A precast bridge deck panel joint connection construction and its construction method

Abstract

The application discloses a prefabricated bridge deck slab joint connecting structure and a construction method thereof. The structure comprises two prefabricated bridge deck slabs which are butted at two end faces, and first and second circular steel pipes which are embedded at the end faces of the two prefabricated bridge deck slabs and are located on the same axis in the longitudinal direction. A threaded steel bar is arranged in the first and second circular steel pipes, and the threaded steel bar crosses the joint between the end faces of the bridge deck slabs and is anchored at two ends in the first and second circular steel pipes respectively. Cement mortar is poured in the first and second circular steel pipes to fill the pipe cavities and wrap the threaded steel bar. The prefabricated bridge deck slab joint connecting structure and the construction method thereof have good overall stress performance and crack resistance. Meanwhile, the joint connecting structure and the construction method thereof have high assembly efficiency, are convenient to prefabricate, are simple to construct, are low in cost, and have high assembly efficiency.

Description

Technical Field

[0001] This invention belongs to the field of precast concrete structure connection construction, specifically relating to a precast bridge deck joint connection construction and its construction method. Background Technology

[0002] The connection method of precast bridge decks is a crucial factor affecting the assembly efficiency of steel-concrete composite beams. Currently, most precast bridge decks both domestically and internationally rely on pre-reserved ring reinforcement and cast-in-place wet joints. Generally, to enhance the bond strength at the interface of the precast slabs, wet joints require complex, tedious, and quality-unreliable manual roughening of the interface before casting. The deflection deformation of the pre-reserved reinforcement in wet joints makes it difficult to guarantee on-site construction quality. Furthermore, the precast bridge decks exhibit significant shrinkage and creep after placement, and the asynchronous shrinkage between the cast-in-place section and the precast slab causes cracking. Therefore, the development of connection structures that eliminate wet joints for precast bridge decks has been slow, hindering improvements in bridge deck assembly efficiency and construction quality. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a precast bridge deck joint connection structure and its construction method.

[0004] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0005] In a first aspect, the present invention provides a precast bridge deck joint connection structure, comprising two precast bridge decks joined at their ends, wherein a first round steel pipe and a second round steel pipe are respectively embedded at the ends of the two precast bridge decks along the same longitudinal axis, and a threaded steel bar is provided in the first round steel pipe and the second round steel pipe, which crosses the joint between the ends of the bridge decks and is anchored at both ends in the first round steel pipe and the second round steel pipe respectively, and the first round steel pipe and the second round steel pipe are filled with cement mortar that fills the cavity and wraps the threaded steel bar.

[0006] As a further improvement, a rectangular slot with a transverse length greater than the diameter of the steel pipe is respectively opened on the top surface of the two precast bridge decks;

[0007] The threaded steel bar has an anchor head with a diameter between the diameter of the steel bar and the diameter of the steel pipe, which is coaxially fixed at both ends. The distance between the two anchor heads is equal to the distance between the two ends of the two rectangular slots.

[0008] The inner end faces of the two anchor heads are respectively aligned with the outer end face of the corresponding rectangular slot from the joint. An inverted U-shaped limiting steel plate is inserted into the rectangular slot, and the groove of the limiting steel plate is upside down on the threaded steel bar, and the limiting steel plate is positioned against the inner end face of the anchor head from the far end face of the joint to limit and anchor both ends of the threaded steel bar.

[0009] As a further improvement, the tops of the two limiting steel plates are respectively lower than the inner tops of the first and second round steel pipes to form an opening for the upper flow of gas and cement mortar.

[0010] As a further improvement, the length of the second round steel pipe is twice the length of the first round steel pipe, and the length of the first round steel pipe is equal to the distance between the outer ends of the anchor heads at both ends of the threaded steel bar.

[0011] The two rectangular slots are at the same distance from the end face joint of the bridge deck, and the distance between the rectangular slots on the first round steel pipe and the outer end face of the joint to the end of the first round steel pipe on the side away from the end face joint is equal to the axial length of the anchor head.

[0012] As a further improvement, a grouting hole penetrating the top surface of the bridge deck is provided at the end of the second round steel pipe away from the joint.

[0013] As a further improvement, the anchor head is hemispherical in shape, with its circular planar end coaxially fixedly connected to the end of the threaded steel bar; or

[0014] The anchor head is a round or hexagonal nut or bolt that is fixedly connected to the end of the threaded steel bar.

