CN102979221A - Shear wall structure configured with crossed slant internal prestress and construction method of shear wall structure - Google Patents

Abstract

A shear wall structure configured with intersecting oblique internal prestressing, including the shear wall body, the horizontal reinforcement of the shear wall body, the vertical reinforcement of the shear wall body, the upper left corner of the shear wall body and the The upper right corner of the shear wall tooth plate and the prestressed tension end anchor are respectively set, the lower left corner and the lower right corner of the shear wall body are respectively equipped with the prestressed anchorage end anchorage, and the prestressed anchorage end anchorage and the prestressed There are intersecting oblique prestressed steel tendons and intersecting oblique prestressed pipes between the tension end anchorages. The construction method of the above structure includes: setting up the shear wall formwork, binding the ordinary steel bars of the wall body; laying out and installing the intersecting oblique prestressed pipes; passing through the prestressed steel beams, installing the prestressed anchors; pouring and curing the concrete of the shear walls; Prestressed tension, pipeline grouting, end anchoring. The invention greatly improves the seismic performance of the shear wall.

Description

A shear wall structure with intersecting oblique internal prestress and its construction method

technical field

The invention relates to a shear wall structure configured with intersecting oblique internal prestress and a construction method thereof.

Background technique

Shear wall is an important component that bears vertical and horizontal loads in the concrete structure of high-rise buildings. Its stress state and mechanical properties directly determine the bearing capacity and structural safety of high-rise buildings. Under the combined action of vertical loads such as the self-weight of the structure and floor live loads, and horizontal loads such as horizontal earthquakes and wind loads, the shear wall will generate principal tensile stress along the diagonal direction of the shear wall body plane. Since the acting direction of the horizontal load can be changed due to the change of the wind direction and the horizontal earthquake direction, the principal tensile stress may appear in both diagonal directions of the wall plane. However, in the current design method of shear wall structure, only ordinary steel bars along the horizontal direction and vertical direction of the wall plane are arranged inside the shear wall, and the arrangement orientations of horizontal steel bars and vertical steel bars are inconsistent with the main tensile stress action orientations. Power transmission is not direct. Under the action of the main tensile stress, the shear wall concrete is prone to oblique cracks along the diagonal direction of the wall plane, and will appear along the two diagonal directions of the wall plane with the reciprocating change of the horizontal load direction. Oblique cracks and gradually expand. The expansion of cross oblique cracks to a certain extent will cause the stiffness of the shear wall to degenerate, resulting in a decrease in the bearing capacity of the shear wall. Under the action of rare earthquakes, the width of oblique cracks increases rapidly, and the sharply expanding crossing oblique cracks not only seriously reduce the stiffness of the shear wall, but also cause the horizontal and vertical steel bars at the cracks to yield, which will eventually lead to the failure of the shear wall , seriously affecting the bearing safety of high-rise buildings. In order to delay the occurrence and expansion of cross-slant cracks in the concrete of the shear wall, in the current design method of the shear wall, the minimum reinforcement ratio and the maximum reinforcement ratio are strictly stipulated for the horizontal reinforcement and the vertical reinforcement in the shear wall. Although the ductility and seismic performance of the shear wall structure are improved to a certain extent, it cannot overcome the problem of wall cracking caused by the large main tensile stress, and the reinforcement distribution in the wall is dense, the spacing is small, and the steel consumption is large. , and will bring difficulties in wall concrete vibration construction.

Contents of the invention

The invention provides a shear wall structure configured with intersecting oblique internal prestress and a construction method thereof, which improves the seismic performance of the shear wall.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a shear wall structure configured with intersecting oblique internal prestressing, including the shear wall body, and the shear wall body is provided with horizontal steel bars for the shear wall body and the vertical direction steel bars of the shear wall, the upper left corner and the upper right corner of the shear wall body are respectively provided with shear wall tooth plates, and the shear wall tooth plates are equipped with prestressed tension end anchors, and the shear wall The prestressed anchorage end anchorages are respectively set at the lower left corner and the lower right corner of the body, and the cross oblique prestressed steel tendons are arranged between the diagonal prestressed anchorage end anchorages and the prestressed tension end anchorages, and the cross oblique prestressed There are intersecting oblique prestressed pipes on the outer side of the stress beam; the material of the shear wall body is concrete, the horizontal reinforcement of the shear wall body and the vertical reinforcement material of the shear wall body are ordinary steel bars, and the cross oblique The prestressed steel beams are made of high-strength prestressed steel wire bundles or steel strands, the crossed oblique prestressed pipes are made of metal corrugated pipes, iron pipes or plastic corrugated pipes, and the prestressed anchorage end anchors and prestressed tension end anchorages are made of cones. Shaped anchors, heading anchors or clip anchors.

