Composite material and capsule combined anchoring method for building thermal insulation layer

Abstract

A composite material and capsule combined anchoring method for a building thermal insulation layer relates to a technology for anchoring a thermal insulation layer on a wall, an FRP rib anchor bolt is used as an anchor bolt main body structure which penetrates through a thermal insulation functional layer and goes deep into a foundation wall, a capsule is arranged at the tip end of the FRP rib anchor bolt, a binder is wrapped in the capsule, and in the process that the FRP rib anchor bolt enters the wall, the FRP rib anchor bolt is fixed on the wall. The capsule is punctured by the top end of the FRP rib anchor bolt, the anchor bolt assembly is guided into the bottom hole (10) in the front direction of the capsule (8) until the tray (4) supports the heat preservation layer (2), at the moment, the distance (J) between the top end of the FRP rib anchor bolt and the bottom of the bottom hole (10) is smaller than the length (K) of the capsule (8), the capsule (8) is broken, part of the adhesive (9) flows into the gap between the FRP rib anchor bolt body and the bottom hole (10), then the adhesive is cured, and the heat preservation layer (2) is formed. And the FRP rib anchor bolt is firmly bonded with the bottom hole (10).

Description

Technical Field

[0001] The present invention belongs to the technical field of building insulation layers, and particularly relates to an anchoring method for a building insulation layer combining a composite material and a capsule. Background Art

[0002] In 1986, China promulgated and began to implement the first industry standard aiming to promote building energy conservation work, "Design Standard for Energy Conservation of Civil Buildings (Heating Residential Buildings Part)" (JGJ26 - 86), marking the official start of China's building energy conservation work. Currently, nearly 1 - 2 billion square meters of new urban and rural buildings are constructed annually across the country, among which public buildings account for about 300 - 400 million square meters. Existing buildings exceed 60 billion square meters, and more than 50% are high - energy - consuming buildings.

[0003] At present, building energy consumption in China has approached 1 / 4 of the total national energy consumption and will gradually increase to 1 / 3. Therefore, building insulation layers show a trend of getting thicker and having higher technical content.

[0004] To ensure the safety of buildings, necessary fire - prevention measures must be taken to make them have a certain fire resistance, so that even in case of a fire, too much loss will not be caused. Usually, the fire resistance of a building is represented by the fire - resistance rating. China's current code selects the floor slab as the benchmark for determining the fire - resistance limit rating. The "Code for Fire Protection Design of High - Rise Civil Buildings" divides the fire - resistance ratings of high - rise civil buildings into Class I and Class II; the "Code for Fire Protection Design of Buildings" is divided into Class I, Class II, Class III, and Class IV, with Class I being the highest and Class IV being the lowest.

[0005] Currently, there is no specific requirement for the waterproof grade of building exterior walls. Building waterproofing is generally based on the understanding of the design institute and refers to four categories of building waterproofing codes to design the waterproofing of the wall. However, most residential exterior walls are designed with special waterproofing. The code divides buildings into four categories as follows: Category I buildings are particularly important buildings, such as museums, libraries, memorial halls, exhibition halls, archives, and particularly important laboratories. The waterproof service life is 25 years, and the waterproofing requirement is: three or more layers of waterproofing; Category II buildings are important buildings. Such as airport terminals, railway station waiting halls, star - rated hotels, cinemas, hospitals, large shopping malls, and warehouses storing important materials. The waterproof service life is 15 years, and the waterproofing requirement is: two layers of waterproofing; Category III buildings are ordinary industrial and civil buildings. Such as office buildings, residences, industrial factories, school buildings, and general warehouses. The waterproof service life is 10 years; the waterproofing requirement is: one layer of waterproofing.

[0006] Although domestic and foreign researchers have been committed to breaking through the technical problems of weight - reduction, flame - retardancy, and cost - controllable insulation materials, there is currently no single material on the market that can simultaneously meet the use requirements of the external insulation layer of high - rise buildings in the northern region in terms of energy - saving insulation (75% or 85% energy - saving standard), safety fire - prevention, waterproofing, long - term stability, and cost.

[0007] The only solution is to laminate functional layers with higher standards for functions such as thermal insulation, waterproofing, and fireproofing into a composite functional layer. However, this significantly increases the weight of the composite functional layer.

