CN109487792B - Temporary stress system conversion method for lattice column underpinning and matched adjustable device - Google Patents
Temporary stress system conversion method for lattice column underpinning and matched adjustable device Download PDFInfo
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- CN109487792B CN109487792B CN201811221755.9A CN201811221755A CN109487792B CN 109487792 B CN109487792 B CN 109487792B CN 201811221755 A CN201811221755 A CN 201811221755A CN 109487792 B CN109487792 B CN 109487792B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 16
- 238000009424 underpinning Methods 0.000 title claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 22
- 238000010276 construction Methods 0.000 abstract description 20
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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Abstract
The invention relates to the technical field of building construction, and aims to provide a temporary stress system conversion method for lattice column underpinning and a matched adjustable device, which are suitable for different foundation pits, and have relatively simple mounting and dismounting procedures, so that the construction period is saved, the operation difficulty of construction is reduced, and the construction cost is reduced. The conversion method comprises the following steps: (1) installing a fixing device; (2) installing a spherical hinge device; (3) installing a pressure-bearing diagonal rod and a tension horizontal rod; (4) cutting off the lattice column which needs to be cut off. Meanwhile, an adjustable device suitable for the temporary stress system conversion method is provided, which comprises the following components: the device comprises a plurality of fixing devices, spherical hinges, spherical hinge fixing rings, a plurality of pressure-bearing telescopic rods and a plurality of tension telescopic rods, wherein the number of the spherical hinges is the same as that of the fixing devices, and the spherical hinge fixing rings are the same as that of the spherical hinges.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a temporary stress system conversion method for lattice column underpinning and a matched adjustable device.
Background
The lattice column is a temporary vertical force transmission structure in foundation pit engineering, and plays a vital role in ensuring the safety of the foundation pit. In some cases it may be desirable to sever one or more heel latticed posts to meet construction needs: 1. the lattice column collides with the formal concrete structure; 2. the lattice columns hinder other construction procedures; 3. other special cases. If the lattice column is directly cut off, the vertical load on the upper part cannot be transmitted to the ground through normal stress, and the whole foundation pit collapses when severe, so that a certain measure is needed to be taken to convert a stress system before the lattice column is cut off, and the vertical load can be smoothly transmitted to the ground through other modes.
At present, two main methods for converting a stress system of a lattice column exist in construction sites and some related patents: 1. the construction is affected by the wide-range position of the lattice column, such as the position of the lattice column just in the shield passing position when the shield passes in the subway station. At this time, referring to the idea of truss conversion layer, a truss structure is built at the lattice column position on the lattice column to be cut off by using section steel in a welding mode, and vertical load is transferred to the adjacent lattice column and then transferred to the ground. 2. The small range of locations where the catheter Guan Gegou post is located affects normal construction. In this case, in addition to the method described in the first case, the vertical load can be transmitted to the ground through the upper layer lattice column and the supporting lattice column by building the supporting lattice column on the left and right sides of the cut temporary lattice column until the cut height.
The two methods can realize the conversion of a stress system and ensure the construction safety. But whether building temporary truss structures or bracing lattice columns, there are problems: different foundation pits, different distances of lattice columns and different layer heights, and then the temporary structure sizes are completely different. In this case, it is often necessary to manufacture a temporary structure or cut steel at a construction site according to the size, which not only prolongs the construction period, but also increases the difficulty of later dismantling.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a temporary stress system conversion method for lattice column underpinning, which is suitable for different foundation pits, and has relatively simple mounting and dismounting procedures, thereby saving the construction period, reducing the operation difficulty of construction and reducing the construction cost.
The invention further aims to provide an adjustable device for converting a temporary stress system for underpinning of prefabricated lattice columns, which is suitable for different foundation pits, and is relatively simple to install and disassemble, so that the construction period is saved, the operation difficulty of construction is reduced, the device can be reused, and the construction cost is reduced.
The invention aims at realizing the following technical scheme:
a temporary stress system conversion method for lattice column underpinning comprises the following steps:
(1) And (3) installing and fixing devices:
the method comprises the steps that a fixing device is respectively arranged at the bottom and the top of a layer of lattice column above a lattice column to be cut, and a fixing device is respectively arranged at the bottom of each adjacent lattice column at two sides of the lattice column above the lattice column to be cut;
a semicircular hole is formed in one surface, facing the outside, of the fixing device, and a tension fixing piece is arranged below the semicircular hole and is of a hole-shaped or annular structure suitable for hooking.
