly bent tendon in the web of adjacent segments.

[0046] The grout stop strip 7 is pasted around the installation groove 401 on the upper end formwork 4.

[0047] The structure of the movable baffle 5 corresponds to the installation groove 401. The length and width of the movable baffle 5 are respectively twice the length and width of the installation groove 401, and the avoidance hole 501 is opened at the center position of the movable baffle 5.

[0048] The anchor plate structure 10 includes an anchor plate 1001 arranged at the fitting opening 801, and a number of anchoring bolts 1002 are circumferentially and evenly distributed on the anchor plate 1001.

[0049] The fitting member 8 includes an upper side 802 perpendicular to the downwardly bent duct 9 of the web of this segment. The fitting opening 801 is opened in the middle of the upper side 802 of the fitting, facilitating the downwardly bent duct 9 of the web of this segment to pass through and be installed in the anchor plate fitted on the fitting and the fitting opening 801 on the upper side of the fitting without tilting interference.

[0050] The lower sliding end form 11 is provided in a variety of specifications according to the heights of different segment girders.

[0051] The end form structure for the construction of the continuous rigid frame bridge box girder segment described in this embodiment further includes an end form skeleton 12. The end form skeleton 12 is composed of multiple parts and is arranged outside the upper end form 4. The movable baffle 5 and the lower sliding end form 11 can be fixedly connected to the end form 4 respectively through the fastening bolts 13 provided on the end form skeleton 12. The end form skeleton 12 includes U-shaped steel channels 1201 symmetrically arranged on both sides of the end form 4 in the vertical direction. A cross beam 1202 is provided between the U-shaped steel channels 1201, and a threaded seat 1203 is provided on the cross beam 1202. During use, the movable baffle 5 is made to fit on the outside of the upper end form 4, and the fastening bolt 13 is installed on the threaded seat 1203 and adjusted to make it press against the movable baffle 5. This structure is more convenient for the adjustment and installation of the movable baffle 5.

[0052] The working principle and process of this device:

[0053] (1) After the hanging basket for the continuous rigid frame box girder is assembled and passes the relevant acceptance, assemble the bottom form of the box girder, lay out and position the end form frame 1, install the steel bars of the box girder bottom plate, use the end form frame 1 and the slot 101 to position the verticality of the web steel bars and the spacing of the longitudinal distribution steel bars 3, and install the side form 2 on the outside of the web.

[0054] (2) Layout the coordinates of the downwardly bent ducts 6 of the webs of adjacent segments and the downwardly bent duct 9 of the web of this segment in the web steel bars according to the design parameters, and fix the corresponding ducts with positioning steel bars.

[0055] (3) Use the reserved slot 402 of the end form 4 to position and install the fitting member 8, install the anchor plate 1001, and fix the anchor plate 1001 on the fitting member 8 through the anchor bolts 1002.

[0056] (4) Install the end form 4 in the end form frame 1, paste the grout stop strip 7 around the installation slot 401 of the upper end form 4. During installation, let the downwardly bent ducts 6 of the webs of adjacent segments pass through the installation slot 401 of the upper end form 4 and the avoidance hole 501 of the movable baffle 5 in turn. Adjust the movable baffle 5 to check the relative coordinates of the passing point of the downwardly bent duct 6 of the adjacent segment web and the downwardly bent duct 9 of the web of this segment, make the movable baffle 5 fit on the outside of the installation slot 401, and tighten it with the fastening bolt 13 installed on the end form skeleton 12 to block the installation slot 401 to prevent grout leakage during concrete pouring.

[0057] Similarly, let the corrugated pipe 9 of the downward-bent tendon in the web of this section pass through the anchor backing plate 1001 and the fitting opening 801. After checking the design coordinates of the anchoring point of the corrugated pipe 9 of the downward-bent tendon in the web of this section, fix the end formwork 4.

[0058] (5) Install the lower sliding end formwork 11, seal the overlapping gap with foam glue, and then install the explosion-proof bars and the reinforcement bars under the anchor of the corrugated pipe 9 of the downward-bent tendon in the web of this section.

[0059] (6) Install the side formwork 2 on the inner side of the box girder web, perform tensioning with the outer formwork, lock it with the end formwork, install the top formwork of the inner box, install the reinforcement bars of the box girder top plate, and the prestressed T-tendons and other embedded parts on the top plate.

[0060] (7) Pour concrete in the mold and maintain moisture for curing. After the concrete strength meets the requirements for form removal, screw out the connection bolts of the anchor backing plate, and then remove the end formwork 4. Insert the prestressed tendon into the corrugated pipe 9 of the downward-bent tendon in the web of this section, and remove the top formwork of the inner box and the side formworks 2 on the inner and outer sides and the bottom formwork of the flange plate.