[0015] As a further improvement, during the forming of the precast bridge deck joint connection structure, the rectangular slots and the grouting holes are filled and sealed with cement mortar that is simultaneously cast and formed with the first and second round steel pipes.

[0016] As a further improvement, the end face joints of the prefabricated bridge deck are coated with 3mm of epoxy resin adhesive.

[0017] In a second aspect, the present invention provides a construction method for a precast bridge deck joint connection structure as described in any of the first aspects, comprising the following method steps:

[0018] A first round steel pipe and a second round steel pipe are pre-embedded at the end faces of the two precast bridge decks to be connected, respectively, wherein the length of the second round steel pipe is greater than the length of the first round steel pipe.

[0019] Rectangular slots that penetrate the first and second round steel pipes are respectively opened on the top surface of the precast bridge deck, as well as grouting holes that are connected to the second round steel pipe.

[0020] Insert the threaded steel bar with anchor heads at both ends into the second round steel pipe, apply epoxy resin adhesive to the end face of the precast bridge panel, and hoist and align the end faces of the two precast bridge panels so that the first round steel pipe and the second round steel pipe are connected.

[0021] Compressed air is injected into the second round steel pipe from the grouting hole using an air compressor, so that the threaded steel bar and anchor head move along the pipe toward the first round steel pipe;

[0022] By observing the movement of the threaded steel bar and anchor head through the rectangular slot, it can be determined whether the inner end faces of the two anchor heads are aligned with the outer end face of the corresponding rectangular slot from the joint.

[0023] When the end faces are aligned, an inverted U-shaped limiting steel plate is inserted into the rectangular slot. The groove of the limiting steel plate is inverted on the threaded steel bar, and the end face of the limiting steel plate far from the joint is positioned against the inner end face of the anchor head to limit and anchor both ends of the threaded steel bar.

[0024] Cement mortar is injected into the second round steel pipe through the grouting hole to make the cement mortar densely fill the cavities of the first and second round steel pipes and wrap the threaded steel bar and anchor head. The grouting operation is stopped when cement mortar overflows from the rectangular slot.

[0025] As a further improvement, the length of the second round steel pipe is set to twice the length of the first round steel pipe, and the overall length of the threaded steel bar and the anchor head is equal to the length of the second round steel pipe, so that the threaded steel bar and the anchor head can be inserted into the second round steel pipe as a whole.

[0026] When the limiting steel plate is anchored to the inner end face of the anchor head, the top of the limiting steel plate is lower than the inner top of the first round steel pipe and the second round steel pipe, and the end faces of the two anchor heads away from the end face joint abut against the inner end faces of the first round steel pipe and the second round steel pipe.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The precast bridge deck joint connection structure and construction method provided by the present invention use pre-embedded round steel pipes, threaded steel bars, anchor heads, steel plates, etc. to form anchoring and connecting at the end face joints. In the corresponding process, the use of pre-embedded round steel pipes, compressed gas to push the steel bars to move, steel plate anchoring and limiting, and cement mortar filling and sealing can avoid the shrinkage and creep effect of wet joints, and have better overall stress performance and crack resistance. At the same time, the joint structure and construction method can achieve rapid and simple construction, convenient prefabrication, and low cost. Attached Figure Description

[0028] Figure 1 A schematic elevation view of a dry joint of a precast bridge deck provided for implementation of the present invention;

[0029] Figure 2 A schematic diagram of a dry joint of a precast bridge deck provided for implementation of the present invention;

[0030] Figure 3 A schematic diagram illustrating the construction of a hemispherical anchor head threaded steel bar and a bolt anchor head threaded steel bar provided for implementation of the present invention;

[0031] Figure 4A schematic diagram of a precast bridge deck embedded with a circular steel pipe provided for implementation of the present invention;

[0032] Figure 5 A schematic diagram of a structure for installing a threaded steel bar with an anchor head according to an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of a prefabricated bridge deck, the alignment and assembly of round steel pipes, and the compressed air pushing of threaded steel bars provided for implementation of the present invention;

[0034] Figure 7 A schematic diagram of a steel plate for placing a rectangular slot for anchoring and limiting a threaded steel bar, provided according to an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of a cement mortar grouting seal in a dry joint structure provided for implementation of the present invention.