The intersecting oblique prestressed pipe is left in the formwork of the shear wall body, and its placement position is guaranteed to be accurate through the binding connection with the horizontal reinforcement of the wall and the vertical reinforcement of the wall.

The cross oblique prestressed steel bundle is placed in the cross oblique prestressed pipe.

The anchorage at the prestressed anchorage end is left in the formwork of the shear wall body, and is fixed at the two corners adjacent to the bottom of the shear wall body after the concrete pouring of the shear wall is completed.

The shear wall tooth plate is a slot reserved at the top of the shear wall adjacent to the two corners, and the size of the slot matches the prestressed tension end anchorage used.

The prestressed tension end anchorage is placed in the tooth plate of the shear wall, and the prestressed tension is carried out when the concrete of the shear wall is poured and cured to the tensile strength. After the prestressed tension is completed, it is used in the tooth plate of the shear wall. Fine stone concrete filling and anchoring.

A construction method for a shear wall structure configured with intersecting oblique internal prestress, comprising the following construction steps:

(1) Set up the shear wall formwork and bind the ordinary steel bars on the wall

Set up the shear wall concrete formwork according to the design size, including the shear wall bottom formwork, side formwork, side formwork and shear wall tooth plate formwork, lay out and bind the ordinary steel bars of the shear wall body, including the horizontal direction steel bars of the wall body, the wall body For vertical reinforcement, if the shear wall is provided with side columns, the reinforcement of the side columns of the shear wall shall also be arranged and bound;

(2) Arrangement and installation of cross oblique prestressed pipelines

Arrange crossing oblique prestressed pipes along the diagonal direction of the shear wall body. The crossed oblique prestressed pipes are made of metal corrugated pipes, iron pipes or plastic corrugated pipes. Select a prestressed pipe with a suitable diameter. The prestressed pipe should be bound and connected with the ordinary steel bars on the wall to ensure accurate positioning of the pipe. The installation of the pipe should ensure that the interior is smooth, the line is smooth, and the joints are tightly connected;

(3) Prestressed steel beam penetration, installation of prestressed anchors

The prestressed steel beams are penetrated in the cross oblique prestressed pipe, and the cross oblique prestressed steel beams are made of high-strength prestressed steel wire bundles or steel strands. Install the prestressed anchoring end anchorage to the bottom of the prestressed steel beam, install the prestressed tensioning end anchorage on the top left and upper right corners of the shear wall body, and install the prestressed tension end anchorage at the top of the cross oblique prestressed steel beam. Conical anchors, heading anchors or clip anchors are used for anchors and prestressed tension end anchors. The anchors must be installed in accurate positions and fixed firmly. The anchor plate and the prestressed steel beam must be perpendicular to each other;

(4) Concrete pouring and maintenance of shear walls

The concrete of the shear wall is poured according to the design label, and the concrete is vibrated with an inserting vibrator to ensure that the concrete is dense and the concrete around the anchor pad is dense. When the shear wall is high, the layered pouring method is adopted. After the concrete is poured Adopt the corresponding maintenance plan according to the temperature and humidity of the construction environment;

(5) Prestressed tension, pipeline grouting, end anchoring

The shear wall concrete can be prestressed after curing to the strength and age that meet the design requirements. The prestress type is internal prestress, the prestress tension process is post tension method, and the prestress tension method is one end tension. Select appropriate tensioning equipment according to the prestressing degree calculated in the design, and synchronously stretch the crossed oblique prestressed steel bundles to the design tension control stress, and then perform pipeline grouting after the tensioning equipment is released, and the prestressed steel at the tensioning end The end of the beam is anchored, and finally the end of the tooth plate is sealed and anchored with fine stone concrete.

