WO2023092745A1

WO2023092745A1 - Expansion joint construction structure and expansion joint construction method

Info

Publication number: WO2023092745A1
Application number: PCT/CN2021/138793
Authority: WO
Inventors: 王玉玺; 陈有冲; 赵天刚; 常小波; 华鑫; 李信龙
Original assignee: 中铁十局集团青岛工程有限公司
Priority date: 2021-11-26
Filing date: 2021-12-16
Publication date: 2023-06-01
Also published as: CN114108455A

Abstract

An expansion joint construction structure, comprising a preformed joint (110) with embedded steel bars (130) being provided on two sides of the preformed joint (110), wherein the embedded steel bars (130) are arranged in a preformed groove (120); and the preformed groove (120) is covered with a dust cover, the total length of the dust cover being the same as the length of the preformed joint (110). The dust cover is arranged in the preformed groove (120) to protect the embedded steel bars (130) and the preformed joint (110), such that concrete will not enter the preformed groove (120) to block the preformed joint (110) and cover the embedded steel bars (130) during a concrete pouring and paving process. In an installation process for an expansion device, only a corresponding pavement structure (140) needs to be cut, and there is no need for special cleaning of the preformed groove (120), which will not damage the embedded steel bars (130), thereby greatly improving the construction efficiency of the expansion joint and also improving the construction quality of the expansion joint.

Description

Construction structure of expansion joint and construction method of expansion joint

technical field

The invention relates to the field of building construction, more specifically, to a construction structure of bridge expansion joints and a construction method of bridge expansion joints.

Background technique

Expansion joint refers to a structural joint set at an appropriate position along the construction joint direction of a building or structure in order to prevent cracks or damage to the structure due to climate temperature changes (thermal expansion, cold contraction). The expansion joint is to divide the building components above the foundation such as walls, floors, bridges, etc. into two independent parts, so that the building or structure can be horizontally expanded along the long direction.

Bridge expansion joints are the most common expansion joints. During the construction of existing bridge expansion joints, reserved steel bars are usually buried on both sides of the reserved joints, and then the reserved joints are filled with square wood or plastic foam, etc., and then the concrete base bridge is directly laid. Asphalt pavement for bridges and decks. After the maintenance of the bridge deck is completed, cut the reserved slots for the expansion joints, and clean up the concrete around the reserved steel bars before installing the expansion devices. In this kind of construction process, when cutting the reserved groove of the expansion joint, it needs to cut to the reserved steel bar, the cutting depth is relatively deep, and the cleaning process is relatively cumbersome. ) is easy to damage the reserved steel bars, which will affect the connection of the expansion device in the later stage and the firmness of the expansion device after installation.

Therefore, there is a need for a construction structure or construction method of an expansion joint, which can solve the above-mentioned problems.

technical problem

An object of the present invention is to provide a new technical solution for expansion joint construction.

technical solution

According to the first aspect of the present invention, there is provided a construction structure of expansion joints, including reserved joints, embedded steel bars are arranged on both sides of the reserved joints, and the embedded steel bars are arranged in reserved grooves, so The reserved groove is covered with a dust cover, and the total length of the dust cover is consistent with the length of the reserved seam; the width of the reserved groove is larger than the reserved seam, and the reserved seam is set at at the central axis of the reserved groove.

Through this scheme, the dust cover is installed in the reserved groove to protect the pre-embedded steel bars and reserved joints. During the process of concrete pouring and paving, it will not enter the reserved groove to block the To leave seams and wrap pre-embedded steel bars, during the installation of the expansion device, only the corresponding pavement structure needs to be cut, and no special cleaning of the reserved grooves is required, so as not to cause damage to the pre-embedded steel bars, which will greatly improve the performance of the expansion joints. Construction efficiency, and can help to improve the construction quality of expansion joints.

Preferably, the dust cover includes a side plate and a cover plate, the side plate is fixed to the side wall of the reserved groove, the cover plate covers the reserved groove and is placed on the top of the side plate .

Through this scheme, the side plate can be used as a template to assist pouring to complete the reserved groove, and play a supporting role for the reserved groove, avoiding the collapse of the reserved groove caused by mechanical pressure during pouring or paving; The function of dust protection, and when the telescopic device is installed, it only needs to cut to the cover plate to open the cover plate, which helps to further improve the construction efficiency and convenience of construction.

Preferably, several anchor rods are provided through the side plate, and one end of the anchor rods extends into the reserved groove.

Through this solution, the anchor rod can not only improve the fixing effect of the side plate, but also improve the adhesion between the concrete and the side plate after the telescopic device is installed, so as to ensure the firmness and durability of the telescopic device.

Preferably, a support plate is provided at the bottom of the cover plate, and the support plate is supported between the embedded steel bars.