(2) Installing a spherical hinge device:
installing a spherical hinge device on each of the fixing devices installed in the step (1);
the spherical hinge device comprises a spherical hinge and a spherical hinge fixing ring, wherein a spherical base of the spherical hinge is rotatably arranged in the semicircular hole and is fixed through the spherical hinge fixing ring, and a connecting screw rod extends out of the spherical base.
(3) Installing a pressure-bearing diagonal rod and a tension horizontal rod:
a pressure-bearing inclined rod is connected between a fixing device at the top of a layer of lattice column right above the lattice column to be cut and a fixing device at the bottom of the lattice column outside the lattice column, and two ends of the pressure-bearing inclined rod are respectively connected with a connecting screw rod of a spherical hinge on the fixing device in a threaded manner;
connecting a tension horizontal rod with the length smaller than the distance between the two fixing devices between the fixing device of the bottom of the immediately upper layer of lattice column and the fixing device of the bottom of the lattice column on the outer side of the lattice column to be cut, wherein two ends of the tension horizontal rod are respectively provided with a high-stiffness spring and are connected to tension fixing pieces of the corresponding fixing devices through the Gao Jindu springs;
if the lattice columns to be cut are two or more lattice columns arranged adjacently, then: the fixing devices at the top of the immediately upper layer of the lattice column of each lattice column needing to be cut are sequentially connected with a pressure-bearing inclined rod in a threaded manner, and the fixing devices at the bottom of the immediately upper layer of the lattice column of each lattice column needing to be cut are sequentially connected with a tension horizontal rod with the length smaller than the distance between the two fixing devices through high stiffness springs.
(4) And cutting off the lattice column to be cut off.
If a plurality of lattice columns which are not adjacently arranged are required to be cut off, repeating the steps.
According to the temporary stress system conversion method, the pressure-bearing inclined rod is formed by connecting 2n+1 sections of pressure-bearing small rods through the locking sleeve in sequence, and n is more than or equal to 1. All odd-numbered section pressure-bearing small rods are cavity rods with the same outer diameter and inner diameter, wherein: one end of the pressure-bearing small rod positioned at the two ends is a solid end, an internal thread matched with the connecting screw rod of the spherical hinge is arranged in the solid end, and the outer wall of the other end is provided with a connecting thread; the two ends of the other odd-numbered section pressure-bearing small rods except the pressure-bearing small rods at the two ends are cavities, and the outer walls of the two ends are provided with cavity rods with connecting threads. All even-numbered sections of pressure-bearing small rods are screw rods with the same outer diameter and slightly smaller than the inner diameters of the pressure-bearing small rods at the two ends. The pressure-bearing small rods of each section are sequentially connected end to end through a locking sleeve, the inner cavity of the locking sleeve is divided into two sections with different inner diameters, the inner diameter of one section is matched with the outer diameter of the pressure-bearing small rod of the odd section, the inner diameter of the other section is matched with the outer diameter of the pressure-bearing small rod of the even section, locking threads are arranged on the inner walls of the two sections, and the locking threads on the inner walls of the sections are respectively matched with threads on the outer walls of the sections corresponding to the locking threads.
According to the temporary stress system conversion method, the tension horizontal rod is formed by connecting 2m+1 sections of tension small rods through the locking sleeve in sequence, and m is more than or equal to 1. All odd sections of tension rods are cavity rods with the same outer diameter and inner diameter, wherein: one end of the tension small rod at two ends is a solid end, a tension fixing piece is arranged in the solid end, the tension fixing piece is of a hole-shaped or annular structure suitable for hooking, and the outer wall of the other end is provided with connecting threads; the two ends of the other odd-numbered tension rods except the tension rods at the two ends are cavities, and the outer walls of the two ends are provided with cavity rods with connecting threads. All the tension rods in even sections are screw rods with the same outer diameter and slightly smaller than the inner diameters of the tension rods at the two ends. The tension rods of the two sections are sequentially connected end to end through locking sleeves, the inner cavity of each locking sleeve is divided into two sections with different inner diameters, the inner diameter of one section is matched with the outer diameter of the tension rod of the odd section, the inner diameter of the other section is matched with the outer diameter of the tension rod of the even section, locking threads are arranged on the inner walls of the two sections, and the locking threads on the inner walls of the sections are respectively matched with threads on the outer walls of the sections corresponding to the locking threads. The two ends of the tensile horizontal rod are respectively provided with a high-stiffness spring and are connected to the tensile fixing members of the corresponding fixing devices through the Gao Jindu springs, two ends of the Gao Jindu springs are respectively provided with a hook, one hook is used for being hung on the tensile fixing member on the tensile horizontal rod, and the other hook is used for being hung on the tensile fixing member on the connecting fixing device.
