CN110984175A - Bolt anchor connecting node for open cut foundation pit purlin enclosing structure - Google Patents

Abstract

The invention provides a bolt anchor connecting node for an open cut foundation pit purlin enclosing structure, which belongs to the technical field of underground building engineering and comprises a base and a bolt seat, wherein the base is connected with the bolt seat through a bolt head; the bolt head is connected with the bolt seat through a centering fixing rod; one side of the latch seat is connected with the enclosing purlin component, and the other side of the latch seat is connected with the enclosing purlin component through the enclosing purlin conversion piece. The base forms the stiff end through the slip casting anchor in enclosing purlin component side soil body recess, guarantees to enclose the loading effect such as pulling force, moment of flexure, moment of torsion under the purlin structure bears different operating modes, encloses the difficult drop of purlin structure, and the security is higher, encloses the purlin component and fixes in breech seat both sides. When the enclosing purlin structure is detached, only the enclosing purlin member and the enclosing purlin conversion piece near the node are detached, and the method is convenient and easy to operate. The novel purlin structure changes the stress characteristic of the traditional purlin structure, is convenient and quick to mount and dismount, is firmer in structure, and can bear various loads.

Description

Bolt anchor connecting node for open cut foundation pit purlin enclosing structure

Technical Field

The invention belongs to the technical field of underground construction engineering, and particularly relates to a bolt anchor connecting node for an open cut foundation pit purlin enclosing structure.

Background

At present, more and more underground projects of modern large and medium-sized cities are provided, including projects such as foundation pits of buildings, underground subway stations, underground garages and the like. A plurality of foundation pits are often constructed by an open cut method in construction, and the arrangement of the support system in the steel pipes improves the horizontal rigidity of the support system and reduces the movement of soil bodies into the pits. In order to ensure that the supporting structure forms a structure system, a surrounding purlin structure is arranged, namely the inner steel pipe support and the surrounding purlin structure form the supporting structure system. The purlin structure node is only placed in the soil body recess to tradition, and tensile, torsional resistance are poor, enclose the risk that the purlin structure easily exists and drop.

Disclosure of Invention

The invention aims to provide a bolt anchor connecting node for an open cut foundation pit purlin enclosing structure, and the bolt anchor connecting node is used for solving the technical problem that the purlin enclosing structure is easy to fall off in the using process in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: providing a bolt anchor connecting node for an open cut foundation pit purlin surrounding structure, wherein the bolt anchor connecting node comprises a base anchored in a soil body groove on the side surface of a purlin surrounding component and a bolt seat fixedly connected with the purlin surrounding component, the base is connected with the bolt seat through a bolt head, and a limiting and reinforcing structure matched with the bolt head is arranged inside the base; the bolt head is connected with the bolt seat through a centering fixing rod; one side of the latch seat is connected with the enclosing purlin member, and the other side of the latch seat is connected with the enclosing purlin member through the enclosing purlin converting piece; the base is anchored in a soil body groove on the side face of the enclosing purlin component through grouting.

Furthermore, the bolt head comprises a bolt core, a fixed fan top plate, a fixed fan bottom plate and an intermediate support plate, wherein the bolt core is in a long rod shape, the fixed fan top plate, the fixed fan bottom plate and the intermediate support plate are arranged in parallel and are all perpendicular to the central axis of the bolt core, the fixed fan bottom plate is arranged at one end of the bolt core, the fixed fan top plate is arranged at the other end of the bolt core, one or more support plates are arranged, and the support plates are arranged between the fixed fan bottom plate and the fixed fan top plate; the fixed fan top plate is connected with the latch base through the centering fixing rod, and the fixed fan bottom plate and the supporting plate are matched with the limiting reinforcing structure in the base.

Furthermore, the fixed fan bottom plate and the fixed fan top plate both comprise two sector plates, straight edge junctions of the two sector plates are in an arc shape matched with an excircle of the bolt core, the two sector plates are symmetrically arranged on two sides of the bolt core, and the fixed fan bottom plate and the sector plates of the fixed fan top plate are arranged in parallel; the supporting plate is in a circular plate shape sleeved on the excircle of the latch core, and the radius of the supporting plate is smaller than that of the sector plate; and locking structures matched with the latch heads are arranged in front of and behind the latch seat.

