CN107806101B - Construction method for strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam - Google Patents

Construction method for strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam Download PDF

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Publication number
CN107806101B
CN107806101B CN201711051893.2A CN201711051893A CN107806101B CN 107806101 B CN107806101 B CN 107806101B CN 201711051893 A CN201711051893 A CN 201711051893A CN 107806101 B CN107806101 B CN 107806101B
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concrete
connecting beam
embedded
prefabricated
precast
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CN107806101A (en
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张中杰
刘书
吕培林
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Shanghai Urban Construction Design Research Institute Group Co Ltd
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Shanghai Urban Construction Design Research Institute Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The invention discloses a construction method of a strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam, which is used for connecting the prefabricated connecting beam with the strip foundation pit cast-in-place concrete diagonal bracing, effectively transmitting the internal force of the connecting beam through a connecting structure, and realizing the restraint effect on the cast-in-place concrete diagonal bracing and the effect of strengthening the integrity of a first supporting structure on the premise of meeting the requirements of manufacturing, transportation, installation and the like of prefabricated parts. The stress state of the concrete counter support can be simplified and tends to theoretical analysis, and the rapid installation in site construction is facilitated. Meanwhile, the assembly of the prefabricated parts reduces the workload of later chiseling, realizes the recycling of the prefabricated connecting beam, improves the production efficiency, is green, environment-friendly, energy-saving and emission-reducing, is particularly suitable for the strip foundation pit in a soft soil area, effectively expands the construction means of underground engineering, promotes the technical progress of the industry, and has good economic and social benefits.

Description

Construction method for strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam
Technical Field
The invention relates to the technical field of foundation pit engineering, in particular to a construction method for a strip foundation pit cast-in-place concrete butt-bracing prefabricated connecting beam.
Background
In recent years, with the acceleration of urbanization, in large and medium-sized cities with developed economy and busy traffic, bar-shaped structural engineering construction of various types such as pedestrian crossing passages, subway stations, transfer passages, basement communication passages and the like is in progress in a fierce manner in order to improve regional traffic functions and humanized travel demands. In soft soil areas, such as the upper sea, the first support is often pulled due to the deformation of the foundation pit caused by poor soil quality. Therefore, in the foundation pit review in the areas, the first support is often required to be used as a concrete support and is poured synchronously with the concrete purlin to enhance the integrity. Furthermore, for example, the Shanghai Rail transit management has required that the first support in rail transit be concrete. In addition, in national specifications and most local specifications, a structural definition suggests that when the width of the foundation pit is larger than a certain value, a connecting beam needs to be arranged for enhancing the stability and the integrity of the support.
Practical engineering examples and researches show that the stress of the first concrete support is complex, the stress of the connecting beam is simple, the effect similar to that of the tie bar is only needed to be played, the calculated length of the concrete support is reduced, and the connecting beam and the concrete support are integrally cast by adopting a cast-in-place method in practical engineering. The length that the connection roof beam did not have very strong difference along with foundation ditch width variation like concrete support, and first concrete support is arranged and is not influenced by underground structure, arranges often comparatively freely, and common interval is comparatively solidification, between 8 ~ 9m, and this form and the size of also having decided the connection roof beam are comparatively fixed. Therefore, the method of integrally casting the connecting beam which is relatively simple in stress and relatively fixed with the concrete support in situ can lead the stress of the concrete support to be more complicated on one hand; on the other hand, the repeated utilization of the connecting beam cannot be realized, so that certain waste is undoubtedly caused, the workload of later-stage chiseling is increased, and the production efficiency is reduced, which is contrary to the industrial direction of energy conservation, emission reduction and environmental protection.
Therefore, how to effectively solve the problems, further enrich the method of first supporting in the excavation process of the strip-shaped foundation pit, and improve the production efficiency is a troublesome problem to be solved urgently by technical personnel in the field at present.