The beneficial effects of the present invention are:

(1) The main tensile stress in the plane of the shear wall body caused by the joint action of vertical and horizontal loads is borne by the prestressed steel tendons in the crossed oblique body, and the acting direction of the main tensile stress is the same as the arrangement direction of the prestressed steel tendons in the crossed oblique body Consistent, direct, concise and efficient force transmission, which greatly reduces the possibility of crossing oblique cracks in the shear wall body along the diagonal direction, and improves the lateral stiffness of the shear wall;

(2) After configuring the intersecting oblique prestressed steel tendons in the body, the shear wall is transformed from a common reinforced concrete structure to a partially prestressed reinforced concrete structure. This kind of structure does not crack the wall concrete under the permanent design condition and the frequent earthquake design condition , the stiffness of the shear wall does not degrade, and the bearing capacity of the shear wall does not decrease, which can meet the design requirements of the shear wall in the limit state of normal use and the limit state of bearing capacity;

(3) Under rare earthquake design conditions, cracks are allowed in the concrete of the wall body but the crack width does not exceed the specified limit, the stiffness of the shear wall does not degrade too much, and the bearing capacity of the shear wall does not decrease too much, which can ensure Bearing safety of the lower shear wall structure;

(4) The prestressed steel beams in the intersecting inclined body adopt the tensioning method of anchoring at one end and tensioning at the other end. The anchoring end is located at the bottom of the wall adjacent to the two corners, and the tensioning end is located at the top of the wall adjacent to the two corners. After the end of the tooth plate is sealed and anchored after the pulling is completed, the top of the shear wall is a plane, and the construction of the upper layer of shear wall can be continued;

(5) High-strength prestressed steel wire bundles and steel strand bundles can be used for crossing oblique prestressed steel beams. Metal corrugated pipes, iron pipes, and plastic corrugated pipes can be used for crossed oblique prestressed pipes. The stress-tension end anchorage can adopt conical anchors, heading anchors, and clip anchors. The above accessories are all products of finalized specifications. The construction technology is mature, the construction technology is reliable, and the construction quality is easy to guarantee;

(6) After the prestressed steel tendons in the cross oblique direction are configured, it can replace some ordinary steel bars in the horizontal and vertical directions of the wall, which can reduce the reinforcement ratio of ordinary steel bars and increase the reinforcement spacing of ordinary steel bars, which is convenient for wall concrete The vibrating construction is beneficial to improve the construction quality of wall concrete pouring.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is the top view of the present invention;

Fig. 3 is A-A sectional view of Fig. 2;

Fig. 4 is the B-B sectional view of Fig. 1;

Fig. 5 is a C-C sectional view of Fig. 1 .

Detailed ways

Embodiment: As shown in Figures 1-5, a shear wall structure with intersecting oblique internal prestressing includes a shear wall body 1, and a shear wall body horizontal direction is arranged inside the shear wall body 1 Steel bar 7 and vertical steel bar 8 of the shear wall body. Shear wall tooth plate 2 is respectively set at the upper left corner and upper right corner of the shear wall body 1. Prestressed tension end anchors are installed at the shear wall tooth plate 2. 6, the lower left corner and the lower right corner of the shear wall body 1 are respectively provided with prestressed anchorage end anchorages 5, and the diagonal prestressed anchorage end anchorages 5 and prestressed tension end anchorages 6 are provided with cross slope To the prestressed steel beam 4 and the crossed oblique prestressed pipe 3 is set on the outside of the crossed oblique prestressed steel beam 4; the material of the shear wall body 1 is concrete, and the horizontal direction steel bars 7 and shear force The material of the vertical steel bar 8 of the wall body is ordinary steel bar, the cross oblique prestressed steel beam 4 is made of high-strength prestressed steel wire bundle or steel strand wire bundle, and the crossed oblique prestressed pipe 3 is made of metal bellows, iron pipe or plastic Bellows, prestressed anchorage end anchorage 5, and prestressed tension end anchorage 6 adopt tapered anchors, heading anchors or clip anchors. The intersecting oblique prestressed pipe 3 is left in the formwork of the shear wall body, and its placement position is guaranteed to be accurate through binding connections with the horizontal reinforcement bars of the wall body and the vertical direction reinforcement bars of the wall body. The anchorage 5 at the prestressed anchorage end is left in the formwork of the shear wall body, and is fixed at two corners adjacent to the bottom of the shear wall body 1 after the concrete pouring of the shear wall is completed. The shear wall tooth plate 2 is a slot reserved at the top of the shear wall body 1 adjacent to the two corners, and the size of the slot matches the prestressed tension end anchorage 6 used. The prestressed tension end anchor 6 is placed in the tooth plate of the shear wall, and the prestressed tension is carried out when the concrete of the shear wall is poured and cured to the tensile strength. After the prestressed tension is completed, it is placed in the tooth plate of the shear wall Use fine stone concrete to fill the joints and seal the anchors.

