CN216664568U - Damping and shock-absorbing assembly type connecting node for prefabricated shear wall - Google Patents
Damping and shock-absorbing assembly type connecting node for prefabricated shear wall Download PDFInfo
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- CN216664568U CN216664568U CN202023110498.7U CN202023110498U CN216664568U CN 216664568 U CN216664568 U CN 216664568U CN 202023110498 U CN202023110498 U CN 202023110498U CN 216664568 U CN216664568 U CN 216664568U
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Abstract
The utility model discloses a damping and shock-absorbing assembly type connecting node for a prefabricated shear wall, which comprises pre-embedded plates, wherein the pre-embedded plates are pre-embedded on the cross sections of the upper and lower connecting ends of the prefabricated concrete shear wall through welding studs, and a shock-absorbing support is arranged between the two pre-embedded plates; the damping support comprises two mounting plates, a support shaft and damping filler, the two mounting plates are respectively connected with an upper embedded plate and a lower embedded plate through studs, the two ends of the support shaft are respectively connected with the upper mounting plate and the lower mounting plate, the damping filler is arranged between the two mounting plates, and the support shaft is made of a soft steel pipe; by adopting the fabricated shear wall connecting node, cast-in-place is not needed, the construction period and cost are saved, and the environment is protected; adopt the assembled shear force wall connected node of this patent, can realize the efficiency of damping, it can be better to promote anti-seismic performance.
Description
Technical Field
The utility model relates to the field of prefabricated shear walls, in particular to a damping and shock-absorbing assembly type connecting node for a prefabricated shear wall.
Background
The fabricated building is a building assembled by prefabricated parts on a construction site. The assembly type building is a great improvement of a construction mode, and is beneficial to saving resources and energy, reducing pollution and improving labor production efficiency and quality safety level. In the fabricated concrete structure, the shear wall connection mainly adopts a grouting sleeve. The main principle is as follows: when the prefabricated part is hoisted, the opening end of the grouting sleeve is aligned to and sleeved on the reserved steel bar extending out of the lower-layer wall body, the position and the angle of the prefabricated part are adjusted, and the gap at the concrete joint is sealed. And after the bin is sealed, grouting material is injected from the grout inlet until the grouting material flows out from the grout outlet without bubbles, the grout outlet and the grout inlet are sequentially plugged by a rubber plug, and the longitudinal steel bars are connected into a whole after the grouting material reaches a certain strength. The problems existing in the prior art are as follows: the construction period of sleeve connection is long, the construction process is not easy to control, and the construction period delay and the cost increase are easy to cause; the phenomena of slurry leakage and hollow clamping are easy to occur in sleeve grouting, and the compactness is difficult to detect; the sleeve grouting construction site is still wet operation, and the environmental protection advantage of the fabricated building cannot be fully reflected.
SUMMERY OF THE UTILITY MODEL
This section is for the purpose of summarizing some aspects of embodiments of the utility model and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the application, and such simplifications or omissions are not intended to limit the scope of the utility model.
The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.
Therefore, the technical problems to be solved by the utility model are that the sleeve connection construction period is long, the construction process is not easy to control, and the construction period is easy to delay and the cost is easy to increase; the phenomena of slurry leakage and hollow clamping are easy to occur in sleeve grouting, and the compactness is difficult to detect; the sleeve grouting construction site is still wet operation, and the environmental protection advantage of the fabricated building cannot be fully reflected.