An adjustable device suitable for the temporary stress system conversion method comprises the following steps: the device comprises a plurality of fixing devices, spherical hinges, spherical hinge fixing rings, a plurality of pressure-bearing telescopic rods and a plurality of tension telescopic rods, wherein the number of the spherical hinges is the same as that of the fixing devices, and the spherical hinge fixing rings are the same as that of the spherical hinges.
A semicircular hole is formed in one surface, facing the outside, of each fixing device, and a tension fixing piece is arranged below the semicircular hole and is of a hole-shaped or annular structure suitable for hooking.
Each spherical hinge is rotatably fixed on the fixing device and comprises a spherical base and a connecting screw rod extending out of the spherical base, and the spherical base is matched with the size of the semicircular hole.
The spherical hinge fixing ring is sleeved outside the spherical hinge and is fixed on the fixing device, so that the spherical base of the spherical hinge can rotate in the semicircular hole.
The two ends of the pressure-bearing telescopic rod are respectively connected with the connecting screw rods of the spherical hinges on the corresponding fixing devices in a threaded manner and are rotatably fixed on the fixing devices through the spherical hinges.
The length of the tension telescopic rod is smaller than the horizontal distance between the two corresponding fixing devices, and the two ends of the tension telescopic rod are connected to tension fixing holes on the corresponding fixing devices through a high-stiffness spring respectively.
Further, each pressure-bearing telescopic rod is formed by connecting 2n+1 sections of pressure-bearing small rods through locking sleeves in sequence, and n is more than or equal to 1. All odd-numbered section pressure-bearing small rods are cavity rods with the same outer diameter and inner diameter, wherein: one end of the pressure-bearing small rod positioned at the two ends is a solid end, an internal thread matched with the connecting screw rod of the spherical hinge is arranged in the solid end, and the outer wall of the other end is provided with a connecting thread; the two ends of the other odd-numbered section pressure-bearing small rods except the pressure-bearing small rods at the two ends are cavities, and the outer walls of the two ends are provided with cavity rods with connecting threads. All even-numbered sections of pressure-bearing small rods are screw rods with the same outer diameter and slightly smaller than the inner diameters of the pressure-bearing small rods at the two ends. The pressure-bearing small rods of each section are sequentially connected end to end through a locking sleeve, the inner cavity of the locking sleeve is divided into two sections with different inner diameters, the inner diameter of one section is matched with the outer diameter of the pressure-bearing small rod of the odd section, the inner diameter of the other section is matched with the outer diameter of the pressure-bearing small rod of the even section, locking threads are arranged on the inner walls of the two sections, and the locking threads on the inner walls of the sections are respectively matched with threads on the outer walls of the sections corresponding to the locking threads.
Further, each acceptance telescopic rod is formed by connecting 2m+1 sections of tension small rods through a locking sleeve in sequence, and m is more than or equal to 1. All odd sections of tension rods are cavity rods with the same outer diameter and inner diameter, wherein: one end of the tension small rod at two ends is a solid end, a tension fixing piece is arranged in the solid end, the tension fixing piece is of a hole-shaped or annular structure suitable for hooking, and the outer wall of the other end is provided with connecting threads; the two ends of the other odd-numbered tension rods except the tension rods at the two ends are cavities, and the outer walls of the two ends are provided with cavity rods with connecting threads. All the tension rods in even sections are screw rods with the same outer diameter and slightly smaller than the inner diameters of the tension rods at the two ends. The tension rods of the two sections are sequentially connected end to end through locking sleeves, the inner cavity of each locking sleeve is divided into two sections with different inner diameters, the inner diameter of one section is matched with the outer diameter of the tension rod of the odd section, the inner diameter of the other section is matched with the outer diameter of the tension rod of the even section, locking threads are arranged on the inner walls of the two sections, and the locking threads on the inner walls of the sections are respectively matched with threads on the outer walls of the sections corresponding to the locking threads. The two ends of the tension telescopic rod are respectively provided with a high-stiffness spring and are connected to the tension fixing members of the corresponding fixing devices through the Gao Jindu springs, two ends of the Gao Jindu springs are respectively provided with a hook, one hook is used for being hung on the tension fixing member on the tension telescopic rod, and the other hook is used for being hung on the tension fixing member on the fixing device connected with the hook.