[0008] The conventional thermal insulation layer installation technology is as follows: drill holes in the wall, insert plastic expansion tubes with trays into the holes, and then drive steel nails into the reserved holes in the center of the plastic expansion tubes to expand the plastic expansion tubes, squeezing the hole walls on the wall to achieve anchoring by friction, with the steel nails mainly bearing the tensile and shear loads.

[0009] With the significant increase in the weight of the composite functional layer, several problems have emerged with the plastic expansion tube + steel nail method: First of all, the steel nails must extend from near the outermost part of the composite thermal insulation layer into the interior of the wall, otherwise they cannot effectively bear the tensile and shear loads. However, the thermal conductivity of the steel nails reaches k 钢 = 40 - 50 W / (m·K), with a diameter of 6 mm. For every square meter of the composite thermal insulation layer, 10 steel nails are required. Then, the cross-sectional area of the steel nails per square meter of the exterior wall reaches S 钢 = 0.0002826 m 2 , and the heat transfer through the steel nails per square meter of the composite thermal insulation layer: Q 钢 = k 钢 × S 钢 = 0.0113 - 0.01413 (W·m) / K; the thermal conductivity of the insulating polystyrene board k 苯 = 0.03 W / (m·K), and the heat transfer through the insulating polystyrene board per square meter of the composite thermal insulation layer: Q 苯 = k 苯 × 1 = 0.03 (W·m) / K. The additional heat loss caused by the steel nails Q 钢 / Q 苯 = 37.67 - 47.1%, that is, the presence of the steel nails increases the energy loss of the modern building exterior wall thermal insulation layer by 37.67 - 47.1%. One of China's carbon reduction goals is to achieve energy conservation of 75% - 95% for new and existing buildings. The plastic expansion tube + steel nail thermal insulation layer installation technology seriously hinders the achievement of this goal.

[0010] Secondly, the anchoring force of the plastic expansion tube + steel nail method can no longer meet the requirements, with a small tensile strength. The current Chinese standard stipulates that the tensile strength of a single anchor bolt F ≥ 0.6 KN. According to the existing technology, to achieve energy conservation of 75% - 95% in buildings, the total thickness of the composite thermal insulation layer needs to reach approximately 250 mm, and the total anchoring force of 10 anchor bolts per square meter is 6 KN, which is difficult to be stable in the long term. The weak point lies in the insufficient strength of the all-plastic tray integrally formed with the plastic expansion tube.

[0011] Secondly, both the plastic expansion tube and the all-plastic tray integrally formed therewith are products made of thermoplastic polymer materials. After being stressed, creep (a phenomenon in which strain continuously increases over time) will occur. Creep causes the plastic method to continuously deform and the load-bearing capacity to decrease. Long-term service will result in aging, which makes its strength lower and lower. After a certain number of years, the strength will decline severely and the anchoring will fail. The composite functional layer is prone to phenomena such as peeling, causing economic losses and endangering environmental safety, resulting in the inability of the composite functional layer to have the same lifespan as the building, etc.

[0012] In modern times, the requirements for energy conservation in northern China are getting higher and higher. The indicators are generally based on a 490-mm-thick brick-concrete solid wall. If the heat dissipation loss of the energy-saving building wall is reduced by 75%, it is called 75% energy conservation, and so on.

[0013] FRP reinforcement bars, which are composite materials with a thermosetting resin as the matrix and fibers as the reinforcing phase, include: GFRP reinforcement bars are composite materials with a thermosetting resin as the matrix and glass fibers as the reinforcing phase; AFRP reinforcement bars are composite materials with a thermosetting resin as the matrix and aramid fibers as the reinforcing phase; BFRP reinforcement bars are composite materials with a thermosetting resin as the matrix and basalt fibers as the reinforcing phase.

[0014] GFRP reinforcement bars are the most commonly used and have the highest cost performance. Its thermal conductivity is k G = 0.712 - 1.34 W / (m·K). If the diameter of the reinforcement bar anchor bolt is 10 mm and 10 FRP reinforcement bar anchor bolts are required per square meter of the insulation layer, then the cross-sectional area occupied by GFRP reinforcement bars per square meter of the exterior wall is S G = 0.000785 m 2 , 1 m 2 The heat transfer caused by the GFRP reinforcement bar anchor bolts in the wall is: Q G = k G × S G = 0.0006 - 0.0011 (W·m) / K; the thermal conductivity of the insulating polystyrene board is k 苯 = 0.03 W / (m·K), 1 m 2 The heat transfer of the insulating polystyrene board in the wall is: Q 苯 = k 苯 × S 苯 = 0.03 (W·m) / K. The additional heat loss Q G / Q 苯 = 2 - 3.7%. Obviously, using GFRP reinforcement bar anchor bolts to replace the insulation layer anchoring method of plastic expansion tubes + steel nails is of decisive significance for whether 75% - 95% energy conservation in modern buildings can be achieved.