In order to solve the technical problems, the utility model provides the following technical scheme: a damping and shock-absorbing assembly type connecting node for a prefabricated shear wall comprises pre-embedded plates, wherein the pre-embedded plates are pre-embedded on the sections of the upper connecting end and the lower connecting end of a prefabricated concrete shear wall through welding studs, and a shock-absorbing support is arranged between the two pre-embedded plates;
the damping support comprises two mounting plates, a support shaft and damping filler, the two mounting plates are respectively connected with an upper embedded plate and a lower embedded plate through studs, the two ends of the support shaft are respectively connected with the upper mounting plate and the lower mounting plate, the damping filler is arranged between the two mounting plates, and the support shaft is made of a soft steel pipe;
the shock absorption filling is formed by alternately laminating steel partition plates and rubber layers.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components in percentage by weight: the supporting shaft is fixedly connected with connectors at two ends, the mounting plate is provided with a connecting hole, and the connectors are embedded into the connecting hole.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components in percentage by weight: the connector is provided with a sliding groove along the radial direction, a clamping block is arranged in the sliding groove, a limiting groove is arranged in the connecting hole, and one end of the clamping block can be embedded into the limiting groove.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components in percentage by weight: two symmetrical clamping blocks are arranged in the sliding groove, and a first spring is arranged between the two clamping blocks.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components: the fixture block is provided with a boss, the connector is axially provided with an adjusting hole connected with the sliding groove, an adjusting part is arranged in the adjusting hole and comprises an adjusting disc, an adjusting groove is formed in the adjusting disc, and the boss is embedded into the adjusting groove;
the adjusting groove is a long groove, the width of the adjusting groove is consistent with the diameter of the boss, and extension lines of connecting lines at two ends of the adjusting groove do not pass through the circle center of the adjusting disc.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components in percentage by weight: the adjusting piece further comprises an adjusting column, a spiral groove is formed in the adjusting column, a pressing piece is arranged in the adjusting hole, the pressing piece is provided with a through hole and sleeved on the adjusting column, a protrusion is arranged in the through hole, and the protrusion is embedded into the spiral groove.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components in percentage by weight: the circumference of the pressing piece is provided with a limiting block, a guide groove is axially arranged in the adjusting hole, the limiting block is positioned in the guide groove, and the opening of the adjusting hole shrinks towards the circle center to form a limiting ring; a second spring is arranged between the adjusting disc and the pressing piece.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components in percentage by weight: the bottom of the sliding groove is provided with a guide protrusion along the radial direction of the connector, the corresponding position of the fixture block and the guide protrusion is provided with a guide groove, and the guide protrusion is embedded into the guide groove.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components: the guide protrusion is provided with a limiting groove along the radial direction of the connector, a limiting protrusion is arranged in the guide groove, and the limiting protrusion is embedded into the limiting groove.
As a preferred scheme of the damping and shock-absorbing assembly type connecting node for the prefabricated shear wall, the damping and shock-absorbing assembly type connecting node comprises the following components in percentage by weight: the mounting plate is provided with bolt holes, and the bolt holes are connected with the embedded plates through welding bolts.
The utility model has the beneficial effects that: by adopting the fabricated shear wall connecting node, cast-in-place is not needed, the construction period and cost are saved, and the environment is protected; adopt the assembled shear force wall connected node of this patent, can realize the efficiency of damping, it can be better to promote anti-seismic performance. The connecting node is a dry construction process, has simple and convenient construction steps, can improve the construction efficiency, saves the construction period, is convenient to inspect, has superior mechanical property, not only has the functions of resisting vibration and reducing energy, but also has certain shearing resistance. Meanwhile, the connecting nodes are convenient to assemble and disassemble, and the working efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic structural diagram of an installation position of a damping and shock-absorbing fabricated connection node for a prefabricated shear wall according to an embodiment of the utility model;
FIG. 2 is a schematic structural diagram of a shock-absorbing support in a damping and shock-absorbing assembly type connection node for a prefabricated shear wall according to an embodiment of the utility model;
FIG. 3 is a schematic structural diagram of a shock-absorbing support in a damping and shock-absorbing fabricated connecting node for a prefabricated shear wall according to an embodiment of the utility model;
FIG. 4 is a partially enlarged structural view of a shock-absorbing support in a damping and shock-absorbing fabricated connecting node for a prefabricated shear wall according to an embodiment of the utility model;
fig. 5 is an exploded view of a shock-absorbing support in a damping shock-absorbing fabricated connecting node for a prefabricated shear wall according to an embodiment of the utility model.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Furthermore, the reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the utility model. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1-2, the embodiment provides a damping and shock-absorbing assembly type connection node for a precast shear wall, which includes two pre-embedded plates 100 and a shock-absorbing support 200, wherein the pre-embedded plates 100 are pre-embedded on the cross sections of the upper and lower connection ends of the precast concrete shear wall through welding studs, and the shock-absorbing support 200 is installed between the two pre-embedded plates 100; the damping support 200 comprises two mounting plates 201, a support shaft 202 and damping fillers 203, wherein the two mounting plates 201 are respectively connected with the upper embedded plate 100 and the lower embedded plate 100 through studs, one ends of the studs are fixed in the precast concrete shear wall, and the other ends of the studs penetrate through the embedded plates 100 and then are connected with the mounting plates 201.