Disclosure of Invention
In view of the above defects in the prior art, the technical object of the present invention is to provide a construction method of a strip-shaped foundation pit cast-in-place concrete counter-bracing prefabricated connecting beam, which is characterized in that corresponding connecting structures are reserved in the cast-in-place concrete bracing and the prefabricated connecting beam, and a series of auxiliary technical means such as factory prefabrication and prefabricated component assembly are combined, so as to realize rapid installation in site construction, ensure effective transmission of internal force to form a constraint effect on the concrete bracing, strengthen the integrity of a first bracing structure, and simultaneously realize recycling of the prefabricated connecting beam.
In order to achieve the technical purpose, the invention provides a construction method of a strip foundation pit cast-in-place concrete oppositely-supported prefabricated connecting beam, which comprises the following steps of:
A. prefabricating a connecting beam in a factory: the length of the prefabricated connecting beam is 8-9m, the prefabricated connecting beam with the length of 10 grades is prefabricated in a factory in batches by taking 0.1m added as one grade, and detachable connecting structures fixedly connected with cast-in-place concrete counter supports are arranged at two ends of the prefabricated connecting beam;
B. constructing a foundation pit enclosure structure, a vertical column pile and a temporary steel vertical column;
C. b, performing cast-in-place construction on a concrete purlin and a first concrete diagonal brace, and arranging a detachable connecting structure matched with the prefabricated connecting beam in the step A at the joint of the first concrete diagonal brace and the prefabricated connecting beam;
D. erecting a prefabricated connecting beam between the first concrete opposite supports: selecting prefabricated connecting beams with corresponding length grades according to the distance between the first concrete diagonal braces, hoisting the prefabricated connecting beams after the first concrete diagonal braces reach the design strength, and completing erection and connection between the prefabricated connecting beams and the first concrete diagonal braces;
E. dismantling and recycling the prefabricated connecting beam: and after the construction of the main body structure of the first concrete to the support is completed and the design strength is reached, dismantling the prefabricated connecting beam for recycling, and dismantling the first support system.
Further, the prefabricated connecting beam is a prefabricated concrete connecting beam.
Further, in the step A, through bolt insertion holes are formed in two ends of the precast concrete connecting beam; in the step C, when a first concrete diagonal brace is cast in place, a picking lug is arranged at the joint of the bottoms of the two sides of the first concrete diagonal brace and the precast concrete connecting beam, the picking lug is perpendicular to the first concrete diagonal brace, a picking lug embedded bolt is arranged in the picking lug, the lower part of the picking lug embedded bolt is vertically embedded in the picking lug, an anchoring plate is arranged below the bottom end of the picking lug embedded bolt, and the upper part of the picking lug embedded bolt penetrates out of the picking lug; in the step D, when the precast concrete connecting beam is erected, two ends of the precast concrete connecting beam are respectively erected and placed on the cantilever lugs of the two first concrete opposite supports, the upper parts of the cantilever embedded bolts penetrate through the bolt insertion holes, gaps between the two ends of the precast concrete connecting beam and the first concrete opposite supports are filled and tightly pressed through the polystyrene board filling layer, cement mortar is poured along the bolt insertion holes until grout is emitted, and the erection connection between the precast concrete connecting beam and the first concrete opposite supports is completed after the cement mortar reaches the strength; and E, when the precast concrete connecting beam is dismantled, uniformly applying upward lifting force to the precast concrete connecting beam to lift the precast concrete connecting beam away from the lifting lug, so that the dismantling and recycling of the precast concrete connecting beam can be realized.
Further, in the step a, a hole-side reinforcing rib is further embedded around the bolt insertion hole.