A construction method for a shear wall structure configured with intersecting oblique internal prestress, comprising the following construction steps:

(1) Set up the shear wall formwork and bind the ordinary steel bars on the wall

Set up the shear wall concrete formwork according to the design size, including the shear wall bottom formwork, side formwork, side formwork and shear wall tooth plate formwork, lay out and bind the ordinary steel bars of the shear wall body, including the horizontal direction steel bars of the wall body, the wall body For vertical reinforcement, if the shear wall is provided with side columns, the reinforcement of the side columns of the shear wall shall also be arranged and bound;

(2) Arrangement and installation of cross oblique prestressed pipelines

Arrange crossing oblique prestressed pipes along the diagonal direction of the shear wall body. The crossed oblique prestressed pipes are made of metal corrugated pipes, iron pipes or plastic corrugated pipes. Select a prestressed pipe with a suitable diameter. The prestressed pipe should be bound and connected with the ordinary steel bars on the wall to ensure accurate positioning of the pipe. The installation of the pipe should ensure that the interior is smooth, the line is smooth, and the joints are tightly connected;

(3) Prestressed steel beam penetration, installation of prestressed anchors

The prestressed steel beams are penetrated in the cross oblique prestressed pipe, and the cross oblique prestressed steel beams are made of high-strength prestressed steel wire bundles or steel strands. Install the prestressed anchoring end anchorage to the bottom of the prestressed steel beam, install the prestressed tensioning end anchorage on the top left and upper right corners of the shear wall body, and install the prestressed tension end anchorage at the top of the cross oblique prestressed steel beam. Conical anchors, heading anchors or clip anchors are used for anchors and prestressed tension end anchors. The anchors must be installed in accurate positions and fixed firmly. The anchor plate and the prestressed steel beam must be perpendicular to each other;

(4) Concrete pouring and maintenance of shear walls

The concrete of the shear wall is poured according to the design label, and the concrete is vibrated with an inserting vibrator to ensure that the concrete is dense and the concrete around the anchor pad is dense. When the shear wall is high, the layered pouring method is adopted. After the concrete is poured Adopt the corresponding maintenance plan according to the temperature and humidity of the construction environment;

(5) Prestressed tension, pipeline grouting, end anchoring

The shear wall concrete can be prestressed after curing to the strength and age that meet the design requirements. The prestress type is internal prestress, the prestress tension process is post tension method, and the prestress tension method is one end tension. Select appropriate tensioning equipment according to the prestressing degree calculated in the design, and synchronously stretch the crossed oblique prestressed steel bundles to the design tension control stress, and then perform pipeline grouting after the tensioning equipment is released, and the prestressed steel at the tensioning end The end of the beam is anchored, and finally the end of the tooth plate is sealed and anchored with fine stone concrete.

In the present invention, in the wall body of the traditional ordinary shear wall structure, along two diagonal directions of the wall body plane, a group of internal prestressed steel beams are arranged respectively, and these two groups of internal prestressed steel beams are arranged in the wall body plane. The orientation is arranged in a diagonal crossing direction, which can directly bear and transmit the main tensile stress in the wall caused by the joint action of vertical and horizontal loads. The existence of prestressed steel tendons in the cross oblique body makes the shear wall change from ordinary reinforced concrete structure to partially prestressed reinforced concrete structure. By applying appropriate prestress, the wall concrete can be used in permanent design conditions and frequent earthquake design conditions. It is always under compression, which can ensure that the wall concrete will not crack under the action of wind load and fortification intensity earthquake; Cracks appear in the body concrete, but the crack width will not exceed the specified limit, so as to ensure that the stiffness of the shear wall will not be excessively degraded, and the bearing capacity will not be excessively reduced, ensuring the bearing safety of high-rise buildings under rare earthquakes. The existence of the intersecting oblique prestressed steel beams in the body can also reduce the reinforcement ratio of the horizontal steel bars and vertical steel bars in the wall body, reduce the difficulty of wall concrete vibrating construction, and improve the construction quality of wall concrete.

Claims (6)

