CN113502978B - Embedded lower chord herringbone frame web member assembly truss - Google Patents

Abstract

The invention relates to an assembled truss with built-in lower chord herringbone web members. The assembled truss includes an upper chord member, a herringbone web member and an embedded lower chord member. The herringbone web member is arranged in the embedded lower chord member. Above the lower chord of the herringbone, the end of the herringbone is covered with an embedded lower chord and connected to the lower chord. The upper chord is laid flat above the web of the herringbone and connected to the web of the herringbone. The belly of the herringbone is The pole contains at least two prefabricated gables, which are assembled with a single gable as a basic unit. The embedded lower chord herringbone web-rod assembled truss of the present invention adopts the method of prefabrication in pieces and on-site assembly, which facilitates transportation and yard storage, saves costs, improves convenience, thereby greatly reducing the construction period and bringing It has economic benefits and broad application prospects, and will greatly promote the development of prefabricated structures.

Description

Embedded lower chord herringbone frame web member assembled truss

Technical field

The invention relates to the technical field of concrete structures in civil engineering, and in particular to an assembled truss, specifically an assembled lower chord herringbone web-bar assembled truss.

Background technique

Prefabricated concrete structures have become an irreplaceable technology and structural form in the construction industry. The production and production of precast concrete components occupy an important position. Trusses are a commonly used structural form. Precast concrete trusses serve as building, roof structures and bridges. Structures, etc. have been widely used in engineering. However, the integral prefabricated concrete trusses not only occupy a large space due to their huge outer dimensions and are mostly made on site due to transportation restrictions, but also require storage space for integral prefabrication of the trusses as well as complex reinforcement and complex mold systems for the trusses. and high cost, all make this process flawed. Even compared to solid beams, the savings in truss material are offset by the cumbersomeness of mold costs and complex reinforcement, which causes the advantages to be offset. In addition, when the truss span is large, on-site open-air cast-in-place production is also affected by factors such as typhoons, heavy rain, and low temperature weather, which also affects the progress. Practice has proved that: trusses, as a traditional construction method of integral prefabrication, affect the construction period and cost, leading to an increase in construction period and cost, and it is difficult to reflect the advantages of prefabricated structures.

Therefore, further innovative thinking is needed to solve this problem.

Contents of the invention

The object of the present invention is to overcome the above-mentioned shortcomings in the prior art and provide an embedded bottom chord herringbone web-bar assembled truss that can be quickly and conveniently produced and transported, and improves the applicability and versatility of its engineering applications.

In order to achieve the above objectives, the embedded lower chord herringbone web-rod assembled truss of the present invention adopts the following technical solutions:

The built-in lower chord herringbone web rod assembled truss includes an upper chord, a herringbone web rod and an embedded lower chord. The herringbone web rod is arranged above the built-in lower chord and connected with the built-in lower chord. The lower chord is connected with the lower chord, and the upper chord is arranged above the web of the herringbone and connected to the web of the herringbone. The web of the herringbone contains at least two prefabricated herringbones, with a single herringbone as the The basic unit is assembled, and the end of the herringbone frame body covers the embedded lower chord.

The "human" frame has the same meaning as the "eight" frame and the inverted "V" frame. When inverted, it becomes a "Y" frame, an inverted "eight" frame, a "V" frame, etc., in In the present invention, they are collectively referred to as herringbone frames, and the herringbone frame materials are concrete, steel or steel-concrete composite materials.

The herringbone frame is an integral component, is provided with a first end and a second end, and includes a first limb and a second limb. The axes of the first limb and the second limb are set to angle, the upper ends of the first limb and the second limb are connected into a whole.

The herringbone frames are arranged along the axis direction of the upper chord and the embedded lower chord, and the ends of adjacent herringbones are pressed against each other.

The herringbone frame, together with the upper chord and the embedded lower chord, forms a vertical truss. The herringbone frame serves as the web of the truss and is subject to shear as a whole (the first and second limbs are only subject to axial force). The upper chord is horizontally compressed, and the lower chord serves as the lower (horizontal) tension chord. Compared with the integrally prefabricated trusses, although the truss form saves materials and reduces its own weight than solid beams, the molds required for prefabrication are complex and expensive, and the complexity of the integral truss reinforcement partially offsets the aforementioned advantages of the trusses. The use of herringbone web members decomposes the web members of the above-mentioned trusses into simple basic units. The repetition rate is highly improved, mold costs are saved, and the reinforcement is also standardized and simplified. The combination of solid beams and integral trusses is Integrating the advantages and discarding their respective shortcomings is the optimal idea. Moreover, compared with disassembling the truss web members into single tension or compression members, which are unstable, complicated and difficult to control during installation, the herringbone form has both overall advantages and convenience during installation. sexual advantage and therefore the optimal concept.