Furthermore, in the step a, connecting beam T-shaped embedded parts are embedded at two ends of the precast concrete connecting beam, each connecting beam T-shaped embedded part comprises a connecting beam flange and a connecting beam web vertically fixed on the connecting beam flange, the connecting beam flanges are vertically embedded in two ends of the precast concrete connecting beam, the connecting beam webs extend out of the precast concrete connecting beam, and the connecting beam webs are provided with bolt holes; in the step C, when a first concrete counter-support is cast in place, a counter-support T-shaped embedded part is embedded in the first concrete counter-support, the counter-support T-shaped embedded part comprises counter-support flanges and counter-support webs vertically fixed on the counter-support flanges, the counter-support flanges are vertically embedded at the connection positions of two sides of the first concrete counter-support and the precast concrete connecting beam, the counter-support webs extend out of the first concrete counter-support, and bolt holes are formed in the counter-support webs; in the step D, when the precast concrete connecting beam is erected, aligning bolt holes on a connecting beam web plate and a diagonal bracing web plate and then fixedly connecting the connecting beam web plate and the diagonal bracing web plate through strong bolts to finish the erection connection between the precast connecting beam and the first concrete diagonal bracing; and E, when the precast concrete connecting beam is dismantled, the dismantling and recycling of the precast concrete connecting beam can be realized by loosening the strong bolts.
Further, in the step a, reinforcing anchor bars are buried inward of the connecting beam flanges; and C, embedding a counter-pulling reinforcing anchor bar between two counter-supporting flanges at two sides of the first concrete counter-support.
Further, the prefabricated connecting beam is a prefabricated steel connecting beam.
Furthermore, the prefabricated steel connecting beam is an I-shaped steel beam, in the step A, connecting steel plates are arranged at two ends of the I-shaped steel beam, and connecting steel plate bolt holes are formed in the connecting steel plates; in the step C, when a first concrete diagonal brace is cast in place, embedding a steel embedded part in the first concrete diagonal brace, wherein the steel embedded part comprises an embedded anchor plate and diagonal brace embedded bolts, the embedded anchor plate is embedded at the joint of two sides of the first concrete diagonal brace and the I-shaped steel beam, anchor plate bolt holes are formed in the embedded anchor plate, one end of the diagonal brace embedded bolts is an embedded section, the embedded section vertically penetrates through the anchor plate bolt holes and is welded with the anchor plate bolt holes, the embedded section is embedded in the first concrete diagonal brace, the other end of the diagonal brace embedded bolts is a exposed wire section, and the exposed wire section vertically penetrates out of the first concrete diagonal brace; in the step D, when the I-shaped steel beam is erected, the wire exposing section of the oppositely-supported embedded bolt penetrates through the bolt hole of the connecting steel plate and is locked by a high-strength nut to fixedly connect the I-shaped steel beam and the first concrete oppositely-supported beam; and E, when the I-shaped steel beam is dismantled, loosening the locking of the high-strength nut on the oppositely-supported embedded bolts to realize the dismantling and recycling of the I-shaped steel beam.
Further, in the step a, the i-shaped steel beam is formed by welding section steel or steel plates in a combined manner.
The invention has the beneficial effects that:
the construction method of the invention is adopted to connect the prefabricated connecting beam with the cast-in-place concrete counter-support of the strip foundation pit, the internal force of the connecting beam can be effectively transmitted through the connecting structure, and meanwhile, the restraining effect on the cast-in-place concrete counter-support and the effect of strengthening the integrity of the first supporting structure are realized on the premise of meeting the requirements of components in manufacturing, transportation, installation and the like. The stress state of the concrete counter support can be simplified and tends to theoretical analysis, and the rapid installation in site construction is facilitated. Meanwhile, the assembly of the prefabricated parts reduces the workload of later chiseling, realizes the recycling of the prefabricated connecting beam, improves the production efficiency, is green, environment-friendly, energy-saving and emission-reducing, is particularly suitable for the strip foundation pit in a soft soil area, effectively expands the construction means of underground engineering, promotes the technical progress of the industry, and has good economic and social benefits.
Drawings
Fig. 1 is a schematic view of the overall structure of a prefabricated connecting beam in embodiment 1 of the present invention after erection.