The fixing device is provided with fixing holes for fixing the fixing device on the corresponding lattice column through bolts and nuts.
And the periphery of the semicircular ball hole is provided with a ball hinge fixing hole used for fixing the ball hinge fixing ring on the fixing device. Preferably, a fixing ring hole is arranged on the ring body of the spherical hinge fixing sleeve, and the fixing ring hole corresponds to the spherical hinge fixing hole.
Preferably, a fixing block is arranged below the semicircular ball hole, and the tension fixing hole is a hole which is dug downwards from the upper surface of the fixing block.
The invention adopts the structure, so that compared with the prior art, the invention has the following beneficial effects: in actual construction, all lattice columns cannot be completely in one direction, and when two corresponding faces are not parallel, the direction can be adjusted through the spherical hinge; before the lattice column is cut off, the stress system of the lattice column is converted through the adjustable device, and the components are properly adjusted through the adjustable device, so that the requirements of foundation pits with different sizes can be met, the same set of devices can be reused, and the construction period and the expenditure are saved; in addition, the components can be connected by bolts or matched by threads, so that the installation and the disassembly are convenient, and the construction steps are simplified; pretension can be provided by high stiffness springs, avoiding shear failure of the lattice column due to horizontal forces. In general, the shortcomings of the existing methods are overcome, and the problem of underpinning of most lattice columns can be solved.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of an adjustable device used in the method for converting a temporary force system according to the present invention.
Fig. 2 is a schematic structural view of the fixing device of the embodiment shown in fig. 1, wherein fig. 2 (a) is a fixing plate, fig. 2 (b) is a spherical hinge, and fig. 2 (c) is a spherical hinge fixing ring.
Fig. 3 is a schematic structural view of the telescopic rod of the embodiment shown in fig. 1, wherein fig. 3 (a) is a schematic structural view of a first (third) section of the pressure-bearing telescopic rod, fig. 3 (b) is a schematic structural view of a second section of the pressure-bearing and tension telescopic rod, and fig. 3 (c) is a schematic structural view of a first (third) section of the tension telescopic rod.
Fig. 4 is a schematic cross-sectional view of the telescopic rod locking sleeve of the embodiment shown in fig. 1.
FIG. 5 is a schematic illustration of the structure of the high stiffness spring of the embodiment shown in FIG. 1.
Fig. 6 is a schematic structural view of another alternative embodiment of the telescopic rod of the adjustable device of the present invention, wherein fig. 6 (a) is a schematic structural view of a first (fifth) section of a bearing telescopic rod, fig. 6 (b) is a schematic structural view of a second (fourth) section of a bearing and tension telescopic rod, and fig. 6 (c) is a schematic structural view of a first (fifth) section of a tension telescopic rod; fig. 6 (d) is a schematic cross-sectional structure of the third section of the compression and tension telescopic rod.
FIG. 7 is a schematic diagram of another preferred embodiment of an adjustable device used in the method for converting a temporary force system according to the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples. The advantages and features of the present invention will become more apparent in conjunction with the following description. It should be noted that the embodiments of the present invention have a preferred implementation, but are not limited to the present invention, and the technical features or the combination of technical features described in the present embodiment should not be considered as being isolated, and they may be combined with each other to achieve a better technical effect. Additional implementations may be included within the scope of the preferred embodiments of the present invention and should be understood by those skilled in the art to which the embodiments of the present invention pertain.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative and not limitative. Thus, other examples of the exemplary embodiments may have different values.
The drawings of the invention are in a very simplified form and are not to scale precisely, but are for the purpose of illustrating embodiments of the invention conveniently and clearly, and are not intended to limit the scope of the invention. Any structural modification, proportional change or size adjustment should fall within the scope of the technical disclosure without affecting the effects and the achieved objects of the present invention. And the same reference numerals appearing in the drawings of the present invention denote the same features or elements, and may be used in different embodiments. Meanwhile, the words of description such as "upper, lower, left, right" and the like of the azimuth are merely for clarity of description, but are not intended to limit the scope of the invention, and the relative relation is changed or adjusted without substantial change of technical content, and are considered as the scope of the invention.