Furthermore, the latch base comprises four latch base side plates which are sequentially connected end to form a hollow cylinder body, two middle partition plates parallel to the left latch base side plate and the right latch base side plate are arranged between the left latch base side plate and the right latch base side plate, and the tops and the bottoms of the two middle partition plates are connected through cover plates; the left latch seat side plate, the right latch seat side plate and the front latch seat side plate are respectively provided with a connecting hole matched with a bolt, and the latch seats are fixedly connected with the enclosing purlin member and the enclosing purlin converting piece through the bolts; the periphery of the side plate of the rear latch seat is connected with the base; the middle parts of the front and the rear latch seat side plates are provided with locking structures matched with the latch heads.

Furthermore, the locking structure comprises a via hole matched with the fixed fan top plate, the fixed fan bottom plate and the middle support plate and a limiting ring matched with the centering fixing rod, wherein the via hole is formed in the middle of the front latch base side plate and the rear latch base side plate, the via hole is a round hole, two arc limiting plates are arranged inside the via hole of the front latch base side plate, the inner arc surfaces of the two arc limiting plates are arranged in a vertically opposite mode, and the two arc limiting plates are connected with the inner wall of the via hole through first connecting pieces respectively; the limiting ring is arranged in the middle of the outer arc surface of the arc limiting plate; a centering ring matched with the limiting ring is arranged in the middle of the arc-shaped edge of the fan-shaped plate of the fixed fan top plate, and an inner hole of the centering ring is matched with the centering fixing rod;

during the use, pass the via hole of the fixed fan bottom plate of bolt head and backup pad in proper order in the past back bolt socket curb plate and get into inside and rotatory 90 of base and bolt socket, fixed fan roof pushes away to hug closely the back with anterior bolt socket curb plate, inserts the centering ring of fixed fan roof and the spacing intra-annular of anterior via hole with the centering dead lever for the rotation of restriction bolt head.

Further, the base includes four end to end's base curb plate, the base curb plate links to each other with the four sides one-to-one of rear portion latch seat curb plate, spacing reinforced structure sets up inside the base curb plate.

Further, spacing reinforced structure includes the fixed arc board of two relative settings, and the arc wall of two fixed arc boards sets up relatively, the arc wall of fixed arc board and the fan-shaped plate edge phase-match of fixed fan bottom plate, the back of fixed arc board passes through the second connecting piece and links to each other with upper and lower base curb plate.

Furthermore, the number of the first connecting pieces and the number of the second connecting pieces are four, the first connecting pieces and the second connecting pieces are arranged pairwise, the upper pair of the first connecting pieces and the lower pair of the first connecting pieces are fixed on the inner walls of the upper cover plate and the lower cover plate at intervals in parallel, and the upper pair of the second connecting pieces and the lower pair of the second connecting pieces are fixed on the inner walls of the top base side plate and the.

Furthermore, the bolt core is in a long rod shape, and rib plates are arranged between the side surfaces of the fixed sash top plate, the fixed sash bottom plate and the middle support plate and the bolt core.

Further, the right bolt seat side plate is connected with the enclosing purlin component through a first connecting steel plate and a second connecting steel plate, connecting holes matched with bolts are formed in the first connecting steel plate and the second connecting steel plate, the first connecting steel plate is arranged between the right bolt seat side plate and the enclosing purlin component, the first connecting steel plate and the end portion of the enclosing purlin component are welded and fixed, the second connecting steel plate is arranged on the front portion of the front bolt seat side plate and the front portion of the enclosing purlin component, and the first connecting steel plate and the second connecting steel plate are connected with the front bolt seat side plate and the enclosing purlin component respectively through bolts.

The purlin surrounding conversion piece is a hollow cylinder body, the middle part of the purlin surrounding conversion piece is vertically provided with a conversion piece partition plate, the purlin surrounding conversion piece is formed by connecting four conversion piece side plates at the front, the back, the left and the right, and the left and the right conversion piece side plates are respectively connected with a left latch base side plate and a purlin surrounding component through bolts; similarly, a first connecting steel plate is arranged between the left enclosing purlin component and the enclosing purlin conversion piece, the first connecting steel plate and the end part of the enclosing purlin component are welded and fixed in advance, and a second connecting steel plate is arranged at the front part of the front latch seat side plate, the enclosing purlin component and the front part of the enclosing purlin component; the first connecting steel plate and the enclosing purlin conversion piece are fixedly connected through the bolt, and the front conversion piece side plate and the front latch seat side plate as well as the front conversion piece side plate and the enclosing purlin component are fixedly connected through the bolt and the two second connecting steel plates respectively.