Fig. 2 is a schematic sectional view showing a detachable connection structure between a cast-in-place concrete diagonal member and a prefabricated connecting beam in embodiment 1 of the present invention.
Fig. 3 is a schematic top view of a detachable connection structure between a cast-in-place concrete counter-support and a prefabricated tie beam in embodiment 1 of the invention.
Fig. 4 is a schematic view of the overall structure of the prefabricated connecting beam in embodiment 2 of the present invention after erection.
Fig. 5 is a schematic sectional view showing a detachable connection structure between a cast-in-place concrete diagonal member and a prefabricated connecting beam in embodiment 2 of the present invention.
Fig. 6 is a schematic top view of a detachable connection structure between a cast-in-place concrete counter-support and a prefabricated tie beam in embodiment 2 of the invention.
Fig. 7 is a schematic view of the overall structure of a prefabricated connecting beam in embodiment 3 of the present invention after erection.
Fig. 8 is a schematic sectional view showing a detachable connection structure between a cast-in-place concrete diagonal member and a precast tie beam in embodiment 3 of the present invention.
3 fig. 3 9 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 3 8 3. 3
In the figure, 1, a first concrete opposite support is arranged; 11 pairs of supporting flanges; 12 pairs of supporting webs; 13 oppositely pulling the reinforcing anchor bars; 14, embedding an anchor plate; 141 anchor plate bolt holes; 15 pairs of supporting embedded bolts; 16, picking ears; 161 picking ears and embedding bolts; 162 an anchor plate; 2, prefabricating a connecting beam; 21 bolt insertion holes; 22-hole edge reinforcing ribs; 23 connecting beam flanges; 24 connecting the beam web; 241 bolt holes; 25 reinforcing anchor bars; 26 connecting steel plates; 261 connecting steel plate bolt holes; 27 cement mortar; 3, a detachable connecting structure; 4, filling a polystyrene board layer; 5, a strong bolt; 6, high-strength nuts; 7, a foundation pit enclosure structure; 8, pouring concrete on site to enclose purlin; 9, standing pile; 10 temporary steel studs.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Example 1
As shown in fig. 1 to 3, the construction method of the strip foundation pit cast-in-place concrete counter-bracing precast connecting beam, in which the precast connecting beam in this embodiment is a precast concrete connecting beam, includes the following steps:
A. factory prefabrication of the connecting beam 2: the length of the precast concrete connecting beam 2 is 8-9m, the precast concrete connecting beam 2 with the length of 10 grades is precast in batches in a factory by taking 0.1m for each increment as a grade, two ends of the precast concrete connecting beam 2 are provided with through bolt insertion holes 21, and hole edge reinforcing ribs 22 are embedded around the bolt insertion holes 21.
B. Constructing a foundation pit enclosure structure 7, a vertical column pile 9 and a temporary steel vertical column 10;
the retaining structure of the foundation pit, i.e. the retaining and water retaining structure required by the excavation of the foundation pit, is generally selected from the forms of an underground continuous wall, a bored pile, a bored secant pile or a section steel cement soil mixing wall (TRD or SMW construction method pile) and the like according to the excavation depth, geological conditions, the surrounding environment and other factors. The temporary steel upright is a temporary vertical supporting member for supporting the self weight of the concrete support, and is generally a steel lattice column, an H-shaped steel column or a steel pipe column. The upright pile is a foundation member, and generally can be a cast-in-situ bored pile, a manual hole digging pile, a drilling club-footed pile and the like. The construction of the above structure is the prior art, and is not described herein again.