As shown in fig. 1, a fixing device 4 is respectively arranged at the top and the bottom of the upper layer of lattice column 2 of the lattice column 1 to be cut, and a fixing device 4 is respectively arranged at the bottom of the left adjacent lattice column 3-1 and the right adjacent lattice column 3-2 of the upper layer of lattice column 2. A spherical hinge 5 is fixed on each fixing device 4 through a spherical hinge fixing ring 6.
The manner of attachment of the securing device 4 is described in detail below in connection with fig. 2 (a) - (c). As shown in fig. 2 (a), the fixing device 4 is provided with two rows of fixing holes 4-2, and bolts and nuts can pass through the fixing holes 4-2 to fix the fixing device 4 on the corresponding lattice columns. The fixing device 4 is provided with a semicircular ball hole 4-1, the size of the semicircular ball hole 4-1 is matched with that of a spherical base of the spherical hinge 5, a circle of spherical hinge fixing holes 4-3 are formed in the periphery of the semicircular ball hole 4-1, the spherical base of the spherical hinge 5 is arranged in the semicircular ball hole 4-1 of the fixing device 4, the spherical hinge fixing ring 6 is sleeved outside the spherical hinge 5, the fixing ring hole 6-1 on the spherical hinge fixing ring 6 corresponds to the spherical hinge fixing hole 4-3 on the fixing device 4, the spherical hinge fixing ring 6 is fixed on the fixing device 4 through bolts, and the spherical base of the spherical hinge 5 can rotate in the semicircular ball hole 4-1. And repeating the steps to finish the installation of the four fixing devices and the matched spherical hinges. A fixing block is arranged at the lower part of the spherical hinge fixing hole 4-3, and a tension fixing hole 4-4 is arranged on the upper surface of the fixing block.
The pressure-bearing telescopic rod 7 comprises a first pressure-bearing telescopic rod section 7-1, a second pressure-bearing telescopic rod section 7-2 and a third pressure-bearing telescopic rod section 7-3, and the sections are sequentially connected end to end through a locking sleeve 9. The first section 7-1 of the pressure-bearing telescopic rod and the third section 7-3 of the pressure-bearing telescopic rod are symmetrical in structure and are hollow rods with solid ends at one end. The second section 7-2 of the pressure-bearing telescopic rod is a screw rod, and the outer diameter of the screw rod is slightly smaller than the inner diameters of the first section 7-1 of the pressure-bearing telescopic rod and the third section 7-3 of the pressure-bearing telescopic rod.
As shown in fig. 3, the solid end of the first section 7-1 of the pressure-bearing telescopic rod (i.e. one end of the pressure-bearing telescopic rod 7) and the solid end of the third section 7-3 of the pressure-bearing telescopic rod (i.e. the other end of the pressure-bearing telescopic rod 7) are respectively provided with internal threads 7-1-1 and 7-3-1, the outer wall of the other end is provided with connecting threads 7-1-2 and 7-3-2, and the internal threads 7-1-1 and 7-3-1 are matched with the threads on the connecting screw rod 5-1 of the spherical hinge 5, so as to connect the pressure-bearing telescopic rod 7 between the two fixing devices 4 in a threaded manner. The inner cavity of the locking sleeve 9 is divided into two parts with different inner diameters, the two parts are respectively matched with the outer diameter of a first section 7-1 (a third section 7-3) of the pressure-bearing telescopic rod and the outer diameter of a second section 7-2 of the pressure-bearing telescopic rod, and locking threads 9-1 and 9-2 are respectively arranged on the inner walls of the two parts and are respectively matched with threads on the outer walls of the corresponding sections.
The pressure-bearing telescopic rod 7 is used for being supported between the fixing device of the top of the upper layer of the lattice column 2 of the lattice column 1 to be cut and the fixing device of the bottoms of the two adjacent lattice columns 3-1 and 3-2 of the upper layer of the lattice column 2. When the telescopic rod is used, the distance between the two fixing devices is measured, the second section 7-2 of the telescopic rod is arranged at the hollow ends of the first section 7-1 and the third section 7-3 of the telescopic rod according to the distance between the two points, and the telescopic length is micro-adjusted through the locking sleeve 9 and then is locked through threads.
And repeating the steps to finish the installation of all the pressure-bearing telescopic rods.