[0015] CN 201921912117.1 discloses "External Wall Thermal Insulation Device for Building Energy Saving Transformation". The diameters of both the installation hole 11 and the through hole 15 are 10 millimeters, and the fixing bolt 8 is threadedly connected to the thermal insulation board 2, the mesh cloth board 3, and the moisture absorption and sound insulation board 4. The fixing bolt 8 is inserted into the interior from the installation hole 11 and sequentially passes through the moisture absorption and sound insulation board 4, the polystyrene board 12, the polyurethane board 13, the mesh cloth board 3, and the extruded polystyrene board 14 in a spiral manner and extends into the interior of the wall 1, and then is fixed to it in a threaded manner.

[0016] CN 01103568.4 discloses "External Wall Hanging Board External Thermal Insulation Energy Saving Technology". One of the technical features is the use of non-metallic expansion bolts (abbreviated as FP bolts), and SBS (engineering plastic) is selected for the bolt, nut, and washer, and another polyethylene material is used for the expansion tube.

[0017] This design selects SBS (engineering plastic) for the bolt, which can solve the "cold bridge effect" problem. However, the low strength, low stiffness, and easy aging problems of SBS itself determine that it cannot meet the needs of modern composite thermal insulation layer anchoring. Summary of the Invention

[0018] The key to anchoring the composite thermal insulation layer is to avoid using materials with high thermal conductivity in the anchor bolt on the basis of ensuring firm and durable bonding with the wall, and to minimize the heat conduction cross-sectional area of the anchor bolt as much as possible, so as to reduce the heat dissipation loss caused by the anchor bolt and achieve building energy saving.

[0019] Therefore, this case designs a method for anchoring the thermal insulation layer using composite materials.

[0020] For example: Replace the current method of plastic expansion tube + steel nail with FRP reinforcement bars to make FRP reinforcement bar anchor bolts.

[0021] In order to increase the bonding strength between the FRP reinforcement bar anchor bolt and the wall, a capsule is provided at the tip of the FRP reinforcement bar anchor bolt, and an adhesive is wrapped in the capsule. During the process of the FRP reinforcement bar anchor bolt entering the wall, the capsule is punctured by the top of the FRP reinforcement bar anchor bolt, and the adhesive enters between the FRP reinforcement bar anchor bolt and the bottom hole of the wall. Subsequently, the adhesive solidifies and firmly bonds the FRP reinforcement bar anchor bolt to the bottom hole of the wall.

[0022] The specific method is as follows: Using a thermosetting resin as the matrix and low thermal conductivity reinforcing fibers as the reinforcing phase, an FRP rebar anchor bolt is manufactured. As the method for the anchor bolt body that penetrates the thermal insulation functional layer and penetrates deep into the base wall, the volume ratio of its internal reinforcing fibers is not less than 25%, and at least 30% of the reinforcing fibers are oriented at an angle less than 5° to the length direction of the rebar anchor bolt. The thermal conductivity k of the FRP rebar anchor bolt is ≤2 W / (m·K), the tensile strength is ≥300 MPa, the shear strength is ≥60 MPa, the bonding force F1 between the rebar anchor bolt and the wall under the action of tension is ≥0.6 KN, the bonding force F2 between the rebar anchor bolt and the tray body is ≥0.6 KN, and under normal use conditions, after 70 years, the attenuation rate of the above indicators is not greater than 30%.

[0023] Optimally, the cross-section of the FRP rebar anchor bolt is non-circular, and the area of its cross-section is smaller than the cross-sectional area of the wall bottom hole, so that the FRP rebar anchor bolt can enter the wall bottom hole; the maximum outer contour diameter of the cross-section is larger than the diameter of the wall bottom hole, so that after the FRP rebar anchor bolt enters the wall bottom hole, a mutual extrusion force between the FRP rebar anchor bolt and the wall bottom hole can be obtained. This extrusion force brings the frictional force between the FRP rebar anchor bolt and the wall bottom hole, and this frictional force ensures that the force required to pull out the FRP rebar anchor bolt from the wall bottom hole is greater than 0.6 KN.

