Construction method of lattice column support system used in plank bridge construction

Abstract

The present invention relates to the technical field of support systems and discloses a construction method of a lattice column support system used in the construction of a plank bridge. The method comprises the following steps: locating the arrangement positions of a plurality of vertical poles at a construction site, embedding and fixing the lower parts of the plurality of vertical poles in a rock layer, arranging a plurality of cross bars in a transverse direction, connecting the cross bars with the vertical poles to form connection positions, arranging a plurality of longitudinal poles through the plurality of connection positions, and connecting the vertical poles and the cross bars respectively. The plurality of vertical poles, longitudinal poles and cross bars constitute a lattice column support system; by utilizing a pile foundation, positioning and setting up a plurality of vertical poles, longitudinal poles and cross bars, the lattice column support system formed embraces the outer periphery of the pile foundation pier, and the inclined bars provided at the same time can enhance the strength, stiffness and stability of the lattice column support system. In this way, the lattice column support system can overcome the problems of a weak foundation due to difficulty in treating the foundation and the instability of supports on steep slopes, thereby greatly reducing the construction difficulty, improving the safety performance and enhancing the stability.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of support systems, specifically, to a construction method of a lattice column support system used in the construction of plank bridges. Background Art

[0002] At present, full-height scaffolding is generally used as the support system. In the actual construction process of full-height scaffolding, the foundation is first treated and leveled, and then the cushion layer is poured on the foundation and pre-loaded. After the pre-load is qualified, the full-height scaffolding is erected according to the support system plan to form the scaffolding into a whole. After the pre-load is qualified, the construction of the beams and slabs can be carried out.

[0003] At present, the construction area of ​​the plank bridge is close to the mountain and the sea, with the characteristics of rocky beaches, steep stone walls, partial crossing of the sea surface and high scaffolding. If a full-bridge scaffolding is used as the support system, the foundation treatment will be difficult to meet the requirements, the stability will be poor, the safety will be difficult to ensure, and the construction will be troublesome. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction method for a lattice column support system used in plank bridge construction, aiming to solve the problem in the prior art that a full-height scaffolding is used as a support system during plank bridge construction, which causes construction troubles.

[0005] The present invention is achieved by a construction method of a lattice column support system used in plank bridge construction, comprising the following construction steps:

[0006] 1) Locate the layout of multiple vertical poles at the construction site according to the center line of the cast-in-place slab;

[0007] 2) The bottom of the construction site is a rock layer, and the lower parts of multiple vertical poles are embedded and fixed in the rock layer, and the upper parts of the vertical poles extend vertically upward;

[0008] 3) Arrange a plurality of horizontal bars along the transverse direction, wherein the horizontal bars are connected to a plurality of vertical bars, and the connection positions between the horizontal bars and the vertical bars form connection positions; arrange a plurality of longitudinal bars along the longitudinal direction, wherein the longitudinal bars pass through a plurality of connection positions and are respectively connected to the vertical bars and the horizontal bars;

[0009] 4) A plurality of the vertical uprights, longitudinal uprights and transverse bars constitute a lattice column support system, and the lattice column support system surrounds the outer periphery of the pier column; the lattice column support system has an outer side, and a plurality of diagonal bars are arranged on the outer side, and the diagonal bars are connected to the plurality of vertical uprights.

[0010] Optionally, in the construction step 4), a plurality of the diagonal rods are arranged crosswise to form a scissors strut.

[0011] Optionally, the inclination angle of the oblique rod ranges from 45° to 60°.

[0012] Optionally, the outer side of the lattice column support system is covered with a dense mesh, and the dense mesh covers the scissors brace.

[0013] Optionally, in the construction step 4), the plurality of longitudinal uprights and transverse bars form a horizontally arranged support frame.

[0014] Optionally, in the construction step 4), a plurality of square timbers are arranged vertically and horizontally on the support frame.