The bolt anchor connecting node of the open cut foundation pit surrounding purlin structure has the beneficial effects that: compared with the prior art, the base is anchored in soil at the rear part of the purlin enclosing structure through grouting to form a fixed end, so that the purlin enclosing structure can bear loads such as tensile force, bending moment and torque under different working conditions, is not easy to fall off, and is higher in safety; bolt seat both sides with enclose the purlin component and be connected or through enclosing the purlin converting part with enclose the purlin component connection, connected mode convenient and fast when demolising and enclose the purlin structure, only need with this node both sides enclose the purlin component and enclose the purlin conversion demolish can, convenient easy going. The novel enclosing purlin structure changes the stress characteristic of the traditional enclosing purlin structure, is convenient and quick to install and disassemble, is firm in structure, is not easy to fall off, is convenient and quick to install and disassemble, is good in safety performance, reasonable in technology, strong in operability and convenient to popularize and apply.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described 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.

Fig. 1 is a schematic plan view of a bolt anchor connecting node for an open cut foundation pit purlin enclosing structure according to an embodiment of the present invention;

fig. 2 is a front view of the bolt anchor connecting node for the open cut foundation pit purlin enclosing structure in fig. 1;

FIG. 3 is a top view of the base of FIG. 1;

FIG. 4 is a front view of the base of FIG. 1;

FIG. 5 is a top view of the latch base of FIG. 1;

FIG. 6 is a front view of the latch base of FIG. 1;

FIG. 7 is a cross-sectional view of the latch base A-A;

FIG. 8 is a cross-sectional view of the latch base B-B;

FIG. 9 is a top view of the latch head of FIG. 1;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 9;

FIG. 11 is a cross-sectional view taken along line D-D of FIG. 9;

FIG. 12 is a cross-sectional view E-E of FIG. 9;

FIG. 13 is a top view of a purlin transition;

FIG. 14 is a front view of a purlin transition;

FIG. 15 is a front view of a first connecting steel plate;

FIG. 16 is a front view of a second connecting steel plate;

wherein, in the figures, the respective reference numerals:

00. soil body recess, 1, enclose purlin, 2, enclose purlin flange, 3, first connecting steel plate, 4, second connecting steel plate, 5, enclose purlin crossover sub, 6, bolt seat, 7, bolt head, 8, base, 9, bolt, 10, enclose purlin web, 11, crossover sub curb plate, 12, crossover sub median septum, 13, bolt seat curb plate, 14, median septum, 15, fixed fan roof, 16, centering ring, 17, bolt core, 18, second connecting piece, 19, floor, 20, connecting hole, 21, apron, 22, fixed arc board, 23, fixed fan bottom plate, 24, backup pad, 25, centering dead lever, 26, base curb plate, 27, via hole, 28, spacing ring, 29, arc limiting plate, 30, first connecting piece.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Referring to fig. 1 and fig. 2 together, the bolt-anchor connecting node for the open cut foundation pit purlin enclosing structure provided by the invention will be described. The bolt anchor connecting node for the open cut foundation pit purlin surrounding structure comprises a base 8 anchored in a soil body groove 00 on the side surface of a purlin surrounding component 1 and a bolt seat 6 fixedly connected with the purlin surrounding component 1, wherein the base 8 is connected with the bolt seat 6 through a bolt head 7, and a limiting and reinforcing structure matched with the bolt head 7 is arranged inside the base 8; the latch head 7 is connected with the latch seat 6 through a centering fixing rod 25; one side of the latch seat 6 is connected with the enclosing purlin member 1, and the other side of the latch seat is connected with the enclosing purlin member 1 through the enclosing purlin conversion piece 5, and the latch seat is connected by bolts so as to be convenient and fast to assemble and disassemble; the base 8 is anchored in the soil body groove 00 on the side surface of the enclosing purlin component 1 through grouting, so that the enclosing purlin structure is not easy to fall off.