C. The concrete enclosing purlin 8 and the first concrete diagonal brace 1 are constructed in a cast-in-place mode, when the first concrete diagonal brace 1 is cast in place, a picking lug 16 is arranged at the connecting position of the bottoms of the two sides of the first concrete diagonal brace 1 and a precast concrete connecting beam, the picking lug 16 is perpendicular to the first concrete diagonal brace 1, a picking lug embedded bolt 161 is arranged in the picking lug 16, the lower portion of the picking lug embedded bolt 161 is vertically embedded in the picking lug 16, an anchoring plate 162 is arranged below the bottom end of the picking lug embedded bolt 161, and the upper portion of the picking lug embedded bolt 161 penetrates out of the picking lug 16;
D. erecting a precast concrete connecting beam 2 between the first concrete diagonal bracing 1: selecting the precast concrete connecting beam 2 with the corresponding length grade according to the distance between the first concrete counter-support 1, hoisting the precast concrete connecting beam 2 after the first concrete counter-support 1 reaches the design strength, respectively erecting and placing two ends of the precast concrete connecting beam 2 on the lug 16 of the two cast-in-place first concrete counter-supports, enabling the upper part of the lug embedded bolt 161 to penetrate through the bolt insertion hole 21, then filling and jacking the gap between the two ends of the precast concrete connecting beam 2 and the first cast-in-place concrete counter-support 1 through the polystyrene board filling layer 4, pouring cement mortar 27 along the bolt insertion hole 21 until grout is released, and completing the erection and connection between the precast concrete connecting beam 2 and the first concrete counter-support 1 after the cement mortar 27 reaches the strength.
The whole structure of the prefabricated concrete connecting beam 2 after erection is shown in figure 1.
E. Dismantling and recycling the precast concrete connecting beam: after the main structure construction of the first concrete under the support 1 is completed and the design strength is reached, the precast concrete connecting beam 2 is dismantled, upward lifting force is uniformly applied to the precast concrete connecting beam 2, the precast concrete connecting beam 2 is lifted away from the lifting lug 16, and then the dismantling and recycling of the precast concrete connecting beam can be realized, and the first supporting system is dismantled.
Example 2
As shown in fig. 4 to 6, the construction method of the strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam, in which the prefabricated connecting beam in this embodiment is a prefabricated concrete connecting beam, includes the following steps:
A. and (3) prefabricating the concrete connecting beam 2 in a factory: the length of the precast concrete connecting beam 2 is 8-9m, the precast concrete connecting beam 2 with the length of 10 grades is precast in batches in a factory by taking 0.1m as each grade, connecting beam T-shaped embedded parts are embedded at two ends of the precast concrete connecting beam 2, each connecting beam T-shaped embedded part comprises a connecting beam flange 23 and a connecting beam web plate 24 vertically fixed on the connecting beam flange 23, the connecting beam flanges 23 are vertically embedded in two ends of the precast concrete connecting beam 2, and reinforcing anchor bars 25 are embedded inwards of the connecting beam flanges 23; the connecting beam web plate 24 extends out of the precast concrete connecting beam 2, and the connecting beam web plate 24 is provided with a bolt hole 241.
B. Constructing a foundation pit enclosure structure 7, a vertical column pile 9 and a temporary steel vertical column 10;
the retaining structure of the foundation pit, i.e. the retaining and water retaining structure required by the excavation of the foundation pit, is generally selected from the forms of an underground continuous wall, a bored pile, a bored secant pile or a section steel cement soil mixing wall (TRD or SMW construction method pile) and the like according to the excavation depth, geological conditions, the surrounding environment and other factors. The temporary steel upright is a temporary vertical supporting member for supporting the self weight of the concrete support, and is generally a steel lattice column, an H-shaped steel column or a steel pipe column. The upright pile is a foundation member, and generally can be a cast-in-situ bored pile, a manual hole digging pile, a drilling club-footed pile and the like. The construction of the above structure is the prior art, and is not described herein again.