Further, the first end of the lower part of the herringbone frame is provided with an embedded space (opening) for inserting the embedded lower chord, and the inner side of the embedded space (near the lower chord) is provided with an anti-slip protrusion. Used to prevent the embedded bottom chord from being separated from the herringbone frame, the anti-slip protrusions are in the shape of ribs, blocks, points or bolts.

Furthermore, the plug-shaped anti-slip protrusions are configured in an assembled type, with one end inserted into the herringbone frame body and the other end exposed, which is called the exposed end. The exposed end is arranged in the built-in space of the herringbone frame. , a rear slurry is arranged in the gap between the embedded lower chord and the herringbone frame, and the embedded lower chord and the herringbone frame are connected together. The rear slurry is realized by grouting.

Optionally, an anti-slip groove is provided inside the built-in space (near the lower chord) of the first end of the lower part of the herringbone frame to prevent the embedded lower chord from being separated from the herringbone frame. The shape of the anti-slip groove is rib-like, block-like, point-like or plug-like.

The lower chord is configured as an embedded type, and the first end of the lower part of the herringbone frame covers the embedded lower chord.

Further, the lower chord is configured as a hollow tube body. The pipe body material is concrete, steel or steel-concrete composite material.

Further, a rib body is added to the pipe body. The rib body can apply prestress to the lower chord. The rib body is made of steel, carbon fiber or high-strength engineering materials. The steel rib body is steel bar, prestressed tendon (steel strand). , steel wire or prestressed threaded steel bars, etc.).

A hole is provided inside the upper chord rod, and the second end of the upper part of the herringbone frame is arranged in the hole of the upper chord rod. The upper chord material is concrete, steel or steel-concrete composite material.

Further, the upper chord and the lower chord are arranged in segments, and the chords of each section are arranged as chord segments. The chord segments of the upper chord are provided with transverse holes inside, and the upper part of the herringbone frame is The two ends are arranged in the transverse holes of the upper chord section. The chord section is a part of the chord.

Furthermore, the embedded lower chord is provided with an anti-slip key at the location where it meets the herringbone frame to prevent the lower end of the herringbone frame from sliding with the embedded lower chord. The shape of the anti-slip key is strip or block. , point-shaped or plug-shaped, and the material is concrete, steel, steel-concrete composite materials, chemical materials or wood. The anti-slip key and the embedded lower chord are set as a whole, or they are set as a separate assembly or directly connected.

Furthermore, an anti-slip bolt is provided at the intersection between the built-in lower chord and the herringbone frame. The anti-slip bolt is installed in an assembly type and directly penetrates the end of the herringbone frame body and the built-in lower chord.

Optionally, the embedded lower chord is provided with an anti-slip groove at the point where it meets the herringbone frame, and a rear slurry is provided in the anti-slip groove to prevent the lower end of the herringbone frame from sliding with the embedded lower chord. , the shape of the anti-slip groove is prism, block, point or plug.

Further, a wedge body is provided between the second end of the upper part of the herringbone frame and the upper chord hole, and the wedge body is a rear slurry body, a wedge body, etc.

An end rod is provided at the end of the embedded lower chord herringbone web rod assembled truss to connect the upper chord and the embedded lower chord to withstand the pressure of the support. The end rod is arranged vertically, and the The frame, built-in bottom chord and end rods are arranged in the vertical plane.

The beneficial effect of the present invention is that compared with the existing concrete truss, the embedded lower chord herringbone web rod assembled truss has the following advantages:

1. The gable web uses a single girder as the basic unit. The prefabrication repetition rate is greatly improved, giving full play to the advantages and strengths of prefabricated assembly. The steel mold used in the prefabrication of the integral concrete truss is more complex and more complex than the solid beam. The cost has increased sharply. With the use of herringbone webs, the steel molds used in prefabrication have become extremely simple and the cost has been significantly reduced. Compared with the overall prefabricated concrete truss, the cost of steel molds has been reduced from one million yuan to one thousand yuan. and 100-yuan level, which completely improves the disadvantage of prefabricated steel molds having a large cost proportion, and is conducive to the application and promotion of prefabricated assemblies;

2. The segmented prefabricated upper chord and the cost of steel molds for the chord sections are as significant as the construction convenience and speed of the herringbone;

3. The storage and transportation costs of the built-in lower chord herringbone truss and web-rod assembled truss are greatly reduced, and the convenience is significantly improved;

4. Assemble the truss on site. Since each segment has reached strength in advance, it only requires local rainproof measures (such as workers holding umbrellas or wearing ponchos). The truss can still be assembled in harsh environments such as rainy days and low temperatures. The assembly work is accelerated, and the construction speed is accelerated.