[0024] Optimally, the outer surface of the FRP rebar anchor bolt has threads, and the major diameter of its threads is larger than the diameter of the wall bottom hole, so that after the FRP rebar anchor bolt enters the wall bottom hole, a mutual extrusion force between the FRP rebar anchor bolt and the wall bottom hole can be obtained. This extrusion force brings the frictional force between the FRP rebar anchor bolt and the wall bottom hole, and this frictional force ensures that the force required to pull out the FRP rebar anchor bolt from the wall bottom hole is greater than 0.6 KN.

[0025] Optimally, the binder is tightly wrapped by a capsule, avoiding loss and curing, and maintaining good fluidity within the specified period.

[0026] Optimally, the reinforcing fibers of the fiber-reinforced resin composite material FRP rebar anchor bolt are made of inorganic non-metallic fiber materials or organic polymer materials without electronic heat conduction.

[0027] Optimally, the reinforcing fibers of the fiber-reinforced resin composite material FRP rebar anchor bolt are made of glass fiber materials, that is: glass fiber reinforced resin composite material GFRP.

[0028] Optimally, the reinforcing fibers of the fiber-reinforced resin composite material FRP rebar anchor bolt are made of basalt fiber materials, that is: basalt fiber reinforced resin composite material BFRP.

[0029] Optimally, the reinforcing fibers of the fiber-reinforced resin composite material FRP tendon bolts are made of organic fiber materials without electronic heat conduction, including aramid fibers, that is: aramid fiber-reinforced resin composite material AFRP.

[0030] Optimally, the matrix resin of the fiber-reinforced resin composite material FRP tendon bolts is made of thermosetting organic resin, which is in a cured state after manufacturing. The microscopic change is that the thermosetting organic resin polymer crosslinks from a linear molecular form into a spatial three-dimensional molecular form, and the curing process is irreversible, with a slow aging rate in the natural environment.

[0031] Optimally, the fiber-reinforced resin composite material FRP tendon bolts can be combined with the tray body to form an anchor bolt assembly with a tray.

[0032] Optimally, the outer cylindrical surface of the fiber-reinforced resin composite material FRP tendon bolts has external threads, and its external threads can cooperate with the internal threads of the tray body to form an anchor bolt assembly with the tray body.

[0033] Optimally, the tray body is an integral part composed of a tray and a pipe. The tray body is made of stainless steel material and has excellent durability.

[0034] Optimally, the tray body is made of thermosetting resin material and has excellent durability.

[0035] Optimally, the tray body is made of FRP material and has excellent durability. Description of the Drawings

[0036] Figure 1 It is a cross-sectional view of the anchoring method of the thermal insulation layer composite material. Among them, 1 is the wall, 2 is the thermal insulation layer, 3 is the anchor bolt assembly formed by connecting the FRP tendon bolt with the tray body 5. The tray body 5 is composed of a tray 4 and a pipe 6 as a whole. The anchor bolt assembly 3 with a total length of L penetrates through the thermal insulation layer 2 with a thickness of C. T is the length of the tray body 5, 9 is the binder flowing out of the capsule, and J is the distance between the bottom end of the bottom hole and the tip of the FRP tendon bolt body after installation.

[0037] Figure 2 It is an anchor bolt assembly with a capsule. In the figure, 4 is the tray, 5 is the tray body, 6 is the pipe. The tray 4 and the pipe 6 are combined into the tray body 5. 7 is the binder, 8 is the capsule, and K is the effective length of the capsule.

[0038] Figure 3 is Figure 1 in A-AThe sectional view is a cross-sectional view showing the combination of the FRP tendon bolt and the inner hole of the wall. The bottom hole 10 is drilled in the wall, the cross-section 11 of the FRP tendon bolt, the circle 12 where the high point of the FRP tendon bolt is located. The area enclosed by the bottom hole 10 drilled in the wall is larger than the area of the cross-section 11 of the FRP tendon bolt, and the diameter of the circle 12 where the high point of the FRP tendon bolt is located is larger than the diameter of the bottom hole 10 drilled in the wall. This ensures that when the adhesive 9 has not yet cured, the extrusion force between the FRP tendon bolt and the bottom hole of the wall brings frictional force, and this frictional force ensures that the tendon bolt will not come out.