[0015] Optionally, in the construction step 4), a bottom formwork is arranged on the square timbers of the support frame.

[0016] Optionally, in the construction step 2), a borehole is drilled in the rock layer, and a steel bar is embedded in the borehole; the steel bar has an anchoring section at its lower portion and a connecting section at its upper portion; the anchoring section is embedded in the borehole, and slurry is injected into the borehole, whereby the slurry integrates the anchoring section with the rock layer;

[0017] The vertical pole is a steel pipe with a through hole provided therein. In the construction step 2), the lower part of the vertical pole is put on the connecting section, and the connecting section is inserted into the through hole of the vertical pole from bottom to top and fixedly connected to the vertical connecting rod.

[0018] Optionally, in the construction step 2), reaming drilling is performed at the bottom of the borehole to form an reaming section, wherein the diameter of the reaming section is larger than the diameter of the pile hole;

[0019] The bottom of the anchoring section is connected to a deformed steel cage that is spherical and deformed by transverse expansion under pressure, and the diameter of the deformed steel cage is smaller than the diameter of the drilled hole; the bottom of the deformed steel cage has a bottom curved plate, and the top of the deformed steel cage has a top curved plate, and the bottom of the anchoring section is connected to the top curved plate;

[0020] In the construction step 2), the anchoring section is inserted into the drilled hole until the bottom curved plate of the deformed steel bar cage abuts against the bottom of the hole-expanding section, and then pressure is applied to drive the anchoring section to continue to be inserted downward. The downward pressure of the anchoring section drives the top curved plate to be concave downward, and the two sides of the deformed steel bar cage expand and deform outward to form an expansion portion, until the top curved plate abuts against the bottom curved plate, and the expansion portion of the deformed steel bar cage abuts against the inner side wall of the hole-expanding section, and then grouting is injected into the pile hole.

[0021] Optionally, the deformable steel cage has two shaping balls. In the construction step 2), when pressure is applied to drive the anchoring section to continue to be inserted downward, the two shaping balls are respectively squeezed into the two expansion parts, shaping the shapes of the two expansion parts, and during the grouting process, limiting the expansion parts from being squeezed, collapsed and deformed.

[0022] Compared with the prior art, the construction method of the lattice column support system for plank bridge construction provided by the present invention utilizes pile foundations to position and build a lattice column support system composed of multiple vertical poles, longitudinal poles and transverse poles, and the lattice column support system embraces the outer periphery of the pier of the pile foundation, so that it can effectively support the construction of beams and slabs in subsequent processes, and at the same time, the inclined rods can effectively enhance the strength, rigidity and stability of the lattice column support system. In this way, the lattice column support system formed can effectively overcome the problems of poor geographical and geological conditions in areas with complex terrain, mountains and the sea, rocky beaches, steep stone walls, and partial crossing of the sea surface. At the same time, it can overcome the problems of difficult foundation treatment resulting in unstable foundation and easy instability of supports on steep slopes, greatly reducing the difficulty of construction, improving safety performance, and enhancing stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view schematic diagram of a lattice column support system structure used in plank bridge construction provided by the present invention;

[0024] Figure 2 is a front view schematic diagram of the steel bar provided by the present invention in a drilled hole;

[0025] Figure 3 It is a front view schematic diagram showing that the anchoring section provided by the present invention is completely embedded in the drill hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0028] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] Reference Figure 1-3 The figure shows a preferred embodiment of the present invention.

[0030] The construction method of the lattice column support system used in the construction of a plank bridge provided by the present invention comprises the following construction steps:

[0031] 1) According to the center line of the cast-in-place slab, the layout positions of multiple vertical poles 100 are located at the construction site.

[0032] 2) The bottom of the construction site is a rock layer. The lower parts of the plurality of vertical poles 100 are embedded and fixed in the rock layer, and the upper parts of the vertical poles 100 extend vertically upward.