1. A shear wall structure configured with intersecting oblique internal prestressing, characterized in that: it includes a shear wall body, the shear wall body is provided with a horizontal direction steel bar of the shear wall body and a vertical direction of the shear wall body Straight direction reinforcement, the upper left corner and the upper right corner of the shear wall body are respectively equipped with shear wall tooth plates, and the shear wall tooth plates are equipped with prestressed tension end anchors, and the lower left and right corners of the shear wall body The prestressed anchorage end anchorages are set respectively, and the cross oblique prestressed steel beams are set between the diagonal prestressed anchorage end anchorages and the prestressed tension end anchorages, and the cross oblique prestressed steel beams are sleeved outside the cross oblique prestressed steel beams. Crossing oblique prestressed pipes; the material of the shear wall is concrete, the horizontal reinforcement of the shear wall and the vertical reinforcement of the shear wall are ordinary steel, and the cross oblique prestressed steel beams are made of high-strength Prestressed steel wire bundles or steel strand bundles, metal corrugated pipes, iron pipes or plastic corrugated pipes for crossing oblique prestressed pipes, tapered anchors, heading anchors or anchors for prestressed anchoring ends and prestressed tensioning ends Clip anchor. 2. The shear wall structure configured with intersecting oblique internal prestress according to claim 1 is characterized in that: the intersecting oblique prestressed pipeline is left in the formwork of the shear wall body, and is passed through the horizontal direction steel bar of the wall body, The binding connection between the steel bars in the vertical direction of the wall ensures that the placement position is accurate. 3. The shear wall structure configured with intersecting oblique internal prestress according to claim 2 is characterized in that: the anchorage at the prestressed anchorage end is left in the formwork of the shear wall body, and after the concrete pouring of the shear wall is completed It is fixed at the bottom of the shear wall adjacent to the two corners. 4. According to any one of claims 1-3, the shear wall structure configured with intersecting oblique internal prestressing is characterized in that: the tooth plate of the shear wall is located at the top of the shear wall adjacent to the two corners The size of the reserved slot matches the prestressed tension end anchorage used. 5. The shear wall structure configured with intersecting oblique internal prestress according to claim 4 is characterized in that: the prestress tension end anchorage is placed in the tooth plate of the shear wall, and the concrete pouring of the shear wall is completed and completed. Prestressed tensioning is carried out when the tensile strength is maintained. After the prestressed tensioning is completed, fine stone concrete is used to seal the joints and anchors in the tooth plate of the shear wall. 6. A construction method of a shear wall structure configured with cross oblique internal prestress, characterized in that: comprising the following construction steps: (1) Set up the shear wall formwork and bind the ordinary steel bars on the wall Set up the shear wall concrete formwork according to the design size, including the shear wall bottom formwork, side formwork, side formwork and shear wall tooth plate formwork, lay out and bind the ordinary steel bars of the shear wall body, including the horizontal direction steel bars of the wall body, the wall body For vertical reinforcement, if the shear wall is provided with side columns, the reinforcement of the side columns of the shear wall shall also be arranged and bound; (2) Arrangement and installation of cross oblique prestressed pipelines Arrange crossing oblique prestressed pipes along the diagonal direction of the shear wall body. The crossed oblique prestressed pipes are made of metal corrugated pipes, iron pipes or plastic corrugated pipes. Select a prestressed pipe with a suitable diameter. The prestressed pipe should be bound and connected with the ordinary steel bars on the wall to ensure accurate positioning of the pipe. The installation of the pipe should ensure that the interior is smooth, the line is smooth, and the joints are tightly connected; (3) Prestressed steel beam penetration, installation of prestressed anchors The prestressed steel beams are penetrated in the cross oblique prestressed pipe, and the cross oblique prestressed steel beams are made of high-strength prestressed steel wire bundles or steel strands. Install the prestressed anchoring end anchorage to the bottom of the prestressed steel beam, install the prestressed tensioning end anchorage on the top left and upper right corners of the shear wall body, and install the prestressed tension end anchorage at the top of the cross oblique prestressed steel beam. Conical anchors, heading anchors or clip anchors are used for anchors and prestressed tension end anchors. The anchors must be installed in accurate positions and fixed firmly. The anchor plate and the prestressed steel beam must be perpendicular to each other; (4) Concrete pouring and maintenance of shear walls The concrete of the shear wall is poured according to the design label, and the concrete is vibrated with an inserting vibrator to ensure that the concrete is dense and the concrete around the anchor pad is dense. When the shear wall is high, the layered pouring method is adopted. After the concrete is poured Adopt the corresponding maintenance plan according to the temperature and humidity of the construction environment; (5) Prestressed tension, pipeline grouting, end anchoring The shear wall concrete can be prestressed after curing to the strength and age that meet the design requirements. The prestress type is internal prestress, the prestress tension process is post tension method, and the prestress tension method is one end tension. Select appropriate tensioning equipment according to the prestressing degree calculated in the design, and synchronously stretch the crossed oblique prestressed steel bundles to the design tension control stress, and then perform pipeline grouting after the tensioning equipment is released, and the prestressed steel at the tensioning end The end of the beam is anchored, and finally the end of the tooth plate is sealed and anchored with fine stone concrete.

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