C. The method comprises the following steps that a concrete purlin 8 and a first concrete diagonal brace 1 are constructed in a cast-in-place mode, when the first concrete diagonal brace 1 is cast in place, diagonal T-shaped embedded parts are embedded in the cast-in-place concrete diagonal brace 1, each diagonal T-shaped embedded part comprises a diagonal brace flange 11 and a diagonal brace web plate 12 vertically fixed on the diagonal brace flange 11, the diagonal brace flange 11 is vertically embedded at the position where two sides of the cast-in-place first concrete diagonal brace 1 are connected with a precast concrete connecting beam 2, the diagonal brace web plate 12 extends out of the first concrete diagonal brace 1, and bolt holes 241 are formed in the diagonal brace web plate 12; and a counter-pulling reinforcing anchor bar 13 is buried between two counter-supporting flanges 11 at two sides of the cast-in-situ first concrete counter-support 1.
D. Erecting a precast concrete connecting beam 2 between the first concrete diagonal bracing 1: the precast concrete connecting beam 2 with the corresponding length grade is selected according to the distance between the first concrete pair support 1, the precast concrete connecting beam 2 is hoisted after the first concrete pair support 1 reaches the design strength, the connecting beam web plate 24 is aligned with the bolt hole 241 on the pair support web plate 12 and then fixedly connected through the strong bolt 5, and the erection connection between the precast concrete connecting beam 2 and the first concrete pair support 1 is completed.
The overall structure of the prefabricated connecting beam 2 in the embodiment after erection is shown in fig. 4.
E. Dismantling and recycling the precast concrete connecting beam: after the main structure construction of the first concrete pair support 1 is completed and the design strength is reached, the precast concrete connecting beam 2 is dismantled, and the dismantling and recycling of the precast concrete connecting beam can be realized by loosening the strong bolts 5.
Example 3
As shown in fig. 7-9, the construction method of the strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam, in this embodiment, the prefabricated connecting beam is a prefabricated steel connecting beam, and includes the following steps:
A. prefabricating the steel connecting beam 2 in a factory: the length of the prefabricated steel connecting beam 2 is 8-9m, the prefabricated steel connecting beam 2 with the length of 10 grades is prefabricated in a factory batch by taking 0.1m added as one grade, in the embodiment, the prefabricated steel connecting beam is an I-shaped steel beam 2, connecting steel plates 26 are arranged at two ends of the I-shaped steel beam 2, connecting steel plate bolt holes 261 are formed in the connecting steel plates 26, and the arrangement of the steel plate bolt holes 261 corresponds to the arrangement of the oppositely-supported embedded bolts 15; the i-shaped steel beam 2 can be formed by combining and welding profile steels or steel plates, and in the embodiment, the i-shaped steel beam 2 is formed by combining and welding steel plates.
B. Constructing a foundation pit enclosure structure 7, a vertical column pile 9 and a temporary steel vertical column 10;
the retaining structure of the foundation pit, i.e. the retaining and water retaining structure required by the excavation of the foundation pit, is generally selected from the forms of an underground continuous wall, a bored pile, a bored secant pile or a section steel cement soil mixing wall (TRD or SMW construction method pile) and the like according to the excavation depth, geological conditions, the surrounding environment and other factors. The temporary steel upright is a temporary vertical supporting member for supporting the self weight of the concrete support, and is generally a steel lattice column, an H-shaped steel column or a steel pipe column. The upright pile is a foundation member, and generally can be a cast-in-situ bored pile, a manual hole digging pile, a drilling club-footed pile and the like. The construction of the above structure is the prior art, and is not described herein again.
C. The cast-in-place construction concrete purlin 8 and the first concrete diagonal brace 1, when the cast-in-place first concrete diagonal brace 1 is adopted, a steel embedded part is embedded in the cast-in-place concrete diagonal brace 1, the steel embedded part comprises an embedded anchor plate 14 and diagonal brace embedded bolts 15, the embedded anchor plate 14 is embedded at the joint of the two sides of the first concrete diagonal brace 1 and the I-shaped steel beam 2, anchor plate bolt holes 141 are formed in the embedded anchor plate 14, one ends of the diagonal brace embedded bolts 15 are embedded sections, the embedded sections vertically penetrate through the anchor plate bolt holes 141 and are welded with the anchor plate bolt holes 141, the embedded sections are embedded in the first concrete diagonal brace 1, the other ends of the diagonal brace embedded bolts 15 are exposed sections, and the exposed sections vertically penetrate out of the first concrete diagonal brace 1.