Furthermore, two ends of a support shaft 202 are respectively connected with an upper mounting plate 201 and a lower mounting plate 201, a shock absorption filling 203 is arranged between the two mounting plates 201, the support shaft 202 penetrates through the shock absorption filling 203, and the support shaft 202 is made of a soft steel pipe and has certain shearing resistance; wherein the damper filler 203 is formed by alternately laminating steel spacers 203a and rubber layers 203 b.
Preferably, the two ends of the supporting shaft 202 are fixedly connected with the connectors 204, the mounting plate 201 is provided with a connecting hole 201a, and the connectors 204 are embedded into the connecting hole 201 a.
The connecting joint is used in a dry construction process, has simple and convenient construction steps, can improve the construction efficiency, saves the construction period, is convenient to inspect, has excellent mechanical property, not only has the functions of resisting vibration and reducing energy, but also has certain shearing resistance.
Example 2
Referring to fig. 1 to 5, a second embodiment of the present invention is based on the previous embodiment, and is different from the previous embodiment in that:
the connecting head 204 is provided with a sliding groove 204a along the radial direction, a clamping block 205 is arranged in the sliding groove 204a, a limiting groove 201b is arranged in the connecting hole 201a, and one end of the clamping block 205 can be embedded into the limiting groove 201 b. One end of the clamping block 205 extending out of the sliding groove 204a is in the shape of a right triangle, wherein the right-angle side can contact with the side surface of the limiting groove 201b to limit the connector 204 to be separated from the connecting hole 201 a.
Preferably, two symmetrical latches 205 are disposed in the sliding slot 204a, and a first spring 206 is disposed between the two latches 205. The elastic force of the spring can extend the latch 205 out of the slide groove 204 a.
Furthermore, a boss 205a is arranged on the fixture block 205, an adjusting hole 204b connected with the sliding groove 204a is axially arranged on the connector 204, an adjusting piece 207 is installed in the adjusting hole 204b, the adjusting piece 207 comprises an adjusting disc 207a, an adjusting groove 207b is arranged on the adjusting disc 207a, and the boss 205a is embedded in the adjusting groove 207 b; the adjustment dial 207a can rotate within the adjustment aperture 204b,
it should be noted that the adjustment groove 207b is a long groove, the groove width is consistent with the diameter of the boss 205a, and the extension line of the connection line at the two ends of the adjustment groove 207b does not pass through the center of the adjustment disc 207 a. That is, the connecting line between the end of the adjusting slot 207b far from the center of the adjusting disc 207a and the end close to the center of the adjusting disc 207a is not coincident with any radius of the adjusting disc 207a, that is, when the adjusting disc 207a is operated to rotate, the boss 205a moves in the adjusting slot 207 b. When moving, the latch 205 can slide in the sliding slot 204 a.
Further, the adjusting member 207 further includes an adjusting column 207c, the adjusting column 207c is concentrically disposed with the adjusting disc 207a, and an end surface thereof is connected, wherein a spiral groove 207d is disposed on the adjusting column 207c, a trend of the spiral groove 207d is spiral, a pressing member 208 is disposed in the adjusting hole 204b, the pressing member 208 is provided with a through hole 208a and is sleeved on the adjusting column 207c, a protrusion 208b is disposed in the through hole 208a, the protrusion 208b is embedded in the spiral groove 207d, when the pressing member 208 is operated to move along the axial direction, the protrusion 208b and the spiral groove 207d are matched to enable the adjusting column 207c to rotate, and further, the adjusting disc 207a is driven to rotate.