Through this solution, the support plate can support the cover plate, avoid bending and breaking of the cover plate due to top pavement or mechanical pressure, and improve the protective effect of the cover plate.

Preferably, both sides of the cover plate are bent downward to form a limiting plate, and the top of the side plate protrudes upward to form a limiting portion, and when the cover plate is placed on the side plate, the limiting plate The part is located on the side of the limiting plate facing the reserved groove.

Through this scheme, the bent limit plate can improve the strength of the cover plate and improve its pressure bearing capacity; the limit part plays a role in blocking the limit plate, preventing the cover plate from being pushed laterally and moving during the mechanical construction process. Bit corrupted.

Preferably, one side of the support plate extends toward the limit plate to form a support portion, and the support portion is supported to the top of the limit portion.

Through this solution, the support portion can further increase the strength of the cover plate.

Preferably, the top of the side plate extends toward one side to form a protective plate, the protective plate is wrapped to the top of the reserved groove, and the bottom of the limiting plate is placed on the protective plate.

Through this proposal, the supporting effect on the limiting plate is improved, and the protection effect on the reserved groove can be improved, so as to avoid damage and collapse caused by excessive pressure on the limiting plate.

According to the second aspect of the present invention, there is provided an expansion joint construction method using the expansion joint construction structure described in any one of the above, comprising the following steps:

Step 1: Set up formwork parallel to the reserved joints on both sides of the reserved joints so that the reserved steel bars are located between the formworks, and pour concrete to form reserved grooves;

Step 2: Cover the reserved groove with a cover plate and implement paving;

Step 3: After the paving and maintenance are completed, cut along both sides of the cover plate to the formwork, and remove the cover plate;

Step 4: After placing the telescopic device and binding the reserved steel bars, formwork is poured;

Step 5: After the maintenance is completed, install the waterstop and complete the construction of the expansion joint.

Through this scheme, the reserved groove formed by pouring will not be filled due to the later pouring and paving due to the protection of the cover plate, so that in the process of installing the telescopic device, it is only necessary to cut to the formwork and open the cover plate. Gouging and planing out the reserved steel bars again avoids damage to the expansion joints and the reserved steel bars; the most cumbersome step of gouging and planing grooves is omitted, which helps to greatly improve the construction efficiency.

Preferably, in step 1, after the formwork is supported, anchor rods are inserted on the formwork so that both ends of the anchor rods are exposed to the formwork before pouring, leaving a gap between the anchor rods and the reserved steel bars gap.

Through this solution, the setting of the anchor rod can not only improve the supporting capacity of the formwork, ensure the firmness of the formwork, but also improve the firmness of the telescopic device after pouring.

Preferably, in step 2, the pavement height is flush with the upper surface of the cover plate.

Through this scheme, after the pavement is flush with the cover plate, it is convenient for subsequent cutting, so that the cover plate can be used as a positioning mark to avoid damage to the reserved steel bar or side plate caused by the deviation of the cutting position.

Beneficial effect

According to an embodiment of the present disclosure, using the construction structure or construction method of the expansion joint can avoid damage to the reserved joint and the reserved steel bar during the gouging and grooving process, which helps to improve the labor efficiency of the expansion joint. quality; and can greatly improve construction efficiency.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of the construction structure of an expansion joint according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the structure at point A in Fig. 1 .

Fig. 3 is a schematic structural view of the side plate in Fig. 1 .

Fig. 4 is a schematic structural diagram of the cover plate in Fig. 1 .

Embodiments of the present invention

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

Example

As shown in Figures 1 to 4, the construction structure of the expansion joint in this embodiment includes a reserved joint 110, and embedded steel bars 130 are arranged on both sides of the reserved joint 110, and the embedded steel bars 130 are arranged on In the reserved slot 120, the reserved slot 120 is covered with a dust cover, and the total length of the dust cover is consistent with the length of the reserved seam 110; the width of the reserved slot 120 is larger than the reserved slot 120. A seam 110 is provided, and the reserved seam 110 is arranged at the central axis of the reserved groove 120 .

Through the solution of this embodiment, the dust cover is set in the reserved groove 120 to protect the pre-embedded steel bars 130 and the reserved joints 110. During the process of concrete pouring and paving, concrete or asphalt, etc. It will not enter the reserved groove 120 to block the reserved seam 110 and wrap the embedded steel bar 130. During the installation of the telescopic device, only the corresponding pavement structure 140 needs to be cut, and no special cleaning of the reserved groove 120 is required (such as air hammer Gouging and other destructive work), so that it will not cause damage to the pre-embedded steel bar 130, and will not cause damage to the existing concrete structures, which will help greatly improve the construction efficiency of expansion joints, and can help improve the expansion joints. construction quality.