In short, the use of the embedded lower chord herringbone web-bar assembled truss of the present invention can save costs, shorten the construction period (and in many cases the construction period is the cost), improve efficiency, improve construction convenience, and make the application of prefabricated assembled trusses It has a broader prospect and is more suitable to become the optimal choice for prefabricated buildings.

Description of the drawings

Figure 1 is a side elevation view of the herringbone frame of the present invention.

Figure 2 is a side elevation view of the assembled position of the herringbone frame of the present invention.

Figure 3 is a longitudinal sectional view of the herringbone frame of the present invention after being assembled with the upper chord and the built-in lower chord.

Figure 4 is a cross-sectional view of the herringbone frame of the present invention assembled with the upper chord and the built-in lower chord.

Figure 5 is a cross-sectional view of the positional relationship between the embedded lower chord and the herringbone frame of the present invention.

Figure 6 is a longitudinal sectional view of the positional relationship between the embedded lower chord and the herringbone frame of the present invention.

Figure 7 is a horizontal cross-sectional view of the positional relationship between the embedded lower chord and the herringbone frame of the present invention.

Reference signs:

1 herringbone frame

11 first limb

12 Second limb

13 anti-slip bumps

14 embedded space

141 anti-slip grooves

2 winding rod

3 Inline lower chord

31 muscles

32 anti-slip keys

4 end rods

5 post slurry

Detailed ways

In order to understand the technical content of the present invention more clearly, the following examples are given for detailed description.

Please refer to Figures 1 to 7, wherein the built-in lower chord herringbone web-bar assembled truss includes a herringbone 1, an upper chord 2, an embedded lower chord 3 and an end rod 4. The web bar of the herringbone frame 1 is disposed above the embedded lower chord bar 3 and connected to the built-in lower chord bar 3. The upper chord bar 2 is disposed above the web bar of the herringbone frame 1 and connected to the web bar of the herringbone frame 1. The end The rod 4 connects the upper chord 2 and the embedded lower chord 3. The herringbone frame 1, the embedded lower chord 3 and the end rod 4 are arranged in a vertical plane. The web bars of the herringbone frame 1 include multiple prefabricated herringbone frames 1, which are assembled with a single herringbone frame 1 as a basic unit. The herringbone frame 1 is a whole and includes a first branch 11 and a second branch 12. The axes of the first branch 11 and the second branch 12 are set at a set angle. The upper ends of the limb 11 and the second branch 12 are connected as a whole. The lower end of the herringbone frame 1 is provided with an anti-slip protrusion 13, the hollow tube body of the embedded lower chord 3 is provided with a rib 31, and the embedded lower chord 3 is provided with an anti-slip key 32. An embedded space 14 is provided in the frame at the second end of the herringbone frame 1. An anti-slip groove 141 is provided inside the embedded space 14. The space between the embedded lower chord 3 and the herringbone frame 1 is The rear slurry 5 is provided in the embedded space 14 .

Example 1

Step one: In the prefabrication factory, prefabricate the herringbone, upper chord, built-in lower chord and end rod in parallel at the same time;

Step 2: Transport the above-mentioned prefabricated components to the assembly site. First, assemble the herringbone frame with the embedded lower chord. Place the embedded lower chord into the embedded space of the first end frame of the lower part of the herringbone frame. The post-positioned slurry is injected into the gap between the herringbone frame and the lower chord to fix the herringbone frame and the lower chord, forming a fabricated herringbone frame web rod;

Step 3: Lay the upper chord rod flatly on the herringbone frame, place the second end of the upper part of the herringbone frame into the hole of the upper chord rod, and use a wedge body to wedge the end of the herringbone frame;

Step 4: Insert ribs into the embedded lower chord rod body, and tension the ribs to tighten the lower chord rod;

Step 5: Hoist the assembled built-in lower chord herringbone web-bar assembled truss to the required position.

The embedded lower chord herringbone web-rod assembled truss proposed by the present invention adopts the method of prefabrication in pieces and on-site assembly, which facilitates transportation and yard storage, saves costs, improves convenience, thereby greatly reducing the construction period and bringing It has economic benefits and broad application prospects, and will greatly promote the development of prefabricated structures.