Compared with the prior art, the bolt anchor connecting node for the open cut foundation pit purlin enclosing structure has the advantages of reasonable structure, convenience in operation and high safety performance, the base and a soil body form a whole body through grouting the periphery of the base, and the base and the soil body are anchored to form a fixed end, so that the purlin enclosing structure can bear the effects of tension, bending moment and torque load, the structure changes the traditional unfavorable installation mode that the purlin enclosing node is only placed in a groove of the soil body, and the safety is higher; fix the bolt seat on the base through the bolt head, enclose the purlin component directly or through enclosing the purlin converting part and be connected with the bolt seat, the structure atress is clear and definite, only need when demolising with near node enclose the purlin converting part and enclose the purlin component demolish can, the installation with dismantle convenient and fast, the technique is reasonable, maneuverability is strong, has important engineering using value and development prospect.

Further, referring to fig. 1 and 9, as an embodiment of the present invention, the latch head 7 includes a latch core 17, a fixed leaf top plate 15, a fixed leaf bottom plate 23 and an intermediate support plate 24, the latch core 17 is a long rod, the fixed leaf top plate 15, the fixed leaf bottom plate 23 and the intermediate support plate 24 are arranged in parallel and perpendicular to a central axis of the latch core 17, the fixed leaf bottom plate 23 is arranged at one end of the latch core 17, the fixed leaf top plate 15 is arranged at the other end of the latch core 17, the support plates 24 are one or more, and the support plates 24 are arranged between the fixed leaf bottom plate 23 and the fixed leaf top plate 15; the fixed fan top plate 15 is connected with the latch base 6 through a centering fixing rod 25, and the fixed fan bottom plate 23 and the supporting plate 24 are matched with a limiting reinforcing structure in the base 8.

Further, referring to fig. 1, 9, and 10-12, as a specific embodiment of the present invention, the fixed fan bottom plate 23 and the fixed fan top plate 15 both include two sector plates, a straight edge junction of the two sector plates is an arc shape matching with an outer circle of the latch core 17, the two sector plates are symmetrically disposed on two sides of the latch core 17, and the fixed fan bottom plate 23 and the sector plates of the fixed fan top plate 15 are disposed in parallel; the support plate 24 is in a circular ring plate shape sleeved on the excircle of the latch core 17, and the radius of the support plate 24 is smaller than that of the sector plate; and locking structures matched with the latch heads 7 are arranged at the front and the rear of the latch seat 6.

Further, referring to fig. 1, 2, 5-8, as a specific embodiment provided by the present invention, the latch base 6 includes four latch base side plates 13, the four latch base side plates 13 are sequentially connected end to end front and back and left and right to form a hollow cylinder, two middle partition plates 14 parallel to the left and right latch base side plates 13 are disposed between the left and right latch base side plates 13, and the top and bottom of the two middle partition plates 14 are connected through a cover plate 21; the left, right and front latch base side plates 13 are respectively provided with a connecting hole 20 matched with the bolt 9, and the latch base 6 is fixedly connected with the surrounding purlin component 1 and the surrounding purlin converting piece 5 through the bolt 9; the periphery of the rear latch seat side plate 13 is connected with the base 8; the middle parts of the front and rear latch seat side plates 13 are provided with locking structures matched with the latch heads 7.

Further optimizing the above technical solution, as shown in fig. 5-8, the locking structure includes a via hole 27 for cooperating with the fixed sash top plate 15, the fixed sash bottom plate 23 and the middle support plate 24, and a limit ring 28 for cooperating with the centering fixing rod 25, the via hole 27 is disposed in the middle of the front and rear latch base side plates 13, the via holes of the front and rear latch base side plates are disposed between the middle partition plates on the left and right sides, a middle partition plate for reinforcement is disposed in the middle between the middle partition plates on the left and right sides, the middle partition plate is perpendicular to the middle partition plates on the two sides, and the center of the middle partition plate 14 is also provided; the through hole 27 is a circular hole, two arc limiting plates 29 are arranged inside the through hole 27 of the front latch seat side plate 13, the inner arc surfaces of the two arc limiting plates 29 are arranged oppositely up and down, and the two arc limiting plates 29 are respectively connected with the inner wall of the through hole 27 through first connecting pieces 30; the limiting ring 28 is arranged in the middle of the outer arc surface of the arc limiting plate 29; the middle part of the arc-shaped edge of the sector plate of the fixed sector top plate 15 is provided with a centering ring 16 matched with the limiting ring 28, and the inner hole of the centering ring 16 is matched with the centering fixing rod 25.