[0036] In the picture:

[0037] 1. Precast bridge deck; 2. First round steel pipe; 3. Second round steel pipe; 4. Threaded steel bar; 5. Anchor head; 6. Steel plate; 7. Rectangular slot; 8. Grouting hole; 9. Cement mortar; 10. Transverse reinforcement; 11. Longitudinal reinforcement; 12. End face joint. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0039] Example

[0040] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a precast bridge deck joint connection structure, including two precast bridge decks 1 joined at their ends. A first round steel pipe 2 and a second round steel pipe 3 located on the same longitudinal axis are pre-embedded at the ends of the two precast bridge decks 1. A threaded steel bar 4 is provided in the first round steel pipe 2 and the second round steel pipe 3, which crosses the joint between the ends of the bridge decks and is anchored at both ends in the first round steel pipe 2 and the second round steel pipe 3 respectively. Cement mortar 9, which fills the cavity and wraps the threaded steel bar 4, is poured into the first round steel pipe 2 and the second round steel pipe 3.

[0041] Specifically, the open ends of the first round steel pipe 2 and the second round steel pipe 3 are located at the interface / end joint 12 of the precast bridge deck 1. Their axial direction is parallel to the longitudinal steel bar 11 and located at the center of the two longitudinal steel bars 11. Their pre-embedded height is located below the transverse steel bar 10. The pre-embedded round steel pipe is tied and fixed by the transverse steel bar 10.

[0042] In this embodiment, a rectangular slot 7 is provided on the top surface of each of the two precast bridge deck panels 1, which passes through the first round steel pipe 2 and the second round steel pipe 3 and has a lateral width greater than the diameter of the steel pipe.

[0043] An anchor head 5 with a diameter between the diameter of the steel bar and the diameter of the steel pipe is coaxially fixed to both ends of the threaded steel bar 4, and the distance between the two anchor heads 5 is equal to the distance between the two ends of the two rectangular slots 7.

[0044] The inner end faces of the two anchor heads 5 are aligned with the outer end faces of the corresponding rectangular slots 7. An inverted U-shaped limiting steel plate 6 is inserted into the rectangular slot 7 and configured such that the groove of the limiting steel plate 6 is upside down on the threaded steel bar 4, and the side end face of the limiting steel plate 6 away from the end face joint 12 is positioned against the inner end face of the anchor head 5 to limit and anchor both ends of the threaded steel bar 4.

[0045] The diameter of the anchor head 5 is between the diameter of the steel rod and the diameter of the steel pipe, which can reserve a gap between the anchor head 5 and the inner wall of the round steel pipe to allow the cement mortar 9 to flow. At the same time, the tops of the two limiting steel plates 6 are lower than the inner tops of the first round steel pipe 2 and the second round steel pipe 3, respectively, to form a gap for gas and cement mortar 9 to flow from the top.

[0046] The inverted U-shaped limiting steel fixing plate 6 matches the size and shape of the rectangular slot 7, and its width is also greater than the diameter of the pre-embedded first round steel pipe 2 and the second round steel pipe 3. The diameter of its groove is the same as the diameter of the threaded steel bar 4. According to the prediction of the stress transmission path after the bridge deck cracks, the weak point of the precast bridge deck 1 is its interface. First, the epoxy resin bonding force at the cracked section is overcome, and the exposed threaded steel bar 4 becomes a stress concentration area. The stress is first transmitted to the post-filled cement mortar 9 through the threaded steel bar 4. When the interlocking force between the two is overcome and slippage occurs, the stress is transmitted to the steel fixing plate 6 through the hemispherical anchor head 5. The steel fixing plate 6 is limited and anchored by the rectangular slot 7 of the precast bridge deck 1, thus realizing a reasonable stress transmission path between the precast bridge deck 1 and the precast bridge deck.

[0047] The aforementioned hemispherical anchor head 5 provides anchoring force for the threaded steel bar 4. The interlocking force formed between the threaded steel bar 4 and the post-injected cement mortar 9 can provide sufficient tensile and bending bearing capacity between the precast bridge deck 1 of the dry joint structure. Based on the principle that increasing the reinforcement ratio in the joint area can improve the crack resistance of the joint area, the anchoring setting of the threaded steel bar 4 can increase the crack bearing capacity of the dry joint interface.

[0048] Meanwhile, the combined use of the inverted U-shaped steel fixing plate 6 and the hemispherical anchor head 5 can increase the anchoring capacity of the threaded steel bar 4 and shorten its anchoring length, so that the steel bar will not fall out due to anchoring failure after the cracks at the interface of the dry joint develop.