[0033] 3) Arrange multiple horizontal bars 102 along the horizontal direction, and the horizontal bars 102 are connected to multiple vertical bars 100. The connecting positions 103 between the horizontal bars 102 and the vertical bars 100 form connecting positions 103; arrange multiple longitudinal bars 104 along the longitudinal direction, and the longitudinal bars 104 pass through the multiple connecting positions 103 and are respectively connected to the vertical bars 100 and the horizontal bars 102.

[0034] 4) A plurality of vertical uprights 100 , longitudinal uprights 104 and transverse bars 102 constitute a lattice column support system, which surrounds the outer periphery of the pier 105 ; the lattice column support system has an outer side, on which a plurality of diagonal bars 106 are arranged, which are connected to the plurality of vertical uprights 100 .

[0035] The construction method of the lattice column support system used in the construction of the plank bridge provided by the present invention utilizes the pile foundation to position and build a lattice column support system composed of multiple vertical poles 100, longitudinal poles 104 and transverse poles 102, and the lattice column support system embraces the outer periphery of the pier 105 of the pile foundation, so that it can effectively support the construction of the beam and slab in the subsequent process. At the same time, the inclined rods 106 can effectively enhance the strength, rigidity and stability of the lattice column support system. In this way, the lattice column support system formed can effectively overcome the problems of poor geographical and geological conditions in areas with complex terrain, mountains and the sea, rocky beaches, steep stone walls, and partial crossing of the sea surface. At the same time, it can overcome the problems of unstable foundation caused by difficult foundation treatment and easy instability of supports on steep slopes, greatly reducing the difficulty of construction, improving safety performance, and enhancing stability.

[0036] Specifically, in construction step 4), multiple diagonal rods 106 are arranged crosswise to form scissor braces 107. In this way, the scissor braces 107 can play a longitudinal stabilizing effect on the lattice column support system and enhance the longitudinal rigidity.

[0037] The tilt angle range of the diagonal rod 106 is between 45° and 60°. In this way, in order to ensure the longitudinal stability effect of the scissors brace 107 on the structural column support system, arranging the diagonal rod 106 to have a tilt angle range of 45° to 60° can best ensure its effect.

[0038] The outer side of the lattice column support system is covered with a dense mesh 108, and the dense mesh 108 covers the scissors brace 107. In this way, the dense mesh 108 is covered on the outer side of the structural column support system. The covered dense mesh 108 is a safety net that can prevent people from falling and prevent injuries caused by falling.

[0039] In this embodiment, in construction step 4), a plurality of longitudinal uprights 104 and transverse bars 102 form a horizontally arranged support frame. The longitudinal uprights 104 are arranged horizontally, perpendicular to the transverse bars 102, and the transverse bars are also arranged horizontally, forming a horizontally arranged rectangular support frame.

[0040] In construction step 4), multiple square timbers are arranged vertically and horizontally on the support frame. In this way, the arranged square timbers can fix the support frame, fix the formwork, support the building formwork, and make the lattice column support system more solid.

[0041] In construction step 4), the bottom formwork is placed on the square timbers of the support frame. Placing the bottom formwork on the square timbers can increase the stability of the lattice column support system and evenly transfer the vertical column load.

[0042] In construction step 2), a borehole 109 is drilled into the rock layer, and a steel bar 110 is embedded in the borehole 109; the lower part of the steel bar 110 has an anchoring section 111, and the upper part of the steel bar 110 has a connecting section 112; the anchoring section 111 is embedded in the borehole 109, and slurry is injected into the borehole 109, and the slurry combines the anchoring section 111 with the rock layer into one.

[0043] The vertical pole 100 is a steel pipe with a through hole. In construction step 2), the lower part of the vertical pole 100 is put on the connecting section 112. The connecting section 112 is inserted into the through hole of the vertical pole 100 from bottom to top and is fixedly connected to the vertical connecting rod.