In this specification, the invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and changes can be made without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims (4)

1. An embedded lower chord herringbone web rod assembled truss, characterized in that the embedded lower chord herringbone web rod assembled truss includes an upper chord and a herringbone web rod and an embedded type lower chord, the herringbone frame web bar is arranged above the embedded lower chord bar and connected to the embedded lower chord bar, the upper chord bar is arranged on the herringbone frame web bar Above and connected to the herringbone web bar, the herringbone web bar includes at least two prefabricated herringbones, and is assembled with a single herringbone as a basic unit. The end of the herringbone Covering the inline lower chord; The herringbone frame is made of concrete and is prefabricated as a whole. Together with the upper chord and the embedded lower chord, it forms a vertical truss. The whole herringbone frame is provided with a first end and a second end, and the The herringbone frame includes a first limb and a second limb. The axes of the first limb and the second limb are set at a preset angle. The upper ends of the first limb and the second limb are connected. As a whole, the herringbone frame is arranged along the axis direction of the upper chord and the embedded lower chord, and the ends of adjacent herringbones are pressed against each other; the herringbone frame serves as the web of the truss and is sheared as a whole , the first and second limbs are only subject to axial force, the upper chord is horizontally compressed, and the lower chord serves as the lower horizontal tensioning chord; compared to the overall prefabricated truss, although the truss form saves material than solid beams, Reduce dead weight, but the molds required for prefabrication are complex and expensive, and the complexity of the overall truss reinforcement partially offsets the aforementioned advantages of the truss. The use of herringbone web members decomposes the web members of the truss into simple basic components. Unit, the repetition rate is increased, mold costs are saved, and the reinforcement is also standardized and simplified, integrating the advantages of solid beams and integral trusses, and discarding their respective shortcomings; compared with disassembling the truss web members into single beams, Tension or compression rods are unstable, complex and difficult to control during installation. The form of the herringbone has both overall advantages and convenience during installation; The inner side of the built-in space of the frame body at the first end of the lower part of the herringbone frame is provided with anti-slip protrusions, or the inner side of the embedded space of the frame body at the first end of the lower part of the herringbone frame is provided with an anti-slip protrusion. Anti-slip groove; the gap between the embedded space at the first end of the lower part of the herringbone frame and the embedded lower chord is provided with a rear slurry for connecting the herringbone frame with The embedded lower chords are connected together; the embedded lower chords are provided with anti-slip keys or anti-slip grooves at the location where they meet the herringbone frame; The embedded lower chord is set as a hollow pipe body; ribs are added to the pipe body, and the ribs are used to apply prestress to tighten the embedded lower chord; the upper chord A hole is provided inside the rod, and the second end of the upper part of the herringbone frame is arranged in the hole of the upper chord rod; The embedded lower chord herringbone web-rod assembled truss is implemented using the following method: Step one: In the prefabrication factory, prefabricate the herringbone, upper chord, built-in lower chord and end rod in parallel at the same time; Step 2: Transport the above-mentioned prefabricated components to the assembly site. First, assemble the herringbone frame with the embedded lower chord. Place the embedded lower chord into the embedded space of the first end frame of the lower part of the herringbone frame. The post-positioned slurry is injected into the gap between the herringbone frame and the lower chord to fix the herringbone frame and the lower chord, forming a fabricated herringbone frame web rod; Step 3: Lay the upper chord rod flatly on the herringbone frame, place the second end of the upper part of the herringbone frame into the hole of the upper chord rod, and use a wedge body to wedge the end of the herringbone frame; Step 4: Insert ribs into the embedded lower chord rod body, and tension the ribs to tighten the lower chord rod; Step 5: Hoist the assembled built-in lower chord herringbone web-bar assembled truss to the required position. 2. The built-in lower chord herringbone web-rod assembled truss according to claim 1, characterized in that the upper chord and the lower chord are arranged in segments, and the chords of each section are arranged as chords. section, the chord section of the upper chord rod is provided with a hole inside, and the second end of the upper part of the herringbone frame is arranged in the hole of the chord section of the upper chord rod. 3. The embedded lower chord herringbone web rod assembled truss according to claim 1, characterized in that the end of the embedded lower chord herringbone web rod assembled truss is provided with a connection point. The end rods of the upper chord and the lower chord bear the pressure of the support. The end rods are arranged vertically. The herringbone frame, the embedded lower chord and the end rod are arranged in a vertical plane. 4. The built-in lower chord herringbone frame web-bar assembled truss according to any one of claims 1 to 3, characterized in that the built-in bottom chord is connected with the herringbone frame. The anti-skid bolt is provided at the position of the anti-skid bolt, and the anti-skid bolt is arranged in an assembled type and directly penetrates the end of the frame of the herringbone frame and the embedded lower chord.