[0049] To achieve a compact and structurally stable dry joint construction, the length of the second round steel pipe 3 is twice the length of the first round steel pipe 2, and the length of the first round steel pipe 2 is equal to the distance between the outer ends of the anchor heads 5 at both ends of the threaded steel bar 4. The two rectangular slots 7 are equidistant from the bridge deck end face joint 12, and the distance between the outer end face of the rectangular slots 7 on the first round steel pipe 2 and the end of the first round steel pipe 2 on the side furthest from the end face joint 12 is equal to the axial length of the anchor head 5, meaning that the anchor head 5 located at the first round steel pipe 2 is exactly abutting against the inner end of the first round steel pipe 2.

[0050] Among them, a grouting hole 8 is opened at the end of the second round steel pipe 3 on the side away from the end face joint 12, which penetrates the top surface of the bridge deck. It is used to inject high-pressure compressed air from the air gun into the second round steel pipe 3 to push the threaded steel bar 4 and the anchor head 5 to move towards the first round steel pipe 2, and to grout and seal the second round steel pipe 3.

[0051] In this embodiment, reference Figure 3 As shown, the anchor head 5 is hemispherical in shape and its circular flat end is coaxially fixedly connected to the end of the threaded steel bar 4; or the anchor head 5 adopts a circular or hexagonal nut or bolt that is fixedly connected to the end of the threaded steel bar 4.

[0052] When the anchor head 5 is hemispherical, during the process of using a high-pressure air gun to punch and push the threaded steel bar 4 and the anchor head 5, there is only one point of contact between the hemispherical ball and the round steel pipe.

[0053] From f = μN, we can deduce that the frictional force is positively correlated with the normal force on the friction surface. N is the reaction force caused by the mass of the threaded steel rod 4 of the welded steel plate 6 and the acceleration due to gravity, and μ is the roughness of the friction surface. Since N = σS, the larger the area S of the friction surface, the smaller σ is, and the smaller the change in roughness μ during friction. Conversely, the smaller the area S of the friction surface, the larger σ is, and the greater the change in the coefficient of friction μ during friction. Since the normal force N is constant, a decrease in μ results in a decrease in the frictional force f. Using a hemispherical anchor head 5 further improves assembly efficiency, applicability, and scientific rigor.

[0054] Therefore, the threaded steel bar 4 is heated and extruded to form hemispherical anchor heads 5 at both ends. During the compressed air jet process, the movement trajectory of the threaded steel bar 4 is generally irregular. Under the pushing action, the hemispherical anchor heads 5 overcome the friction between the hemispherical anchor heads 5 and the steel pipe and form a sliding. During the sliding process, the hemispherical has the function of collision and crossing compared with other cross-sectional forms. At the same time, the hemispherical anchor heads 5 guide the airflow to the circumference of the anchor head 5 to make its movement smooth and reduce collisions.

[0055] The end joint 12 of the precast bridge deck 1 is coated with 3mm epoxy resin adhesive. When the precast bridge deck joint connection structure is formed, the rectangular slot 7 and the grouting hole 8 are filled and sealed with cement mortar 9 that is poured and formed simultaneously with the first round steel pipe 2 and the second round steel pipe 3.

[0056] This invention also provides a construction method for the above-mentioned precast bridge deck joint connection structure, including the following steps:

[0057] Step S1: Prefabricate precast bridge deck 1, first round steel pipe 2, second round steel pipe 3, threaded steel bar 4 with anchor head 5, and cement mortar 9, etc., according to specific design requirements.

[0058] Among them, the threaded steel bar 4 is heated by quenching and then extruded to produce a steel bar connector with hemispherical anchor heads 5 at both ends and a threaded bar in the middle. The threaded steel bar 4 can use bolts as anchor heads 5. The threaded steel bar 4 and the nut can be tightened together by their threads to fix it to the end of the threaded steel bar 4. The outer diameter of the selected hexagonal nut is smaller than the diameter of the pre-embedded steel pipe.

[0059] Step S2: Embed a first circular steel pipe 2 and a second circular steel pipe 3 at the end faces of the two precast bridge deck panels 1 to be connected, respectively. The length of the second circular steel pipe 3 is greater than the length of the first circular steel pipe 2. (Refer to...) Figure 4 .

[0060] Specifically, the length of the second round steel pipe 3 is set to twice the length of the first round steel pipe 2, and the overall length of the threaded steel bar 4 and the anchor head 5 is equal to the length of the second round steel pipe 3, so that the threaded steel bar 4 and the anchor head 5 can be inserted into the second round steel pipe 3 as a whole.