The tension telescopic rod 8 comprises a tension telescopic rod first section 8-1, a tension telescopic rod second section 8-2 and a tension telescopic rod third section 8-3, and all the sections are connected end to end in sequence through a locking sleeve 9. The first section 8-1 of the tension telescopic rod and the third section 8-3 of the tension telescopic rod are symmetrical in structure and are hollow rods with solid ends at one end. The second section 8-2 of the tension telescopic rod is a screw rod, and the outer diameter of the screw rod is slightly smaller than the inner diameters of the first section 8-1 of the tension telescopic rod and the third section 8-3 of the tension telescopic rod.
As shown in fig. 3, the solid end of the first section 8-1 of the tension telescopic rod (i.e. one end of the tension telescopic rod 8) and the solid end of the third section 8-3 of the tension telescopic rod (i.e. the other end of the tension telescopic rod 8) are respectively provided with a tension fixing hole 8-1-1 and 8-3-1, and the outer wall of the other end is provided with connecting threads 8-1-2 and 8-3-2. The inner cavity of the locking sleeve 9 is divided into two parts with different inner diameters, the two parts are respectively matched with the outer diameter of a first section 8-1 of the tension telescopic rod (a third section 8-3 of the tension telescopic rod) and the outer diameter of a second section 8-2 of the tension telescopic rod, and locking threads 9-1 and 9-2 are respectively arranged on the inner walls of the two parts and are respectively matched with threads on the outer walls of the corresponding sections.
The tension telescopic rod 8 is used for being supported between the fixing device of the bottom of the upper layer of the lattice column 2 of the lattice column 1 to be cut and the fixing device of the bottom of the adjacent two lattice columns 3-1 and 3-2 of the upper layer of the lattice column 2. In use, the distance between the two fixing devices is measured, the sections of the tension telescopic rod 8 are assembled together through the locking sleeve 9, the length of the assembled tension telescopic rod 8 is smaller than the distance between the two fixing devices, and the assembled tension telescopic rod 8 is fixed between the two fixing devices through the two high-stiffness springs 10. The structure of the high stiffness spring 10 is shown in FIG. 4 and includes a hook 10-1 and a hook 10-2. The hooks 10-1 and 10-2 of one high stiffness spring 10 are respectively hung on the tension fixing hole 4-4 on one fixing device 4 and the tension fixing hole 8-1-1 on the first section 8-1 of the tension telescopic rod, and the hooks 10-1 and 10-2 of the other high stiffness spring 10 are respectively hung on the tension fixing hole 4-4 on the other fixing device 4 and the tension fixing hole 8-3-1 on the third section 8-3 of the tension telescopic rod. Since the length of the assembled tension telescopic rod 8 is smaller than the distance between the two fixing devices, a certain initial elongation exists for the high-stiffness spring 10 all the time, and the whole tension telescopic rod is pre-stressed.
And repeating the steps to finish the installation of all the tension telescopic rods.
After all the installation is completed, the lattice column 1 to be cut is cut off as shown in fig. 1.
In the above embodiment, each pressure-bearing rod or each pressure-receiving rod consists of three sections, and in actual engineering, according to the size of the foundation pit, the distance between lattice columns and the layer height, the pressure-bearing rods or the pressure-receiving rods can be selectively connected, i.e. each pressure-bearing rod or each pressure-receiving rod can consist of more sections according to the length requirement; for example, in the configuration shown in fig. 6, each of the compression and compression bars is composed of five segments, wherein the even-numbered segments are configured to correspond to the three-segment configuration shown in fig. 3, and the odd-numbered segments are configured to be fully hollow.
The pressure-bearing telescopic rod 7 comprises a first pressure-bearing telescopic rod section 7-1', a second pressure-bearing telescopic rod section 7-2', a third pressure-bearing telescopic rod section 7-3', a fourth pressure-bearing telescopic rod section 7-4' and a fifth pressure-bearing telescopic rod section 7-5', and all the sections are connected end to end in sequence through a locking sleeve 9. The first section 7-1 'of the pressure-bearing telescopic rod, the third section 7-3' of the pressure-bearing telescopic rod and the fifth section 7-5 'of the pressure-bearing telescopic rod are hollow rods with the same inner diameter and outer diameter, and the second section 7-2' of the pressure-bearing telescopic rod and the fourth section 7-4 'of the pressure-bearing telescopic rod are all screw rods with the same outer diameter and slightly smaller than the inner diameter of the first section 7-1' of the pressure-bearing telescopic rod. The first section 7-1 'of the pressure-bearing telescopic rod and the fifth section 7-5' of the pressure-bearing telescopic rod are symmetrical in structure and are hollow rods with solid ends at one end. The solid end part of the first section 7-1 'of the pressure-bearing telescopic rod (namely one end of the pressure-bearing telescopic rod 7) and the solid end part of the fifth section 7-5' of the pressure-bearing telescopic rod (namely the other end of the pressure-bearing telescopic rod 7) are respectively provided with internal threads 7-1'-1 and 7-5' -1, the outer wall of the other end is provided with connecting threads 7-1'-2 and 7-5' -2, and the internal threads 7-1'-1 and 7-5' -1 are matched with the threads on the connecting screw rod 5-1 of the spherical hinge 5. The third section 7-3 'of the pressure-bearing telescopic rod is a cavity rod with connecting threads 7-3' -1 on the outer walls of the two ends.