[0039] Figure 4 It is an anchor bolt assembly with a capsule. In the figure, 4 is the tray, 13 is the tray body, 14 is the threaded pipe. The tray 4 and the threaded pipe 14 are combined into the tray body 13. 7 is the adhesive, 8 is the capsule, K is the effective length of the capsule. The outer surface of the FRP tendon bolt has threads, and it is a spiral FRP tendon bolt. The spiral FRP tendon bolt forms a threaded fit with the internal threads of the threaded pipe 14.

[0040] Figure 5 It is a cross-sectional view showing the combination of the spiral FRP tendon bolt and the inner hole of the wall. The cross-section 16 of the spiral FRP tendon bolt, the minor diameter 15 of the spiral FRP tendon bolt, the bottom hole 10 drilled in the wall, the major diameter 17 of the spiral FRP tendon bolt. The area enclosed by the bottom hole 10 drilled in the wall is larger than the area of the cross-section 16 of the spiral FRP tendon bolt, and the major diameter 17 of the spiral FRP tendon bolt is larger than the diameter of the bottom hole 10 drilled in the wall. This ensures that when the adhesive 9 has not yet cured, the extrusion force between the FRP tendon bolt and the bottom hole of the wall brings frictional force, and this frictional force ensures that the spiral tendon bolt will not come out. Embodiment

[0041] The first step is to make the bottom hole 10 in the wall 1 and the thermal insulation layer 2.

[0042] The second step is to insert the anchor bolt assembly into the bottom hole 10 with the capsule 8 in the front direction.

[0043] The third step is to apply force to the tray 4. The anchor bolt assembly 3 enters the bottom hole 10 until the tray 4 holds up the thermal insulation layer 2. At this time, the distance J between the top end of the FRP tendon bolt and the bottom of the bottom hole 10 is less than the length K of the capsule 8. The capsule 8 breaks, and part of the adhesive 9 flows into the gap between the FRP tendon bolt body and the bottom hole 10. Subsequently, the adhesive cures, making the FRP tendon bolt firmly bonded to the bottom hole 10.

Claims

1. A method for anchoring a building insulation layer combined with a composite material and a capsule, which relates to the technology of anchoring the insulation layer on a wall, and is characterized in that: The FRP tendon bolt, as the main bolt structure that penetrates the thermal insulation functional layer and extends into the base wall, has the volume ratio of its internal reinforcing fibers not less than 25%, and at least 30% of the reinforcing fibers are oriented at an angle less than 5° with the length direction of the tendon bolt. The thermal conductivity coefficient k of the tendon bolt is ≤ 2 W / (m·K), the breaking strength is ≥ 300 MPa, the shear strength is ≥ 60 MPa, the bonding force F1 between the tendon bolt and the wall under the pulling action is ≥ 0.6 KN, and the bonding force F2 between the tendon bolt and the tray body is ≥ 0.6 KN. A capsule is provided at the tip of the FRP tendon bolt, and an adhesive is wrapped inside the capsule. During the process of the FRP tendon bolt entering the wall, the capsule is punctured by the top end of the FRP tendon bolt, and the adhesive enters the space between the FRP tendon bolt and the bottom hole of the wall. Subsequently, the adhesive solidifies, firmly bonding the FRP tendon bolt to the bottom hole of the wall. Make a bottom hole (10) on the wall (1) and the thermal insulation layer (2), insert the bolt assembly into the bottom hole (10) with the capsule (8) facing forward, apply force to the tray (4), and the bolt assembly (3) enters the bottom hole (10) until the tray (4) supports the thermal insulation layer (2). At this time, the distance (J) between the top end of the FRP tendon bolt and the bottom of the bottom hole (10) is less than the length (K) of the capsule (8), the capsule (8) ruptures, and part of the adhesive (9) flows into the gap between the FRP tendon bolt body and the bottom hole (10). Subsequently, the adhesive cures, firmly bonding the FRP tendon bolt to the bottom hole (10).