In this embodiment or other embodiments, the dust cover includes a side plate 210 and a cover plate 220, the side plate 210 is fixed to the side wall of the reserved groove 120, and the cover plate 220 covers the A slot 120 is reserved and placed on top of the side plate 210 . The side plate 210 can be used as a formwork to assist the pouring of the reserved groove 120, and play a supporting role for the reserved groove 120, avoiding the collapse of the reserved groove 120 caused by mechanical pressure during the pouring or paving process; It has the function of dust protection, and the cover plate arranged by laying can only need to be cut to the bottom of the cover plate 220 to open the cover plate 220 when the telescopic device is installed, without cutting to the bottom of the reserved groove 120, which greatly reduces the cutting cost. The depth avoids damage to the reserved steel bars, which helps to further improve the construction efficiency and convenience of construction.

The side plate 210 in this embodiment is made of metal, which can be poured into the bridge to enhance the strength of the expansion joint; the cover plate can be made of metal or wood, and can be removed for recycling after the construction of the expansion joint is completed. Reduce construction costs.

In this embodiment or other embodiments, several anchor rods 212 are disposed through the side plate 210 , and one end of the anchor rods 212 extends into the reserved groove 120 . The anchor rod 212 can not only improve the fixing effect of the side plate 210, but also improve the adhesion between the concrete and the side plate 210 after the telescopic device is installed, so as to ensure the firmness and durability of the telescopic device.

In this embodiment or other embodiments, a support plate 221 is provided at the bottom of the cover plate 220 , and the support plate 221 is supported between the embedded steel bars 130 . The support plate 221 can support the cover plate 220 , prevent the cover plate 220 from being bent and broken due to top pavement or mechanical pressure, and improve the strength and protective effect of the cover plate 220 .

In this embodiment or other embodiments, both sides of the cover plate 220 are bent downward to form a limiting plate 223, and the top of the side plate 210 protrudes upward to form a limiting portion 211, and the cover plate 220 overlaps When placed on the side plate 210 , the limiting portion 211 is located on a side of the limiting plate 223 facing the reserved groove 120 . The bent limiting plate 223 can improve the strength of the cover plate 220 and improve its pressure bearing capacity; the limiting part 211 plays a blocking role on the limiting plate 223, preventing the cover plate 220 from being pushed laterally and moving during the mechanical construction process. position is damaged, maintain the stability of the position of the cover plate 220, and prevent the existence of gaps from affecting the protective effect.

In this embodiment or other embodiments, one side of the support plate 221 extends toward the limit plate 223 to form a support portion 222, the support portion 222 is supported to the top of the limit portion 211, and the support portion 222 It is fixed with the limiting plate 223 to improve the integrity and strength of the cover plate 220 , and the support portion 222 can further improve the strength of the cover plate 220 .

In this embodiment or other embodiments, the top of the side plate 210 extends toward one side to form a protective plate 213, the protective plate 213 wraps to the top of the reserved groove 120, and the bottom of the limiting plate 223 overlaps Put it on the protective plate 213 to improve the supporting effect on the limiting plate 223, and the setting of the protective plate 213 can improve the protective effect on the reserved groove 120, and avoid damage and collapse caused by excessive pressure on the limiting plate 223 .

According to an embodiment of the present disclosure, using the construction structure or construction method of the expansion joints of this invention can avoid damage to the reserved joints and the reserved steel bars during the chiseling and grooving process, which helps to improve the expansion and contraction. The quality of the seam workers; and can greatly improve the construction efficiency.

In this embodiment, the expansion joint construction method adopting the construction structure of the above expansion joint specifically includes the following steps:

Step 1: Set up formwork parallel to the reserved joints on both sides of the reserved joints, so that the reserved steel bars are located between the formworks, and pour concrete to form reserved grooves; the formwork is the above-mentioned side plate.

After the bridge is built, in the process of laying the concrete protective layer, side plates are supported on both sides of the reserved joints. After the side plates are supported, both ends of the anchor bar are exposed to the side plates before pouring. The anchor bar There is a gap between the reserved steel bars. The setting of the anchor rod can not only improve the supporting capacity of the side plate and ensure the firmness of the side plate, but also improve the firmness of the telescopic device after pouring; the depth of the reserved groove is consistent with the height of the side plate, so that it can be cut and opened later. There is no need to cut concrete layers when troughing.

After the curing of the concrete protective layer is completed, prepare for the next step of paving.

Step 2: Cover the reserved groove with a cover plate and implement paving;

In this step, the reserved slot is covered with a cover plate, so that the limit plates on both sides of the cover plate are clamped to the outside of the top limit part of the side plate to maintain the position stability of the cover plate; and the support plate at the bottom of the cover plate supports Between the reserved steel bars, it can not only support the cover to strengthen the strength of the cover, but also play a certain role in protecting the reserved steel bars; each support plate is arranged along the direction of the bridge extension to avoid the top During mechanical construction and rolling, the force is rolled along the direction of the support plate extension to ensure the support effect of the support plate.