[0044] A borehole 109 is formed by drilling, and the borehole 109 can be used for embedding the steel bar 110. After the anchoring section 111 of the steel bar 110 is anchored in the borehole 109, slurry is injected so that the steel bar 110 can be fixedly connected to the borehole 109. At the same time, a through hole is provided in the vertical pole 100, and the connecting section 112 of the steel bar 110 can be inserted into the through hole, thereby fixing the steel bar 110 and the vertical pole 100.

[0045] In construction step 2), reaming is performed at the bottom of the borehole 109 to form an reaming section 113 , the diameter of which is larger than the diameter of the pile hole.

[0046] The bottom of the anchoring section 111 is connected to a spherical deformed steel cage 114 that expands and deforms laterally under pressure. The diameter of the deformed steel cage 114 is smaller than the diameter of the borehole 109. The bottom of the deformed steel cage 114 has a bottom curved plate 115, and the top of the deformed steel cage 114 has a top curved plate 116. The bottom of the anchoring section 111 is connected to the top curved plate 116.

[0047] In construction step 2), the anchoring section 111 is inserted into the borehole 109 until the bottom curved plate 115 of the deformed steel cage 114 abuts against the bottom of the reaming section 113, and then pressure is applied to drive the anchoring section 111 to continue to be inserted downward. The downward pressure of the anchoring section 111 drives the top curved plate 116 to be concave downward, and the two sides of the deformed steel cage 114 expand and deform outward to form an expansion portion 118 until the top curved plate 116 abuts against the bottom curved plate 115, and the expansion portion 118 of the deformed steel cage 114 abuts against the inner wall of the reaming section 113, and then grouting is injected into the pile hole.

[0048] The bottom of the borehole 109 is expanded, and the expanded hole can be used to deform and fill the deformed steel cage 114 provided at the bottom of the anchoring section 111, thereby fixing the anchoring section 111 in the rock layer. The deformed steel cage 114 has a bottom arc plate 115, which drives the pressure. The bottom arc plate 115 is concave downward and abuts against the bottom of the borehole 109. The driving pressure causes the top arc plate 116 to continue to press downward until the top arc plate 116 abuts against the bottom arc plate 115. In this process, the top arc plate 116 and the two ends of the bottom arc plate can be deformed. The deformed deformed section is affected by the downward pressure of the top arc plate 116 and expands outward to the expansion part 118 abutting against the expanded hole section 113, thereby increasing the contact area between the bottom of the anchoring section 111 and the rock layer. Grouting is then injected into the borehole 109 to stably connect the anchoring section 111 to the rock layer.

[0049] Specifically, there are two shaping balls 117 in the deformable steel cage 114. In construction step 2), when pressure is applied to drive the anchoring section 111 to continue to be inserted downward, the two shaping balls 117 are respectively squeezed into the two expansion parts 118, shaping the shapes of the two expansion parts 118, and during the grouting process, the expansion parts 118 are restricted from being squeezed, collapsed and deformed.