Further, the pressing member 208 is circumferentially provided with a stop block 208c, the adjusting hole 204b is internally provided with a guide groove 204c along the axial direction, and the stop block 208c is positioned in the guide groove 204c, so that the pressing member 208 can only move along the axial direction but cannot rotate. Preferably, the opening of the adjusting hole 204b is contracted toward the center of the circle to form a limiting ring 204d, and the limiting ring 204d prevents the pressing piece 208 from being separated. Wherein, a second spring 209 is provided between the adjustment disc 207a and the pressing piece 208. The pressing piece 208 is located away from the latch 205 by the elastic force of the second spring 209.
Preferably, a guide protrusion 204e is disposed at the bottom of the sliding groove 204a along the radial direction of the connector 204, a guide groove 205b is disposed at a position of the latch 205 corresponding to the guide protrusion 204e, and the guide protrusion 204e is inserted into the guide groove 205b, so that the latch 205 moves along the radial direction of the connector 204 in the sliding groove 204 a.
Furthermore, a limiting groove 204f is formed in the guide protrusion 204e along the radial direction of the connector 204, a limiting protrusion 205c is formed in the guide groove 205b, and the limiting protrusion 205c is embedded in the limiting groove 204f to prevent the fixture block 205 from being separated from the sliding groove 204 a.
Further, the mounting plate 201 is provided with a bolt hole 201c, and the bolt hole 201c is connected with the embedded plate 100 through a welding bolt.
In the specific implementation of the embodiment, the shock mount 200 is assembled, and after the support shaft 202 passes through the shock absorption filler 203 with a proper thickness, both ends of the support shaft are connected with the mounting plate 201; specifically, the connecting head 204 is pressed into the connecting hole 201a, the fixture block 205 extends out of the sliding groove 204a and is embedded into the limiting groove 201b for fixing, if the thickness of the shock absorption filling 203 is not appropriate at this time, the mounting plate 201 needs to be detached, specifically, the pressing piece 208 is operated by a tool to move towards the fixture block 205, at this time, the protrusion 208b is matched with the spiral groove 207d to enable the adjusting column 207c to rotate, and the boss 205a moves in the adjusting groove 207 b. When the installation plate is moved, the fixture block 205 can slide in the sliding groove 204a, and then the fixture block 205 is contracted into the sliding groove 204a, so that the installation plate 201 can be taken down to adjust the height of the shock absorption filling 203.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the utility model, or those unrelated to enabling the utility model).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a damping assembled connected node that subtracts vibrating for precast shear wall which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the prefabricated concrete shear wall comprises embedded plates (100), wherein the embedded plates (100) are embedded in the cross sections of the upper and lower connecting ends of the prefabricated concrete shear wall through welding studs, and a damping support (200) is arranged between the two embedded plates (100);
the shock absorption support (200) comprises two mounting plates (201), a support shaft (202) and shock absorption fillers (203), the two mounting plates (201) are respectively connected with an upper embedded plate and a lower embedded plate (100) through studs, two ends of the support shaft (202) are respectively connected with the upper mounting plate and the lower mounting plate (201), the shock absorption fillers (203) are arranged between the two mounting plates (201), and the support shaft (202) is made of soft steel pipes;
the shock absorption filling (203) is formed by alternately laminating steel clapboards (203 a) and rubber layers (203 b).
2. The damping and shock-absorbing fabricated connection node for a prefabricated shear wall as claimed in claim 1, wherein: support shaft (202) both ends fixedly connected with connector (204), mounting panel (201) are provided with connecting hole (201 a), connector (204) embedding in connecting hole (201 a).
3. The damping and shock-absorbing fabricated connection node for a prefabricated shear wall as claimed in claim 2, wherein: the connecting head (204) is provided with a sliding groove (204 a) along the radial direction, a clamping block (205) is arranged in the sliding groove (204 a), a limiting groove (201 b) is arranged in the connecting hole (201 a), and one end of the clamping block (205) can be embedded into the limiting groove (201 b).