When the bolt head 7 is used, the fixing fan bottom plate 23 and the supporting plate 24 of the bolt head 7 sequentially penetrate through the through holes 27 of the front and rear bolt seat side plates 13 to enter the base 8 and the bolt seat 6 and rotate 90 degrees, the fixing fan top plate 15 is pushed to be tightly attached to the front bolt seat side plate 13, and the centering fixing rod 25 is inserted into the centering ring 16 of the fixing fan top plate 15 and the limiting ring 28 of the front through hole 27 and used for limiting the rotation of the bolt head 7.

Further, referring to fig. 1-4, as an embodiment of the present invention, the base 8 includes four base side plates 26 connected end to end, the base side plates 26 are correspondingly connected to four sides of the rear latch base side plate 13, and the limiting reinforcement structure is disposed inside the base side plates 26. The limiting and reinforcing structure comprises two fixed arc plates 22 which are oppositely arranged, arc grooves of the two fixed arc plates 22 are oppositely arranged, the arc grooves of the fixed arc plates 22 are matched with the edges of fan-shaped plates of a fixed fan bottom plate 23, and the back surfaces of the fixed arc plates 22 are connected with upper and lower base side plates 26 through second connecting pieces 18.

Further, referring to fig. 4 and 6, as an embodiment of the present invention, four first connecting members 30 and four second connecting members 18 are provided, and two of the first connecting members 30 and two of the second connecting members 18 are provided in pairs, the upper and lower pairs of first connecting members 30 are fixed on the inner walls of the upper and lower cover plates 21 at intervals, and the upper and lower pairs of second connecting members 18 are fixed on the inner walls of the top base side plate 26 and the bottom base side plate 26 at intervals.

Further, referring to fig. 2 and 9, as an embodiment of the present invention, the latch core 17 is a long rod, and ribs 19 are disposed between the latch core 10 and the side surfaces of the fixed leaf top plate 15, the fixed leaf bottom plate 23 and the middle support plate 24, so as to enhance the strength of the latch head.

Further, referring to fig. 1, 2, and 13-16, as an embodiment of the present invention, the right latch base side plate 13 is connected to the purlin surrounding member 1 through a first connecting steel plate 3 and a second connecting steel plate 4, the first connecting steel plate 3 and the second connecting steel plate 4 are both provided with a connecting hole 20 matched with the bolt 9, the first connecting steel plate 3 is disposed between the right latch base side plate 13 and the purlin surrounding member 1, the first connecting steel plate 3 is welded and fixed to the end of the purlin surrounding member 1, the second connecting steel plate 4 is disposed in front of the front latch base side plate 13 and the purlin surrounding member 1, and the first connecting steel plate 3 and the second connecting steel plate 4 are respectively connected to the front latch base side plate 13 and the purlin surrounding member 1 through the bolt 9.

The enclosing purlin converting piece 5 is a hollow cylinder body, the middle part of the hollow cylinder body is vertically provided with a converting piece partition plate 12, the enclosing purlin converting piece 5 is formed by connecting front, rear, left and right converting piece side plates 11 end to end, and the left and right converting piece side plates 11 are respectively connected with a left latch base side plate 13 and an enclosing purlin component 1 through bolts 9; similarly, a first connecting steel plate 3 is arranged between the left enclosing purlin member 1 and the enclosing purlin converting piece 5, the first connecting steel plate 3 and the end part of the enclosing purlin member 1 are welded and fixed in advance, and a second connecting steel plate 4 is arranged at the front part of the front latch base side plate 13, the enclosing purlin member 5 and the front part of the enclosing purlin member 1; the first connecting steel plate 3 and the enclosing purlin conversion piece 5 are fixedly connected through a bolt 9, and the front conversion piece side plate 11 and the front latch seat side plate 13 and the front conversion piece side plate 11 and the enclosing purlin component 1 are fixedly connected through the bolt 9 and two second connecting steel plates 4 respectively.