[0050] By providing shaping balls 117, the shaping balls 117 are arranged on both sides of the expansion section and in the deformed steel cage 114. When the top curved plate 116 is pressed down to the bottom to abut against the bottom curved plate 115, the shaping balls 117 set on both sides of the deformed steel cage 114 expand toward the periphery along with the expansion portion 118. At the same time, the thickness of the expansion portion 118 gradually narrows and the width gradually increases. Since the shaping balls 117 are spherical, the thickness of the expansion portion 118 narrows to the diameter of the shaping balls 117, that is, it cannot expand. The shaping balls 117 are pre-set according to the established widening section thickness. In this way, the expansion portion 118 can be completely abutted against the expansion section 113 on all sides. At the same time, during the grouting process, the shaping balls 117 can shape the expansion portion 118 and protect the expansion portion 118 from being squeezed, collapsed and deformed.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a lattice column support system used in plank bridge construction, characterized in that: The construction steps include: 1) Locate the layout of multiple vertical poles at the construction site according to the center line of the cast-in-place slab; 2) The bottom of the construction site is a rock layer, and the lower parts of multiple vertical poles are embedded and fixed in the rock layer, and the upper parts of the vertical poles extend vertically upward; 3) Arrange a plurality of horizontal bars along the transverse direction, wherein the horizontal bars are connected to a plurality of vertical bars, and the connection positions between the horizontal bars and the vertical bars form connection positions; arrange a plurality of longitudinal bars along the longitudinal direction, wherein the longitudinal bars pass through a plurality of connection positions and are respectively connected to the vertical bars and the horizontal bars; 4) The plurality of vertical poles, longitudinal poles and transverse poles constitute a lattice column support system, wherein the lattice column support system surrounds the outer periphery of the pier column; the lattice column support system has an outer side, wherein the outer side is provided with a plurality of diagonal poles, wherein the diagonal poles are connected to the plurality of vertical poles; In the construction step 2), a borehole is drilled in the rock layer, and a steel bar is embedded in the borehole; the lower portion of the steel bar has an anchoring section, and the upper portion of the steel bar has a connecting section; the anchoring section is embedded in the borehole, and slurry is injected into the borehole, and the slurry integrates the anchoring section and the rock layer; The vertical pole is a steel pipe with a through hole provided therein. In the construction step 2), the lower portion of the vertical pole is sleeved on the connecting section. The connecting section is inserted from bottom to top into the through hole of the vertical pole and fixedly connected to the vertical connecting rod. In the construction step 2), reaming is performed at the bottom of the borehole to form an reaming section, wherein the diameter of the reaming section is larger than the diameter of the pile hole; The bottom of the anchoring section is connected to a deformed steel cage that is spherical and deformed by transverse expansion under pressure, and the diameter of the deformed steel cage is smaller than the diameter of the drilled hole; the bottom of the deformed steel cage has a bottom curved plate, and the top of the deformed steel cage has a top curved plate, and the bottom of the anchoring section is connected to the top curved plate; In the construction step 2), the anchoring section is inserted into the drilled hole until the bottom curved plate of the deformed steel cage abuts the bottom of the hole-expanding section, and then pressure is applied to drive the anchoring section to continue to be inserted downward. The downward pressure of the anchoring section drives the top curved plate to be concave downward, and the two sides of the deformed steel cage expand and deform outward to form an expanded portion, until the top curved plate abuts the bottom curved plate, and the expanded portion of the deformed steel cage abuts the inner side wall of the hole-expanding section, and then grouting is injected into the pile hole; The deformable steel cage has two shaping balls. In the construction step 2), when pressure is applied to drive the anchoring section to continue to be inserted downward, the two shaping balls are respectively squeezed into the two expansion parts, shaping the shapes of the two expansion parts, and during the grouting process, the expansion parts are restricted from being squeezed, collapsed and deformed.

2. The construction method of the lattice column support system used in plank bridge construction according to claim 1, characterized in that: In the construction step 4), the plurality of diagonal rods are arranged crosswise to form scissor braces.

3. The construction method of the lattice column support system used in plank bridge construction according to claim 1, characterized in that: The inclination angle of the oblique rod ranges from 45° to 60°.

4. The construction method of the lattice column support system used in plank bridge construction according to claim 2, characterized in that: The outer side of the lattice column support system is covered with a dense mesh, and the dense mesh covers the scissors braces.

5. The construction method of the lattice column support system used in plank bridge construction according to claim 1, characterized in that: In the construction step 4), the plurality of longitudinal uprights and transverse bars form a horizontally arranged support frame.

6. The construction method of the lattice column support system used in plank bridge construction according to claim 5, characterized in that: In the construction step 4), a plurality of square timbers are arranged vertically and horizontally on the support frame.

7. The construction method of the lattice column support system used in plank bridge construction according to claim 6, characterized in that: In the construction step 4), a bottom formwork is arranged on the square timbers of the support frame.

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