The tension telescopic rod 8 comprises a tension telescopic rod first section 8-1', a tension telescopic rod second section 8-2', a tension telescopic rod third section 8-3', a tension telescopic rod fourth section 8-4' and a tension telescopic rod fifth section 8-5', and all the sections are connected end to end in sequence through a locking sleeve 9. The first section 8-1 'of the tension telescopic rod, the third section 8-3' of the tension telescopic rod and the fifth section 8-5 'of the tension telescopic rod are hollow rods with the same inner diameter and outer diameter, and the second section 8-2' of the tension telescopic rod and the fourth section 8-4 'of the tension telescopic rod are all screw rods with the same outer diameter and slightly smaller than the inner diameter of the first section 8-1' of the tension telescopic rod. The first section 8-1 'of the tension telescopic rod and the fifth section 8-5' of the tension telescopic rod are symmetrical in structure and are hollow rods with solid ends at one end. The third section 8-3 'of the tension telescopic rod is a cavity rod with connecting threads 8-3' -1 on the outer walls of the two ends.
As shown in fig. 7, when two or more lattice columns are arranged adjacently, the lattice columns to be cut are formed. The lattice columns to be cut off in this embodiment are two adjacent arranged lattice columns 1-1 and 1-2. Therefore, in this embodiment, the mounting structure of each of the pressure-bearing expansion rods 7 and the tension expansion rods 8 is changed from a triangular stress structure to a trapezoidal stress structure, as shown in fig. 7, one fixing device 4 is respectively provided at the top and bottom of the upper layer of lattice columns 2-1 and 2-2 to be cut off the lattice columns 1-1 and 1-2, and one fixing device 4 is respectively provided at the bottom of the left adjacent lattice column 3-1 of the lattice column 2-1 and the right adjacent lattice column 3-2 of the lattice column 2-2. A spherical hinge 5 is fixed on each fixing device 4 through a spherical hinge fixing ring 6. At the moment, the left inclined rod, the right inclined rod and the top horizontal rod are both pressure-bearing telescopic rods 7, and the bottom three horizontal rods are both tension telescopic rods 8. The assembly and installation steps of the fixing devices 4, the compression telescopic rods 7 and the tension telescopic rods 8 are the same as those of the embodiment shown in fig. 1.
Claims (3)
1. The temporary stress system conversion method for lattice column underpinning is characterized by comprising the following steps of:
(1) And (3) installing and fixing devices:
the method comprises the steps that a fixing device is respectively arranged at the bottom and the top of a layer of lattice column above a lattice column to be cut, and a fixing device is respectively arranged at the bottom of each adjacent lattice column at two sides of the lattice column above the lattice column to be cut;
a semicircular hole is formed in one surface of the fixing device facing the outside, a tension fixing piece is arranged below the semicircular hole, and the tension fixing piece is of a hole-shaped or annular structure suitable for hooking;
(2) Installing a spherical hinge device:
installing a spherical hinge device on each of the fixing devices installed in the step (1);
the spherical hinge device comprises a spherical hinge and a spherical hinge fixing ring, a spherical base of the spherical hinge is rotatably arranged in the semicircular hole and is fixed through the spherical hinge fixing ring, and a connecting screw rod extends out of the spherical base;
(3) Installing a pressure-bearing diagonal rod and a tension horizontal rod:
a pressure-bearing inclined rod is connected between a fixing device at the top of a layer of lattice column right above the lattice column to be cut and a fixing device at the bottom of the lattice column outside the lattice column, and two ends of the pressure-bearing inclined rod are respectively connected with a connecting screw rod of a spherical hinge on the fixing device in a threaded manner;
connecting a tension horizontal rod with the length smaller than the distance between the two fixing devices between the fixing device of the bottom of the immediately upper layer of lattice column and the fixing device of the bottom of the lattice column on the outer side of the lattice column to be cut, wherein two ends of the tension horizontal rod are respectively provided with a high-stiffness spring and are connected to tension fixing pieces of the corresponding fixing devices through the Gao Jindu springs;
if the lattice columns to be cut are two or more lattice columns arranged adjacently, then: the fixing devices at the top of the immediately upper layer of the lattice column of each lattice column to be cut are sequentially connected with a pressure-bearing inclined rod in a threaded manner, and the fixing devices at the bottom of the immediately upper layer of the lattice column of each lattice column to be cut are sequentially connected with a tension horizontal rod with the length smaller than the distance between the two fixing devices through a high stiffness spring;
(4) And cutting off the lattice column to be cut off.