The specific processing, manufacturing, mounting and dismounting processes of the invention are as follows:

the method comprises the following steps: manufacturing a base 8: the fixed arc plate 22 is 10mm thick, 100mm in outer diameter, 90mm in inner diameter, 80 degrees in radian, and the fixed arc plate 22 is welded with the two second connecting pieces 18. The thickness of the second connecting piece 18 is 10mm, the width is 10mm, the length is 100mm, the horizontal distance between the outer side and the circle center of the fixed arc plate 22 is 50mm, and the fixed arc plate 22 is welded with the base side plate 26. The base side plate 26 has a thickness of 10mm, and is welded into an open rectangular hexahedron having a length of 500mm, a width of 400mm, and a height of 400 mm.

Step two: manufacturing a bolt head 7: the latch core 17 is a cylindrical rod body having a diameter of 50mm and a length of 750 mm. Two fixed roof 15 of fanning of bolt core 17 top welding, fixed roof 15 of fanning and bolt core 17 welding department welding two floor 19, floor 19 is right angle isosceles triangle, and the right angle limit is 50mm, and thickness is 10 mm. The inner radius of the fixed fan top plate 15 is 25mm, the outer radius is 100mm, the thickness is 20mm, and the radian is 90 degrees. A centering ring 16 is welded in the center of each fixed fan top plate 15, and the diameter of the centering ring 16 is 10 mm. Two fixed fan bottom plates 23 are welded at the bottom of the bolt core 17, the inner radius of the fixed fan bottom plate 27 is 25mm, the outer radius is 100mm, the thickness is 20mm, the radian is 90 degrees, and two rib plates 19 are welded at the welding position of the fixed fan bottom plate 23 and the bolt core 17. The supporting plates 24 are respectively welded at positions 150mm and 300mm away from the bottom of the bolt core 17, the outer radius of each supporting plate 24 is 85mm, the inner radius of each supporting plate is 25mm, the thickness of each supporting plate is 10mm, and welding rib plates 19 are arranged between the bolt core 17 and the supporting plates 24.

Step three: manufacturing a bolt seat 6: the latch base side plate 13 having a thickness of 20mm is welded into a hexahedron having an upper and lower opening, a length of 800mm, a width of 300mm, and a height of 400mm, and has a circular hole having a radius of 140mm opened on both front and rear surfaces as a through hole 27. The distance between the two latch seat middle partition plates 14 and the latch seat side plate 13 is 200mm, and the thickness is 20 mm. The thickness of the arc limiting plate 29 is 10mm, the outer diameter is 100mm, the inner diameter is 90mm, the radian is 80 degrees, and the arc limiting plate 29 is welded with the two first connecting pieces 30. First connecting piece 30 thickness is 10mm, and the width is 10mm, and length is 100mm, and the outside is apart from arc limiting plate 29 centre of a circle horizontal distance 50mm, and first connecting piece 30 and latch seat apron 21 welding fix arc limiting plate 29 in the via hole 27 of anterior latch seat curb plate, and latch seat apron 21 thickness is 10 mm. A limiting ring 28 with the diameter of 10mm is welded at the top end of the arc limiting plate 29. The cover plate 21 is welded between the two latch base middle partition plates 14 and at the upper and lower ends of the latch base side plate 13.

Step four: manufacturing a surrounding purlin conversion piece 5: the side plate 11 of the conversion member has a thickness of 20mm, and is welded into a hexahedron having an upper and lower opening, a length of 400mm, a width of 300mm, and a height of 400 mm. The middle of the long side is welded with a baffle plate 12 in the conversion piece with the thickness of 20 mm. Two rows are arranged in the long side direction, 4 bolt holes with the diameter of 20mm are arranged in each row, and 4 bolt connecting holes 20 with the diameter of 20mm are arranged in the middle of the short side direction.

Step five: and manufacturing a second connecting steel plate 4, wherein the width of the second connecting steel plate 4 is 300mm, the height of the second connecting steel plate 4 is 400mm, and the thickness of the second connecting steel plate 4 is 20 mm. Two rows are manufactured, each row is provided with 4 bolt connecting holes 20 with the diameter of 20mm, and the distance between each bolt connecting hole 20 and the side is 50 mm.

Step six: a first connection steel plate 3 was produced, the first connection steel plate 3 having a width of 300mm, a height of 400mm and a thickness of 20 mm. A row of 4 bolt holes 20 with a diameter of 20mm is made.

Step seven: manufacturing a bolt 9: the bolt is directly 16mm, selects 8.8-grade common bolt, and the length of bolt is 100 mm.