[0061] The open ends of the first circular steel pipe 2 and the second circular steel pipe 3 are located at the interface of the precast bridge deck 1, and their axial direction is parallel to the longitudinal reinforcement 11 and located at the center of the two longitudinal reinforcements 11. The pre-embedded height is located below the transverse reinforcement 10, and the pre-embedded circular steel pipe is tied and fixed by the transverse reinforcement 10.

[0062] Step S3: Rectangular slots 7, communicating with the first circular steel pipe 2 and the second circular steel pipe 3, are respectively opened on the top surface of the precast bridge deck 1. Grouting holes 8, communicating with the second circular steel pipe 3, are also opened. (Refer to...) Figure 4 .

[0063] The rectangular slots 7 and grouting holes 8 can also be pre-drilled during the preparation of the precast bridge deck 1. Similarly, the first round steel pipe 2 and the second round steel pipe 3 are also pre-drilled with openings that match the rectangular slots 7 and grouting holes 8.

[0064] Step S4: Insert the threaded steel bar 4 with anchor heads 5 at both ends into the second round steel pipe 3. Apply 3mm epoxy resin adhesive to the end face of the precast bridge deck 1, and hoist and align the end faces of the two precast bridge decks 1, ensuring that the first round steel pipe 2 and the second round steel pipe 3 are connected. (Refer to...) Figure 5 , Figure 6 .

[0065] Step S5: Using a high-pressure air gun / air compressor, compressed air is injected from the grouting hole 8 into the second round steel pipe 3, causing the threaded steel bar 4 and the anchor head 5 to move along the pipe towards the first round steel pipe 2. (Refer to...) Figure 6 .

[0066] A portable micro air compressor is hoisted onto the precast bridge deck 1. An insertable rigid tube is extended into the grouting hole 8. The compressed air increases the pressure to a level sufficient to overcome the friction between the embedded round steel pipe and the steel fixing plate 6. The valve is opened instantly, causing the air volume at the end of the embedded steel pipe to expand and push the hemispherical anchor head 5 to move to the interface position.

[0067] Step S6: Observe the movement position of the threaded steel bar 4 and the anchor head 5 through the rectangular slot 7, and determine whether the inner end face of the two anchor heads 5 is aligned with the outer end face of the corresponding rectangular slot 7.

[0068] When the end faces are aligned, an inverted U-shaped limiting steel plate 6 is inserted into the rectangular slot 7. The groove of the limiting steel plate 6 is inverted onto the threaded steel bar 4, and the side end face of the limiting steel plate 6 away from the end face joint 12 is positioned against the inner end face of the anchor head 5 to limit and anchor both ends of the threaded steel bar 4. (Refer to...) Figure 7 .

[0069] When the limiting steel plate 6 is anchored to the inner end face of the anchor head 5, the top of the limiting steel plate 6 is lower than the inner top of the first round steel pipe 2 and the second round steel pipe 3, and the end face of the two anchor heads 5 away from the end face joint 12 abuts against the inner end face of the first round steel pipe 2 and the second round steel pipe 3.

[0070] If the hemispherical steel plate 6 cannot be pushed to the end of the first round steel pipe 2 embedded in the bridge deck, it is considered unqualified and should be punched and pushed again until it is qualified.

[0071] Step S7: Inject cement mortar 9 into the second circular steel pipe 3 through the grouting hole 8, so that the cement mortar 9 densely fills the cavities of the first circular steel pipe 2 and the second circular steel pipe 3, and wraps the threaded steel bar 4 and the anchor head 5. Stop the grouting operation when the cement mortar 9 overflows from the rectangular slot 7. (Refer to...) Figure 8 .

[0072] When grouting cement mortar 9, the self-weight method or the high-level funnel method can be selected. Cement mortar 9 is poured in through the grouting hole 8 and overflows / flows out through the rectangular groove hole 7. After grouting is completed and allowed to stand, grout is added again and water is sprinkled in time for curing. Straw bags are added to keep it moist and it is cured for seven days.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0074] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A precast bridge deck joint connection structure, comprising two precast bridge decks mated at their end faces, characterized in that, The two precast bridge deck end faces are respectively embedded with a first round steel pipe and a second round steel pipe located on the same axis along the longitudinal direction. A threaded steel bar is provided in the first round steel pipe and the second round steel pipe, which crosses the joint between the bridge deck end faces and is anchored at both ends in the first round steel pipe and the second round steel pipe respectively. Cement mortar that fills the cavity and wraps the threaded steel bar is poured into the first round steel pipe and the second round steel pipe. A rectangular slot with a transverse length greater than the diameter of the steel pipe is opened on the top surface of each of the two precast bridge decks, which passes through the first and second round steel pipes respectively. The threaded steel bar has an anchor head with a diameter between the diameter of the steel bar and the diameter of the steel pipe, which is coaxially fixed at both ends. The distance between the two anchor heads is equal to the distance between the two ends of the two rectangular slots. The inner end faces of the two anchor heads are respectively aligned with the outer end face of the corresponding rectangular slot from the joint. An inverted U-shaped limiting steel plate is inserted into the rectangular slot, and the groove of the limiting steel plate is upside down on the threaded steel bar, and the end face of the limiting steel plate far from the joint is locked against the inner end face of the anchor head to limit and anchor both ends of the threaded steel bar.