2. The temporary stress system conversion method according to claim 1, wherein the pressure-bearing diagonal rods are formed by connecting 2n+1 sections of pressure-bearing small rods through locking sleeves in sequence, and n is more than or equal to 1;
all odd-numbered section pressure-bearing small rods are cavity rods with the same outer diameter and inner diameter, wherein: one end of the pressure-bearing small rod positioned at the two ends is a solid end, an internal thread matched with the connecting screw rod of the spherical hinge is arranged in the solid end, and the outer wall of the other end is provided with a connecting thread; the two ends of the other odd-numbered section pressure-bearing small rods except the pressure-bearing small rods positioned at the two ends are cavities, and the outer walls of the two ends are provided with cavity rods with connecting threads;
all even-numbered sections of pressure-bearing small rods are screw rods with the same outer diameter and slightly smaller than the inner diameters of the pressure-bearing small rods at the two ends;
the pressure-bearing small rods of each section are sequentially connected end to end through a locking sleeve, the inner cavity of the locking sleeve is divided into two sections with different inner diameters, the inner diameter of one section is matched with the outer diameter of the pressure-bearing small rod of the odd section, the inner diameter of the other section is matched with the outer diameter of the pressure-bearing small rod of the even section, locking threads are arranged on the inner walls of the two sections, and the locking threads on the inner walls of the sections are respectively matched with threads on the outer walls of the sections corresponding to the locking threads.
3. The temporary stress system conversion method according to claim 1, wherein the tension horizontal rod is formed by connecting 2m+1 sections of tension small rods through locking sleeves in sequence, and m is more than or equal to 1;
all odd sections of tension rods are cavity rods with the same outer diameter and inner diameter, wherein: one end of the tension small rod at two ends is a solid end, a tension fixing piece is arranged in the solid end, the tension fixing piece is of a hole-shaped or annular structure suitable for hooking, and the outer wall of the other end is provided with connecting threads; the two ends of the other odd-numbered sections of tension small rods except the tension small rods at the two ends are cavities, and the outer walls of the two ends are provided with cavity rods with connecting threads;
all the tension rods in even sections are screw rods with the same outer diameter and slightly smaller than the inner diameters of the tension rods at the two ends;
the tension rods of the two sections are sequentially connected end to end through a locking sleeve, the inner cavity of the locking sleeve is divided into two sections with different inner diameters, the inner diameter of one section is matched with the outer diameter of the tension rod of the odd section, the inner diameter of the other section is matched with the outer diameter of the tension rod of the even section, locking threads are arranged on the inner walls of the two sections, and the locking threads on the inner walls of the sections are respectively matched with the threads on the outer walls of the sections corresponding to the locking threads;
the two ends of the tensile horizontal rod are respectively provided with a high-stiffness spring and are connected to the tensile fixing members of the corresponding fixing devices through the Gao Jindu springs, two ends of the Gao Jindu springs are respectively provided with a hook, one hook is used for being hung on the tensile fixing member on the tensile horizontal rod, and the other hook is used for being hung on the tensile fixing member on the connecting fixing device.
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| CN201811221755.9A CN109487792B (en) | 2018-10-19 | 2018-10-19 | Temporary stress system conversion method for lattice column underpinning and matched adjustable device |
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| CN201811221755.9A CN109487792B (en) | 2018-10-19 | 2018-10-19 | Temporary stress system conversion method for lattice column underpinning and matched adjustable device |
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| CN109487792A (en) | 2019-03-19 |
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