Step eight: and conveying the manufactured test piece to a foundation pit construction site. And welding the first connecting steel plate 3 to the end part of the purlin surrounding member 1 on the ground. The first connecting steel plate 3 is connected with the latch seat 6 through bolts 9, and the latch seat 6 and the purlin enclosing member 1 are respectively connected with the connecting steel plate 4 through bolts 9. The first connecting steel plate 3 is welded to the end portion of the enclosing purlin component 1, the first connecting steel plate 3 is connected with the enclosing purlin conversion piece 5 through bolts 9, and the enclosing purlin conversion piece 5 and the enclosing purlin component 1 are connected with the connecting steel plate 4 through bolts 9 respectively.

Step nine: the foundation pit is provided with a soil groove with the excavation depth of 60cm, the width of 50cm and the height of 50cm at the node position of the enclosing purlin, the base 8 is placed into the soil groove, grouting is carried out on the outer side of the base 8, after slurry is solidified, the base 8 is anchored with a soil body, and a fixed end is formed.

Step ten: the bolt seat 6 is aligned with the base 8, the bolt head 7 is inserted from the bolt seat 6, the bottom of the bolt head 7 passes through the fixed arc plate 22 in the base 8 and then rotates by 90 degrees, so that the centering ring 16 on the bolt head 7 is aligned with the limiting ring 28 on the bolt seat 6, and the centering fixing rod 25 is inserted into the limiting ring 28 and the centering ring 16, so that the bolt seat 6 and the base 8 are installed.

Step eleven: enclosing purlin converting piece 5 is connected with bolt seat 6 through bolt 9, and enclosing purlin converting piece 5 is connected with bolt seat 6 and second connecting steel plate 4 through bolt 9, accomplishes the installation of enclosing purlin node.

Step twelve: and (3) dismantling the nodes: removing the bolts 9 of the purlin conversion piece 5 and the latch seat 6, and removing the bolts 9 of the purlin conversion piece 5 connected with the latch seat 6 through the connecting steel plate 4; removing the centering fixing rod 25, rotating the latch head 15 by 90 degrees, and drawing out the latch head 15; the latch base 6 can be removed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A bolt anchor connected node for open cut foundation ditch encloses purlin structure, its characterized in that: the base is connected with the latch seat through a latch head, and a limiting and reinforcing structure matched with the latch head is arranged inside the base; the bolt head is connected with the bolt seat through a centering fixing rod; one side of the latch seat is connected with the enclosing purlin member, and the other side of the latch seat is connected with the enclosing purlin member through the enclosing purlin converting piece; the base is anchored in a soil body groove on the side face of the enclosing purlin component through grouting.

2. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 1, wherein: the bolt head comprises a bolt core, a fixed fan top plate, a fixed fan bottom plate and an intermediate support plate, wherein the bolt core is in a long rod shape, the fixed fan top plate, the fixed fan bottom plate and the intermediate support plate are arranged in parallel and are all perpendicular to the central axis of the bolt core, the fixed fan bottom plate is arranged at one end of the bolt core, the fixed fan top plate is arranged at the other end of the bolt core, one or more support plates are arranged, and the support plates are arranged between the fixed fan bottom plate and the fixed fan top plate; the fixed fan top plate is connected with the latch base through the centering fixing rod, and the fixed fan bottom plate and the supporting plate are matched with the limiting reinforcing structure in the base.

3. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 2, wherein: the fixed fan bottom plate and the fixed fan top plate both comprise two sector plates, the straight edge junctions of the two sector plates are in an arc shape matched with the excircle of the bolt core, the two sector plates are symmetrically arranged on two sides of the bolt core, and the fixed fan bottom plate and the sector plates of the fixed fan top plate are arranged in parallel; the supporting plate is in a circular plate shape sleeved on the excircle of the latch core, and the radius of the supporting plate is smaller than that of the sector plate; and locking structures matched with the latch heads are arranged in front of and behind the latch seat.

4. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 3, wherein: the latch base comprises four latch base side plates which are sequentially connected end to end from front to back and from left to right to form a hollow cylinder, two middle partition plates parallel to the left and right latch base side plates are arranged between the left and right latch base side plates, and the tops and the bottoms of the two middle partition plates are connected through cover plates; the left latch seat side plate, the right latch seat side plate and the front latch seat side plate are respectively provided with a connecting hole matched with a bolt, and the latch seats are fixedly connected with the enclosing purlin member and the enclosing purlin converting piece through the bolts; the periphery of the side plate of the rear latch seat is connected with the base; the middle parts of the front and the rear latch seat side plates are provided with locking structures matched with the latch heads.

5. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 4, wherein: the locking structure comprises a through hole matched with the fixed fan top plate, the fixed fan bottom plate and the middle supporting plate and a limiting ring matched with the centering fixing rod, wherein the through hole is formed in the middle of the front latch base side plate and the rear latch base side plate, the through hole is a round hole, two arc limiting plates are arranged inside the through hole of the front latch base side plate, the inner arc surfaces of the two arc limiting plates are oppositely arranged up and down, and the two arc limiting plates are respectively connected with the inner wall of the through hole through a first connecting piece; the limiting ring is arranged in the middle of the outer arc surface of the arc limiting plate; a centering ring matched with the limiting ring is arranged in the middle of the arc-shaped edge of the fan-shaped plate of the fixed fan top plate, and an inner hole of the centering ring is matched with the centering fixing rod;

during the use, pass the via hole of the fixed fan bottom plate of bolt head and backup pad in proper order in the past back bolt socket curb plate and get into inside and rotatory 90 of base and bolt socket, fixed fan roof pushes away to hug closely the back with anterior bolt socket curb plate, inserts the centering ring of fixed fan roof and the spacing intra-annular of anterior via hole with the centering dead lever for the rotation of restriction bolt head.

6. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 5, wherein: the base includes four end to end's base curb plate, the base curb plate links to each other with the four sides one-to-one of rear portion latch seat curb plate, spacing reinforced structure sets up inside the base curb plate.

7. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 6, wherein: the limiting and reinforcing structure comprises two fixed arc plates which are oppositely arranged, arc grooves of the two fixed arc plates are oppositely arranged, the arc grooves of the fixed arc plates are matched with the edges of the fan-shaped plates of the fixed fan bottom plate, and the back surfaces of the fixed arc plates are connected with the upper base side plate and the lower base side plate through second connecting pieces.

8. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 7, wherein: the first connecting pieces and the second connecting pieces are four and are pairwise arranged, the upper pair of first connecting pieces and the lower pair of first connecting pieces are fixed on the inner walls of the upper cover plate and the lower cover plate at intervals in parallel, and the upper pair of second connecting pieces and the lower pair of second connecting pieces are fixed on the inner walls of the top base side plate and the bottom base side plate at intervals in parallel.

9. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in claim 3, wherein: the bolt core is in a long rod shape, and ribbed plates are arranged between the side surfaces of the fixed sash top plate, the fixed sash bottom plate and the middle support plate and the bolt core.

10. The bolt anchor connecting node for the open cut foundation pit purlin enclosing structure as claimed in any one of claims 4-9, wherein: the right latch base side plate is connected with the enclosing purlin component through a first connecting steel plate and a second connecting steel plate, connecting holes matched with bolts are formed in the first connecting steel plate and the second connecting steel plate, the first connecting steel plate is arranged between the right latch base side plate and the enclosing purlin component, the first connecting steel plate and the end portion of the enclosing purlin component are fixedly welded, the second connecting steel plate is arranged in front of the front latch base side plate and the enclosing purlin component, and the first connecting steel plate and the second connecting steel plate are connected with the front latch base side plate and the enclosing purlin component through bolts respectively;

the purlin surrounding conversion piece is a hollow cylinder body, the middle part of the purlin surrounding conversion piece is vertically provided with a conversion piece partition plate, the purlin surrounding conversion piece is formed by connecting four conversion piece side plates at the front, the back, the left and the right, and the left and the right conversion piece side plates are respectively connected with a left latch base side plate and a purlin surrounding component through bolts; similarly, a first connecting steel plate is arranged between the left enclosing purlin component and the enclosing purlin conversion piece, the first connecting steel plate and the end part of the enclosing purlin component are welded and fixed in advance, and a second connecting steel plate is arranged at the front part of the front latch seat side plate, the enclosing purlin component and the front part of the enclosing purlin component; the first connecting steel plate and the enclosing purlin conversion piece are fixedly connected through the bolt, and the front conversion piece side plate and the front latch seat side plate as well as the front conversion piece side plate and the enclosing purlin component are fixedly connected through the bolt and the two second connecting steel plates respectively.

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