4. The damping and shock-absorbing fabricated connection node for precast shear walls according to claim 3, wherein: two symmetrical fixture blocks (205) are arranged in the sliding groove (204 a), and a first spring (206) is arranged between the two fixture blocks (205).
5. The damping and shock-absorbing fabricated connection node for precast shear walls according to claim 4, wherein: a boss (205 a) is arranged on the fixture block (205), an adjusting hole (204 b) connected with the sliding groove (204 a) is axially arranged on the connector (204), an adjusting piece (207) is installed in the adjusting hole (204 b), the adjusting piece (207) comprises an adjusting disc (207 a), an adjusting groove (207 b) is arranged on the adjusting disc (207 a), and the boss (205 a) is embedded into the adjusting groove (207 b);
the adjusting groove (207 b) is a long groove, the width of the groove is consistent with the diameter of the boss (205 a), and extension lines of connecting lines at two ends of the adjusting groove (207 b) do not pass through the circle center of the adjusting disc (207 a).
6. The damping and shock-absorbing fabricated connection node for precast shear walls according to claim 5, wherein: the adjusting piece (207) further comprises an adjusting column (207 c), a spiral groove (207 d) is formed in the adjusting column (207 c), a pressing piece (208) is arranged in the adjusting hole (204 b), the pressing piece (208) is provided with a through hole (208 a) and sleeved on the adjusting column (207 c), a protrusion (208 b) is arranged in the through hole (208 a), and the protrusion (208 b) is embedded into the spiral groove (207 d).
7. The damping and shock-absorbing fabricated connection node for precast shear walls according to claim 6, wherein: a limiting block (208 c) is arranged on the circumference of the pressing piece (208), a guide groove (204 c) is arranged in the adjusting hole (204 b) along the axial direction, the limiting block (208 c) is positioned in the guide groove (204 c), and an opening of the adjusting hole (204 b) shrinks towards the circle center to form a limiting ring (204 d); a second spring (209) is arranged between the adjusting disk (207 a) and the pressing piece (208).
8. The damping and shock-absorbing fabricated connection node for precast shear walls according to claim 7, wherein: the bottom of the sliding groove (204 a) is provided with a guide protrusion (204 e) along the radial direction of the connector (204), a guide groove (205 b) is formed in the position, corresponding to the guide protrusion (204 e), of the clamping block (205), and the guide protrusion (204 e) is embedded into the guide groove (205 b).
9. The damping and shock-absorbing fabricated connection node for precast shear walls according to claim 8, wherein: the guide protrusion (204 e) is provided with a limiting groove (204 f) along the radial direction of the connector (204), the guide groove (205 b) is internally provided with a limiting protrusion (205 c), and the limiting protrusion (205 c) is embedded into the limiting groove (204 f).
10. The damping and shock-absorbing fabricated connection node for the prefabricated shear wall as claimed in claim 9, wherein: the mounting plate (201) is provided with bolt holes (201 c), and the bolt holes (201 c) are connected with the embedded plate (100) through welding bolts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023110498.7U CN216664568U (en) | 2020-12-22 | 2020-12-22 | Damping and shock-absorbing assembly type connecting node for prefabricated shear wall |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023110498.7U CN216664568U (en) | 2020-12-22 | 2020-12-22 | Damping and shock-absorbing assembly type connecting node for prefabricated shear wall |
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| CN216664568U true CN216664568U (en) | 2022-06-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627378A (en) * | 2020-12-22 | 2021-04-09 | 中国建筑第四工程局有限公司 | Damping and shock-absorbing assembly type connecting node for prefabricated shear wall |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627378A (en) * | 2020-12-22 | 2021-04-09 | 中国建筑第四工程局有限公司 | Damping and shock-absorbing assembly type connecting node for prefabricated shear wall |
| CN112627378B (en) * | 2020-12-22 | 2024-08-23 | 中国建筑第四工程局有限公司 | Damping vibration absorption assembled connecting node for prefabricated shear wall |
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