2. The method for anchoring a building thermal insulation layer combined with a composite material and a capsule according to claim 1 is characterized in that: The cross-section of the FRP tendon bolt is non-circular, and its cross-sectional area is smaller than the cross-sectional area of the bottom hole of the wall, enabling the FRP tendon bolt to enter the bottom hole of the wall; the maximum outer contour diameter of the cross-section is larger than the diameter of the bottom hole of the wall, so that after the FRP tendon bolt enters the bottom hole of the wall, a mutual extrusion force between the FRP tendon bolt and the bottom hole of the wall can be obtained. This extrusion force brings about the frictional force between the FRP tendon bolt and the bottom hole of the wall, and this frictional force ensures that the force required to pull out the FRP tendon bolt from the bottom hole of the wall is greater than 0.6 KN.

3. The method for anchoring a building thermal insulation layer combined with a composite material and a capsule as described in claim 1 is characterized in that: The outer surface of the FRP tendon bolt has threads, and the major diameter of its threads is larger than the diameter of the bottom hole of the wall, so that after the FRP tendon bolt enters the bottom hole of the wall, a mutual extrusion force between the FRP tendon bolt and the bottom hole of the wall can be obtained. This extrusion force brings about the frictional force between the FRP tendon bolt and the bottom hole of the wall, and this frictional force ensures that the force required to pull out the FRP tendon bolt from the bottom hole of the wall is greater than 0.6 KN.

4. The anchoring method of a building thermal insulation layer combined with a composite material and a capsule according to claim 1 is characterized in that: The adhesive is tightly wrapped by the capsule, preventing loss and curing, and maintaining good fluidity within the specified period.

5. The method for anchoring a building insulation layer formed by combining a composite material and a capsule as claimed in claim 1 is characterized in that: The reinforcing fibers of the fiber-reinforced resin composite material FRP tendon bolt adopt inorganic non-metallic fiber materials or organic polymer materials without electronic heat conduction.

6. The anchoring method of a building insulation layer combining a composite material and a capsule according to claim 1 is characterized in that: The reinforcing fibers of the fiber-reinforced resin composite material FRP tendon bolt adopt glass fiber materials, that is: glass fiber-reinforced resin composite material GFRP.

7. The anchoring method of a building thermal insulation layer combined with a composite material and a capsule as described in claim 1 is characterized in that: The reinforcing fibers of the fiber-reinforced resin composite material FRP tendon bolt adopt basalt fiber materials, that is: basalt fiber-reinforced resin composite material BFRP.

8. The anchoring method of a building thermal insulation layer combining a composite material and a capsule as claimed in claim 1, characterized in that: The reinforcing fibers of the fiber-reinforced resin composite material FRP rebar anchor bolt adopt organic fiber materials without electronic heat conduction, including aramid fibers, that is: aramid fiber-reinforced resin composite material AFRP.

9. The method for anchoring a building insulation layer formed by combining a composite material and a capsule as claimed in claim 1 is characterized in that: The matrix resin of the fiber-reinforced resin composite material FRP rebar anchor bolt adopts thermosetting organic resin and is in a cured state after manufacturing. The microscopic change is that the thermosetting organic resin polymer crosslinks from a linear molecular structure into a spatial three-dimensional molecular structure, and the curing process is irreversible, with a slow aging rate in the natural environment.

10. The anchoring method of a building thermal insulation layer combined with a composite material and a capsule according to claim 1 is characterized in that: The tray body is an integral part composed of a tray and a pipe. The tray body is made of stainless steel material and has excellent durability.

11. The method for anchoring a building thermal insulation layer combined with a composite material and a capsule as described in claim 1 is characterized in that: The outer cylindrical surface of the fiber-reinforced resin composite material FRP rebar anchor bolt has external threads, and its external threads can cooperate with the internal threads of the tray body to form an anchor bolt assembly with a tray body.

12. The method for anchoring a building thermal insulation layer combined with a composite material and a capsule as claimed in claim 1, characterized in that: The tray body is made of thermosetting resin material and has excellent durability.

13. The method for anchoring a building thermal insulation layer formed by combining a composite material and a capsule as described in claim 1 is characterized in that: The tray body is made of FRP material and has excellent durability.

14. The method for anchoring a building insulation layer combined with a composite material and a capsule as described in claim 1 is characterized in that: The fiber-reinforced resin composite material FRP rebar anchor bolt can be combined with the tray body to form an anchor bolt assembly with a tray.

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