D. Erecting an I-shaped steel beam 2 between the first concrete diagonal bracing 1: according to the I-shaped steel beam 2 that the interval between the first concrete pair prop 1 selected corresponding length shelves, wait that the first concrete pair prop 1 and hoist I-shaped steel beam 2 after reaching design intensity, will wear to locate in the connecting plate bolt hole 261 and through the locking of high-strength nut 6 with I-shaped steel beam 2 and first concrete pair prop 1 fixed connection to propping the exposed section of embedded bolt 15.
The overall structure of the erected i-beam 2 in this embodiment is shown in fig. 7.
E. Dismantling and recycling the I-shaped steel beam: after the construction of the main body structure of the first concrete under the support 1 is completed and the design strength is reached, the I-shaped steel beam 2 is dismantled, and the locking of the high-strength nut 6 on the support embedded bolt 15 is released, so that the dismantling and recycling of the I-shaped steel beam 2 can be realized.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (6)

1. The construction method of the strip foundation pit cast-in-place concrete oppositely-supported precast connecting beam is characterized in that the precast connecting beam is a precast concrete connecting beam or a precast steel connecting beam, and comprises the following steps:
A. prefabricating a connecting beam in a factory: the length of the prefabricated connecting beam is 8-9m, the prefabricated connecting beam with the length of 10 grades is prefabricated in a factory in batches by adding 0.1m as one grade, detachable connecting structures fixedly connected with cast-in-place concrete counter supports are arranged at two ends of the prefabricated connecting beam, and penetrating bolt insertion holes are arranged at two ends of the prefabricated concrete connecting beam;
B. constructing a foundation pit enclosure structure, a vertical column pile and a temporary steel vertical column;
C. b, performing cast-in-place construction on a concrete purlin and a first concrete diagonal brace, arranging a detachable connecting structure matched with the prefabricated connecting beam in the step A at the connecting part of the first concrete diagonal brace and the prefabricated connecting beam, and when performing the cast-in-place construction on the first concrete diagonal brace, arranging picking lugs at the connecting parts of the bottoms of the two sides of the first concrete diagonal brace and the prefabricated connecting beam, wherein the picking lugs are perpendicular to the first concrete diagonal brace, picking lug embedded bolts are arranged in the picking lugs, the lower parts of the picking lug embedded bolts are vertically embedded in the picking lugs, anchoring plates are arranged below the bottom ends of the picking lug embedded bolts, and the upper parts of the picking lug embedded bolts penetrate out of the picking lugs;
D. erecting a prefabricated connecting beam between the first concrete opposite supports: selecting the precast connecting beams with corresponding length grades according to the space between the first concrete diagonal braces, hoisting the precast connecting beams after the first concrete diagonal braces reach the design strength, completing the erection and connection between the precast connecting beams and the first concrete diagonal braces, when erecting the precast concrete connecting beams, two ends of the precast concrete connecting beam are respectively erected and placed on the lifting lugs of the two first concrete opposite supports, so that the upper parts of the lifting lug embedded bolts penetrate through the bolt insertion holes, then the gaps between the two ends of the precast concrete connecting beam and the first concrete opposite support are tightly filled and jacked through a polystyrene board filling layer, cement mortar is poured along the bolt insertion holes until grout is emitted, and after the cement mortar reaches the strength, the erection and connection between the precast concrete connecting beam and the first concrete opposite support are completed;
E. dismantling and recycling the prefabricated connecting beam: and after the construction of the main body structure of the first concrete pair support is completed and the design strength is reached, dismantling the prefabricated connecting beam for recycling, dismantling the first support system, and when the prefabricated concrete connecting beam is dismantled, uniformly applying upward lifting force to the prefabricated concrete connecting beam to lift the prefabricated concrete connecting beam away from the picking lug, so that the dismantling and recycling of the prefabricated concrete connecting beam can be realized.