2. The precast bridge deck joint connection structure according to claim 1, characterized in that, The tops of the two limiting steel plates are respectively lower than the inner tops of the first and second round steel pipes to form an opening for the upper flow of gas and cement mortar.

3. The precast bridge deck joint connection structure according to claim 2, characterized in that, The length of the second round steel pipe is twice the length of the first round steel pipe, and the length of the first round steel pipe is equal to the distance between the outer ends of the anchor heads at both ends of the threaded steel bar. The two rectangular slots are at the same distance from the end face joint of the bridge deck, and the distance between the rectangular slots on the first round steel pipe and the end of the first round steel pipe on the side away from the end face joint is equal to the axial length of the anchor head.

4. The precast bridge deck joint connection structure according to claim 3, characterized in that, A grouting hole is provided on the end of the second round steel pipe away from the joint, which extends through the top surface of the bridge deck.

5. The precast bridge deck joint connection structure according to claim 4, characterized in that, The anchor head is hemispherical in shape and its circular flat end is coaxially fixedly connected to the end of the threaded steel bar; or the anchor head is a circular or hexagonal nut or bolt that is fixedly connected to the end of the threaded steel bar.

6. The precast bridge deck joint connection structure according to claim 5, characterized in that, During the forming of the precast bridge deck joint connection structure, the rectangular slots and the grouting holes are filled and sealed with cement mortar that is simultaneously cast and formed with the first and second round steel pipes.

7. The precast bridge deck joint connection structure according to claim 6, characterized in that, The end joints of the precast bridge deck are coated with 3mm of epoxy resin adhesive.

8. The construction method of the precast bridge deck joint connection structure as described in any one of claims 1 to 7, characterized in that, The methods and steps include the following: A first round steel pipe and a second round steel pipe are pre-embedded at the end faces of the two precast bridge decks to be connected, respectively, wherein the length of the second round steel pipe is greater than the length of the first round steel pipe. Rectangular slots that penetrate the first and second round steel pipes are respectively opened on the top surface of the precast bridge deck, as well as grouting holes that are connected to the second round steel pipe. Insert the threaded steel bar with anchor heads at both ends into the second round steel pipe, apply epoxy resin adhesive to the end face of the precast bridge panel, and hoist and align the end faces of the two precast bridge panels so that the first round steel pipe and the second round steel pipe are connected. Compressed air is injected into the second round steel pipe from the grouting hole using an air compressor, so that the threaded steel bar and anchor head move along the pipe toward the first round steel pipe; By observing the movement of the threaded steel bar and the anchor head through the rectangular slot, it can be determined whether the inner end faces of the two anchor heads are aligned with the outer end faces of the corresponding rectangular slots. When the end faces are aligned, an inverted U-shaped limiting steel plate is inserted into the rectangular slot. The groove of the limiting steel plate is inverted on the threaded steel bar, and the limiting steel plate is positioned against the inner end face of the anchor head from the far end face of the joint to limit and anchor both ends of the threaded steel bar. Cement mortar is injected into the second round steel pipe through the grouting hole to make the cement mortar densely fill the cavities of the first and second round steel pipes and wrap the threaded steel bar and anchor head. The grouting operation is stopped when cement mortar overflows from the rectangular slot.

9. The construction method for the precast bridge deck joint connection structure according to claim 8, characterized in that, The length of the second round steel pipe is set to twice the length of the first round steel pipe, and the overall length of the threaded steel bar and the anchor head is equal to the length of the second round steel pipe, so that the threaded steel bar and the anchor head can be inserted into the second round steel pipe as a whole. When the limiting steel plate is anchored to the inner end face of the anchor head, the top of the limiting steel plate is lower than the inner top of the first round steel pipe and the second round steel pipe, and the end faces of the two anchor heads away from the end face joint abut against the inner end faces of the first round steel pipe and the second round steel pipe.

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