[0061] (8) Cure for 7 days until the concrete strength meets the requirements for prestress application, then install the working anchor fixture to perform prestress tensioning and grouting, thus completing the construction of this section of the box girder. Move the hanging basket forward to implement the next cycle of construction.

[0062] The above is only a preferred embodiment of the present invention, and it does not impose any form of confidentiality restriction on the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical content of the present invention and without departing from the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An end formwork structure for the construction of box girder segments of a continuous rigid frame bridge, characterized in that, including; End mold frame (1), the end mold frame (1) is arranged at the ends of the side formworks (2) on both sides of the web of the box girder segment to be constructed. A number of slots (101) corresponding to the positions of the longitudinal distribution bars (3) of the box girder web are provided on the end mold frame (1) for positioning the longitudinal distribution bars (3) of the box girder web; Upper end formwork (4), the upper end formwork (4) is installed inside the end mold frame (1). An installation slot (401) for facilitating the passing of the corrugated pipe (6) of the downward-curved tendon of the adjacent segment web and a reserved slot (402) corresponding to the position of the corrugated pipe (9) of the downward-curved tendon of the web of this segment are provided on the upper end formwork (4); Movable baffle (5), the movable baffle (5) is arranged outside the installation slot (401). An avoidance hole (501) adapted to the corrugated pipe (6) of the downward-curved tendon of the adjacent segment web is provided on the movable baffle (5). The movable baffle (5) is larger than the installation slot (401) for adjusting and sealing the installation slot (401); Fitting member (8), the fitting member (8) is arranged in the reserved slot (402) of the upper end formwork (4). A fitting opening (801) adapted to the corrugated pipe (9) of the downward-curved tendon of the web of this segment is provided on the fitting member (8). An anchor plate structure (10) is provided at the fitting opening (801); Lower sliding end formwork (11), the lower sliding end formwork (11) is arranged below the fitting member (8) and is slidably lapped with the lower end of the upper end formwork (4) to adapt to the height change of the beam body of different segments.

2. The end formwork structure for the construction of continuous rigid frame bridge box girder segments according to claim 1, characterized in that, The end mold frame (1) is an L75 angle steel, and a number of slots (101) corresponding to the positions of the longitudinal distribution bars (3) of the box girder web are symmetrically arranged on both sides of the L75 angle steel.

3. The end formwork structure for the construction of continuous rigid frame bridge box girder segments according to claim 1, characterized in that, The installation slot (401) is a rectangular slot, and the length dimension L of the installation slot (401) = Lmax - Lmin + D, and the width dimension W = Wmax + D, wherein, Lmax is the distance between the embedded positioning point of the corrugated pipe (14) of the downward-curved tendon anchor point of the 0th segment and the embedded positioning point of the corrugated pipe (15) of the downward-curved tendon of the web of the 1st segment; Lmin is the distance between the embedded positioning point of the corrugated pipe (16) of the downward-curved tendon anchor point of the (n - 1)th segment and the embedded positioning point of the corrugated pipe (17) of the downward-curved tendon of the web of the nth segment box girder; D is the diameter of the corrugated pipe (6) of the downward-curved tendon of the adjacent segment web; Wmax is the maximum value of the transverse displacement of the coordinates of the corrugated pipe (6) of the downward-curved tendon of the adjacent segment web.

4. The end formwork structure for segment construction of continuous rigid frame bridge box girder according to claim 3, characterized in that, A grout stop strip (7) is pasted around the installation slot 401 on the upper end formwork (4).

5. The end formwork structure for the construction of continuous rigid frame bridge box girder segments according to claim 3, characterized in that, The structure of the movable baffle (5) corresponds to the installation slot (401). The avoidance hole (501) is opened at the center position of the movable baffle (5). The length and width of the movable baffle (5) are respectively twice the length and width of the installation slot (401).

6. The end formwork structure for the construction of continuous rigid frame bridge box girder segments according to claim 1, characterized in that, The upper side edge (802) of the fitting member (8) is perpendicular to the corrugated pipe (9) of the downward-curved tendon of the web of this segment. The fitting opening (801) is opened in the middle of the upper side edge (802); the anchor plate structure (10) includes an anchor plate (1001) arranged at the fitting opening (801), and a number of anchor bolts (1002) are circumferentially and uniformly distributed on the anchor plate (1001).

7. The end formwork structure for the construction of continuous rigid frame bridge box girder segments according to claim 6, characterized in that, The lower sliding end formwork (11) is provided in multiple specifications according to the heights of different segment beams.

8. The end formwork structure for the construction of continuous rigid frame bridge box girder segments according to any one of claims 1-7, characterized in that, It further includes an end formwork skeleton (12). The end formwork skeleton (12) is composed of multiple pieces and is arranged on the outer side of the upper end formwork (4). The movable baffle (5) and the lower sliding end formwork (11) are respectively fixedly connected to the upper end formwork (4) through fastening bolts (13) arranged on the end formwork skeleton (12).

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