2. The construction method of the strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam according to claim 1, wherein in the step A, hole-edge reinforcing ribs are further embedded around the bolt insertion holes.
3. The construction method for the strip foundation pit cast-in-place concrete oppositely-supported precast connecting beam according to claim 1, wherein in the step A, T-shaped embedded parts of the connecting beam are embedded at two ends of the precast concrete connecting beam, each T-shaped embedded part of the connecting beam comprises a connecting beam flange and a connecting beam web plate vertically fixed on the connecting beam flange, the connecting beam flanges are vertically embedded in two ends of the precast concrete connecting beam, the connecting beam web plates extend out of the precast concrete connecting beam, and bolt holes are formed in the connecting beam web plates; in the step C, when a first concrete counter-support is cast in place, a counter-support T-shaped embedded part is embedded in the first concrete counter-support, the counter-support T-shaped embedded part comprises counter-support flanges and counter-support webs vertically fixed on the counter-support flanges, the counter-support flanges are vertically embedded at the connection positions of two sides of the first concrete counter-support and the precast concrete connecting beam, the counter-support webs extend out of the first concrete counter-support, and bolt holes are formed in the counter-support webs; in the step D, when the precast concrete connecting beam is erected, aligning bolt holes on a connecting beam web plate and a diagonal bracing web plate and then fixedly connecting the connecting beam web plate and the diagonal bracing web plate through strong bolts to finish the erection connection between the precast connecting beam and the first concrete diagonal bracing; and E, when the precast concrete connecting beam is dismantled, the dismantling and recycling of the precast concrete connecting beam can be realized by loosening the strong bolts.
4. The construction method for the strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam according to claim 3, wherein in the step A, reinforcing anchor bars are buried on the inner side of the connecting beam flange; and C, embedding a counter-pulling reinforcing anchor bar between two counter-supporting flanges at two sides of the first concrete counter-support.
5. The construction method for the strip foundation pit cast-in-place concrete diagonal bracing prefabricated connecting beam according to claim 1, wherein the prefabricated steel connecting beam is an I-shaped steel beam, in the step A, connecting steel plates are arranged at two ends of the I-shaped steel beam, and connecting steel plate bolt holes are formed in the connecting steel plates; in the step C, when a first concrete diagonal brace is cast in place, embedding a steel embedded part in the first concrete diagonal brace, wherein the steel embedded part comprises an embedded anchor plate and diagonal brace embedded bolts, the embedded anchor plate is embedded at the joint of two sides of the first concrete diagonal brace and the I-shaped steel beam, anchor plate bolt holes are formed in the embedded anchor plate, one end of the diagonal brace embedded bolts is an embedded section, the embedded section vertically penetrates through the anchor plate bolt holes and is welded with the anchor plate bolt holes, the embedded section is embedded in the first concrete diagonal brace, the other end of the diagonal brace embedded bolts is a exposed wire section, and the exposed wire section vertically penetrates out of the first concrete diagonal brace; in the step D, when the I-shaped steel beam is erected, the wire exposing section of the oppositely-supported embedded bolt penetrates through the bolt hole of the connecting steel plate and is locked by a high-strength nut to fixedly connect the I-shaped steel beam and the first concrete oppositely-supported beam; and E, when the I-shaped steel beam is dismantled, loosening the locking of the high-strength nut on the oppositely-supported embedded bolts to realize the dismantling and recycling of the I-shaped steel beam.
6. The construction method of the strip foundation pit cast-in-place concrete oppositely-supported and prefabricated connecting beam as claimed in claim 5, wherein in the step A, the I-shaped steel beam is formed by welding section steel or a combination of steel plates.
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