Step 3: After the pavement and maintenance are completed, cut along the two sides of the cover plate to the side plate, and remove the cover plate;

After the asphalt pavement maintenance is completed, cut along both sides of the cover plate to ensure that the cover plate is separated from the pavement structure on both sides, and it is easy to remove the cover plate;

In this embodiment, the height of the cover plate is consistent with the thickness of the pavement structure, so that the cover plate can be exposed to the paved road surface, and the cover plate is used as a positioning mark to avoid damage to the reserved steel bars or side plates caused by cutting position deviation.

Moreover, the top of the cover plate is flush with the paved road surface, which is convenient for paving construction, and avoids the construction machinery from bumping the cover plate.

In other embodiments, pavement can be laid directly to the top of the cover plate, and then cut to the side of the cover plate according to the marking during the grooving process, so as to open the cover plate and install the telescoping device.

Select the expansion device according to the requirements of the expansion joint, place it in the reserved groove, bind and fix it with the reserved steel bar, and then support the formwork to pour concrete to fix the expansion device.

After the concrete curing is completed, install the rubber waterstop into the expansion device, thus completing the construction of the bridge expansion joint.

Through the solution of this embodiment, the reserved groove formed by pouring will not be filled due to the later pouring and paving due to the protection of the cover plate, so that it is only necessary to cut to the side plate and open the cover plate during the installation of the telescopic device That is, there is no need to re-gouge and plan out the reserved steel bars, thereby avoiding damage to the expansion joints and the damage to the reserved steel bars; the most cumbersome steps of gouging and planing are eliminated, which helps to greatly improve the construction efficiency.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A construction structure of an expansion joint, comprising a reserved joint (110), and pre-embedded steel bars (130) are arranged on both sides of the reserved joint (110), characterized in that the pre-embedded steel bars (130) are arranged on In the reserved slot (120), the reserved slot (120) is covered with a dust cover, and the total length of the dust cover is consistent with the length of the reserved seam; the reserved slot (120) The width is larger than the reserved slit (110), and the reserved slit (110) is arranged at the central axis of the reserved groove (120).
The construction structure of the expansion joint according to claim 1, characterized in that the dust cover includes a side plate (210) and a cover plate (220), and the side plate (210) is fixed to the reserved groove ( 120), the cover plate (220) covers the reserved groove (120) and is placed on top of the side plate (210).
The construction structure of the expansion joint according to claim 2, characterized in that, several anchor rods (212) are provided through the side plate (210), and one end of the anchor rod (212) extends into the reserved slot (120).
The construction structure of the expansion joint according to claim 2, characterized in that, the bottom of the cover plate (220) is provided with a support plate (221), and the support plate (221) is supported to the embedded steel bar (130 )between.
The construction structure of the expansion joint according to claim 4, characterized in that, both sides of the cover plate (220) are bent downward to form a limiting plate (223), and the top of the side plate (210) protrudes upward When the cover plate (220) is placed on the side plate (210), the limit portion (211) is located on the limit plate (223) facing the reserved groove ( 120) on one side.
The construction structure of the expansion joint according to claim 5, characterized in that, one side of the support plate (221) extends toward the direction of the limiting plate (223) to form a support part (222), and the support part ( 222) is supported to the top of the limiting part (211).
The construction structure of the expansion joint according to claim 4, characterized in that, the top of the side plate (210) extends toward one side to form a protective plate (213), and the protective plate (213) is wrapped to the reserved The top of the slot (120) and the bottom of the limiting plate (223) are placed on the protective plate (213).
An expansion joint construction method using the expansion joint construction structure described in any one of claims 1 to 7, characterized in that it comprises the following steps:

Step 1: Set up formwork parallel to the reserved joints on both sides of the reserved joints so that the reserved steel bars are located between the formworks, and pour concrete to form reserved grooves;

Step 2: Cover the reserved groove with a cover plate and implement paving;

Step 3: After the paving and maintenance are completed, cut along both sides of the cover plate to the formwork, and remove the cover plate;

Step 4: After placing the telescopic device and binding the reserved steel bars, formwork is poured;

Step 5: After the maintenance is completed, install the waterstop and complete the construction of the expansion joint.
The construction method for expansion joints according to claim 8, characterized in that, in step 1, after the formwork is supported, anchor rods are inserted on the formwork so that both ends of the anchor rods are exposed to the formwork before pouring, so There is a gap between the anchor rod and the reserved steel bar.
The construction method of the expansion joint according to claim 8, characterized in that, in step 2, the pavement height is flush with the upper surface of the cover plate.